Give the term for the undesirable change in the physical, chemical or biological properties of our environment.

Environmental pollution is undesirable change in the physical, chemical or biological characteristics of air, water or soil. It is caused by production and accumulation of wastes which may be industrial or domestic or agricultural or commercial. So the safe disposal of these wastes is essential to prevent environmental pollution. Answer the following questions related to managment of wastes: Differentiate between incineration and pyrolysis.

Define physical change and chemical change.

Give general physical properties of non-metals.

Give general chemical properties of non-metals.

Give the term for change of Spermatid into Sperm.

Give the chemical properties of water.

Is photosynthesis is a chemical change or a physical change?

Why do elements in the same group have similar physical and chemical properties ?