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Y8 Elements & Compounds - KS3 Science

Physical Changes - Chemical Reactions - Mixing Chemicals - Atoms & Elements - The Periodic Table - Metals & Non-metals - Elements, Mixtures & Compounds - Comparing Elements, Mixtures and Compounds - Conservation of Mass
by

J Amuah-Fuster

on 8 July 2016

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Transcript of Y8 Elements & Compounds - KS3 Science

Adding Lead nitrate to Potassium Iodide
Fill in the prediction on your sheet

Prediction:_______________________________________
_______________________________________________
Conservation of Mass
Elements Quiz
L3: History of the Periodic Table
Chemical Reactions
Synthetic Materials
Classify the following as physical or chemical change
Elements & Compounds
The stuff we're made of...
Identify A - D as either
element
,
compound
or
mixture
.
Justify your choice each time

Physical & Chemical Changes
L1: Atoms & Elements
L4: The Periodic
Table

Making Compounds
By the end of the lesson students should be able to:

Recognise a chemical and physical change
Describe the difference between a chemical and physical change
Apply rules about chemical and physical change to new examples
Starter
Match the keyword to its definition
Fruit Rotting

Reversible and Irreversible Reactions
Drying Your Hair

Boiling Water

Chemical reactions may be
reversible
or
irreversible
.

So what does that mean?

Reversible reactions are ones that can be changed back to how there were.

Irreversible reactions cannot be changed back to how they were. What ever change occurred is permanent
Burning Magnesium

Crumpling a Piece of Paper

Eating and Digesting Food

Sugar Dissolving in Water

Burning Wood

An Ice Lolly Melting

Physical and Chemical Change (Copy & Delete)
No
new substances are formed when a (
chemical
/
physical
) change happens.

Physical changes are (
irreversible
/
reversible
) changes.

New substances are formed when a (
chemical
/
physical
) reaction happens. You can tell a (
chemical
/
physical
) reaction has happened if something changes (
hardness
/
colour
) or if a (
gas
/
solid
) is given off. Sometimes there is a change in (
energy
/
softness
).
Baking a Cake

We will observe what happens when wax is melted and what happens when a wax candle is burned.

Record your observations on your record sheet
Teacher Demonstration
Practical circus
Move around stations investigating different chemical and physical changes.

There are instruction cards for each station and a sheet for you to work on.

Adding hot water to pot noodles
Cheese going mouldy
Chocolate melting
Chemical change or physical change?
Burning methane
Getting a flat tyre
Steam condensing on a window
Melting
Changes of State
Physical Changes
Freezing / Solidifying
When liquids cool down they can turn into solids.
Physical Changes
What is happening here?
Can you describe how this happens?
This is when solids turn into liquids
Boiling
When a liquid reaches the temperature at which it turns into a gas.
Condensing
When gases cool down they can turn into liquids.
Objectives
• Identify examples of chemical and physical changes

• Describe what happens to water particles during melting, boiling etc.

• Draw particle diagrams to represent physical changes
Changing state
As a substance
gains energy
from being heated, the particles begin to move more quickly,
they vibrate faster
.
Faster vibrations cause the
particles collide
with each other,
spacing them apart
. The higher the temperature, the more often the particles collide, thus, the further apart they move.

The
opposite
case is true when a substance is
cooled

down
.
Iron and Sulfur
Equations
What do chemical reactions look like?
New substances are formed, and the change is usually difficult to reverse
Copy this table
There may be an energy change (gets hotter or colder)
There may be a gas given off (bubbles)

There may be a change of colour
Chemical reactions – What to look for:
What are the signs of a chemical reaction?
Can you think of 5 substances that have been made by a
chemical
reaction?
1
2
3
4
5
Extension: What are the signs that a chemical reaction has taken place?
Chemical reactions
The arrow means “change into”. In a chemical reaction,
all the reactants change into the products.

