YesYes , the water freezes at 0°C and every substance has it's own freezing points.
What is Freezing point ?The temperature at which a liquid solidify.The temperature at which the liquid and solid substance are in equilibrium at atmospheric pressure: melting point of water is 0°Celsius or 32°Farenhiet.
The freezing point of alcohol will be -114°C .
The freezing point of Bleach will be 19°F .
The Freezing point of vinegar will be 28°F .
The freezing point of rubbing alcohol will be- 100°C .
So,every substance has it's own freezing point.
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What is the identity of a metal that has a mass of 27.0 g and a volume of 10.0 cm3?
Group of answer choices
A. Gold
B. Aluminum
C. Lead
D. Copper
The identity of a metal that has a mass of 27.0g and a volume of 10.0cm is Aluminium. That is option B.
What is molar mass?Molar mass is defined as the mass in grams of one mole of an element. This is measured in grams/mole of that substance.
The metal that is 27.0 g and a volume of 10.0 cm3 is aluminium because aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.
Therefore, the identity of a metal that has a mass of 27.0g and a volume of 10.0cm is Aluminium.
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How many atoms in 56.4 g of platinum (Pt)
56.4 g of platinum will contain 1.7417 x [tex]10^{23}[/tex] atoms
Number of atoms in substancesAccording to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] atoms of the substance.
The problem is we don't know how many moles of platinum that are present in 56.4 g. Thus, the first thing is to calculate the number of moles of platinum present in 56.4 g of the substance.
This can be achieved by using the formula, mole = mass/molar mass. Keep in mind that the molar weight of platinum is 195 g/mol.
Therefore,
Mole of 56.4 g of platinum = 56.4/195 = 0.2892 moles
If,
1 mole of any substance = 6.022 x [tex]10^{23}[/tex] atoms
Then,
0.2892 moles of platinum = 0.2892 x 6.022 x [tex]10^{23}[/tex] atoms = 1.7417 x [tex]10^{23}[/tex] atoms
In other words, 56.4 g of platinum will contain 1.7417 x [tex]10^{23}[/tex] atoms 1.7417 x [tex]10^{23}[/tex] atoms of the metal.
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please solve this fast
25.0 mL of an LiOH solution were titrated with 29.15 mLof a 0.205 M H3PO4 solution to reach the equivalence point. What is the molarity of the LiOH solution?
Answer:
0.717 M LiOH
Explanation:
(Step 1)
Calculate the moles of H₃PO₄ using the molarity equation.
29.15 mL / 1,000 = 0.02915 L
Molarity = moles / volume (L)
0.205 M = moles / 0.02915 L
0.00598 = moles
(Step 2)
Convert moles H₃PO₄ to moles LiOH using the mole-to-mole ratio from reaction coefficients.
1 H₃PO₄ + 3 LiOH -----> Li₃PO₄ + 3 H₂O
^ ^
0.00598 moles H₃PO₄ 3 moles LiOH
------------------------------------ x -------------------------- = 0.0179 moles LiOH
1 mole H₃PO₄
(Step 3)
Calculate the molarity of LiOH using the molarity equation.
25.0 mL / 1,000 = 0.0250 L
Molarity = moles / volume (L)
Molarity = 0.0179 moles / 0.0250 L
Molarity = 0.717 M
State whether the following liquids are miscible with water (H2O) by entering "yes" or "no".
1) Benzene, C6H6
2) Methanol, CH3OH
3) Chloroform, CHCl3
If an electron falls from the n = 2 to the n = 1 energy levels in a Hydrogen atom what wavelength of light is emitted?
Group of answer choices
A. 122 nm
B. 1024 nm
C. 97 nm
D. 103 nm
The wavelength is obtained as 122 nm. Option A
What is the wavelength?We know that from the Bohr model of the atom, an electron can move from a higher energy level to a lower energy level or from a lower energy level to a higher energy level. This is the idea of energy quantization as put forward by Neill Bohr.
The wavelength can be obtained by the use of the formula;
1/λ = RH(1/n^2initial - 1/n^2 final)
λ = wavelength of the emitted light
RH = Rydberg's constant
n intial = initial energy level
nfinal = final energy level
Thus;
1/λ = 1.09 * 10^7(1/1^2 - 1/2^2)
1/λ = 1.09 * 10^7( 1 - 0.25)
λ = 122 nm
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How much heat is released if a 10.0 gram piece of aluminum is cooled from 70°C to 50°C?
