Rates of reaction

Question 1

Different reactions in the lab and their rates

Answer 1

acid/alkali - fast
acid/chalk - medium
iron/oxygen - slow

Question 2

Different everyday reactions and their rates

Answer 2

gas explosion - fast
making toast - medium
oil forming - slow

Question 3

Explain particle size

Answer 3

The rate of a chemical reaction increases as the particle decreases.

Question 4

Explain concentration

Answer 4

The rate of a chemical reaction decreases as the concentration decreases.

Question 5

Explain temperature

Answer 5

The rate of a chemical reaction increases as the temperature increases.

Question 6

Explain catalysts

Answer 6

Catalysts are special substances that can be used to increase the rate of chemical reactions; different reactions require different catalysts.

Question 7

The steeper the slope,…

Answer 7

…the faster the rate of reaction

Question 8

Formula for average rate of reaction

Answer 8

average rate of reaction = measured change/time taken for the change

Question 9

Measured change:

Mass of reactions / g
Volume of gas produced / cm3
Concentration / mol l-1 (or mol/l)

Answer 9

Unit:

g s-1 (or g/s)
cm3 s-1 (or cm3/s)
mol l-1 s-1 (or mol/l/s)