Quelpr
1 markNon-Metals

CSEC Chemistry · January 2009 · Paper 2 · Question 7(a)(ii)

NPK is a common fertilizer containing nitrogen, phosphorus, and potassium, available in various strengths. Labels for three bags (A, B, C) are provided: Bag A (20:8:14), Bag B (14:14:14), Bag C (10:25:15). Scenario 1: Farmer Brown's tomatoes ripened slowly, with thin, fragile roots. Scenario 2: Farmer George's herbs (parsley, chives, thyme) appeared yellow and limp.

Provide a suitable explanation for your selection in EACH case.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 7(a)(i)Suggest which bag of fertiliser (A, B or C) the farmers should use to solve the problems encountered in Scenario 1 and Scenario 2 above.[7 marks]
  2. 7(b)(i)Write the chemical formula for lime.[1 mark]
  3. 7(b)(ii)What is the effect of lime on the acidity of a soil?[1 mark]
  4. 7(b)(iii)Write a balanced ionic equation to illustrate the action of lime on soil.[2 marks]
  5. 7(b)(iv)A cotton farmer recognizes that his soil needs more nitrogen, and lime, so he adds an ammonium fertiliser and lime to the soil at the same time. Explain how…[4 marks]

More practice: the rest of this paper · more Non-Metals questions · all CSEC Chemistry past papers