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3 marksMole Concept

CSEC Chemistry · May/June 2014 · Paper 2 · Question 2(d)(ii)

Calcium nitrate decomposes under strong heat according to the equation: 2Ca(NO₃)₂(s) → 2CaO(s) + 4NO₂(g) + O₂(g)

If 5.0 grams of calcium nitrate are decomposed completely, calculate the volume of nitrogen dioxide produced at RTP. [One mole of a gas occupies 24 000 cm³ at RTP; RMM of Ca(NO₃)₂ = 164]

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Other parts of this question

  1. 2(a)(i)Based on the position of Element X in the Periodic Table, state whether it would react more vigorously or less vigorously with water than K would react.[1 mark]
  2. 2(a)(ii)Would the solution formed from the reaction of X with water be acidic or basic? Explain your answer.[1 mark]
  3. 2(b)(i)Write the electronic configuration for magnesium.[1 mark]
  4. 2(b)(ii)Based on the position of Element Q, write the formula for its carbonate. Formula:[1 mark]
  5. 2(b)(iii)Write a balanced chemical equation for the reaction of the carbonate of Q with dilute hydrochloric acid. Equation:[2 marks]
  6. 2(c)Sodium reacts with Element Z to form a compound. State whether this compound is ionic or covalent, and explain your answer.[3 marks]
  7. 2(d)(i)What visible change would be observed when calcium nitrate decomposes?[1 mark]

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