Question

key concept check

1. contrast: what is the difference between chemical and physical properties?

Explanation:

A physical change alters the form or appearance of a substance without changing its chemical composition. For example, melting ice is a physical change as water changes from solid to liquid but is still H₂O. A chemical change results in the formation of new substances with different chemical properties. For instance, burning wood is a chemical change as it produces ash, carbon - dioxide, etc. with new chemical identities.

Answer:

A physical change only affects physical properties like state, shape, etc., without changing the chemical makeup of a substance. A chemical change results in the formation of new substances with different chemical properties.