Forensics

Question 1

Wht is main gas for causing acid rain

Answer 1

Sulphur dioxide

Question 2

What can acid rain do

Answer 2

Kill animals and plants

Question 3

Where does acid rain come from

Answer 3

Factory chimneys

Question 4

How can acid rain be reduced

Answer 4

Using catalytic converters in cars
Changing to greener methods
Cleaning chimneys in factories

Question 5

What two diseases can be caused from acid rain

Answer 5

Asthma and bronchitis

Question 6

How does acid rain get to other countries

Answer 6

Gets blown by winds

Question 7

What helps make acid rain

Answer 7

Cars

Question 8

What gas comes out cars

Answer 8

Nitrogen oxide

Question 9

What is mixing slats and forming others called

Answer 9

Salt swap over

Question 10

What is the first part of a salt

Answer 10

Metal part

Question 11

What is the second part of a salt

Answer 11

Acid root

Question 12

What is sodium chloride

Answer 12

Food salt

Question 13

What is Calcium carbonate

Answer 13

Chalk

Question 14

What are soluble salts

Answer 14

Salts that can dissolve or evaporate

Question 15

Name an insoluble salt

Answer 15

Calcium carbonate

Question 16

Name 3 soluble salts

Answer 16

Sodium chloride
Calcium chloride
Sodium carbonate

Question 17

How do you do salt swapover

Answer 17

Mix together solutions of two salts and funnel it. The salt that doesnt funnel is a different salt because it is insoluble and the salt that does funnel is different because the acid has been swapped over

Question 18

What is paper chromatography

Answer 18

A method for separating liquids from one another

Question 19

Why is chromatography helpful to forensic scientists

Answer 19

Helps them find out what pen wrote a note at a crime scene

Question 20

What is used for separating inc using chromatography

Answer 20

Filter paper with a dot of inc on it
1 cm of ethanol
The filter paper is putin the ethanol to separate the inc

Question 21

What are the two phases in chromatography

Answer 21

Stationary phase and mobile phase

Question 22

What is a mobile phase

Answer 22

The liquid or gas that moves materials over stationary phase

Question 23

What is stationary phase

Answer 23

The piece of paper in chromatography

Question 24

What do carbonates produce when reacted with acid

Answer 24

Carbon dioxide

Question 25

How do u test for a carbonate

Answer 25

Add acid to the salt and bubble has given off through limewater, if the limewater goes cloudy then it is a carbonate

Question 26

How do you test for a chloride

Answer 26

Add some silver nitrate to salt and look for a precipitate

Question 27

What is a precipitate

Answer 27

A solution formed into a solid

Question 28

How do you test for a sulphate

Answer 28

Add some barium nitrate and look for precipitate

Question 29

How do you find out the metal part in a salt

Answer 29

Mix with acid and burn to see what colour the flame is because that tells you what metal it is

Question 30

What does flame tests do

Answer 30

Finds out the metal prt of a salt

Question 31

What does a pH scale do

Answer 31

Easures how strong or weak an acid or alkali is

Question 32

Why is testing pH helpful

Answer 32

It is useful in forensics for comparing and matching samples

Question 33

What does 1 on a pH chart mean

Answer 33

A very strong acid

Question 34

What dies 14 mean on a pH scale

Answer 34

A very strong alkali

Question 35

How do we test the pH of soil samples

Answer 35

Mix soil with water, then filter and add universal indicator to filtrate. Match the colour of the filtrate with the pH chart to find out what it is

Question 36

Why would a country be very likely to produce acid rain

Answer 36

Has very big industries and lots of factories

Question 37

What happens when industries grow

Answer 37

They produce more pollution

Question 38

How does sulphur dioxide get into the rain

Answer 38

Comes out factory chimneys and dissolves into rain