Chemistry revision Different substances and their properties

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  • Created by: melisa
  • Created on: 18-09-13 22:26
Which of the statements below is correct?
Ionic bonds are forces of attraction between oppositely-charged ions.
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Why do ionic compounds have high melting and boiling points?
Ionic compounds have high melting and boiling points because there are strong bonds between their ions.
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In what physical state or states do ionic substances conduct electricity?
Ionic substances conduct electricity when they are liquid or dissolved in water
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When a substance with a simple molecular structure boils, which bonds are broken?
When a molecular substance boils, the bonds broken are intermolecular bonds.
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Which of the following statements is true of substances with a simple molecular structure?
Substances with a simple molecular structure have low melting points and do not conduct electricity.
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Which of the following statements is true of diamond?
In diamond, each carbon atom is covalently bonded to four other carbon atoms.
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Which of the following statements is true of graphite?
In graphite, each carbon atom is covalently bonded to three other carbon atoms.
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Why are metals good conductors of electricity?
Metals are good conductors of electricity because they contain electrons that are free to move.
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What is the approximate size of a typical nanoparticle?
50 nm
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How many nanometres are there in a metre?
One billion
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Which statement about nanoparticles is correct?
Their properties are usually different from the substance in bulk.
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Why are titanium dioxide nanoparticles used in sunblock creams?
Titanium dioxide nanoparticles are used in sunblock creams because they block ultraviolet light but do not reflect visible light.
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Which statement about nanoparticles is correct?
They have a large surface area compared to their volume.
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Other cards in this set

Card 2

Front

Why do ionic compounds have high melting and boiling points?

Back

Ionic compounds have high melting and boiling points because there are strong bonds between their ions.

Card 3

Front

In what physical state or states do ionic substances conduct electricity?

Back

Preview of the front of card 3

Card 4

Front

When a substance with a simple molecular structure boils, which bonds are broken?

Back

Preview of the front of card 4

Card 5

Front

Which of the following statements is true of substances with a simple molecular structure?

Back

Preview of the front of card 5
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