CHM 418 Theory Questions: Water Activity in Foods: Concepts, Implications, and Freezing Effects

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.

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