Exam (elaborations)
AqA A-level CHEMISTRY Paper 2 Organic and Physical Chemistry JUNE 2023
AqA A-level CHEMISTRY Paper 2 Organic and Physical Chemistry JUNE 2023
[Show more]
Content preview
AqAA-level
CHEMISTRY
Paper 2 Organic and
Physical Chemistry
, 2
Do not write
outside the
Answer all questions in the spaces box
provided.
This0 question
1 is about rates of reaction.
Figure 1 shows apparatus used to measure the rate of reaction when an
acid reacts with an excess of solid sodium hydrogencarbonate, NaHCO3
When different monoprotic organic acids are used, the rates at which gas
escapes can be used to compare the strengths of the acids.
A timer is started when the NaHCO3 is added to the
acid and the mass of CO2 gas lost is recorded at
regular intervals.
(It is assumed that any change in mass is due to the loss of CO2)
Figure 1
0 1 .1 Suggest a reason why using a conical flask instead of a beaker would
give more accurate results in this experiment.
[1 mark]
*02
IB/M/
* Jun23/7405/2
, 3
Do not write
outside the
Figure 2 shows the results of this experiment when 25.0 cm3 of a box
2.23 mol dm–3 solution of ethanoic acid reacts with an excess of
NaHCO3
Figure 2
0 1
.2 Use Figure 2 to calculate the rate of reaction at 2
minutes. Deduce the units of your calculated rate.
[3 marks]
Rate Units
0 1 .3 Chloroethanoic acid is a stronger acid than ethanoic acid.
Sketch, on Figure 2, the curve you would expect when 25.0 cm 3 of a 2.23
mol dm–3 solution of chloroethanoic acid reacts with an excess of
NaHCO3
Suggest why chloroethanoic acid is a stronger acid than ethanoic acid.
[3 marks]
7
*03
IB/M/
* Jun23/7405/2
, 4
Turn over ► Do not write
outside the
*03
IB/M/
* Jun23/7405/2
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 diasmarkm. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £12.61. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80796 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