Download Unit 2 Subject: Chemistry Year 10 Title: Experimental techniques

Unit 2
Title: Experimental techniques
Learning objectives:
Lesson 6
Lesson 2.1 Measurement
Core
Name appropriate apparatus for the
measurement of time, temperature, mass
and volume, including burettes, pipettes and
measuring cylinders
Subject: Chemistry
Year 10
Description of work to be covered
Class work: in this lesson students will….
Work through page 8 CFY and have a full range of chemical
apparatus for the students to look at and investigate their use.
Presentation of apparatus and their use (poster or power-point)
Suggested activities: Basic apparatus 1 & 2 (red button page 8
CFY)
Online resources
Kerboodle Chemistry For You online textbook pages (8 & red
button on top of page)
Lesson 7
2.2 (ai) Criteria of purity - Chromatography
Core
Describe paper chromatography
Interpret simple chromatograms
Class work in this lesson students will investigate….
Experimental work involving simple inks, dyes and food colourings. Nonpermanent felt tipped pens work well.
Suggested activities: Experiment 14.7 ‘Chromatography’ page
182 CFY (help sheet press red button beside exp 14.7)
Homework: Kerboodle CFY page 186 question 4
Online resources
Kerboodle Chemistry For You online textbook pages (182)
http://www.personal.psu.edu/
Lesson 8
2.2(aii) Criteria of purity - melting and boiling
points
Core:
Identify substances and assess their purity
from melting point and boiling point
information
Understand the importance of purity in
substances in everyday life, e.g. foodstuffs
and drugs
Class work in this lesson students will observe….
Demonstrations using water and dissolving sodium chloride or other
salts in it. The use of salt on roads to melt ice could be mentioned
in this context.
Lesson 9
2.2 (aiii) Criteria of purity - Chromatography
‘Rf values & locating agents’
Class work: in this lesson students will….
Use R values to compare the height of the spots on the chromatogram
Supplementary
Interpret simple chromatograms, including
Suggested activities: Experiment ‘Pure substances’ page 329
CFY (press red button beside)
Online resources
Kerboodle Chemistry For You online textbook pages (329 red
button)
Drug purity regulations – see in: http://www.cgmp.com/
f
with advanced students.
Experimental work can be extended to include separating a mixture
of amino acids (using ninhydrin as a locating agent) and simple
sugars.
the use of Rf values
Outline how chromatography techniques can
be applied to colourless substances by
exposing chromatograms to substances
called locating agents (knowledge of specific
locating agents is not required)
Link to learning programme 14, Organic Chemistry.
Suggested activities:
Kerboodle p182 extension: Chromatography
http://www.chemguide.co.uk/analysis/chromatography/paper.html
Homework
Online resources
Kerboodle Chemistry For You online textbook pages (182 red
button at bottom of page)
http://www.chemguide.co.uk/analysis/chromatography/paper.html
Lesson 10&11
2.2 (b) Methods of purification
Core
Describe methods of purification by the use
of a suitable solvent, filtration, crystallisation,
distillation (including use of fractionating
column). (Refer to the fractional distillation of
crude oil in section 14.2 and products of
fermentation in section 14.6.)
Suggest suitable purification techniques,
given information about the substances
involved
Class work in this lesson students will investigate….
Typical solvents to use are water or ethanol. Demonstrate
separation of iodine using cyclohexane.
Filtration is used in one of the salt preparation methods to remove
excess solid.
Crystallisation is used in most salt preparations to obtain the final
product.
Demonstrate the (partial) separation of ethanol from water by
distillation. Demonstrate separation of ‘petroleum fractions’ from
mixtures of hydrocarbons.
This may be linked to magnetic properties (less important) and
varying solubilities (more important).
Suggested activities: Fractional distillation of crude oil (CFY page
144 first press red button for help sheet). What are uses of crude
oil? Interactive (CFY page 144 press second red button.).
Distillation page 17f CFY – press red button. CFY - Demonstration
11.1 ‘distilling crude oil’ (see red button for worksheet distilling
crude oil in the lab)
Homework
www.samlearning.com (click on GCSE, then science, then IGCSE
science courses, then IGCSE Cambridge chemistry, then
particulate nature of matter – do the revise for mixtures, and
both fractional distillation links.
Online resources
Kerboodle Chemistry For You online textbook pages (128, 142,
144, 175)
Class work:
Lesson 12
Students to complete progress & baseline assessments and peer /
Progress assessment – experimental
self mark
techniques
Baseline assessment – atoms, elements and
compounds
Assessment arrangements:
Baseline and progress assessment lessons to compliment AFL and homework
Extended learning:
http://www.gcsescience.com/e8-chromatography.htm (information of Rf values and chromatography as a
separation technique)
http://www.gcsescience.com/q/qelcomsep.html (online quiz)