Exam (elaborations)
AS & A Level CHEMISTRY 9701/21 Paper 2 AS Level Structured Questions May/June 2023 Authentic Marking Scheme
AS & A Level CHEMISTRY 9701/21 Paper 2 AS Level Structured Questions May/June 2023 Authentic Marking Scheme
[Show more]
Content preview
Cambridge International AS & A Level* 6 8 8 7 0 9 1 3 6 7 *
CHEMISTRY 9701/21
Paper 2 AS Level Structured Questions May/June 2023
1 hour 15 minutes
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS
● Answer all questions.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator.
● You should show all your working and use appropriate units.
INFORMATION
● The total mark for this paper is 60.
● The number of marks for each question or part question is shown in brackets [ ].
● The Periodic Table is printed in the question paper.
● Important values, constants and standards are printed in the question paper.
This document has 16 pages. Any blank pages are indicated.
DC (LK/FC) 308405/5
© UCLES 2023 [Turn over
, 2
1 Tellurium is an element in Group 16. The most common isotope of tellurium is 130Te. Its electronic
configuration is [Kr] 4d10 5s2 5p4.
(a) Complete Table 1.1.
Table 1.1
number of number of
nucleon number
neutrons electrons
130Te
[3]
(b) Identify the sub-shell in an atom of Te that contains electrons with the lowest energy.
............................................................................................................................................. [1]
(c) Construct an equation to represent the first ionisation energy of Te.
............................................................................................................................................. [1]
(d) (i) The radius of Te ions decreases after each successive ionisation.
State two factors that are responsible for the increase in the first six ionisation energies
of Te.
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) Sketch a graph in Fig. 1.1 to show the trend in the first seven ionisation energies of Te.
ionisation
energy / kJ mol–1
0
0 1 2 3 4 5 6 7
successive ionisation
Fig. 1.1
[2]
© UCLES 2023 9701/21/M/J/23
, 3
(e) Te reacts with F2 at 150 °C to form TeFx. Molecules of TeFx are octahedral with bond angles
of 90°.
Explain why TeFx is octahedral with bond angles of 90°.
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [2]
(f) TeFx reacts with water to form tellurium hydroxide and HF. The oxidation number of tellurium
does not change during this reaction.
(i) Construct an equation for the reaction of TeFx with water.
..................................................................................................................................... [1]
(ii) Name the type of reaction that occurs when TeFx reacts with water.
..................................................................................................................................... [1]
[Total: 13]
© UCLES 2023 9701/21/M/J/23 [Turn over
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller StudyTimeOT. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.16. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73918 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now