100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9−1) CHEMISTRY B (TWENTY FIRST CENTURY SCIENCE)J258/03 BREADTH IN CHEMISTRY (HIGHER TIER) FOR MAY 2024 $12.19   Add to cart
Quickly navigate to
Preview
  2.  
  3. Chemistry
  4.  
  5. Chemistry

Exam (elaborations)

OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9−1) CHEMISTRY B (TWENTY FIRST CENTURY SCIENCE)J258/03 BREADTH IN CHEMISTRY (HIGHER TIER) FOR MAY 2024
 8 views  0 purchase

OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9−1) CHEMISTRY B (TWENTY FIRST CENTURY SCIENCE)J258/03 BREADTH IN CHEMISTRY (HIGHER TIER) FOR MAY 2024

Preview 4 out of 45  pages

Document information

  • October 16, 2024
  • 45
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • ocr merged question paper and mark scheme gcse 9

Written for

All documents for this subject (2121)

Seller

avatar-seller
williesmaish2999

Reviews received

Content preview

Friday 17 May 2024 – Morning
GCSE (9−1) Chemistry B (Twenty First Century Science)
J258/03 Breadth in Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes




Turn over

, 2
1 Fertilisers are used to increase the growth of plants.

They are added to soil to provide essential plant nutrient elements.

(a) Nitrogen is one essential plant nutrient element.

Name two other essential plant nutrient elements.

1 .......................................................................................................................................................

2 .......................................................................................................................................................
[2]

(b)
(i) State one disadvantage of the over-use of synthetic fertilisers.

..........................................................................................................................................................

..................................................................................................................................................... [1]

(ii) Suggest why farmers still use synthetic fertilisers despite their disadvantages.

..........................................................................................................................................................

..................................................................................................................................................... [1]




© OCR 2024

, 3
(c) An example of a synthetic fertiliser is ammonium nitrate, NH4NO3.

Ammonium nitrate is produced when ammonium hydroxide, NH4OH, reacts with nitric acid, HNO3.

NH4OH(aq) + HNO3(aq) NH4NO3(aq) + H2O(l)

The relative formula masses for the reactants and products are shown in the table.

NH4OH HNO3 NH4NO3 H 2O
Relative formula mass 35.0 63.0 80.0 18.0

Calculate the atom economy for the formation of NH4NO3.

Use the equation:

mass of atoms in desired product
atom economy = × 100%
total mass of atoms in reactants

Give your answer to 1 decimal place.




Atom economy = ..................................................... % [4]




© OCR 2024 Turn over

, 4
2 Sodium chloride is an ionic compound.

(a) Fig. 2.1 shows three models of the arrangement of ions in sodium chloride.

Fig. 2.1

_
_ + _ + _
+ _ + _ + _ +
_ + _ + _
+ _ _ +
+ _ _ +
_ + _
+ _ +
+_ _+
+


Model A Model B Model C

(i) Describe the attraction between ions in sodium chloride.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..................................................................................................................................................... [2]

(ii) Which two statements about the limitations of the models in Fig. 2.1 are true?

Tick (✓) two boxes.

Model A does not show the relative sizes of the ions.

Model C does not show the 3-D arrangement of ions.

None of the models show that sodium chloride is a compound
containing two elements.

Only one model shows that a chloride ion is an anion.
[2]




© OCR 2024

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

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 williesmaish2999. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $12.19. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

85443 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$12.19
  • (0)
  Add to cart