Description
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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![A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]")
