Answer:
specular reflection reflects all light which arrives from a given direction at the same angles where diffus reflection reflects light in a broad range of direction
You have twenty ml of a 90 mmol/liter solution of glucose. if you add forty ml of water, the concentration of glucose in the new solution will be:_____.
The concentration of glucose in the new solution will be
30 M mol/liter.
Subtract the solute's mass from the total volume of the solution. Using m as the solute's mass and V as the total volume of the solution, write out the equation C = m/V.
A concentrated solution is referred to as a stock solution since it will be diluted to a lesser concentration before usage. M₁V₁ = M₂V₂ is the dilution equation.
A diluted solution = stock solution.
M₁ is the stock solution's molarity.
M₂ stands for the diluted solution's molarity.
V1 is the volume of the starting solution.
V2 is the volume of the final solution.
M₁ = 90M mol/liter
V₁ = 20mL
V₂ = 40mL
Using the formula,
M₁V₁ = M₂V₂
20mL × 90 M mol/liter = 40mL × M₂
M₂ = 30 M mol/liter
Therefore, the concentration of glucose in the new solution will be
30 M mol/liter.
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Drag each tile to the correct location. classify the chemical equations as being balanced or not balanced. 2co 2no → 2co2 n2 6co2 6h2o → c6h12o6 o2 h2co3 → h2o co2 2cu o2 → cuo
A. 2CO + 2NO → 2CO2 + N2 is a balanced equation as the number of carbon, oxygen, and nitrogen atoms are same on both sides.
B. 6CO2 + 6H2O → C6H12O6 + O2 is an imbalanced equation as oxygen atoms are not balanced here.
C. H2CO3 → H2O + CO2 is a balanced equation as same number of hydrogen, carbon, and oxygen are present on both sides.
D. 2Cu + O2 → CuO is an imbalanced equation as both copper and oxygen are imbalanced here.
What is Chemical equation ?A chemical equation is a way to depict a chemical reaction using the symbols and formulas of the components involved. For instance, when zinc metal and diluted sulfuric acid combine, zinc sulphate and hydrogen gas are produced.
Balanced and imbalanced chemical equation -
an equation in chemistry where the number of each sort of atom is equal on both sides. Subscripts are a component of the chemical formulae for the reactants and products that show how many atoms of the previous element there are in each.
The chemical equation is referred to as being imbalanced if the number of atoms of each element present in the reactants and the number of atoms of each element present in the product are not equal.
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Answer: A. 2CO + 2NO → 2CO2 + N2 is a balanced equation as the number of carbon, oxygen, and nitrogen atoms are same on both sides.
B. 6CO2 + 6H2O → C6H12O6 + O2 is an imbalanced equation as oxygen atoms are not balanced here.
C. H2CO3 → H2O + CO2 is a balanced equation as same number of hydrogen, carbon, and oxygen are present on both sides.
D. 2Cu + O2 → CuO is an imbalanced equation as both copper and oxygen are imbalanced here.
What is Chemical equation ?
A chemical equation is a way to depict a chemical reaction using the symbols and formulas of the components involved. For instance, when zinc metal and diluted sulfuric acid combine, zinc sulphate and hydrogen gas are produced.
Balanced and imbalanced chemical equation -
an equation in chemistry where the number of each sort of atom is equal on both sides. Subscripts are a component of the chemical formulae for the reactants and products that show how many atoms of the previous element there are in each.
The chemical equation is referred to as being imbalanced if the number of atoms of each element present in the reactants and the number of atoms of each element present in the product are not equal.
Explanation:
What chemical process is responsible for the smell of vinegar in an old bottle of aspirin?
Chemical process is responsible for the smell of vinegar in an old bottle of aspirin is Hydrolysis of ester i.e. Aspirin.
Aspirin reacts with water leading to the formation of Acetic acid which is a Carboxylic acid derivative.
Aspirin on Hydrolysis forms Acetic acid and Salicylic acid.
The reaction shows up as a fizz when aspirin is added in water.
