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. 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.
36.
24.
48.


Question 2. What is one twentieth as a percentage?

15%.
5%.
50%.
10%.


Question 3. A carbon atom has a relative atomic mass of 12 and a hydrogen atom has a relative atomic mass of 1. What's the percentage mass of all the carbon atoms in a CH4 molecule?

75%.
40%.
50%.
60%.


Question 4. Which of these numbers is the only one which could be a correct answer when calculating a percentage on a foundation level GCSE Science paper?

500%.
170%.
64%.
-10%.


Question 5. Which number goes on the bottom of your fraction when you're calculating a percentage on a foundation level GCSE Science paper?

The large number.
The small number.
100%.
The numerator.


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