Chemical and Physical Changes

The amount of matter in an object, measured in grams or kilograms. It’s different from weight in which gravity does not affect it. Gravity affects weight.

• mass

• decomposition reaction

• chemical change

• matter

• physical change

A reaction creates a new substance with different characteristics. It is usually not reversible. You might see a color change or notice a gas being produced. An example is when iron rusts.

• chemical change

• physical change

• decomposition reaction

• matter

• mass

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The ability of a substance to dissolve in another substance, usually a liquid like water. Example: You can keep adding salt to water until it reaches a point where it won’t dissolve.

• solubility

• chemical change

• physical change

• matter

• decomposition reaction

Anything that occupies space and has mass, existing in three states—solid, liquid, and gas.

• decomposition reaction

• physical change

• mass

• chemical change

• matter

Tags

NGSS.MS-PS1-4

A change where a complex substance breaks down into simpler substances. Example: Baking soda breaks down into water, carbon dioxide, and other substances, when exposed to heat or an acid.

• mass

• physical change

• matter

• chemical change

• decomposition reaction

The gradual breaking down or discoloration of materials due to chemical reactions with the environment.

• chemical change

• matter

• corrosion

• decomposition reaction

• physical change

A change to how a substance looks or a change to the state of matter it is in. It does not change what it is. The change is often reversible. Example: melting ice.

• physical change

• chemical change

• decomposition reaction

• matter

• mass

Tags

NGSS.MS-PS1-4

A rapid chemical reaction between a substance and oxygen, often producing heat and light.

• combustion

• chemical change

• decomposition reaction

• physical change

• matter

Tags

NGSS.MS-PS1-5

The amount of space occupied by an object or substance, measured in cubic units.

• decomposition reaction

• physical change

• matter

• chemical change

• volume