Transcript Slide 1

CKS3: Yr8 Chemistry Unit 3 – What’s my world made of? Part 2
Lesson number: 4.
Lesson Title: Compounds and mixtures
Learning Outcomes
How I did
Learning Outcome 1:
Describe the difference between
elements and compounds.
Level 5
Connector:
Targets
(Level 4)
How do you know when a chemical
reaction is happening?
Learning Outcome 2:
To be able to distinguish between
elements, compounds and mixtures.
Level 6
Learning Outcome 3:
Explain how and why compounds can
be different from the elements they
are made from.
Level 7
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Cro2011
How do you know when a chemical reaction is taking
place?
colour changes
gives out a gas
cools down
flashes
produces a solid
glows
heats up
produces smoke
BIG picture
Key Question:
• What skills will you be developing this lesson?
• Scientific Investigation- by Research and collecting
secondary data, planning and collecting primary
data, Analysis and Evaluation.
• Numeracy- by using formulae in calculations
• Literacy- by writing well structured sentences and
paragraphs
• ICT- by using Laptops and electronic resources
• Personal skills- team work, leadership
• Thinking and Learning- organisation, logic,
participation, memory, exploration, creativity,
judgement, planning, practice.
• Reflection- through self or peer assessment of each
Learning Outcome
•How is this lesson
relevant to every
day life?
•Quick
Discussion:
•What do you
already know?
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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.
• atom
• element
• compound
• mixture
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Elements
If a solid, liquid or gas is made up of only one type of
atom we say it is an element. For example, consider a
tripod made up of iron:
These atoms are
ALL iron – there’s
nothing else in here
Compounds
Compounds are
different to
elements. They
contain different
atoms. Here are
some examples:
Glucose
Methane
Sodium
chloride (salt)
Some simple compounds…
Methane, CH4
Water, H2O
Carbon
dioxide, CO2
Key
Hydrogen
Ethyne, C2H2
Oxygen
Sulphuric
acid, H2SO4
Carbon
Sulphur
A compound is made when atoms of different elements
react and join together.
For example, water is produced from the chemical reaction
between hydrogen and oxygen.
hydrogen
+
oxygen
water
H H
+ O
O
H H
Two hydrogen molecules react with one oxygen molecule
to produce two molecules of water.
Why does water have different properties to its elements?
Task 1
Draw a vertical line down the centre of a page in your book.
Label one side element and the other compound.
Write or draw the following under the correct heading:
contain only one type of atom
sodium chloride is an example
there are just over 100 different types
can be broken down into their separate elements
cannot be broken down into anything smaller
contain more than one type of atom that are chemically joined
there are millions of different types
hydrogen gas is an example
Task 1: Answers
Check your answers.
Elements
contain only one type of atom
cannot be broken down into anything smaller
there are just over 100 different types
hydrogen gas is an example
Compounds
contain more than one type of atom that are
chemically joined
can be broken down into their separate elements
there are millions of different types
sodium chloride is an example
Task 1: Answers
compound
element
compound
element
Extended Learning
Extended Learning task:
Homework sheet 8Fc(4/5/6) Elements, mixtures and
compounds
Due date:
Criteria for Level 5:
– Basic description, basic detail.
Criteria for Level 6:
– Description with explanation and good level of detail.
Criteria for Level 7:
– Detailed description and in depth detailed explanation
using examples to highlight points made.
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Describe the difference
between elements and
compounds.
Demonstrate your Learning
for Outcome 1
Create
Evaluate
Apply (L5)
I can use Models to show
the difference between
elements and compounds
Understand (L4)
I can know the difference
between elements and
compounds
Analyse
Apply
Understand
Remember
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I am working at level ....
because ...........
To get to the next level I
need to ...........
Learning Outcome 1: Review
Describe the difference between elements and
compounds.
Go back to your Learning Outcome grid and fill out the
‘How I did’ and the ‘Targets’ column.
Learning Outcome
Learning Outcome 1:
Level 5
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How I did
Met?
Partly met?
Not met?
Targets
How can I improve
on Learning
Outcome 1?
New Information for Learning Outcome 2
Elements, compounds andthermometer
mixtures.
What is a mixture?
beaker of water
heat proof mat
Mixtures
A mixture contains two or more
substances that are not chemically joined.
A mixture is easy to separate.
sand
water
Experiment 1. Investigating iron and sulphur
You have three test tubes – 1. sulphur; 2. iron filings; 3. iron & sulphur
Carry out the following tests, and record your results:
Appearance
Effect of
moving a bar
magnet outside
the tube.
Addition of ½ a
test tube of
water
1. Iron
2. Sulphur
3. Iron & Sulphur
You’ll need this row
for after Exp 2.
Does test tube 3 contain an element. a compound or a mixture?