Aspirin is called Acetyl Salicylic acid and it helps to reduce:
InflammationPainFeverHeadacheArthritisMuscle painTooth painAcetic acid or Ethanoic acid is a colorless liquid. It is an important carboxylic acid. It smells like vinegar.
Acetic acid is used for production of following:
Vinyl AcetateInsecticidesRubberAcetic anhydrideSalicylic acid is a bitter compound which is colorless. It reduces acne and opens up the skin pores.
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What type of bond connects the fatty acid?
a. phosphate bond
b. amide bond
c. an ester bond
d. an amino bond
The type of bond connects the fatty acid will be " an ester bond".
Fatty acids could be joined to each of the three carbons of the glycerol molecule in a fat molecule by an ester bond that passes through into the oxygen atom. Three molecules are emitted during the establishment of the ester bond. Fats were also known as triacylglycerols as well as triglycerides because they are made consisting of three fatty acids and glycerol.
The three major nutrients in a diet may be carbohydrates, proteins, and fats. According to how many hydrogen bonds they contain, fats are classified as either saturated as well as unsaturated.
The type of bond connects the fatty acid will be " an ester bond".
Hence, the correct answer will be option (c)
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The best way to differentiate chart elements is by using _____.
i. colors
b. labels
c. bubbles chart
d. titles
The best way to differentiate chart elements is by using labels.
So, option B is correct one.
The table should be used when
The reader needs to refer to specific numerical values.The reader needs to make precise comparison between different values and not just relative comparisons.The values being displayed have different displayed have different units or very different magnitudes.The column chart is probably the most used chart type. This chart best used to compare different values when specific values are important.
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Strontium-89 undergoes beta decay, after 88 days a sample has decreased to 30% its original size. What is the half-life of sr-89?.
The half-life of sr-89 will be 51 days.
What is a Beta decay?In nuclear physics, beta decay is a type of radioactive decay in which an atomic nucleus emits a beta particle (a fast energetic electron or positron), which changes the original nuclide into an isobar of that nuclide. Prior to beta decay, neither the beta particle nor the associated (anti-)neutrino is present in the nucleus; instead, they are produced during the decay process. This procedure gives unstable atoms a protons-to-neutrons ratio that is more stable.The weak force, which is characterized by relatively slow decay durations, results in beta decay. Up and down quarks make up nucleons, and the weak force allows a quark to change the flavor of its lepton by emitting a W boson, which produces an electron/antineutrino or positron/neutrino pair.For instance, the disintegration of a neutron, which consists of two down quarks and an up quark, produces a proton, which consists of a down quark and two up quarks.Because the fundamental nuclear mechanism, mediated by the weak force, is the same, electron capture is occasionally considered a kind of beta decay. In electron capture, a proton in the nucleus captures an inner atomic electron, turning it into a neutron, and releasing an electron neutrino.To learn more about beta decay strontium-89 click here-
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What is the molecular geometry if you have 4 single bonds around the central atom?
Tetrahedral geometry is the molecular geometry if you have 4 single bonds around the central atom.
In a tetrahedral molecular geometry, a central atom is located at the centre with four substituents that are located at the corners of a tetrahedron. The bond angles are cos−1(−1⁄3) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH4) as well as its heavier analogues. Methane and other perfectly symmetrical tetrahedral molecules belong to point group Td, but most tetrahedral molecules have lower symmetry. Tetrahedral molecules can be chiral.
The five basic shapes of hybridization are linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral. The geometry of the orbital arrangement: Linear: Two electron groups are involved resulting in sp hybridization, the angle between the orbitals is 180°.
Redistribution of the energy of orbitals of individual atoms to give orbitals of equivalent energy happens when two atomic orbitals combine to form a hybrid orbital in a molecule. This process is called hybridization. During the process of hybridization, the atomic orbitals of comparable energies are mixed together and mostly involves the merging of two ‘s’ orbitals or two ‘p’ orbitals or mixing of an ‘s’ orbital with a ‘p’ orbital as well as ‘s’ orbital with a ‘d’ orbital. The new orbitals thus formed are known as hybrid orbitals. More significantly, hybrid orbitals are quite useful in explaining atomic bonding properties and molecular geometry.
