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   –  1 In which option do the three  particles each have the same number of electrons? ACl  – Br  – I    –  B F Ne  Na + C K  + Ca + Br  –  ! i +  Na + K  +  #h$ does neon %as&  Ne& diffuse faster than carbon dio'ide %as& C(  ? ANeon atoms have the lower mass) B Neon does not form molecules) C Neon is a noble %as) !Neon is less dense than air) * #hich rea%ent could be used to distin%uish between dilute nitric acid and dilute h$drochloric acid? A a+ueous  barium chloride B a+ueous silver nitrate C a+ueous sodium h$dro'ide ! copper,II- carbonate . /he conical flas0 contains compound  which is  present in solid& liuid and %aseous states) gaseous Xsolid Xliquid X #hich statement is correct? AA %aseous  molecule has a lower mass than a liuid  molecule) B 2ner%$ is released when  chan%es from liuid to solid) C iuid  is at a hi%her temperature than solid )! iuid  molecules vibrate about fi'ed  positions) 3 4C 25 667 8696:61:(:N:67  * 8 #hich statement is alwa$s true when two atoms  ;oin to%ether  b$ a covalent bond? A(ne atom is a metal& the other atom is a non<metal) B (ne atom loses one electron& the other atom %ains one electron) C /he two atoms share one electron) !/he two atoms share two electrons) = /he dia%ram shows the structures of diamond and %raphite) diamondgraphite #hich propert$ do these substances have in common? A/he$ are %iant structures) B /he$ can act aslubricants) C /he$ can conduct electricit$) !/he$ contain onl$ covalent bonds) 9 Calcium reacts with  phosphorus to form the ionic compound calcium  phosphide) #hich ions will this compound contain? A Ca + and > *–  B Ca + and > 8–  C Ca – and > *+ ! Ca – and > 8+ 3 4C 25 667 8696:61:(:N:67 ?/urn over   1  . @ All of the followin% substances can conduct electricit$) #hich substances conductivit$ is not due to the movement of electrons? A aluminium B %raphite C lithium chloride ! mercur$ 7 A sample of h$dro%en is a mi'ture of the two isotopes  H and  H    ) 1 1 /he relative atomic mass of o'$%en is 1=) #hat are  possible values of the relative molecular mass of different molecules of water formed b$ the   combination of o'$%en and h$dro%en? 1 1@  17 * 6 A1 onl$ B 1 and  onl$ C 1 and * onl$ ! 1&  and * 7 Calcium reacts with water as shown) Ca,s- +   (,l-  Ca,(-  ,a- + B  ,%- #hat is the total mass of the solution that remains when .6 % of calcium reacts with 166 % of water? A8@ % B 9. % C 1*@ % !1.6 % 16 #hat  products are formed when concentrated a+ueous potassium chloride is electrol$sed? at the anode ,positive- at the cathode ,ne%ative- A B C ! chlorine chlorine o'$%eno'$%enh$dro%en  potassium h$dro%en  potassium 3 4C 25 667 8696:61:(:N:67  8 11 $dro%en reacts with o'$%en as shown in the euation below)   ,%- + (  ,%-    (,l-ow much %as will remain if  dm * of h$dro%en are reacted with 1 dm * of o'$%en at room temperature? A6 dm * B 1 dm * C  dm * !* dm * 1 /wo cells& > and D& containin% different liuids& were connected in series with a  batter$& a suitable  lamp and inert electrodes& as shown in the dia%ram) lamp PQ For which pair of liuids did the lamp li%ht up? in > in D A B C ! concentrated sodium chloride solution copper,II- sulfate solution ethanol mercur$ concentrated su%ar solution  propanol molten lead,II-  bromide dilute h$drochloric acid 3 4C 25 667 8696:61:(:N:67 ?/urn over  =
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