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Science · Grade 10

Chemical Measurement, Safety and Models

The opening chemistry unit builds the habits every later course depends on: reading hazard information and planning safe work, using SI units and scientific notation, recording measurements with honest precision and significant figures, calculating density with dimensional analysis, and judging what a chemical model shows and leaves out.

  • 5 lessons
  • About 110 minutes
  • Measurement, safety and models check: 10 questions
  • Ways to answer: fill in the blanks, choose an answer, draw a graph, match pairs, type a number and put in order
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What learners will discover

  • Interpret hazard pictograms and safety data, choose protective equipment and procedures, and sequence a safe response to a spill.
  • Use SI base units, metric prefixes and scientific notation to express and convert measurements.
  • Record measurements to the precision of the instrument, count significant figures, round calculated results correctly and distinguish accuracy from precision.
  • Calculate and apply density using dimensional analysis, and use density to identify a substance.
  • Compare chemical models (particle diagrams, ball-and-stick, space-filling, formulas) and explain what each shows and omits.

Lessons

  1. Safety as risk reasoning 7 steps4 practiceabout 22 min
  2. SI units, prefixes and scientific notation 6 steps4 practiceabout 20 min
  3. Precision, significant figures and accuracy 6 steps4 practiceabout 24 min
  4. Density and dimensional analysis 7 steps4 practiceabout 24 min
  5. Models: what they show and what they hide 5 steps2 practiceabout 20 min
  6. Measurement, safety and models check 10 questions at the end

Keep exploring

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Guide for grown-ups