Page 34 - Grade 7 CG

Chemistry Overview

Chemical and physical change
Chemical change
Chemical reactions in the laboratory
Chemical equations
Physical changes
Solutions
Dissolution of solutes into solvents.
Speeding up dissolving.
Different solvents
Factors affecting on rate of solubility.
Separating mixtures
What is a mixture?
Methods of separating mixtures including filtration, evaporation, distillation,
crystallization, decanting, chromatography and use of separating funnel.
Water and solutions
Structure of water molecules.
Heating and cooling water.
Testing for water.
Water supply and problems of pollution in water.
Acid, alkali and neutralization
Define acid and alkali.
Neutralization reactions in laboratory and real life.