Explain your answer.
Experiment 2. Investigating the action of heat
on iron and sulphur
1. Put two spatulas of the iron and sulphur mixture into an
ignition tube.
2. Put a small piece of mineral wool in the end of the tube.
This will help to stop fumes escaping.
3. Heat the tube in a Bunsen flame until you see a red glow
inside the tube.
WEAR SAFETY GLASSES – ASTHMATICS BEWARE
4. Take the tube out of the flame, and when the reaction has
finished, leave the tube on a heatproof mat to cool.
5. Wrap the tube in a cloth or rag. Break the glass with a
pestle or hammer.
6. Use tongs to pick out the pieces of the product. Carefully
place the broken glass in the broken glass bin.
7. Complete the final row in your table by repeating the tests
on the product.
Is the product an element. a compound or a mixture?
Explain your answer.
Demonstrate your Learning
for Outcome 2
To be able to
distinguish between
elements, compounds
and mixtures.
I am working at level ....
because ...........
Create
Evaluate
Apply (L5)
I can identify elements,
compounds and
mixtures.
Analyse
To get to the next level I
need to ...........
Analyse (L6)
I can Distinguish between
elements, compounds and
mixtures.
Apply
Understand
Remember
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Understand (L4)
I can Explain what elements,
compounds and mixtures are.
Learning Outcome 2: Review
To be able to distinguish between elements,
compounds and mixtures..
Go back to your Learning Outcome grid and fill out the
‘How I did’ and the ‘Targets’ column.
Learning Outcome
Learning Outcome 2:
Level 6
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How I did
Met?
Partly met?
Not met?
Targets
How can I improve
on Learning
Outcome 2?
Learning Activities for Outcome 3
Comparing the properties of elements and compounds
1. The reaction between iron and sulphur
1. Compare the particles of the elements, the mixture and
the compound.
2. Why does iron sulphide have different properties to the
elements it is made of?
A compound has different properties to the
elements from which it is made because the
atoms are joined differently.
Comparing the properties of elements and compounds
2. The reaction between sodium and chlorine
Why is it safe to put sodium chloride on fish and chips…
…but not safe to use sodium and chlorine?
Sodium is a very reactive metal and chlorine is a poisonous gas.
Sodium chloride is a compound
and has different properties to the
elements from which it is made
because the atoms are joined
differently.
Demonstrate your Learning
for Outcome 3
Create
Explain how and why
compounds can be
different from the elements
they are made from.
Evaluate (L7)
I can Justify why
compounds behave
differently to the
compounds that they are
made from.
Apply (L5)
I can Model compounds
and elements.
Evaluate
Analyse (L6)
Analyse
Apply
Understand
Remember
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I can Compare the properties
of compounds and the
elements that they are made
from.
Learning Outcome 3: Review
Go back to your Learning Outcome grid and fill out the
‘How I did’ and the ‘Targets’ column.
Explain how and why compounds can be different
from the elements they are made from.
Learning Outcomes
Learning Outcome 3:
Level 7
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How I did
Met?
Partly met?
Not met?
Targets
How can I improve
on Learning
Outcome 3?
Review for Remembering
• Stand up if you have met the lesson outcomes?
• If not what do you need to do next in order to meet
the outcome? Record this in your diary as part of
your homework.
• Is there any part of the lesson you think you need to
go over again next lesson?
• Tell the person next to you three things you have
learnt this lesson.
• How will you remember this for your exam?
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Technician’s list
Apparatus
•
•
•
•
•
•
•
Test tubes
Test tube rack
One small test tube (ignition tube)
Ignition tube holder
Bunsen burner
Mineral wool
Cloth or rag
•
•
•
•
•
•
•
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A magnet
Eye protection
Iron
Sulphur
A mixture of iron and sulphur
Heatproof mat
Tongs
Small hammer
Keywords:
Demonstrate your Learning
for Outcome 2
I am working at level ....
because ...........
Create (L8)
Evaluate (L7)
Judge Justify Defend
Decide Agree Value Prove
Check Criticise
Recommend Support Test
Create
Evaluate
Combine construct Develop
Imagine Design Change
Improve Discuss Create Invent
To
get toPut
thetogether
next level
Suppose
MakeI up
Synthesise
need
to ...........
Analyse (L6)
Apply (L5)
Use Build Execute
Develop Construct
Identify Plan Select Solve
Organise Apply Model
Analyse
Apply
Remember (L3)
Understand
Who What When Where
Why Which How Match
Define List Choose Name
Spell Tell Describe
Remember
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Take apart Compare Classify
Examine List Distinguish
Simplify Theme Conclude
Motive Discover
Understand (L4)
Explain what when where how
Rephrase Demonstrate
Summarise Contrast Show
Predict Compare Clarify
Illustrate Categorise