CHM 418 Theory Questions: Water Activity and Food Preservation

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 activity corresponds to a water activity of 0.85? State the implications of such water activity on food if it has to be stored for at most three 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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