AQA GCSE Additional Chemistry

HideShow resource information
What is a compound ?
A substance made when two or more elements are chemically bonded together.
1 of 29
What is Ionic Bonding ?
The electrostatic force of attraction between positively and negatively charged ions.
2 of 29
What is a Covalent bond ?
The attraction between two atoms that share one or more pairs of electrons.
3 of 29
Name some properties of Ionic Structures..
They have very strong electrostatic forces and high melting and boiling points
4 of 29
What type of structure does an ionic bond have ?
When solid, the positive and negative ions are structured in a lattice formation and are therefore sat in a fixed position
5 of 29
Ionic structures can only conduct electricity..
In a solution or when molten
6 of 29
What happens to ionic structures in a solution ?
The water molecules break these bonds , the electrical charge then flows through the now free electrons
7 of 29
What holds the ions together in an ionic compound ?
Electrostatic forces
8 of 29
Why do ionic compounds have high melting and boiling points ?
It takes a lot of energy to break up a giant ionic lattice
9 of 29
Why is seawater a better conductor of electricity compared to freshwater?
There is salt in the sea and salt is an ionic compound therefore the ions move freely, allowing charge to flow through
10 of 29
Properties of a Diamond structure?
High melting/boiling points,four strong covalent bonds,doesn't conduct electricity,used for jewelry and cutting tools ,insoluble in water,bond shape=tetrahedral
11 of 29
Properties of a Graphite structure?
Can be used for pencils(lead),has one delocalised electron which allows it to conduct electricity,has three strong covalent bonds,the layer slide,bond shape;hexagon,no bonds between layers, it is a soft and slippery material
12 of 29
Properties of a Buckminster Fullerene
Has cage-like strong covalent bonds which are pentagonal and hexagonal shaped , it has three bonds, it can manipulate it's own bond shape , has one delocalised electron so can conduct electricity,medical uses :targeting cells and viruses
13 of 29
What is an Allotrope?
An allotrope is made out of the same substance(one atom type _)but has different forms
14 of 29
Properties in metals of Giant Metallic Structurs
Ductile,shiny,maluable,good conductors of heat and electricity,solid at room temperature(except for mercury),high melting/boiling point,not brittle,atoms are arranged in layers
15 of 29
What is a shape memory alloy ?
A shape memory alloy is when deformed metals are reheated and turn back into their original state
16 of 29
What is a Polymer?
A very big and long molecule
17 of 29
What is a Polymer made of ?
Very small molecules name monomers
18 of 29
What is Polymerisation?
This is when lots of monomers join to make a polymer
19 of 29
What are the two types of polymer?
High and low density
20 of 29
Properties of Low density polymers..
Requires very high pressure and a small amount of oxygen, polymer chains can't pack tight together
21 of 29
Properties of High density polymers..
Requires slight pressure at 50 degrees with a catalyst,molecules can pack tightly together , it forms strong plastics
22 of 29
What is a thermosoftening polymer?
A type of polymer that can be reformed on heating
23 of 29
What is a theremosetting polymer?
A polymer that cannot be reformed on heating due to the strong covalent bonds between chain of molecules
24 of 29
What is nanotechnology?
Nanotechnology is the engineering of functional systems at the molecular scale
25 of 29
Some benefits of Nanotechnology...
It revolutionises electronic products(nano diodies, LED's etc),benefits the energy sector,clean and highly efficient in manufacturing,radically improved formulation of drugs;diagnostics and organ replacement
26 of 29
Facts about nanotechnology
Comes from the Greek word "nanos" , which means "dwarf" and one nanometre is one millionth of a millimetre
27 of 29
Risks of nanotechnology..
Health issues-the effects of nanomaterials on the human body,environmental issues-the effects of nanomaterials on the environemtn,speculative issues,societal issues
28 of 29
What is an isotope?
Atoms that have the same number of protons but different numbers of neutrons in their nuclei
29 of 29

Other cards in this set

Card 2

Front

What is Ionic Bonding ?

Back

The electrostatic force of attraction between positively and negatively charged ions.

Card 3

Front

What is a Covalent bond ?

Back

Preview of the front of card 3

Card 4

Front

Name some properties of Ionic Structures..

Back

Preview of the front of card 4

Card 5

Front

What type of structure does an ionic bond have ?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all General resources »