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1、1 Use of the Data Booklet is relevant to this question. What could be the proton number of an element that has three unpaired electrons in each of its atoms? A5B13C15D212 Use of the Data Booklet is relevant to this question. The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive pro
2、ton numbers in the Periodic Table. What is the order of their first ionisation energies? 3 Which gas closely approaches ideal behaviour at room temperature and pressure? A ammonia B carbon dioxide C helium D oxygen4 Some bond energy values are listed below.These bond energy values relate to the foll
3、owing four reactions. P Br2 2Br Q 2Cl Cl2R CH3 + Cl CH3Cl S CH4 CH3 + H What is the order of enthalpy changes of these reactions from most negative to most positive? A P Q R S B Q R S P C R Q P S D S P Q R 5.Given the following enthalpy changes,What is the standard enthalpy change of formation of io
4、dine trichloride, ICl3(s)?A+176 kJ mol-1B-88 kJ mol-1C-176 kJ mol-1D-214 kJ mol-16 Ammonium nitrate, NH4NO3, can decompose explosively when heated.NH4NO3 N2O + 2H2O What are the changes in the oxidation numbers of the two nitrogen atoms in NH4NO3when this reaction proceeds?A-2, -4B+2, +6C+4, -6D+4,
5、-47 The Haber process for the manufacture of ammonia is represented by the following equation. N2(g) + 3H2(g) 2NH3(g)H = -92 kJ mol-1Which statement is correct about this reaction when the temperature is increased? A Both forward and backward rates increase. B The backward rate only increases. C The
6、 forward rate only increases. D There is no effect on the backward or forward rate. 8 Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, X, reacts with an excess of chlorine to form 5.287 g of a compound with formula XCl2. What is metal X? A barium B calcium C magnesi
7、um D strontium 9Which mass of gas would occupy a volume of 3 dm3 at 25 C and 1 atmosphere pressure?1 mol of gas occupies 24 dm3 at 25 C and 1 atmosphere pressure.A3.2 g O2 gasB5.6 g N2 gasC8.0 g SO2 gasD11.0 g CO2 gas10.The table gives the concentrations and pH values of the aqueous solutions of two
8、 compounds, X and Y. Either compound could be an acid or a base.Student P concluded that X is a strong acid. Student Q concluded that the extent of dissociation is lower in X(aq) than in Y(aq). Which of the students are correct? A both P and Q B neither P nor Q C P only D Q only 11 Swimming pool wat
9、er can be kept free of harmful bacteria by adding aqueous sodium chlorate(I), NaOCl. This reacts with water to produce HOCl molecules which kill bacteria. OCl -(aq) + H2OOH-(aq) + HOCl (aq)In bright sunshine, the OCl - ion is broken down by ultra-violet light. OCl -(aq) + uv light Cl -(aq) + O2(g) W
10、hich method would maintain the highest concentration of HOCl (aq)? A acidify the pool water B add a solution of chloride ions C add a solution of hydroxide ions D bubble air through the water12 Na2S2O3 reacts with dilute HCl to give a pale yellow precipitate. If 1 cm3 of 0.1 mol dm-3 HCl is added to
11、 10 cm3 of 0.02 mol dm-3 Na2S2O3 the precipitate forms slowly. If the experiment is repeated with 1 cm3 of 0.1 mol dm-3 HCl and 10 cm3 of 0.05 mol dm-3 Na2S2O3 the precipitate forms more quickly. Why is this? A The activation energy of the reaction is lower when 0.05 mol dm-3 Na2S2O3 is used. B The
12、reaction proceeds by a different pathway when 0.05 mol dm-3 Na2S2O3 is used. C The collisions between reactant particles are more violent when 0.05 mol dm-3 Na2S2O3 is used. D The reactant particles collide more frequently when 0.05 mol dm-3 Na2S2O3 is used. 13How does concentrated sulfuric acid beh
13、ave when it reacts with sodium chloride?A as an acid onlyB as an acid and oxidising agent C as an oxidising agent only D as a reducing agent only 14 X is a salt of one of the halogens chlorine, bromine, iodine, or astatine (proton number 85). The reaction scheme shows a series of reactions using a s
14、olution of X as the starting reagent. What could X be? A sodium chloride B sodium bromide C potassium iodide D potassium astatide15 The percentage of ammonia obtainable, if equilibrium were established during the Haber process, is plotted against the operating pressure for two temperatures, 400 C an
15、d 500 C. Which diagram correctly represents the two graphs?16 Consecutive elements X, Y, Z are in the third period of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point. What could be the identities of X, Y and Z? A aluminium, silicon, phosphorus B magnesium, aluminium, silicon C silicon, phosphorus, sulfur D sodium, magnesium, aluminium 17 Which property of Group II el
