Empirical Formulas

Empirical Formulas

10th - 12th Grade

8 Qs

quiz-placeholder

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Empirical Formulas

Empirical Formulas

Assessment

Quiz

Chemistry

10th - 12th Grade

Practice Problem

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Created by

Cindy Faulk

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8 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

NO
N2O3
N2O4
N2O5

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An empirical formula:

is a formula that calculates the coefficients of a compound in a balanced equation.
is the simplest whole-number ratio of moles of elements in the compound.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What do you do when you get a half in the ratio?

add 2 to each element
add two to only the one with the half
multiply the one with the half only by two
multiply all of them by two
add two to all of the ratios

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

Cu3O8
CuO4
Cu2O
Cu4O10

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the empirical formula of the following molecular formula:  C3H6

C3H6
CH2
C2H4
CH3

6.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which one is empirical?

H2O2
C2H6O12
CaCl2
N2O8

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the empirical formula for a compound containing the following ratio:
3Na:1P:4O

NaPO4
Na3P4O
Na3PO4
NaPO

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