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Chapter 1 Experimental Chemistry, www, image, image, image, image, image,…
Chapter 1
Experimental Chemistry
physical quantity
time
↳ SI unit:
second
↳ symbol:
s
temperature
↳ how
hot
or
cold
something is
↳ SI unit:
kelvin
↳ symbol:
K
length
↳
distance
between
two points
↳ SI Unit:
metre
↳ symbol:
m
mass
↳ how much
matter
is
present
in a substance
↳ SI Unit:
kilogram
↳ symbol:
kg
volume
↳
amount
of
space
something
occupies
↳ SI Unit:
cubic metre
↳ symbol:
m³
measurement of time
↳ 1h = 60min = 3600s
digital stopwatch
accuracy →
±0.01s
analogue stopwatch
accuracy →
±0.1s
measurement of temperature
↳ temp in
K
=
temp in
°C + 273
digital thermometer
alcohol thermometer
temp sensors/probes connected to data loggers
measurement of length
↳ 1m = 10dm = 100cm = 1000mm
metre rule
accuracy →
±0.1cm
measuring tape
accuracy → ranges from
±0.1cm
to
±0.5cm
measurement of mass
↳ 1kg = 1000g = 1 000 000mg
electronic balance
accuracy →
±0.01
(just write what you see)
measurement of volume
↳ 1m³ = 1000dm³ = 1 000 000cm³
how to choose appropriate apparatus?
↳ the
accuracy
required
↳ the
volume
to be measured
measuring cylinder
↳ accuracy →
±0.5
(e.g. 31.5cm³)
burette
(50cm³)
↳ accuracy →
±0.05
(e.g. 31.55cm³)
pipette
(25.0cm³)
↳ accuracy →
accurately fixed
volumes (e.g. 10.0cm³)
remember to write .0 at the back!
volumetric flask
↳ accuracy →
accurately fixed
volumes (e.g. 100cm³)
gas syringe
(100cm³)
↳ accuracy →
±0.5
(e.g. 31.5cm³)
reading volume
position eyes at the
meniscus
(curved formed at the surface of the liquid in the container)
to avoid
parallax error
www
measuring cylinder
volumetric flask
pipette
burette (pronouced brew-rette)
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