CHM 418 Theory Questions: Food Preservation Science: Water Activity, Freezing Processes, and Additives

300 Level Chemistry Department exam questions and detailed answers. Download the answers in document format. Correct, detailed, and straightforward answers.

Questions:

1. Define the term **water activity of food** and explain the various methods available for the modification of water activity in food.

2. Discuss the physicochemical processes that occur during the freezing of a fresh sample of tomato puree.

3. Outline four (4) food dehydration methods.

4. Give the roles of the following in foods:
(i) Sorbic acid
(ii) Nitrites
(iii) Cyanogens
(iv) Propanoic acid
(v) Benzoic acid

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