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Rate of Reaction (11 Grade)
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Which changes decrease the rate of reaction between magnesium and air? 1 heating the magnesium to a higher temperature 2 using a higher proportion of oxygen in the air 3 using magnesium ribbon instead of powdered magnesium
3 using magnesium ribbon instead of powdered magnesium
Grinding a effervescent tablet into powder increases the rate of reaction due to increased
surface area
What is the rate of reaction?
How fast a reaction is in a certain time
The ______________is minimum energy required to make a successful collision between each particle.
Activation energy
When surface area is decreased the rate of reaction...
Decreases, because there are LESS possible sites for correct collisions
The major theory of reaction rate is called
Collision theory
What is the unit of concentration?
mol/dm3
Which is the highest concentration? 10m 2M 25 mmol 0.5M
2 M
How could we make this reaction happen more quickly? This is reaction between an acid and chalk.
crush the chalk to increase the surface area
To slow down a chemical reaction you will do one of the following: Place the reactants in hot water Place the products in ice bath Place the reactants in a ice bath Keep stirring the reactants with a stirring rod
Place the reactants in a ice bath
Why does a higher temperature increase the rate of a reaction?
it increases both the frequency and energy of particle collisions
Why don't all collisions between particles cause a reaction?
not all the particles collide with enough energy
Which of the following increase the reaction rate? less surface area lower temperature an inhibitor increased concentration
increased concentration
Why does a catalyst increase the rate of reaction?
it reduces the activation energy of the reaction
Why increasing in temperature of the reactants can increase rate of reaction?
increase collision between the particles thus increasing the rate.
Mention 4 factors increase the rate of a reaction.
increasing temperature, increasing concentration, increasing surface area, adding catalyst
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