Chemical Changed Ch 2

Question 1

Chemical change

Answer 1

Change is irreversible most of the time
Bonds between molecules break up and reform

Question 2

Indicators of chemical change (5)

Answer 2

1- change in colour
2- new gas formed
3- light emission
4- tempature change
5- solid ( precipitate ) formed

Question 3

Synthesis

Answer 3

Formation of complex molecule with simple molecules

Question 4

Oxidation

Answer 4

Réaction with oxygen
Releases energy

Question 5

Cellular respiration, decomposition

Answer 5

Opposite of photo synthesis
Breaking down of complex molecules to simple molecules

Question 6

Précipitation

Answer 6

Formation of solid
Ex: cheese curds