What is meant by chemical change?

Answer 1

Chemical ChangesAs opposed to a physical change, chemical changes are present when the substance undergoes a chemical reaction and produces a new substance. A chemical change is a chemical reaction that will always take place for there to be a chemical change. Signs that a reaction is taking place: Formation of gases (bubbles), Color change, production of heat or light, and the formation of a solid.

• a change in composition and characteristics of matter.
• new substance maybe formed.
• original substance and form may be lost.
• new color and shape

Examples

• Fermentation
• Photosynthesis
• Rusting nail
• Spoiling milk
• Digesting food

Answer 2

A chemical change is a process in which one or more substances are converted into different substances with different chemical properties. This usually involves the breaking and forming of chemical bonds. Examples include rusting of iron and baking a cake.

Answer 3

The definition of a chemical change is that it describes which changes are possible for a substance.

A change in which one or more substances combine or break apart to form new substances.

Answer 4

A chemical change is change where one thing becomes something else. In other words, the atoms and molecules combine, break apart (molecules only), or reaarange themselves. For example, when hydrogen gas chemically combines with oxygen gas in a 2:1 ratio, we get water which is something very different than either gases. Another example is burning things. During burning, the compounds in what is being burned combine with oxygen from the atmosphere. Think of paper, if you tear it it's still paper right? But if you burn it, it becomes water, carbon dioxide, smole and ash (carbon). Chemical changes require chemical reactions.

Answer 5

A change involving changes in the chemical composition of the reactants.

Answer 6

a change which cannot be reverse and which takes internally but chemically is called chemical reaction

such as burning.

Answer 7

chemical change is changes color,size,shape etc.

Answer 8

chemical change is the change of one substance into another substance.

Answer 9

The chemical change modify the molecular structure of a substance; a new molecule is formed.