Answer:
0.084 moles of H₂O
Explanation:
RAM of Mg = 24, of H = 1, of O = 16
Mg(OH)₂ + 2HCI --> MgCl2 + 2H₂O
Mole of Mg(OH)₂ = mass/MolarMass
= 1/24 = 0.042mol
From the equation,
1 mole of Mg(OH)₂ = 2 moles of H₂O
0.042mol of Mg(OH)₂ = 2 × 0.042 of H₂O
= 0.084 moles of H₂O
Which of these is an example of a physical property? A. Iron rusts when exposed to air. B. Table salt is a white crystal. C. Sodium oxidizes in air. D. Potassium ignites when placed in water.
Explanation:
Iron rusts when exposed to air,Sodium oxidizes in air,Potassium ignites when placed in water.These all are irreversible reaction .What is physical change ? When a substance change its physical state No new chemical is formedExamples :- Boling of water, melting of solids, shredding of paper.Which is always going to be the highest ionization energy?
Group of answer choices
A. 2nd Ionization Energy
B. 1st Ionization energy
C. All Ionization energies are equal.
D. 3rd Ionization Energy
Answer: I think it's B.
Explanation:
The second ionization energy is always the highest ionization energy. Ionization energy is the energy required to remove an electron from an atom in its gaseous state. Hence the correct option is A.
The first ionization energy is the energy required to remove the first electron from an atom. The second ionization energy is the energy required to remove the second electron from an atom that has already lost one electron.
The first ionization energy is always lower than the second ionization energy because the first electron is easier to remove because it is not as strongly attracted to the nucleus.
Once one electron has been removed, the remaining electrons are more strongly attracted to the nucleus, making it more difficult to remove the second electron.
Therefore, option A) 2nd Ionization Energy is correct.
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A syringe containing 2.56 mL of He gas at 75.2 degrees Celsius is cooled to 18.2 degrees Celsius. What is the final volume of the gas?
Answer:
v = 2.141 ml
Explanation:
we can use the "ideal gas law" :-
PV=nRTp :- pressure ( pa )
V :- Volume ( m³ )
n :- amount of substance ( mol )
R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )
T :- Temperature ( K)
4. The positive Biuret test indicates the presence of ....... bond in proteins.
The positive Biuret test indicates the presence of Peptide bond in proteins.
How to do Biuret test for proteins?
Follow these simple steps if you want to know practically:
Step 1: Take a 3 clean and dry test tubes.
Step 2: Add 1/2 ml of test solution to one test tube, albumin for another, and distilled water to third test tube.
Step 3: Add 3-4 drops of Biuret reagent to each test tube.
Step 4: Shake wee and let it be for 4-5 minutes.
Step 5: Observe the colour changes.
Peptide bonds are (C - N ) bonds present in proteins. The Biuret reagent colour is Pale blue and when you test for protein, if the solution contain protein, when you add the Biuret reagent it will turns to Purple. If there is no protein then the colour remains same.
The Biuret reagent is made up of Hydrated copper sulfate, sodium hydroxide, and Rochelle salt (sodium-potassium tartrate).
Peptide bond is also referred to as Amide bonds, it is formed between the Nitrogen atom of one amino acid and the Carbonyl carbon of second amino acid.
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Determine which elements or compounds are reactants in the following equation calcium + chlorine = calcium chloride
Answer:
See below
Explanation:
Calcium and chlorine are the reactants ..... they 'react' in a chemical reaction to form the compound calcium chloride .
If a thermometer reads 17° C, what is the temperature in Fahrenheit?
Answer:
62.6
Explanation:
formula = (°C x 9/5) + 32
(17°C x 9/5) + 32
30.6 + 32
62.6
Find the amount of heat energy needed to convert 150 grams of ice at -15°C to ice at -63°C.
Group of answer choices
A. (-) 14760 Joules because the ice is being heated.
B. (-) 14760 Joules because the ice is cooling.
C. 14760 Joules because the ice is cooling.
D. 14760 Joules because the ice is being heated.
The heat needed is (-) 14760 Joules because the ice is cooling.
