L3 Percent Composition
Presentation
•
Science
•
10th Grade
•
Practice Problem
•
Hard
Robin Stubbs
FREE Resource
15 Slides • 11 Questions
1
2
Open Ended
How many moles are in 50.7 grams of CH4?
3
4
5
6
Multiple Choice
What does 'percent composition' mean in the context of chemistry?
The percent by mass of elements in a compound
The percent by volume of a solution
The percent of atoms in a molecule
The percent of compounds in a mixture
7
8
9
Multiple Choice
In the compound NaCl, what is the percent composition of sodium (Na) if the mass of Na is 22.9 and the total mass of NaCl is 58.3?
39.3%
22.9%
58.3%
60.7%
10
11
Fill in the Blanks
Percent composition is calculated as (mass of an element /
Type answer...
12
Multiple Select
Which of the following are needed to calculate the percent composition of a compound?
Mass of each element
Total mass of compound
Volume of compound
Number of atoms of each element
13
Open Ended
Explain how you would calculate the percent composition of an element in a compound, using both simple and complex compounds as examples.
14
15
16
17
18
Multiple Choice
Which Excel sheet tab requires you to use a calculator to input the correct numbers and does not perform calculations for you?
Sucrose
Vanillin
Sodium Bicarbonate
Cacao
19
20
21
Fill in the Blanks
The cells in the Excel sheet will highlight
Type answer...
22
Multiple Choice
Which of the following tabs require you to work out calculations on paper and use the calculator to input the correct numbers?
Sucrose only
Vanillin, Sodium Bicarbonate, and Cacao
All tabs
None of the tabs
23
24
25
Multiple Choice
What is the percent composition by mass of calcium (Ca) in CaC2O4 (Calcium Oxalate)?
31.3%
25.0%
40.0%
18.7%
26
Open Ended
What is one thing you learned today about dimensional analysis or percent composition that you found interesting or useful?
Show answer
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