Chemistry - Metals topic

  • Created by: Kalitise
  • Created on: 09-06-18 14:19
What properties do all metals have?
All metals; conduct electricity, conduct heat, are malleable and are ductile.
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Many metals are s_____.
Strong.
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Why was Gold used in some of the first coins?
Gold was used in some of the first coins because it does not react with water, air, alkalies and most acids.
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Define the term alloy and give an example of one.
An alloy is a mixture of metals. Steel is an example of an alloy.
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Why are alloys created?
Alloys can have different properties properties to put metals making them more suitable for a purpose.
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Metals are a ______ r________
Finite resource
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Why is recycling metals important
It is important to recycle metals because they they are a finite resource. By reusing them, we can ensure that they won't run while also saving money and the environment.
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Name two very unreactive metals.
Gold and Platnium
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Most metals react with ______
Oxygen.
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What can you *often* see on metal that has been oxidised?
Discolouration of the metal surface.
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What are the products of metal + water?
Metal hydroxide + hydrogen. (Water contains hydrogen)
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What are the products of metal + acid?
Salt + hydrogen
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What is formed when a metal reacts with hydrochloric acid?
A chloride salt + hydrogen. (Zinc + Hydrogen ➡️ Zinc Chloride + hydrogen).
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How can you remember the names of the metals that react with acid?
MAZIT.
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Name the metals that react with acid.
Magnesium, aluminium, Zinc, Iron and Tin.
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What is corrosion?
Corrosion is the reaction of metals to form compounds.
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What is the correlation between a metal's reactivity and the speed at which it corrodes? Why?
The most reactive metals corrode faster because they react with their surroundings quickly.
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What can be used to test for corrosion? What will it change to?
Ferroxyl indicator changes from yellow -> blue in the presence of corrosion.
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How can you protect metals from corrosion? (Give four examples)
1. keeping it in oil 2. By painting it 3. by covering it in a plastic coating 4. By covering it in metal plating.
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What must you do to prevent corrosion?
To prevent corrosion we must prevent water and oxygen from touching a metal's surface.
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What are the three methods of extracting metals?
Heat, extraction and electrolysis.
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What determines which metal extraction method you should use
The reactivity of the metal you want to remove.
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Give an example of a metal that can be found uncombined in the earth.
Gold.
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What is the correlation between the reactivity of a metal and how much energy is required to separate them?
As metals become more reactive they require more energy to remove from their ores.
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Give two examples of metals that can be separated through heat alone.
Silver and mercury.
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Which metals can be separated through extraction?
The moderately reactive metals such as Copper, Iron, Tin and Lead
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To extract metals through reduction what do you have to do?
Heat the ore with carbon.
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Does the process of extracting metals through reduction require a lot of energy? Why?
Yes because it requires additional chemicals to overcome the stronger bonds of the more reactive metals.
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Which metals can be separated though electrolysis?
The reactive metals like aluminium and magnesium.
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What are the roots of the words electrolysis?
Electro - electricity lysis - break
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How much energy does electrolysis require?
Electrolysis requires a large amount of energy.
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In electrolysis, which elements will be attracted to the negative charge and which will be attracted to the positive charge?
The metal elements will be attracted to the negative charge and the non-metals will be attracted to the positive side.
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What does electrolysis do?
Electrolysis separates metal and non metal elements using a direct current.
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What is a battery?
A battery is a portable source of electrical energy that is made through chemical reactions.
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Why do batteries stop working?
Because the chemicals that react to produce electricity run out.
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How can electricity be produced?
By connecting two different metals with an electrolyte.
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what is an electrolyte?
An electrolyte is a solution of salt (containing metal and non-metal elements).
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What does the electrolyte do?
The electrolyte completes the circuit.
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In an electrolyte, how do the electrons flow?
From the most -> least reactive metal.
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Do the least reactive metals gain or lose electrons in an electrolyte?
They gain electrons.
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what is the environmental impact of electrolysis?
The process requires a lot of energy which negatively impacts the environment by using up electricity.
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Other cards in this set

Card 2

Front

Many metals are s_____.

Back

Strong.

Card 3

Front

Why was Gold used in some of the first coins?

Back

Preview of the front of card 3

Card 4

Front

Define the term alloy and give an example of one.

Back

Preview of the front of card 4

Card 5

Front

Why are alloys created?

Back

Preview of the front of card 5
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