It is difficult to reverse a chemical reaction and change the products back into the reactants.
In a chemical reaction, one or more new substances are formed.
The starting substances used in a reaction are reactants.
The new substances formed in a reaction are products.
Reactants and products
Chemical reactions
To discover how to spot a chemical reaction

To write simple equations for chemical reactions
Carbon dioxide
oxygen
carbon
What is the word equation for

carbon
reacting
with

oxygen

to
form
carbon dioxide
?
Word equations
2. An arrow.

1. The names of the reactants.

There are always
three
parts to a word equation:
A word equation is used as a quick, shorthand way of writing a chemical reaction.
3. The names of the products.

Chemical reactions do not only happen in the laboratory.

Chemical reactions happen
anywhere
that
new substances
are made:
Living!
Making metals
Burning
Sticking
Rusting
Cooking
copper oxide
magnesium
copper
magnesium oxide
magnesium
1. Magnesium burns brightly in oxygen to form magnesium oxide.
water
hydrochloric acid
calcium hydroxide
calcium chloride
oxygen
magnesium oxide
Write the word equations
3. Magnesium reacts with copper oxide violently to make magnesium oxide and copper.
2. Calcium hydroxide reacts with hydrochloric acid to form calcium chloride and water.
What are the word equations for our reactions?
hydrogen
hydrochloric acid
sodium
sodium chloride
hydrogen
4. Hydrogen reacts with bromine to form hydrogen bromide.
chlorine
aluminium
aluminium chloride
bromine
6. Sodium reacts with hydrochloric acid to form sodium chloride and hydrogen.
5. Aluminium reacts with chlorine to produce aluminium chloride.
Chemical reactions – What to look for:
Chemical reactions – What to look for:
Chemical reactions – What to look for:
Write the word equations
What are the word equations for our reactions?
hydrogen bromide
Word
Mixing chemicals is always a chemical change

True or False?
This is the word equation for carbon reacting with oxygen.




True or False?
Mixing chemicals - Practical
Is this a physical or chemical change?
Is this a physical or chemical change?
Is this a physical or chemical change?
Results
Fill a tube about one-third full with the first chemical
Add the same amount of the other chemical and fill out the table
Card sort:

Match the words to their definitions
Human Element worksheet
What is an element?
An element is a pure substance.

It contains only one type of atom.

All elements are found in the periodic table
There are millions of different substances!
What are they all made of?
Starter
How many
different substances
can you think of?
There are over one hundred different types of atom. These are the
elements
.
All substances are made of very tiny particles called
atoms
.
What is an element?
Many substances are made up of
different types
of atoms.
CAR -
iron, aluminium, silicon, oxygen and boron atoms

FLOWER -
carbon, nitrogen, hydrogen, oxygen and sulphur atoms
PLASTIC -
carbon and hydrogen atoms
WATER -
hydrogen and oxygen atoms
All substances are made of very tiny particles called
atoms
.
Copper
is an element:
made up of
copper atoms only
.
An element is a substance made up of only
one type of atom
.
In the back of your book, state whether each box is:
A - an element
B - a compound
C - a mixture

Extension:
If it is a mixture, is it a mixture of;
elements, compounds, or both?
PT Timeline
H O
L2: Elements, Compounds & Mixtures
Quiz
Chemicals
Safety Specs
Test tube rack
Equipment
6 test tubes
Method
Carbon + Oxygen  Carbon Dioxide
Atoms & Elements
Which Element?
extension
Calculating masses
GOLD
COPPER
IRON
ALUMINIUM
CARBON
HELIUM
Organising elements into the periodic table
Carbon
is an element:
made up of
copper atoms only
.
Helium
is an element:
made up of
helium atoms only
.
OXYGEN

Make a poster for my lab on your favourite element

Include:
- Name and symbol
- Fascinating facts
- Lots of pictures!

