Q: Which of the following is the correct formula for calculating the percent yield in a chemical reaction?

$\frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100$

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

$\text{Molarity} = \frac{\text{moles of solute}}{\text{liters of solution}}$

Q: Which of the following is the correct net ionic equation for the reaction between aqueous NaCl and AgNO$_3$?

$\text{Ag}^+ (aq) + \text{Cl}^- (aq) \rightarrow \text{AgCl} (s)$

Q: Which of the following is the correct formula for calculating the enthalpy change ($\Delta H$) of a reaction using bond enthalpies?

$\Delta H = \sum \text{Bond enthalpies of bonds broken} - \sum \text{Bond enthalpies of bonds formed}$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A sample contains sodium chloride (NaCl) crystals mixed with sand. Which classification best describes this sample?

Accepted Answer

Heterogeneous mixture

Question 3

Which of the following is the correct formula for calculating the percent yield in a chemical reaction?

Accepted Answer

$\frac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100$

Question 4

Which of the following statements about the law of conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system

Question 5

A student needs to convert 25.0 °C to Kelvin. Which equation should they use?

Accepted Answer

$K = ^\circ C + 273.15$

Question 6

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$1s^2\ 2s^2\ 2p^4$

Question 7

Which of the following best explains why water (H$_2$O) has a higher boiling point than methane (CH$_4$)?

Accepted Answer

Water forms hydrogen bonds, which are stronger than the London dispersion forces in methane

Question 8

Which of the following is the correct formula for calculating the molarity of a solution?

Accepted Answer

$	ext{Molarity} = \frac{	ext{moles of solute}}{	ext{liters of solution}}$

Question 9

A balloon filled with helium gas at 1.00 atm and 300 K has a volume of 2.00 L. If the temperature is increased to 600 K at constant pressure, what will be the new volume?

Accepted Answer

4.00 L

Question 10

Which of the following is the correct Lewis structure for carbon dioxide (CO$_2$)?

Accepted Answer

O=C=O with two lone pairs on each oxygen

Question 11

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons

Question 12

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

Accepted Answer

$E = h 
u$

Question 13

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 14

Which of the following is a strong acid?

Accepted Answer

HCl

Question 15

Which of the following is the correct formula for calculating the pressure of a gas using the ideal gas law?

Accepted Answer

$P = \frac{nRT}{V}$

Question 16

Which of the following is the correct net ionic equation for the reaction between aqueous NaCl and AgNO$_3$?

Accepted Answer

$	ext{Ag}^+ (aq) + 	ext{Cl}^- (aq) ightarrow 	ext{AgCl} (s)$

Question 17

Which of the following best describes the VSEPR geometry of ammonia (NH$_3$)?

Accepted Answer

Trigonal pyramidal

Question 18

Which of the following is the correct formula for calculating the enthalpy change ($\Delta H$) of a reaction using bond enthalpies?

Accepted Answer

$\Delta H = \sum 	ext{Bond enthalpies of bonds broken} - \sum 	ext{Bond enthalpies of bonds formed}$

Question 19

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

CO$_2$

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