8E Water

Question 1

Sea water has

Answer 1

Salt dissolved in it which can make us ill

Question 2

What is a mixture

Answer 2

Lot of things jumbled up together

Question 3

Filtering will separate

Answer 3

A substance which is insoluble from a liquid

Question 4

Filtering process

Answer 4

Filter paper is placed in the funnel which is placed in a conical flask . Filter paper has small holes to let small particles of liquid through but not a solid. The solid that gets left behind is called the residue and the liquid in the flask is the filterate

Question 5

What is a solution

Answer 5

A solid dissolved in a liquid

Question 6

In a solution the liquid is called what and the solid is called what

Answer 6

Solvent

Solute

Question 7

A substance which can dissolve is called

Answer 7

Soluble

Question 8

A substance which can not dissolve is called

Answer 8

Insoluble

Question 9

A solution is always

Answer 9

Transparent

Question 10

The total mass of a solution is

Answer 10

The mass of the solute added to the mass of the solvent

Question 11

When a solution is saturated it

Answer 11

Contains as much dissolved solid as it can

Question 12

Most solids dissolve more when

Answer 12

The solute is hotter

Question 13

We can show water contains other chemicals by

Answer 13

Heating it so that the water will evaporate. And leave the chemicals behind

Question 14

The chenicals which are left behind are called

Answer 14

Salts

Question 15

Water which contains chemicals that stop soap from lathering is called

Answer 15

Hard water the opposite is soft water

Question 16

Common as,t is

Answer 16

Sodium chloride

Question 17

What is chromatography

Answer 17

A way of separating different substances that are dissolved in a solution

Question 18

Process of chromatography

Answer 18

Chromatography paper will have different ink samples on it and will be attached to a rod across a beaker with a little water on it . The water will not touch the ink .

Question 19

Why does chromatography work

Answer 19

Different chemicals are made up of different sized particles . When they are dissolved in a liquid the particles separate out different speeds so are spread out at different instances . Different solvents can also be used

Question 20

Describe how distillation makes pure water

Answer 20

The flask which is getting heated contains inky water . The water then turns into water vapour. It then goes down the inner tube of the Liebig condenser where the water vapour condenses into a liquid and pure water goes inti the bucket . The outer tube of the Liebig condenser is filled with flowing cold water to keep it cool . It has a part at the top to let it out and a part at the bottom to let the cold water in .