Chemistry > EXAM > OCR A Level Chemistry A (H432) Chemistry B (H433)-With marking Scheme (All)

OCR A Level Chemistry A (H432) Chemistry B (H433)-With marking Scheme

Document Content and Description Below

A solid organic compound can be purified by recrystallisation. Which statement(s) about recrystallisation is/are true? 1 The organic compound is more soluble in hot solvent. 2 The hot solution is cooled before the pur ...

A solid organic compound can be purified by recrystallisation. Which statement(s) about recrystallisation is/are true? 1 The organic compound is more soluble in hot solvent. 2 The hot solution is cooled before the purified organic compound is collected. 3 The melting point of the purified organic compound is lower than the impure compound. A 1, 2 and 3 B Only 1 and 2 C Only 2 and 3 D Only 1 Your answer [1] 2. When are insoluble impurities removed during recrystallisation? A when the hot solution is filtered B as the solution cools C when the crystals are filtered off D when the crystals are washed Your answer [1] Created in ExamBuilder 1 © OCR 2020 OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 6: Synthesis of an organic solid Practice Exam Questions and Mark Scheme 2(a). Benzoic acid, C6H5COOH, is added to some foods as a preservative. A student prepares benzoic acid as outlined below. Step 1 The student mixes 4.00 cm3 of phenylmethanol, C6H5CH2OH, (density = 1.04 g cm−3) with sodium carbonate and aqueous potassium manganate(VII), as an oxidising agent. The mixture is heated under reflux. Step 2 The resulting mixture is cooled and then acidified with concentrated HCl . Impure crystals of benzoic acid appear. Step 3 The student recrystallises the impure crystals to obtain 1.59 g of pure benzoic acid. In Step 1, sodium carbonate, Na2CO3, makes the reaction mixture alkaline. Write an ionic equation to show how carbonate ions form an alkaline solution in water. [1] (b). In Step 2, explain why the mixture must be acidified so that crystals of benzoic acid appear. [1] (c). Write the overall equation for the preparation of benzoic acid from phenylmethanol. Use [O] for the oxidising agent. [1] (d). Calculate the percentage yield of benzoic acid. Give your answer to 3 significant figures. percentage yield = ...................................................... % [3] (e). In Step 3, describe how the student can recrystallise the impure crystals to obtain pure benzoic acid.

[Show More]

Last updated: 3 years ago

Preview 1 out of 18 pages

Buy Now

Instant download

Preview of OCR A Level Chemistry A (H432) Chemistry B (H433)-With marking Scheme

Buy this Document to get the Full Access Instantly

Provided by Students Who Aced it

We Verify Document Content to Gurantee Accuracy

Buy Now

Report Copyright Violation

Reviews( 0 )

EXAM

$13.00

Instant download

149

0

Document information

Connected school, study & course

About the document

Uploaded On

Jul 01, 2021

Number of pages

18

Written in

All

Seller

Prof.Exams

Member since 5 years

68 Documents Sold

Reviews Received

12

2

2

0

1

Additional information

This document has been written for:

Uploaded

Jul 01, 2021

Downloads

0

Views

149

Topic Tags

Recommended For You

Get more on EXAM »

Preview of OCR A Level Chemistry B (Salters) Scentific literacy in chemistry (H433/02) Question Paper

Same Course Code

$10

47 Pages

OCR A Level Chemistry B (Salters) Scentific literacy in chemis...

Apr 20, 2026

Related document

Preview of OCR A Level Chemistry B (Salters) Fundamentals of Chemistry (H433/01) Question Paper And M

Same Course Code

$10

59 Pages

OCR A Level Chemistry B (Salters) Fundamentals of Chemistry (H...

Apr 20, 2026

Related document

Preview of OCR A Level Chemistry B (Salters) Practical skills in chemistry (H433/03)

Same Course Code

$10

62 Pages

OCR A Level Chemistry B (Salters) Practical skills in chemistr...

Apr 20, 2026

Related document

Preview of OCR A Level Chemistry B (Salters) H433/03 Practical skills in chemistry JUNE 2025 Combined

Same Course Code

$7

37 Pages

OCR A Level Chemistry B (Salters) H433/03 Practical skills in...

Apr 22, 2026

Related document

Preview of OCR A Level Chemistry B (Salters) H433/02 Scientific literacy in chemistry JUNE 2025 Combi

Same Course Code

$7

46 Pages

OCR A Level Chemistry B (Salters) H433/02 Scientific literacy...

Apr 22, 2026

Related document

Preview of OCR A Level Chemistry B (Salters) H433/01 Fundamentals of Chemistry JUNE 2025 Combined Que

Same Course Code

$7

55 Pages

OCR A Level Chemistry B (Salters) H433/01 Fundamentals of Chem...

