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Integrated Science Recap – Laboratory Safety, SI Units and Unit Conversion | Jack (2026)

Laboratory Safety, SI Units and Unit Conversion

Subject: Integrated Science

Jack (2026)

For use on Thursday, 24 September 2026

01

Laboratory Skills and Measurement

Fill in the Blanks

Complete each sentence with the most suitable word, unit, symbol or numerical value.

  1. A is used to measure the volume of a liquid more accurately than a beaker.
  2. A is used to transfer a small amount of liquid drop by drop.
  3. A mortar and are used to crush a solid substance into a fine powder.
  4. A is used to hold a test tube while it is being heated.
  5. A wire gauze is placed on a tripod to a container during heating.
  6. Before lighting a Bunsen burner, its air hole should be .
  7. When lighting a Bunsen burner, the match should be lit before the is turned on.
  8. Opening the air hole of a Bunsen burner produces a blue flame.
  9. The yellow Bunsen burner flame is also called the flame.
  10. Fuel, oxygen and make up the fire triangle.
  11. A fire blanket extinguishes a fire mainly by cutting off its supply of .
  12. If a person’s clothing catches fire, the person should stop, drop and .
  13. The SI base unit of length is the .
  14. The SI base unit of mass is the .
  15. The SI base unit of time is the .
  16. The SI derived unit of area is the .
  17. The prefix kilo- (k) represents a factor of .
  18. The prefix milli- (m) represents a factor of .
  19. Complete the conversion: 4.5 km = m.
  20. Complete the conversions: 350 cm = m and 2 Gm = m.
20 marks
02

Laboratory Safety and SI Measurement

Multiple-Choice Questions

Choose the best answer for each question.

  1. Which apparatus is most suitable for measuring 25 mL of water?
    1. Beaker
    2. Measuring cylinder
    3. Test tube
    4. Evaporating dish
  2. Which apparatus is used to transfer a small quantity of a solid chemical?
    1. Dropper
    2. Spatula
    3. Funnel
    4. Thermometer
  3. Which apparatus is used to separate an insoluble solid from a liquid?
    1. Filter funnel and filter paper
    2. Measuring cylinder and beaker
    3. Test tube and test-tube holder
    4. Tripod and wire gauze
  4. Which apparatus is used to measure temperature?
    1. Balance
    2. Thermometer
    3. Stopwatch
    4. Metre rule
  5. Which apparatus supports a beaker above a Bunsen burner?
    1. Dropper
    2. Tripod
    3. Spatula
    4. Test-tube rack
  6. What should be done before lighting a Bunsen burner?
    1. Open the air hole fully
    2. Close the air hole
    3. Remove the gas tube
    4. Fill the burner with water
  7. Which flame should be used as the safety flame?
    1. Roaring blue flame
    2. Luminous yellow flame
    3. Colourless flame
    4. Green flame
  8. Which Bunsen burner flame is best for strong heating?
    1. Luminous yellow flame
    2. Non-luminous blue flame
    3. Orange safety flame
    4. Smoky yellow flame
  9. If you smell gas in the laboratory, what should you do first?
    1. Light a match to find the leak
    2. Ignore the smell
    3. Turn off the gas supply and inform the teacher
    4. Open the Bunsen burner’s air hole
  10. Which action extinguishes a fire by removing oxygen?
    1. Adding more fuel
    2. Covering the fire with a fire blanket
    3. Heating the burning material
    4. Opening all the windows
  11. What should a person do if their clothing catches fire?
    1. Run around the room
    2. Stop, drop and roll
    3. Hide under a table
    4. Wave their arms quickly
  12. Which substance should not be used to extinguish an electrical fire?
    1. Carbon dioxide
    2. Suitable dry powder
    3. Water
    4. A suitable fire extinguisher
  13. Which of the following is an SI base unit?
    1. Square metre
    2. Metre per second
    3. Kilogram
    4. Newton
  14. Which of the following is an SI derived unit?
    1. Second
    2. Metre
    3. Kelvin
    4. Cubic metre
  15. What is the SI base unit of electric current?
    1. Volt
    2. Ampere
    3. Watt
    4. Joule
  16. What does the prefix giga- (G) mean?
    1. 103
    2. 106
    3. 109
    4. 10−9
  17. What does the prefix milli- (m) mean?
    1. 10−1
    2. 10−2
    3. 10−3
    4. 10−6
  18. What is 6.2 km expressed in metres?
    1. 62 m
    2. 620 m
    3. 6,200 m
    4. 62,000 m
  19. What is 450 cm expressed in metres?
    1. 0.45 m
    2. 4.5 m
    3. 45 m
    4. 4,500 m
  20. What is 3.5 L expressed in millilitres?
    1. 35 mL
    2. 350 mL
    3. 3,500 mL
    4. 35,000 mL
20 marks
03

Scientific Skills and Safety

True or False

Write “True” or “False” for each statement. If a statement is false, correct it.

