Circular Motion Essay

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Words: 589
Pages: 3
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4.4, 4.5 HW MS
1. (i) 1

(ii) 1 (iii) CH3CH=CHCOOH 1
[3]

2. (a) (i) propyl methanoate (1) not propanyl
• A wrong reagent or no reagent scores zero
• An incomplete reagent such as silver nitrate for Tollens, or potassium dichromate loses the reagent mark, but can get both observation marks
• penalise observations which just say colour change occurs or only state starting colour
(ii) Reagent: NaHCO3 (1)
Observation with C: no reaction (1)
Observation with D: effervescence (1) 4 for C and D NOT Tollens
Test an identified (hydrogen) carbonate acidified K2Cr2O7 acidified KMnO4 correct metal UI or stated indicator PCl5
Observation with C no reaction goes green goes colourless no reaction no change no reaction observation with D bubbles or CO2 no change no change bubbles or H2 red or correct colour pH 3 – 6.9 (misty) fumes

(b) (i) Reagent: pentan-2-one (1) or 2-pentanone but not pent-2-one or pentyl
(ii) Reagent: Tollen’s or Fehling’s (1) Observation with E: no reaction (1) Observation with F: silver mirror or red ppt (1) 4 for E and F
Test Tollens Fehlings or Benedicts iodoform or I2/NaOH acidified K2Cr2O7 Schiff’s observation with E no reaction no reaction yellow (ppt) no change no reaction observation with F silver or mirror or grey or ppt red or ppt not red solution no reaction goes green goes pink [8]

3. (a) (i) (ii) ester (1) solvent, flavourings (1)
(iii) conc H2SO4 (1) in same physical state (1) 6
(b) C4H10O + 6O2  4CO2 + 5H2O (1) 1
[7]

4. (a) Reagents NaBH4 (1)
Type of reaction reduction (1) 2
(b) (i) Reagents(s) K2Cr2O7 (1) H2SO4 (1)
Conditions reflux (1)
(ii) CH3CH2CH2OH + 2[O]  CH3CH2COOH + H2O (1) 4
(c) (i) Structure
Name propyl propanoate (1)
(ii) 3 (f) CH3CH2CO or C3H6O + 4 O2 (1)  3 CO2 + 3H2O (1) 2
[11]

5. (a) (i) correct graphical formula for tertiary alcohol allow CH3 not C2H5 (1) 2-methylbutan-2-ol / 2-hydroxy-2-methylbutane / 2-methyl-
2-hydroxybutane award name mark even if it follows incorrect formula (1) 2
(ii) graphical formula of pent-1-ene (1) graphical formula of pent-2-ene (1) 2 accept geometrical isomers of pent-2-ene if clearly shown to be different
(iii) dehydration / elimination (1) 1
(iv) no H atoms on C atom next to C–OH / three methyl groups on C (1) 1 [6]

6. (a) NaBH4 (1) 1
(b) nucleophilic addition (1) (1) 5
(c) (i) hexanedioic acid (1)
(ii) C6H10O  C6H10O4
Mr = 98 (1) Mr = 146 (1)
2.40 g  × 146 = 3.58 g (1) 4
[10]

7. (a) (i) ethyl ethanoate
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