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Questions and Answers
Increasing the ______ increases the rate of reaction because the particles collide more often with more energy.
Increasing the ______ increases the rate of reaction because the particles collide more often with more energy.
temperature
Concentration refers to the number of ______ particles per unit volume.
Concentration refers to the number of ______ particles per unit volume.
reactant
Only exposed particles at the ______ are able to collide with other reactant particles to form products.
Only exposed particles at the ______ are able to collide with other reactant particles to form products.
surface
The smaller the ______ size the faster the reaction.
The smaller the ______ size the faster the reaction.
Catalysts speed up the rate of reaction by providing an alternative reaction pathway that lowers the ______ energy.
Catalysts speed up the rate of reaction by providing an alternative reaction pathway that lowers the ______ energy.
The higher the ______ of the reactants, the faster the rate of reaction will be.
The higher the ______ of the reactants, the faster the rate of reaction will be.
Four indications that a chemical reaction has taken place are: temperature change, colour change, formation of a ______, and fizzing/bubbling.
Four indications that a chemical reaction has taken place are: temperature change, colour change, formation of a ______, and fizzing/bubbling.
According to the Collision Theory, reactant particles must collide with enough ______ to overcome the activation energy barrier.
According to the Collision Theory, reactant particles must collide with enough ______ to overcome the activation energy barrier.
Reaction Rate is the speed of a chemical reaction, which is the time it takes for the reactants to be converted to ______.
Reaction Rate is the speed of a chemical reaction, which is the time it takes for the reactants to be converted to ______.
A reaction with a ______ rate of reaction would take a long time for the reactants to be turned into products.
A reaction with a ______ rate of reaction would take a long time for the reactants to be turned into products.
The four factors that affect the rate of a chemical reaction are: temperature, concentration, particle size or ______, and use of a catalyst.
The four factors that affect the rate of a chemical reaction are: temperature, concentration, particle size or ______, and use of a catalyst.
If the temperature is increased, the particles have more ______ and so move quicker.
If the temperature is increased, the particles have more ______ and so move quicker.
For a reaction to occur, the particles reacting must collide with each other with the correct ______.
For a reaction to occur, the particles reacting must collide with each other with the correct ______.
The ______ energy is the amount of energy needed for a chemical reaction to proceed.
The ______ energy is the amount of energy needed for a chemical reaction to proceed.
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Study Notes
Indications of a Chemical Reaction
- Temperature change
- Colour change
- Formation of a precipitate
- Fizzling or bubbling, indicating gas production
Collision Theory
- Reactant particles must collide with enough energy to overcome the activation energy barrier
- Reactant particles must collide with the correct orientation
- Most collisions don't result in the formation of products
Activation Energy
- The minimum amount of energy that molecules need to possess to have successful collisions and form products
- The energy needed for a chemical reaction to proceed
Reaction Rate
- The speed of a chemical reaction (time it takes for reactants to be converted to products)
- Slow rate of reaction: takes a long time for reactants to be converted to products
- Fast rate of reaction: takes a short amount of time for reactants to be converted to products
Factors Affecting Reaction Rates
- Temperature: increasing temperature increases the rate of reaction due to more energetic particles
- Concentration: increasing concentration increases the rate of reaction due to more particles colliding
- Particle size or surface area: increasing surface area increases the rate of reaction due to more exposed particles colliding
- Use of a catalyst: lowers the activation energy, increasing the rate of reaction
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