AP Chemistry - Unit 6 - Thou Shall Not Forget

What is the role of heat in chemical reactions?

• Heat has no effect on chemical reactions.

• Heat can influence the direction of a reaction and determine whether it is endothermic or exothermic.

• Heat only affects the speed of the reaction.

• Heat is only relevant in physical changes, not chemical reactions.

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NGSS.HS-PS1-4

NGSS.HS-PS3-4

NGSS.HS-PS1-5

Define endothermic reaction.

• A reaction that releases heat into the surroundings.

• A reaction that absorbs heat from the surroundings.

• A reaction that occurs at a constant temperature.

• A reaction that produces light energy.

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NGSS.HS-PS1-4

What is bond strength?

• The amount of energy required to break a bond between two atoms.

• The total number of bonds in a molecule.

• The strength of a bond in a crystal lattice.

• The ability of a bond to conduct electricity.

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NGSS.HS-PS1-4

What is the number of Carbon-Carbon single bonds formed in a molecule with 2 carbon atoms?

• 1

• 2

• 3

• 4

What is the relationship between bond stability and bond strength?

• Stronger bonds are generally more stable than weaker bonds.

• Weaker bonds are generally more stable than stronger bonds.

• Bond stability and bond strength are unrelated.

• Bond strength increases with bond stability.

In an endothermic reaction, how do the bonds formed in the products compare to the reactant bonds?

• The bonds formed in the products are stronger/more stable than the reactant bonds.

• The bonds formed in the products are equal in strength/stability to the reactant bonds.

• The bonds formed in the products are weaker/less stable than the reactant bonds.

• The bonds formed in the products are unaffected by the reactant bonds.

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NGSS.HS-PS1-4

What happens to the energy during an endothermic reaction?

• Energy is released into the surroundings.

• Energy is absorbed from the surroundings.

• Energy remains constant throughout the reaction.

• Energy is converted into mass.

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NGSS.HS-PS1-4

What type of process occurs when there is an increase in separation between ions in a solute during dissolution?

• Exothermic

• Endothermic

• Isothermal

• Sublimation

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NGSS.HS-PS3-4

What is the significance of ΔH in a chemical reaction?

• ΔH represents the change in temperature of the reaction.

• ΔH indicates the concentration of reactants in the reaction.

• ΔH represents the change in enthalpy, indicating whether a reaction is endothermic or exothermic.

• ΔH measures the speed of the reaction.

How does bond formation relate to energy changes in a reaction?

• Bond formation requires energy, while bond breaking releases energy.

• Bond formation releases energy, while bond breaking requires energy.

• Both bond formation and bond breaking release energy.

• Both bond formation and bond breaking require energy.

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NGSS.HS-PS1-4