Effect of pressure, volume, temperature and catalysts
Answers are for parents and teachers.
1
For 2NO + O₂ → 2NO₂, v = k[NO]²[O₂] (from experiment). How many times does the rate rise if the pressure is tripled?
27
2
At 10 °C the rate is 4 mol/(L·min), γ = 2. What is the rate at 40 °C in mol/(L·min)?
32
3
At 70 °C the rate is 81 and γ = 3. What is the rate at 50 °C?
9
4
By how many °C must the temperature rise for a reaction with γ = 2 to speed up 16 times?
40
5
Why does food spoil more slowly in a refrigerator?
The temperature is lower, so chemical and biological processes slow down (Van’t Hoff).