AQA Chemistry Unit 2 Revision Cards

What type of ions do non-metals form?
Negative ions.
1 of 35
What type of ions do metals form?
Positive ions.
2 of 35
What are the ion charges for the different groups?
Group Number Charge
3 of 35
Define a molecule.
2 or more atoms joined together by covalent bonds.
4 of 35
Define a covalent bond.
2 or more non-metals sharing electrons.
5 of 35
Is the intermolecular force between molecules strong or weak?
6 of 35
When a substance melts or boils, what force/bond is overcome?
Intermolecular forces.
7 of 35
Define intermolecular forces.
A weak force of attraction between molecules.
8 of 35
Do substances made from simple molecules have a high or low boiling/melting point?
They have a LOW boiling point, they only have weak intermolecular forces that are easily overcome.
9 of 35
Why do simple molecular substances not conduct electricity?
The molecules are neutral, they have no charge on them.
10 of 35
Define an ion.
An ion that has lost or gained electrons, so they are electrically charged (positive or negative).
11 of 35
Give the properties of an ionic compound.
-Giant lattice structure -Crystaline (in crystals) -High melting and boiling point -Conducts electricity when dissolved in water (aqueous), conducts electricity when molten, soluble in water.
12 of 35
Define a giant lattice.
Ions are ordered in a regular structure each ion is surrounded by ions of an opposite charge.
13 of 35
Fill in the missing word(s): The attraction between ions is known as _________________
Strong, electrostatic attraction.
14 of 35
Why do ionic substances have high melting/boiling points?
Because the strong electrostatic attractions has to be overcome, which requires a lot of energy.
15 of 35
Why do ionic substances conduct electricity when molten or aqueous?
They have free ions to move around.
16 of 35
Give three examples of giant covalent substances.
Graphite, diamond and silicon dioxide.
17 of 35
What are diamond and graphite both made of?
18 of 35
What are the properties of diamond?
-Each carbon atom is joined to 4 other carbon atoms. -High melting point (has lots of covalent bonds which need to be overcome) -Very hard -Does not conduct electricity.
19 of 35
What are the properties of graphite?
-Each carbon atom is joined to 3 other carbon atoms by covalent bonds. -It's in layers, which can slide over each other -High melting point (because of lots of covalent bonds) -Soft - atoms can slight over each other -It conducts electricity.
20 of 35
What is a delocalised electron?
An electron that is free to carry a charge.
21 of 35
What are fullorines?
Fullorines are made of linked carbon rings.
22 of 35
Give a use of fullorines.
Drug delivery into the body, lubricants, catalysts, and nanotubes for reinforcing.
23 of 35
Give 3 properties of silicon dioxide.
-High melting point -Giant structure -Each silicon atom is joined to 4 oxygen atoms, by covalent bonds.
24 of 35
Define an alloy.
A mixture of metals (often a metal mixed with carbon).
25 of 35
Why are alloys stronger than pure metal?
Alloys contain different sized atoms, and this disrupts the regular atom arrangement, preventing the layers of atoms sliding over each other.
26 of 35
Define a shape-memory alloy.
An alloy that returns to its original shape after being reformed. An example is nitinol (nickel and titanium) used in braces.
27 of 35
Why can pure metal be bent and hammered into shape?
The regular atom arrangement means that the atoms can slide over each other easily (malleable).
28 of 35
Define a polymer.
A chain of monomers joined by a polymerisation reaction.
29 of 35
Define a thermosoftening polymer and state its properties.
No cross-linking between polymer chains. Properties: -When heated, they soften and melt. -Recyclable.
30 of 35
Define a thermosetting reaction.
Cross-linking between polymer chains (covalent bonds). Properties: -Doesn't soften upon heating. -Non-recyclable.
31 of 35
Define a nano-particle.
Between 1&100 nanometres in size (Very small).
32 of 35
How do nano-particle properties differ from bulk materials?
-Different colour -Different strength -Different reactivity -Different thermal/electricity conductivity.
33 of 35
State 4 uses of nano-particles.
-Sunblock (contains titanium dioxide - reflects UV light) -Self-cleaning windows - titanium dioxide reflects rain. -Fullerines (made of tiny carbon particles). -Gold as a catalyst.
34 of 35
Define an ionic bond.
A metal and a non-metal chemically bonded by an attraction (metal loses electrons, non-metal gains electrons).
35 of 35

Other cards in this set

Card 2


What type of ions do metals form?


Positive ions.

Card 3


What are the ion charges for the different groups?


Preview of the front of card 3

Card 4


Define a molecule.


Preview of the front of card 4

Card 5


Define a covalent bond.


Preview of the front of card 5
View more cards





If I were to use these flashcards as revision recourses, would it cover the whole section c2?

Similar Chemistry resources:

See all Chemistry resources »See all Acids, bases and salts resources »