Snapquiz - Percentage Mass

This is the Snapquiz on Percentage Mass. Click here or use the embedded video if you haven't watched the lesson yet.


Question 1. What needs to be true about a chemical equation before we can calculate percentage mass?

It needs to be reversible.
It needs to be labelled.
It needs to be balanced.
It needs to be converted into a word equation.


Question 2. Which of the following is a use of calculating percentage mass?

Using experimental data to tell two compounds apart from each other.
Using experimental data to calculate the chemical formula of a compound.
Using experimental data to find which elements are in a compound.
Using experimental data to predict which compounds we'll produce.


Question 3. What is two as a percentage of five?

30%.
50%.
40%.
60%.


Question 4. A hydrogen atom has a relative atomic mass of 1 and an oxygen atom has a relative atomic mass of 16. What's the mass of all the oxygen atoms in an H2O molecule?

32.
1.
16.
2.


Question 5. A carbon atom has a relative atomic mass of 12 and a hydrogen atom has a relative atomic mass of 1. What's the mass of all the carbon atoms in a C3H8 molecule?

24.
24.
48.
36.


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