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Edexcel A-Level Chemistry AS 3 P7 Plotting and Interpreting Graphs Questions

Practise Edexcel IAL Chemistry 3.P7 by plotting practical data with correct scales, constructing best-fit lines and using graph readings to interpret trends and quantities.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Plot points accurately with labelled axes, units, sensible scales and a best-fit line.
  • draw best-fit lines, intersections and plateaux to determine graph features
  • use graph readings and extrapolation to extract practical quantities and trends

Edexcel A-Level Chemistry AS 3 P7 Plotting and Interpreting Graphs Questions question 1

[Maximum number: 4]

Precipitation reactions can be used to determine the formulae of compounds.
A bottle has a torn label which shows that it contains a nitrate with the formula X(NO_3)_2.

Figure for Question Edexcel A-Level Chemistry AS 3 P7 Plotting and Interpreting Graphs Questions question 1 — Edexcel A-Level Chemistry AS

Procedure
- a technician dissolved a sample of 12.41 g of the nitrate in deionised water to make 100 cm^3 of solution
- the technician pipetted 5.0 cm^3 of 1.50 mol dm^-3 potassium iodide into each of a series of test tubes
- each test tube then had a volume of the nitrate solution added to it as shown in the table
- a cloudy yellow solution formed, and the precipitate was allowed to settle
- the height of the precipitate was then measured.

The equation for the reaction is

X(NO3)2(aq)+2KI(aq)→XI2( s)+2KNO3(aq)\mathrm{X}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{KI}(\mathrm{aq}) \rightarrow \mathrm{XI}_{2}(\mathrm{~s})+2 \mathrm{KNO}_{3}(\mathrm{aq})

The results of the experiment are shown.

Table for Question Edexcel A-Level Chemistry AS 3 P7 Plotting and Interpreting Graphs Questions question 1 — Edexcel A-Level Chemistry AS

Question (a)

(a)

Plot the data on the grid.

Figure for Question (a) — Edexcel A-Level Chemistry AS
[ 2 ]

Question (b)

(b)

Determine the minimum volume of nitrate solution needed to react completely with 5.0 cm^3 of potassium iodide solution. You must show your working on the graph.

[ 2 ]
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