There will be prizes for the most imaginative!
What do we know about elements in the same GROUP??
In groups complete the periodic table quiz

If you finish make up 5 questions of your own!
Make your own element cube
You will be given the name of an element.
Find out for your element:

1) The symbol.
2) The atomic number.
3) Whether it is a metal or a non-metal.
4) Whether it is a solid, liquid or gas at 20oC.
5) What it looks like.
6) One other interesting fact you have found.

Write the information onto the six faces of your cube template. Build your cube.
Use the top trump cards to put the elements into groups

- Are there different ways of grouping the elements?
Periodic table - Starter
"Periodic table of Elements"
How many words can you make from the letters in:
Homework
QUIZ!!!
What is a metal?
L5: Metals
& Non-metals

Metal or non-metal?
Silver
Iron
Gold
Carbon
Sulfur
Chlorine
Copper
Put these elements into 2 groups
The periodic table can be divided into metals and non-metals
Write down as many words as you can think of to do with metals
Metals
Investigating metals and non-metals (observations)
Brass
Diamond
Graphite
Iron
Mercury
Titanium
Calcium
Silicon
Metal Properties
For each picture,
EXPLAIN
which
PHYSICAL PROPERTY
of metals is being shown.
Using metals activity
Using these words write a description of a metal of your choice.
strong
conduct heat & electricity
lustre (shine)
malleable (bendable)
ductile (can be drawn into wires)
high melting point
Using metals Higher activity
Iron Sulphide is a compound of iron FeS

Colour: white (black when impure)

Appearance: crystalline solid

Non-magnetic
Iron Sulphide
Iron + sulfur  ??
Making a compound...
How can iron and sulfur be separated?
Look at the samples of iron and sulfur and write down 2 properties of each.
To understand how particle diagrams are used to represent chemical reactions.

To make a compound and compare its properties to the elements that were used to make it (reactants).
Carbon, gold and ______ are all elements. A chemical element is a ____ substance which ______ be broken down into simpler substances.

Chemical elements are made up of only ___ kind of ____.

Each chemical element has ________ properties, such as it’s physical form, density, and ______.

Elements, compounds and mixtures
Standard state: solid at 298 K

Colour: lustrous, metallic, greyish tinge

Availability: iron is available in many forms including foil, filings, sheet, wire, granules, powder, and rods.

Magnetic
Iron
Standard state: solid at 298 K

Colour: lemon yellow

Sulphur is found in meteorites, volcanoes, hot springs.

Non-magnetic
Sulphur
Fe
Sulfur
Iron sulfide
Iron and sulfur
Copy and complete the particle diagrams.
Label them with element, mixture and compound.
Give 2 ways the iron sulphide is different from the iron and sulfur mix.
Write a word equation for the reaction between iron and sulfur.
Iron
Elements, compounds and mixtures
Learning objectives
S
S
Fe
Sodium
(Neil Armstrong - Na)
Question 20

Calcium
(Christina Aguilera - Ca)
Question 18
Arsenic
(Alan Sugar - As)
Question 17

Scandium
(Simon Cowell - Sc)
Question 16

Magnesium
(Mag + knees + ee + um)
Question 15
Fluorine
(floor + een)
Question 14

Neon
(knee + on)
Question 12
Carbon
(car + bun)
Question 11
The GOLDen compass
What movie starred Nicole Kidman and Daniel Craig and also featured the voice of Ian McKellen as a talking polar bear?
Question 9
Platinum
What term is used to describe an album or a single that has sold over 1 million copies?
Question 8

IRON man 2
What 2010 movie stars Robert Downy Jr. as a comic book hero?
Question 6
Lead
‘Plumbum’ is the Latin name for which element?
Question 4
Zirconium
Which element comes last alphabetically?
Question 2

Actinium
Which element comes first alphabetically?
Question 1

Now for the Answers

Well done!!!
The end
Question 20

Question 19

Question 18

Question 16

Who am I?
Round 4
Question 15

Question 14

Question 13

Question 12

Cop + Purr = Copper

Look at the pictures and sound them out. The answer will be an element.
Eg.

