<p>G.H.S CHEMISTRY HOLIDAY WORK SEPT, 2012</p><p>S.1</p><p>1. Which one of the following is false about a luminous flame?</p><p>A. it consists of 4 zones B. it is very hot</p><p>C. it is sooty D. it is yellow in colour</p><p>2. A non-luminous flame is suitable for heating in the laboratory because</p><p>A. it is very hot and non-sooty B. it is very bright and hot C. it contains a lot of carbon particles D. it has 3 zones</p><p>3. The substance that is responsible for blackening glass in a luminous flame is</p><p>A. methane gas B. carbon particles C. dust particles D. gas particles</p><p>4. When the air hole of a Bunsen burner is closed the flame produced is</p><p>A. steady B. blue in colour C. yellow in colour D. very hot</p><p>5. The apparatus used for strong heating of small volumes of solids is called</p><p>A. a test tube B. a beaker C. ignition tube D. a boiling tube 6. Which of the following results into a physical change?</p><p>A. heating of ammonium chloride B. burning of a candle C. rusting of iron D. heating of copper</p><p>7. Particles of matter possess the greatest kinetic energy when in: A. gaseous state B. liquid state C. solid state D. molten state</p><p>8. The following gases exist as diatomic molecules except:</p><p>A. nitrogen B. oxygen C. hydrogen D. helium</p><p>9. The force of attraction between particles of different kind is called:</p><p>A. Adhesion force B. Repulsion force C. Cohesion force D. Gravitation force</p><p>10. According to Dalton’s atomic theory, matter is made up of countless small particles called:</p><p>A. molecules B. atoms C. elements D. ions</p><p>11. Which one of the following statements is not correct?</p><p>A. All atoms are electrically neutral B. Heating of a liquid increases the kinetic energy of its particles C. The force of attraction in solids is uniform for all particles D. None of the above</p><p>12. A volatile liquid is one which</p><p>A. evaporates easily B. less dense than water C. has a high boiling point D. is denser than water</p><p>13. The apparatus used to scoop small volumes of solids from bottles in the laboratory is called a:</p><p>A. glass rod B. stirring rod C. spatula D. watch glass</p><p>14. Which one of the following is a mixture?</p><p>A. copper B. sodium C. bronze D. iron</p><p>15. The three fundamental particles of an atom are:</p><p>A. electrons, neutrons and protons B. electrons, neutrons and deuterium C. protonium, deuterium and electrons D. proton, protonium and neutron</p><p>16. The chemical symbol of copper is:</p><p>A. Co B. Cp C. Cu D. Cr 17. When small particles are strongly illuminated and viewed through a microscope, they appear to be moving in a random zigzag motion. This is because</p><p>A. of the effect of bright light B. the particles are warm C. the particles are bombarded by air particles D. the air particles are knocked around by the smoke particles</p><p>18. The region of a non-luminous gas that contains a lot of un burnt gas is:</p><p>A. The pale blue or purple zone B. The cool inner zone C. The blue zone D. The green or blue zone</p><p>19. A gas X has molecular formula X3. X can be described as</p><p>A. polyatomic B. diatomic C. tri-atomic D. monatomic</p><p>20. This element is a non-metal but conducts electricity like metals:</p><p>A. Plastic B. Graphite C. Sulphur D. Phosphorous</p><p>21. (a) Define the following terms:</p><p>(i) Physical change (ii) Chemical change</p><p>(b) Give four differences between a physical and a chemical change:</p><p>Physical change Chemical change</p><p>1. 1.</p><p>2. 2.</p><p>3. 3.</p><p>4. 4.</p><p>( c ) State whether the following are physical or chemical changes: (i) Rusting of iron……………………………………………………</p><p>(ii) Combustion of petrol…………………………………………….</p><p>(iii) Burning of a candle………………………………………………</p><p>(iv) Photosynthesis………………………………………………….</p><p>(v) Magnetization of iron………………………………………….</p><p>(vi) Melting of candle wax…………………………………………</p><p>22 (a) Draw a well labeled diagram of:</p><p>(i) Luminous flame (ii) Non-luminous flame</p><p>(b) Give four ways in which a luminous flame differs from a non-luminous flame</p><p>1.</p><p>2. 3.</p><p>4.</p><p>23. (a) Define the following terms:</p><p>(i) Matter</p><p>(ii) Cohesion</p><p>(b) What are the three states of matter?</p><p>(i)………………………………………………..</p><p>(ii)………………………………………………</p><p>(iii)………………………………………………</p><p>( c ) Give three ways in which the particles of solids differ from those of gases 1.</p><p>2.</p><p>3.</p>