2 1. Define the term chemistry (2mks) ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. 2. What is a drug? (1mk) ....................................................................................................................................... ………………………………………………………………….……………………………… Give two drugs that are commonly abused by the youth. (2mks) ……………………………………………………………………………………….………… …………………………………………………………………………………………………. 3. Describe how a mixture of salt and sand can be separated (4mks) ....................................................................................................................................... ……………………………………………………………………………………...………….. …………………………………………………………………………………………………. ……………………………………………………………………………………..………..…. ……………………………………………………………………………………….………… ……………………………………………………………………………………..………....... ……………………………………………………………………………………….……….... 4. State 3 sources of heat used in the laboratory. (3mks) …………………………………………………………………………………………………. 2 3 ………………………………………………………………………………………………… …………………………………………………………………………………………………. 5. A mixture of kerosene and water was shaken and left to separate as shown in the diagram below: (2mks) P W What is the identity of; (i) P ………………………………..…….. (ii) W ………………………………….…. 6. Most laboratory apparatus are made of glass. Explain. (3mks) ……………………………………………………………………………………………….. ……………………………………………………………………………………………… …………………………………………………………………………………………………. ………………………………………………………………………………………………… …………………………………………………………………………………………………. 7. State three ways of preventing rusting 3 (3mks) 4 ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………. 8. Define the following terms as used in chemistry (2mks) a) Matter ………………………………………………………………………………………………. …………………………………………………………….………………………………… b) Laboratory ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ………………………………………………………………………………………………… 9. List five (5) benefits of studying chemistry to the society. (5mks) ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… 4 5 ………………………………………………………………………………………………… ………………………………………………………………………………………………… 10.State 2 differences between the physical properties of solids and gases ( 2 m k s ) ……………………………………………………………………………………….... ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………. Apparatus Name Function Used to scoop solid substances from containers Tongs Mortar and pestle Used to hold water for rinsing vessels and for adding water to vessels with narrow neck. Teat pipette 5 6 Used in heating solid substances that require strong heating. Gas jar Used to support crucible on a tripod stand when it is being heated. Deflagrating spoon Complete the table below. (10mks) 11.State two laboratory rules that; a) P r e v e n t s injury to the learners (2mks) ……………………………………………………………………………………………… ……………………………………………………………………………………………… b) P r e v e n t s occurrence (2mks) 6 of fire 7 ……………………………………………………………………………………………… ……………………………………………………………………………………………… 13.Using a diagram, show the changes in states of matter and processes that occur as matter changes from one state to another. (4mks) 14. Use the diagram below to answer the questions that follow. a) N a m e the lab apparatus (1mks) ………………………………….………………………….. 7 shown above 8 b) Name the parts A, B, C and D (4mks) A…………………………………….. B…………………………….……….. C…………………………………….. D…………………………………….. c) S t a t e t h e function of the parts labelled above (4mks) A ……………………………………………………………………………………………… ………… ……………………………………………………………………………………………… ………… B ……………………………………………………………………………………………… ………… ……………………………………………………………………………………………… ………... 8 9 C ……………………………………………………………………………………………… ……….. ……………………………………………………………………………………………… ……….. D ……………………………………………………………………………………………… ……….. ……………………………………………………………………………………………… ……….. 15. a) Differentiate between sublimation and deposition (2mks) ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………. b) Give 3 examples of substances that undergo sublimation. (3mks) ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………. 9 10 End 10
