The most important thing in your world T4 L3
Give an example of a word and chemically balanced equation
Lead nitrate + magnesium sulfate -->Lead sulfate + magnesium nitrate
Pb(NO³)² <aq> + MgSO⁴ <aq> --> PbSO⁴ <s> + Mg(NO³)² <aq>
What are the main reactions
Thermal decomposition
Combustion
Thermite
Displacement reactions (including halegeon displacement)
Neutralisation
Reaction between metals and acids
Making insoluble and soluable salts
How do you know when the reaction has finished on a speed of reaction graph
The line becomes straight and flattened out.
Give an example of a fast reaction on a speed of reaction graph
4|........ /
3| ....../
2|.... /
1| ../
0| /
-----------------------
0 1. 2. 3. 4.
How is the rate of reaction caused
The result of movement of particles
How can we explain rates of reactions using collision theory
1. The more the particles collide the faster the reaction (collision frequency)
2. The more energy they collide with the faster the reaction will be (energy transfer)
How does a reaction occur
When products are formed from particle collisions
What is activation energy
The minium amount of energy required for the particles to react
What are the factors that affect the rate of reaction
1. Temperature
2. Surface area to volume ratio
3. Concentration or pressure
4. Presence of catalyst
What happens when temprature increaes during a possible reaction
Collision frequency increases
Increased kenetic energy
Particles movinf faster
Rate of reaction increased
What happens if you increase the concertration in a liquid
Collision frequency increases for the same volume
What happens if the pressure in a gas increases
Collision frequency increases for the same volume
What is the formula for gradient
..................Change in y
Gradient= ———————
.................Change in x