The Rate and Extent of Chemical Change
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If you want to measure the rate of a reaction you can measure how fast one of the __________ is formed. What one word completes this sentence?
products
If you want to measure the rate of a reaction you can measure how fast one of the __________ is used up. What one word completes this sentence?
reactants
A reaction between two particles cannot happen unless the particles have enough __________ when they collide. What is the missing word?
energy
If you want to increase the rate of a reaction, should you increase, decrease or make no change to the pressure?
increase
True or false? Decreasing the temperature increases the number of collisions between reacting particles.
false
Magnesium reacts with acid to give a salt and hydrogen. Will this reaction happen faster using magnesium ribbon or magnesium powder?
magnesium powder
Magnesium reacts with acid to give a salt and hydrogen. Why does the reaction happen faster because you use magnesium powder?
Powdered solids have a faster rate of reaction because they have a larger surface area.
For a reaction to happen the reacting particles must successfully __________ with one another. What word completes this sentence?
bond
True or false? If the same reaction is carried out twice, once at high pressure and once at low pressure, the reaction at low pressure will have a shorter reaction time.
false
At ____ ______, there are more particles per unit volume.
higher pressures
At higher pressures, there are more ________ per unit volume.
particles
the amount of energy needed for the reaction to occur
activation energy
Does increasing the surface area of a solid reactant increase, decrease or have no effect on the frequency of collisions between the reacting particles?
increase
True or false? Increasing the temperature rarely has an effect on the speed of the reacting particles.
false
Does decreasing the temperature increase the rate of a reaction?
no
Why does increasing the concentration of reactants increases the reaction rate?
the reactant particles are more crowded so they collide more often
What word is used to describe how fast or slow a reaction is?
rate
True or false? Catalysts do not change the rates of chemical reactions.
false
Does a catalyst increase, decrease or have no effect on the rate of a reaction?
increase
An iron catalyst is used to lower the activation energy of a reaction. What effect will this have on the overall energy change of the reaction?
stay the same
Catalysts work by lowering the __________ __________. What two words complete the sentence?
activation energy
True or false? Different reactions require different catalysts.
true
What name is given to any chemical which increases the rate of a chemical reaction?
catalyst
True or false? Catalysts are important in industrial processes because they reduce costs.
true