Separation techniques and the periodic table

Question 1

where can you find the metals on the periodic table

Answer 1

on the left side

Question 2

What is a mixture?

Answer 2

a mixture is made from different substances that are not chemically combined eg: sand and water

Question 3

What is a solution?

Answer 3

a solution is a mix of two or more substances which have dissolved or mixed to make a solution

Question 4

What is a pure substance?

Answer 4

this is a substance made out of one type of atom

Question 5

How can you tell if something is a pure substance?

Answer 5

they tend to have a lower melting point than mixtures

Question 6

Name 4 ways you can separate a mixture

Answer 6

chromatography, filtration, distillation and evaporation

Question 7

What is evaporation?

Answer 7

evaporation is when a liquid is boiled/heated and the liquid has turned into a gas, it is used to separate a soluble solid from a liquid.

Question 8

What is distillation?

Answer 8

purifying a liquid by evaporating the liquid from the solid by heating and cooling to make it back into a liquid

Question 9

How are evaporation and distillation different?

Answer 9

evaporation is turning the liquid into a gas where as distillation is turning it into a gas and back into a liquid again

Question 10

Describe how to carry out filtration

Answer 10

use filtered paper in a funnel or any other filter and put your mixture in and it will let the liquid pass through and will leave the solids behind

Question 11

Why can’t you separate a solvent from a solute using filtration?

Answer 11

the solute will have dissolved in the solvent making the solid dissolve in the liquid make it a liquid too

Question 12

What is chromatography used for?

Answer 12

this is used to see what coloured felt tips have used other colours to make that colour

Question 13

Describe how to carry out chromatography

Answer 13

get some sort of ink eg: felt tip or food colouring and put them on some paper. tie the paper to a pencil and put the pencil on a glass of water and let the paper just touch the paper and wait for the rusults

Question 14

What are the columns of the periodic table called?

Answer 14

groups

Question 15

What are the rows of the periodic table called?

Answer 15

periods

Question 16

Describe a trend of the group 1 elements

Answer 16

the reactivity of the group 1 elements increase as you go down the group because the atoms become larger

Question 17

Describe a trend of the group 7 elements

Answer 17

the group 7 become less volatile as you go down the group as the molecules become bigger and contain more electrons

Question 18

What is special about group 0?

Answer 18

group 0 is on the right, the last period and they are called noble gasses as they are all chemically unreactive