Chemical and Physical Changes

A transformation in which new substances with different properties are formed.  Example: rusting of iron.

• chemical change

• physical change

• decomposition reaction

• solubility

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.

• chemical change

• physical change

• decomposition reaction

• solubility

Tags

NGSS.MS-PS1-5

A transformation in a substance's appearance or state without altering its chemical composition. Sometimes the changes can be undone.  Example: melting ice.

• chemical change

• physical change

• decomposition reaction

• solubility

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

• matter

• mass

• volume

• solubility

Tags

NGSS.MS-PS1-4

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. 

• matter

• mass

• volume

• solubility

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

• matter

• mass

• volume

• solubility

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

• combustion

• solubility

• corrosion

• decomposition reaction

Tags

NGSS.MS-PS1-5

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.

• combustion

• solubility

• corrosion

• decomposition reaction

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

• combustion

• solubility

• corrosion

• decomposition reaction