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Chemistry S2 > Module 2 > Flashcards

Module 2 Flashcards

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1
Q

How can chemical reactions be identified

A

By energy changes

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2
Q

Define exothermic reactions

A

Exothermic reactions release energy to the the surroundings so the products have less chemical energy than the reactants

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3
Q

Define the term endothermic

A

ENDOTHERMIC reactions take in energy from the surroundings

so the products have more chemical energy than the reactants.

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4
Q

What is a reactant

A

The substances that react to together to make the products

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5
Q

What is the term product

A

A product is the results of the reactants reacting together

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6
Q

What is a fuel

A

A fuel is a substance which is burned to release energy

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7
Q

What is the composition of air

A

Nitrogen- 78%
oxygen - 21%
Argon - 0.9%
Carbon dioxide - 0.0038

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8
Q

What is another word for burning

A

Combustion

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9
Q

What happens when a substance burns

A

It reacts with oxygen

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10
Q

What is the test for oxygen

A

It relights a glowing splint

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11
Q

What happens when carbon reacts with oxygen

A

It produces carbon dioxide

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12
Q

What is the test for carbon dioxide

A

It turns lime water milky/cloudy

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13
Q

When can carbon monoxide be produced

A

When carbon burns in an insufficient supply of oxygen

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14
Q

What is carbon monoxide

A

A toxic gas

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15
Q

What happens when hydrogen reacts with oxygen

A

Hydrogen reacts with oxygen to produce water

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16
Q

What is the test for hydrogen

A

It burns with a squeaky pop

17
Q

What is hydrogen hailed as

A

Hydrogen is hailed as a fuel of the future

18
Q

What are fossil fuels

A

Coal, oil, gas

19
Q

When and how were coal and oil and gas were formed

A

Coal, oil and gas were formed from the remains of plant and

animal organisms that lived millions of years ago

20
Q

What do oil and gas burn to produce

A

They burn to produce carbon dioxide

21
Q

What do crude oil and natural gas mainly consist of

A

Compounds called hydrocarbons

22
Q

What two elements do hydrocarbons contain

A

Hydrogen and carbon

23
Q

What dose the word finite mean

A

It means there is a limited supply of it and we will run out

Chemistry S2 (4 decks)

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