Higher November 2021 Paper 2 Q7
7 Liquid A has a density of 1.8 g/cm\(^3\)
Liquid B has a density of 1.2 g/cm\(^3\)
80 cm\(^3\) of liquid A is mixed with 40 cm\(^3\) of liquid B to make 120 cm\(^3\) of liquid C.
Work out the density of liquid C. (3)
| Answer | Mark | Mark scheme |
|---|---|---|
| 1.6 | P1 | for \(1.8 \times 80\ (= 144)\) or \(1.2 \times 40\ (= 48)\) or for 192 or for \(80 : 40 = 2 : 1\) |
| P1 | for \((\text{``}144\text{''} + \text{``}48\text{''}) \div (80 + 40)\) or \(192 \div 120\) or for \((1.8 \times 2 + 1.2) \div 3\) or \(4.8 \div 3\) | |
| A1 | oe |