Key Features of Hybridization :
Atomic orbitals with equal energies undergo hybridization.The number of hybrid orbitals formed is equal to the number of atomic orbitals mixing.It is not necessary that all the half-filled orbitals must participate in hybridization. Even completely filled orbitals with slightly different energies can also participate.Hybridization happens only during the bond formation and not in an isolated gaseous atom.The shape of the molecule can be predicted if the hybridization of the molecule is known.The bigger lobe of the hybrid orbital always has a positive sign, while the smaller lobe on the opposite side has a negative sign.Learn more about tetrahedral molecular geometry here : https://brainly.com/question/20274710
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Solutions having osmotic pressures less than those of body fluids are called group of answer choices isosmotic. hyperosmotic. hyposmotic. neosmotic. magnosmotic
The solutions having osmotic pressure less than those of body fluids are called as hypoosmotic , therefore option C is correct.
What is osmotic pressure?Osmotic pressure is defined as the pressure that would be required to stop water from diffusing through a barrier by osmosis.
It is essentially a colligative feature that completely depends on the solute particle concentration in the solution.
Higher concentrations and higher temperatures increase osmotic pressure.
Osmotic pressure can be calculated using the following equation:
Π = MRT
where,
Π=osmotic pressure
M=Molar concentration of solution
R=Real gas constant
T=Temperature in Kelvin
Solutions having osmotic pressure less than those of body fluids are called as hypoosmotic solutions ,hence option C is correct.
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What is the molar mass of aluminum sulfate? 278.0 g/mol 315.2 g/mol 306.2 g/mol 123.0 g/mol 342.2 g/mol
The molar mass of aluminum sulfate is 342.2 g/mol.
The molar mass of aluminium sulfate Al₂(SO₄)₃, will be equal to the sum of the molar masses of all the atoms that make up a mole of this compound.
From (Al₂(SO₄)₃, 1 mole of aluminum sulfate contains;
two moles of aluminum, 2xAl
three moles of sulfur, 3xS
twelve moles of oxygen, 3x4x0
From periodic table, the molar mass of aluminum, sulfur and oxygen is;
Al= 26.981538 g mol⁻¹
S= 32.065 g mol⁻¹
O=14.9994 g mol⁻¹
To find molar mass of aluminum sulfate we need to do
2xMmAl+3xMmS+12XMmO
2X26.981538 g mol⁻¹+3X32.065 g mol⁻¹+12X15.9994 g mol⁻¹
This will give Mm Al₂(SO₄)₃ = 342.150876 g mol⁻¹
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In what type of bonds do atoms join together because their opposite charges attract each other?
O metallic bonds and ionic bonds
O metallic bonds and covalent bonds
O ionic bonds and hydrogen bonds
O ionic bonds and covalent bonds
I am guessing ionic and hydrogen bonds (C), but can someone confirm? Thanks!
[tex]\leadsto[/tex] In what type of bonds do atoms join together because their opposite charges attract each other?
O metallic bonds and ionic bonds
O metallic bonds and covalent bonds
● Ionic bonds and hydrogen bonds ✓
O ionic bonds and covalent bonds
Explanation:During bonding, the metals tend to lose electrons while the non-metals gain electrons. These ions with opposite charges will attract one another, creating an ionic bond. Similarly, for hydrogen, it is a weak bond that occurs due to the electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
The type of bond in which atoms join together because their opposite charges attract each other is ionic bonds and hydrogen bonds. The correct option is C.
What are ionic and hydrogen bonds?Ionic bonds are those bonds that are formed by the difference in the electrostatic charge between the molecules. Ex; sodium chloride.
Hydrogen bonds are formed between the hydrogen atom and the atom that are more electronegative than hydrogen.
Metals typically lose electrons during bonding, whereas non-metals typically gain electrons. These ions will be drawn to one another by their opposing charges, forming an ionic connection.
Similar to this, the electrostatic attraction between a proton in one molecule and an electronegative atom in the other results in a weak link for hydrogen.
