Physics 5054/31 — October/November 2010

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

questions

marks

120

minutes

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

Q15MObservations and MeasurementsExperimental ContextsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will estimate the temperature of a Bunsen flame.

You have been provided with a Bunsen burner, a 10 g mass, tongs, a supply of water at room temperature, a stirrer, a measuring cylinder, a glass beaker, a thermometer and a stand, boss and clamp to hold the thermometer.

(a)

(i)

Using the measuring cylinder, transfer 50 $\text{cm}^3$ of water from the supply to the beaker. Clamp the thermometer so that the thermometer bulb is covered by the water in the beaker.

Record the temperature $\theta_1$ of the water.

$\theta_1$ = ______

(ii)

Adjust the Bunsen burner so that a blue flame is produced. Holding the 10 g mass in the tongs, place the mass in the centre of the Bunsen flame. Hold in this position for approximately 1 minute.

Quickly transfer the mass to the water and record the highest temperature $\theta_2$ reached by the water.

The 10 g mass will be very hot; it should only be held with the tongs.

$\theta_2$ = ______

(b)

The heat transferred from one object to another is given by the equation

\text{change in thermal energy} = \text{mass} \times \text{specific heat capacity} \times \text{change in temperature}.

A volume of 50 $\text{cm}^3$ of water has a mass of 50 g. The specific heat capacity of water is $4.2\ \text{J / (g }^\circ\text{C)}$ and the specific heat capacity of the 10 g mass is $0.42\ \text{J / (g }^\circ\text{C)}$ .

(i)

Calculate the heat gained by the water in the beaker.

heat gained = ______

(ii)

Assuming that the heat gained by the water is equal to the heat lost by the 10 g mass, calculate the fall in temperature of the mass.

fall in temperature = ______

(iii)

Hence deduce the temperature $\theta_B$ of the Bunsen flame.

$\theta_B$ = ______

(c)

Suggest a reason why your value for $\theta_B$ might be lower than the actual temperature of the Bunsen flame.

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Q4Use of Techniques, Apparatus and Materials · Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation15M

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