
Rate Expressions
Authored by Charles Martinez
Science
3rd Grade
NGSS covered

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
[SAMPLE question] Chemical reactions may be classified based on their reaction rate expressions
True
False
Answer explanation
True
Today we're going to know that there are different types of chemical reactions according to their reaction rate expressions
Tags
NGSS.HS-PS1-5
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
[BLIND question] Which are the components of a reaction rate expression?
rate constant (k) + function of concentrations f(CA)
function of concentrations f(CA) + reaction temperature (T)
rate constant (k) + reaction temperature (T)
reaction time (t) + reaction temperature (T)
Answer explanation
A reaction rate is usually expressed as follows:
-rA = k * f(CA)
Tags
NGSS.HS-PS1-5
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
[REINFORCEMENT question] According to the previous definition of a reaction rate expression -rA = k f(CA) which of the following could be an example?
-rA = CA2/T
-rA = kT
-rA = k CA
-rA = T/t
Answer explanation
In this case:
k = k
f(CA) = CA
Therefore:
-rA = k f(CA) = k CA
Tags
NGSS.HS-PS1-5
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
[BLIND question] Several chemical reactions follow a power-law model like
f(CA) = CA^α
where α is a number (0, 1, 2...)
Which of the following expressions doesn't follow that model?
-rA = kCA
-rA = k
-rA = kCA2
-rA = kT3
Answer explanation
-rA = k is valid when α = 0
-rA = kT3 doesn't represent a reaction rate expression
Tags
NGSS.HS-PS1-5
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
[REINFORCEMENT question] According to the power law, a second order reaction (α = 2) could be expressed as:
-rA = kCA2
-rA = kCA
-rA = kCA1/2
-rA = k
Answer explanation
-rA = kCA^α
If: α = 2
-rA = k CA2
Tags
NGSS.HS-PS1-5
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