A student investigated the reaction between excess dilute hydrochloric acid and calcium carbonate (marble). They compared the rate of reaction using medium-sized marble chips (small surface area) and finely crushed marble powder (large surface area).
| Time / s | Volume of carbon dioxide / cm3\text{cm}^3cm3 (Line A) | Volume of carbon dioxide / cm3\text{cm}^3cm3 (Line B) |
|---|---|---|
| 0 | 0 | 0 |
| 10 | 15 | 35 |
| 20 | 28 | 58 |
| 30 | 40 | 72 |
| 40 | 50 | 80 |
| 50 | 59 | 80 |
| 60 | 67 | 80 |
| 70 | 73 | 80 |
| 80 | 77 | 80 |
| 90 | 80 | 80 |
| 100 | 80 | 80 |
State how the graph shows that Line A represents the results for the medium-sized marble chips.
