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Chemistry
Chapter 17 Rate of Reactions
How Do We Measure Rate of Reaction?
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Cards (3)
Measuring
Change
in
Mass
of
Reactants
and
Products
Over
Time
Conical
flask
placed
on
electronic
balance
and
mass
is
measured
Reactants
added
,
measure
initial
mass
Mass
of
flask
and
reaction
mixture
is
recorded
at
time intervals
(e.g. 30 secs)
Mass
of
reaction
mixture
=
total
mass
of flask & products -
mass
of
flask
Piece of
cotton
wool
is
placed
at
mouth
of
conical
flask
to
prevent
loss
of
product
Volume
of
gas
Reactants
added
to
conical
flask
,
add
stopper
that is
attached
to
gas
syringe
Volume
recorded
at
time
intervals
(e.g. 30 secs)
Stopper
is
placed
at
mouth
of
conical
flask
to
prevent
gas
produced
from
escaping
Graph
Steeper
the gradient,
faster
the rate of reaction
Gradient is
steepest
as
conc.
of reactants are at
maximum
Gradient
decreases
when decrease in mass, reaction
slows
down
Gradient becomes
0
when
one or more
reactants are used up. (Cannot say all because reactant might be in excess)
