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


Question 2. How many hydrogen atoms are there in the compound C2H5OH?

5.
4.
6.
7.


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 mass of all the carbon atoms in a C3H8 molecule?

24.
24.
48.
36.


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?

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


Question 5. What is one twentieth as a percentage?

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


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