Subject : Chemistry

Topic :


Class :

SS 1

Term :

1st Term / First Term


Part A Objectives

  1. Chemistry is defined as _____(a) a branch of knowledge which produces chemicals (b) the branch of science which deals with changes in matter (c) the oldest branch science (d) the branch of science which makes physics and biology career
  2. Scientific approach to discoveries follows the order which includes:______(a) Observation, hypothesis, and results (b) experiments, hypothesis and results (C) .further experiments and problems solving (d) theory, negative and positive results and experiments
  3. Chemical hypothesis is different from chemical law in that_____(a) hypothesis is a reasonable explanation to observations made while law is a statement from a scientist. (b) hypothesis is a reasonable explanation to observations while law is a statement which confirms the hypothesis after extensive tests. (C) hypothesis is not reasonable while law is reasonable. (d) none of the above
  4. Chemical changes around us includes all except;____ (a) rusting of iron nails  (b) sieving (c) fading of coloured cloth {d) decomposing of green leaves in a compost
  5. One of these professions has no need for chemistry ______A. Miners (b) Engineers (c) Philosophers (d) Geologists
  6. The simplest unit of Matter that retains its properties is called. (a) an atom (b) an element (c) an hydroxide (c) a molecule
  7. Of the basic particles that make up an atom, the one with the smallest mass is?_____ (a) a proton (b) a neutron (c) an x- particle (d) an electron
  8. The following are physical changes except: _____(a) melting of candle wax (b) Dissolving common salt in water (c) Freezing of water (d) Rotting of leaves.
  9. Which of the following is not a molecule of the same element. (a) O2(b) P4 (c) S8 (d)CO2
  10. The atomicity of O3 is ______(a) 1 (b) 2 (c) 3 (d )4
  11. Which of the following relative molecular mass has empirical formula CH2O (H=1 C=12, O=16). (a) 42 (b) 80 (c) 4 (d) 60
  12. The relative molecular mass of tetraoxosulphate(VI) acid is? (a) 98 (b) 49 (b) 49 (c) 96 (d) 106
  13. Chemical equations will provide all these except. (a) State of chemicals is solved (b) Direction of reaction (c) Mass of products (d) Reactants
  14. All pure samples of a particular compound contain the same elements combined in the same proportion by mass. The statement is the law of (a) Definite proportion (b) Multiple proportion (c)Conservation of mass or matter (d) Atomic proportion
  15. Which of these are found in the nucleus of an atom?
  16. A. electrons and protons B. electrons and neutrons C. protons and neutrons D. photons and electrons E. photons and neutrons.
  17. The type of bond between two atoms of an element with atomic number 7 is? A. ionic B. covalent C. hydrogen bond D. metallic bond E. coordinate covalent bond.
  18. The ON of phosphorus, P in PH3is? A. +2 B. -3 C. -1 D. +3
  19. Give the IUPAC name of the compound NO2. A. nitrogen dioxide B. nitrogen monoxide C. nitrogen (II) oxide D. nitrogen (iv) oxide
  20. Atomic number, Z, is the number of __________ in one atom an element. A. protons B. neurons C. electrons D. atoms


Part B Theory

  1. Define the term chemistry.
  2. Mention five changes that matter undergoes.
  3. Give the uses of chemistry in our day to day life.
  4. List at least five career opportunities in chemistry
  5. Explain any three of the career opportunities mentioned above.
  6. Mention five adverse effects of existence of chemistry in the world.
  7. What do you understand by hypothesis?
  8. Differentiate the terms hypothesis and theory
  9. Explain fully what you understand by scientific method?
  10. Give five reasons why chemistry is important in your life.
  11. Explain in detail two of the reasons given above.
  12. List three adverse effect of existence of chemistry in this world.
  13. Explain two of those adverse effects mentioned above.
  14. Explain the term scientific method full.
  15. What are the three fundamental units of all matter? Give their relative masses and charges.
  16. Describe their relative positions to one another in an atom.
  17. Name the two main part of an atom?
  18. Mention the three subatomic particles in an atom.
  19. Which particles are found in each part of the atom?
  20. List three sub atomic particles with their corresponding charges.