IB Chemistry HL S2.1 The ionic model questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Type
Multiple choiceWritten
Difficulty
EasyMediumHard

Question 1

Paper 2Hard11 marks

A controlled preparation is used to investigate the ionic composition of an iron sulfide solid. Each batch contains 12.0×10−3 mol12.0\times10^{-3}\ \mathrm{mol} of iron ions of unknown charge. Different amounts of sulfide ions, S2−\mathrm{S^{2-}} are added. Assume that the iron ions keep the same charge throughout, no redox occurs, and the only solid formed contains iron and sulfide ions.

Figure 1 shows the measured mass of dried solid for each amount of sulfide added. A preliminary report identifies the solid as iron(III) sulfide, Fe2S3\mathrm{Fe_2S_3}

0246810121416182000.20.40.60.811.2Amount of S2- added / 10-3 molMass of dried solid / g
(a)

Describe the pattern in the graph as more sulfide ions are added, and identify the ion that limits formation of the solid beyond the plateau.

[2]
(b)

Use Figure 1 to assess the preliminary report. Deduce the simplest formula and name of the solid.

[5]
(c)

Write balanced equations showing the electron transfer from a neutral iron atom and to a neutral sulfur atom for the ions in the solid identified in (b).

[2]
(d)

Explain the nature of the bonding between the ions in the solid identified in (b).

[2]

The best questions are still waiting

Unlock every question in this topic, then type, photograph or draw your answer and have it marked against the markscheme. Find out where you are dropping marks.

Unlock all questionsCompare Student and Student Plus