Thermo and Gases Review

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

• -200 KJ

• 200 KJ

• 400 KJ

• -300 KJ

How much activation energy is needed for this reaction?

• 300 KJ

• 500 KJ

• 400 KJ

• 100 KJ

Are the products or reactants of this reaction storing more energy in their chemical bonds? (higher y value means more energy)

• Both storing the same

• No way to tell

• Products

• Reactants

What type of reaction is this?

• Exothermic

• Endothermic

• Energy Producing

• No way to tell

What type of reaction occurs in a hand warmer

• exothermic
• endothermic

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?

• It is an exothermic reaction
• It is an endothermic reaction