CKS3: Yr8 Chemistry Unit 4 – The chemical patterns that
make my world
Lesson number: 1
Lesson Title: Reactivity of group 1 metals
Learning Outcomes
Learning Outcome 1: Describe the
differences between a metal and
non-metal
Level 5
How I did
Targets
Connector:
(Level 4)
Discuss with the person next to you
about the properties of metals and nonmetals
Learning Outcome 2:Describe and
Explain the pattern of reactivity of
group 1 metals and use this
information to make predictions
Level 6
Learning Outcome 3:
Express these reactions as
balanced symbol equations.
Level 7
05:15
TJ
Homework
• Homework task: complete the highlighting sheet
(metals in red and non-metals in blue eg)
• Due date: next lesson
BIG picture
Key Question: which group 1 metal is the
most reactive?
• What skills will you be developing this
lesson?
• HSW- by planning and carrying out an
investigation/ Interpreting data/ evaluating
an experiment
•How is this
lesson relevant
to every day
life?
• Literacy- by writing explanations using
correctly spelt keywords and good
grammar.
Where does this lesson
fit in to the rest of the
topic?
• Participation- during a practical activity
•Quick Discussion:
•What do you
already know?
• Reflection- through self and peer
assessment of each outcome
Keywords:
Create sentences using the keywords to show that you know what they mean.
Put your hand up if there is any key word from the list that you don’t understand.
• Sodium
• Potassium
• Lithium
• Group 1 metals
• Hydroxide
• Solubility
• Caesium
• Francium
• Rubidium
New Information for Learning
Outcome 1
• Visual: Demonstration
• Audio: Demonstration
Learning activities for outcome 1
What is the difference
between a metal and a nonmetal?
Create a table to outline the
differences
Properties of metals and nonmetals
Metals
Non-metals
Good conductor of electricity and heat
Poor conductor of heat and electricity
Sonorous
Brittle
Ductile
Low density
Malleable
Dull looking
Strong
Low strength
Shiny
High density
Can you think of any examples?
New Information for Task 1
• How do we find all the elements that are
metals?
This is the line
between the
metals and
non-metals
We will be looking at group 1
metals in today’s lesson, can
someone name some of
metals in that group?
Where
are
the
alkali
metals?
The elements in group 1, on the left of the periodic table, are called the alkali
metals.
lithium
Li
sodium
Na
potassium
K
rubidium
Rb
caesium
Cs
francium
Fr
These metals are all very reactive and are rarely found in nature in their
elemental form.
Learning Outcome 1: Review
Go back to your Learning Outcome grid and fill out
the ‘How I did’ and the ‘Targets’ column.
Learning Outcome
Describe the differences
between a metal and non-metal
Level 5
How I did
Met?
Partly met?
Not met?
Targets
How can I improve
on Learning
Outcome 1?
Learning Activites for Outcome 2
• Watch demonstration and complete table in your books
State (Solid/liquid/gas)
Reaction to water
(floats slowly, quickly
or rapidly;
Gas produced or not
)
Solubility
(Soluble/ insoluble)
Universal Indicator
(Purple/red)
Lithium
Sodium
Potassium
Li
Na
K
Results: Metals with Water
Metals
Property
State
Reaction to
water
Lithium
Li
solid
Sodium
Na
solid
Potassium
K
solid
•Floats skates
slowly on the
surface
•Gas evolved
• pop
•Floats skates
quickly on the
surface
•Forms molten bead
•Gas evolved
• pop
•Floats skates
Rapidly on the
surface
•Forms molten
bead
•Gas ignites
producing lilac
flame
Solubility
soluble
soluble
soluble
Universal
Indicator
Purple
(Alkaline)
Purple
(Alkaline)
Purple
(Alkaline)
Learning Information for outcome 2
Potassium and sodium are metals that react vigorously with
water even when a small amount of each metal is used.
metal
water
metal
hydroxide
hydrogen
What is the test that a metal hydroxide is produced?
What is the test that the gas produced is hydrogen?
Keywords:
Demonstrate your
Learning for Outcome 2
I am working at level ....
because ...........
Create
Analyse (L6)
Evaluate
Apply (L5)
Using the knowledge
from the practical, write a
conclusion for the
reactions. Include:
•Prediction- what would
happen with rubidium,
francium and caesium
and therefore figure out
order of reactivity of
group 1 metals
Analyse
Apply
Understand
Remember
05:15
Determine the word equations
for the 3 reactions and use this
to explain the tests for the gas
and salt formed
Understand (L4)
Describe what happened when
metals were added to water
and explain why they are
called alkali metals
Peer/ self assessment of work
Reactivity of the alkali metals
Metals and water – equations
What are the products when each metal reacts with water?
metal
water
metal
hydroxide
hydrogen
lithium
+
water
lithium
+
hydroxide
sodium
+
water
sodium
hydroxide
+ hydrogen
potassium +
water
potassium
hydroxide
+
hydrogen
hydrogen
So, how can we tell if the bubbles were contained
hydrogen gas?
“pop!”
Hydrogen is explosive, so it
will make a lighted splint go
“pop”. This is the test for
hydrogen!
How other group 1 metals react
with water
Answer the following questions in full sentences without writing
the question
1. Why are lithium, sodium and potassium stored under the
oil?
Will react with oxygen in the air
2. Which group on the periodic table are lithium, sodium and
potassium in?
Group 1
3. What does the change in colour of indicator tells you?
That the product formed is alkaline
4. How can we say that alkali metals are soft?
As they can be cut by a knife
5. How can we say that Alkali metals have low density?
Because they float
Task 2: Review
Go back to your lesson outcome grid and fill out
the ‘How I did’ and the ‘Targets’ column.
Lesson Outcomes
Task 2:
2:Describe and Explain the
pattern of reactivity of group 1
metals and use this information
to make predictions
Level 6
How I did
Met?
Partly met?
Not met?
Targets
How can I improve
on task 2?
Learning Information and Activities
for outcome 3
• When sodium reacts with water sodium
hydroxide is produced and hydrogen:
• Sodium + water  sodium hydroxide + hydrogen
• The symbol equation for this reaction is:
Na + H2O  NaOH + H2
Balance the equation
2Na + 2H2O  2NaOH + H2
New Activities for Learning
Outcome 3
Now do the same for
potassium and lithium
Products of metal reacting with water
What is the balanced symbol equation for each reaction?
potassium
2K
lithium
2Li
+
water
+
2H2O
+
water
+
2H2O
potassium
hydroxide
2KOH
lithium
hydroxide
2LiOH
sodium
+
water
sodium
hydroxide
2Na
+
2H2O
2NaOH
+
+
+
+
+
+
hydrogen
H2
hydrogen
H2
hydrogen
H2
Task 3: Review
Go back to your lesson outcome grid and fill out
the ‘How I did’ and the ‘Targets’ column.
Lesson Outcomes
Task 3: Express these reactions
as balanced symbol equations.
Level 7
How I did
Met?
Partly met?
Not met?
Targets
How can I improve
on task 3?
Q U I Z
• Why is Copper used for making water pipes
in houses but not Sodium?
Why are the lithium, sodium, potassium
stored under oil?
Look at the sketch of the
Periodic Table.
Which section of the table includes:
1.unreactive metals and non-metals
2.the most reactive metals
3.less reactive metals
2.
3.
1.
Write down the reactivity of
group 1 metals
Explain the test for hydroxides
and hydrogen