C5 Booklet( Topic 5)

Question 1

Define an exothermic reaction

Answer 1

An exothermic reaction is one that transfers energy from the reacting chemicals to the surrounding area.

Question 2

Define an endothermic reaction

Answer 2

An endothermic reaction is one that transfers energy from the surrounding area to the reacting chemicals.

Question 3

Activation energy

Answer 3

The minimum energy needed for a reaction to take place.

Question 4

Give the charge for the overall energy change for an endothermic reaction

Answer 4

Negative

Question 5

Give the charge for the overall energy change for an exothermic reaction

Answer 5

Positivé

Question 6

Give the reaction type when the energy of the products is lower than the energy of the reactants

Answer 6

Exothermic

Question 7

Give the reaction type when the energy of the products is higher than the energy of the reactants

Answer 7

Endothermic

Question 8

Give an example of an exothermic reaction

Answer 8

Fireworks, combustion, self heating cans, hand warmers, Respiration

Question 9

Give an example of an endothermic reaction

Answer 9

Thermal decomposition, ice packs, photosynthesis

Question 10

How are covalent bond held together?

Answer 10

Electrostatic attraction between shared pair of negatively charged electrons and positively charged nuclei.