2008 年
化學 · 共 45 題 · 點擊選項即時核對答案
Which of the following statements concerning a soapy detergent is correct ?
Which of the following processes does NOT involve redox reaction(s) ?
The following table shows some information on mixing hydrochloric acid with sodium hydroxide solution:
| Mixture | Temperature rise / °C | |
|---|---|---|
| 25 cm³ of 1 M HCl | + 25 cm³ of 1 M NaOH | w |
| 50 cm³ of 1 M HCl | + 50 cm³ of 1 M NaOH | x |
| 25 cm³ of 2 M HCl | + 25 cm³ of 2 M NaOH | y |
| 50 cm³ of 2 M HCl | + 50 cm³ of 2 M NaOH | z |
Which of the following concerning the values of temperature rise is correct?
Which of the following statements concerning concentrated sulphuric acid is INCORRECT ?
Consider the following information on two reactions involving magnesium ribbons of the same shape:
| Reaction mixture | |
|---|---|
| Reaction 1 | 1.5 g Mg + 100 cm³ of 1 M HCl |
| Reaction 2 | 1.5 g Mg + 100 cm³ of 1 M H₂SO₄ |
Which of the following statements is correct? (Relative atomic mass: Mg = 24.3)
A compound is composed of element Z and hydrogen. Electrolysis of this compound under molten state produces the same number of Z atoms at the cathode as hydrogen molecules at the anode. The following half equation shows the change occurring at the anode: 2H⁻ → H₂ + 2e⁻ What is the oxidation number of Z in the compound ?
Calcium carbonate can be obtained from quicklime through two processes as shown below.
Which of the following combinations is correct?
| Process 1 | Process 2 | |
|---|---|---|
| adding water | adding Na₂CO₃(aq) | |
| adding Na₂CO₃(aq) | adding water | |
| adding water | heating | |
| heating | adding water |
Which of the following pieces of apparatus should be used when an acid is titrated with an alkali?
The following diagram shows the set-up of a chemical cell.
Given that Br₂(aq) is a stronger oxidizing agent than Fe³⁺(aq), which of the changes represented by the following half equations would occur if the cell is producing a current ?
In an experiment, a solution containing 3 moles of KOH reacts with another solution containing 1 mole of an acid for complete neutralization. Which of the following deduction is/are correct?