Angel International School - Manipay 1 st Term Examination November, 2015

Transcription

1 Grade 11B Angel International School - Manipay 1 st Term Examination November, 2015 Chemistry - I Duration: 1.00 Hour Part 1 1) A liquid boils at a temperature of 100 o C. Which other property of the liquid proves that it is pure water? a) It does not leave a residue when boiled. b) It freezes at 0 o C. c) It is neither acidic nor alkaline. d) It turns white anhydrous copper(ii) sulphate blue. Index No:- 2) a) nucleon number. b) number of electrons. c) number of neutrons. d) number of protons. 3) What is the mass of aluminium in 204 g of aluminium oxide, Al 2 O 3? a) 26 g b) 27 g c) 54 g d) 108 g 4) An excess of calcium hydroxide is added to an acidic soil. What happens to the ph of the soil? 5) Which of the following is a pure compound? a) ethanol b) petrol c) steel d) tap water 6) When chlorine water is added to a colourless solution of X, a dark brown solution is obtained. What is X? a) KCl b) KI c) NaBr d) NaF 7) Two particles X and Y have the composition shown in the table. The particles X and Y are a) metal atoms. b) non-metal atoms. c) negative ions. d) positive ions. 8) Which element is least likely to be found in a macromolecule? a) carbon c) oxygen b) hydrogen d) sodium 9) Which compound has both ionic and covalent bonds? a) ammonium chloride b) carbon dioxide c) ethyl ethanoate d) sodium chloride 1

2 10) Which two statements about a covalent bond are correct? 1) It can be formed between two metal atoms. 2) It can be formed between two non-metal atoms. 3) It is formed by the transfer of electrons between atoms. 4) It is formed by sharing electrons between atoms. a) 1 and 3 b) 1 and 4 c) 2 and 3 d) 2 and 4 11) The coverplate is removed from the gas jars shown in the diagram. After several days, the colour of the gas is the same in both jars. Which statement explains this change? a) Oxygen and bromine gases have equal densities. b) Oxygen and bromine molecules are in random motion. c) Oxygen and bromine molecules diffuse at the same rate. d) Equal volumes of oxygen and bromine contain equal numbers of molecules. 12) When 20 cm 3 of a gaseous alkene burns in an excess of oxygen, 60 cm 3 of carbon dioxide are formed. Both volumes are measured at r.t.p. What is the formula of the alkene? a) C 3 H 6 b) C 3 H 8 c) C 6 H 12 d) C 6 H 14 13) The energy profile diagram below is for a reaction P + Q R + S. Which statement is correct? a) The activation energy of the reaction is (H3 H1). b) The activation energy of the reaction is (H3 H2). c) ΔH is (H1 H2). d) ΔH is (H1 H3). 14) Dilute sulphuric acid is electrolysed using inert electrodes. Which equation represents the reaction at the anode (+ve)? 15) Which statement does not describe a property of a weak acid in solution? a) It forms a salt with sodium hydroxide. b) It has a ph of between 8 and 9. c) It is only partly dissociated into ions. d) It reacts with sodium carbonate to give off carbon dioxide. 2

3 16) What are the products when concentrated aqueous lithium chloride is electrolysed? 17) A solid deposit of element R is formed at the cathode(-ve) when an aqueous solution containing ions of R is electrolysed. Which statement about element R must be correct? a) R forms negative ions. b) R ions gain electrons at the cathode. c) R ions lose electrons at the cathode. d) R is above hydrogen in the reactivity series. 18) Which graph shows the changes in ph as an excess of hydrochloric acid is added to aqueous sodium hydroxide? 19) The diagrams show an experiment with aqueous ammonium chloride. 3

