Chemistry Unit 1a

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  • Created by: Emily
  • Created on: 16-04-13 19:28

What is a Hydrocarbon?

It is a compound which contains only carbon and hydrogen atoms.

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What is the general formula for alkanes?


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How can alkenes be described?


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How can alkanes be described?


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The most viscous hydrocarbons are likely to leave.

The bottom

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Which gas is not formed by the combustion of hydro

Oxygen is not formed by the combustion of hydrocarbons.

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Which gas is mainly responsible for acid rain?

Sulfur dioxide

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What is caused by the release of carbon dioxide in

Global warming

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What are the products of complete combustion of a

carbon dioxide and water

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Incomplete combustion can produce black particles

Incomplete combustion can produce black particles of carbon.

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Bioethanol is a biofuel. This means that it:

Comes from plant material

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Which process allows large hydrocarbons to be brok


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Which hydrocarbon is unsaturated and why?

Alkenes are unsaturated because they have double bonds.

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What happens when an alkene is mixed with bromine

The bromine water changes from orange to colourless

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In the displayed formula for an alkene, = represen

A double covalent bond

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What is formed when ethene reacts with steam?


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In the reaction, ethene ==> poly(ethene) ...what i

Ethene is the monomer.

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Why can polymers be difficult to dispose of?

They do not break down easily.

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What is the formula for ethanol?


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What is one of the advantages of making ethanol by

One of the advantages of making ethanol by fermentation is the raw material is a renewable resource.

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Where are vegetable oils found?

 In seeds, nuts and some fruit

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What do unsaturated oils tend to be like at room t

Unsaturated oils tend to be liquid at room temperature.

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Which chemical is needed to harden vegetable oils?


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What conditions are needed for hydrogenation?

60°C and a nickel catalyst are needed for hydrogenation.

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What is mayonnaise an example of?

An emulsion

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Vegetable oils have higher boiling points than wat

Food can be cooked at higher temperatures in oil than it can in water.

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Starting with the centre of the Earth, what is the

Core, mantle, crust

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What causes tectonic plates to move?

Convection currents in the mantle

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At what rates do tectonic plates move per year?

A few centimetres per year

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What crude oil fraction is used as a fuel for airc


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Crude oil contains many compounds. The compounds a


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What type of reaction is cracking?

Thermal decomposition. 

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The alkene with 3 carbon atoms is called


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Alkenes can be used for..?

To make polymers.

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What is the test for alkenes?

Bromine water.

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What is the symbol for carbon monoxide?


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What compound is CO?

Carbon Monoxide.

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What is the main gas that is causing global warmin

Carbon Dioxide.

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Which gas in the atmosphere is the main cause of a

Sulphur Dioxide

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Poly(ethene) is used to make..?

Plastic carrier bags.

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The polymer made from ethene is called?


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What will happen when you heat a thermosetting pol

Will stay solid.

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What will happen when you heat a thermosoftening p

Will become liquid.

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Most polymers are not biodegradable. This means th

They will not decompose in soil. 

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In an exothermic reaction, energy is..?

Given out

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What happens during a endothermic process?

Chemical bonds are broken.

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The word equation for fermentation is..?

Yeast+Glucose ----->CarbonDioxide+Alcohol.

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A mixture of water and alcohol can be seperated by

Fractional Distillation 

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What will a catalyst do to the rate of the reactio


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What happens to a catalyst in a reaction?

It is not used up.

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What does a catalyst do to the activation energy i

It decreases the activation energy for the reaction.

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What type of catalyst is an enzyme?

A biological catalyst.

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What is an isomerase?

The enzyme which converts glucose into fructose. 

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How was crude oil formed?


  • Sea animals died and sank to bottom of sea where they were buried.
  • Bodies did not decay as no oxygen for bacteria to survive.
  • Remains placed under high temperatures and high pressures.
  • Process takes millions of years.
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What is fractional distillation?

The process of seperating crude oil.

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