C5 chemistry

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  • Created by: ikrolivia
  • Created on: 25-10-15 08:31
What is a mole?
The amount of substance in a chemical reaction
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Mg(OH)2 mole example
Mg 1x24 / O 2x16 / H 2x1 // = 24 + 32 + 2 = 58g/mol
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What might the mass measured at the end of a reaction be?
greater if a gas has been gained from the air // OR less if water vapour or a gas has escaped
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What is meant by 'empirical formula'?
Simplest whole number ratio of each type of atom in a compound
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What can concentration be measured in?
g/dm3 OR mol/dm3
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In a concentrated solution, the particles are...
...CLOSER TOGETHER than a dilute solution
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What must you do to convert a volume?
from cm3 to dm3, divide by 1000 / from dm3 to cm3, multiply by 1000.
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GDA stands for..?
Guideline daily amount
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When an acid & alkali react, it's known as..?
Neutralisation reaction
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Neutralisation equation
acid + alkali --> salt + water
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Single indicators e.g. litmus do what at end of titration?
Produce a sudden colour change
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Indicators change colour depending on whether they're...
...in acidic or alkaline solutions
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What's the apparatus needed to collect&measure volume of a gas?
Unturned measuring cylinder, gas syringe, upturned burette
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Method for measuring volume of a gas
measure reactants / add reactants together in conical flask / start stopwatch / record volume of gas made at regular time intervals until volume stops increasing
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The reactant that's used up first is called the...
limiting reactant
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Uses of sulfuric acid include..?
Paints, soaps, fibres, plastics, fertilisers
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What is the 'contact process'?
When sulfur, air and water are made into sulfuric acid
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The equilibrium can be moved to the right of the reaction equation by:
adding more reactant OR removing the product as it's made
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The equilibrium can be moved to the left of the reaction equation by:
reducing reactant OR increasing amount of product
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Strong & weak acids
Strong acid = ionises completely in water / Weak acid = partially ionises
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The greater concentration of H2 ions in an acid...?
The greater the electrical conductivity as ions carry charge
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Ethanoic acid or hydrochloric acid react with:
Mg to make h2 gas // CaCO to make co2 gas
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How is a precipitate formed?
mixing 2 ionic solutions together / it's formed when ions from 1 solution collide with ions from the other / form insoluble compound
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What are halides?
Ions made by halogens (group 7 elements)
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Other cards in this set

Card 2

Front

Mg(OH)2 mole example

Back

Mg 1x24 / O 2x16 / H 2x1 // = 24 + 32 + 2 = 58g/mol

Card 3

Front

What might the mass measured at the end of a reaction be?

Back

Preview of the front of card 3

Card 4

Front

What is meant by 'empirical formula'?

Back

Preview of the front of card 4

Card 5

Front

What can concentration be measured in?

Back

Preview of the front of card 5
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