Chemistry Equations

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Atomic Number
Number of protons in the nucleus of an atom of an element.
1 of 16
Mass Number
number of protons + number of neutrons in the nucleus of an atom of an element.
2 of 16
Relative Atomic Mass
total mass of 100 atoms/100
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Relative Formula Mass
total sum of all the relative atomic masses of all the atoms present in the formula
4 of 16
Mass of one mole
relative atomic mass expressed in grams
5 of 16
Calculating mass from amount
mass of substance = amount x Mr
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Calculating amount from mass
amount in moles = mass of substance/Mr
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Calculating volume of gas from amount of gas
volume of gas (in dm ) = amount x 24
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Calculating amount of gas from the volume of gas
amount of gas (in moles) = volume of gas x 24
9 of 16
Empirical Formula
Amount of atoms = mass/Ar = (no/1)
10 of 16
Calculations involving concentrations of solutions
amount of dissolved substance (in mol) = volume of solution x concentration of solution (mol/dm )/1000
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Percentage Yield
yield obtained/theoretical yield x 100
12 of 16
Electrolysis Calculations
quantity (in coulumbs) - current (amperes) x time
13 of 16
Percentage of oxygen air
percentage of oxygen = volume of oxygen used/volume of air at start x 100
14 of 16
Measuring heat energy change during reactions of solutions
heat given out = mass of solution x specific heat capacity of solution x temperature rise
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Rate of reaction
rate = change of concentration of reactant/time
16 of 16

Other cards in this set

Card 2

Front

number of protons + number of neutrons in the nucleus of an atom of an element.

Back

Mass Number

Card 3

Front

total mass of 100 atoms/100

Back

Preview of the back of card 3

Card 4

Front

total sum of all the relative atomic masses of all the atoms present in the formula

Back

Preview of the back of card 4

Card 5

Front

relative atomic mass expressed in grams

Back

Preview of the back of card 5
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