Thermochemistry Review

Which type of reaction absorbs heat from the surroundings?

• Exothermic

• Endothermic

• Isobaric

• Isothermal

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DOK Level 1: Recall

In calorimetry, what is primarily measured to determine heat transfer?

• Pressure change

• Volume change

• Temperature change

• Mass change

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DOK Level 1: Recall

Which of the following is an example of an exothermic reaction?

• Ice melting

• Water boiling

• Combustion of gasoline

• Evaporation of water

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DOK Level 1: Recall

• 436 kJ

• 872 kJ

• -466 kJ

• 1458 kJ

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DOK Level 2: Skill/Concept

What is the specific heat of a substance that requires 200 Joules of energy to raise the temperature of 5 grams of it by 10 degrees Celsius?

• 4 J/g°C

• 2 J/g°C

• 0.4 J/g°C

• 0.2 J/g°C

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DOK Level 2: Skill/Concept

Using Hess's Law, how would you determine the enthalpy change of a reaction that can be divided into multiple steps?

• Add the enthalpy changes of all the steps.

• Subtract the enthalpy changes of all the steps.

• Multiply the enthalpy changes of all the steps.

• Divide the enthalpy changes of all the steps.

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DOK Level 2: Skill/Concept

If a reaction has a heat of formation value of -241.8 kJ/mol, what does this indicate about the reaction?

• It absorbs 241.8 kJ of heat per mole of product formed.

• It releases 241.8 kJ of heat per mole of product formed.

• It neither absorbs nor releases heat.

• It requires an input of 241.8 kJ of energy to proceed.

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DOK Level 2: Skill/Concept

Explain how bond enthalpies can be used to determine the overall enthalpy change of a reaction.

• By adding up the bond enthalpies of all reactants and subtracting the bond enthalpies of all products.

• By subtracting the bond enthalpies of all reactants from the bond enthalpies of all products.

• By multiplying the bond enthalpies of reactants and products.

• By dividing the bond enthalpies of reactants by the bond enthalpies of products.

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DOK Level 3: Strategic Thinking

if heat is absorbed by the system from the surroundings, it is...

• Endothermic

• Exothermic

• Temperature

• Combustion

The diagram represents two solids and the temperature of each. What occurs when the two solids are placed in contact with each other?

• Heat energy flows from solid A to solid B. Solid A decreases in temperature

• Heat energy flows from solid A to solid B. Solid A increases in temperature

• Heat energy flows from solid B to solid A. Solid B decreases in temperature.

• Heat energy flows from solid B to solid A. Solid B increases in temperature.