What is heat?The term heat refers to a form of energy that can be observed as a result of temperature difference between two bodies. We can recall that heat always flows from the hotter to the cooler body.
Given that the heat added to a substance can be calculated by the use of H = mcdT
Where;
H = heat
m = mass
c = specific heat capacity
T = temperature change
Hence;
H = 150 g * 2.03 Jg∘C * (-63 - (-15))
H = (-) 14760 J
Hence the heat needed is (-) 14760 Joules because the ice is cooling.
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How many neutrons does an atom of Uranium 240?
Group of answer choices
A. 148
B. 146
C. 92
D. 240
Answer:
Number of neutrons is equal to 148.
1)Determine the hydroxide concentration in a 0.5M of hydrochloric acid? 0.5M of potassium hydroxide.
2)What is the hydroxide ion concentration of a solution if the pH is 5.36?
3)what is the concentration of a hydrochloric acid solution if 3.5mL are needed to neutralize 7.6mL of 0.25M sodium hydroxide?
4) write the bronsted- Lowry reaction between ammonia and sulfuric acid. Label the acid, base, and their conjuagtes.
What is the amount of energy required to raise the temperature of 150 grams of aluminum by 10°C?
Group of answer choices
A. 13.45 J
B. 0.897 J
C. 1345.5 J
D. 4.18 J
Answer:
C.) 1345.5 J
Explanation:
To find the energy, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy (J)
-----> m = mass (g)
-----> c = specific heat (J/g°C)
-----> ΔT = change in temperature (°C)
The specific heat of aluminum is 0.89 J/g°C. You can plug the given values into the equation and solve.
Q = mcΔT
Q = (150 g)(0.89 J/g°C)(10 °C)
Q = 1335
*It is up to you whether you wish to trust this answer. My answer may be slightly different due to using a different specific heat.
Consider the calculation of the pressure in kilopascals exerted by 1.25 g of nitrogen gas in a flask of volume 250 mL (0.250 dm3) at 20°C. The amount of N2 molecules (of molar mass M 28.02 g mol 1) present is
The amount of the nitrogen gas, N₂ molecules present is 2.68×10²² molecules
Avogadro's hypothesis1 mole of N₂ = 6.02×10²³ molecules
How to determine the mole of N₂We'll begin by calculating the number of mole of N₂. This can be obtained as follow:
Mass of N₂ = 1.25 gMolar mass of N₂ = 28.02 g/molMole of N₂ =?Mole = mass / molar mass
Mole of N₂ = 1.25 / 28.02
Mole of N₂ = 0.0446 mole
How to determine the molecules of N₂ presentFrom Avogadro's hypothesis,
1 mole of N₂ = 6.02×10²³ molecules
Therefore,
0.0446 mole N₂ = 0.0446 × 6.02×10²³
0.0446 mole N₂ = 2.68×10²² molecules
Thus, the molecules of N₂ present is 2.68×10²² molecules
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Calculate the volume in litres (L) of 1.41 mol of gas at 68.0 kPa and 27.00 °C (gas constant R = 8.314 J mol K-.).
1. 664 L
2. 0.384L
3. 51.7L
4. 4.66L
5. 0.511L
Answer:
3.) 51.7 L
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In the equation,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)
-----> T = temperature (K)
First, you need to convert the temperature from Celsius to Kelvin. Then, you can plug the given values into the equation and simplify to find "V".
P = 68.0 kPa R = 8.314 kPa*L/mol*K
V = ? L T = 27.00 °C + 273 = 300 K
n = 1.41 moles
PV = nRT <----- Ideal Gas Law
(68.0 kPa)V = (1.41 moles)(8.314 kPa*L/mol*K)(300 K) <----- Insert values
(68.0 kPa)V = 3516.822 <----- Multiply right side
V = 51.7 <----- Divide both sides by 68.0
In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. Which postulate of kinetic molecular theory best explains how this is possible? (3 points)
Attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly.
Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.
Gases consist of a large number of small particles, with a lot of space between the particles.
Gas particles are in constant, random motion, and higher kinetic energy means faster movement.
Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy this postulate of Kinetic Molecular Theory best explain that how this is possible.
Hence, Option B is correct answer.
