Name : ………………………………………………………( ) Form : 4………… Section A: Answer ALL questions. Blacken your answers in the spaces provided in page 3. 1. Which of the following should be done if a hypothesis is rejected in an experiment? A Collecting more data B Make a new inference C Make a new hypothesis D Make a scientific theory 7. 2. The relative atomic mass of an element is the number of times A The mass of an atom is greater than the mass of one carbon-12 atom B The mass of an atom is greater than the mass of one oxygen atom C The mass of an atom is greater than 1/12 of the mass of one carbon-12 atom D The mass of a molecule is greater than 1/12 of the mass of one carbon-12 atom A sample of ammonia gas is cooled. Which of the following is true about the velocity and the size of its particles? Velocity of the particles Size of the particles A Increases Decreases B Increases No change C Decreases No change D Decreases Decreases 8. Diagram below shows two types of gases filled in two balloons. 3. A patient is diagnosed of having cancer. Which isotope is used to treat the patient? A Carbon-14 B Sodium-24 C Phosporus-32 D Cobalt-60 Which statement is correct about the number of particles in argon gas? [Relative atomic mass: Ar = 40, O = 16] A Half of oxygen gas B Same as in oxygen gas C More than in oxygen gas D Less than in oxygen gas 4. The proton number of atom R is 14 and its relative atomic mass is 28. Which statement is correct about R? A The mass of 1 atom of R is 28 g B The molar mass of R is 28 g mol-1 C 14 g of R contains 6.02×1023 atoms D Atom R has 14 protons, 14 electrons, and 28 neutrons 9. Which pair of compound and its relative formula mass is correctly matched? [Relative atomic mass: Ba = 137, S = 32, O = 16, Zn = 65, C = 12, Cl = 35] 5. Which of the following is a chemical reaction? A Crumpling a sheet of paper B Melting an ice cube C Breaking a glass D Burning of wood A B C D 6. Iodine-129 and iodine-131 are isotopes. Which statement is correct? [Proton number of iodine = 53] A Iodine-129 has the same number of neutrons as iodine-131 B Iodine-129 has less number of electrons than iodine-131 C Iodine-131 has 53 electrons and 78 neutrons D Iodine-129 has 53 protons and 76 electrons Compound Relative formula mass BaSO4 ZnCO3 ZnCl2 ZnSO4 125 135 233 161 10. Diagram below shows the electron arrangement of a chlorine atom. 1 Which inter-conversion involves the release of energy? A Steam → Ice B Water → Steam C Ice → Water D Ice → Steam 15. How many hydrogen molecules are there in 24 dm3 of the gas? [The molar volume of any gas is 24 dm 3 mol−1 at room temperature and pressure; Avogadro constant: x mol−1] A 12x C 2x B x2 D x Which statement is true about this atom? A The number of valence electrons is 17 B The total number of electrons is 7 C The nucleon number is 17 D The proton number is 17 11. The following statements refer to the contributions of a scientist in the development of ideas about atomic structure. 16. What is the mass of ethane gas, C2H6, which occupies a volume of 498 cm3 at room temperature and pressure? [Relative atomic mass: C = 12, H = 1; Molar volume of gas = 24 dm 3 mol−1 at room temperature and pressure] A 0.62 g C 358.56 g B 14.94 g D 622.50 g Discovered proton Most of the mass of the atom is in the nucleus The electrons move in empty space Who was the scientist? A Neils Bohr B John Dalton C J.J Thomson D Ernest Rutherford 17. How many carbon atoms will have the same mass as six oxygen atoms? [Relative atomic mass: C = 12, O = 16] A 8 C 4 B 5 D 2 12. Which of the following particles contain 10 electrons? [Proton number: , F = 9, Mg = 12, S = 16,K = 19] I K+ II Mg2+ III F− IV S2A I and II C II and III B I and III D III and IV 18. A balloon contains 6.02 x 1021 of gas particles. What is the number of moles of the gas in the balloon? A 0.01 mol C 1.0 mol B 0.1 mol D 10.0 mol 13. What is the number of neutrons in the isotope of uranium 235 92𝑈 ? A 92 C 235 B 143 D 327 19. Which compound has the empirical formula of CH2O? A HCOOH B CH3COOH C CH3COOCH3 D HCOOC2H5 20. An oxide of element X has the empirical formula of X2O3. 2.24g of element X reacts completely with 0.96g of oxygen. What is the relative atomic mass of X? [Relative atomic mass: O=16] A 112 C 25 B 56 D 17 14. Diagram below shows the inter-conversion of the states of matter of a substance. 2 Answer: =A= 1 =A= 2 =A= 3 =A= 4 =A= 5 =A= 6 =A= 7 =A= 8 =A= 9 10 =A= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= =B= =C= =D= 11 12 13 14 15 16 17 18 19 20 =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= =A= =B= =C= =D= Section B: Answer ALL questions in the spaces provided. 1. Table 1 shows the proton number and nucleon number of atom for the element carbon, oxygen, aluminium and chlorine. Elements Proton Number Nucleon number Carbon 6 12 Oxygen 8 16 Aluminium 13 27 17 Table 1 35 Chlorine (a) What is meant by nucleon number? [1 mark] (b) (i) State the type of particles consists in aluminium metal. [1 mark] (ii) Draw the atomic structure for aluminium atom. [2 marks] (c) (i) Write the electron arrangement for oxygen atom. [1 mark] (ii) State the valence electron for oxygen atom. [1 mark] 3 (d) Carbon-12 and Carbon-14 are the isotopes of carbon. (i) What is meant by isotopes? [1 mark] (ii) State the use of carbon-14 in archeology field. [1 mark] (e) Based on the kinetic theory of matter, describe the arrangement and movement of particles of chlorine at room temperature. Arrangement of particles: ______________________________________________________________________ Movement of particles: ________________________________________________________________________ [2 marks] 2. Table 2 shows the melting point and boiling point of four substances. Substances W Melting point (°C) -10 Boiling point (°C) 60 X 800 1 400 Y -95 -33 Z 80 140 Table 2 (a)(i) What is meant by melting point? [1 mark] (a)(ii) Draw the arrangement of particles of W at room temperature. [1 mark] (b)(i) Substance Z is a chemical compound named as acetamide. Draw the set-up of apparatus to determine the melting point of substance Z. [2 marks] (b)(ii) Sketch the graph of temperature against time for substance Z when it is heated from room temperature until it 4 reaches a temperature of 100°C. [3 marks] (c) The smell of curry cooking in the kitchen spreads to the living room. Based on the kinetic theory of matter, state the process involved. Explain your answer. _____________________________________________________________________________________________ _____________________________________________________________________________________________ _____________________________________________________________________________________________ _____________________________________________________________________________________________ [3 marks] --- END --- 5