Thus, the correct option is C, ionic bonds, and hydrogen bonds.
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If an atom were scaled up to the size of a sports arena, the space filled by the positive charges inside the atom (according to the work of ernest rutherford early in this century) would be:______.
If an atom were scaled up to the size of a sports arena, the space filled by the positive charges inside the atom (according to the work of ernest Rutherford early in this century) would be very small (perhaps size of the soccer ball).
A classical atoms based on Rutherford's model is doomed to collapse. An atom has highly non-uniform mass distribution in Rutherford's model.The positively charges part of the atom possess most of the mass in Rutherford's model. The positive charge and most of the mass of the atom were densely concentrated in extremely small region . This small region is called nucleus according Rutherford's model.
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Can someone help me create energy diagrams for these three reactions?
The energy diagrams of the synthesis, single replacement, and double replacement reactions are found in the attached image.
What are energy profile diagrams?Energy profile diagrams are diagrams which illustrate the potential energy changes that occur when reactant molecule combine to form products.
The energy diagrams shows the potential energy of the reaction, the energy of the transition state of the reaction, the activation energy of the reaction, as well as the potential energy of the products.
From energy diagrams, the enthalpy change of a reaction can be determined. Also, it can also be established whether the reaction is exothermic or endothermic.
For exothermic reactions, the enthalpy change is negative since the potential energy of the reactants is greater than the potential energy of the products.
For endothermic reactions, the enthalpy change is positive since the potential energy of the reactants is less than the potential energy of the products.
Based on this therefore, the energy diagrams of the given reactions have been constructed and are found in the attached image.
In conclusion, energy diagrams are used to show energy changes occurring in a reaction.
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Balance the equation in acidic conditions. phases are optional. equation: cu no_{3}^{-} -> cu^{2 } no cu no−3⟶cu2 no
Cu + 2NO₃⁻ + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now write the given equation
Cu + NO₃⁻ → Cu⁺² + NO₂
Here we can see that all atoms other than O and H are balanced.
In the given equation oxidation number of Cu changes from 0 to +2.
In the given equation oxidation number of N changes from 5 to 4.
Now multiply by 2 with NO₃⁻ and NO₂.
Cu + 2NO₃⁻ → Cu⁺² + 2NO₂
Now ad the water molecules in right hand side to balanced the O atoms.
Cu + 2NO₃⁻ → Cu⁺² + 2NO₂ + 2H₂O
Now add 4H⁺ on the left hand side to balance the H atoms.
Cu + 2NO₃⁻ + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O
Thus from the above conclusion we can say that Cu + 2NO₃⁻ + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.
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550. ml of a 0. 40m solution of naoh is titrated with 0. 25 m hcl. calculate the ph of the solution after 650. ml of the hcl has been added
Titration is the determination of quantity by a known amount. The pH of the solution after the solution was added with 650 mL of hydrochloric acid is 13.4.
What is pH?pH is the calculation of the hydrogen ion concentration in the solution and can be used to determine the acidity or the basicity of the solution.
Given,
M₁ = 0.40 M
V₁ = 550 mL
M₂ = 0.25 M
V₂ =?
Volume at 0.25 M is calculated as,
M₁V₁ = M₂V₂
0.40 × 550.0 =0.25 × V2
V2 = 880 ml
880 mL of HCl is required for the neutralization reaction.
The final molar concentration of NaOH is,
550 × M₁ = 0.25 × 650
M₁ = 0.295 M
pH is calculated as:
pOH = -log [OH⁻]
= -log [0.295]
= 0.529
Solving further,
pH+ pOH = 14
pH = 14 - pOH
= 14 - 0.529
= 13.4
Therefore, 13.4 is the pH of the solution.
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What is the pH of a 1.00 M aqueous solution of a weak diprotic acid H2Y if its Ka1 is equal to 6.9x10-5 and Ka2 is equal to 5.4x10-12
The pH of the diprotic acid H2Y is =
6.15 × 10-17
Calculation of pHA diprotic acid is a type of acid that contains two hydrogen atoms in its molecules which has the ability to be replaced when involved in a chemical reaction.
