Compounds S1

Question 1

What is a Element?

Answer 1

An element is made from atoms of the same type.

Question 2

What is a Compound?

Answer 2

A compound is two or more elements chemically bonded together.

Question 3

How is a compound formed?

Answer 3

When chemicals join together.

Question 4

What is a mixture?

Answer 4

A mixture consists of two or more different substances, not chemically joined together.

Question 5

What are 3 examples of mixtures?

Answer 5

Air, Sea water, Salt and water.

Question 6

What do compounds ending in IDE contain?

Answer 6

Two elements.

Question 7

What do compounds ending in ATE or ITE contain?

Answer 7

Oxygen in addition to other elements.

Question 8

What elements are present in Magnesium Oxide?

Answer 8

Magnesium and Oxygen.

Question 9

What elements are present in Iron Carbonate?

Answer 9

Iron, Carbon and Oxygen.

Question 10

What are the starting substances in a word equation called?

Answer 10

Reactants

Question 11

What are the new substances we end up with called in a word equation?

Answer 11

Products

Question 12

What do we use to show what it changes in to in a word equation?

Answer 12

An arrow (not an equals sign)

Question 13

What does solute mean?

Answer 13

It’s a substance that dissolves in a liquid.

Question 14

What does solvent mean?

Answer 14

It’s the liquid that a solute dissolves in.

Question 15

What is a solution?

Answer 15

A Solution is formed by dissolving a substance in a liquid.

Question 16

What does soluble mean?

Answer 16

A soluble substance will dissolve.

Question 17

What does insoluble mean?

Answer 17

A substance that does not dissolve in liquid is insoluble.

Question 18

What would sugar be?

Answer 18

A Solute.

Question 19

What would water be?

Answer 19

A solvent.

Question 20

What is formed by dissolving a substance in a liquid?

Answer 20

A solution.

Question 21

If the substance dissolves when I put it in the solvent what would it be?

Answer 21

Soluble

Question 22

If the substance doesn’t dissolve when I put it in the solvent, what would it be?

Answer 22

Insoluble.

Question 23

What are two separating techniques ?

Answer 23

Filtration and Evaporation (Distillation)

Question 24

What is Filtration used to separate?

Answer 24

Filtration is used to separate an insoluble solid from a solution.

Question 25

What is Evaporation used to separate?

Answer 25

Evaporation is used to separate a soluble substance from a liquid.

Question 26

What is Evaporation?

Answer 26

The water boils, evaporates and leaves the salt in the evaporating basin.

Question 27

What is the residue?

Answer 27

The residue is the solid left on the filter paper.

Question 28

What is the filtrate?

Answer 28

The filtrate is the liquid which passes through the filter paper.

Question 29

What is distillation?

Answer 29

Distillation is a method of separating two liquids. It works on the basis that each liquid will have a different boiling point.

Question 30

What are the three stages of distillation?

Answer 30

Boiling, Condensing and Collecting.

Question 31

What is Distillation used to separate?

Answer 31

Two liquids.

Question 32

What are the 7 steps of Distillation?

Answer 32

1. A Solution of ink is put into a flask and heater.
2. Water in the solution evaporates changing from a liquid to steam.
3. Steam rises to the top of flask.
4. Steam passes through the cold Liebig condenser.
5. Steam cools and condenses back into water.
6. Pure liquid water is collected in the beaker.
7. A blue/black solid is left behind in the flask.

Question 33

What is Chromotography?

Answer 33

Forensic scientists use the technique called chromatography to separate a mixture of compounds.

Question 34

What is Chromatography used for?

Answer 34

Chromatography can be used to separate out inks. Each ink is made up of a different combination of colours.