
SCH4U Reaction Rates
Authored by Jason Broderick
Chemistry
12th Grade
NGSS covered
Used 38+ times

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40 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements about "a reaction rate" is INCORRECT?
the rate of a reaction describes how fast a reaction proceeds over volume of time
a rate of reaction measures how quickly reactants are changed into products.
is the change in concentration of reactants over time or the change in concentration of products over time
Units for reaction rates are in terms of M (mols/L) /time.
None of the other 4 statements are INCORRECT.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
T/F - When expressing reactions rates that following rule is applied. For faster reactions, seconds are used for units of time; for longer reactions, minutes are used.
True
False
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements about "a reaction rate" is INCORRECT?
the rate of a reaction describes how fast a reaction proceeds over time.
reaction rates may be expressed in terms of any chemical species involved in the reaction.
reaction rate can be written for the disappearance of a reactant or the appearance of a product.
Units for reaction rates are in terms of M (mols/L) /time.
None of the other 4 statements are INCORRECT.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When combined hydrochloric acid and zinc metal the acid eats away at the metal to produce hydrogen gas and some dissolved metal salts. The rate of this reaction could be measured in terms of the disappearance of the zinc or the rate of appearance of hydrogen gas.
If we were expressing reaction rate in terms of disappearance of zinc metal, we would write:
Reaction rate = - change[zinc]/time
Reaction rate = change[zinc]/time
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When combined hydrochloric acid and zinc metal the acid eats away at the metal to produce hydrogen gas and some dissolved metal salts. The rate of this reaction could be measured in terms of the disappearance of the zinc or the rate of appearance of hydrogen gas.
If we were expressing reaction rate in terms of disappearance of zinc metal, we could conclude that following
The slope of the line would be negative, because the concentration of our reactant is constantly decreasing.
The slope of the line would be positive, because the concentration of our reactant is constantly decreasing.
The slope of the line would be negative, because the concentration of our reactant is constantly increasing.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
T /F - The random bumping and colliding of molecules with each other generally do not contain enough energy to break these bonds and cause a chemical reaction.
True
False
7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
According to collision theory, in order for a chemical reaction to happen there needs to be an effective collision between the reactants. To be effective, a collision must meet the following two requirements:
Molecules collide with enough energy to break bonds
Molecules collide with a favorable orientation
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