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


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

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


Question 3. 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%.
170%.
500%.
-10%.


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

5.
6.
4.
7.


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?

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


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