STTSS / Chemistry / S3 / Collaborative teaching
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SHATIN TSUNG TSIN SECONDARY SCHOOL (2005-2006)
Collaborative teaching
Subject:
Chemistry
Class:
S.3D
Date:
April 27, 2006
Topic:
Metal reactivity series
Duration:
80 minutes
Pre-requisites: Students are able to
1. state the products of different reactions of metals.
Instructional
After this lesson, students should be able to
Objectives:
1. compare the rate of reaction from observations;
2. arrange the reactivity of metals according to their rates of reaction.
3. write word equations for different reactions of metals.
H.O.T. skills: Comparison, prediction
Time Plan
1
Remarks
0-15 Introduction
(T) The ear ring of Ms Mak. Some say that cheap necklace
would cause allergy to the skin while pure gold or silver
would not. Do you have this experience? Why?
(S) Give explanation e.g. impure materials cause allergy and
etc.
(T) Ask about the chemical properties of metals.
(T) Ask what to do if we want to investigate the chemical
properties of metals (or a substance).
(S) Suggest experiment e.g. (1) heat in air, (2) put in water, and
(3) put in acid.
(T) Ask if they would show similar properties.
(T) Ask if there are any differences in their rates.
2 15-35 Do experiments for heating metals in air
(T) Give experiment worksheet to students.

Worksheet x42

Metals (calcium
(S) Read procedure for heating metals in air.
granule x10,
(T) Remind students about safety precautions, e.g. put on
magnesium ribbon
goggles, stand away when heating calcium, don’t look
x10, iron wool x 1
directly when heating magnesium
bottle, copper foil x8)
(S) Do experiment and write results on the blackboard.
(T) Ask questions for discussion.
Key questions:
1.
How can we make the test fair?
2.
What should we observe when comparing their rates?
3.
Not all metals (e.g sodium, potassium, zinc, aluminium and
lead) are used in this experiment. Suggest reasons.
4.
We have to clean the metals before experiment. Why?
5.
It takes about one minutes before calcium reacts with air.

Tongs x10
STTSS / Chemistry / S3 / Collaborative teaching
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Why?
6.
What is actually produced? (Hint: give the elements that are
present in the chemicals.)
3 35-65 Do experiments for putting metals into water and acid

Metals (calcium
(S) Read procedure for putting metals into water and acid.
granule x10,
(S) Remind students about safety precautions, e.g. acid may
magnesium powder
spray out when putting metals into it.
x1, aluminium
(T) Instruct students to do reactions with either (1) water or (2)
powder x1, zinc
acid.
powder x1, iron
(S) Do experiment and write results on the blackboard.
powder x1, lead
(T) Ask questions for discussion.
powder x1, copper
turning x1)
Key questions:
1.
How can we make the test fair?
2.
What should we observe when comparing the rates?
3.
Aluminium reacts only after a few minutes. Give reason.
4.
Is it possible to compare reactivity by counting when metals
start to react?
5.
What is actually produced? (Hint: give the elements that are
present in the chemicals.)
4 65-80 Discussion of results
(S) Discuss and arrange the order based on results.
(S) Explain their arrangements.
(T) Give the reactivity series for 13 metals:
K, Na, Ca, Mg, Al, Zn, Fe, Pb, Cu, Hg, Ag, Pt, Au
Key questions:
How can we arrange the order of metals under copper?

2M hydrochloric acid
x10