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25 questions
In science, our word for balance is ___
harmony
symmetry
hysteresis
equilibrium
When the balance of some natural system gets disrupted, we say that it's ___
in a hysteresis loop
out of equilibrium
polarized
asymmetric
When reactants react to form products, it's technically called ___
the forward reaction
the reverse reaction
an opposite reaction
combustion
When the products change back into the reactants, we call this ___
a forward reaction
a reverse reaction
a spontaneous reaction
sublimation
When the forward and reverse reactions occur at the same rate, that's called ___
mass balance
two-part harmony
chemical equilibrium
reactant solidarity
Which German chemist developed a process for making ammonia from nitrogen in the air?
Robert Bunsen
Fritz Haber
Otto Hahn
Friedrich Wöhler
An equilibrium is reached when the forward and reverse processes of a reaction happen ____
simultaneously
alternately
at their maximum rates
at the same rate
Because an equilibrium process runs in both directions, and never stops, the equation is written with ___
a double arrow
an infinity symbol
an approximation sign
a zig-zag pointer
We say a change shifts the reaction to the right if it tends to ___
make more reactants form
make more products form
increase the molar concentration
decrease the molar concentration
We say a change shifts the reaction to the left if it tends to ___
make more reactants form
make more products form
decrease the number of moles
increase the number of moles
Which French chemist devised a way to predict the effect of a change in conditions on chemical equilibria?
Pierre Curie
Marie Curie
Louis Pasteur
Henry Louis Le Châtelier
If stress is placed on a system at equilibrium the system will proceed in a direction that ___
minimizes the stress
maximizes the stress
increases the concentration
decreases the concentration
Once the Haber reaction is at equilibrium, if more nitrogen gas is added to the mix the reaction will ___
shift to the left
shift to the right
remain out of balance
stop
Once the Haber reaction is at equilibrium, if some of the ammonia is removed the reaction will ___
shift to the left
shift to the right
remain out of balance
stop
Haber was awarded the 1918 Nobel Prize, but thirty years later he was considered by many to be ___
a national hero
a war criminal
a failed chemist
a tax evader
In the Haber Process, four moles of gas react to form ___
one mole of liquid
two moles of gas
four moles of gas
eight moles of gas
In the Haber process, increasing the pressure will shift the reaction ___
to the left
to the right
to create more moles of gas
to create more nitrogen
In the Haber process, decreasing the pressure will shift the reaction ___
to the left
to the right
to create more ammonia
to create fewer moles of gas
Which type of reactions consume heat?
neutralization reactions
combustion reactions
endothermic reactions
exothermic reactions
Exothermic reactions, which release heat, proceed better at ___
low temperatures
high temperatures
low pressures
high pressures
In the reaction involving cobalt ions, the addition of hydrochloric acid pushes the reaction to ___
the left
the right
the pink side
the dark side
In the reaction involving cobalt ions, the addition of water pushes the reaction to ___
the left
the right
create more water
the blue side
For an endothermic reaction, raising the temperature forces the equilibrium to ___
the left
the right
collapse
stop
For an endothermic reaction, lowering the temperature is like ___
taking away some reactants
adding some reactants
taking away some products
adding pressure
Equilibrium isn't about staying the same all the time, it's just about ___
the Hank process
one bad night at the cheesecake factory
keeping your balance as your circumstances change
eating too many corn dogs
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