Physics Molecules and Matter Practice Exam Questions

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Question	Answer	Extra information
1	Student A's measurements had a higher resolution [1 mark] Student B was more likely to misread the temperature [1 mark]
2	a random error [1 mark]
3	8.4°C [1 mark]
4	740 (seconds) [1 mark]	allow answers in the range 730 - 780
5	0.40 x 199 000 [1 mark] 79 600 (J) [1 mark]	accept 79 600 (J) with no working shown for 2 marks
6	stearic acid has a higher temperature than the surroundings [1 mark] temperature will decrease until stearic acid is the same as the room temperature / surroundings [1 mark]	accept stearic acid is hotter than the surroundings
7	range of speeds [1 mark] moving in different directions [1 mark]	accept random motion
8	internal energy [1 mark]
9	density = mass / volume [1 mark]
10	0.00254 / 0.0141 [1 mark] 0.18 [1 mark]kg/m³ [1 mark]	accept 0.18 with no working shown for the calculation [2 marks]
11	Level 2: The method would lead to the production of a valid outcome. Key steps are identified and logically sequenced [3-4 marks] Level 1: The method would not necessarily lead to a valid outcome. Some relevant steps are identified, but links are not made clear [1-2 marks] No relevant content [0 marks] Content can include: part fill a measuring cylinder with water measure initial volume place object in water measure final volume volume of object = final volume - initial volume fill a displacement / eureka can with water water level with spout place object in water collect displaced water measuring cylinder used to determine volume of displaced water
12	[1 mark] density = 2.70 (g/cm³) [1 mark]	an answer of 2.70 (g/cm³) scores 2 marks
13	limestone [1 mark]
14	eye position when using measuring cylinder or water level in can (at start) not at level of spout or not all water displaced by stone is collected in container [1 mark]
15	volume would be lower / higher [1 mark]
16	Level 3: Clear and coherent description of both methods including equation needed to calculate density. Steps are logically ordered and could be followed by someone else to obtain valid results. [5-6 marks] Level 2: Clear description of one method to measure density or partical description of both methods. Steps may not be logically ordered. [3-4 marks] Level 1: Basic description of measurements needed with no indication of how to use them. [1-2 marks] No relevant content [0 marks] Content can include for both: measure mass using a balance calculate density using p = m/V Metal cube: measure length of cube's sides using a ruler calculate volume Small statue: immerse in water measure volume / mass of water displaced volume of water displaced = volume of small statue	allow P = W/ T
17	any two from: calculate a mean reduces the effect of random errors identify/remove anomalies [2 marks]	reduces human error is insufficient allow to assess the repeatability of the data
18	random error [1 mark] (because) eye position would not be the same each time (relative to the liquid) [1 mark]	allow a parallax error human error is insufficient allow systematic error only if it is clear that the student always viewed liquid level from above meniscus (or below)
19	(a temperature increase would) increase the pressure in the tube (even if the volume was constant) [1 mark] (because a highter temperature would mean) higher (average) kinetic energy of molecules / particles [1 mark]	allow higher (average) speed for higher (average) kinetic energy
20		an answer of 8.0 (cm³) scores 3 marks allow for 2 marks
21	work is done on the air (in the tyre) [1 mark] so the temperature (of the air) increases [1 mark]	allow the (average) kinetic energy of the particles increases

Physics Molecules and Matter Practice Exam Questions

Molecules and Matter Practice Exam Questions

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Molecules and Matter Practice Exam Worksheet