What is Kinetic Molecular Theory ?The Kinetic Molecular Theory or KMT states that gases are composed of a large number of particles. In these particles are much smaller than the distance between particles. No attraction or repulsion between these particles.
What are the Postulates of Kinetic Molecular Theory ?The postulates of kinetic theory of gases are:
Collision are perfectly elastic. No energy is lost or gained from collision. There is no change in energy of either the particles or the wall upon collision. The lighter gas molecules moves fast as compared to heavier molecules.Collisions between gas particles or collisions with the vessel walls are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the vessel.
Thus from the above conclusion we can say that Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy this postulate of Kinetic Molecular Theory best explain that how this is possible.
Hence, Option B is correct answer.
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For which of the following reactions is S° > 0.
Choose all that apply.
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g)
2CO2(g) + N2(g) ---->2CO(g) + 2NO(g)
2N2(g) + O2(g) -----> 2N2O(g)
S(s,rhombic) + 2CO(g) ----> SO2(g) + 2C(s,graphite)
NH4Cl(s) ----> NH3(g) + HCl(g)
The entropy of the given reactions increases (S° > 0):
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.NH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.What is entropy?
Entropy measure how disordered a system is. It a measure of how dispersed or random the total energy of a system is. The symbol for entropy is S.
A system in which entropy increases is one in which S° > 0.
The entropy of a system decreases when S° < 0.
Entropy of a system increases (S° > 0) if any change results in an increase in temperature, increase in number of molecules, or an increase in volume.
Considering the given systems, the entropy changes is as follows:
2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.2CO2(g) + N2(g) ---->2CO(g) + 2NO(g) --> no change2N2(g) + O2(g) -----> 2N2O(g) ---> decreasesS (s,rhombic) + 2CO(g) ----> SO2(g) + 2C (s,graphite) ---> no changeNH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.In conclusion, an increase in volume and moles of substances results in entropy increase.
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Help please I really don’t know what i’m doing.
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C₁₂H₂₂O₁₁
1 )
Molar mass = 12 x 12 + 22 x 1 + 11 x 16
= 144 + 22 + 176
= 342 g
2 )
100 mL of 1.0 M will contain 1.0 x0.100 = .1 mole of sucrose
0.1 mole of sucrose = 0.1 x 342 g = 34.2 g of sucrose.
So , mass of sucrose required is 34.2 g .
3 )
100 mL of .5 M sucrose = .100 x .5 mole of sucrose
= .05 mole of sucrose
.05 mole of sucrose = .05 x 342 g = 17.1 g of sucrose .
So , mass of sucrose required is 17.1 g .
How do chemical reactions differ from nuclear reactions? (2 points) Chemical reactions involve electrons and protons, and nuclear reactions only involve protons. Chemical reactions involve changes in bonding, and nuclear reactions involve changes in an atom's nucleus. Chemical reactions involve forming bonds, and nuclear reactions involve breaking bonds. Chemical reactions involve sharing of electrons, and nuclear reactions involve the formation of ions.
Nuclear reactions include a change in the nucleus of an atom, which typically results in the production of a new element. Contrarily, chemical reactions only require the rearrangement of electrons and do not affect the nuclei; rather, they entail changes in bonding.
What is a nuclear reaction & a chemical reaction?
Nuclear fission or fusion processes were necessary for the synthesis of elements (decay). Atomic atoms' nuclei are the site of nuclear reactions, as the name suggests.Outside the atom's nucleus, in the electron cloud, chemical processes take to occur. The electromagnetic force is present during chemical processes. An atom's s and p subshells are where most chemical reactions take place. Valence electrons are those located in the outermost s and p subshells.Most of the operations we are acquainted with are powered by chemical reactions, including food digestion, and the conversion of carbohydrates into energy. Chemical processes lack the energy of nuclear reactions. In the atomic core, protons and neutrons participate in nuclear processes. Electrons orbit the nucleus during chemical reactions.Therefore it is concluded that option (B) is correct.
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If you rub a magnet over a metal screw driver, you can magnetize the screw driver. This is because the magnet
The magnet can cause the alignment of electron domains in the metal screw driver on rubbing, causing magnetism.
