1998 年
化學 · 共 49 題 · 點擊選項即時核對答案
Which of the following statements concerning the gas produced in the above experiment are correct ?
Which of the following substances are commonly found in canned grapefruit juice ?
Upon heating, a mixture of iron and sulphur gives a black substance. Which of the following statements concerning the black substance are correct ?
For Questions 45–50, 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 |
|---|---|
| Element X (atomic number 11) reacts with element Y (atomic number 16) to form an ionic compound. | Each atom of X loses one electron and each atom of Y accepts two electrons to form a compound with formula X₂Y. |
For Questions 45–50, 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 |
|---|---|
| One mole of water occupies the same volume as one mole of carbon dioxide at room temperature and pressure. | One mole of water contains the same number of atoms as one mole of carbon dioxide. |
For Questions 45–50, 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 |
|---|---|
| The use of leaded petrol has been banned in Hong Kong. | Lead compounds in car exhaust can cause damage to human brains. |
For Questions 45–50, 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 |
|---|---|
| The ethanol content of beer is less than that of red wine. | Beer is made by fermentation of barley while red wine is made by fermentation of grapes. |
For Questions 45–50, 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 |
|---|---|
| Wash bottles used in the chemistry laboratory are commonly made of polyethene. | Polyethene is an addition polymer. |
For Questions 45–50, 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 |
|---|---|
| Paracetamol is a common active ingredient in anti-acids. | Paracetamol can neutralize hydrochloric acid in the stomach. |