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Chemisty
C3 - Quantitative Chemistry
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Cards (21)
What does the conservation of mass state in a chemical reaction?
The total mass of all
substances
is conserved.
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Why must we balance chemical equations?
To ensure that the
atoms
that go in must come out.
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What is relative formula mass?
It is the sum of the
relative atomic masses
of all atoms in a
compound
.
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How do you calculate the relative formula mass of CO2?
By adding
12
and 2 times
16
, which equals
44
.
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What happens to the mass of reactants when a gas product leaves the reaction vessel?
It results in a seeming
decrease
in mass of the reactants.
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What is a mole in chemistry?
A mole is a specific number of
atoms
or
molecules
.
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How is the concept of moles useful in chemistry?
It allows us to compare amounts of substances.
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How many grams of a substance equal one mole?
The mass in grams is equal to its
relative atomic or formula mass
.
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What does the stoichiometry of a reaction indicate?
It indicates the ratio of
moles
of one
substance
to another in a reaction.
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How many grams of water are produced from 64 g of methane reacting completely with oxygen?
144
g of water is produced.
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What is the process to convert from mass to moles and back?
Mass → Moles → Mass using the formula moles =
grams
/
Rams
.
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What is a limiting reactant?
It is the reactant that runs out first in a reaction.
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How is concentration of solutions often expressed?
In
grams per decimetre cubed
(g/dm³).
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What does a concentration of 1 mole per decimetre cubed mean?
It means one mole of
solute
is dissolved in one decimetre cubed of solution.
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What is percentage yield in a chemical reaction?
It tells you how much product is actually made compared to the
theoretical
amount.
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How do you calculate percentage yield?
Percentage yield = (
actual yield
/
theoretical yield
) × 100.
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What is atom economy?
It tells you how much of a
desired product
you get out of a reaction compared to the mass of the
reactants
.
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How do you calculate atom economy?
Atom economy = (
RAM
of
desired product
/ total RAM of
reactants
) × 100.
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What is the volume occupied by one mole of any gas at room temperature and pressure (RTP)?
It occupies a volume of
24 decimetres cubed
.
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How do you convert moles to volume for gases?
By multiplying or dividing by 24.
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What are the key concepts related to chemical reactions and stoichiometry?
Conservation of mass
Balancing equations
Relative atomic and formula mass
Moles and their calculations
Limiting reactants
Concentration of solutions
Percentage yield
Atom economy
Volume of gases at RTP
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