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Chemistry question
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  1 The diagram shows part of the Periodic Table. HeBCNOFNeA l  SiPSC l  ArFeCoNiCuZnGaGeAsSeBrKr I Xe Answer these questions using only the elements shown in the diagram. Each element can be used once, more than once or not at all.Write the symbol for  (i) an element which is in Group 5 and Period ,! # (ii) an element which is used as a gas in balloons,! # (iii) an element which forms ions in aqueous solution which gi$e a white precipitate on reaction with aqueous sil$er nitrate,! # (iv) an element which forms an ion of type  X %  ,! # (v) anelement which is a catalyst for the hydrogenation of al&enes,! # (vi) two elements which combine to form a compound whichcauses acid rain.and! #'Total( )*  2 +ydrogen reacts with chlorine to ma&e hydrogen chloride. The reaction is eothermic.The reaction can be represented by the equation below.+ %% + -  l  %%  l    + %%  l - + %%  l     H / % 01 &23mol (a) A miture of 4.5 g of hydrogen and 14 g of chlorine is allowed to react. (i) Which gas, hydrogen or chlorine, is in ecessEplain your answer....................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................. !4# (ii) alculate the energy released when 4.5 g of hydrogen reacts completely with chlorine gas.   !  # (b) Eplain why the reaction is eothermic, in terms of the energy changes that ta&e place during  bond brea&ing and bond ma&ing.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... !#  Total 3 0  The structures of three organic molecules are shown below.  (a) 6escribe an industrial process to ma&e ethanol from ethene.......................................................................................................................................................................................................................................................................................................................................................................................................................... !# (b)  7ame a reagent that can be used to con$ert ethanol into ethanoic acid...................................................................................................................................... ! # (!) Ethanol and concentrated ethanoic acid react to form the ester ethyl ethanoate. (i)  7ame the other product formed................................................................................................................................... (ii)  7ame the catalyst used in this reaction................................................................................................................................... (iii) The reaction between ethanol and ethanoic acid can reach dynamic equilibrium.What is meant by the term dynamic equilibrium ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... !1# ( ) Ethanoic acid is a wea& acid. 8t reacts with magnesium gi$ing a gas and a magnesium salt. (i) What is meant by the term weak acid  ...................................................................................................................................................................................................................................................................................................................................................................................................... (ii)  7ame the gas formed................................................................................................................................... (iii) What is the formula of the magnesium salt formed............................................................................................................................. !#    & hlorine is in Group 988 of the Periodic Table.hlorine reacts with aqueous potassium iodide to form potassium chloride and iodine. (a) 6escribe what you would see when chlorine is added to aqueous potassium iodide................................................................................................................................................................................................................................................................................. ! # (b) Write the equation for the reaction between chlorine and potassium iodide....................................................................................................................................... ! # (!) When chlorine reacts with potassium iodide, iodine molecules are formed.4 8  % : 8 4 - 4e  %  Eplain why the formation of an iodine molecule from iodide ions is an eample of oidation................................................................................................................................................................................................................................................................................ ! # ( ) Astatine is another element in Group 988. 8t is highly radioacti$e and so is $ery difficult to study. (i) Predict, with reasons, whether astatine will react with aqueous potassium iodide. .................................................................................................................................. .............................................................................................................................. ! # (ii) Write the equation for the reaction between astatine and sodium. .................................................................................................................................. .............................................................................................................................. ! # 'Total( 5*
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