Question 1 stearic acid ch 3 ch 2 16 cooh is a common

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Question 1 Stearic acid, CH 3 (CH 2 ) 16 COOH, is a common saturated fatty acid. a. What is meant by the term ‘saturated’? 1 mark b. Stearic acid can be used as a source of energy. Write a chemical equation for the complete reaction between oxygen and stearic acid. 2 marks c. The fats and oils in food are usually made up of a complex mixture of saturated and unsaturated fatty acids. During processing, additives are often added to prevent spoiling. i. What class of food additive is used specifically to prevent oils becoming rancid? ii. How does the additive prevent oils becoming rancid? 2 marks Total 5 marks
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9 CHEM EXAM 2 SECTION B – continued TURN OVER Question 2 Lactic acid and alanine are both important chemicals in living systems. Their structures are O C H CH 3 C OH alanine H 2 N O C H CH 3 C OH lactic acid HO a. Give the name of the functional group common to both compounds. 1 mark b. Why is alanine classified as an amino acid but lactic acid is not? 1 mark c. In the boxes below, draw structures of two different possible organic molecules formed by a condensation reaction between lactic acid and alanine. 2 marks d. For one of the structures given in part c. , i. circle the new functional group formed and ii. name the functional group that you have circled. 2 marks Total 6 marks
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CHEM EXAM 2 10 SECTION B – continued Question 3 The energy content of food can be determined by completely burning a sample of the food in a bomb calorimeter and then calculating the energy released.
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