chem test unit 1 grade 10
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What is a compound
A compound is a substance made from two or more different elements that are chemically bonded together.
what is a mixture
A mixture is a combination of two or more substances
what is Homogeneous Mixture
You can’t see the different layers - Salt in water (it’s mixed so well, you can’t see the salt).
what is heterogeneous Mixture
You can see the separate parts Example: Salad (you can see the veggies and dressing separately).
chemical change
-new colour that isn’t supposed to happen -bubbles of gas -heat or light
Physical change
textural change, shape, size, color, volume and density.
reactive perodic table
Metals: Most reactive → Group 1 (Alkali metals), increasing as you go down the group. Non-metals: Most reactive → Group 17 (Halogens), increasing as you go up the group. Noble gases: Least reactive.