Write spd electronic configuration for an atom of copper. Write the equation for the first ionisation energy of nitorgen

Transcription

1 Question one Write spd electronic configuration for an atom of copper. Question two Write the equation for the first ionisation energy of nitorgen Question three Explain the pattern of ionisation energies for the third short period. Question four Draw a Lewis diagram for SO 4 2-

2 Question five What shape is SF 5 -? Question six Which of the following molecules is polar? SO 3, SO 4 2-, SCl 2, CCl 4, H 2 O, CO 2 Question seven Explain the trend in atomic radius for the third short period. Question eight Draw a Lewis diagram for PCl 5.

3 Question nine What shape is a molecule of PCl 5? Question ten What shape is [Cu(NH 3 ) 4 ] 2+? Question eleven What is the oxidation state and colour of VO 2 2+? Question twelve What colour is the MnO 4 ion?

4 Question one Write an equilibrium expression for the reaction: 2SO 2(g) + O 2(g) > 2SO 3(g) Question two PCl 5 PCl 3 + Cl 2 K 500C = If [Cl 2 ] = moll -1 and [PCl 3 ] = 1.32 moll -1 Calculate [PCl 5 ] at equilibrium. Question three I f the volume of the system PCl 5 (g) < > PCl 3(g) + Cl 2(g) is halved, what will happen to the amount of Cl 2 produced? Question four (five points) If you mix 40mL of 1.5M NH 3 with 10mL of 0.10M CaCl 2 will a precipitate of Ca(OH) 2 from? K s (Ca(OH) 2 ) = 1.3 x pka(nh 4 + )= 9.26

5 Question five (2 points) 25mL of 1 x 10-3 M SrCl 2 is mixed with 15mL of 2.00 x 10-3 M Na 2 SO 4. Will a precipitate of SrSO 4 form? K s (SrSO 4 ) = 7.6 x 10-7 Question six A solution has a ph of What is [OH - ]? Question seven Calculate the ph of 0.150M HNO 2. K a (HNO 2 ) = 4.5 x 10-4 Question eight (2 points) What is the ph of a 0.4M NH 3 solution? K b (NH 3 ) = 1.81 x 10-5

6 Question nine What is the ph of a buffer made by adding mole of HOAc (ethanoic acid) and mole of NaOAc to enough water to make a 0.600L solution. K a (HOAc) = 1.8 x 10-5 Question ten Draw a sketch of the titration curve when 0.05M KOH is added to 20mL of 0.100M CH 3 COOH solution. pka(ch 3 COOH) = 4.75

7 Question one What would you observe if chlorine gas was bubbled through a solution of potassium bromide? Question two What would you observe if oxalic acid and iodate ions were mixed? Question three Write a balanced ionic equation for the reaction between acidified iodate (IO 3 - ) and sulfite (SO 3 2- ). Question four What would you observe is potassium dichromate and sodium sulfite ions were mixed?

8 Question five Write a balanced ionic equation for the reaction between iron(ii) sulphate and acidified manganate (VII). A purple solution turns orange. Question six Write a balanced ionic equation for the reaction between hydrochloric acid (HCl) and solid MnO 2.A colourless solution is formed and a pungent gas that turns lead acetate paper black. Question seven Write oxidation and reduction half equations for the discharge of a dry cell. MnO 2 is converted to Mn 2 O 3. The case of the cell is made from zinc. Question eight In the lead-acid accumulator battery, Pb + PbO 2 + H 2 SO 4 > 2PbSO 4 + 2H 2 O a) Write the half equation for the positive terminal b) Write the half equation for the negative terminal.

9 Question nine a) Calculate the cell potential for an aluminium iodine cell. Al/Al 3+ E 0 = 1.66 I 2 /I E 0 = 0.54 b) Write the correct cell notation for this cell. c) At which electrode is reduction occurring? Question ten The standard potential for the reduction of Pb 2+ to Pb in this cell is 0.36 V. If the cell has a potential of 2.05 V calculate the reduction potential for the other half reaction. Question eleven Question twelve

10 Question one Draw the graphical formula for trans 1,2 dichloro but-1-ene Question two What is the name of the major product formed when 1,2 dichlor but-1-ene and hydrogen chloride are combined? Question three Write a balanced equation for the complete oxidation of methanol with acidified dichromate. Question four What reagent identifies a tertiary alcohol?

11 Question five What reagent identifies an aldehyde (alkanal)? Question six What reagent identifies an unsaturated compound? Question seven What reagent will convert pentanoic acid into pentanoyl chloride? Question eight Name the ester formed from the reaction between butanoic acid and proan-2-ol.

12 Question nine What reagent is used to convert propan-1-ol into aminopropane? Question ten Draw a dipeptide showing CH 3 CH(NH 2 )COOH combined with CH 3 C(CH 3 )(NH 2 )COOH Question eleven Show how 1,6 dihexanoic acid and 1,4 butandiol can form a polyester. Question twelve Who invented the water filled condenser?

13 Question number 1 [Ar]3d 10 4s 1 2 N(g) > N + (g) + e Set one Group answer correct 3 Same electron shell, increasing nuclear charge = greater ionisation energy needed Bonus if glitches explained. 4 5 Square pyramid 6 SCl 2 and H 2 O 7 As you go across the period ionisation energy increases except for the transistion elements and where a sub shell is full or half full e.g. dips from Ca to Sc, Mn to Fe, Zn to Ga 8 9 Bipyramid or hexahedron 10 tetrahedral 11 +2, violet 12 purple

14 Set two Group Question number 1 Kc = [SO 3 ] 2 /[SO 2 ] 2 [O 2 ] 2 [PCl 5 ] = moll -1 3 less answer correct 4 (5 points) [OH - ] = 4.66 x 10-3, IP = x 10-7, no ppt 5 No I.P. = 3.52 x cf 7.6 x [OH-] = ph = ph = ph = 4.74 (no calculation should be needed)

15 Set three Group Question number answer 1 Solution turns straw coloured/brown correct 2 Solution turns from purple to brown 3 2IO H + + 5SO 3 2- > I 2 + H 2 O + 5SO Orange to green 5 5Fe H + + MnO 4 - > 5Fe H 2 O + Mn H + + 2Cl - + MnO 2 > Mn 2+ + Cl 2 + 2H 2 O 7 Zn > Zn e - 2MnO 2 + 2H + + 2e - > Mn 2 O 3 + H 2 O 8 a) 2.20V b) pt/i 2,I - //Al 3+ /Al, c) iodine to iodide. 9 PbO 2 + 2e - + SO H + > PbSO 4 + 2H 2 O V 11 12

16 Question number 1 Trans form drawn Set four Group answer correct 2 1, 2,2 trichlorobutane 3 2CH 2 OH + Cr 2 O H + > 2CHOOH + 2Cr H 2 O 4 Lucas or zinc chloride/ 5 Tollen s reagent or ammoniacle silver nitrate 6 Bromine/bromine water 7 Ammonia (NH 3 ) 8 Methyl ethyl butanoate Leibig