2008 年
化學 · 共 45 題 · 點擊選項即時核對答案
Which of the following is/are related to the use of silver oxide cells in watches ?
When chlorine reacts with methane under sunlight, which of the following compounds can be formed ?
Which of the following substances are sources of organic chemicals?
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 |
|---|---|
| The bleaching action of sodium sulphite lasts longer than that of sodium hypochlorite. | Sodium sulphite bleaches by oxidation while sodium hypochlorite bleaches by reduction. |
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 |
|---|---|
| The boiling point of butane is higher than that of methane. | The van der Waals' forces between butane molecules are stronger than the forces between methane molecules. |
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 |
|---|---|
| If concentrated hydrochloric acid is dripped onto one's hand, one should wash the hand immediately with concentrated ammonia solution. | Concentrated ammonia solution is a weak alkali. |
Organic compound Q has the following composition by mass: C: 37.5% H: 12.5% O: 50.0% What is the possible chemical formula of Q ? (Relative atomic masses: H = 1.0, C = 12.0, O = 16.0)
Nitroglycerin (C₃H₅N₃O₉) is an explosive and can explode according to the following equation: 4C₃H₅N₃O₉(l) → 12CO₂(g) + 12H₂O(g) + 6N₂(g) + O₂(g) 0.1 mole of nitroglycerin undergoes explosion and the products are allowed to cool to room temperature. What is the total volume of gases left behind at room temperature and pressure? (Molar volume of gas at room temperature and pressure = 24 dm³)
When calcium granules are added to water, colourless gas bubbles are formed. The mixture is then filtered to obtain a clear solution. Which of the following is correct if excess dilute hydrochloric acid is added to the clear solution?
From which of the following processes can lead be obtained in a school laboratory ?