Chemical Reactions

By: Allison Brennan

Physical Change

A change that is happening from a chemical form but not to a chemical substance. For an example, it occurs when the sun is melting the popsicle. Which means the SUN is the chemical form and the melting of the popsicle is the non chemical substance.

More examples: Crumpling a sheet of paper or breaking a bottle

Chemical Change

When a form of chemical substance combines with another form of chemical substance to create something new. For an example, it occurs when a lighter lights a fuses and when the fuse burns out, there's a firework. The fire and the fuse are both the chemical substance and the firework is what comes out of it.

More examples: Burning wood or digesting food

Precipitate Change

Cause a situation to happen suddenly or unexpectedly

Example: Leaving milk out making it chunky.

Exothermic Change

A chemical reaction that releases energy in the form of light or heat.

Example: making ice cubes, a candle flame, and rusting water.

Endothermic Change

Is the process or reaction in which the system absorbs energy from it's surroundings in the form of heat.

Example: dissolving ammonium chloride in water