A weak diprotic acid is the type of acid that yields hydronium ions and bicarbonate ions in small amounts when involved in a chemical reaction.
The pH is defined as the degree of how acidic or how basic a substance is when measured against a scale.
The Ka1 of the weak diprotic acid = 6.9x10-5
The Ka2 of the weak diprotic acid = 5.4x10-12
Using the formula;
pH = (pKa1 + pKa2)/2
pH = (6.9x10-5 + 5.4x10-12)/2
pH= 12.3 ×10-5×10-12
pH= 12.3 × 10-17/2
pH= 6.15 × 10-17
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Which best explains why the trend in noble gas boiling points increases down the group?.
The atoms become larger, the intermolecular forces between the atoms become stronger and more energy is needed to overcome these forces. Hence, the boiling point of noble gases increases down the group.
What are noble gases?
Group 18 of the modern periodic table consists of noble gases. Helium, neon, argon, krypton, xenon, and radon are noble gases. These gases are monoatomic and chemically inert under normal conditions and because of this they are also called inert gases. These gases are present in very small quantities in the atmosphere, and so they are also called rare gases.Trends in Physical Properties of Noble Gases:
Atomic Radii (Atomic size): As we move down the group from helium to radon the atomic size of Noble Gasses keeps on increasing. This is because when going down the group, the number of occupied shells with valence electrons increases.Boiling and Melting Points: As we move down the group, the boiling and melting point of the Noble Gasses increases due to the following reason:When moving down in the group, the atomic radius increases which results in the formation of a strong Van Der Waals force of attraction between the atoms.As to overcome the interatomic force of attraction which becomes stronger, it also requires more energy during melting and boiling.Density: All elements of group 18 have low densities. When going down the group, density increases as the atomic mass keeps on increasing.Ionization Energy: In the periodic table, As we move down the group the first ionization energy keeps on decreasing.Ionization Potential: When going down the group, the atomic radii increases which increases the attractive force and ultimately results in the increase of polarity and decrease in the ionization potential. This is because the larger atom of the group in the valence electrons are held together less tightly by the atom as they are situated far away from the nucleus.To learn more about trends in noble gases:
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Consider a 0.12 M solution of a weak polyprotic acid (H2A) with the possible values of Ka1 and Ka2 given here. Calculate the contributions to [H3O+] from each ionization step. At what point can the contribution of the second step be neglected?
A. Ka1=1.0×10−4 and Ka2=5.0×10−5
The [H3O+] in step 1 is 0.0034 M while the [H3O+] in step 2 is 0.00039 M
What is the contribution of each step?Let us set up the ICE table in each case, for K1;
H2A(aq) + H2O(l)--------> H3O^+(aq) + HA^-(aq)
I 0.12 0 0
C -x +x +x
E 0.12 - x x x
Ka1= [H3O^+] [HA^-]/[ H2A]
Ka1= x^2/ 0.12 - x
1.0×10^−4 = x^2/ 0.12 - x
1.0×10^−4(0.12 - x ) = x^2
1.2 * 10^-5 - 1.0×10^−4x = x^2
x^2 + 1.0×10^−4x - 1.2 * 10^-5 = 0
x =0.0034 M
[H3O+] = 0.0034 M
Again; [H3O+] = [HA^-] = 0.0034 M
HA^-(aq) + H20(l) -------> A^-(aq) + H3O^+
I 0.0034 0 0
C -x + x +x
E 0.0034 - x x x
Ka2= [A^-] [H3O^+]/[HA^-]
5.0×10^−5 = x^2/ 0.0034 - x
5.0×10^−5 (0.0034 - x ) = x^2
1.7 * 10^-7 - 5.0×10^−5x = x^2
x^2 + 5.0×10^−5x - 1.7 * 10^-7 = 0
x=0.00039 M
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Reset the simulation by clicking the reload button at the bottom right corner of the screen. move the chemistry book down again so its surface touches the surface of the physics book. quickly move the chemistry book back and forth. what’s different when the motion is faster?