Group of answer choices
A. +180 J
B. -200 J
C. -180 J
D. +200 J
C. The heat released when the aluminum is cooled from 70°C to 50°C is -180 J.
What is Specific heat capacity?
Specific heat capacity is the quantity of heat needed to raise the temperature per unit mass.
Heat released when the aluminum is cooledThe heat released when the aluminum is cooled from 70°C to 50°C is calculated as follows;
Q = mcΔθ
where;
m is mass of the aluminum c is specific heat capacityΔθ is change in temperatureQ = (10)(0.9)(50 - 70)
Q = -180 J
Thus, the heat released when the aluminum is cooled from 70°C to 50°C is -180 J.
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100.0 mL of a 0.695 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution?
Answer:
0.116 M
Explanation:
(Step 1)
Calculate the amount of moles using the molarity ratio.
100.0 mL / 1,000 = 0.1000 L
Molarity = moles / volume
0.695 M = moles / 0.1000 L
0.0695 = moles
(Step 2)
Calculate the new molarity using the moles and new volume.
500.0 mL / 1,000 = 0.5000 L
Molarity = moles / volume
Molarity = 0.0695 moles / (0.1000 L + 0.5000 L)
Molarity = 0.0695 moles / (0.6000 L)
Molarity = 0.116 M
A sample of nitrogen gas has a volume of 3.0 L at 25 degrees Celsius and 720 torr. What would the volume be at STP? (Hint: This is a combined gas law question).
Answer:
2.60 L
Explanation:
To find the new volume, you need to use the Combined Gas Law:
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure. volume, and temperature.
At STP, the pressure is 1.0 atm and the temperature is 273 K. Before you can plug the values into the equation, you need to convert pressure from torr to atm and the temperature from Celsius to Kelvin.
P₁ = 720 torr / 760 = 0.947 atm P₂ = 1.0 atm
V₁ = 3.0 L V₂ = ? L
T₁ = 25 °C + 273 = 298 K T₂ = 273 K
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex] <----- Combined Gas Law
[tex]\frac{(0.947atm)(3.0L)}{298K}=\frac{(1.0atm)V_2}{273K}[/tex] <----- Insert values
[tex]\frac{2.84}{298K}=\frac{(1.0atm)V_2}{273K}[/tex] <----- Multiply 0.947 and 3.0
[tex]0.00954=\frac{(1.0atm)V_2}{273K}[/tex] <----- Simplify left side
[tex]2.60={(1.0atm)V_2}[/tex] <----- Multiply both sides by 273
[tex]2.60L=V_2[/tex] <----- Divide both sides by 1.0
Which of the following properties allows water molecules to stick to othe types of molecules?
A) Viscosity
B) Adhesion
C) Surface Tension
D) Density
Answer:
B.) Adhesion
Explanation:
A.) is incorrect. Viscosity is a measure of internal friction that affects the fluidity of a liquid.
B.) is correct. Adhesion is the ability of water to stick to other substances (which are not water).
C.) is incorrect. Surface tension is the tension created by the bonds of the surface particles.
D.) is incorrect. Density is a ratio that compares mass to volume.
How many grams of water will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen given the following balanced chemical equation?
2H2 + O2 → 2H2O
Group of answer choices
A. 32.0 grams
B. 36.0 grams
C. 54.0 grams
D. 18.0 grams
Answer:
B.) 36.0 grams
Explanation:
To find the mass of water, you need to (1) convert grams H₂ to moles (using the molar mass), then (2) convert moles H₂ to moles H₂O (using mole-to-mole ratio from reaction coefficients), and then (3) convert moles H₂O to grams (using the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units.
Molar Mass (H₂): 2(1.008 g/mol)
Molar Mass (H₂): 2.016 g/mol
Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol
Molar Mass (H₂O): 18.014 g/mol
2 H₂ + O₂ -----> 2 H₂O
^ ^
4.0 g H₂ 1 mole 2 moles H₂O 18.014 g
--------------- x ---------------- x ------------------------ x --------------- = 36 g H₂O
2.016 g 2 moles H₂ 1 mole
help! awarding 20 points
a. The circulatory system in fish is one-directional while it is two-directional in humans.
b. P has a high concentration of carbon dioxide and low oxygen concentration whereas Q has high oxygen concentration and low carbon dioxide concentration.
