AP Chemistry Thermochemistry

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-PS3-4

Which of these processes is endothermic?

• freezing

• condensation

• deposition

• sublimation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

NGSS.HS-PS3-4

Which of these is the unit for specific heat?

• J

• J/g

• J/g^oC

• ^oC

Which of these statements is true?

• At the critical point on a phase diagram, a gas can no longer be changed to a liquid due to an increase in pressure.

• On a phase diagram you will find particles in three phases on a solid line segment.

• All substances have the same phase diagram.

• The normal boiling and melting points are found at 100 ^oC on a phase diagram.

Tags

NGSS.HS-PS3-4

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

Tags

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

A 95 gram volume of water has an initial temperature of 30 ^oC. A piece of metal with a mass of 120 grams and an initial temperature of 98 ^oC is placed in the water. The final temperature of the water and the metal is 35 ^oC. What is the specific heat of the metal?

• 7560 J/g^oC

• 3.80 J/g^oC

• 0.263 J/g^oC

• 1987.4 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