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Atomic structure and bonding
Which of the statements below is correct?
Ionic bonds are forces of attraction between oppositely-charged ions.
Ionic bonds are forces of attraction between oppositely-charged atoms.
Ionic bonds are forces of attraction between positively-charged ions.
Why do ionic compounds have high melting and boiling points?
There are strong bonds between their atoms.
There are strong bonds between their ions.
There are strong bonds between their molecules.
In what physical state or states do ionic substances conduct electricity?
solid or dissolved in water
liquid or dissolved in water
solid or liquid
When a substance with a simple molecular structure boils, which bonds are broken?
Which of the following statements is true of substances with a simple molecular structure?
They have low melting points and conduct electricity.
They have low melting points and do not conduct electricity.
They have high melting points and do not conduct electricity.
Which of the following statements is true of diamond?
Each carbon atom is covalently bonded to three other carbon atoms.
Each carbon atom is covalently bonded to four other carbon atoms.
There are free electrons.
Which of the following statements is true of graphite?
There are no free electrons.
Why are metals good conductors of electricity?
They contain ions that are free to move.
They contain atoms that are free to move.
They contain electrons that are free to move.
What is the approximate size of a typical nanoparticle?
How many nanometres are there in a metre?
Which statement about nanoparticles is correct?
Their properties are usually the same as the substance in bulk.
Their properties are usually different from the substance in bulk.
Nanoparticles can be seen with a light microscope.
Why are titanium dioxide nanoparticles used in sunblock creams?
They give you white streaks on your skin that look really cool.
They block harmful visible light but let ultraviolet light through.
They block ultraviolet light but do not reflect visible light.
They have a large surface area compared to their volume.
They cannot be used as catalysts.
They are always 'inorganic' compounds such as titanium dioxide.