Energy Level Diagrams Show if it’s Exo- or Endo- thermic

Question 1

In exothermic reactions, ΔH is…

Answer 1

-ve

Question 2

In endothermic reactions, ΔH is…

Answer 2

+ve

Question 3

Exothermic - which is at a lower energy, the products of reactants?

Answer 3

The products are at a lower energy

Question 4

Exothermic - what does the difference in height represent?

Answer 4

The energy given out in the reaction

Question 5

Exothermic - what does the initial rise in the line represent?

Answer 5

The energy needed to break the old bonds - activation energy

Question 6

Exothermic - What does the graph look like?

Answer 6

Going from top left (reactants) to bottom right (products)

Question 7

See graphs page 60

Answer 7

Ok

Question 8

Endothermic - which is at a higher energy, the products or the reactants?

Answer 8

Products at a higher energy than the reactants

Question 9

Endothermic - what does the difference in height represent?

Answer 9

The energy taken in during the reaction

Question 10

Endothermic - what does the graph look like?

Answer 10

Going from bottom left (reactants) to top right (products)

Question 11

Exothermic - what is the ΔH?

Answer 11

-ve

Question 12

Endothermic -what is the ΔH?

Answer 12

+ve