End Of Term I Examinations 2022 Senior One Chemistry

1 END OF TERM I EXAMINATIONS 2022 SENIOR ONE CHEMISTRY TIME: 1 HOUR NAME………………………………………………………… STREAM …………………… INSTRUCTIONS ➢ Answer all the questions ➢ Answers must be written in the spaces provided. 1. Racheal wants to carry out two chemistry experiments involving use of acids. Look at her opinion. (a) Using your knowledge of chemisry, Expalin with a reason whether you support or donot support Racheal’s opinion about the use of acids in chemistry experiments. (3 marks) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… I think it’s convenient to add water to acid when carrying out my chemistry experiments. Kityo. R 2 (b) State three other safety precauions that Racheal should concider when carrying out experiments in the laboratory. (3 marks) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 2. The figure below shows a kettle of boiling water (a) Describe the changes of state taking place in the figure above (3 marks) ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… (b) Using small circles of similar size to represent particles, show the arrangement of particles in the water and water vapour in the boxes below. (4 marks) Arrangement of particles in water Arrangement of particles in water vapour Water vapour Water droplets Kettle 3 3. Use the words in the list below to complete the following sentences by filling in the blank spaces (13 marks) (digestible, bodies, food, nutrients, diseases, detergents, food, dishes, useful, dirt, microorganisms, absorb, chemical, manufactured) (i) Digestion relies on chemical reactions between ……………………. and enzymes to break down large food substances into………………………that the body can……………………. (ii) Soap and ……………… are chemical substances that dissolve …………………. when we wash our clothes,………………………and………………….. (iii) Drugs are a product of chemistry knowledge and are …………………in treatment of ………………… (iv) Cooking is a ………………………. change that alters ………………. to make it more palatable, kills dangerous ……………………. and makes it …