2023 Corrosive,Flammable,explosive,toxic.pptx

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1. GRADE FIVE Teacher Annalyn D. Pangan Science Teacher

2. USEFUL and HARMFUL MATERIALS A material’s properties can help you determine if the object is useful or harmful. Knowing about these properties can help you handle the material correctly. Useful Materials Among the materials that are very useful to people are metals, plastics, wood and textiles.

3. Harmful Materials Some materials that people use everyday can be harmful when they are used improperly. Some materials can cause injuries . Others can be corrosive , flammable or explosive , poisonous, or reactive.

4. Corrosive materials can damage or destroy the outer layer of other materials . Muriatic acid is a corrosive material that is very useful in removing stains from tiles. However, when applied on metals, it corrodes the metal. It could easily burn a person’s skin.

5. Corrosive Materials- ex. Oven cleaners, drain cleaners, toilet bowl cleaners and auto batteries, bleach

6. Flammable materials can easily catch fire when exposed to heat. Explosive materials are those substances that contain a lot of energy. Poisonous or toxic materials can cause sickness or death when they are swallowed, inhaled, or absorbed through the skin.

7. Reactive materials cause a chemical reaction when they are mixed with other substances. Reading product labels can help you identify whether the product is useful or harmful. These simple symbols in labels give ideas on how to use and store the product properly, and to help prevent accidents from happening and therefore save lives.

8. Flammable Materials- ex. gasoline, acetone, alcohols, LPG, paints, varnishes and lacquers

9. Explosive Materials- ex. fertilizer, gunpowder, and hydrogen peroxide

10. Poisonous or Toxic Materials- ex. medicines, detergents, cleaning products, toiletries, garden chemicals, pesticides, fuel oil and cosmetics

11. Evaluation: Directions: Write True if the statement is correct, and write False if it is incorrect. 1. Consumers must read product labels when buying grocery items. 2. Place fertilizers in containers and label them as poisonous.

12. 3. Throw away anywhere the plastic bottles after using them. 4. Labels are not important in classifying materials as to useful or harmful. 5. Food allergen warnings are helpful especially for those who have allergies.