A student investigated the rate of decomposition of hydrogen peroxide, catalysed by manganese(IV) oxide.
The equation for the reaction is: 2H2O2(aq)→2H2O(l)+O2(g)2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + \text{O}_2\text{(g)}2H2O2(aq)→2H2O(l)+O2(g)
Which state symbol in this equation represents a substance dissolved in water, rather than one of the three primary states of matter?
What two pieces of measuring apparatus could the student use to find the rate of production of oxygen gas?
The table below shows the results of the investigation:
| Time in s\text{s}s | Volume of oxygen gas collected in cm3\text{cm}^3cm3 |
|---|---|
| 0 | 0 |
| 15 | 36 |
| 30 | 58 |
| 45 | 70 |
| 60 | 76 |
| 75 | 78 |
| 90 | 78 |
Give three conclusions that can be drawn about the rate of reaction from this data.
The student repeated the investigation using a more concentrated solution of hydrogen peroxide. All other variables (such as the volume of solution and mass of catalyst) were kept the same. Which two of the following statements are correct?