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Natural sciences

Matter, measuring and reactions

Educator section

Memorandum

It is important that learners know that the density of water is 1 g/cm 3 . This means that 1 litre of water weighs 1 kg.

The assessment proposed in the module is important, also for the learner's portfolio.

Leaner section

Content

Activity: to calculate the density of water [lo 2.3, lo 2.4]

TRANSLATION TASK:

The readings below were obtained after the mass and volume of water were measured:

Reading 1 Reading 2 Reading 3 Reading 4 Reading 5
Mass: 50 gVolume: 50 cm 3 Mass: 30 gVolume: 30 cm 3 Mass: 90 g Volume: 90 cm 3 Mass: 80 gVolume: 80 cm 3 Mass: 60 gVolume: 60 cm 3

Apply the readings above to a graph to show the different ratios and indicate the density of water. (The density is obtained by dividing the mass by the volume.)

CRITERIA FOR ASSESSING THE TRANSLATION TASK:

1. A suitable heading.

2. Both axes correctly marked.

3. Appropriate scale for both axes.

4. Calculated value of the density is correct.

5. All coordinates are drawn correctly.

6. Density correctly calculated and shown (Density: 1 g/ cm3).

ASSESSMENT ACCORDING TO THE CRITERIA

LO MARKS LEVEL KEY TO LEVEL
1 and 2 1-34% 1 Unable to prepare the graph
35-39% 2 Up to 4 mistakes on the list of criteria
40-69% 3 2 or 3 mistakes on the list of criteria
70-100% 4 No or only one mistake
LO 2.3 LEVEL
LO 2.4 MARK

COMMENTS:

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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 2.3: We know this when the learner interprets information by identifying key ideas in text, finding patterns in recorded data, and making inferences from information in various forms (e.g. pictures, diagrams, text);

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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Source:  OpenStax, Natural sciences grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11077/1.1
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