matter

Matter is made of up more than 100 difference substances called elements

An element is a substance that cannot be broken down into any other substance

Elements are represented by one or two letter symbols Elements are represented by one or two letter symbols. For example O is for ____________ and Ca is for ______________. Oxygen calcium

Particle theory explains that all matter is made of atoms

When atoms combine, they form molecules

A substance made of two or more elements that are chemically combined in a set ratio is a compound

A compound is represented by a chemical formula, which shows the elements and the ratio of atoms. For example, carbon dioxide is: CO2 (two oxygen atoms for every one carbon atom)

A ____________ is made of two or more substances that are together in the same place but their atoms are not chemically bonded. mixture

Name two types of mixtures:

Distillation, filtration, magnetic attraction, evaporation are methods used to __________ mixtures. separate

filter Separating Mixtures #1 Solids can be separated from liquids by pouring the mixture though a: filter

Separating Mixtures #2 Liquids can be separated from each other by heating them up to a temperature at which one of the liquids boil. Distillation (used for many commercial purposes: distilled water, alcohol, paraffin, kerosene)

magnet Separating Mixtures #3 Iron objects can be separated from a mixture using a magnet

evaporation Separating Mixtures #4 When salt water is left in open air, only salt will be left in the container after a time. This is an example of: evaporation