Example

Say what you see
Round 3
What movie starred Nicole Kidman and Daniel Craig and also featured the voice of Ian McKellen as a talking polar bear?

Question 9

What is the name of the theatre on Argyl Street in London, that started showing ‘The Wizard of Oz’ in March 2011?

Question 7

What 2010 movie stars Robert Downey Jr. as a comic book hero?

Question 6

General Knowledge?
Round 2
Which element is the only metal to be liquid at room temperature?

Question 5

‘Plumbum’ is the Latin name for which element?
Question 4
Which element comes
last
alphabetically?
Question 2
Which element comes
first
alphabetically?
Question 1

Do you know your elements?
Round 1
Hydrogen is the first element in the periodic table.
It is the lightest of all the elements. English scientist Henry Cavendish is credited with its discovery.

In what year did Cavendish discover hydrogen?
(closest answer wins)
Tie Break
Rubidium
(Russell Brand - Rb)
Question 19
Tungsten
(tongues + ten)
Question 13

Krypton
What is the name of the planet that Superman comes from?

Question 10

The PALLADIUM
What is the name of the theatre on Argyl Street in London, that started showing ‘The Wizard of Oz’ in March 2011?
Question 7
Mercury
Which element is the only metal to be liquid at room temperature?
Question 5
Nitrogen
Which element makes up most of Earth’s atmosphere?
Question 3
Question 17

Aluminium

Initials: Al

Aaron Lennon

Identify the person in the picture. Their initials will be the symbol for an element in the periodic table. The answer is the element.

Example

Question 11

What is the name of the planet that Superman comes from?

Question 10

What term is used to describe an album or a single that has sold over 1 million copies?

Question 8

Which element makes up most of Earth’s atmosphere?
Question 3

Use your periodic table to find each answer
Elements Quiz
The rise of the SILVER surfer.

All answers will either be or will contain the name of an element.
Eg. What was the name of the second movie to feature comic book heroes ‘the fantastic four’?

Example

Answers
Magnesium + Oxygen  ?
Word equation
With the person next to you list as many compounds as you can think of.
Hydrogen Oxide
(chemical name for water)
Cut up the cards and work as a team to create picture equations for each reaction.
Thinking exercise.

Work through exercise 1 and 2 with the person next to you.

Write in your book!
Hydrogen
Oxygen
Challenge 2
Challenge 3
How many elements are there in the periodic table?
Closest answer wins!
Swap your answer sheet with a nearby pair
Question 10

True or False?

There are more compounds than there are elements.

Question 9

How would you separate a mixture of salt and sand?

Question 8

Air is a mixture of gases. Name three of the gases found in air

Question 7

Draw a diagram of a compound

Question 6

Give three examples of metal elements?

Question 5

What is this a definition of?

“Contains elements or compounds or both that are NOT bonded together so they can be easily separated.”
Question 4

During a reaction a chemical change sometimes takes place.

Give two ways that we can tell this has happened?
Question 3


Is Iron Sulphide an element, mixture or compound?

Question 2

What compound is formed when Hydrogen reacts with Oxygen?

Bonus point if you can write the chemical formula!

Question 1

Which of these is an element?

Oxygen
Air
Copper sulphate
Magnesium Oxide
Oxygen
2
Water
Compound
Colour change, new substance, temperature change
Mixture
Lithium, Sodium, Potassium, Rubidium, Beryllium, Iron, Magnesium, Calcium, Aluminium, Tin, Lead, Gold, Silver, Zinc, Mercury, Copper, Titanium
True
Dissolve salt in water. Sand will not dissolve
Filter the liquid to remove sand
Evaporate the water from salt solution
Nitrogen, Oxygen, Carbon Dioxide, Argon
Tie-break question
118
How did you do?
Who has won?
1766
Magnesium Oxide
Magnesium + Oxygen
Picture equation:
Mg
Mg
Mg
Mg
O
O
O
O
+
+
Challenge 1
http://www.bbc.co.uk/learningzone/clips/conservation-of-mass-in-chemical-reactions/10619.html
What about when we burn Magnesium in Oxygen?
Why does the mass stay the same?
To finish:
Complete the rest of the sheet
Adding magnesium to acid
Will there be a
change of mass
when a chemical reaction takes place?
What is the difference between a
chemical change
and a
physical change
?

