Unit 5

Question 1

exothermic reactions

Answer 1

Energy is given out to the surroundings
Temperature of the surroundings increases

Question 2

Endothermic reactions

Answer 2

Energy is taken in from the surroundings
Temperature of the surroundings decreases

Question 3

In n exothermic reaction graph)

Answer 3

The energy of the products is lower than the reactants

Question 4

In a endothermic graph

Answer 4

The energy of the products is higher than of the reactants

Question 5

Chemical reactions occur so that

Answer 5

elements can achieve a more stable energy state by gaining a full outer shell of electrons

Question 6

Where is the energy transferred in a exothermic reaction

Answer 6

This energy is transferred from the chemical energy store of the chemical system to the surroundings and so the energy of the system falls - this means that the energy change is negative

Question 7

Types of exothermic reactions

Answer 7

CON

Combustion, oxidation, and neutralisation

Question 8

Real life examples of exothermic

Answer 8

Self-heating cans of food and drinks such as coffee and hot chocolate , hand warmers

Question 9

How is endothermic reactions transferred

Answer 9

This energy is transferred to the chemical energy store of the chemical system and so the energy of the system increases - this means the energy change is positive

Question 10

Types of endothermic reactions

Answer 10

ETDP

Electrolysis, thermal decomposition reactions and the first stages of photosynthesis

Question 11

Types of endothermic reactions real life

Answer 11

Sports injury treatments often use cold packs based on endothermic reactions to take heat away from a recently injured area to prevent swelling