c5

Post-2011 ocr gcse chemistry, module c5 in detail.

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  • Created by: AgnesC
  • Created on: 14-01-13 01:41
What percentage of nitrogen is there in air?
There is 78% nitrogen in air.
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There is 22% oxygen in air, true or false?
False, there is 21% oxygen in air.
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What percentages are there of argon and carbon dioxide in the air?
There is 1% argon and 0.04% carbon dioxide in the air.
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No gases in the air are molecular substances, true or false?
False, most gases in the air are molecular substances.
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The atoms in molecular substances are held together by very xxxxxx covalent bonds, fill in the blank.
Strong, the atoms in molecular substances are held together by very strong covalent bonds.
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The forces of attraction between molecular substances are xxxxxx, fill in the blank.
Weak, the forces of attraction between molecular substances are weak.
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Molecular substances have high melting and boiling points, true or false.
False, molecular substances have low melting and boiling points.
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Why do molecular substances have high melting and boiling points?
Molecular substances have high melting and boiling points because the weak forces of attraction between the molecules need little energy to break.
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True or false, molecular substances don't conduct electricity.
True molecular substances don't conduct electricity.
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Which form molecular substances, metals or non-metals?
Non-metals (and compounds formed from non-metals) form molecular substances but not all of them.
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A covalent bond occurs when atoms xxxxxxxxx electrons, fill in the blank.
Share, a covalent bond occurs when atoms share electrons.
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The force that causes attraction between the positive nuclei and the negative electrons is called what?
Electrostatic attraction, the force that causes attraction between the positive nuclei and the negative electrons is called electrostatic force.
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Name three ways of representing molecules.
The molecular formula, the displayed formula and the 3-D model.
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What is the earth's hydrosphere?
The earth's hydrosphere is all the water in the earth's oceans, seas, lakes, puddles etc.
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True or false, the hydrosphere does not include compounds dissolved in the hydrosphere.
False, the hydrosphere does include compounds dissolved in the hydrosphere.
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Ionic compounds have high melting and boiling points, true or false?
True, ionic compounds have high melting and boiling points.
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Why do ionic compounds have high melting and boiling points?
Ionic compounds have high melting and boiling points because the forces of attraction between the molecules are very strong.
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Ionic compounds conduct electricity when solid, true or false?
False, ionic compounds conduct electricity when dissolved or molten.
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What is a precipitation reaction?
A precipitation reaction is reaction during which two solution react to form an insoluble solid compound (precipitate).
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Add an alkali to most solutions and form what precipitate?
Add an alkali to most solutions and form a metal hydroxide.
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You can sometimes identify which metal ion is in a solution by adding sodium hydroxide, how?
You can sometimes identify which metal ion is in a solution by adding a sodium hydroxide because if you get a coloured precipitate you can tell which metal was in the compound.
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What colour precipitate would sodium hydroxide and calcium form?
Sodium hydroxide and calcium forms a white precipitate.
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What colour precipitate would sodium hydroxide and copper form?
Sodium hydroxide and copper forms a blue precipitate.
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What colour precipitate would sodium hydroxide and iron II form?
Sodium hydroxide and iron II form a green precipitate.
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What colour precipitate would sodium hydroxide and iron III form?
Sodium hydroxide and iron III form a reddish brown precipitate.
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What colour precipitate would sodium hydroxide and zinc form?
Sodium hydroxide and zinc would form a white precipitate that then would turn colourless.
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What is the difference between a normal chemical equation and an ionic chemical equation?
A normal chemical equation shows the entire reaction, an ionic chemical equation shows only a certain part, the part you want to see.
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How do you test for carbonates?
Add hydrochloric acid and then use limewater to test for carbon dioxide.
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How do you test for sulfates?
Add hydrochloric acid and then barium chloride, look for a white precipitate.
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How do you test for halides?
Add nitric acid and then silver nitrate and check colour of precipitate.
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After testing for halides which colour precipitate indicates chloride?
A white precipitate indicates chloride.
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After testing for halides which colour precipitate indicates bromide?
A cream precipitate indicates bromide.
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After testing for halides which colour precipitate indicates iodie?
A yellow precipitate indicates iodide.
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How do you test for carbonates?
Add hydrochloric acid and then use limewater to test for carbon dioxide.
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What is the lithosphere?
The lithosphere is the earths rigid outer layer comprising the crust and parts of the mantle.
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How do you test for sulfates?
Add hydrochloric acid and then barium chloride, look for a white precipitate.
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How many covalent bonds do carbon atoms in diamond form?
Four.
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How do you test for halides?
Add nitric acid and then silver nitrate and check colour of precipitate.
