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Questions and Answers
What is the S.I. unit for measuring mass?
What is the S.I. unit for measuring mass?
kilogram (kg)
Which of the following apparatus is used to measure the mass of a substance?
Which of the following apparatus is used to measure the mass of a substance?
What is the formula to convert 1 tonne to kilograms?
What is the formula to convert 1 tonne to kilograms?
1 tonne = 1000 kg
Which apparatus can measure approximate volumes of liquids like 100 cm3 or 250 cm3?
Which apparatus can measure approximate volumes of liquids like 100 cm3 or 250 cm3?
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Which apparatus is used to measure accurate fixed volumes of liquids?
Which apparatus is used to measure accurate fixed volumes of liquids?
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What is the S.I. unit for measuring the volume of a liquid?
What is the S.I. unit for measuring the volume of a liquid?
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The balance must be zeroed by pressing the ______ button.
The balance must be zeroed by pressing the ______ button.
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How do you measure the level of liquid in a burette?
How do you measure the level of liquid in a burette?
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What is the measurement accuracy of a burette?
What is the measurement accuracy of a burette?
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Study Notes
Measuring Mass
- Mass quantifies the amount of matter in a substance.
- Standard unit for mass is kilogram (kg); other units include gram (g) and tonne (t).
- Conversion: 1 tonne = 1,000 kg = 1,000,000 g.
- Apparatus for mass measurement:
- Beam balance
- Electronic “top-pan” balance
- Procedure for using an electronic balance:
- Place an empty container and tare the balance.
- Add chemical to the container and measure the displayed mass to the nearest 0.01 g.
Measuring Volume of Liquids
- Volume measures the space occupied by a liquid.
- Standard unit is cubic metre (m³); other units include cubic decimetre (dm³) and cubic centimetre (cm³).
- Conversion: 1 m³ = 1,000 dm³ = 1,000,000 cm³.
- Choice of apparatus depends on required volume and measurement accuracy.
Apparatus for Measuring Volume
-
Marked Beaker
- Measures approximate volumes of 100 cm³ or 250 cm³.
-
Measuring Cylinder
- Measures volumes of approximately 10 cm³, 25 cm³, or 50 cm³.
- Accuracy to the nearest 0.5 cm³ (e.g., 41.5 cm³).
-
Pipette
- Measures fixed liquid volumes precisely (e.g., 20.0 cm³ or 25.0 cm³); not for odd volumes like 26.0 cm³.
- Usage:
- Fill the pipette to the mark with a pipette filler.
- Deliver liquid into the desired container.
-
Burette
- Measures liquid volumes from 0.00 cm³ to 50.00 cm³ with 0.1 cm³ divisions.
- Accuracy to the nearest 0.05 cm³ (e.g., 24.00 cm³).
- Usage:
- Pour liquid into burette using a filter funnel.
- Record initial level, dispense liquid, and measure final level to determine the volume dispensed.
Application Examples
- Identify appropriate apparatus based on required liquid measurement (e.g., 25.0 cm³ most accurately measured using a pipette).
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Description
Test your knowledge of experimental design in chemistry with this quiz focused on measurement techniques and apparatus. Learn about how to measure physical quantities and collect gases effectively. Perfect for Secondary Three Express students.
