CHAPTER 3: EXPLORING DIVERSITY OF MATTER BY ITS CHEMICAL COMPOSITION

Question 1

What is an element?

Answer 1

An element is the basic building block of matter and cannot be broken down into simpler substances

Question 2

What is a compound? Give an example.

Answer 2

A compound is made up of 2 or more elements that are chemically combined and have a fixed proportion. H2o(hydrogen and water)

Question 3

solid-gas

Answer 3

sublimation

Question 4

oxygen-

Answer 4

oxide

Question 5

sulfur

Answer 5

sulfide

Question 6

iodine

Answer 6

iodide

Question 7

chlorine

Answer 7

chloride

Question 8

flourine

Answer 8

flouride

Question 9

bromine

Answer 9

bromide

Question 10

what are reactants?

Answer 10

the starting materials

Question 11

what are products?

Answer 11

the new substance(s) produced from the reaction

Question 12

What are physical changes? Give examples. Are they reversible?

Answer 12

Physical changes is when there is a change in the physical appearance of a substance like changing of state. Yes some physical changes are reversible meaning the change can be undone and the substance goes back to how it is.

Question 13

What is a chemical change? Give examples. Are they reversible?

Answer 13

When new substances are created from the change like when there is a colour change, light, heat or gas is produced. They are usually not reversible as the chemical properties of the substances has already changed.

Question 14

sodium chloride-

Answer 14

sodium+chlorine= salt

Question 15

calcium carbonate-marble

Answer 15

calcium, carbon, oxygen

Question 16

what are the properties of compounds?

Answer 16

compounds have different properties from their constituent elements.

Question 17

what are mixtures?

Answer 17

mixtures are more than 2 elements or compounds that are not chemically combined.

Question 18

What are the properties of mixtures?

Answer 18

They have the same characteristics as their constituent compounds/elements

Question 19

what is a solution?

Answer 19

a solution is a mixture where a substance(solute) is dissolved in another substance.(solvent)

Question 20

What is a solution with a low % of dissolved solute called?

Answer 20

diluted solution

Question 21

What is a solution with a high % of dissolved solute called?

Answer 21

concentrated solution

Question 22

What are substances that are able to be dissolved in a solvent called?

Answer 22

Soluble

Question 23

What are substances that are not able to be dissolved in a solvent called?

Answer 23

Insoluble

Question 24

What factors affect the rate of dissolving?

Answer 24

The temperature of the solvent, size of solute particles, amount of solvent, rate of stirring

Question 25

what is malleability?

Answer 25

when something is able to shaped or extended

Question 26

what are suspensions? give examples.

Answer 26

a suspension is a mixture that contains insoluble substances in a solvent like dirty water.

Question 27

what do you call it when insoluble substances in a suspension settles to the bottom of the container?

Answer 27

Solid deposits

Question 28

What happens when you shine a light through a solution?

Answer 28

Light is able to pass through it fully.

Question 29

What happens when you shine a light through a suspension?

Answer 29

light is unable to fully pass through it.

Question 30

can particles in a solute be seen?

Answer 30

No

Question 31

can insoluble substances be seen?

Answer 31

yes