Acid and alkali

Properties

Physical change

Chemical change

Physical and Chemical Change

involves changes to the physical properties of a substance without any new substances being formed.

Physical change

Chemical change

Produces one or more new substances, which have different physical and chemical properties from the original substance.

Reactant- the original substanceProduct- new substance formed

Physical change

Condition Chemical change

No Is there any new substance formed?

Yes

Yes Is the change reversible?

No (not always)

Yes, changes in the physical properties

Are there any changes in the properties of the original substance?

Yes, changes in both chemical and physical properties

Chemical Equation

• Chemical equations are used to describe chemical reactions.

• They tell us about the reactants that are involved, as well as the products that are formed at the end of the reaction.

Carbon dioxide + Glucose + Oxygen

Light

Chlorophyll

Reactants Carbon dioxide and water

Products Glucose and oxygen

Conditions Light and chlorophyll

Homework:

Bring 3 tablets of ANTACID ( antacil, etc.)Salt water ( if possible)Salt