Explain using 2 or 3 sentences.
=
2(
40
)
2(
24
)
+ 32
Molecular Masses Mg = 24g ; O2 = 32g ; MgO = 40g
2MgO
2Mg + O
Magnesium + Oxygen Magnesium Oxide


Draw an atom diagram to show what happens in this reaction.
Magnesium + Oxygen  Magnesium oxide
Potassium Nitrate + Lead Iodide
Potassium Iodide + Lead Nitrate
Mass has been conserved !
MASS BEFORE REACTION = MASS AFTER REACTION
663 663
2(166) + (331) 2(101) + (461)
Mass Calculation
2(KNO3) + PbI2
2(KI) + Pb(NO3)2
Potassium Nitrate + Lead Iodide
Potassium Iodide + Lead Nitrate
Nitrate
Lead
Iodide
Draw an atom diagram to help your explanation

Potassium iodide + Lead nitrate  Lead iodide + Potassium nitrate
Potassium
+
Lead

Lead
+
Potassium


iodide
nitrate
iodide
nitrate
Potassium
+
+
Oxide
+
Magnesium
Oxygen
Oxygen
Magnesium
Magnesium
Magnesium
Oxide
+
= 80g
Group
numbers increase from
left to right
Period
numbers increase from
top to bottom.
Groups and Periods
Periodicity is a
pattern that repeats
from
period to period
(row to row).

Elements found in the same group (column), mean they have
similar chemical properties
(they react in the same way)

Period
=
row
of the periodic table
Group
=
column
in the periodic table

The periodic table is
now ordered by atomic (proton) number
.
Periodicity
Dobereiner organised the elements using ‘Triads’; groups of 3 elements with similar chemical properties.

Newlands’ Law of Octaves’ stated that if arranged inn order of relative atomic mass, every 8th element showed similar chemical properties.

Mendeleev ordered the elements by relative atomic mass as well, but he also left gaps for elements that hadn’t been discovered.

Answers
What method did Dobereiner use to organise the elements?

Why did John Newlands call his organisation method the ‘Law of Octaves’?

Explain how Mendeleev reorganised the periodic table?
Questions
To recall how the elements are ordered in the periodic table

Justify how the modern periodic table developed from Newlands’ to Mendeleev’s version

Use the key terms (properties, group, period)
Write down the symbols for any 9 elements in group 1, 2, 7 or 0(8) in a 3 x 3 grid
Bingo!
On your periodic table:

Label the groups:
the alkali metals (Group 1),
the alkaline earth metals (Group 2),
the transition metals (between Groups 2 and 3),
the halogens (Group 7),
the noble gases (Group 0)
Periodic table
50 years later John Newlands arranged them in order of relative atomic mass.
He found that every 8th element showed similar patterns. He called this the ‘Law of Octaves’.
John Newlands
In early days scientists could not measure the actual mass of atoms but they could compare masses of atoms

1800’s Dobereiner noticed there were several groups where three elements had similar properties

