PBT. 1.2 - Useful and Harmful Materials

Which of the following materials can be considered as harmful?

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What kind of substances can be found in most appliances and cars that may harm the Earth by contributing to global warming?

• Chlorofluorocarbon

• Chlorinefluorocarbon

• Chlorofluorinecarbon

• Chlorofluorocarbonine

Bleach can be corrosive but _____ can be an alternative for this.

• baking powder

• chlorine

• vinegar

• lemon juice

Ioannis found a lot of ants marching around their pantry. He wants these ants to back off but without the use of any insecticide. Which of the following alternative materials can you suggest?

• Baking powder

• Soy sauce

• Salt

• Lemon Juice

All of the materials below are considered as "desirable materials" EXCEPT _________.

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Materials are generally ______ but they can be harmful depending on the use and situation.

______ can be found in paints and gasoline which can be toxic to humans.

_____ materials are those that serve more than its purpose. It can be classified into vital, essential, and desirable materials.

Old thermometers have _____ inside them which is very dangerous when inhaled or ingested.

One alternative material that can remove bad odors in a small area is __________. It can also be used to whiten some parts of our body.