Chemistry Practice Exam

Transcription

1 Chemistry Prtie Exm Whih of the following is n element? A rop of merury. A splinter of woo. A rystl of sugr. A rop of wter. Whih of the following nswers ontins only elements? Soium, soium hlorie, mgnesium, mgnesium hlorie Oxygen, hlorine, soium, tin Cron ioxie, nitrogen, helium Wter, ir, sugr, potssium A soli is ull (not shiny) in pperne n yellow in olour. It is power whih oes not onut eletriity. It nnot e roken own into simpler sustnes. It is proly: metl ompoun n element non-metl.

2 4 Whih of the following is the orret formul for soium hlorie? NCl Nl 2 Nl NACL 5 The perioi tle is useful euse: it ontins the symols of ll the elements it groups together elements tht hve similr properties it hs metls in one re n non-metls in nother setion ll of the ove. 6 Whih of the following elements in the perioi tle woul you expet to hve similr properties to lium? Potssium Mgnesium Aluminium Snium. The next five questions refer to the following igrm whih shows setion of the perioi tle. (Note the letters re not the orret symols for elements.) 7 Whih of the following nswers shows elements tht re in the sme perio of this perioi tle? V,J W,V,Q, L M,O,Q X, Z, T, I 8 Whih element in the tle shown ove woul e n lkli metl? W V Z M

3 9 If hemil retion tkes ple etween elements W n T, n ioni ompoun will form. The formul of the ompoun woul e: W 2T WT 2 WT W 3T 10 Of the elements shown in this setion of the perioi tle whih one is likely to ret most vigorously with wter? I M V J 11 Whih of the elements in the tle woul e trnsition metl? V J X M 12 Whih of the following nswers ontins only elements tht exist s gses t room temperture? Lithium, soium, lium n mgnesium. Hyrogen, rgon n hlorine. Merury, oron, potssium n tin. Cron ioxie, nitrogen, oxygen n fluorine. The next three questions refer to the following informtion: Smnth n Jne were investigting the retions of ifferent elements. They trie urning severl elements in oxygen gs n otine the following results: Smple 1: Burnt rpily to proue white power n right white light. Smple 2: Burnt with right flme n proue olourless gs. Smple 3: Woul not urn. The three smples were lump of ron, piee of mgnesium rion n neon gs. 13 Whih of the following nswers orretly ientifies the elements? Smple 1 Smple 2 Smple 3 Option 1 Lump of ron Neon gs Mgnesium rion Option 2 Mgnesium rion Lump of ron Neon gs Option 3 Neon gs Mgnesium rion Lump of ron option 1 option 2 option 3

4 14 The white power proue when mgnesium urnt woul e: MgO 2 MgO Mg 2O Mg 2O 2 15 Neon i not ret euse: the oxygen ws not strong enough the toms o not nee to gin or lose eletrons from their vlene shell there ws not enough het it is gs. 16 How mny protons, neutrons n eletrons re there in one tom of eh of the following toms?(6 mrks) 17 Oxygen hs three isotopes, s shown elow. Desrie the similrities n the ifferenes etween them.(3 mrks) 18 Drw the eletroni onfigurtion for n tom of potssium.(3 mrks)

5 The next three questions refer to the following informtion: The following hemil eqution shows the retion etween mmoni n sulphuri i: 19 The numer of ifferent hemil ompouns in the retion re: two three four five. 20 The temperture of the mixture fter the retion hs ene will e: higher thn it ws t the strt ooler thn it ws t the strt the sme s it ws t the strt. 21 One wy to mke this retion our more quikly woul e to: more sulphuri i more mmoni ool the mixture het the mixture. 22 A hemil eqution is written elow. Some numers tht will lne the eqution hve een left out. The nswer tht orretly lnes this eqution is: X=9, Y=6, Z=6 X=6, Y=6, Z=6 X=3, Y=3, Z=3 X=4, Y=6, Z=9 The next two questions refer to the following hemil eqution: 23 The sustnes foun on the left hn sie of the eqution re lle: elements ompouns prouts retnts.

6 24 The numers require to lne the eqution, in their orret orer re: 1, 2, 3, 4 1, 13, 8, 9 2, 25, 16, 18 2, 25, 16, 20 The next four questions refer to the following informtion: Hyrohlori i is e to piee of zin. Bules pper on the surfe of the zin n then the piee of zin isppers. 25 Whih gs o you think hs een proue?(1 mrk) 26 Wht test oul you o to ientify this gs?(1 mrk) 27 Write hemil eqution for the retion whih hs tken ple.(2 mrks) 28 Some of the stuents omplin tht this retion ours too slowly. Wht tion oul you tke to mke the retion go fster?(1 mrk) Blne the following two equtions:(4 mrks) Complete the following questions y filling in the unerline spes:(6 mrks)

7 34 Stte the hrge of eh of the following (5mrks): proton neutron n eletron nuleus e tom 35. List five wys in whih the rte of retion my e inrese (5 mrks). 36. An experiment ws onute s shown in the igrm elow. CCO3(s) ws e to HCl(q). The flsk, ontents n lloon were weighe efore n fter the retion. The prouts of the retion re wter (H2O), ron ioxie gs (CO2) n solution of lium hlorie (CCl2). Write lne eqution (inluing sttes) for the retion ourring in the flsk.(2 mrks) Woul you expet the mss fter the retion to e greter thn, less thn or equl to the mss efore retion? Justify your hoie.(2 mrks) 37 The symol for soium is N n omes from its originl Ltin nme. Given this informtion, the Ltin nme for soium is most likely to e: A soinium B ntrium C Nullror D soium 1 38 Some elements re not foun in nture ut re syntheti, hving een me in the lortory. These elements often ey to eome other elements efore their existene n e proven. These elements re given temporry symols while sientists wit for the require proof. Whih of the following element symols is most likely temporry symol? A Uun B Rn C U D M 1

