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Greater Dublin Area (GDA) for Leaving Cert Geography

Tip: I found it extremely beneficial to know this chapter inside out and back to front. There is more to write about the GDA in comparison with the West of Ireland, and the questions are often easier to get big marks in. There’s a good bit in this chapter, but much of it is common sense or things you’d hear about on the news. Be specific; learn exact figures regarding population, average temperatures etc. This is a critical piece of advice across the entire geography course, but particularly in the Regional section. 

Our Geography notes are coming soon, subscribe to our emails to get all the important updates (it's free and secure) Physical processes  Climate  Cool temperate maritime  Lower precipitation (compared to the WoI). 800-1000mm per year. In rain shadow of Dublin Mountains (which are 1200m high) Sunshine- 4 hours per day average Summer temperature- 16 degrees Celsius Winter temperature- 5 degrees Celsius Growing season- 270 days Relief
Lowland region- low, flat land Dublin…

Collision Theory

Collision theory

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This accounts for the factors that influence the rate of reaction.

For a reaction to occur the reacting particles must collide with each other.

A collision only results in the formation of products if a certain minimum energy is exceeded in the collision - this is then described as an effective collision.

An effective collision: occurs when bonds are broken and new bonds are formed, bringing about the formation of products.

The rate of reaction depends on the number of e effective collisions per second between reacting particles.

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Activation Energy: 

is the minimum energy that colliding particles must have for a reaction to occur. Denoted Ea.

Low activation energy means a faster rate. Conversely, high activation energy means a slower rate.

1. Temperature:
increased temperature means that the kinetic energy of the molecules increases. Therefore, more collisions occur and hence more effective collisions must occur.

2. Nature of the reactants:
covalent compounds have to break bonds to react and
therefore they need more energy and so they have a higher activation energy.

3. Particle size:
smaller particles have a larger surface area for more collisions to occur. Therefore, more e ective collisions will occur and hence they will reach the activation energy more rapidly.

4. Concentration:
greater concentration means more particles and therefore more collisions, and hence more e ective collisions. Thus, the activation energy is reached more rapidly.

5. Catalyst:
it provides an alternative pathway with a lower activation energy.

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