Apparatus for measuring Flashcards
1
Q
what do u use for weighing chemicals? to what degree of accuracy?
A
top pan balance to 2d.p
2
Q
what do u use for timing? to what degree of accuracy?
A
stop-clock to 2d.p
3
Q
what do u use for measuring temperatures? to what degree of accuracy?
A
thermometer, to the nearest 1/10°C
4
Q
what do u measure volumes of liquids in?
A
cm3 or dm3
5
Q
1cm3=?dm3
A
1cm3=1000dm3
6
Q
what do u use measuring cylinders for?
A
- measuring 5cm3-> 1000cm3
- easy
- quick
- not as accurate
- larger amounts
7
Q
what do u use volumetric pipettes for?
A
- measure single, fixed volume (usually 10cm3 or 25cm3)
- accuracy
8
Q
what do u use burettes for?
A
- measure up to 50cm3
- very accurate
9
Q
what is a volumetric flask used for?
A
- measure volumes more accurately than a beaker
- solutions of solid and liquid
10
Q
what can u use to measure gases?
A
- gas syringe
- upturned measuring cylinder
11
Q
why might a gas syringe not be used?
A
very expensive,, might lack access to one
12
Q
how to increase accuracy in an experiment
A
- repeat measurements in same way each
- use apparatus with small scale division
- use apparatus carefully
