Chemistry Rates Of Reaction
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Publicado: 29 de agosto de 2011
18.1 Rates of Reaction
Explain the collision theory of reactions.
Chemical reactions require collisions with sufficient energy to break and form bonds.How is the activation energy of a reaction like a wall or barrier?
Reactant particles must have a certain minimum amount of energy to react to form product, just as ittakes a certain amount of energy to climb over a wall or barrier.
How is the rate of a reaction influenced by a catalyst? How do catalysts make this possible?A catalyst increases the rate of reactions by providing an alternative reaction mechanism with a lower activation energy.
Which of these statements is true?Enzymes are biological catalysts.
When the gas to a stove is turned on, the gas does not burn unless lit by a flame. Once lit, however, the gas burns until turned off.Explain these observations in terms of the effect of temperature on reaction rate.
Gas molecules and oxygen molecules do not have enough energy to react at room temperature. The flame raisesthe temperature and the energy of collisions, so the reaction begins. The heat released by the reaction maintains the high temperature, and the reaction continues spontaneously.18.2 Reversible Reactions and Equilibrium
In your own words, define a reversible reaction.
In a reversible reaction, reactants are continually forming products andproducts are continually forming reactants.
How do the rates of the forward and reverse reactions compare at a state of dynamic chemical equilibrium?
They are equal.What is Le Châtelier’s principle? Use it to explain why carbonated drinks go flat when their containers are left open.
A system in dynamic equilibrium changes...
Explain the collision theory of reactions.
Chemical reactions require collisions with sufficient energy to break and form bonds.How is the activation energy of a reaction like a wall or barrier?
Reactant particles must have a certain minimum amount of energy to react to form product, just as ittakes a certain amount of energy to climb over a wall or barrier.
How is the rate of a reaction influenced by a catalyst? How do catalysts make this possible?A catalyst increases the rate of reactions by providing an alternative reaction mechanism with a lower activation energy.
Which of these statements is true?Enzymes are biological catalysts.
When the gas to a stove is turned on, the gas does not burn unless lit by a flame. Once lit, however, the gas burns until turned off.Explain these observations in terms of the effect of temperature on reaction rate.
Gas molecules and oxygen molecules do not have enough energy to react at room temperature. The flame raisesthe temperature and the energy of collisions, so the reaction begins. The heat released by the reaction maintains the high temperature, and the reaction continues spontaneously.18.2 Reversible Reactions and Equilibrium
In your own words, define a reversible reaction.
In a reversible reaction, reactants are continually forming products andproducts are continually forming reactants.
How do the rates of the forward and reverse reactions compare at a state of dynamic chemical equilibrium?
They are equal.What is Le Châtelier’s principle? Use it to explain why carbonated drinks go flat when their containers are left open.
A system in dynamic equilibrium changes...
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