Section 12 - Endothermic and Exothermic Reactions

Question 1

Describe the heat transfer in exothermic reactions

Answer 1

Heat energy is given out (the room temperature rises).

Question 2

Describe the heat transfer in endothermic reactions

Answer 2

Heat energy is taken from the surroundings (the room temperature drops)

Question 3

Does it take or release energy to break bonds?

Answer 3

It takes energy to break bonds

Question 4

Does it take or release energy to break bonds?

Answer 4

Energy is released when bonds are made

Question 5

What makes a reaction endothermic?

Answer 5

In a reaction, if more energy is taken in to break bonds than is given out when bonds are made, the process is endothermic - it will take in heat energy

Question 6

What is the overall enthalpy change of an endothermic reaction?

Answer 6

Positive

Question 7

What makes a reaction exothermic?

Answer 7

If more energy is given out when bonds are made than is taken in when bonds are broken, the process is exothermic - it will give out heat energy.

Question 8

What is the overall enthalpy change of an exothermic reaction?

Answer 8

Negative

Question 9

In an endothermic reaction, do the products or reactants have more energy?

Answer 9

Products

Question 10

In an exothermic reaction, do the products or reactants have more energy?

Answer 10

Reactants