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

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


Question 2. 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?

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


Question 3. How many hydrogen atoms are there in the compound C2H5OH?

5.
7.
6.
4.


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?

2.
1.
16.
32.


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 percentage mass of all the carbon atoms in a CH4 molecule?

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


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