Question 1
At equilibrium, both reactions stop. Correct this statement.
Need a hint for Question 1?
Ask separately whether reactions continue and whether concentrations change.
Check Question 1
Both reactions continue at equal rates.
STUDENT SPACE · TOPIC 4
Reversible reactions and equilibrium
Explain reversible changes and dynamic equilibrium.
The essentials
- Heating blue hydrated copper(II) sulfate removes water and leaves white anhydrous copper(II) sulfate.
- Anhydrous cobalt(II) chloride is blue; the hydrated form is pink.
- In a closed system, matter cannot enter or leave. Products remain available for the reverse reaction.
Key vocabulary
| English | Chinese |
|---|---|
| reversible | 可逆的 |
| hydrated | 含结晶水的 |
| anhydrous | 无水的 |
| dynamic equilibrium | 动态平衡 |
Quick practice
Try each question before opening its hint or answer. Use paper for calculations and diagrams.
Question 2
State the colour change when water is added to anhydrous copper(II) sulfate.
Need a hint for Question 2?
Compare anhydrous and hydrated copper(II) sulfate.
Check Question 2
White to blue.
Question 3
A forward reaction is faster than the reverse reaction. Has equilibrium been reached? Explain.
Need a hint for Question 3?
Equilibrium requires a particular relationship between the two rates.
Check Question 3
No. Equilibrium requires equal forward and reverse rates.
Use Lesson 4 in your worksheet for written practice. Your teacher will discuss those answers in class.