Chemistry S2

Question 1

What so all chemical reactions produce

Answer 1

New Substances
Reactant +Reactant ➡️products

Question 2

What is the sign for solid

Answer 2

s

Question 3

What is the sign for liquid

Answer 3

l

Question 4

Whats the sign for Gas

Answer 4

g

Question 5

What does aqueous mean

Answer 5

(A substance desolved in water)

Question 6

Whats the sign for Aqueous

Answer 6

aq

Question 7

What is a exothermic reaction

Answer 7

An reaction where energy is given out .

Question 8

What will happen to the temperature of the mixture in a exothermic reaction

Answer 8

The temperature of the reaction mixture will increase!

Question 9

What is a endothermic reaction

Answer 9

Energy taken in

Question 10

What will happen to the temperature of the substance during an endothermic reaction?

Answer 10

The temperature of the reaction mixture will descrese

Question 11

What is electrolysis

Answer 11

It is when electricity can be used to separate compounds into the elements they contain

Question 12

What is a fuel

Answer 12

A fuel is a chemical which burned to release energy

Question 13

What is combustion

Answer 13

Term used to describe the burning of a fuel in the presence of oxygen

Question 14

What happens when a fuel burns

Answer 14

It reacts with oxygen in the air

Question 15

How much oxygen is in the air

Answer 15

21% oxygen,78% nitrogen and 1% other gases

Question 16

What is the test for oxygen

Answer 16

Relights a glowing splint !

Question 17

Combustion of carbon

Answer 17

Carbon reacts with oxygen in the air to form carbon dioxide

Carbon(s) + Oxygen(g) → Carbon dioxide(g)

Question 18

Test for carbon dioxide

Answer 18

Carbon dioxide gas turns limewater milky

Question 19

What are the 2 types of combustion

Answer 19

Complete combustion and Incomplete combustion

Question 20

What is there is a lot oxygen in the air to burn carbon what will this produce and what kind of combustion is it

Answer 20

It will produce Carbon dioxide(g) and will be complete combustion

Question 21

What does incomplete combustion make

Answer 21

Carbon Monoxide

Question 22

What does complete combustion make?

Answer 22

Carbon dioxide

Question 23

What is a carbon monoxide

Answer 23

Colourless odourless toxic gas

Question 24

Combustion of hydrogen equation

Answer 24

Hydrogen(g)+Oxygen(g)➡️water(l)

Question 25

Test for hydrogen

Answer 25

Hydrogen gas burns with a squeaky pop

Question 26

What are fossil fuels

Answer 26

Coal,Oil and natural gases are all fossil fuels

Question 27

When and where fossil fuels formed

Answer 27

Millions of years ago from the remains of living things

Question 28

When did the formation of coal start

Answer 28

350million years ago

Question 29

Where did coal start to form

Answer 29

Where there was extensive plant growth in places like flooded forests and swamps

Question 30

Coal formation what happened

Answer 30

When fern like trees died they fell into swamps and could not decay completely so they turned into a layer of peat then layers of mud and earth covered the peat and burying and compressing it

Question 31

Coal formation what happened after the peat was covered

Answer 31

As the layers built us and compressed it even further the pressure increased so did the temperature which eventually turned the peat into coal

Question 32

What does finite mean

Answer 32

Limited

Question 33

Combustion of fossil fuels how do fossil fuels undergo combustion

Answer 33

With oxygen in the air

Question 34

The products of combustion are?

Answer 34

Carbon dioxide and water

Question 35

What is a HYDROCARBON

Answer 35

Molecules that consist of carbon and hydrogem ONLY

Question 36

What is crude oil

Answer 36

Contains a mixture of hyrdrocarbons

Question 37

(1)Oil and gas formation when did it happen and where

Answer 37

Oil and natural gas were formed more than 100 million years ago in seas or lakes that had a lot of plankton

Question 38

(2)Oil and gas formation what happened next

Answer 38

The plankton died and sank to the bottom of the sea

Question 39

(3) oil and gas formation? what happened after the plankton sunk

Answer 39

The dead plankton covered with layers of sand and mud at the bottom

Question 40

(4) oil and gas formation what happened after they where covered

Answer 40

As the layers built up the high temperature and pressure formed oil and natural gas

Question 41

(5) oil and gas formation what happened after the high pressure and high temperature

Answer 41

Once the oil and natural gas had formed they started to migrate upward and became trapped in layers of impermeable rock

Question 42

(6)oil and gas formation what happened after the oil and gas came up

Answer 42

The oil and gas accumulated to form oil fields and gas fields