Alloys All Most Some • Can you name some examples of common alloys? • Can you define the term ‘alloy’? • Can you suggest why iron, copper, gold and aluminium are usually made into alloys? STARTER QUESTIONS - Full sentences Which other element is mixed with iron to make steel? Why do they mix this element with iron to make steel?
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Alloys All Most Some Can you name some examples of common alloys? Can you define the term ‘alloy’? Can you suggest why iron, copper, gold and aluminium.
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Alloys
All
Most
Some
• Can you name some examples of common alloys?
• Can you define the term ‘alloy’?
• Can you suggest why iron, copper, gold and aluminium are usually made into alloys?
STARTER QUESTIONS - Full sentencesWhich other element is mixed with iron to make steel?Why do they mix this element with iron to make steel?
Starter Questions
1. Which other element is mixed with iron to make steel?
Carbon is mixed with iron to make steel.2. Why do they mix this element
with iron to make steel?They mix carbon with iron to made it stronger. This happens because the particles cannot move over one another as easily.
Home LearningThe sentences below are statements about the effect of recycling metals.Use words from the box to complete the sentences.
Recycling ____________ the amount of energy needed.
Recycling means less mining that _______________ the environment.
Recycling metals uses less energy than extracting them from _________ .
Recycling of aluminium cans eliminates ____________, saves ___________,
conserves natural resources, reduces the use of landfill sites and provides
_____________ for charities and _____________ government.
A number of factors affect the amount of waste that is _____________ .
Household size and the average _________ of residents have significant effects on
recycling.
age damages energy local money
ores
recycled reduces waste
Alloys of Gold
• Pure gold is too soft and too expensive for most people.
• This is why most gold is bought as an alloy.
Alloys of Gold
• Gold alloys are a mixture of gold particles and other metals, such as copper.
• The purity (how many gold atoms is in the alloy) is measured in carats.
• The higher the carat, the higher the purity.
Match the gold carats to the property of the gold
Coins
• Copper is too soft to use as a pure metal so it is alloyed with other elements to make it stronger.
• Most British coins are made from copper that has been alloyed with other metals.
Coins
• Copper coins are actually an alloy of three metals. 97% copper, 2.5% zinc and 0.5% tin; therefore copper coins should really be called bronze!
Coins
• Silver coins are not made from the element silver. They are an alloy of copper (75%) and nickel (25%)
Coins
• The one pound coin is composed of 70% copper, 5.5% nickel and 24.5% zinc, making this a bronze coin.
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