The temperature of the physics book increasing as the chemistry book slides across it is the difference when motion is faster.
Because the molecules have kinetic energy, molecular motion rises with rising temperature and decreases with falling temperature. At absolute zero, molecular motion comes to a complete standstill.
What is Temperature ?This is defined as the degree of hotness or coldness of a body and it increases when there is more friction.
When motion is faster, there is an increase in friction and increase in thermal(heat) energy which leads to increase in temperature.By increasing the temperature, the velocity of the particles is accelerated. In contrast, lowering the temperature slows down the motion of the particles until it eventually stops entirely at absolute zero (0 K). The particles will have kinetic energy since they are moving.Learn more about Temperature here:
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Answer:
The speed of the particles increases for both books, and the temperature of the physics book increases even more.
Explanation:
edmentum
What would cause the equilibrium to shift left in this reaction? co 3h2 ⇌ ch4 h2o
option (A) Adding heat to the product mixture is the right answer.
As the reactant side has more moles than the product side, the equilibrium of the reaction shifts to the left to decrease pressure by increasing volume.
If the temperature drops, equilibrium also moves to the left.
Given equation is co+ 3h2 ⇌ ch4+ h2o
When heat is added to the product mixture in this situation, equilibrium moves to the left.
What is meant by equilibrium?A condition where opposing forces or actions are in balance is known as equilibrium.
What two types of equilibrium are there?Equilibrium is of two types:
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Potassium reacts with oxygen gas to produce potassium oxide. Determine the percent yield for the reaction between 8.92 grams of potassium and 3.28 grams of oxygen gas if 6.36 grams of potassium oxide are produced?
Answer:
Percent Yield K₂O = 59.2%
Explanation:
Before you can calculate the percent yield, you need to find the theoretical yield. This value is the amount of product produced using the balanced chemical equation and molar masses. However, the question does not specify which reactant is the limiting reagent. Therefore, you have to calculate the mass of the product starting from both values.
To find the theoretical yield, you need to (1) convert grams K/O₂ to moles K/O₂ (via molar masses), then (2) convert moles K/O₂ to moles K₂O (via mole-to-mole ratio from balanced equation coefficients), and then (3) convert moles K₂O to grams K₂O (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given values.
Molar Mass (K): 39.098 g/mol
Molar Mass (O₂): 2(15.998 g/mol)
Molar Mass (O₂): 31.996 g/mol
Molar Mass (K₂O): 2(39.098 g/mol) + 15.998 g/mol
Molar Mass (K₂O): 94.194 g/mol
The balanced equation:
4 K + O₂ -----> 2 K₂O
8.92 g K 1 mole 2 moles K₂O 94.194 g
-------------- x ----------------- x -------------------- x ---------------- = 10.7 g K₂O
39.098 g 4 moles K 1 mole
3.28 g O₂ 1 mole 2 moles K₂O 94.194 g
---------------- x --------------- x --------------------- x -------------- = 19.3 g K₂O
31.996 g 1 mole O₂ 1 mole
Because potassium produces the smaller amount of product, it is the limiting reagent. This means that all the potassium reactant is used up before the oxygen gas runs out. So, the theoretical yield of potassium oxide is 10.7 grams.
Now, you can use the theoretical yield and actual yield to determine the percent yield.
Actual Yield
Percent Yield = ------------------------------ x 100%
Theoretical Yield
6.36 g K₂O
Percent Yield = ------------------------ x 100%
10.7 g K₂O
Percent Yield = 59.2%
7. Which of the following is NOT part of the Kinetic Molecular Theory?
a. All matter came from the Big Bang.
b. Matter is made of small particles called atoms.
c. Atoms are in constant motion.
d. The energy of the atoms is called heat.
) a student makes up a 0. 6 m solution of acetic acid. (note: the pka of acetic acid is 4. 74) a) what is the poh of this solution?
A student makes up a 0. 6 M solution of acetic acid then its pOH of this solution is 13.77
Calculation ,
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
We have to find pH of the acetic acid .
