Chemistry unit 2

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Which ion makes a solution acidic?
H+
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Which ion makes a solution alkaline?
OH-
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What is the ionic equation for neutralisation?
H+ + OH- -> h20
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If you neutralise hydrochloric acid which type of salt would you get?
Chloride
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Why do positive ions go to the cathode?
The cathode is negative and opposites attract.
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Why do negative ions go to the anode?
The anode is positive and opposites attract.
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What is reduction?
Making something smaller
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What is oxidation?
The gaining of oxygen
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Why do ionic compounds not conduct electricity as a solid?
The ions are not free to move around like in liquids and solids.
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Why do ionic compounds conduct electricity as liquids or in solution?
The ions are free to move around so can gain electricity and pass it on.
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Why do ionic compounds have high melting points?
They have high melting points because they are strong therefore allot of heat and energy is needed to break the bonds.
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Why do simple covalent molecules exist as gases?
They are weak bonds so can be easily broken without the need of allot of energy.
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What is a precipitate and how do you spot one?
when a solid is produced as a result of a reaction, this can be spotted as if it is a solid then the liquid will go cloudy.
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How do you get salt crystals from a solution?
Evaporation
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How do you remove insoluble substances?
filterisation
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What does the group number tell us about an atom?
The number of elsectrons in the outer shell
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What is electrolysis?
chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
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Name four ways of increasing the rate of a reaction
Temperature, concentration, catalyst and surface area
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What is a catalyst?
A substance which increases the rate of a reaction
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Why do thermo softening polymers melt when heated?
Polymer chains can uncoil and move
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Why do thermosetting polymers NOT melt when heated?
They are joined together by cross links so they can't move
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What is a mixture of metals called?
An alloy
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Why are alloys harder than pure metals?
The atoms in alloys are different sizes therefore making the bonds harder and stronger.
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Why does diamond have a high melting point?
It's made up of strong covalent bonds
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Why does graphite (and all metals) conduct electricity?
The electrons have freedom to move so pass on energy to each other as they collide
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what is an isotope?
Atoms of the same element that have different numbers of neutrons
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What is a covalent bond?
The sharing of electron pairs between atoms
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Why can graphite be used as a lubricant?
The layers slide over each other easily because there are only weak forces between them
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Other cards in this set

Card 2

Front

Which ion makes a solution alkaline?

Back

OH-

Card 3

Front

What is the ionic equation for neutralisation?

Back

Preview of the front of card 3

Card 4

Front

If you neutralise hydrochloric acid which type of salt would you get?

Back

Preview of the front of card 4

Card 5

Front

Why do positive ions go to the cathode?

Back

Preview of the front of card 5
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