1993 年
化學 · 共 29 題 · 點擊選項即時核對答案
Directions: CE93_30 and CE93_31 refer to the following experiment: A mixture of methyl propanoate and sulphuric acid was allowed to react by heating under reflux for some time until equilibrium was reached. The resulting mixture M was then transferred to flask Y and heated as shown below:
What is the function of the piece of apparatus labelled X ?
Directions: CE93_30 and CE93_31 refer to the following experiment: A mixture of methyl propanoate and sulphuric acid was allowed to react by heating under reflux for some time until equilibrium was reached. The resulting mixture M was then transferred to flask Y and heated as shown below:
The first fraction of the distillate collected in flask Z is mainly
Which of the following substances can react with propene?
Which of the following statements about fossil fuels is correct?
A polymer has the following structure:
Its monomer is
Which of the following reagents can be used to distinguish between aluminium sulphate solution and lead(II) ethanoate solution ?
Which of the following statements is INCORRECT ?
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
| 1st statement | 2nd statement |
|---|---|
| Concentrated sulphuric acid can be used to prepare nitric acid. | Sulphuric acid is more volatile than nitric acid. |
For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.
| 1st statement | 2nd statement |
|---|---|
| Sodium carbonate is not decomposed by heat. | Sodium carbonate is an ionic compound. |