Snapquiz - Percentage Mass

Question 1. What is two as a percentage of five?

50%.
60%.
40%.
30%.

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?

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

Question 3. 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 large number.
100%.
The numerator.

Question 4. What needs to be true about a chemical equation before we can calculate percentage mass?

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

Question 5. 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?

16.
32.
1.
2.

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