Elements, Compounds, Mixtures Oh My!

Quick Review … Matter is something that has mass and takes up space. It is made up of atoms which are tiny pieces of matter made up of protons, neutrons and electrons. Atoms are divided up into different types (elements) based on the number of protons it has.

Element: A substance that CANNOT be broken down into simpler substances by chemical means, it is made up entirely of one type of atom

We can find all the different elements on the periodic table.

Molecule: A substance that has two or more atoms joined together by a chemical bond

Examples: Hydrogen gas H2, Oxygen gas O2, Water H2O, Methane CH4

Compound: A substance made up of atoms of two or more different elements joined by chemical bonds

Examples: Carbon dioxide CO2, Glucose C6H12O6

What’s the difference between a molecule and compound?

What’s the difference between a molecule and compound? Compounds have to have at least two different elements bonded together whereas molecules could be the same element bonded together.

Are all compounds molecules?

Are all compounds molecules? Yes, compounds have two or more atoms joined together which is what is required to be a molecule

Are all molecules compounds?

Are all molecules compounds? No, molecules could have the same atoms bonded together and to be a compound they have to be different

Which of these are molecules? Which of these are compounds?

Mixtures: A combination of two or more substances that are not chemically combined

Homogeneous Mixture – is the same throughout Examples: apply juice, tea, sugar water

Homogenous Mixture

Homogenous Mixture

Homogenous Mixture

Homogenous Mixture Salt water

Heterogeneous Mixture – not uniform throughout, has different parts that you can see Examples: soil samples, orange juice with pulp, chicken noodle soup

Heterogeneous Mixture

Heterogeneous Mixture

Heterogeneous Mixture

Heterogeneous Mixture

Brain storm with your shoulder buddy two more examples of each type of mixture.

Solutions: A type of homogenous mixture Solutions: A type of homogenous mixture *Kool-aid is a solution of water, sugar and kool-aid mix

There are two parts to a solution… 1) Solvent – material in which the solute is dissolved *For kool-aid water is the solvent 2) Solute – the substance that is dissolved in the solvent *For kool-aid, sugar and kool-aid mix are the solutes

Practice with the chart on your paper…