science quiz

Compounds are made up of

2 or more elements chemically combined

Ex-salt (NaCl) water (H2O)

Elements are made up of only

One type of atom

Ex- anything on the periodic table

Homogenous mixtures

Have an appearance described as the same throughout

Ex- salt water tea

Heterogenous mixtures

Have an appearance described as not uniform (the same) throughout

Ex- pizza Salad

Solute

The substance that dissolves

dissolve

Mixing of a substance in liquid

Solution

The homogenous mixture formed when a substance dissolves in it

Solvent

Substance that dissolves the solute and is present in the greatest amount, usually a liquid

Physical property

A characteristics of a substance that can be observed or measured without changing the identity of a substance

Physical changes include

Melting/freezing bending crumbling/slicing evaporating and dissolving

Chemical changes include

Rusting heat/temp flames/flammability rotting reacting

Physical property and chemical property include

Physical property- density color and boiling point

Chemical property – flammability and reacting with water

Chemical property

A chemical property describes the ability of a substance to undergo a specific chemical change or reaction

Evidence that a chemical change has occurred

Production of a gas odor light or a change in color or temperature or the formation of precipitate, which is when you get a solid

pH scale

Physical change

Required to change pure substances like elements or compounds in a mixtures

Chemical change

Required to change elements into compound or compounds in elements