Back to Separate Sciences (Biology, Chemistry, Physics)Practice this
Paper 1
Quantitative Chemistry
Both
Always convert units first: cm³ to dm³ by ÷1000.
Key Facts
- Percentage yield is less than 100 percent due to losses.
- Atom economy measures how much product is useful.
Key Equations
moles = mass / Mr
concentration = moles / volume
percentage yield = actual / theoretical x 100
Topics Covered
Moles and Formula Mass
What you need to know
- •Use Mr from the periodic table to calculate moles.
- •Balance equations before using ratios.
Exam Tips
- Show all unit conversions clearly.
Solutions
What you need to know
- •Concentration is in mol/dm^3.
- •Convert cm^3 to dm^3 by dividing by 1000.
Exam Tips
- Always write units in the final line.
Key Terms
Mole
The amount of substance containing 6.02 x 10^23 particles.
Mr
Relative formula mass from the periodic table.
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Common Exam Questions
Calculate the concentration of 0.2 mol in 0.5 dm^3.
2 markseasyPaper 1
Model Answer
0.4 mol/dm^3
What examiners want to see
- ✓Use concentration = moles / volume.
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