Heat and ThermoChem Review

In an endothermic reaction the system is releasing energy.

• True
• False

What type of reaction is shown in the picture?

• endothermic
• exothermic

What kind of equation is this: 2KI + MgCl₂ + 200KJ ----> 2KCl + MgI₂

• Endothermic

• Exothermic

C₂H₄ + 3O₂ → 2CO₂ + 2H₂O + 1411 kJ

Given the balanced equation for the combustion of C₂H₄, how much heat energy will 5Liters of C₂H₄ make?

• 955

• 315

• 249

• 735

• 114

A catalyst works by

• changing the order of the reaction
• increasing the temperature
• lowering the activation energy
• making the activated complex

What is the Heat is given off in this reaction?

• 200 KJ

• 400 KJ

• 500 KJ

• 300 KJ

How much activation energy is needed for this reaction?

• 300 KJ

• 500 KJ

• 400 KJ

• 100 KJ

If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal?

• 2.34 J/g°C

• 0.472 J/g°C

• 6.13 J/g°C

• 0.163 J/g°C

20 g of water. specific heat of water is 4.18 J/g°C.  temperature changes from 25° C to 20° C, how much heat energy (q) moves from the water to the surroundings?

• 418 J

• 210 J
• 80 J
• 4.18 J

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