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5054/31

Physics 5054/31 — May/June 2015

Cambridge O-Level · Practical Test · worked solutions for every part, with the mark scheme

4
questions
30
marks
120
minutes

Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Observations and Measurements · Use of Techniques, Apparatus and Materials

Q15MExperimental ContextsObservations and MeasurementsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will determine the density of a salt solution.

You have been provided with

  • a 100 cm3\text{cm}^3 measuring cylinder,
  • a beaker containing salt solution.

You also have access to a top-pan balance.

If your measuring cylinder is calibrated in ml, then note that 100 ml = 100 cm3\text{cm}^3.

(a)

(i) Use the top-pan balance to measure the mass mEm_E of the empty measuring cylinder.

mEm_E = ______

(ii) Pour a large volume of the salt solution into the measuring cylinder and record accurately the volume VV of the solution.

VV = ______

(iii) Measure the mass mTm_T of the measuring cylinder with the solution.

mTm_T = ______

(iv) Determine the mass mm of the solution in the measuring cylinder.

mm = ______

2M
(b)

Explain, with the aid of a diagram, how you ensured that VV was measured as accurately as possible. Show the position of your eye when taking the measurement.

1M
(c)

Calculate the density ρ\rho of the salt solution using

ρ=mV\rho = \frac{m}{V}

ρ\rho = ______

1M
(d)

Explain an advantage of using a large volume of salt solution in this experiment.

1M

The rest of this paper

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