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Science

11th Grade

NGSS covered

Used 3+ times

Percent Comp and Empirical Formula Test
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15 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A formula with the lowest whole # ratio of elements in a compound is called

Molecular Formula
Chemical Formula
Empirical Formula 
Distance Formula

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Which of the following is NOT needed to calculate percent composition?

Mass of specific element
Molar Mass
Avogadro's Number
Division

3.

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.

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?

24%
49%
51%
65%

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element has an abundance of 39.03% in the compound sodium phosphate, Na3PO4

Na

P

O

None of the above

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What is the percent composition on Oxygen in NO2? (rounded)

40%
50%
60%
70%

7.

OPEN ENDED QUESTION

2 mins • 1 pt

What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?

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