Quelpr
4 marksUses of Metals

CSEC Chemistry · May/June 2009 · Paper 2 · Question 6(b)(iii)

Maynard, a mason, cast a concrete floor. He suggested dampening the floor while it was hardening. From your knowledge of cement components and its use in concrete, explain why dampening is necessary and what may occur if the floor is not dampened.

Explain to Mr. Smith why it is necessary to dampen the concrete floor. Suggest to Mr. Smith what may occur if he decides NOT to dampen the floor.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 6(a)(i)Briefly explain what is meant by EACH of the following terms as they relate to pottery production. Plasticity Porosity Vitrification[3 marks]
  2. 6(a)(ii)Suggest ONE reason why EACH of the following makes clay a suitable substance for the making of pottery. Plasticity Porosity[2 marks]
  3. 6(b)(i)Name ONE component of cement.[1 mark]
  4. 6(b)(ii)Identify TWO OTHER ingredients used to make concrete.[2 marks]
  5. 6(c)Suggest if it would be appropriate to dampen clay while hardening. Give ONE reason for your answer.[3 marks]

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