GCSE Science Unit 1 Chemistry

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Petrol has a lower boiling point than diesel. Explain why.
Petrol has a weaker intermolecular force that diesel.
1 of 10
Nitrogen monoxide, NO, reacts with oxygen, O2. Nitrogen Dioxide, NO2 is made. Write down the balanced symbol equation for this reaction.
2NO + O2 --- NO2.
2 of 10
Chemists are developing new types of polymers that are biodegradable and soluble in water. Explain why chemists are developing these new types of polymers.
Less litter, less need for landfill sites, new uses for polymers can be developed.
3 of 10
Explain how emulsifiers help stop water and oil from separating.
An emulsifier has a hydrophilic end that is attracted to water and a hydrophobic end that is attracted to oil, stopping the water and oil from separating
4 of 10
Potato is easier to digest when cooked. Explain why.
It is easier to digest when cooked as the cell walls rupture so that enzymes can easily come into contact with starch inside the cell and then the starch grains swell up and spread out.
5 of 10
What is a saturated hydrocarbon?
It only contains carbon to carbon single bonds.
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GORE-TEX fabric is waterproof but also breathable. Explain why.
The holes in PTFE are too small for liquid to pass through but the holes are big enough to let water vapour out.
7 of 10
Protein molecules change shape when meat is cooked. What is the name of this process?
Denaturing.
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Explain why the amount of fossil fuels used worldwide is increasing every year.
The worlds population is increasing and some countries such as china and India have growing economies.
9 of 10
Propane (C3H8) burns completely in oxygen. Write the balanced symbol equation for this reaction.
C3H8 + 5O2 --- 3CO2 + 4H2O.
10 of 10

Other cards in this set

Card 2

Front

Nitrogen monoxide, NO, reacts with oxygen, O2. Nitrogen Dioxide, NO2 is made. Write down the balanced symbol equation for this reaction.

Back

2NO + O2 --- NO2.

Card 3

Front

Chemists are developing new types of polymers that are biodegradable and soluble in water. Explain why chemists are developing these new types of polymers.

Back

Preview of the front of card 3

Card 4

Front

Explain how emulsifiers help stop water and oil from separating.

Back

Preview of the front of card 4

Card 5

Front

Potato is easier to digest when cooked. Explain why.

Back

Preview of the front of card 5
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