AP Chemistry Thermochemistry Practice

• Heat-Joules

• Mass-Grams

• Specific Heat-J/g*C

• Temperature Change-*C

When two samples of similar mass are subjected to the same heat energy, the sample with the SMALLER specific heat will have a _________ temperature change.

• SMALLER

• LARGER

• EQUAL

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A chemical reaction in a beaker causes the beaker to feel cold to the touch. What type of reaction occurred?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

Which of these is the unit for specific heat?

• J

• J/g

• J/g^oC

• ^oC

Which type of energy is the energy stored in chemical bonds?

• kinetic energy

• potential energy

• chemical potential energy

• mechanical energy

Tags

NGSS.HS-PS1-4

What is the specific heat of water?

• 2.02 J/g^oC

• 2.05 J/g^oC

• 4.184 J/g^oC

• 41.84 J/g^oC

A piece of aluminum with a mass of 20.0 grams is heated from 30 ^oC to 95 ^oC. If the specific heat of aluminum is 0.904 J/g^oC, how much heat is gained by the aluminum?

• 1717.60 J

• 1175.20 J

• 963.68 J

• 542.4 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A 300 gram sample of a metal is cooled from 120 ^oC to 60 ^oC, and releases 4230 J of energy. What is the specific heat of the metal?

• 7.61 x 10⁷ J/g^oC

• 4.26 J/g^oC

• 0.47 J/g^oC

• 0.235 J/g^oC

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Which of these is a correctly balanced thermochemical equation for the combustion of C₂H₄?

• C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (g)

• 2C₂H₄ (g) + 6O₂ (g) → 4CO₂ (g) + 4H₂O (g)

• C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (g) ΔH_comb= -1411 kJ/mol

• 2C₂H₄ (g) + 6O₂ (g) → 4CO₂ (g) + 4H₂O (g) ΔH_comb= -1411 kJ/mol

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

4Fe(s) + 3O₂(g) → 2Fe₂O₃(s) + 1625 kJ

Is this reaction endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4