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- Multiple ChoicePlease save your changes before editing any questions.
What criteria must be met for reactant collisions to result in a successful product?
The reactants must collide with each other
The reactants must collide with enough energy and be in the right positions
The reactants must have enough energy to form the activated complex
- Multiple ChoicePlease save your changes before editing any questions.
The energy needed by reactants for an effective collision is called the
activation energy
change in entropy
change in enthalpy
free energy
- Multiple ChoicePlease save your changes before editing any questions.The rate of a reaction increases as temperature__________________.DecreasesIncreasesStays the Same
- Multiple ChoicePlease save your changes before editing any questions.
Products will form faster if____________
the surface area of the reactants are smaller.
temperature is decreased.
concentration of the reactants are increased.
the reaction is not stirred.
- Multiple ChoicePlease save your changes before editing any questions.A ______________ is a substance that increases the rate of a reaction without being used up during the reaction.catalystproductreactantsolute
- Multiple ChoicePlease save your changes before editing any questions.Smaller particle size allows for a _________ surface area to be exposed for the reaction.largersmaller
- Multiple ChoicePlease save your changes before editing any questions.Activation energy is required to start a chemical reaction. What is activation energy?The maximum amount of energy usedThe minimum amount of energy required to cross the reaction barrierThe energy of the reactantsThe energy possessed by the products
- Multiple ChoicePlease save your changes before editing any questions.Which factors increase the rate of a reaction.increasing temperatureincreasing concentrationincreasing surface areaall of these
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What letter represents the activation energy?ABCD - Multiple ChoicePlease save your changes before editing any questions.
Why does a higher temperature increase the rate of a reaction?
because it increases both the frequency and energy of particle collisions
because it only increases the frequency of particle collisions
because it only increases the energy of particle collisions
because it reduces the activation energy of the reaction
- Multiple ChoicePlease save your changes before editing any questions.Rate of chemical reaction meansamount of product formedspeed of reactionconcentration of reacting particlescombining reactants with products
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What is a catalyst?
A substance that increases the activation energy
A substance that lowers the activation energy
A substance that reacts with reactants
A substance that increases the kinetic energy particles have
- Multiple ChoicePlease save your changes before editing any questions.
Adding a catalyst ___________ the activation energy.
Raises
Lowers
Doesn't affect
Inreases
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As the frequency of ______________ increases, the rate of reaction increases.
Time
Reactions
Collisions
Reactants
- Multiple ChoicePlease save your changes before editing any questions.
A temperature increase causes the particles ......
to slow down
move faster
in the right order
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List four factors that affects the rate of a reaction (you may answer more than one)
temperature
concentration
surface area
volume
catalysts
- Multiple ChoicePlease save your changes before editing any questions.
In case of flour mill, flour is produced and stored to drum storage. The drum falls then it explodes. How can it happen?
because the particle are very small that makes a large surface area. When it gets contact with the air, a small spark can cause an explosion
Because the particle has low density that makes easy to be combusted
Because the flour has High Explosive Level
Because flour has mixed with gasoline that makes easy to explode
- Multiple ChoicePlease save your changes before editing any questions.
What makes the explosion occur in a coal mine?
Due to the certain concentration of fllammable gas contact with air
Due to the pressure of air
Due to the certain temperature of flammable gas
Due to the density of gas and air
- Multiple ChoicePlease save your changes before editing any questions.
Why don't all collisions between particles cause a reaction?
The particles also need to collide with a catalyst.
Not all colliding with enough energy and correct orientation
Not all particles collide at a high enough temperature.
The particles need to collide with each other twice.
- Multiple ChoicePlease save your changes before editing any questions.
Which line represents the fastest reaction?
A
B
C
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According to the graph, it can be concluded that
As reaction progresses, the concentration of product will reduce and the reactant will increase
As reaction progresses, the concentration of product and reactant will reduce
As reaction progresses, the concentration of product and reactant will increase
As reaction progresses, the concentration of product will increase, the reactant will reduce
- Multiple ChoicePlease save your changes before editing any questions.
Using data from the table, when did the reaction stop?
0 s
20 s
60 s
80 s
- Multiple ChoicePlease save your changes before editing any questions.
When measuring the mass of carbon dioxide rates, what is a suitable unit?
cm2/min
cm2/sec
gr/min
mol/dm3
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All chemical reactions happen at the same speed.
true
false
- Multiple ChoicePlease save your changes before editing any questions.
Which of these is not a method for measuring the rate of a reaction?
Measure the change in amount of reactant A.
Measure the change in amount of reactant B.
Measure the change in amount of product.
Measure the change in the amount of catalyst.