400 Level Chemistry Department exam questions and detailed answers. Download the answers in document format. Correct, detailed, and straightforward answers.
Questions:
(a)
(i) What do you understand by the term water activity of food?
(ii) What equilibrium relative humidity corresponds to a water activity of 0.85? State the implications of this water activity level for food stored for ≤3 days.
(b) Distinguish between water activity and moisture content of food.
(c) Explain the physical and microbiological implications of freezing foods.
