# 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?

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

Question 2. 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?

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

Question 3. 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 converted into a word equation.
It needs to be balanced.

Question 4. How many hydrogen atoms are there in the compound C2H5OH?

7.
6.
5.
4.

Question 5. Which of the following is a use of calculating percentage mass?

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