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Big Idea #4 Study Set-Julia Westfall
Terms in this set (30)
Molecular Collision Theory (3 bullets)
tells us that a reaction will only take place if three conditions are met;
1. Reactants come into contact (they collide)
2. The collision occurs with a certain minimum
energy (activation energy)
3. The collision has the correct molecular
Increasing the reactants concentration ----- the rate of reaction. Explain why.
Increasing the reactants concentrations leads to a faster reaction because this puts more reactants into the same space which increases the collision frequency.
A rise in temp will result in a ---- rate of reaction.
A reaction will always be much faster at a higher temperature, because more particles possess the require minimum energy on collision. This makes a greater number of collisions successful in resulting in a reaction.
What three factors increase the frequency of collisions between particles?
rise in concentration of reactants
rise in temperature
increase in pressure
What three factors increase the rate of reaction?
Rise in temp
increase in surface area
addition of a catalyst
What is a half-life?
The time for a reactant to fall to half its original molarity (concentration) value during a reaction.
How does one solve for a half-life?
One would take half life constant found on formula sheet (.693) and divide by that equation's k value
What is a k value in chemistry?
K value is rate constant
What does "order of reaction" refer to when using the integrated rate law?
Order of reaction is a type of classification that will indicate expected behaviors/information about those types of reactions.
What is the concentration of index formula and how is it used?
A formula that relates concentration change to rate change in order to solve for the exponents of your variables within your rate law.
What three categories can elementary steps fall into ?
Unimolecular Bimolecular and trimolecular.
Explain what unimolecular type of reaction is.
Where a single species reacts to form products.
Explain what bimolecular type of reaction is.
two species collide and react to form products
Explain what trimolecular type of reaction is.
three species collide and react to form products.
Do you know how to make a rate law?
if yes; yay
if no; go look in comp book! subscripts are too difficult to type on here.
What does an order of zero mean in a reaction?
Zero order means that the reactants have no affect on the products.
What does the slope of a zero order graph look like?
slope of zero.
straight horizontal line
In which circumstances are natural logs involved?
In situations where the integrated rate law is used.
Quick! What is the order of a reaction with variables that have an index of 1 and 3??
Order of 4
(1 + 3 = 4)
What can the integrated rate law be used for?
Can be used to find initial or final concentrations of substances.
How do you find an equation's order?
Add up the indexes on the variables.
If a substance is present at the beginning of a reaction and present at the end of the reaction, it can be identified as a
True or false:
orders can be fractional
Doubling a reactant doubles the rate is an example of a --- order reaction
Doubling a reactant that quadruples the rate is an example of a ---- order reaction
true or false: intermediates are difficult to classify so it is best just to replace them with known reactants.
What happens if the reactants do not collide with energy less than the activation energy?
Then the reactants do not react! no reaction
How does a catalyst affect the rate of a chemical reaction?
they increase the rate of reaction
What does Beer's law do?
It determines the change in concentration of a colored solution over time.
What does the abbreviation for activation energy look like?
Eact ( little tiny act)
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