More Chemistry

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How can you separate a solid from a liquid?
Filtering
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How can you separate a liquid from a gas?
Take the lid off
2 of 42
How can you separate a liquid from a liquid?
Chromatography
3 of 42
What are E numbers?
Codes for chemicals which can be used as food additives for use within the EU.
4 of 42
State one advantage of chromatography?
Highly accurate and sensitive and they are quicker.
5 of 42
State one disadvantage of chromatography?
Equipment is very expensive, it takes specialist training to use and results can ONLY be analysed by comparison with known data.
6 of 42
What do we call the filter paper after the chromatography experiment has ended?
Chromatogram
7 of 42
What colours are present in blank inks?
All colours
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What does the Rf value represent?
Distance compound travels up chromatogram
9 of 42
What does GC-MS stand for?
Gas Chromatography – Mass Spectrometry
10 of 42
Give an example of a typical carrier gas in a GC-MS?
He (or) N (or) H
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What is the period of time a gas remains in the column of a GC-MS called?
Retention time
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What's one use for chromatography?
Money and cheques can be proven as fakes
13 of 42
For a reaction to occur why is energy supplied?
To break bonds
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Why is energy released during a reaction?
Bonds are made
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If more energy is supplied than released is the reaction exothermic or endothermic?
Endothermic
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If a reaction is endothermic will the surroundings get warmer or colder?
Colder
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A reaction requires a lot of heat to take place, it is endothermic or exothermic?
Endothermic
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Is breaking bonds an endothermic or exothermic process?
Endothermic
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If a reversible reaction is endothermic in 1 direction what must it be in the other?
Exothermic
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What equipment can be used to measure the mass of a product?
Scales
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In terms of reactants how do we know when a reaction is completed?
There are no reactants remaining
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State 2 ways in which a reaction can be followed?
Amount of product formed and amount of reactant used.
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How do catalysts effect the rate of reaction?
Speeds it up
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How does increasing temperature effect the rate of reaction?
Rate increases as frequency and energy of collisions increases.
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How does decreasing the concentration effect the rate of reaction?
Rate decreases as only the frequency of collisions decreases.
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How does grinding up solid calcium carbonate into a powder change the rate of reaction?
Rate increases as the surface area is increased, therefore increasing the frequency of collisions increases.
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What scale is used to measure how acidic or alkaline a substance is?
pH scale
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What in the name and formula of the acid that can be used to make magnesium chloride from magnesium ribbon?
Hydrochloric acid (HCl)
29 of 42
What is the definition of an acid?
Acids give H+ in water
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What is the difference between an alkali and a base?
Alkalis are soluble bases and give OH- in water.
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What gas is formed when an acid reacts with a metal?
Hydrogen
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How can we test for hydrogen?
Squeaky pop (heard when a flam is brought near).
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Why can’t ionic solids conduct electricity?
Ions cannot move
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What is the name given to the positive electrode?
Anode
35 of 42
What is a compound split up into using electrolysis?
Elements
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What is the solution or melt that is electrolysed called?
Electrolyte
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What ions are present in calcium iodide and which electrode would each ion go to?
Ca would go to the cathode, I- would go to the anode.
38 of 42
What is the chemical formula of salt in the sea?
NaCl
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What are the 3 products made when brine undergoes electrolysis? Give a use of each one.
Hydrogen, chlorine, sodium hydroxide
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What ions move towards the anode?
Negative ions
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What ions move towards the cathode?
positive ions
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Other cards in this set

Card 2

Front

How can you separate a liquid from a gas?

Back

Take the lid off

Card 3

Front

How can you separate a liquid from a liquid?

Back

Preview of the front of card 3

Card 4

Front

What are E numbers?

Back

Preview of the front of card 4

Card 5

Front

State one advantage of chromatography?

Back

Preview of the front of card 5
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