Changes of matter

Chemical changes

When a substance creates a different substance with new chemical properties.

When a substance creates a different substance with new chemical properties.

Endothermic/Exothermic changes

Refers to a chemical change where
a substance either requires or gives
off heat as a reaction to form chemicals.

Endothermic: In this GIF, the bread(specifically the yeast) absorbs the heat to make it rise and expand.

Endothermic: In this GIF, the bread(specifically the yeast)
absorbs the heat to make it rise and expand.

Exothermic: Coal gives off energy when put in fire, causing it to make the fire burn more intensely.

Exothermic: Coal gives off energy when put in fire, causing it to make the fire burn more intensely.

Forming bubbles/Fizzing

When a substance is put in another substance with liquid properties it can cause bubbles to form and a fizzing sound due to gas escaping the liquid.

Soon after the Mento is put in the soda, the gas explodes out the bottle and bubbles form rapidly.

Soon after the Mento is put in
the soda, the gas explodes out the
bottle and bubbles form rapidly.

Precipitation

When a substance is put in another substance with liquid properties, and the result is an insoluble mixture that sinks
to the bottom of a container.

A solution from a solute and solvent, when separated, will form an un-mixable solid at the bottom of the container

A solution from a solute and solvent,
when separated, will form an un-mixable
solid at the bottom of the container

Decomposition

When a substance breaks down into
smaller products.

The food in this GIF disintegrates and releases small matter particles (i.e sugars, oxygen, carbon dioxide).

The food in this GIF disintegrates
and releases small matter particles
(i.e sugars, oxygen, carbon dioxide).

Colour change

A colour change alone actually indicates a physical change only. However, if 2 substances are mixed and there's a colour
change and a substance being formed, it counts as a chemical change.

The 2 purple and blue liquids turn yellow and pink when the substance is put in them, but more smoke is being created, indic

The 2 purple and blue liquids
turn yellow and pink when the
substance is put in them, but
more smoke is being created,
indicating a chemical change

Matter makes up everything in the
universe, and takes up space
around us. Matter can undergo
either physical or chemical changes.
Read on to learn more!

Physical changes

These are changes to the form of a substance, but not the actual composition. These changes are always reversible in some way

These are changes to the form of a substance, but not the actual composition. These changes are always reversible in some way.

Freezing, melting and boiling

These describe the exact temperature when matter changes state into a solid, liquid and gas.

This diagram shows what happens to water when its frozen, melted and boiled.

This diagram shows what happens to water when its frozen, melted and boiled.

Dissolving

The act of a substance mixing with another to create a new mixture.

This sugar cube is mixing with the water compeltely, creating a white sugar-water mixture

This sugar cube is mixing with
the water compeltely, creating a white
sugar-water mixture

Chopping

Decreasing the physical size of a substance,
usually with something sharp.

In this GIF, someone is using a knife to cut a cucumber, reducing the overall size of the cucumber

In this GIF, someone is
using a knife to cut a cucumber,
reducing the overall size of the cucumber