chem test unit 1 grade 10

Question 1

What is a compound

Answer 1

A compound is a substance made from two or more different elements that are chemically bonded together.

Question 2

what is a mixture

Answer 2

A mixture is a combination of two or more substances

Question 3

what is Homogeneous Mixture

Answer 3

You can’t see the different layers
- Salt in water (it’s mixed so well, you can’t see the salt).

Question 4

what is heterogeneous Mixture

Answer 4

You can see the separate parts
Example: Salad (you can see the veggies and dressing separately).

Question 5

chemical change

Answer 5

-new colour that isn’t supposed to happen
-bubbles of gas
-heat or light

Question 6

Physical change

Answer 6

textural change, shape, size, color, volume and density.

Question 7

reactive perodic table

Answer 7

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.