[ [tex]H^{+}[/tex] ] = 0. 6
pH = -㏒[ [tex]H^{+}[/tex] ]
pH = -㏒ [ 0. 6 ]
pH = 0.22
pH + pOH = 14
pOH = 14 - pOH = 14 - 0.22 = 13.77
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Which state of matter is being described below? it can be squashed easily, spreads out slowly, has low density,
Answer:
liquid
Explanation:
Gas has very low density but spreads fast. Solid has high density.
The half-life of tritium (h) is 12 years. How long does it take for 16. 0 ng of tritium to decay to the point where 2. 0 ng remains?
Answer:
36 years
Explanation:
2 = 16 * (1/2)^n where n is the number of half lives
2/16 = (1/2)^n
1/8 = (1/2)^n
log (1/8) = log (1/2^n)
log(1/8) = n log (1/2)
log ( 1/8 ) / log(1/2) = n = 3 half lives
each half life is 12 years so 3 * 12 = 36 years
Why are ionic compounds like NaCl, KCl, CaCl2, PbBr2 (etc.non conductors in the solid state but conductors in aqueous solution?
Explanation:
if its the same compound what happened to make it different?
they were put in water
lot of those compounds have Cl in them making them salts
NaCl is Sodium Chloride which is regular table salt
In water, the sodium atoms and chlorine atoms separate
They move around in the water as positively and negatively charged ions.
This separation of charge allows the solution to conduct electricity.
britannica
What is the celsius temperature of 100. 0 g of chlorine gas in a 55. 0-l container at 800 mm hg?
The Celsius temperature of 100. 0 g of chlorine gas is 227.65 C.
What is temperature?
Temperature is the measurement of the hotness or coldness of a body or substance or place.
Given, that the pressure is P = 800 mm Hg
Converted into pascals 1.066 X 10^5 Pa
The Volume is V = 55 l
Converted into meter cube 0.055 m^3
The number of moles of Cl2 gas will be calculated
weight / molecular weight
100.0 / 71 = 1.408
From the ideal gas equation
PV = nRT
T = PV/RT
where R = universal gas constant = 8.314 J /mol K
Putting the values in the equation:
[tex]T = \dfrac{1.006 \times 10^-5 \times 0.055}{1.408 \times 8.314 } = 500.8 K.[/tex]
T is temperature = 500.8 K
The Celsius temperature is 500.8 K = 227.65 C
Thus, the temperature in Celsius is 227.65 C.
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The process of releasing silver iodide into the atmosphere to stimulate rainfall is called:?
Chem Questions
1) Determine the mass of RbCN required to prepare a 370 mL solution which is 0.12 M RbCN (MW = 112 g/mol).
2) Determine the mass of RbCN required to prepare a 246 mL solution which is 0.12 M RbCN (MW = 112 g/mol).
3) What does a 1-molar solution of CaCl_2 contain?
4) Calculate the empirical formula for a chemical compound that gives the following analysis: 12.6 percent lithium, 29.2 percent sulfur, and 58.2 percent oxygen.
5) Calculate the empirical formula for a chemical compound that gives the following analysis: 65.2 g scandium and 34.8 g oxygen.
1. The mass of RbCN required to prepare the solution is 4.97 g
2. The mass of RbCN required to prepare the solution is 3.31 g
3. 1 molar solution of CaCl₂ contains 1 mole of CaCl₂ in 1 L of the solution
4. The empirical formula of the compound is Li₂SO₄
5. The empirical formula of the compound is Sc₂O₃
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
1. How to determine the mass of RbCN requiredWe'll begin by calculating the mole of RbCN in the solution
Volume = 370 mL = 370 / 1000 = 0.37 L Molarity = 0.12 MMole = ?
Mole = molarity × volume
Mole = 0.12 × 0.37
Mole = 0.0444 mole
Finally, we shall determine the mass of RbCN required as illustrated below
Mole = 0.0444 moleMolar mass = 112 g/molMass of RbCN =?Mass = mole × molar mass
Mass of RbCN = 0.0444 × 112
Mass of RbCN = 4.97 g
2. How to determine the mass of RbCN requiredWe'll begin by calculating the mole of RbCN in the solution
Volume = 246 mL = 246 / 1000 = 0.246 L Molarity = 0.12 MMole = ?
