Measuring Rate Of Reaction

Question 1

Qualitative and quantitative methods

Answer 1

Qualitative: methods based on what we observe, and involve things such as colour change
Quantitative: use measurements such as mass, volume, etc.

Question 2

Methods used to determine the influence of the reaction surface, area, concentration, temperature, and a catalyst on the reaction rate:

Answer 2

1. Measure the time for an increase in volume of the gaseous product that forms
2. Measure the time for a decrease of the mass of the reaction mixture
3. Turgidity: measure the time for a precipitate to form
4. Measure the time of change in colour intensity
5. Measure the time in which the pH of the reaction changes
6. Measure the time in which the reaction mixture conducts an electrical circuit

Question 3

The effect of concentration on reaction rate

Answer 3

Na2S2O3 + 2HCl —> 2NaCl + H2O + SO2 + S

OR

Mg + 2HCl —> MgCl2 + H2

The one with the highest concentration will be the steepest

Question 4

The effect of surface area on reaction rate

Answer 4

CaCO3 + 2HCl —> CaCl2 - H2O + CO2

Steepest one is fastest (has highest surface area)