metals lo:i know how metals occur in nature. 1. occurrence
TRANSCRIPT
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Metals
LO: I know how metals occur in nature.
1. Occurrence
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Metals:
Of the 90 naturally occurring elements, are metals.
LO: I know how metals occur in nature.
70
extracted
Unreactive metals don’t form compounds in nature:e.g. and .
Gold and silver are found as elements in the soil.
compounds
Most metals need to be from compounds before they are used.
Most metals are found in nature as .
They were the first metals to be discovered.
gold silver
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2. Properties
LO: I know some properties and uses of metals.
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Metals have many properties which makes them useful for a variety of jobs.
Malleability:
Metals can be and .
Strength: is used in construction.
• Buildings
LO: I know some properties and uses of metals.
Iron
shapedrolled
• Bridges
• Car body panels
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Density:
Low density is used to make aircraft.
Electrical Conductivity:
Metals conduct electricity when and .
LO: I know some properties and uses of metals.
solid
lead
titanium
• Copper is used to make wires.
liquid
Heat Conductivity:
Metals are conductors of heat.
• Many pots are made of aluminium.
good
High density is used to make radiation shielding.
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Quiz
Of the 90 naturally occurring elements, how many are metals?
70 8060
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Quiz
Which of the following metals is found as an element in nature?
tin leadgold
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QuizThe main reason for using aluminium to make electrical wires is because:
A it is a good conductor of heat.
B it is a good conductor of electricity.
C it is very strong.
D it has a very high density.
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QuizLead is used to make boot soles for deep sea divers because:
A it is a good conductor of heat.
B it is a good conductor of electricity.
C it is very strong.
D it has a very high density.
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QuizWhich of the following is not a reason for using copper to make water pipes:
A it is a good conductor of heat.
B it is malleable.
C it is strong.
D it does not react with water.
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3. Alloys
LO: I know what is meant by an alloy.
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An alloy is a of metals.
The properties of an alloy are to the properties of the metals in the mixture.
non-metals
LO: I know what is meant by an alloy.
different
mixture
Some alloys are a mixture of metals with .
Alloy Mixture Use
brass
bronze
solder
steel
The properties change as the of the mixture are changed.
proportions
copper, zinc
copper, tin
tin, lead
iron, carbon
hinges, door handles
statues
connection pipes and wires
construction
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Quiz
Which word means a mixture of metals?
alley allayalloy
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Quiz
“Some alloys can contain non-metals”
FalseTrue
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Quiz
Which of the following is an alloy?
solder cobaltzinc
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Quiz
Which of the following is an alloy?
tungsten nitinolbismuth
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Quiz
Every type of steel alloy contains which element?
Carbon ChromiumIron
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QuizYou change the melting point of the alloy, solder, when you change:
A the temperature you heat it to.
B the proportions of the metals.
C the lumps into powder form.
D the size of the flame.
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4. Metals and Water
LO: I know which metals react with water.
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LO: I know which metals react with water.
Experiment
aluminium
magnesium
calcium sodium
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Order of reactivity:
sodium
LO: I know which metals react with water.
calcium
magnesiumaluminium
Increasing reactivity
does not react with water at all.Aluminium
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In general:
Some metals react with water to produce a metal and .
metal water metal hydroxide+
hydroxide
LO: I know which metals react with water.
For example:calciu
mwater calcium
hydroxide+
hydrogen
+hydrogen
+hydrogen
lithium water lithium hydroxide+ +hydroge
n
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5. Testing for Hydrogen
LO: I know how to collect and test hydrogen gas.
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LO: I know how to collect and test hydrogen gas.
Experiment
calcium
Hydrogen burns with a .pop!
Hydrogen gas can be produced by reacting with water.
A splint is placed at the mouth of the test tube.
calcium
burning
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Quiz
“magnesium metal reacts quickly with cold water”
FalseTrue
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Quiz
“sodium metal reacts violently with cold water”
FalseTrue
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Quiz
“when metals react with water they produce oxygen gas”
FalseTrue
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Quiz
Which of the following metals does not react with water?
calcium lithiumaluminium
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Quiz
Which of the following metals is the most reactive with cold water?
calcium lithiumsodium
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QuizWhen sodium reacts with water the products are:
A sodium oxide and hydrogen.