What is the circulatory system?The circulatory system is the system of organism and tissues which help to transport blood and other fluids through the body of a living organism.
The organs of the circulatory system include:
The heartThe blood vessels - veins, arteries, capillariesa. In the given diagram sowing the circulatory system of man and the fish, it can be seen that the direction of blood flow in the fish is one way through the heart. However, in humans, the direction of blood flow is two-way through the heart.
b. The gas in P has a high concentration of carbon dioxide and low oxygen concentration. However, the gas flowing through Q has high oxygen concentration and low carbon dioxide concentration.
In conclusion, the circulatory system is important in the exchange of gases in the body.
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help me please with this question as soon as possible
0.5376 g is the minimum mass of sodium sulfite that we should add.
What is Molarity ?Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar concentration. The S.I unit of Molarity is molar (M) or mol/L.
The conversion sequence is
mL solution → L solution → mol → g
[tex]80\ mL \times \frac{1\ L}{1000\ mL} \times \frac{0.04\ \text{mol Calcium nitrate solution}}{L} \times \frac{168\ \text{Calcium nitrate solution}}{\text{mol Calcium nitrate solution}}[/tex]
= 0.5376 g
Thus from the above conclusion we can say that 0.5376 g is the minimum mass of sodium sulfite that we should add.
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When aqueous magnesium chloride reacts with liquid bromine
Classify H3PO4 as a strong acid or a weak acid.
Answer:
H3PO4 (phosphoric acid) is weak acid
Explanation:
This is because weak acid is an acid that ionizes only slightly in an aqueous solution.
Is HF the most polar among covalent bonds?
Answer:
No.
Explanation:
HI is more polar than HF
Using standard heats of formation, calculate the standard enthalpy change for the following reaction.
2BrF3(g) -----> Br2(g) + 3F2(g)
Using standard heats of formation, the standard enthalpy change for the reaction is mathematically given as
= 542.11 kJ
What is the standard enthalpy change for the following reaction?Generally, the equation for standard enthalpy change is mathematically given as
[tex]\Delta H rxn = \Delta H product - \Delta H reactant[/tex]
therefore,
[tex]\Delta H rxn = (\Delta H Br_2 + \Delta H 3F_2) - (\Delta H 2BrF_3)[/tex]
= (30.91 kJ + 3*0 kJ) - (2*(-255.6) kJ)
= 542.11 kJ
In conclusion, the standard enthalpy change for the following reaction is
= 542.11 kJ
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In order to dilute 40.0 mL of 0.600 M HCl to 0.200 M, the volume of water that would need to be added would be 200 mL. 80.0 mL. O 160 mL. 120 mL. 100 mL.
Answer:
80 ml
Explanation:
Moles to start = .04 L * .6 M/L = .024 moles
this is how much must be in the final dilution
.2 moles / liter * x liter = .024 moles
x = .024 / .2 = .12 liter final volume
start with . 040 then add .080 to get .12 liter
.080 liter = 80 ml
What if there was an inverse relationship between the temperature and the volume? How do you think the world might be different? How would this change our day-to-day lives?
If there was an inverse relationship between the temperature and the volume, our daily lives change because in high temperature things will contract.
What if there was an inverse relationship between the temperature and the volume?If there was an inverse relationship between the temperature and the volume then with increasing temperature decrease occur in the volume of a substance. If this type of relationship is present in the world, the objects will contract when the temperature is high and expand when the temperature is low which make the solid materials expand at winter and contract at summer season.
So we can conclude that if there was an inverse relationship between the temperature and the volume, our daily lives change because in high temperature things will contract.
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A student who prefers to study by converting lecture or written information into pictures, graphs, or charts, and then back into words
again: repeating the process as needed and watching videos most likely prefers which learning style?
O a. Visual
O b. Auditory
O c. Reading Writing
O d. Kinesthetic
The answer is C which is Reading Writing
A student who prefers to study by converting lecture or written information. The learning style of the student is reading writing. Thus option c is correct.
