Chemistry C2 GCSE Revisio

22 cards

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Created Jan 23, 2012
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1
If you increase the temperature in a reversible reaction, what happens?
 
The endothermic reaction will increase.
2
If you decrease the temperature in a reversible reaction, what happens?
 
The exothermic reaction will increase.
3
If you increase the pressure in a reversible reaction, what happens?
 
The high pressure will favour the reaction which produces less volume.
4
If you decrease the pressure in a reversible reaction, what happens?
 
The low pressure will favour the reaction which produces more volume.
5
What is the concentration used in the Haber Process?
 
200 Atmospheres.
6
What is the temperature used in the Haber Process?
 
450°C.
7
What is an exothermic reaction?
 
A reaction which gives out heat.
8
What is an endothermic reaction?
 
A reaction which takes in heat.
9
In an endothermic reaction, how does the temperature change?
 
The temperature decreases.
10
In an exothermic reaction, how does the temperature change?
 
The temperature increases.
11
Explain what is meant by the term isotope.
 
Isotopes are different atomic forms of the same element, which have the same number of...
12
What types of elements bond ionically?
 
Non-metals and metals.
13
Why do ionic structures have high melting and boiling points?
 
Because they have very strong chemical bonds between all the ions in the giant structure.
14
Why do ionic structures conduct electricity when they are in solution?
 
Because when dissolved, the ions are separate and can carry the charge.
15
Why do ionic structures conduct electricity when they are molten?
 
Because the ions are free and they can carry the charge.
16
What type of elements bond covalently?
 
Non-metals.
17
Why are the melting and boiling points of simple molecular substances very low?
 
Because there are very weak intermolecular forces between the molecules, so they do not...
18
What state are molecular substances in at room temperature?
 
Gases or liquids.
19
Why don't molecular substances conduct electricity?
 
Because there are no ions.
20
Describe the structure and bonding of Diamond.
 
Each carbon atom forms 4 covalent bonds in a very rigid giant covalent structure.
21
Describe the structure and bonding of Graphite.
 
Each carbon atom only forms 3 covalent bonds, creating layers which are free to slide...
22
Why does Graphite conduct electricity?
 
There are de-localised electrons which can carry the charge.

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