Set 18 U C E Chemistry Paper 1 2026 Standard Exam

@2026 𝑈.𝐶.𝐸 𝐶ℎ𝑒𝑚𝑖𝑠𝑡𝑟𝑦 𝑆𝑒𝑟𝑖𝑒𝑠 𝐵𝑦 𝑊𝑎𝑠𝑎𝑘𝑖𝑛𝑎 𝐽𝑢𝑙𝑖𝑢𝑠 𝑀.0787093081 1 545/1 CHEMISTRY Paper 1 2026 2 hours SET 18 Uganda Certificate of Education CHEMISTRY Paper 1 2 hours INSTRUCTIONS TO CANDIDATES: This paper consists of two Sections; A and B. It has six examination items. Section A has two compulsory items. Section B has two Parts; I and II. Answer one item from each part. Answer four items in all. Answers to Section A must be written in the spaces provided while those of section B must be written on the answer booklet(s) provided. Any additional item(s) answered will not be scored. Use where necessary; Ca = 40; Mg=24; C = 12, O = 16; 1 mole of a gas occupies 22.4 dm³ at s.t.p. Item No. Basic Code Weighted Score Scores’ Initials 1 T D E 2 C X I 3/4 P S B 5/6 N M Be Total Weighted Score Name: …………………………………………………………………………………. Signature …………………….. For Scorers’ Use Only Total Weighted Score Initials @2026 𝑈.𝐶.𝐸 𝐶ℎ𝑒𝑚𝑖𝑠𝑡𝑟𝑦 𝑆𝑒𝑟𝑖𝑒𝑠 𝐵𝑦 𝑊𝑎𝑠𝑎𝑘𝑖𝑛𝑎 𝐽𝑢𝑙𝑖𝑢𝑠 𝑀.0787093081 2 SECTION A Answer all items in this section Item 1 A dairy processing group produces flavoured yoghurt for sale in a trading centre. They notice that after a few days of storage, the yoghurt separates and develops a watery layer. They have been using natural gelatin (extracted from animal bones and fish skins), but they are advised to use polyvinyl compounds to improve product stability. Some members are concerned about health effects and want to understand the difference between natural and polyvinyl stabilizers. Task: (a) State the category of the ingredients and the function of each ingredient. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ (b) Describe the side effect(s) associated with the ingredients. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ (c) State the; i. similarities of the ingredients. __________________________________________________________________________ __________________________________________________________________________ …