At a high temperature, calcium oxide reacts with carbon to form calcium carbi e, Cac,.
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1 At a high temperature, calcium oxide reacts with carbon to form calcium carbi e, Cac,. CaO(s) + 3C(s) ~ CaC 2 (s) + CO(g) (a) Calcium oxide reacts with carbon to make 128 g of calcium carbide. Calculate (i) the relative formula mass of calcium carbide f ~f r;). CcL+C+C (ii) the amount, in moles, of calcium carbide made in the reaction. (iii) the minimum amount, in moles, of carbon that is required to make this amount of calcium carbide. /'711:lo C~, C~ C ~ ) ~ 3 LQ ~ VY\.Q ~ C ;2 b NLQckd t5.. ~ 0 = ~ (iv) the minimum mass, in g, of carbon required. (b) Calcium carbide reacts with water to make the gas ethyne, C 2 H 2, and a compound of calcium. Complete the chemical equation for this reaction: (ii) Ethyne, C 2 H 2, is highly flammable. Predict the products of the complete combustion of ethyne.... kf0:9...~~ty.( ~) UJ.L UlJlbOAv d La XLctv 24 /
2 " " '""" """""""""~"" """', Leave blank Copper() carbonate reacts with dilute hydrochloric acid. The equation for the reaction is + 2HCl(aq) } CuChCaq) + An excess of copper() carbonate was to a solution mol of hydrochloric acid. (i) Calculate mol will react with / 10 f \ ( 0) rna (ii) Calculate the mass, in of this amount of coppercj) carbonate. ) (:2 +. ~ volume gas at room temperature and atmospheric will be Trwrnprt in this rea'cnc,n any gas at room temperature and atmospheric CD
3 ......_ (0) A 5.55 g sample of calcium chloride (M r = ll) is dissolved in water to make a solution. (i) Calculate the amount, in moles, in the sample of calcium chloride. ~~ h~ ::: 5,55 o /M~...%.1' Q) :: Q.:...Q.5... (ii) What amount, in moles, of sulphuric acid is needed to react completely with the calcium chloride solution? CC, C1 ; + H.)..JO r.) Co. [r[jc{ f ~ l~ !.... :.:...~... o (iii) Calculate the relative formula mass of calcium sulphate. Use data from the Periodic Table on page 2....~.±...Q...±...'*..(9..)... ~...Lf..'?..T...?:.?.:~...lf.(~~)...!... :$..~... (iv) Calculate the mass, in grams, of calcium sulphate fonned. o... r~tl9.....c.~.q:l...~...c~~.$.9.v: ~ co~'> 0 / 0,5' ; 0 J OS 22 <9 yyl CVY) CaS (Jv = V1 x (\.!\ V' = 0 f or x J3 b.1; ~ =~ f 3
4 r..l '...c ' '. "..;.. " " ",""T.., (~) The following equation represents a reaction used to prepare the salt lead() nitrate, Leave blank n this experiment the amount of nitric acid used was mol. (i) The concentration of the dilute nitric acid used was mol dm 3. the volum~f dilute nitric acid used. V= V1 0 0 <too Calculate e (ii) n this experiment, mol ofcarbon dioxide gas was produced. Calculate the volume, in cm 3, that this amount of carbon dioxide occupies at room temperature and pressure (rtp). (molar volume of any gas = cm 3 at rtp) Va) nr y: ~Lr( 000 o 10 :ZOG X :;)cr (000 / Q10 ~c;!,..." Lf' ' J J 23
5 ~ An oven cleaner contains the alkali sodium hydroxide. (a) A solution of the oven cleaner in distilled water is titrated with hydrochloric acid. Some of the following pieces of apparatus are used in this experiment. 'r Leave blank A B C D (') ~( E F G H ] 1r Choose from the letters A to G to identify the pieces of apparatus in the table below. Name of apparatus Letter Beaker Burette Conical flask B r A Funnel ]) Pipette H (5) (b) t is important to wear eye protection when using an alkali. What property of alkalis makes this safety precaution necessary?...cq.((p..j./.'{~ i..c.r.v.t.9:.0t ,
6 ......_......_ ~.. ~~::: (c) The diagrams show the readings on the burette before and after a student added the hydrochloric acid in one titration. before after Use the diagrams to help you complete the table. Burette reading after adding acid (cm 3 ) Burette reading before adding acid (cm 3 ) Volume of acid added (cm 3 ) (d) A second student did the titration four times. The table shows the results. ;;20 res /" go (gl85 Burette reading after adding acid (cm 3 ) (~) 1 Burette reading before adding acid (cm 3 ) Volume of acid added (cm 3 ) Titration results to be used (..') V ~ (i) Which titration results should be used to calculate the average volume of acid added? Place ticks (..') in the table. (ii) Use your ticked results to calculate the average volume of acid added. (:20 "' 35+ ;;(0 r fs) ~ lo. Q J 1/11/ "'rl Turn over
7 ,,_="c...,. " A student wanted to find the concentration of asolutl~:ofni::aci~''~ ~~:: She placed a 25.0 cm 3 sample of the nitric acid solution in a conical flask and titrated it with mol dm 3 sodium hydroxide solution, using phenolphthalein as an indicator. The phenolphthalein changed colour after she added a total of cm 3 of the sodium hydroxide solution. The equation for the reaction is: (a) State the colour change of the phenolphthalein....(9.j9.~~.~p...±?....p...~ (b) (i) Calculate the amount, in moles, of sodium hydroxide used in the titration. h, :::. C V 0) ~ao ;><.. (0 J C) ~ S o " 00 L~:2.1 (ii) Calculate the concentration, in mol dm 3, of the nitric acid., ' c : r 0) 004~1 hl1yvg O/OO~':L.. 0, O~~..?1_1b g (~) Yv\~0:L",,3 (c) (i) Calculate the relative formula mass of sodium nitrate. ~fw l No..+N + 3(0) ~) ~3+ (4 + 3((~) l..."...7";...,,......_!.l..,./
8 nil (ii) Calculate the mass of sodium nitrate fonned in the titration. VY X Mr O/OO~;L x ~5 rt J...._._..,_. _ " _... (c) The reaction between dilute phosphoric acid and sodium hydroxide solution is represented by the equation.. j J i! A sample of sodium hydroxide solution was titrated against dilute phosphoric acid. t was found that 25.0 cm 3 of sodium hydroxide solution was neutralised by cm 3 of phosphoric acid of concentration mol dm 3. (i) Calculate the amount, in moles, of phosphoric acid used in the titration. o ~::: CV 0 ::: X 0 Of:t3 (ii) Calculate the amount, in moles, of sodium hydroxide that would react with this amount of phosphoric acid. ro \o [+.3 PO~. (j) " N G\.O H ': 3 C ;00 l84s :; ( 3 X 0 f ()a <;S C}S' ) :) 0 roo55~35 (iii) Calculate the concentration, in mol dm 3, of the sodium hydroxide solution. (Q,f c= v ()ro~s o (~~lj ht\g 1/ c1 \ty\ 3 Q9 (Total 16 marks) ~... Lj Turn 2~ver
At a high temperature, calcium oxide reacts with carbon to form calcium carbide, CaC,.
- ~~Y---~--------'~ '~~L ~ U A-NT, T""?t11 VE. ~ G.-8~Q,-C---,- \ p ic ---,kf r~ ~,,-,----:-r ----"-,. " At a high temperature, calcium oxide reacts with carbon to form calcium carbide, CaC,. CaO(s) +
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