$$$ Quiz $$$ Reaction Rates and Equilibrium. What are the units for a reaction rate? M/s, molarity...
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Transcript of $$$ Quiz $$$ Reaction Rates and Equilibrium. What are the units for a reaction rate? M/s, molarity...
$$$ Quiz $$$
Reaction Rates and Equilibrium
What are the units for a reaction rate?
M/s, molarity per second, concentration
per second
What is the highest energy stage of a reaction called?
transition stateor
activated complex
How does a catalyst speed up a reaction?
Lowers activation energy barrier
When reacting molecules collide with each other, do they always form a reaction?
No, improper orientation,
not enough KE
What is a calorie or joule?
Unit of heat (q)
What are the four factors we discussed that affect the rate of reaction?
Temperature, concentration, particle size, and use of catalyst
What does an inhibitor do?
Interferes with the action of a catalyst
At equilibrium, what can you say about reactants and
products?
The rates of production of both are equal.
What does the double arrow mean in chemistry?
There is a forward and reverse reaction
“If a stress is applied to a system in dynamic equilibrium, the system
changes in a way that relieves the stress”, is known as _________.
Le Chatelier’s Principle
According to Le Chatelier’s Principle, if you remove products from a reaction
at equilibrium, what will happen to the reactants?
The reactants will react more to offset the loss of products, thus
becoming lower themselves
True or False. If you have more gas molecules on the left-side of a
reaction, and you increase the pressure, the equilibrium will shift
to the right.
True
True or False. If Keq = 1 x 10-5, then products are favored.
False
Solve the Keq expression for the following reaction.
Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g)
Keq = [MgCl2][H2]/[HCl]2
Write an expression for the solubility product constant, Ksp, for
the following dissolving process.
NaCl(s) Na+(aq) + Cl-(aq)
Ksp = [Na+][Cl-]
What is the equation for Gibb’s Free Energy?
G = H-TS
What is S and what does it measure?
Entropy, it measures disorderIn a system
What is H and what does it measure?
Enthalpy, it measures the heat in a reaction
If the heat of a reaction, H, is -56.7 kJ, what can
you say about the reaction?
Exothermic, gives off heat when reactants are combined
If you take a solid and liquid, and mix them to produce a gas, what can you
say about the reaction in terms of “chaos theory”?
S is positiveEntropy obviously increased
What can you say about a reaction that has +G?
Nonspontaneous
What three variables can tell you whether a reaction will occur on its own or need outside help?
Enthalpy, HEntropy, STemperature of system
If the H of a reaction is positive then the reaction is _______ .
endothermic
What is the enthalpy change in a chemical reaction known as?
Heat of reaction, H
Can you do the following?
-Write out a Keq expression when given a random reaction
-Then plug in given concentration values to actually calculate Keq.
- Then interpret what the Keq value actually means?
Can you do the following?
-If you are given Ksp, can you calculate individual ion
concentrations?