Evidence of Chemical Reactions

1
Evidence of Chemical Reactions
2
Physical Properties
A property that can be observed, measured or
changed without changing the substance itself
3
Chemical Properties
The ability of a substance to change into a new
substance with different properties
Poisonous Gas
Explosive Powder
Table Salt


4
Evidence of Chemical Reactions

• Temperature Change
• Heat is absorbed by the substances causing the
  temperature to decrease
• Heat is released by the substances causing the
  temperature to increase

SMOKE
5
Evidence of Chemical Reactions

• Fizzing
• When a gas is formed it may try to escape causing
  bubbles

6
Evidence of Chemical Reactions
Chemical Change

• Color Change
• This is evidence of a chemical reaction only when
  the other properties have also changed.

Not a Chemical Change
7
Evidence of Chemical Reactions

• Precipitate Formed
• Precipitate is a solid substance formed when
  liquids are combined

8
Evidence of Chemical Reactions

• Light
• When a new substance is formed light energy can
  be produced.