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Science 7 Notes 11 Pure Substance 1. Can you distinguish Element between elements, Compound compounds, and Mixture mixtures? 2. Do you know the properties of Non-Metal and non-metals?

Classification of Matter What are 1. Pure Substances elements made  A pure substance is anything that is the SAME throughout. of? One part would seem EXACTLY THE SAME as any other Can elements be broken down? part.

A. Elements Give an example of an element. • Each element is made of a single type of atom

• A pure substance that cannot be BROKEN down into A DIFFERENT substance. • Elements are the building blocks for other substances • There are over 100 known elements

• i.e. , , ,

Elements can be separated into two groups What are the two groups elements are classified as? a. Metals b.  Have a metallic shine Describe the characteristics of  Can be shaped (are  Non-metallic shine metals. malleable)  Usually not malleable Identify one example of a  Are good conductors of heat  Poor conductors of heat metal. and electricity and electricity Describe nonmetals.  i.e. gold, , , Identify one  i.e. carbon, , example of a aluminum, , . oxygen, 1

Science 7 Notes 11 B. Molecules and Compounds What is a molecule? Give Molecules are the combination of two or more NON-METAL an example. elements that are chemically bonded together What is a compound? Give  i.e. atmospheric oxygen-O2 an example.

How does a molecule differ Compounds are the combination of two or more DIFFERENT from a compound elements (including a metal) that are chemically bonded together

Do compounds  i.e. salt-NaCl, KMnO4, KCl have properties that resemble the elements that they are made  There is a chemical formula for each molecule/compound of?  Compounds have properties that are different than the elements that How are molecules and join to make them compounds made or unmade?  Molecules/Compounds can only be made or unmade by chemical

What is a reaction mixture?

Can mixtures be 2. Mixtures separated?

Give an example  Mixtures are substances that are NOT the SAME throughout. of a mixture.  Two or more substances mixed together in any proportion

 Can usually be separated more easily than compounds (it

doesn’t take a chemical reaction)

 Can be separated using a phase change

 i.e. cereal, air, soda, mud, salt

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