AP Chemistry Unit 9.1-9.4 Thermodynamics

Which change is exothermic?

• negative delta H

• heat is absorbed by system

• temperature decreases

• bubbles form

Which is exothermic?

• temperature decreases

• heat is released by system

• liquid changes to gas

• products are at higher energy than reactants

which is exothermic?

• temperature decreases

• breaking bonds

• system releasing heat to surroundings

• chemical reaction

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NGSS.HS-PS3-1

Which is NOT endothermic

• positive delta H

• heat is a reactant

• heat is right of arrow

• bonds breaking

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which is endothermic?

• IMFs broken

• negative delta H

• products are lower energy than reactants

• temperature increases

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Which is endothermic?

• bonds formed

• phase change gas --> liquid

• temperature increases

• positive delta H

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Which change is the MOST exothermic?

• condensing

• vaporizing

• fusion

• solidification

Which changes is the MOST endothermic?

• Condensing

• Vaporizing

• Fusion

• Solidification

Which substance would be able to absorb the most energy if each sample experiences the same temperature change?

• 50 grams of aluminum

• 5 grams of aluminum

• 150 grams of aluminum

• 1000 gram of aluminum

Which substance would experience the biggest temperature change if each sample absorbed the same energy?

• 100 grams of water

• 25 grams of water

• 5 grams of water

• 2500 grams of water