Quelpr
2 marksMole Concept

CSEC Chemistry · May/June 2010 · Paper 2 · Question 2(b)(i)

P and Q both have an electron configuration of 2, 8, 1. The mass numbers of P and Q are 23 and 24 respectively.

P reacts with water to produce a solution of its hydroxide and hydrogen gas. Write a balanced equation for the reaction between P and water.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)(i)Sodium, magnesium, aluminium, silicon and chlorine are found in the same group in the periodic table. (Give your answer in terms of electron configuration.)[2 marks]
  2. 2(a)(ii)Of the elements magnesium and copper, magnesium will more readily oxidize an aqueous solution of zinc ions than copper will.[4 marks]
  3. 2(b)(ii)Both P and Q give similar products when reacted with water. Account for this observation.[2 marks]
  4. 2(b)(iii)Q is radioactive. Radioactive substances are widely used in medicine, agriculture and industry. What is meant by the term 'radioactive'?[1 mark]
  5. 2(b)(iv)Give TWO uses of radioactive elements in medicine, agriculture or industry.[2 marks]
  6. 2(c)Using dot-and-cross diagrams, show the bonding between Q and oxygen. [¹⁶₈O][2 marks]

More practice: the rest of this paper · more Mole Concept questions · all CSEC Chemistry past papers