Exo- and endothermic reactions

Question 1

What is an endothermic reaction

Answer 1

A reaction that absorbs energy from the surroundings so the temperature falls

Question 2

Examples of an endothermic reaction

Answer 2

Sports injury pack

Question 3

What is an exothermic reaction

Answer 3

A reaction that releases energy to the surroundings so the temperature increases

Question 4

Examples of an exothermic reaction

Answer 4

Handwarmers
Self heating cans
Combustion
Respiration

Question 5

Practical for measuring energy changes

Answer 5

Using a polystyrene cup, place 10ml of acid into the cup, which is suspended in a glass beaker (to prevent measuring the outside temperature)
Measure the initial temperature of the acid
Add 5g of alkali to the cup, using a lid to prevent heat loss, and measure the change in temperature using a thermometer
Calculate the temperature change using the initial temperature and change in temperature

Question 6

What is breaking bonds

Answer 6

Endothermic

Question 7

What is forming bonds

Answer 7

Exothermic