Timed AP Chemistry Exam Practice Review

What is the recommended way to submit handwritten work?

• Submitting without showing any work

• Typing the answers instead of handwriting

• Using a dark pen or pencil on white paper

• On a piece of colored paper with a light pen

What is crucial for receiving full credit on the AP Chemistry exam?

• Submitting answers in a handwritten format only

• Providing the correct numerical answer only

• Showing all the steps that led to the answer

• Using fancy graphics and subscripts in typed answers

In the combustion of ethanol, what happens to oxygen?

• It acts as a catalyst

• It remains unchanged

• It is reduced

• It is oxidized

How can the yield of a product in a chemical reaction be maximized without adding reactants?

• Increase the volume of the reaction vessel

• Decrease the temperature for an exothermic reaction

• Add an inert gas to increase pressure

• Increase the temperature regardless of reaction type

What indicates a reaction is first order with respect to a reactant?

• The absorbance of the reactant decreases linearly over time

• The reaction rate doubles with the concentration of reactants

• The half-life remains constant over time

• The concentration doubles every half-life

What is the relationship between absorbance and time in a first-order reaction?

• Absorbance decreases exponentially over time.

• Absorbance increases linearly over time.

• Absorbance decreases linearly over time.

• Absorbance remains constant over time.

Which intermolecular force is primarily responsible for ethanol's higher boiling point compared to dimethyl ether?

• London dispersion forces

• Dipole-dipole interactions

• Hydrogen bonding

• Ionic bonding

What determines the hybridization of sulfur in SO3?

• The number of electron domains around sulfur

• The molecular geometry of SO3

• The presence of a double bond

• The total number of valence electrons

What is the correct expression for the equilibrium constant (KP) for the decomposition of SO3?

• KP = [SO2]^2[O2]/[SO3]^2

• KP = P[SO2]^2P[O2]/P[SO3]^2

• KP = P[SO3]^2/P[SO2]^2P[O2]

• KP = [SO3]^2/[SO2]^2[O2]

Is the decomposition of SO3 endothermic or exothermic, and why?

• Endothermic, because the equilibrium shifts towards products as temperature increases

• Exothermic, because the equilibrium shifts towards products as temperature decreases

• Exothermic, because the equilibrium shifts towards reactants as temperature increases

• Endothermic, because the equilibrium shifts towards reactants as temperature decreases