YEAR 10 CHEMISTRY SEMESTER 1 EXAM 1. Which piece of apparatus is a burrette. (1) 2. Which method separates a mixture of sugar and glass? (1) 3.In which row are the substances correctly classified? (1) 4.a) Define diffusion. (2) b) When a jar of coffee is opened, people in all parts of the room soon notice the smell. Use the kinetic theory to explain how this happens. (3)
c) Explain why diffusion is faster in gases than in liquids. (3) 5. Some nickel(ii) sulfate solution was carefully placed in the bottom of a beaker of water. The beaker was then covered and left for several days. a) Describe what you would see after:(4) (i) a few hours (ii) several days. b) Explain your answer to a using your ideas of the kinetic theory of particles. (4) c) What is the name of the physical process that takes place in this experiment?(1) 6. (a) The electronic structures of five atoms, A, B, C, D and E, are shown.
b) Complete the table to show the number of electrons, neutrons and protons in the vanadium atom and calcium ion shown. (3) 7. b) Potassium chloride is an ionic compound. Complete the diagram to show the electron arrangementin the outer shells of the ions present in potassium chloride. Give charge on both ions.
8. Balance the following equations. (2) 9. (2) (4) 10. a) Define ionic bonding. (2) b) List two examples of ionic compounds. (2)
11. In a chromatography experiment, eight coloured substances were spotted onto a piece of filter paper. Three were the basic colours red, blue, and yellow. The others were unknown substances, labelled A–E. This shows the resulting chromatogram: a) Which one of substances A–E contains only one basic colour? (3) b) Which contains all three basic colours? (1) c) The solvent was propanone. Which of the three basic colours is the most soluble in propanone? (1)