Grade 10 Physical Sciences · Mechanics

Describe and evaluate an experiment

Name apparatus, describe or explain steps of a method, and give safety precautions (repeat readings and work out an average).

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Physical Sciences Practical investigation/experiments for grade 10-12Miss Martins Maths and Science

Preparing a standard solution | ChemistryRoyal Society of Chemistry

How to Prepare a Burette for a TitrationWits University OFFICIAL

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Question 7.2 · November 2023 · Paper 2 · Provincial · 2 marks

In the reaction below, magnesium ribbon reacts with excess hydrochloric acid according to the following balanced chemical equation. When the reaction has stopped, the plunger in the syringe remained in the position as shown in the diagram below.

Mg(s) + 2 HC ℓ (aq) \to MgC ℓ_{2} (s) + H_{2} (g)

7.2 Write down the volume of

H_{2}

gas collected in the syringe.(2)

Work it out on paper first. Then mark yourself with the official memo, one tick at a time.

More past paper questions: describe and evaluate an experiment

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3. Question 4.1.3 · May/June 2024 · Paper 2 · National (DBE) · 2 marks
4.1 In an experiment, a test tube containing methanol, propanoic acid and a catalyst is heated in a water bath, as shown below.

Write down:
4.1.3 TWO reasons why the use of a water bath is preferred in this experiment(2)
Show the memo (2 ticks)Memo
1. ✓
  First reasonAlcohol/methanol/reactant is flammable/catches fire easily.
  1 mark · Describe and evaluate an experiment
2. ✓
  Second reasonTo heat evenly / a steady, controlled, gradual increase in temperature. (OR: Alcohol/methanol will evaporate too quickly/is volatile.)
  1 mark · Describe and evaluate an experiment
4. Question 7.2.2 · May/June 2023 · Paper 2 · National (DBE) · 2 marks
7.2 A hydrochloric acid solution, HCℓ(aq), is standardised by titrating it against $25$ cm $^{3}$ of a $0, 04$ mol·dm $^{- 3}$ sodium carbonate solution $Na_{2} CO_{3}$ (aq). At the endpoint, it is found that $19, 5$ cm $^{3}$ of HCℓ(aq) has reacted.

The balanced equation for the reaction is:

$Na_{2} CO_{3} (aq) + 2 HCl(aq) \to 2 NaCl(aq) + CO_{2} (g) + H_{2} O (ℓ)$

Answer the questions that follow.
7.2.2 Suppose a few drops of water were present in the burette before it was filled with the hydrochloric acid solution.

How will the volume of the HCℓ solution needed to reach the endpoint be affected?

Choose from GREATER THAN, SMALLER THAN or REMAINS THE SAME. Give a reason for the answer.(2)
Show the memo (2 ticks)Memo
1. ✓
  ChoiceGreater than
  1 mark · Describe and evaluate an experiment
2. ✓
  ReasonThe few drops of water will dilute the HCℓ, therefore greater volume of acid will be needed to neutralise the base.
  1 mark · Describe and evaluate an experiment
5. Question 3.3 · November 2023 · Paper 2 · Provincial · 1 mark
The grade 10 learners conducted an experiment to investigate the effect of the increase in temperature on ethanol over a period of time at standard pressure.

The graph below was drawn using the results obtained.
3.3 Give the name of apparatus X.(1)
Show the memo (1 tick)Memo
1. ✓
  Apparatus XThermometer
  1 mark · Describe and evaluate an experiment

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