Q: Which of the following is the correct formula for molarity?

$M = \frac{\text{moles solute}}{\text{L of solution}}$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting in moist air

Question 2

A sample of gas occupies 240 mL at 25.0 \ ^\circ \mathrm{C} and 1.21 atm. What is the molar mass of the gas if the sample weighs 0.530 g? (Use $PV = nRT$ with $R = 0.0821\ \mathrm{L\ atm\ mol^{-1}\ K^{-1}}$)

Accepted Answer

28.8 \ \mathrm{g\ mol^{-1}}

Question 3

Which of the following compounds will have the highest vapor pressure at room temperature?

Accepted Answer

CH_3OH

Question 4

Calculate the empirical formula for a compound with the following elemental analysis: 52.14% C, 13.13% H, 34.73% O.

Accepted Answer

$\mathrm{C}_2\mathrm{H}_6\mathrm{O}$

Question 5

Which of the following statements about atomic mass is correct?

Accepted Answer

The atomic mass is a weighted average of the masses of all naturally occurring isotopes.

Question 6

A 10.0 g sample of hydrogen gas is contained in a 10.0 L vessel at 25.0 \ ^\circ \mathrm{C}. What is the pressure of the gas? ($R = 0.0821\ \mathrm{L\ atm\ mol^{-1}\ K^{-1}}$)

Accepted Answer

12.25 atm

Question 7

Which of the following best describes the Lewis structure and geometry of $\mathrm{NO}_3^-$?

Accepted Answer

Trigonal planar, with three resonance structures

Question 8

Which of the following is the correct balanced equation for the reaction of aluminum with iron(III) oxide in a thermite reaction?

Accepted Answer

$2\mathrm{Al}(s) + \mathrm{Fe}_2\mathrm{O}_3(s) \rightarrow 2\mathrm{Fe}(l) + \mathrm{Al}_2\mathrm{O}_3(s)$

Question 9

Which of the following is the correct formula for calculating the energy of a photon?

Accepted Answer

$E = h
u$

Question 10

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250.0 mL of solution. What is the molarity of the solution? ($\mathrm{NaCl}$ molar mass = 58.44 g/mol)

Accepted Answer

0.342 \ \mathrm{M}

Question 11

Which of the following gases will have the highest average speed at the same temperature?

Accepted Answer

He

Question 12

Which of the following is a correct application of the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 13

Which of the following best explains why $\mathrm{H}_2\mathrm{O}$ has a higher boiling point than $\mathrm{H}_2\mathrm{S}$?

Accepted Answer

$\mathrm{H}_2\mathrm{O}$ forms hydrogen bonds, while $\mathrm{H}_2\mathrm{S}$ does not.

Question 14

A 10.0 g sample of substance A at 72.1 \ ^\circ \mathrm{C} is submerged into 15.2 g of water at 24.2 \ ^\circ \mathrm{C} in an insulated container. The final temperature is 34.5 \ ^\circ \mathrm{C}. What is the specific heat capacity of substance A? ($c_{\mathrm{H}_2\mathrm{O}} = 4.18\ \mathrm{J\ g^{-1}\ ^\circ C^{-1}}$)

Accepted Answer

0.612 \ \mathrm{J\ g^{-1}\ ^\circ C^{-1}}

Question 15

Which of the following is the correct formula for molarity?

Accepted Answer

$M = \frac{	ext{moles solute}}{	ext{L of solution}}$

Question 16

Which of the following is the correct relationship between wavelength ($\lambda$), frequency ($
u$), and the speed of light ($c$)?

Accepted Answer

$c = \lambda 
u$

Question 17

Which of the following is the correct formula for calculating the energy change in a system?

Accepted Answer

$\Delta E = q + w$

Question 18

Which of the following is the correct formula for the dilution of a solution?

Accepted Answer

$M_1V_1 = M_2V_2$

Question 19

Which of the following is the correct formula for the ideal gas law?

Accepted Answer

$PV = nRT$

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