Watch the video about Dobereiner.
Why relative atomic mass?
Write a brief account of your findings to show which of the arrangements brings the chemical families together most clearly.
Look at the figures for density on the cards
Arrange the cards in order of increasing density, with the lowest (hydrogen) first.
Look along the cards in order.
When you come to an element that has the same family symbol as one that has gone before it, take that card and place it in a column directly below the first one.
Now take the rest of the row and bring all the cards down to the new level.
Repeat step 2, keeping the cards in increasing order of density until you have placed all 20 cards in as many family groupings underneath each other as possible.
Make a note of your arrangement using the chemical and family symbols only.
Chemical family cards
How did chemist’s put the elements in order?
How is the modern periodic table arranged?
Ordering the elements in this way produces repeating patterns in the properties of elements. This is called Periodicity
The modern periodic table is ordered using proton (atomic) number.
Modern Periodic table
What category did you use to put each sequence into that order?
Put these sequences in order (any order of your choosing!)
B, A, D, E, F, C
6, 2, 4, 1, 5, 7, 3
May, October, December, June
Pig, cat, ant, elephant, mouse
Carbon, Hydrogen, Neon, Chlorine
Te

and

I

are
not in order
in terms of their
atomic mass
Just 4 years later, Mendeleev tackled the periodic table because he wasn’t happy working with current textbooks.
He decided to line up the elements in order of their relative atomic mass.
But he realised not all elements had been discovered and so he left gaps.
This allowed him to predict the properties of the missing elements.
He spotted that at intervals along the line there were elements with similar chemical properties.

Look at I and Te on the Periodic Table…
Dmitri Mendeleev
STARTER
1817
1865
1869
Present
In 1789, Antoine Lavoisier published a list of 33 chemical elements, grouping them into gases, metals, nonmetals, and earths.
Antoine Lavoisier
1789
Li
N
F
C
Identifying literacy skills…
Structure an answer
Level 3 – organised structure, relevant information
Level 2 – organised structure, mostly relevant
Level 1 – poor structure, largely irrelevant structure

Spelling, punctuation and grammar
Level 3 – few if any mistakes
Level 2 – occasional mistakes
Level 1 – so many mistakes it makes the answer difficult to understand
Identifying literacy skills…
Interpret command words

Use of specialist terms

Structure an answer

Spelling, punctuation & grammar
How does a nylon rope help to meet this climber’s need for safety?
A lavatory in a bathroom. The bowl and cistern are ceramic.
Why is this suitable?
A boat with polyester sails and a reinforced plastic hull. Why sail in a boat like this?
A new leg made of polypropylene.
What property makes it useful for this purpose?
Properties of materials
Understand, giving examples, what is meant by a ‘synthetic’ material.
Describe properties of ceramics and polymers (plastics)
Link the properties of Synthetic and Natural Polymers with their uses.
Self mark
Identifying literacy skills…
Interpret command words
essential in order to answer the question fully and correctly!


Use of specialist terms
Level 3 – many used appropriately
Level 2 – most used appropriately
Level 1 – few is any used appropriately
Why use polycarbonate to make this roof over the Manchester City stadium?
Set the apparatus up as above.
You will be using four different material strips (steel, perspex, wood, and PVC) and be testing their flexibility.
Each strip is secured to a table using a G-clamp so that the end of the strip overhung the edge of the table by 15cm.
Add a 50g mass to the end of the strip and measure the distance moved by the pointer.
Repeat step 4 until 500g has been added, recording the distance each time.
Replace the material strip with another material after each test
Repeat the experiment up to three times (time depending).
INSTRUCTIONS
E.g. for leather shoes, leather needs to be
flexible
and
hard-wearing
Take two minutes to write as many properties as possible for the materials on the next slide.
Brainstorm
Synthetic:
Human-made substance that does not occur naturally. It must be produced
artificially
from other raw materials.
Alternative ‘material properties’ song
Try the question
In pairs discuss which you think is the best plastic
What must you write about in your question?
What are the command words?
A polythene bag.
Why do we wrap our food?
How does polythene help us do this?
Set-up
G-clamp
Materials to test (steel, wood, perspex, PVC)
Weight holder & weights
Pointer
Metre ruler
Retort stand and clamp arm
Equipment
Testing for flexibility
Natural vs Synthetic textiles
Dental Aligners
Weights
Hammer
Space Shuttle
Try these…
Glass
Ceramic
Acrylic
Wood
Natural or Synthetic?
GROUPS
- a column of elements with similar chemical properties
PERIODS - a row of elements with different chemical properties
Elements are arranged in the periodic table in order of
atomic number
Extension: 6 mark question
What are the Physical properties of a metal?
Non-metal
Non-metal
Metal
Non-metal
Metal
Metal
Metal
Metal
BRIDGE
BARBED WIRE
ELECTRIC WIRE
FORK
SAUCEPAN
MEDAL
WHAT IS A SYNTHETIC MATERIAL?
Learning Outcomes
Screws
which.., suggest.., describe.., explain..