Mole = molarity × volume
Mole = 0.12 × 0.246
Mole = 0.02952 mole
Finally, we shall determine the mass of RbCN required as illustrated below
Mole = 0.02952 moleMolar mass = 112 g/molMass of RbCN =?Mass = mole × molar mass
Mass of RbCN = 0.02952 × 112
Mass of RbCN = 3.31 g
3. What does a molar solution of CaCl₂ contains?This is a solution that contains 1 mole of CaCl₂ in 1 L of the solution
4. How to determine the empirical formulaLi = 12.6%S = 29.2%O = 58.2%Empirical formula =?Divide by their molar mass
Li = 12.6 / 7 = 1.8
S = 29.2 / 32 = 0.9125
O = 58.2 / 16 = 3.6375
Divide by the smallest
Li = 1.8 / 0.9125 = 2
S = 0.9125 / 0.9125 = 1
O = 3.6375 / 0.9125 = 4
Thus, the empirical formula of the compound is Li₂SO₄
5. How to determine the empirical formulaSC = 65.2 gO = 34.8 gEmpirical formula =?Divide by their molar mass
SC = 65.2 / 45 = 1.449
O = 34.8 / 16 = 2.175
Divide by the smallest
SC = 1.449 / 1.449 = 1
O = 2.175 / 1.449 = 3/2
Multiply by 2 to express in whole number
SC = 1 × 2 = 2
O = 3/2 × 2 = 3
Thus, the empirical formula of the compound is Sc₂O₃
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In the reaction below green chlorine gas and brown iodine chloride forms yellow iodine trichloride cl2 (g) icl (l) ⇌ icl3 (s) if some chlorine is removed from the reaction, how will it affect the color of the mixture? a. it will become more green. b. it will not change. c. it will become more yellow. d. it will become more brown.
If some chlorine is removed from the reaction, It will become more green and brown.
According to the principle, if a reaction system is subjected to a constraint at its equilibrium, such as a change in concentration, volume, pressure, or temperature, the equilibrium position will alter in a way that the restriction is eliminated.
What happens to chlorine when it reacts?
Hydrochloric acid and chloric acid are created when chlorine combines with water. In sunlight, a separate process takes place when water and chlorine combine to produce oxygen and hydrochloric acid.Is chlorine green or Colourless?
At room temperature, chlorine is a gas that is yellow-green. It possesses the highest electron affinity and the third-highest electronegativity on the revised Pauling scale, behind only oxygen and fluorine, making it an exceptionally reactive element and a powerful oxidising agent.Learn more about chlorine
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Determine the age of a rock (in years) containing 0. 068 g of uranium-238 (t1/2 = 4. 5×109 yr) and 0. 025 g of lead-206. (assume that all the lead-206 came from 238u decay. )
The age of rock that is containing 0.628 g Uranium-238 is 2032631864.35 years.
What is half-life?Half-life can be given as the time required by the object to reduced to half of its initial concentration. The concentration remained can be given as:
Final concentration = Initial concentration * 1/2 ^ (t/t1/2)
The initial concentration of rock has been the remaining uranium-238 and lead-206 cumulative concentration. Thus, the initial concentration is given as:
Initial concentration = Uranium-238 + Lead-206
Initial concentration = 0.068 g + 0.025 g
Initial concentration = 0.093g
The final concentration of Uranium-238 remained = 0.68 g
The half life given = 4.5 × 10⁹ years
The age (t) of the rock can be given as:
[tex]0.068=0.093\left(\frac{1}{2}\right)^{\frac{t}{4.5\times \:10^9}}\\\\\frac{t\times \:10^{-9}}{4.5}\ln \left(\frac{1}{2}\right)=\ln \left(\frac{68}{93}\right)\\\\t=2032631864.35961[/tex]
Thus, the age of rock that has remaining 0.068 g Uranium-238 is 2032631864.35 years.
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