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Elements, Compounds, Mixtures….a little review. Elements Pure _________; cant be broken down simpler substances by _________ means are arranged in order.

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Presentation on theme: "Elements, Compounds, Mixtures….a little review. Elements Pure _________; cant be broken down simpler substances by _________ means are arranged in order."— Presentation transcript:

1 Elements, Compounds, Mixtures….a little review

2 Elements Pure _________; cant be broken down simpler substances by _________ means are arranged in order _________(# of p+) on the Periodic Table each made of one type of _________ Look around the room for some! Aluminum (Al), Argon (Ar), Zinc (Zn), Nitrogen (N), Carbon (C), Gold (Au)

3 Hydrogen is the simplest element and makes up over 90% of all matter our universe!

4 Compounds Pure substance composed of atoms of two or more _____________ Ex. water (H 2 O), ________________, table salt (NaCl) _____________________ by physical means; can only be separated by chemical means Held together by ______________(ionic, covalent, metallic, etc.)

5 Why form compounds? Atoms like to be stable and happy; they want full _________________ Some atoms have full shells and are already happy being alone (__________- He, Ar, Ne, etc.) ___________dont have full shells- they fill their shells by combining with other types of atoms Na +1 + Cl -1 NaCl

6 Molecule The ______________________that can exist Some examples: –Water H 2 O –Carbon monoxide CO –Hydrochloric acid HCl

7 How do compounds combine and/or break down? By a chemical reaction (substance is changed into something else)- this causes a chemical change in the substance Ex. Hydrogen and Oxygen combine to form water 2H 2 + O 2 2H 2 O Another example is rust: 4Fe + 3O 2 2Fe 2 O 3

8 Mixtures Combo of two or more substances; not pure; are ________ but not ___________combined May be separated by _______means- evaporation, filtration, magnets, picking out pieces, etc. Exist in any phase- liquids (ethanol & gas); liquid/gas (Coke®); solids (taco salad); gas/solid (smoke)

9 Heterogeneous mixture -_____________________; least mixed -___________particles -___________to separate -examples: salad dressing, your sock drawer, cereal

10 Homogeneous mixture -have a __________________________ A.K.A. solutions ex. saltwater, bronze, air, mixed ___________ particles are ___________distributed

11 Physical changes Physical change- may involve a change in state (ex. solid to liquid), or change in size, shape Examples of physical changes are filtering, evaporation, ripping paper, melting, dissolving –The makeup of the object is unchanged (ex. ripped paper is still paper)

12 Chemical Changes Chemical change- new substance is formed; products are different from the reactants Ex. of chemical changes are: burning, dissolving w/ acid, rusting, passing an electrical current through something


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