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To describe the terms matter, atoms, molecules, elements and compounds

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NATURAL SCIENCES

Matter, measuring and reactions

EDUCATOR SECTION

Memorandum

Assignment 4:

1.

  • km
  • m3
  • mm
  • g en mg
  • kl of m3
  • m2
  • m en cm
  • ton
  • kl of cm3
  • light years (the distance light travels in one year)
  • Examples to explain the importance of measurement: any three good examples, e.g.
  • the amount of medicine someone has to drink
  • how much cement and sand should be mixed for building
  • to measure achievements in athletics (high jump, long jump, sprints, etc.)

LEANER SECTION

Content

Activity: To use units of measurement and explaining why it is important to be able to measure [LO 2.4]

Before I am able to determine my expenses with regard to fuel for a planned journey, I need to know the distance that I will be travelling. If I want to tile the kitchen floor, I need to calculate the size of the floor (surface). When we want to work out how much milk a baby of a particular age and mass should get, we need to be able to measure the volume (contents) of a bottle, etc. The metric system of measurement (the Système International d'Unités, or SI) is used in most parts of the world. The most important units that we have to deal with according to the SI system of measurements are represented in the following table:

Table 1
  LARGE MEDIUM SMALL
Length1 km = 1 000 m1 m = 1 000 mm kilometre (km) meter (m)centimetre (cm) millimetre (mm)
Surface1 cm² = 100 mm²1 m² = 10 000 cm² square meter (m²) square centimetre (cm²) square millimetre (mm²)
Content1 kℓ = 1 000 ℓ1 l = 1 000 ml kiloliter (kℓ)cubic meter (m3 ) litre (ℓ) cubic centimetre (cm3 )millilitre (mℓ)
Mass1 kg = 1 000 g1 g = 1 000 mg kilogram (kg) gram (g) milligram (mg)

1. Give the units of measurement that you would use to measure the following?

  • the distance that a space shuttle travels around the earth.
  • the amount of concrete required for the foundations of a house
  • the circumference of roller skate wheels.
  • the mass of a locust.
  • Figure 1
    Figure 1 (clip0065.png)
    the capacity of a swimming pool.
  • the size (surface) of a tennis court.
  • the length of our educator.
  • the mass of a truck.
  • the capacity of a hot water cylinder.
  • the distance from the earth to the nearest star.

2. Name three further examples to show the importance of being able to measure.

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Assessment

Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.4: We know this when the learner application of knowledge: applies knowledge appropriately by connecting the learnt concept to a variation of the known situation.

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