What is a chemical change?

Answer 1

A chemical change is a change in which a substance turns into a completely different substance that can't be reversed. A chemical change often happens when a substance burns (not to be confused with evaporation or melting of a substance), changes colors, a substance spoils or rusts, photosynthesis or respiration, and/or a substance tarnishes.

Some examples are a bike rusting, burning bread to make toast, fireworks exploding, milk spoiling, a leaf changing color, mixing eggs and flour for a batter, baking a cake, etc.

A chemical change will NOT dissolve, go through a state of matter (sublimation, decomposition, melting, freezing, evaporation, and condensation), breaking or tearing of a substance, and/or anything that can be reversed back.

A chemical change is one in which one or more new substances are formed. Simple examples include burning and rusting.

Answer 2

A chemical change is a process by which a new form of matter is produced from the constituent elements' atoms. It is a "rearrangement" of matter into new substances which have new properties.

Answer 3

The change which is somewhat permanent and which changes all property of the substances is called chemical change. For example. Burning of magnesium ribbon, Cooking of food etc

Answer 4

a chemical change has a firm definition.A chemical change is when a object or substance meets an entirely new substance.Its different from a physical change because it alters the chemicals and a physical change alters the physical appearance of the substance or object.

Example:bread when toasted has the sugars altered giving it that rough feel.