What is learning style?Learning style is defined as the hypothesis that learners can be classified based on how they process information.
It can also be defined as a set of theories aimed at explaining variances in individual learning.
There are basically seven types of learning style.
Visual learning style Kinesthetic learning styleAural learning styleSocial learning styleSolitary learning styleVerbal learning styleLogical learning styleReading and writing is one of the best style of learning as by this we can memorize the things for very long time.
Thus, the learning style of the student is reading writing. Thus option c is correct.
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What mass (g) of solute is contained in 417 mL of a 0.327 M magnesium fluoride (MgF2) solution?
Answer: [tex]\Large\boxed{m=8.5~g}[/tex]
Rounded to the nearest 2 significant figures
Explanation:
Given information
Volume of Solution = 417 mL
Molarity of Solution = 0.327 M (mol / L)
Given molecular weight
Mg (Magnesium) = 24 g / mol
F (Flourine) = 19 g / mol
Total Weight (MgF₂) = 24 + 2 × 19 = 62 g /mol
Given formula
m = V × M × n
m = massV = VolumeM = Molarityn = molar mass (molecular weight)Convert the unit of volume to Liter
1 L = 1000 mL
417 mL = 417 / 1000 = 0.417 L
Substitute values into the given formula
m = (0.417) × (0.327) × (62)
Simplify by multiplication
m = 136.359 × 62
[tex]\Large\boxed{m=8.5~g}[/tex]
Hope this helps!! :)
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A 24.5 mL sample of a 0.376 M aqueous hypochlorous acid solution is titrated with a 0.487 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added?
The pH of the solution when no base is added is 0.424.
An aqueous solution's acidity or basicity can be determined using the pH scale. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
The chemical formula of hypochlorous acid is HClO.
1 mole of HClO produces 1 mole of hydrogen ions and 1 mole of fluoride ions.
KOH (aq) + HClO (aq) → KClO (l) + H2O (l)
To calculate the pH of the solution when no base is added, we use the equation:
[tex]p_{H} = - log {H}^{+}[/tex]
We are given:
[tex]H^{+} = 0.376 M[/tex]
Putting values in the above equation, we get:
[tex]p_{H} = - log (0.376)[/tex]
[tex]p_{H}[/tex] = 0.424
Hence, the pH of the solution when no base is added is 0.424
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Find the number of moles of the following substances 210 grams of NaHCO3
The number of moles of 210 grams of NaHCO₃ is 2.5 moles.
How to find the Number of moles ?To calculate the number of moles use the formula
Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]
Mass of NaHCO₃ = 210 g
Now we have to find the Molar mass of NaHCO₃
= Atomic mass of Na + Atomic mass of H + Atomic mass of C + 3 (Atomic mass of O)
= 23 + 1 + 12 + 3 (16)
= 36 + 48
= 84 g/mol
Now put the value in above formula we get
Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]
= [tex]\frac{210\ g}{84\ g/mol}[/tex]
= 2.5 moles
Thus from the above conclusion we can say that The number of moles of 210 grams of NaHCO₃ is 2.5 moles.
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environmental conditions of the ocean
The environmental conditions of the ocean are:
Light availabilityOxygen levelsWater movementSalinityDensity and pH.What are the environmental impacts on the ocean?In our oceans, there are known to be a lot of environmental conditions that are known to often affect the growth, survival and also the productivity of marine organisms. These are the ones listed above.
Note that the increased concentration of chemicals, e.g. nitrogen and phosphorus is one that can be harmful to marine life.
Hence, The environmental conditions of the ocean are:
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Using the valence bond method, explain the structure of isocyanic acid in terms of the atomic bond method.
The structure of isocynide is
N=C
What is the importance of VSEPR theory?
Valence bond theory describes the electronic structure of molecule .The theory says that electrons fills the atomic orbitals of an atom within a molecule .
In the structure of isocynide there are triple bonds between Nitrogen and carbon . The bond length is 115.8pm and the bond angle is 180°. There is two pi and one sigma bond .
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The structure of isocynide is H--N=C
What is meant by valence bond?