8 39 The melting n oiling points of the group 1 elements re shown in the tle elow. Group 1 Melting point ( C) Boiling point ( C) Li N 98??? K??? 760 R One melting point in the tle is missing. Whih of the following tempertures is it most likely to e? A 63 C B 42 C C 100 C D 232 C 1 40 One oiling point in the tle in question 3 is missing. Whih of the following tempertures is it most likely to e? A 883 C B 750 C C 1350 C D 700 C 1 41 Whih of the following oul explin the erese in melting n oiling points s you go own group 1? A Atoms get lrger s you move own the group. B Atoms get smller s you move own the group. C Atoms hve inresing numers of eletrons in their outer shell s you move own group 1. D Atoms hve stronger hol on their outer shell eletrons s you move own group Use the informtion given in the tle in question 3 ove to etermine wht stte lithium (Li) will e t. At 300 C, lithium (Li) will e : A soli B liqui C gs D plsm 1 43 Use the informtion given in the tle in question 3 ove to etermine wht stte ruiium (R) will e t room temperture (25 C): A soli B liqui C gs D plsm 1 44 Prefixes re ommonly use when nming ompouns to inite how mny toms of prtiulr element re in eh moleule. For exmple, CO2 is lle ron ioxie. The prefix i inites tht there re two oxygen toms in eh moleule. Other ommonly use prefixes re: 3 = tri 4 = qu 5 = pent 6 = hex 7 = sept 8 = ot Sometimes the letter is e to the prefix to mke the nme soun etter. For exmple, hex is sometimes hnge to hex. Use these prefixes to preit the nme of the ompoun PCl5. A phosphorus penthlorie B pentphosphorus hlorie C hexphosphorushlorie D phosphorus hlorie 1 45 Use the prefixes in the previous question to preit the hemil formul for sulfur hexfluorie: A SF6 B S6F C 6SF D S6F6 1

9 46 The nme of the ompoun NO is nitrogen monoxie. Wht is the mening of the prefix mon? A There is only one oxygen tom in the moleule. B There is only one nitrogen tom in the moleule. C There is only one moleule of NO. D There is only one single ovlent on in NO. 1 4 Stte the hrge of: 7 proton 4 7 neutron n eletron nuleus e tom 5 4 Mgnesium hs n tomi numer of 12. Stte how mny protons woul e in the nulei of its toms. Stte how mny eletrons woul e in eh of its toms. Stte the eletron onfigurtion of its toms when in their groun stte. Preit the most likely hrge of mgnesium ions. e The symol for soium ion is N+. Use this formt to stte the symol for mgnesium ion. 5 Use the informtion given elow to stte the perio n group numer of the following elements: Clium (eletron onfigurtion 2,8,8,2). Lithium (eletron onfigurtion 2,1). Fluorine (tomi numer 9). Argon (tomi numer 18). Preit the most likely hrges of ny ions forme y the following elements. Clium (eletron onfigurtion 2,8,8,2) Lithium (eletron onfigurtion 2,1). Fluorine (tomi numer 9). Argon 4 Rell the ifferent types of oning y mthing them with the term tht est ientifies them: Boning metlli ioni Term shre eletrons eletron se ovlent hrge toms 3 Fluorine (F) is n element in group 17. The retion of fluorine gs (F2) with hyrogen sulfie (H2S) is shown y the eqution: F2 + H2S S + 2HF Chlorine (Cl) is nother group 17 element. Use this informtion to preit its retion with hyrogen sulfie. 2 Cron C is group 14 element n hlorine Cl is group 17 element. Both n omine to form moleule CCl4. Use this informtion to preit the hemil formuls of moleules forme from the following group 14 n group 17 elements: silion Si n hlorine Cl le P n fluorine F 4 2

10 List five wys in whih the rte of retion my e inrese. 5 1 EExplin the two wys in whih inresing the temperture n help to inrese the rte of retion Exmine the igrm of the wter yle shown. Ientify the proesses ourring t 1, 2, 3, 4 n 5 in tht orer. A evportion; preipittion; run-off; onenstion; trnspirtion B preipittion; evportion; trnspirtion; onenstion; run-off C evportion; preipittion; run-off; trnspirtion; onenstion D trnspirtion; onenstion; run-off; preipittion; evportion 1 48 Ientify the est esription of wht glol wrming is. A perios of glol wrming our etween perios of glition B greenhouse gses in the tmosphere use glol wrming C glol wrming egn fter the Inustril Revolution D uring perios of glol wrming se levels fll exposing more ln 1 49 Stte two mesures or initors you oul use to etermine the helth of the shool pon. 50 Whih sttement oes NOT esrie greenhouse gses or the effet they hve? A Nitrogen n oxygen re greenhouse gses tht sor the short-wve rition oming into Erth s tmosphere from the Sun. B Wter vpour n ron ioxie in the tmosphere hve no effet on the short-wve rition oming into Erth s tmosphere from the Sun. C Greenhouse gses trp het lose to the surfe of the Erth keeping it wrmer thn it woul e without those gses. D Cron ioxie n methne sor long-wve rition n re-emit it in ll iretions inluing k to Erth. 1 2