Chemical changes involve the formation of new substances with different properties.

Examples include rusting, burning, and cooking.

Change in color, temperature, or odor.

Formation of a precipitate or gas.

Release or absorption of energy.

Reactants combine to form products.

Conservation of atoms and mass.

Balanced chemical equations.

Rate of reaction and factors affecting it.

Oxidation-reduction reactions.

Acid-base reactions.

Precipitation reactions.

Combustion reactions.

Decomposition reactions.

Synthesis reactions.

Chemical reactions in manufacturing processes.

Production of fuels, plastics, and pharmaceuticals.

Optimization of reaction conditions.

Pollution from chemical reactions.

Effects on ecosystems and human health.

Sustainability considerations.

Food digestion and metabolism.

Cleaning and sanitation processes.

Medications and healthcare.

Use of chemical products and materials.