🔬 ScienceGrade 4Lesson 24
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Conduct safe experiments

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Learning Objectives

  • 1Identify safe and unsafe laboratory practices
  • 2Explain why each safety rule exists in a science lab
  • 3Apply safety procedures before and during experiments
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Mini Lesson

Science experiments help us discover how the world works, but laboratories can be dangerous if we are not careful. Following safety rules protects you and the people around you from harm. Every scientist — from beginners to experts — follows safety procedures every time they work in a lab.

Before You Start

  • Read all instructions carefully before touching any equipment or chemicals.
  • Put on your safety goggles to protect your eyes from splashes and flying particles.
  • Wear a lab coat or apron to protect your clothes and skin.
  • Make sure your workspace is clean and tidy — remove anything that is not needed.
  • Never begin an experiment without a grown-up's permission.

During the Experiment

  • Walk at all times — never run in a science lab.
  • Never taste, smell directly, or touch chemicals unless instructed.
  • Keep flames, heat sources, and flammable materials apart.
  • Never leave a lit flame or heated equipment unattended.
  • If you spill something, tell a grown-up immediately.

After the Experiment

  • Dispose of chemicals and waste materials as directed by a grown-up.
  • Wash your hands thoroughly with soap and water after every experiment.
  • Clean and return all equipment to its correct storage place.
  • Report any broken equipment or accidents to a grown-up.
Lab Safety EquipmentLab Safety EquipmentSafety GogglesProtect eyesLab CoatProtect skin/clothesGlovesProtect handsAlways wear protective equipment before starting.
Safe vs Unsafe Lab BehaviorSafe vs Unsafe BehaviorSAFE (O)OWear gogglesOWalk calmlyORead instructionsOWash hands afterUNSAFE (X)XTaste chemicalsXRun in the labXSkip instructionsXLeave flames aloneEvery scientist follows safety rules.
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Tip: remember the three Ws of lab safety — Wear protective equipment, Watch what you are doing, Wash your hands after.

Vocabulary
safety goggles
Protective glasses worn to shield the eyes from splashes and particles.
lab coat
A protective garment worn in the laboratory to shield skin and clothing.
chemical
A substance used in or produced by chemistry; some can be harmful.
hazard
A source of danger or risk in the laboratory.
procedure
A series of steps followed to carry out an experiment safely and correctly.
contamination
The process of making something impure or unsafe by contact with a harmful substance.
flammable
Easily set on fire; flammable materials must be kept away from flames.
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