Foundation June 2018 Paper 2 Q24
24. Adanna wants to buy a ring.
The ring she wants has a mass of 12 g when made from gold.
The density of the gold in the ring is 19·32 g/cm\(^3\).
The same ring could also be made from silver.
The density of the silver in the ring would be 10·48 g/cm\(^3\).
Calculate the difference in the masses of the two rings. [4]
Difference in mass is ………… g
| Scheme | Marks | Comments |
|---|---|---|
| 12 × 10.48 ÷ 19.32 (=6.509… g) | M2 | M1 for 12 ÷ 19.32 (= 0.6211…) |
| 12 – 6.5(….) | M1 | Accept 6.5(…) – 12 FT ‘their 12 × 10.48 ÷ 19.32’ provided < 12 CAO, allowing also a negative difference |
| 5.49(06….g) or 5.5 (g) | A1 | |
| (4) |