AQA Chemistry 2
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Which type of bonding is present in water?
Which type of bonding is present in calcium carbonate?
Why are ionic sunstances high melting point solids?
there are strong forces of attraction between the oppositely charged ions
Why do covalent substances have low melting and boiling points?
There are weak forces of attraction between molecules
Why can graphite conduct electricity?
There are delocalised electrons
Why is diamond hard?
There are strong covalent bonds between the atoms
Why are metals malleable?
The layers of metal ions can slide over each other
Why is an alloy?
a mixture of metals
Why are alloys harder than pure metals?
the layers of metal ions are distorted and cannot easily slide over each other
What is unusual about nano particles?
they are VERY tiny
Why can an ionic sunstance conduct electricity when molten or in solution?
the ions are free to move
Which class of polymer cannot melt once formed?
Sodium has an atomic number of 11 and a mass number of 23.
How many protons, neutrons and electrons are in each sodium atom?
- 11 protons
- 11 electrons
- 12 neutrons
How are the electrons arranged in a chlorine atom (17 electrons)?
Why do atoms form chemical bonds?
To get a full outer shell of electrons
What is a smart memory alloy?
An alloy that returns to its original shape after being deformed
Magnesium has 12 electrons.
What will be the formula of a magnesium ion?
Oxygen has 8 electrons.
What is the formula of an oxide ion?
What is the formula of calcium chloride?
( Ions present are Ca2+ and Cl- )
What is the formula of calcium hydroxide?
( ions present are Ca2+ and OH- )
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