Purity and separating mixtures

EasyMediumHard
1
Question 1
Hard
a.

The Haber-Bosch process involves a reversible reaction that reaches a dynamic equilibrium: N2(g)+3H2(g)⇌2NH3(g)\text{N}_2(\text{g}) + 3\text{H}_2(\text{g}) \rightleftharpoons 2\text{NH}_3(\text{g})N2​(g)+3H2​(g)⇌2NH3​(g)

What is the relationship between the rate of the forward reaction and the rate of the backward reaction at dynamic equilibrium?

[1]
b.

What happens to the concentrations of the reactants and products once dynamic equilibrium has been reached?

[1]
c.

A common alloy used in high-temperature heating elements is Nichrome, often designated by the elemental symbols Ni-Cr. Name the two metallic elements represented by these symbols.

[2]
d.

Nickel(II) sulfate is a soluble salt. Describe how a chemist can obtain a sample of pure, dry nickel(II) sulfate crystals from an aqueous solution of nickel(II) sulfate.

[2]
e.

Silver chloride, AgCl\text{AgCl}AgCl, is an insoluble salt. A chemist attempts to prepare a pure, dry sample of silver chloride using the following method:

  • Pour 125 cm3125\text{ cm}^3125 cm3 of silver nitrate solution into a beaker.
  • Add a few drops of dilute sodium chloride solution until a white precipitate is visible.
  • Allow the precipitate to settle to the bottom of the beaker.
  • Pour off (decant) the liquid from the top.
  • Use a spatula to scrape the wet solid onto a piece of paper.

Describe and explain two modifications the chemist could make to this method to increase the yield of pure, dry silver chloride obtained.

[8]

Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /Purity and separating mixtures