science
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- Created by: jennie123
- Created on: 07-12-14 15:16
Why can gold be found in the Earth's crust in its native state? Gold is very rare. Gold is very unreactive. Gold is more reactive than silver.
Gold can be found in the Earth's crust in it's native state because gold is very unreactive.
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Why is aluminium extracted from aluminium ore by electrolysis? Aluminium is more reactive than carbon. Aluminium is less reactive than carbon. Aluminium is an expensive metal.
Aluminium is more reactive than carbon.
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Why is iron extracted from iron ore by reduction with carbon or carbon monoxide? Iron is more reactive than carbon. Iron is less reactive than carbon. Iron is a cheap metal.
Iron is extracted from iron ore by reduction with carbon or carbon monoxide because iron is less reactive than carbon.
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What happens to iron oxide in a blast furnace? It is oxidised to form iron. It is electrolysed to form iron. It is reduced to form iron.
In a blast furnace iron oxide is reduced to form iron.
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In comparison with steel, what is pure iron like? Harder Magnetic Softer
In comparison with steel, pure iron is softer.
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What is the percentage of iron in the iron from a blast furnace? 100% 96% 4%
There is 96% iron in the iron from a blast furnace.
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Which type of steel is likely to be used for making cutlery? Low carbon steel High carbon steel Stainless steel
Stainless steel is likely to be used for making cutlery.
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What process is used to purify copper? Electrolysis Filtration Reduction in a blast furnace
Electrolysis
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Why is titanium expensive to extract from its ore? It resists corrosion. Several stages are involved. Its ore is rare.
Titanium is expensive to extract from it's ore because several stages are involved in the extraction process.
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Phytomining involves: using plants to absorb metal compounds using bacteria to absorb metal compounds using chemicals to absorb metal compounds
using plants to absorb metal compounds
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Copper can be obtained by reacting solutions of copper compounds with scrap iron. This sort of reaction is called: electrolysis displacement combustion
The reaction is called displacement.
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What do we call the compounds that contain only carbon and hydrogen atoms?Carbohydrates Carbohydrogens Hydrocarbons
Hydrocarbons
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Which of the following describes the top of an oil fractionating column? It's hotter than the bottom of the column. It's colder than the bottom of the column. It's the same temperature as the bottom of the column.
It's colder than the bottom of the column.
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What happens to a liquid during its separation from a mixture by distillation? Condensing followed by evaporating Evaporating followed by condensing Evaporating followed by freezing
Evaporating followed by condensing
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In comparison with large hydrocarbons, how would you describe small hydrocarbons? They are more viscous. They are less flammable. They are more volatile.
They are more volatile.
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What is the general formula for alkanes? CnHn+2 CnH2n+2 CnH2n
CnH2n+2
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What is the general formula for alkanes? CnHn+2 CnH2n+2 CnH2n
Alkanes can be described as saturated.
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Which gas is not formed by the combustion of hydrocarbons? Oxygen Water vapour Carbon dioxide
Oxygen is not formed by the combustion of hydrocarbons.
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Which of these gases is mainly responsible for acid rain? Carbon monoxide Methane Sulfur dioxide
Sulfur dioxide
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What is caused by the release of carbon dioxide into the atmosphere? Global dimming Global warming Ozone depletion
Global warming is caused by the release of carbon dioxide into the atmosphere.
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What causes global dimming? The Sun releasing less energy The Earth moving away from the Sun Particles from burning fuels being released
Particles from burning fuels being released
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Other cards in this set
Card 2
Front
Why is aluminium extracted from aluminium ore by electrolysis? Aluminium is more reactive than carbon. Aluminium is less reactive than carbon. Aluminium is an expensive metal.
Back
Aluminium is more reactive than carbon.
Card 3
Front
Why is iron extracted from iron ore by reduction with carbon or carbon monoxide? Iron is more reactive than carbon. Iron is less reactive than carbon. Iron is a cheap metal.
Back
Card 4
Front
What happens to iron oxide in a blast furnace? It is oxidised to form iron. It is electrolysed to form iron. It is reduced to form iron.
Back
Card 5
Front
In comparison with steel, what is pure iron like? Harder Magnetic Softer
Back
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