The magnetism in a permanent magnet is produced by magnetic moments of electrons in the magnet's constituent material. The material's atoms are each like tiny magnet bars. As a result of the quantum mechanical effect, the majority of these tiny magnets now prefer to align in a single direction to form domains, consequently magnetizing the entire substance.
Electrons exist in magnetic metals as well, although they are arranged differently. A strong magnet has a magnetic field strong enough to cause residual magnetism in the metal screwdriver by aligning the domains in it on rubbing with the metal.
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How many grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution?
Group of answer choices
A. 1.05 grams NaOH
B. 42,000 grams NaOH
C. 42 grams NaOH
D. 1050 grams NaOH
42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution (option C).
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of NaOH can be calculated using the following formula;
Molarity = no of moles ÷ volume
no of moles = 0.250L × 4.2 = 1.05mol
Hence, the mass of NaOH can be calculated as follows:
mass = 1.05 mol × 40g/mol = 42g
Therefore, 42 grams of NaOH are needed to make a 250.0 mL or a 4.2 M NaOH solution.
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Carbonyl chloride, also called phosgene, was used in World War 1 as a poisonous gas. The equilibrium concentrations for the reaction between carbon dioxide and molecular chlorine to form carbonyl chloride
CO(g) + Cl2(g) <--> CoCl2(g)
are [CO] = 1.2 x 10-2 M, [Cl2] = 0.054 M, and [CoCl2] = 0.14 M. Calculate the equilibrium constant (K).
Group of answer choices
A. K = 4.63 x 10-3
B. K = 216
C. K = 2.56
D. K = 6.23 x 102
From the calculations, the equilibrium constant is 216. Option B
What is the equilibrium constant?The equilibrium constant can depict the amount of reactants that is converted into products at a given time. We know that if thus number is large and positive, then it means that the reaction would proceed to the right.
Thus, we have the equation of the reaction as; CO(g) + Cl2(g) <--> CoCl2(g) and we know that;
K = [CoCl2]/ [CO] [Cl2]
[CoCl2] = concentration of CoCl2
[CO] = concentration of CO
[Cl2] concentration of Cl2
Substituting the values into the equation;
K = 0.14/ 1.2 x 10-2 * 0.054
K = 216
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State whether the following liquids are miscible with hexane (C6H14) by entering "yes" or "no".
Benzene, C6H6
iron (IIl) nitrate, Fe(NO3)3
Sulfuric acid, H2SO4
Benzene, C6H6 is miscible with hexane (C6H14) but iron (IIl) nitrate, and Sulfuric acid, H2SO4Fe(NO3)3 are not miscible with hexane (C6H14)
Since organic or non polar dissolves in nom polar solvent.here both benzene and hexane (C6H14) are non polar solvents.But iron (IIl) nitrate, Fe(NO3)3 and Sulfuric acid, H2SO4 are inorganic and polar, therefore cannot dissolve with non polar solvent like hexane.
Miscible is a flowery heard that oil and water aren't very miscible substances, while seltzer and orange juice are miscible and scrumptious.Miscible beverages are also described as liquids that can blend to form a homogeneous solution. Miscible drinks generally blend with out limit, meaning they may be soluble at all quantities.
Miscible approach the materials blend completely. If substances are miscible, they're also absolutely soluble in each other no matter the order of creation. for example, tetrahydrofuran and water are miscible.
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Consider the following reaction at 298 K.
Which of the following statements are correct?
From the calculation, the correct statements are;
n = 2 mol of electronsK < 1What are the true statements?Now we know that it is possible to obtain the equilibrium constant from the relation;
E°cell = 0.0592/n log K
E°cell = cell potential = -0.403 - 0.535 = -0.938 V
n = number of electrons = 2 electrons
K = equilibrium constant
Thus;
-0.938 = 0.0592/2 logK
-0.938 * 2/ 0.0592 = log K
K = 2 * 10^-31
ΔG = - nFE°cell
ΔG = - (2 * 96500 * -0.938)
ΔG = 181kJ/mol
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What is the
molality of 30g of NACI dissolved in 350g of water
Answer:
1.45 mol/kg
Explanation:
nilered videos
Answer:
1.47 m
Explanation:
The molality can be found using the following equation:
Molality = moles solute / mass (kg) solvent
In this case, NaCl is the solute and H₂O is the solvent. To find the molality, you need to (1) convert grams NaCl to moles (via the molar mass), then (2) convert grams H₂O to kilograms, and then (3) calculate the molality.
