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8 Cards in this Set

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grain elevator explosion

idk

Observations that a chemical reaction is taking place

Light


Color Change


Noise


Heat

the rate at which carbohydrates react in the body is much ________ than if they were to react in a grain elevator.



faster / constant / slower

Slower

Consider the following reaction in a closed system:

H2(g) + I2(g) → 2HI(g)


Which of the following will decrease the rate of the forward reaction?




add some H2


remove some HI


increase the volume


increase the temperature

increase the volume
Which of the following increases the average kinetic energy of colliding particles?



adding a catalyst


increasing the temperature


increasing the reactant concentration


increasing the surface area

Surface area

Consider this reaction:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g).


Which combination of factors will affect the rate of the reaction?




temperature, concentration, and surface area


temperature and concentration only


concentration and surface area only


temperature and surface area only

temperature, concentration, and surface area
A student placed 3.0 grams of Mg into some HCl in two different experiments. In each case, it reacted according to the following equation:



Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g).




In the first experiment, it took 32 minutes for all of the Mg to react. In the second experiment, it took 54 minutes for all of the Mg to react. Which of the following could account for the change in reaction rate of the second experiment?




a catalyst was added


the Mg was powdered into H2


the H2 was decreased


the temperature was decreased

the temperature was decreased
Consider this reaction:

3Fe2O3(s) + CO(g) → 2Fe3O4(s) + CO2(g).


Which of the following would increase the rate of the reaction?




adding the Fe3O4


decreasing the temperature


increasing the surface area of Fe2O3


increasing the volume of the reaction vessel

increasing the surface area of Fe2O3