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- 1. Multiple Choice
What is it called?
weighing boat
weighing ship
weighing box
floating boat
- 2. Multiple Choice
What does the TARE button do?
resets the reading to zero
doubles the previous reading
gives an average of the previous two readings
makes the reading more accurate and precise
- 3. Multiple Choice
Weighing by difference is the same thing as weighing accurately approximately.
TRUE
FALSE
- 4. Multiple Choice
Weigh accurately and approximately 5 g. Tick all the correct recorded readings.
5 g
5.000 g
5.011 g
5.014 g
- 5. Multiple Choice
Name this technique: Heating a substance, allowing it to cool in a desiccator, weighing it and repeating the steps until no further changes in mass observed.
Weighing boat analysis
Weighing by difference
Weighing accurately and approximately
Heating to constant mass
- 6. Multiple Choice
Why is a desiccator used in gravimetric analysis?
to prevent reabsorption of water
to heat up the sample
to weigh the sample precisely and accurately
to remove all moisture from a wet sample
- 7. Multiple Choice
Gravimetric analysis is used to determine the mass of an element or compound in a substance.
TRUE
FALSE
- 8. Multiple Choice
In gravimetric analysis, a substance is converted into another substance of known chemical composition, which can be readily isolated and purified. Tick the possible ways of obtaining the new substance.
precipitation
volatilisation
oxidation
reduction
- 9. Multiple Choice
In precipitation conversion, why is the filtrate tested?
To check if reaction has gone to completion.
To check for presence of water.
To check for impurities.
To check for presence of volatile substances.
- 10. Multiple Choice
In _________ conversion the substance is heated and any volatile products (often water) are evaporated. The substance is heated to constant mass and the final mass recorded.
volatilisation
precipitation
volumetric
evaporation
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