Rate Expressions

Rate Expressions

3rd Grade

5 Qs

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Rate Expressions

Rate Expressions

Assessment

Quiz

Science

3rd Grade

Practice Problem

Hard

NGSS
HS-PS1-5

Standards-aligned

Created by

Charles Martinez

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5 questions

Show all answers

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

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

If: α = 2

-rA = k CA2

Tags

NGSS.HS-PS1-5