Thermochemistry and Kinetics

What does m stand for?

• Heat-Joules

• Mass-Grams

• Specific Heat-J/g*C

• Temperature Change-*C

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

Is this reaction endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

Is the reaction represented in this graph endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

A sample of H₂O with a mass of 60 grams boils until it has completely changed to steam. How much heat was absorbed?

H_fus = 334 J/g

H_vap = 2260 J/g

• 7525 J

• 135,600 J

• 1112.1 J

• 20,040 J

Tags

NGSS.HS-PS3-1

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

Which of these is the unit for specific heat?

• J

• J/g

• J/g^oC

• ^oC

Which of these would indicate that particles of a substance can be in three different phases on a phase diagram?

• critical point

• triple point

• phase section

• solid line

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