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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
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How can you separate a liquid from a liquid?
Chromatography
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What are E numbers?
Codes for chemicals which can be used as food additives for use within the EU.
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State one advantage of chromatography?
Highly accurate and sensitive and they are quicker.
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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.
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What do we call the filter paper after the chromatography experiment has ended?
Chromatogram
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What colours are present in blank inks?
All colours
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What does the Rf value represent?
Distance compound travels up chromatogram
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What does GC-MS stand for?
Gas Chromatography – Mass Spectrometry
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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
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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)
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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
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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.
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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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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

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