Thermochemistry Review

Temperature is a measure of average [blank] energy of individual atoms.

• heat

• potential

• mechanical

• kinetic

ΔH value in an endothermic reaction is a positive number.

• True

• False

A catalyst works by

• changing the order of the reaction

• increasing the temperature

• lowering the activation energy

• making the activated complex

What type of reaction is shown in the reaction pathway?

• endothermic reaction

• exothermic reaction

As 120 g of hot milk cools in a mug, it transfers 20, 000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 2.6 J/g·°C. (Q=mcΔT)

• 64 °C

• 1.56 °C

• 640 °C

• cannot be determined

If 100 g of aluminum at 145ºC gains 6,800 J of heat, what is the final temperature (T_final) of the aluminum? Aluminum has a specific heat of 0.897 J/gºC. (Q=mcΔT)

• -69°C

• 0.52°C

• 221°C

H₂ + ½ O₂ --> H₂O + 285kJ is an example of a(n)

• Electrical equation

• Heat equation

• Thermochemical equation

How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0^oC to 50.0^oC? the specific heat of aluminum is 0.900J/g^oC

• 450

• -450

• 225

• -225

C+ O₂ --> CO₂ + 60kJ, what is the value for ΔH for the reaction?

• +60

• -60

• there is no way to know

How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0^oC to 50.0^oC? the specific heat of aluminum is .900J/g^oC

• 450

• -450

• 225

• -225