Apr 22, 2026

Related document

Preview of OCR A Level Chemistry B (Salters) H433/03 Practical skills in chemistry Combined Question

Same Course Code

$7

37 Pages

OCR A Level Chemistry B (Salters) H433/03 Practical skills in...

Apr 15, 2026

Related document

Preview of >_ AS Level Chemistry B (H033) || A Level Chemistry B (H433) || Data Sheet Oct 2021

Same Course Code Popular Match

$6

4 Pages

>_ AS Level Chemistry B (H033) || A Level Chemistry B (H433) |...

Mar 20, 2026

Related document

Preview of OCR GCE Chemistry A H432/01: Periodic table, elements and physical chemistry Advanced GCE

Same Course Code Popular Match

$1

24 Pages

OCR GCE Chemistry A H432/01: Periodic table, elements and phys...

Apr 19, 2026

Related document

Preview of GCE Chemistry A H432/03: Unified chemistry || Mark Scheme OCT 2021

Same Course Code Popular Match

$1

21 Pages

GCE Chemistry A H432/03: Unified chemistry || Mark Scheme OCT...

Apr 19, 2026

Related document

Preview of OCR GCE Chemistry B (Salters) H433/03: Practical skills in chemistry Advanced GCE Mark Sch

Same Course Code Popular Match

$1

12 Pages

OCR GCE Chemistry B (Salters) H433/03: Practical skills in che...

Apr 19, 2026

Related document

Preview of OCR GCE Chemistry B H433/02: Scientific literacy in chemistry Advanced GCE Mark Scheme for

Same Course Code Popular Match

$1

13 Pages

OCR GCE Chemistry B H433/02: Scientific literacy in chemistry...

Apr 19, 2026

Related document

Preview of Achieve for Interactive General Chemistry, 1e by Macmillan Learning (Test Bank )

Same Course Popular Match

$25

550 Pages

Achieve for Interactive General Chemistry, 1e by Macmillan Lea...

Apr 26, 2026

Related document

Preview of Forensic Chemistry 3rd Edition by Suzanne Bell | Solutions Manual

Same Course Popular Match

$25

86 Pages

Forensic Chemistry 3rd Edition by Suzanne Bell | Solutions Man...

Apr 26, 2026

Related document

Preview of Solution Manual for Elementary Principles of Chemical Processes 4th Edition by Richard Fel

Same Course Popular Match

$19

63 Pages

Solution Manual for Elementary Principles of Chemical Processe...

May 02, 2026

Related document

Preview of Separation process principles 2nd edition By J. D. Seader, Ernest J. Henley | SOLUTIONS MA

Same Course Popular Match

$16

1287 Pages

Separation process principles 2nd edition By J. D. Seader, Ern...

May 02, 2026

Related document

Preview of Recent Advances in Natural Products Science 1st Edition By Ahmed Al-Harrasi, Saurabh Bhati

Same Course

$25

250 Pages

Recent Advances in Natural Products Science 1st Edition By Ahm...

May 04, 2026

Related document

Preview of Principles of Biomedical Sciences and Industry Translating Ideas Into Treatments 1st Editi

Same Course

$25

427 Pages

Principles of Biomedical Sciences and Industry Translating Ide...

May 04, 2026

Related document

Preview of eBook Atkin's Physical Chemistry 12th edition By Peter Atkins, Julio de Paula, James Keele

Same Course

$30

5508 Pages

eBook Atkin's Physical Chemistry 12th edition By Peter Atkins,...

May 03, 2026

Related document

Preview of eBook Atkins' Physical Chemistry 11th Edition By Peter Atkins, Julio de Paula, James Keele

Same Course

$27

2381 Pages

eBook Atkins' Physical Chemistry 11th Edition By Peter Atkins,...

May 03, 2026

Related document

More related documents below

Browse more EXAM

More From Prof.Exams

View all Prof.Exams's documents »

$13.00

Instant download

What is Scholarfriends

Scholarfriends.com Online Platform by Browsegrades Inc. 651N South Broad St, Middletown DE. United States.

Get to know us

About Us
Privacy Statement
Refund Policy
Terms and Conditions
Contact Us
Blog
HTML Sitemap
Sellers Directory (A–Z)

We are here to help

We're available through e-mail, Twitter, and live chat.
FAQ
Questions? Leave a message!

Follow us on

Instagram
Linktree
X (Twitter)

Useful links

Join our Subreddit

Solutions Manuals for Accounting, Business, Economics and Management Text Books. The Popular and the Latest.

Popular NURSING Test Banks

Sellers Directory (A–Z)

We accept

payment cards

Copyright © Scholarfriends · High quality services·