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Chemistry S2 Module 2 > Chemistry S2 > Flashcards

Chemistry S2 Flashcards

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1
Q

What so all chemical reactions produce

A

New Substances
Reactant +Reactant ➡️products

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2
Q

What is the sign for solid

A

s

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3
Q

What is the sign for liquid

A

l

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4
Q

Whats the sign for Gas

A

g

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5
Q

What does aqueous mean

A

(A substance desolved in water)

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6
Q

Whats the sign for Aqueous

A

aq

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7
Q

What is a exothermic reaction

A

An reaction where energy is given out .

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8
Q

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

A

The temperature of the reaction mixture will increase!

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9
Q

What is a endothermic reaction

A

Energy taken in

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10
Q

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

A

The temperature of the reaction mixture will descrese

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11
Q

What is electrolysis

A

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

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12
Q

What is a fuel

A

A fuel is a chemical which burned to release energy

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13
Q

What is combustion

A

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

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14
Q

What happens when a fuel burns

A

It reacts with oxygen in the air

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15
Q

How much oxygen is in the air

A

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

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16
Q

What is the test for oxygen

A

Relights a glowing splint !

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17
Q

Combustion of carbon

A

Carbon reacts with oxygen in the air to form carbon dioxide

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

18
Q

Test for carbon dioxide

A

Carbon dioxide gas turns limewater milky

19
Q

What are the 2 types of combustion

A

Complete combustion and Incomplete combustion

20
Q

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

A

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

21
Q

What does incomplete combustion make

A

Carbon Monoxide

22
Q

What does complete combustion make?

A

Carbon dioxide

23
Q

What is a carbon monoxide

A

Colourless odourless toxic gas

24
Q

Combustion of hydrogen equation

A

Hydrogen(g)+Oxygen(g)➡️water(l)

25
Q

Test for hydrogen

A

Hydrogen gas burns with a squeaky pop

26
Q

What are fossil fuels

A

Coal,Oil and natural gases are all fossil fuels

27
Q

When where fossil fuels formed

A

Millions of years ago from the remains of living things

28
Q

When did the formation of coal start

A

350million years ago

29
Q

Where did coal start to form

A

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

30
Q

Coal formation what happened

A

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

31
Q

Coal formation what happened after the peat was covered

A

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

32
Q

What does finite mean

A

Limited

33
Q

Combustion of fossil fuels how do fossil fuels undergo combustion

A

With oxygen in the air

34
Q

The products of combustion are?

A

Carbon dioxide and water

35
Q

What is a HYDROCARBON

A

Molecules that consist of carbon and hydrogem ONLY

36
Q

What is crude oil

A

Contains a mixture of hyrdrocarbons

37
Q

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

A

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

38
Q

(2)Oil and gas formation what happened next

A

The plankton died and sank to the bottom of the sea

39
Q

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

A

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

40
Q

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

A

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

41
Q

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

A

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

42
Q

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

A

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

Chemistry S2 Module 2 (1 decks)

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