Year 9 Science: Chemistry Revision 2012

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Year 9 Science: Chemistry Revision 2012 


 
  
Created Sep 9, 2012
by
lilliellen19

 

 
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1

What subatomic particles (Pro, Neu, Elec) are found in atoms; their properties and location
 
Protons: positive, heavier, located in the nucleus Neutrons: neutral, heavier,...
2

·         Terms...

 
- Symbol- how many protons, electrons and neutrons- atomic and mass no.- non-metal/metalloid/metal?
3

·         Symbol...

 
e.g.  
4

 
element - the basic building of all matter (e.g. carbon)molecule - a group of atoms bonded...
5

·         What...

 
In 1869 Russian chemist Dmitri Ivanovich Mendeleevarranged the known elements in order of atomic...
6

·         Where...

 
in the same groups
7

·         The...

 
-
8



How are electrons arranged in atoms – shells, electron configuration
 
Electrons are arranged on shells that orbit around the nucleus. the electrons are arranged...
9

·         Relationship...

 
 - 
10

·         What...

 
Group VIII are the noble gases. 
11

·         Properties...

 
metals - left side, shiny, ductile, good heat conductors and electricity 
non-metals...
12

·         

 
A hydrogen atom only has one electron. It can emptyits K electron shell by losing this electron...
13
       What is unusual about helium compared to other Group VIII elements.

 
A helium atom has 2electrons that fill its onlyshell. Helium therefore has similar properties...
14

· 

 
The metalloids (sometimes called semi-metals) actlike non-metals in most ways. They do, however,...
15

·         Location...

 
 noble gases - group VIII (e.g. neon)halogens - group VII (e.g. fluorine)alkali...
16
Trends within each group
 
-
17

 

Simple - Ions are charged particles that have an unequal number of protons and electrons.
Polyatomic...
18
Very basic Ionic Compounds

 

Positive ions attract negative ions. This attraction,called electrostatic attraction, forms...
19
 Molecules

 
Diatomic molecules are very common. Mostof the air we breathe is made up of the diatomicmolecules...
20
 Solutions – solvent, solute, 
 
A solution is a liquid with something dissolved in it. the solute is the...
21
concentrations??
 
-
22

·         Physical...

 
Perhaps it’s easiest to start with things that aredefinitely not chemical changes. When waterturns...
23


                       Chemical...
 
A chemical change is one where anew substance is formed. Sometimeschemical change is very obvious:exploding...
24



       Signs of Chemical change (basic signs)




 
• a permanent colour change occurs, e.g. a carrusting• a gas is given off, e.g. a Berocca...
25

·         What...

 
 - have a sour taste- turn blue litmus red- conduct electricity when mixed with water...
26
                         ...
 
 - opposites of acids- neutralise acids by reacting with them to produce water and other substances -...
27
                          ...
 
- the pH is used to compare the relative acidity of substances in solution- pH scale (at 25...

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