Valence bond (VB) theory is a chemical bonding theory that describes the chemical bonding between two atoms. Like molecular orbital (MO) theory, it explains sticking using principles of quantum mechanics. According to valence bond theory, sticking is caused by the overlapping of half-filled atomic orbitals.
What is a valence bond structure?
Valence Bond theory represents covalent bond formation as well as the electronic form of molecules. The theory assumes that electrons inhabit atomic orbitals of individual atoms within a molecule, and that the electrons of one atom are drawn to the nucleus of another atom.
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Given the reaction
2 HI(g) <--> H2(g) + I2(g)
At 430 degrees Celsius, the equilibrium concentrations are [HI] = .5M, [H2] = 0.5 M, and [I2] = 1.5 M. What is the equilibrium constant (K)?
Group of answer choices
A. K = 3
B. K = 1.5
C. K = 0.33
D. K = 0.67
From the calculation, the equilibrium constant is obtained as 3. Option A
What is the equilibrium constant?The term equilibrium constant shows the extent to which we could see the conversion of the reactants to products in a reaction system. Now we know that the equilibrium constant can be obtained by the use of the formula;
K = [H2] [I2]/[HI]^2
Now we have that at equilibrium;
[H2] = 0.5 M
[I2] = 1.5 M
[HI] = 0.5M
It then follows that;
K = 1.5 * 0.5/( 0.5)^2
K = 3
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will BeCO3 Hydrolyze in aqueous medium?. If so how?... very urgent..
Answer:
BeCO3 will hydrolyze in an aqueous medium, yielding a basic solution.
Explanation:
In accord with the rules of salt hydrolysis, the cation [tex]Be^{2+}[/tex] can hydrolyze. The anion [tex]CO_{3} ^{2-}[/tex] can also hydrolyze, given that the resulting conjugate acid is weak.
Given that both ions hydrolyze, the Ka (acid ionization constant) and Kb (Base ionization constant) of each reactant (or product [that is, the conjugate acid and base for each ion]) must be compared.
Using the web (hopefully some sort of reference table has been provided to you):
Ka (for Be^2+) = [tex]3 * 10^{-7}[/tex]
Kb (for CO3^2-) = [tex]\frac{Kw (water)}{Ka (HCO3)}[/tex]
= [tex]\frac{1*10^{-14}}{4.7*10^{-11}}[/tex]
= [tex]2.1 * 10^{-4}[/tex]
The Kb > Ka, so the solution will be basic.
Hope this helps! My apologies if this answer is incorrect, I have not done this type of problem in a while.
Draw clearly the structural formulas of the given compounds. (a) 3-methyl heptane
See the attached image.
How many moles of Hydrogen gas will be produced if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid given the following balanced chemical reaction:
Mg + 2HCl → MgCl2 + H2
Group of answer choices
A. 1.25 moles
B. 5.0 Moles
C. 7.5 moles
D. 2.5 moles
Answer:
D.) 2.5 moles
Explanation:
To find the moles of H₂, you need to multiply the given value by the mole-to-mole ratio. This ratio consists of the coefficients in front of the relevant molecules. It is important to arrange the ratio in a way that allows for the cancellation of units.
1 Mg + 2 HCl -----> MgCl₂ + 1 H₂
^ ^
2.5 moles Mg 1 moles H₂
----------------------- x --------------------- = 2.5 moles H₂
1 mole Mg
Ideal Gas Law: Tutorial. At a party, you use a gas canister to fill balloons. The canister holds 4.47 moles of air. If the room is at 26.0°C and the gas pressure is 855 kilopascals, what is the volume of the canister? The volume of the canister is ___ liters. Type the correct answer in the box. Express your answer to the correct number of significant figures. Use the gas laws Fact sheet to help you.
Answer:
13.0 L
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)
-----> T = temperature (K)
After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation and simplify to find "V". The final answer should have 3 sig figs to match the sig figs of the given values.
P = 855 kPa R = 8.314 kPa*L/mol*K
V = ? L T = 26.0 °C + 273.15 = 299.15 K
n = 4.47 moles
PV = nRT
(855 kPa)V = (4.47 moles)(8.314 kPa*L/mol*K)(299.15 K)
(855 kPa)V = 11117.48496
V = 13.0 L