Grade 8

What is plastic?

• A natural material found in rocks

• A man-made material made from chemicals (usually from petroleum)

• A metal alloy used for machinery

• A type of glass produced from sand

Why is plastic widely used in packaging?

• It is heavy and expensive

• It is lightweight, cheap, and durable

• It melts easily in sunlight

• It decomposes quickly

Name TWO common types of plastic used in packaging.

• Polyethylene (PE) and Polypropylene (PP)

• Iron (Fe) and Copper (Cu)

• Glass and Ceramic

• Nylon and Wool

What does “durable” mean?

• Able to decompose quickly

• It lasts a long time and does not break easily

• Breaks easily under pressure

• It is safe to eat

Give TWO advantages of plastic packaging.

• Lightweight and waterproof

• Fragile and heavy

• Expensive and rare

• Rusts and corrodes

Give ONE more advantage of plastic packaging.

• Protects food from contamination

• Makes food spoil faster

• Always adds a bad taste

• Requires refrigeration

What is flexibility in plastic?

• Ability to bend without breaking

• Ability to conduct electricity

• Resistance to heat

• Capacity to dissolve in water

Name a plastic used for bottles.

• PET (Polyethylene terephthalate)

• PVC (Polyvinyl chloride)

• Wood pulp

• Steel

Why is plastic good for food storage?

• It keeps food fresh and safe

• It adds nutrients to food

• It removes moisture from food

• It flavors food

What does “non-reactive” mean?

• It dissolves in water

• It does not react with food

• It burns easily

• It reacts strongly with acids