B sodium hydride and oxygen.
C sodium hydroxide and hydrogen.
D sodium hydride and oxygen.
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Quiz
The test for hydrogen is:
A relights a glowing splint.
B burns with a pop.
C turns lime water cloudy.
D puts out a burning splint.
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6. Metals and Acid
LO: I know which metals react with acid.
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LO: I know which metals react with acid.
Experiment
copper
iron zinc magnesium
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Order of reactivity:
magnesium
LO: I know which metals react with acid.
zinc
iron
copper
Increasing reactivity
does not react with acid at all.Copper
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In general:
Some metals react with acid to produce a metal and .
metal acid metal salt+
salt
LO: I know which metals react with acid.
For example:
iron hydrochloric acid
iron chloride+
hydrogen
+hydrogen
+hydrogen
zinc hydrochloric acid
zinc chloride+ +hydroge
n
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Quiz
“zinc metal reacts quickly with acid”
FalseTrue
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Quiz
“magnesium metal reacts quickly with acid”
FalseTrue
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Quiz
“when metals react with acid they produce hydrogen gas”
FalseTrue
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Quiz
Which of the following metals does not react with acid?
iron zinccopper
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Quiz
Which of the following metals is the most reactive with acid?
magnesium aluminiumzinc
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QuizWhen nickel reacts with hydrochloric acid the products are:
A nickel chloride and hydrogen.
B nickel chloride and oxygen.
C nickel chlorate and hydrogen.
D nickel chlorate and hydrogen.
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Quiz
The test for hydrogen is:
A relights a glowing splint.
B burns with a pop.
C turns lime water cloudy.
D puts out a burning splint.
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7. Making a Salt
LO: I know how a salt can be made from a metal and acid.
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Aim:
LO: I know how a salt can be made from a metal and acid.
To make a sample of the salt magnesium sulphate by reacting magnesium with sulphuric acid.
Making a Salt
Diagram:
sulphuric acid
filter funnel
magnesium
filter paper
heat
magnesium
sulphate solution
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Method:1. cm3 of sulphuric acid (1M) was added
to a beaker.
2. Pieces of magnesium were added to the acid until it stopped .
3. The mixture was .
Result:A white solid ( ) was produced.
Conclusion:Magnesium sulphate salt can be made by reacting magnesium sulphate with sulphuric acid, the mixture and then the water.LO: I know how to make a salt from a metal and acid.
4. The solution was heated to remove the .
25
fizzingfiltered
water
magnesium
sulphate
filteringevaporating
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8. Types of Salt
LO: I know how to name a salt from the reactants.
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The name of a salt comes from a and the it was reacted with.
zinc sulphate
LO: I know how to name a salt from the reactants.
metal
For example:
from metal
from acid
In general:
acid
hydrochloric acid metal chlorides
sulphuric acid metal sulphates
nitric acid metal nitrates
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LO: I know how to name a salt from the reactants.
For example:calciu
msulphuric
acid+ calcium
sulphate+hydroge
n
nickel nitricacid
+ nickelnitrate
+hydrogen
lead nitricacid
+ leadnitrate
+hydrogen
tin sulphuricacid
+ tinsulphate
+hydrogen
iron hydrochloric
acid
+ ironchloride
+hydrogen
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9. Collecting and Testing Oxygen
LO: I know how to collect and test a sample of oxygen.
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Aim:
LO: I know how to collect and test a sample of oxygen.
To collect a sample of oxygen and perform the test for oxygen.
Diagram:
water
oxygen
Hydrogen peroxide
+Manganese dioxide
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Method:1. A boiling tube was filled with oxygen as
shown in the .
2. A splint was placed in the tube of oxygen.
Result:The glowing splint .
Conclusion:Oxygen can be collected under .A splint in oxygen.This is the for oxygen.
LO: I know how to collect and test a sample of oxygen.
glowing
relit
waterrelightsglowing
test
diagram
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9. Metals and Oxygen
LO: I know which metals react with oxygen.
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LO: I know which metals react with oxygen.
