🔬 ScienceLevel 1Lesson 21
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Safe Uses of Materials

Lesson preview: the Mini Lesson and Vocabulary are open to everyone. Guided practice, exercises, the parent checklist and the printable PDF worksheet come with full access (free 7-day trial or membership).

What you will learn

  • 1Sort everyday materials into those that are safe to use independently and those that require adult supervision
  • 2Explain why sharp, hot, or chemical materials are hazardous
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Mini Lesson

Scientists use all kinds of materials every day — from crayons and clay to hot liquids and sharp tools. Knowing which materials are safe to handle on your own and which ones need an adult nearby is one of the most important science skills of all.

What makes a material hazardous?

  • Sharp edges — metal scissors, knives, and blades can cut skin. Blunt scissors are safer but still need care.
  • Heat — boiling water, hot pots, ovens, and irons can cause burns. Even a hot glue gun is dangerous for young children.
  • Chemicals — cleaning products, bleach, and some adhesives contain chemicals that can harm skin, eyes, or lungs if touched or breathed in.
  • Electricity — outlets, bare or broken wires, and electrical appliances can give dangerous shocks.
  • Example: A pencil is safe. A craft knife is not — it needs an adult.

Safe to use on your own

  • Crayons, colored pencils, and markers (washable)
  • Child scissors (blunt ended)
  • Glue sticks and white craft glue
  • Clay, playdough, and modeling materials
  • Paper, cardboard, and fabric scraps
  • Wooden blocks and plastic building pieces

Always ask an adult

  • Sharp scissors, craft knives, and metal blades
  • Hot glue guns, irons, and stoves
  • Bleach, cleaning sprays, and solvents
  • Power tools and electrical equipment
  • Glass containers and sharp ceramic pieces

Words to know

Safe

Will not hurt you if used in the right way

e.g. Crayons are safe to use.

Hazardous

Can hurt you and needs an adult to help

e.g. Sharp knives are hazardous.

Sharp

Has a thin edge that can cut

e.g. Sharp scissors can cut paper or skin.

Chemicals

Special liquids or sprays that can harm if touched

e.g. Bleach has strong chemicals.

Supervision

Watching by a grown-up to keep you safe

e.g. I use the stove with adult supervision.

Safe and unsafe ways to use materialsTwo columns compare safe and unsafe uses of the same tools — scissors carried point-down versus held up while running, and a hot pan lifted with an oven mitt versus grabbed with a bare hand.Safe vs Unsafe UsesSafeUnsafetipsdownwalk,don'truntips upwhilerunninghotpanwithmittbarehand
Same material — safe or unsafe depending on how you use it.
Safety rules checklistA safety rules checklist with five items — ask an adult, read the label, wear goggles if needed, keep away from younger children, and wash hands after use.Safety Rules ChecklistAsk an adult before using new toolsCheck the label for warningsWear goggles or gloves if neededKeep tools from little childrenWash hands after using materials
Follow these five rules every time you use materials.
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Ask yourself: "Could this cut me, burn me, or harm me if I touch it? If yes — ask an adult first!"

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