rate of reactions
- Created by: tickelyweenus
- Created on: 07-04-19 17:35
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- rates of reaction
- reactions
- slow
- rusting
- fast
- burning
- faster
- explosion
- slow
- collision theory
- particles must collide with enough energy in order to react
- how often do the particles collide.
- how much energy is transferred in the collisions.
- depends on four things
- temperature
- when increased, particles move faster
- faster they move, the faster they collide
- more energy, so collisions will have enough energy in order to react
- when increased, particles move faster
- concentration and pressure
- more concentrated, more particles collide.
- more pressure, more particles collide.
- surface area
- break into smaller pieces, same volume, more area, more frequent collisions.
- catalyst
- catalysts lower activation energy. easier to break bonds and react.
- temperature
- rate of reaction = amount of reactant used or amount of product formed / time
- three ways of measuring the rate of reactions
- precipitation and colour change
- clear solution becomes opaque. cross under the conical flask. how long until the cross becomes impossible to see?
- how long does it take to lose or change colour?
- change in mass
- usually produces a gas. the quicker the mass is lost, the quicker the reaction. measure regularly. plot a reaction graph.
- volume of gas given off.
- use a gas syringe. more gas given off in an interval of time, the faster the reaction.
- precipitation and colour change
- reactions
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