  1. A beaker is more accurate than a measuring cylinder for measuring the volume of a liquid.
  2. A spatula can be used to transfer a small amount of a solid chemical.
  3. A test-tube holder protects the hand when a test tube is being heated.
  4. A thermometer is used to measure the mass of an object.
  5. A funnel can help transfer a liquid into a container with a narrow opening.
  6. The air hole should normally be closed before a Bunsen burner is lit.
  7. A match should be lit only after the gas has been flowing for several minutes.
  8. A luminous Bunsen burner flame is yellow and easy to see.
  9. A non-luminous blue flame is hotter than a luminous yellow flame.
  10. A lit Bunsen burner may be left unattended if it has a yellow safety flame.
  11. Fuel, oxygen and heat are the three parts of the fire triangle.
  12. Removing heat from a fire can extinguish it.
  13. Water is suitable for extinguishing every type of fire.
  14. If a person’s clothing catches fire, the person should run quickly.
  15. The kilogram is the SI base unit of mass.
  16. The minute is the SI base unit of time.
  17. Area and speed are derived quantities.
  18. The prefix deci- (d) means one-tenth, or 10−1.
  19. The prefix milli- (m) means one-millionth, or 10−6.
  20. One gigametre is equal to 1,000,000,000 metres.
20 marks

Question 1 — Fill in the Blanks

  1. Measuring cylinder
  2. Dropper / dropping pipette
  3. Pestle
  4. Test-tube holder
  5. Support
  6. Closed
  7. Gas tap / gas supply
  8. Non-luminous
  9. Luminous / safety
  10. Heat
  11. Oxygen
  12. Roll
  13. Metre (m)
  14. Kilogram (kg)
  15. Second (s)
  16. Square metre (m2)
  17. 1,000 or 103
  18. 0.001 or 10−3
  19. 4.5 km = 4.5 × 1,000 m
    = 4,500 m
    4,500 m
  20. 350 cm = 350 ÷ 100 m = 3.5 m

    2 Gm = 2 × 109 m
    = 2,000,000,000 m
    3.5 m and 2,000,000,000 m
Important spelling: The correct SI prefixes are milli- and giga-, not “mini-” and “gega-”.

Question 2 — Multiple-Choice Questions

  1. B — Measuring cylinder
  2. B — Spatula
  3. A — Filter funnel and filter paper
  4. B — Thermometer
  5. B — Tripod
  6. B — Close the air hole
  7. B — Luminous yellow flame
  8. B — Non-luminous blue flame
  9. C — Turn off the gas supply and inform the teacher
  10. B — Covering the fire with a fire blanket
  11. B — Stop, drop and roll
  12. C — Water
  13. C — Kilogram
  14. D — Cubic metre
  15. B — Ampere
  16. C — 109
  17. C — 10−3
  18. 6.2 km = 6.2 × 1,000 m
    = 6,200 m
    C — 6,200 m
  19. 450 cm = 450 ÷ 100 m
    = 4.5 m
    B — 4.5 m
  20. 3.5 L = 3.5 × 1,000 mL
    = 3,500 mL
    C — 3,500 mL
Unit-conversion reminder: When converting from a larger unit to a smaller unit, multiply. When converting from a smaller unit to a larger unit, divide.

Question 3 — True or False

  1. False. A measuring cylinder is more accurate than a beaker for measuring the volume of a liquid.
  2. True.
  3. True.
  4. False. A thermometer measures temperature. A balance measures mass.
  5. True.
  6. True. Closing the air hole helps produce a visible yellow safety flame when the burner is lit.
  7. False. The match or gas lighter should be lit first. The gas supply should then be turned on carefully.
  8. True.
  9. True.
  10. False. A lit Bunsen burner must never be left unattended.
  11. True.
  12. True. Cooling a fire removes heat from the fire triangle.
  13. False. Water must not be used on electrical fires or fires involving burning oil.
  14. False. The person should stop, drop and roll. A fire blanket may also be used by a trained person.
  15. True.
  16. False. The SI base unit of time is the second (s).
  17. True. Area is obtained from length × width, while speed is obtained from distance ÷ time.
  18. True.
  19. False. Milli- means one-thousandth, or 10−3. Micro- means one-millionth, or 10−6.
  20. True.
    1 Gm = 109 m
    = 1,000,000,000 m
Key idea: SI base quantities are measured using base units. Derived units are formed by combining base units, such as m2, m3 and m/s.

Metric Prefix Reference

Prefix Symbol Power of ten Value
giga- G 109 1,000,000,000
mega- M 106 1,000,000
kilo- k 103 1,000
deci- d 10−1 0.1
centi- c 10−2 0.01
milli- m 10−3 0.001
micro- µ 10−6 0.000001
nano- n 10−9 0.000000001
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