One day, Grace went grocery shopping at Aeon. She left the groceries in the car and continues to shop for hours. When she reached home, she found that the milk had gone sour. Why do we need to keep the milk in refrigerator?
Milk contains bacteria which will react with lactose in milk. In refrigerator, the temperature is low so the reaction between the bacteria and milk is slower.
Deduce the relationship between the concentration of reactant with rate of reaction
The higher the concentration, the faster the rate of reaction
State the formula used to calculate the concentration of sodium thiosulphate (refer to Table 1.1 in lab manual)
M1V1 = M2V2
State the factors affecting rate of reaction
concentration, temperature, catalyst and particle size
A group of students carried out a study of changing concentration of X with reaction rate. Graph 1/t against concentration of X is shown in the Figure above. What is the relationship between times of reaction with rate of reaction?
When time of reaction increase, the rate of reaction decrease (inversely proportional)
Define catalyst. State the catalyst used in this experiment.
Catalyst is a substance that increase the rate of reaction by providing an alternative pathway with lower activation energy. Managanese sulphate (MnSO4)
List all the precautions of the experminent
1) Measure the volume of solution, time and temperature accurately 2) Stir the solution properly 3) Observe 'X' mark from top of the conical flask
What does 1/t represent?
Rate of reaction