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Paper 1
C3
Conservation of mass
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Joanna S
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Cards (3)
Law of conservation of mass:
No
atoms
are
made
or
lost
during a
chemical
reaction
, so the mass of
reactants
and
products
is the
same
A 'decrease' in mass could indicate a
gas
was
made
during the
reaction
and has
escaped
from the container
An 'increase' in mass could indicate that
gas
from the
air
is reacted, so its mass is added to the container
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