Chemistry cards made during HT.

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What are the disadvantages of bioleaching?
It is a slow process, and it contributes to acid rain
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What temperature does bitumen boil at?
350 degrees celsius.
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What does a metal and water produce?
Metal hydroxide + hydrogen
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Why does concrete become harder with age?
-Water evaporates -Calcium reacts with Carbon dioxide in the air to form Calcium Carbonate
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What does the group number tell you?
How many electrons are in the outer shell.
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What does the period number tell you?
The number of shells and element has.
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What is an element?
An element is made up of only one single type of atom.
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Give 2 properties of alloys
-Strong -Corrosion Resistant
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Why are alloys stronger than pure metals?
The regular atom arrangement is disrupted in an alloy, preventing the atoms from sliding over one another.
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Fill in the missing word(s): Incomplete combustion releases ________________
Carbon Monoxide
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What is phytomining?
Using plants that absorb metal from the ground they grow. The metal is stored in the leaves, and then the plant is burnt to extract the metal.
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Why must equations be balanced?
So that no atoms are lost or gained during a chemical reaction.
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Where has all the Co2 from the early atmosphere gone?
It has been: -Absorbed by plants -Absorbed into the ocean -Absorbed into rocks.
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What causes global dimming?
Carbon particles released from burning fossil fuels
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What does viscosity mean?
How thick a substance is.
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What does volatility mean?
How easily a substance vapourises.
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Give 3 properties of short chain alkanes.
Any 3 from; -Low boiling point -Very runny -Highly flammable -Very volatile
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Give 3 properties of long chain alkanes
Any 3 from; -High boiling point -Very viscous -Smoky flame -Not very volatile
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Give 2 advantages of using ethanol as a biofuel
-Ethanol burns cleanly -Ethanol is renewable.
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Describe the process of cracking.
A catalyst is heated to around 600 degrees Celsius. The alkanes is heated and it vapourises. The vapours pass over the catalyst and thermal decomposition occurs.
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Why are alkenes known as 'unsaturated?'
Because the double bond can open up and let other elements join on (this is why they decolourise bromine water)
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How do alkanes burn?
They produce H2O and CO2.
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Give one disadvantages of cooking with oils
Any 1 from; -High in energy because fossil fuels absorb oils so it can lead to obesity/heart disease. -It raises your cholestrol levels.
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Fill in the missing word(s): The gas in the atmosphere today is mostly __________
Nitrogen (78%)
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Other cards in this set

Card 2

Front

What temperature does bitumen boil at?

Back

350 degrees celsius.

Card 3

Front

What does a metal and water produce?

Back

Preview of the front of card 3

Card 4

Front

Why does concrete become harder with age?

Back

Preview of the front of card 4

Card 5

Front

What does the group number tell you?

Back

Preview of the front of card 5
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