C7

Question 1

Where is energy conserved

Answer 1

In chemical reactions

Question 2

What does exothermic mean

Answer 2

A reaction in which energy is transfered from the reacting substances to their surroundings

Question 3

What does endothermic mean

Answer 3

A reaction in which energy is transfered to the reacting substances from their surroundings

Question 4

Give examples when exithermic reactions can take place

Answer 4

Used in hand warmers and self heating cans

Question 5

Endothermic examples

Answer 5

Can be used in instant cold packs for sports injuries

Question 6

Is bond breaking endothermic or exothermic

Answer 6

Endothermic

Question 7

In chemical reaction what must be supplied to break the bonds between atoms in the reactants

Answer 7

Energy

Question 8

When new bonds are formed between atoms in a chemical reaction what is released

Answer 8

Energy

Question 9

In an exothermic reaction is the energy released when new bonds are formed greater or smaller than the enerrgy required when bonds are broken

Answer 9

Greater