O-LevelPhysicsForces5054/22 · May/June 2019 · Q17 Marks

A student records the mass and volume of two irregular objects, one made of iron and the other of copper. The student uses the equipment shown in Fig. 1.1. Table 1.1 shows the results obtained. [Figure 1.1] Table 1.1 | | mass/g | volume/cm³ | |---|---|---| | iron | 400 | 51 | | copper | 350 | 39 |

(a)Describe how to determine the volume of an irregular object with the measuring cylinder.[2]
(b)Calculate the density of iron.[2]
(c)A third object, which is also made of copper, has the same volume as the iron object. Calculate the mass of this copper object.[2]
(d)State and explain what happens to the density of the iron object when it is heated.[1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Mark scheme

Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.

[B1] reading / volume with water / liquid alone
[B1] or use displacement can filled (to spout)
[B1] subtracted from reading (of volume) with object (submerged) in cylinder
[B1] or place rock in displacement can and measure volume of overflow with measuring cylinder
[C1] (d =) M/V algebraic or numerical
[A1] 7.8 g/cm³
[C1] 350 × 51/39
[C1] or (density of Cu =) 350 / 39 or or 9.0 (g/cm³) seen
[A1] 460 g
[B1] (density) decreases
[B1] and volume increases / object expands
[B1] or molecular explanation of expansion

On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.