4 A gas, Y, is produced and the litmus paper changes colour. What are solution X and gas Y? 20) A catalytic converter in a car exhaust system changes pollutants into less harmful products. Which change does not occur in a catalytic converter? a) carbon dioxide carbon b) carbon monoxide carbon dioxide c) nitrogen oxides nitrogen d) unburned hydrocarbons carbon dioxide and water 21) Which two reagents could be used to prepare the insoluble salt copper(ii) carbonate? a) CuO(s) + Na 2 CO 3 (aq) b) CuO(s) + MgCO 3 (s) c) CuSO 4 (aq) + Na 2 CO 3 (aq) d) CuSO 4 (aq) + MgCO 3 (s) 22) The diagram shows a boat made from iron. Some magnesium blocks are attached to the iron below the water line. Why does the magnesium stop the iron from rusting? a) Magnesium reacts in preference to the iron. b) Magnesium reacts to form a protective coating of magnesium oxide on the iron. c) The magnesium forms an alloy with the iron. d) The magnesium stops oxygen in the water from getting to the iron. 23) Which statement about catalysts is correct? a) Catalysts are used in industry to reduce energy costs. b) Catalysts are used up during a reaction. c) Iron is used as a catalyst in the Contact Process. d) Transition metals do not make good catalysts. 24) The position of metal M in the reactivity series is shown. K, Na, M, Al, Zn, Fe, Pb, Cu, Ag Which method will be used to extract M from its ore? a) electrolysis of its molten oxide b) electrolysis of its aqueous sulphate c) reduction of its oxide by heating with hydrogen d) reduction of its oxide by heating with coke 4

5 25) The table shows pollutants and their possible effects. Which line is not correct? 26) Alloys are usually harder than the metals from which they are made. Which difference between the metals explains the greater hardness of alloys? a) atomic radii c) electrical conductivities b) densities d) relative atomic masses 27) Ammonia is made by a reversible reaction between nitrogen and hydrogen. The equation for the reaction is shown. What is the effect of increasing the pressure in this process? a) Less ammonia is formed. c) More ammonia is formed. b) Less heat is produced. d) The reaction slows down. 28) Which pollutant increases the growth of algae in rivers and streams? a) chlorine c) nitrate ions b) heavy metal ions d) sulphur dioxide 29) Experiments are set up to investigate the sacrificial protection of iron. In which test-tubes will the iron rust? a) X only b) Y only 30) The diagram shows the electrolytic production of aluminium. c) X and Z only d) Y and Z only What is the physical state of the aluminium oxide and aluminium during this process? 5

6 31) Which statements about the pollutant carbon monoxide are correct? 1) It is a colourless, odourless gas. 2) It is formed by incomplete combustion of natural gas. 3) It reacts with haemoglobin in the blood. a) 1 and 2 only b) 1 and 3 only c) 2 and 3 only d) 1, 2 and 3 32) The diagram shows some of the stages in the manufacture of ammonium sulphate. From which connecting pipe would a major leak most increase the ph value of rain? 33) Which formula represents a compound that will react with sodium carbonate to give off carbon dioxide? a) CH 3 OH c) CH 3 CO 2 H b) HCO 2 CH 3 d) CH 3 CO 2 C 2 H 5 34) Cholesterol is an organic molecule that occurs in the blood stream. What type of compound is cholesterol? a) an acid c) an alkane b) an alcohol d) an alkene 35) Which of these polymers is a protein? a) (C 2 H 3 Cl )n b) (C 2 H 3 NO)n c) (C 5 H 8 O 2 )n d) (C 6 H 10 O 5 )n 36) What is the structure of the product of the reaction between butene, CH 3 CH 2 CH=CH 2, and bromine, Br 2? a) CH 2 Br CH 2 CH 2 CH 2 Br c) CH 3 CHBr CH 2 CH 2 Br b) CH 2 Br CH 2 CHBr CH 3 d) CH 3 CH 2 CHBr CH 2 Br 37) The experiment shown is used to test potassium bromide crystals The lamp does not light. Distilled water is then added to the beaker and the lamp lights. Which statement explains these results? a) Electrons are free to move in the solution when potassium bromide dissolves. b) Metal ions are free to move when potassium bromide melts. c) Metal ions are free to move when potassium reacts with water. d) Oppositely charged ions are free to move in the solution when potassium bromide dissolves. 6

7 38) Which molecule has only four electrons involved in covalent bonds? a) H 2 S b) CO 2 c) Cl 2 d) N 2 39) Analysis of a sample of an oxide of nitrogen gave the following data. percentage by mass of nitrogen 47% percentage by mass of oxygen 53% What is the empirical formula of this oxide? [Ar-18, N-14, O-16] a) NO b) NO 2 c) N 2 O d) N 2 O 3 40) The diagram shows an outline of part of the Periodic Table. Which statement is not correct? a) The melting point of W is lower than that of Z. b) W and Z could react together and form a compound, WZ. c) X could form an oxide, X 2 O 3. d) Y could form an oxide, YO 2. ***** 7