NATIONAL QUALIFICATIONS CURRICULUM SUPPORT Chemistry Consumer Chemistry Predicting Physical Properties of Molecules from Functional Groups [HIGHER]
The Scottish Qualifications Authority regularly reviews the arrangements for National Qualifications. Users of all NQ support materials, whether published by Learning and Teaching Scotland or others, are reminded that it is their responsibility to check that the support materials correspond to the requirements of the current arrangements. Acknowledgement Learning and Teaching Scotland gratefully acknowledges this contribution to the National Qualifications support programme for Chemistry. © Learning and Teaching Scotland 2010 This resource may be reproduced in whole or in part for educational purposes by educational establishments in Scotland provided that no profit accrues at any stage. 2 CONSUMER CHEMISTRY (H, CHEMISTRY) © Learning and Teaching Scotland 2010
Contents Introduction 4 Questions 5 Answers 19 CONSUMER CHEMISTRY (H, CHEMISTRY) 3 © Learning and Teaching Scotland 2010
INTRODUCTION Introduction This resource supports the Consumer Chemistry unit of the revised Higher Chemistry. The resource has the following purposes: 1. to allow students to become familiar with identifying functional groups within everyday molecules, some of which have complex structures 2. to enable students to relate intermolecular forces to the functional groups present 3. to enable students to explain the physical properties of molecules based on the functional groups present. 4 CONSUMER CHEMISTRY (H, CHEMISTRY) © Learning and Teaching Scotland 2010
QUESTIONS Questions Question 1 Benzaldehyde is an aromatic compound with an almond-like smell, which is used in flavourings and perfumes. Circle and name the functional group on the benzaldehyde molecule below. C H O Benzaldehyde CONSUMER CHEMISTRY (H, CHEMISTRY) 5 © Learning and Teaching Scotland 2010
QUESTIONS Question 2 Cholesterol is an important molecule present in the human body. However, high levels of a certain type of cholesterol in the blood are linked with illnesses such as heart disease and strokes. CH 2 CH CH 2 CH 2 C C CH CH 2 CH CH CH 2 CH 2 C CH CH 2 CH 2 CH HO CH 3 CH 3 CH CH 3 CH 2 CH 2 CH 2 CH 2 Cholesterol CH 3 CH 3 (a) Identify the two circled functional groups on the cholesterol molecule. (b) Explain why this compound has a high boiling point. 6 CONSUMER CHEMISTRY (H, CHEMISTRY) © Learning and Teaching Scotland 2010
QUESTIONS Question 3 β-carotene is a member of a family of chemicals called the carotenoids. It is responsible for the orange colour in many fruits and vegetables, including carrots. CH 2 CH 2 CH 2 C C C CH 3 CH 3 CH 3 CH CH C CH 3 CH CH CH C CH 3 CH CH CH CH C CH 3 CH CH CH C CH 3 CH CH C C CH 2 CH 2 CH 2 C CH 3 CH 3 CH 3 -carotene (a) Which functional group is present throughout the structure of β-carotene?
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