Chemistry

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  • Created by: Elizabeth
  • Created on: 19-05-13 15:18
what is relative atomic mass?
Ar, usually the SAME number as the MASS NUMBER
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what is relative formula mass?
Mr, the ATOMIC MASSES added together
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the equation for moles...
number of moles= mass in grams/ Mr (of element or compound)
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the mass of an element in a compound...
percentage mass of an element= Ar x No. of elements/ Mr x 100
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how to measure percentage yeild...
percentage yeild= actual yeild(grams)/ percentage yeild x 100
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what is a reversible reaction?
A REVERSIBLE REACTION is one where the products of the reaction can REACT THEMSELVES to produce ORIGINAL REACTANTS
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what is gas chromotography?
GAS CHROMOTOGRAPHY can seperate out a mixture of compound and help you identify the substance present
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the rate of reaction depends of 4 things...
1. temperature 2. concentration 3. catalyst 4. surface area of solids
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measuring the rate of reaction..
rate of reaction= amount of reactant used or amount of product formed/ time
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reaction can be measured in...
precipation (quicker disappeared, faster the reaction) change in mass (quicker the reading drops, quicker the reaction) volume in gas ( more gas given off, faster the reaction)
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the decomposition of hydrogen peroxide...
2H2 02(aq) 2H2 0 (l) + 02 (aq)
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what is a catalyst?
A CATALYST is a substance which SPEEDS UP a reaction without being CHANGED or USED UP in the reaction
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A high temperature increases...
collisions
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what is an exothermic reaction?
A EXOTHERMIC REACTION is one which TRANSFERS ENERGY to the surroundings usually in the form of HEAT and usually shown by a RISE IN TEMPERATURE (combustion)
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what is an endothermic reaction?
An ENDOTHERMIC REACTION is one which TAKES IN ENERGY from the surroudings, usually in the form of HEAT and usually shown by a FALL IN TEMPERATURE (thermal decomposition)
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what happens to the reactions?
if the reaction in ENDOTHERMIC it goes in ONE DIRECTION, if it is EXOTHERMIC it goes in the OTHER DIRECTION
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what is an acid?
an acid is a substance with a pH of less than 7
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what is a base?
a base is the substance with a pH greater than 7
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what is an alkaline?
an alkaline is a base that disolves in water
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what is the equation for neutralisation?
acid + base ---> salt + water
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what is the equation for acids reacting with metals?
acid+ metal ---> salt +hydrogen
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what is AMMONIA?
AMMONIA disolves in water to make an alkaline solution
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what is ELECTROLYSIS?
if you pass an electric current through ionic substances that molten or in solution, it breaks down into elements its made of
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what does electrolysis require?
electroysis requires liquid to conduct electricity, called the ELECTROLYTE
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Oxidation and Reduction...
Oxidation Is Loss- Reduction Is Gain
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Other cards in this set

Card 2

Front

Mr, the ATOMIC MASSES added together

Back

what is relative formula mass?

Card 3

Front

number of moles= mass in grams/ Mr (of element or compound)

Back

Preview of the back of card 3

Card 4

Front

percentage mass of an element= Ar x No. of elements/ Mr x 100

Back

Preview of the back of card 4

Card 5

Front

percentage yeild= actual yeild(grams)/ percentage yeild x 100

Back

Preview of the back of card 5
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