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How many covalent bonds do carbon atoms in graphite form?
Three.
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After testing for halides which colour precipitate indicates chloride?
A white precipitate indicates chloride.
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Which conducts electricity, graphite or diamond?
Graphite conducts electricity.
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After testing for halides which colour precipitate indicates bromide?
A cream precipitate indicates bromide.
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Name a giant covalent structure similar to diamond.
A giant covalent structure similar to diamond is silicon dioxide.
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After testing for halides which colour precipitate indicates iodie?
A yellow precipitate indicates iodide.
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What are two other name for silicon dioxide?
Two other name for silicon dioxide are silica and sand.
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What is the lithosphere?
The lithosphere is the earths rigid outer layer comprising the crust and parts of the mantle.
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True or false you can often mine pure metals?
False, you can rarely mine pure metals.
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How many covalent bonds do carbon atoms in diamond form?
Four.
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Which is more liekely to be found pure, nonreactive gold or very reactive sodium?
Nonreactive gold is more likely to be found.
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How many covalent bonds do carbon atoms in graphite form?
Three.
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How does reduction (involved with mining) work?
During reduction more reactive carbon displaces a less reactive metal leaving carbon dioxide and a pure metal.
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Which conducts electricity, graphite or diamond?
Graphite conducts electricity.
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What does electrolysis mean?
Electrolysis means the decomposition (or breaking down) of a substance using electricity.
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Name a giant covalent structure similar to diamond.
A giant covalent structure similar to diamond is silicon dioxide.
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What are two other name for silicon dioxide?
Two other name for silicon dioxide are silica and sand.
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During electrolysis do electrons move from or to the negative electrode?
During electrolysis electrons move to the negative electrode.
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True or false you can often mine pure metals?
False, you can rarely mine pure metals.
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During electrolysis do electrons move from or to the positive electrode?
During electrolysis electrons move from the positive electron.
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Which is more liekely to be found pure, nonreactive gold or very reactive sodium?
Nonreactive gold is more likely to be found.
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What two things are metals good at conducting?
Metals are good at conducting heat and electricity.
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How does reduction (involved with mining) work?
During reduction more reactive carbon displaces a less reactive metal leaving carbon dioxide and a pure metal.
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Most metals have high melting and boiling points, true or false?
True, most metals have high melting and boiling points.
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What does electrolysis mean?
Electrolysis means the decomposition (or breaking down) of a substance using electricity.
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True or false, ores are infinite?
False, ores are finite meaning they can and will run out.
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During electrolysis do electrons move from or to the negative electrode?
During electrolysis electrons move to the negative electrode.
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Why is recycling a good idea?
Recycling is a good idea because it saves power, money and energy.
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During electrolysis do electrons move from or to the positive electrode?
During electrolysis electrons move from the positive electron.
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What are three elements abundant in the earths lithosphere?
Three elements abundant in the earths lithosphere are silicon, oxygen and aluminium.
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What two things are metals good at conducting?
Metals are good at conducting heat and electricity.
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Why do metals have high melting and boiling points?
Metals have high melting and boiling points because because the metallic bonds that bind them take a lot of energy to break.
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Give an example of a)a metal that can be extracted by reduction and b)a metal that can be extracted by electrolysis?
a)zinc b)aliminium
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Most metals have high melting and boiling points, true or false?
True, most metals have high melting and boiling points.
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True or false, ores are infinite?
False, ores are finite meaning they can and will run out.
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Why is recycling a good idea?
Recycling is a good idea because it saves power, money and energy.
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What are three elements abundant in the earths lithosphere?
Three elements abundant in the earths lithosphere are silicon, oxygen and aluminium.
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Why do metals have high melting and boiling points?
Metals have high melting and boiling points because because the metallic bonds that bind them take a lot of energy to break.
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Give an example of a)a metal that can be extracted by reduction and b)a metal that can be extracted by electrolysis?
a)zinc b)aliminium
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Other cards in this set

Card 2

Front

There is 22% oxygen in air, true or false?

Back

False, there is 21% oxygen in air.

Card 3

Front

What percentages are there of argon and carbon dioxide in the air?

Back

Preview of the front of card 3

Card 4

Front

No gases in the air are molecular substances, true or false?

Back

Preview of the front of card 4

Card 5

Front

The atoms in molecular substances are held together by very xxxxxx covalent bonds, fill in the blank.

Back

Preview of the front of card 5
View more cards

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