AP Chem 6.1,6.2 Quiz

What is an example of an exothermic reaction mentioned in the text?

• Cold pack

• Hot pack

• Ice melting

• Water boiling

What is the nature of a reaction with a negative change in enthalpy (ΔH)?

• Endothermic

• Exothermic

• Isothermal

• Adiabatic

What is the activated complex in a chemical reaction?

• A stable arrangement of atoms

• An unstable arrangement of atoms

• A permanent arrangement of atoms

• A non-reactive arrangement of atoms

In an endothermic reaction, how does the energy of the products compare to the reactants?

• Higher than the reactants

• Equal to the reactants

• Lower than the reactants

• Unchanged

What is the sign of ΔH for endothermic reactions?

• Positive

• Negative

• Zero

• Undefined

What is released in exothermic reactions?

• Energy

• Mass

• Volume

• Pressure

What does this profile diagram illustrate?

• Energy changes in an endothermic reaction

• Energy changes in an exothermic reaction

• Energy changes in a neutral reaction

• Energy changes in a reversible reaction

In the diagram above, which of the following is true?

• The reactants have more energy than the products and the reaction is endothermic

• The products have more energy than the reactants and the reaction is endothermic

• The reactants have more energy than the products and the reaction is exothermic

• The products have more energy than the reactants and the reaction is exothermic

If you were to put your hand near the reaction demonstrated above, how would it feel?

• cold

• warm

Which reaction energy profile below would feel cold?

• the profile on the left

• the profile on the right