AQA GCSE Chemistry Topic 3 Chemical Calculations

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19 Terms

1

What is conservation of mass?

mass of products=mass of reactants

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2

What is a multiplier?

number put infront of a substance

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3

What is Mr

Relative atomic mass

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4

What other than mass must be the same in reactants and in products?

Mr

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5

Why may there appear to be a change in mass?

Gas

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6

Why does the mass go up when a metal oxide is produced?

Gas

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7

What is lost in thermal decomposition?

CO2

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8

Define mole

amount of substance

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9

What is the symbol for moles?

mol

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10

What is the mass of 1 mole in grams?

Mr

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11

What is the name of the constant that describes how many atoms molecule or ions every mole has?

Avogadro's

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12

What is Avogadro's number?

6.02 x 10^23

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13

What does mass equal using moles and Mr?

Mr*moles

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14

What is the limiting reactant?

The first reactant which is fully used up

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15

What are reactants that aren't fully used up referred as being in?

excess

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16

What is yield?

amount of product obtained

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17

Yield Formula

amount made/theoretical amount

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18

What is the units for concentration?

mol/dm^3

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19

What are all moles of gas at 20°c at 1 atmosphere?

24dm^3

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