Looking for a Tutor Near You?

Post Learning Requirement »
x

Choose Country Code

x

Direction

x

Ask a Question

x

Hire a Tutor
Dubai

Note On As Level Chemistry Practical

Loading...

Published in: Chemistry
118 Views

As level Chemistry practical

Areesha A / Dubai

0 year of teaching experience

Qualification: IGCSE-AS Level-A level

Teaches: Biology, Chemistry, English, Physics, Science, Phonics, Maths, English Language

Contact this Tutor
  1. EXPERIMENT 9 Chomintry Practical 1 — DATE.„. Zinc carbonato occtlrs in a basic form, which moans that zinc hydroxide is also present. The Chomical tonnula o' basic zinc carbonato can bo writton as where Y may not bo an integer. In this oxporitnont you will hoat basic zinc carbonate to decompose it and use your results to determine tho value of y. When basic zinc carbonato is hoatod. it docomposos as shown. FA 5 is basic zinc carbonate, (a) Method Road through the method before starting any practical work. Prepare a table tor all your results from Experiments 1 and 2 in the space on page 5. Experiment 1 Weigh a crucible with its lid and record the mass. Add 2.1—2.59 of FA 5 to the crucible. Weigh the crucible and lid with FA 5 and record the mass. Place the crucible in the pipe-clay triangle on top of the tripod. Heat the crucible and contents gently for 1 minute with the lid on. Remove the lid. Heat the crucible and contents strongly, with the lid off, for approximately 4 minutes. Replace the lid and leave the crucible and residue to cool for at least 5 minutes, before re-weighing it with the lid on. Record the mass. While the crucible is cooling, you may wish to begin work on Question 3. Calculate, and record in your table. the mass of FA 5 used and the mass of residue obtained. State the observation(s) you made while you were heating FA 5. Tvxns. Syom (ii) State the observation(s) you made once the residue had cooled down. ..irÄW Experiment 2 Repeat the procedure used in Experiment 1, using 1.5—1.9g of FA 5 and using the other crucible and lid Record the three balance readings made during the experiment. Calculate and record the mass of FA 5 used and the mass of residue obtained.
  2. OSS- (b) Calculations 161 Show your working and appropriate significant figures in the final answer to each step of your (i) Calculate the relative formula mass. M„ of zinc hydroxide, 65-9 3 h M, of = . (ii) Using your answer to (i), write down an expression, in terms of y, for the relative formula mass. Mr. of basic zinc carbonate, zn=es Mr of - (iii) Using the mass of from Experiment 1 and your answer to (ii), write down an expression, in terms of y, for the number of moles of that you heated in Experiment Q • 98 0 mol moles of ZnCO, yZn(Ol-l),
  3. Chemistry Practical 1 — (iv) Using your answer to (iii) and the equation below. write an expression. in terms Of for the number of moles of zinc oxide produced in Experiment 1 —Y (1 + + + yH70(g) e. >-YÄO I Of ZnO produced = (v) Use your results from Experiment 1 to calculate the number Of moles of zinc oxide. ZnO obtained in the residue. You may assume complete decomposition has occurred. —o. 025 moles of ZnO = O • 015 (vi) Using your answers to (iv) and (v), calculate the value of y to one decimal place. (c) (i) Apart from altering the balance or the masses Of FA 5 used, State one improvement you could make to the experimental procedure to improve its accuracy. Heosk OJI the _ com _ (ii) Which experiment should be more accurate, Experiment 1 or Experiment 2? Explain your answer. moes So. [21 [Total: 141

Need a Tutor or Coaching Class?

Post an enquiry and get instant responses from qualified and experienced tutors.

Post Requirement

Related Study Notes

Upload Study Notes

If you have your own Study Notes which you think can benefit others, please upload on MyPrivateTutor. For each approved Study Note you will get 100 Credit Points and 100 Activity Score which will increase your profile visibility.

Upload Now
Home > Study Notes > Note On As Level Chemistry Practical