Measurement, Units & Experimental Evidence — Drills · Grade 11 Science
Chapter: Investigating MatterWhat these drills covers
By the end of Measurement, Units & Experimental Evidence you should be able to:
- I can convert units, track significant figures, and distinguish precision from accuracy.
- I can interpret a graph or repeated measurements with stated uncertainty.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: density, systematic error, significant figures.
Problem 1
A 42.0 g sample occupies 15.0 mL. Find density.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
2.8 g/mL
42.0/15.0 = 2.80.
Problem 2
Three readings are 2.01, 2.02, 2.01 g/mL but the reference is 2.50. Interpret them.
Answer and explanation
Precise, but inaccurate relative to the reference; investigate calibration or consistent method bias.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.