KEYWORDS; strong, flexible, hard

Point, Evidence, Explain, Link (PEEL)

Check sentence structure and spelling of keywords
Particle diagrams
What are textiles? Where do they come from?
Can you give examples of naturally-based textiles?
L6: Properties of Materials
Carbon Dioxide
Magnesium Oxide and Copper
Aluminium Iodide
Hydrogen Bromide
sparks, orange glow
purple vapour erupts
flame, 'whoop' sound
explosion, sparks, banging noise
Carbon and oxygen
Hydrogen and bromine
Aluminium and iodine
Magneium oxide & Copper
Elements are made from
one kind of atom
A compound is a
new substance formed when two or more elements join in fixed proportions
. This involves a chemical reaction.

The properties of a compound can be different from the initial elements.

Compounds
cannot be separated by physical means into their elements
.
Compounds
Sea water is a mixture as it contains particles of water, salts and gases.

These particles are mixed together, but they are not joined.

How can we separate the substances in salt water?
Sea water is a mixture
A mixture is a combination of two or more substances.
The substances are

not chemically joined

and

can be easily separated.
Mixtures
Elements
atom, cannot, colour, distinct, one, oxygen, pure
, , , , , ,
atom
cannot
colour
distinct
one
pure
oxygen
Extension
Remember to give
examples
of each and perhaps how the
properties
compare with elements.
Produce a similar short paragraph (2-3 sentences) to describe what we mean by:
a compound
a mixture
Oxide
compounds contain
oxygen
atoms.
Chloride
compounds contain
chlorine
atoms.
Sulphide
compounds contain
sulphur
atoms.
Nitrate
compounds contain
nitrogen
and
oxygen
.
Sulphate
compounds contain
sulphur
and
oxygen
.
Vocabulary
Are these elements or compounds?
Starter
Copper sulphide
Magnesium
Salt
Sulphur
Water
Copper
Oxygen
Helium
Starter
Learning Outcomes
State that during a chemical reaction there is no overall change in mass
Explain why overall mass does not change during a reaction
Draw particle diagrams to represent chemical reactions
In a chemical reaction,
mass is never lost or gained

it is

conserved
Conservation of Mass
The total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.

We can work out the mass of one substance in a reaction if the masses of the other substances are known. 

Conservation of Mass
100g of reactants
100g of products
50 g + 50 g
Conservation of Mass
Iron + Sulphur
Iron Sulphide
???
How much calcium oxide would be produced?
If I was to do this reaction on the scales do you think we would see the mass remain the same??
What would happen to the values on the scales?
SAME
How can we find out if mass was conserved in this reaction?
What mass of MgO would be made from 48g of Mg?
2
If I was to do this reaction on the scales do you think we would see the mass remain the same??
What would happen to the values on the scales?
Nitrate
Lead
Iodide
Potassium
BEFORE
AFTER
The salt particles have
mixed
with the water, so the
mass of salt has been
added
to the mass of the water
Try to calculate the
unknown
amount...
calcium oxide + water calcium hydroxide

56g 18g ?
potassium chlorate potassium chloride + oxygen
? 150g 96g
zinc + copper sulphate zinc sulphate + copper
65g 158g 160g ?
74g
246g
63g
Show your working!
28g
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