Write your centre number, candidate number and name on all the work you hand in. Give details of the practical session and laboratory where appropriate, in the boxes provided. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES.
the water just above the base of the tub. ● Use the 50 cm3 measuring cylinder to transfer 50 cm3 of FA 2 into the conical flask. ● Fit the bung tightly in the neck of the flask, clamp the flask and place the end of the delivery
Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Use of a Data Booklet is unnecessary.
Showyourworkingandappropriatesignificantfiguresinthefinalanswertoeach step of your calculations.
1 Several ores of copper contain both copper(II) carbonate and copper(II) hydroxide. This combination is called basic copper(II) carbonate. You will determine the composition of an ore of copper by reacting it with an excess of acid and collecting the gas evolved.
Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions
9701/33 February/March 2019
2 hours
READ THESE INSTRUCTIONS FIRST
Session Qualitative Analysis Notes are printed on pages 10 and 11. A copy of the Periodic Table is printed on page 12.
At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.
(a) Method
● Fill the tub with water to a depth of about 5 cm. ● Fill the 250 cm3 measuring cylinder completely with water. Hold a piece of paper towel
firmly over the top, invert the measuring cylinder and place it in the water in the tub. ● Remove the paper towel and clamp the inverted measuring cylinder so the open end is in
CuCO3(s) + H2SO4(aq) CuSO4(aq) + H2O(l) + CO2(g)
FA 1 is a sample of basic copper(II) carbonate. FA 2 is dilute sulfuric acid, H2SO4.
The formula of basic copper(II) carbonate, FA 1, can be written as xCuCO3•yCu(OH)2. You will use your results to determine the ratio x : y in the formula.
Cambridge Assessment International Education Cambridge International Advanced Subsidiary and Advanced Level
*5713737338*
CHEMISTRY Paper 3 Advanced Practical Skills9 03_9701_33/5RP © UCLES 2019
This document consists of 12 printed pages.
For Examiner’s Use 1 2 3
Total
[Turn over
2
Quantitative Analysis
Read through the whole method before starting any practical work. Where appropriate, prepare a table for your results in the space provided.