(Step 1)
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
30 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.513 moles NaCl
58.443 grams
(Step 2)
1,000 grams = 1 kg
350 grams H₂O 1 kg
-------------------------- x ----------------------- = 0.35 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass (kg) solvent
Molality = 0.513 moles NaCl / 0.35 kg H₂O
Molality = 1.47 m
The isotope sodium-24 has a half-life of 15 hours. Starting with 22 grams, how much remains in 30
hours?
Answer:
5.5 grams
Explanation:
To find how much of the isotope remains, you need to use the half-life equation:
[tex]N(t) = N_0(\frac{1}{2})^\frac{t}{h}[/tex]
In this equation,
-----> N(t) = remaining mass (g)
-----> N₀ = initial mass (g)
-----> t = time (hrs)
-----> h = half-life (hrs)
You can find the remaining mass by plugging the given values into the equation and solving.
N(t) = ? g t = 30 hrs
N₀ = 22 g h = 15 hrs
[tex]N(t) = N_0(\frac{1}{2})^\frac{t}{h}[/tex] <----- Half-life equation
[tex]N(30) = (22)(\frac{1}{2})^\frac{30}{15}[/tex] <----- Insert values
[tex]N(30) = (22)(\frac{1}{2})^2[/tex] <----- Simplify exponent
[tex]N(30) = (22)(0.25)[/tex] <----- Solve [tex](\frac{1}{2} )^2[/tex]
[tex]N(30) = 5.5[/tex] <----- Multiply 22 and 0.25
Identify the correct statement regarding the strength of chemical bonds.
A) Strong bonds occur with high temperature and weak bonds with low temperature.
B) If the bond energy between atoms is very weak then the bond between the atoms is strong.
C) Strong bonds from with large atoms and weak bonds with small atoms.
D) If the bond energy between atoms is very high the the bond between the atoms is strong.
If the bond energy between atoms is very high the the bond between the atoms is strong.
What are chemical bonds?Chemical bonds are formed wen two atoms are combined together. The chemical bonds are responsible for holding the atoms together. These chemical bonds could be ionic or covalent in nature. Coordinate bonds have hybrid behavior between ionic and covalent bond types.
We know that the bond energy refers to the energy that must be supplied in order to break the bonds. A high bond energy implies that it takes a whole lot of energy to break the bond. If it takes a lot of energy to break the bond, then the bond must be a strong bond which holds the two atoms together in the compound. Hence, if the bond energy between atoms is very high the the bond between the atoms is strong.
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C11H24 how would you call is it decane or?
PLS
PLA HELP WOTH THIS CHEMISTRY WORK!!!
I need help I feel like it might be wrong thanks
Answer:
No it's correct.
Explanation:
The water temperature is 25 degrees Celsius. it's rigHT.
What is the temperature in Kelvin of 0.46 mol of a gas that is at a pressure of 0.88 atm and volume of 675 mL?
Explanation:
we can use the "ideal gas law" :-
PV = nRT
p :- pressure ( pa )
V :- Volume ( m³ )
n :- amount of substance ( mol )
R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )
T :- Temperature ( K)
Can anyone please give me name of these disaccharides? My professor wrote these on whiteboard and didn't explain anything.
The name of the disaccharide above is sucrose
What are disaccharides?Disaccharides are substances which are composed of two molecules of simple sugars or monosaccharides linked to each other.
Below are some examples of disaccharides:
SucroseMaltoseLactoseCellobioseSo therefore, the name of the disaccharide above is sucrose
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The value of gravitational acceleration of a body on earth is 9.8 meters/second 2 power. The gravitational energy for a 1.00 kg object is found to be 12.5 joules. How high is the ground level, where KE = 0
Answer:
I don't know what the hell is going on with the this.