physical and chemical change

Question 1

what is physical change?

Answer 1

Change of state, shape, or appearance of matter.
No new substance formed.

Question 2

what is chemical change?

Answer 2

Change in physical and chemical properties.
One or more substance is formed

Question 3

7 indicators of chemical change

Answer 3

Colour change
Substances disappearing
New substances appearing
Bubbling and gas
Temperature changes
Sound and light
Precipitate formation.

Question 4

what is an endothermic reaction?

Answer 4

• taking in heat - gets colder

Question 5

what is an exothermic reaction?

Answer 5

releasing heat - gets warmer

Question 6

what is a product and a reactant?

Answer 6

reactant - what causes the reaction
product - the outcome

Question 7

9 indicators of phyiscal change

Answer 7

Shape change
Mixing
Dissolving
Expansion
Contraction
Melting
Vaporisation
Condensation
Freezing

Question 8

what are physical properties?

Answer 8

a feature of a substance that we can tell with out senses

Question 9

6 types of chemical reaction

Answer 9

combustion (when a substance burns)
combination (a+b - ab)
single displacement (a + bc - ac + b)
double displacement (ab + cd - cb +ad)
decomposition (ab - a + b)

Question 10

what law states that mass in a chemical reaction is neither created nor destroyed

Answer 10

law of conservation of mass