Diagram:
Aim: To find out how metals react with oxygen.
metalceramic wool
potassiumpermanganate
heat heat
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LO: I know which metals react with oxygen.
Results:
Metal Observation
Magnesium
Zinc
Copper
Very bright white glow
Bright white glow
Dull orange glow
Conclusion:magnesium
zinc
copper
Increasing reactivity
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In general:Some metals react with oxygen to produce a metal .
metal oxygenmetal oxide+
oxide
LO: I know which metals react with oxygen.
For example:
zinc oxygen zinc oxide+
iron oxygen+ iron oxide
Metals reacting with oxygen is known as .oxidation
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10. Reactivity of Metals
LO: I know how metals differ in reactivity.
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The reactivity of metals can be shown in a list called the reactivity series.
LO: I know how metals differ in reactivity.
• potassium • sodium• lithium• calcium• magnesium• aluminium• zinc• iron• tin• lead• copper• silver• gold• platinum
Reacts with water
Reacts with acid
Reacts with oxygen
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11. Corrosion
LO:I know what is meant by corrosion of a metal.
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A metal corrodes when the surface atoms react to form a compound.
Metals corrode fastest when they are exposed to .
Different metals corrode at different rates: corrodes very quickly.
LO: I know what is meant by corrosion of a metal.
sodium
air
hardly corrodes at all.gold
An uncorroded metal is in appearance.
A corroded metal is in appearance.
shiny
dull
Corrosion is also an example of .oxidation
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12. The Cause of Corrosion
LO: I know what causes corrosion.
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oil
water
naildrying agent
LO: I know what causes corrosion.
Experiment
water only
water & oxygen
oxygen only
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The iron only rusts when and are present.
LO: I know what causes corrosion.
water oxygen
Only the corrosion of is called rusting.
The rusting of iron can be speeded up by:
• Adding salt.
iron
• Adding acid.• Heating it up.
Result:
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13. Test for Rusting
LO: I know how to test for rusting.
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LO: I know how to test for rusting.
The presence of rusting is detected using . indicator:
rust
Rust indicator changes colour from to in the presence of rust.
yellow blue
rust indicator
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14. Preventing Rusting
LO: I know some physical methods of stopping iron from rusting.
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A surface barrier can be used to stop and getting to the iron.
LO: I know physical methods of stopping iron from rusting.
wateroxygen
• Painting, for example:
- .
- .
Forth bridge
Car bodywork
• Greasing or Oiling, for example:- .
- .
Door hinges
Bicycle chain
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LO: I know physical methods of stopping iron from rusting.
• Coating with plastic, for example:
- .
- .
Fence wire
Wire baskets
• Electroplating.
- .
- .
Chrome pipesJewellery
(covering one metal with a layer of another using electricity).
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15. Electroplating
LO: I know what is meant by electroplating.
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Nickel plating on copper:
LO: I know the reactions involved in electroplating.
Electroplating is covering one metal with another using .
copper
nickel
nickel plating solution
electricity
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LO: I know the reactions involved in electroplating.
During the plating process:
nickel
• The strip gets smaller in mass.
• A layer of forms on the copper strip.
nickel
Electroplating iron with a layer of makes it look and stops and from getting to the iron below.
chromiumshiny water oxyge
n
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16. Chemical Protection of Iron
LO: I know chemical methods of stopping iron from rusting.
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LO: I know chemical methods of stopping iron from rusting.
moreIf iron is connected to a reactive metal it will not corrode.
e.g. iron and magnesium
sacrificial
The reactive metal corrodes instead of the iron.
This is called protection.
more
rust indicator
magnesium
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If iron is connected to a reactive metal it will corrode faster than normal.
LO: I know chemical methods of stopping iron from rusting.
less
e.g. iron and copper
rustsThe iron to protect the copper from corrosion.
rust indicator
copper
HOWEVER:
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16. Galvanising
LO: I know what is meant by galvanising iron.
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- Chemical protection as zinc is reactive than iron.
Galvanising is coating iron with a layer of .
LO: I know what is meant by galvanising iron.
zinc
water
more
The iron objects are dipped into molten zinc.
- Physical protection from and .
This provides double protection:
oxygen