Questions and Answers
Useful materials can have properties such as durability and flexibility.
True
Recycling harmful materials is not possible and should be avoided.
False
Toxic substances found in common materials can pose health hazards when mishandled.
True
Broken glass jars are considered useful materials without any hazards.
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All materials used in schools are safe and have no environmental impacts.
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Old newspapers can be reused and repurposed, making them useful materials.
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Materials with properties like elasticity and hardness cannot be recycled.
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Using materials improperly can cause harm to health and the environment.
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Chalk can be harmful if its dust is inhaled.
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Durability and flexibility are properties that may make materials useless.
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Most useful materials can be reused and recycled.
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Plastic and glass bottles can only be recycled into new bottles.
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A frying pan is typically considered a harmful material.
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Mosquito repellant can be considered a harmful material due to its chemical components.
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Materials are evaluated as useful based on their ability to serve their intended purpose.
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Recycling materials has no positive environmental effects.
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Useful materials are recognized by their properties such as flexibility and hardness.
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Recycling involves transforming harmful materials into new products.
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All materials, regardless of their properties, are safe to handle without precautions.
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A broken glass jar is a useful material because it can be safely stored away.
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Materials like candy wrappers can be recycled into creative products like curtains.
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Health hazards from materials can arise from substances like paints and cleaning agents.
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The property of durability makes materials less likely to be useful over time.
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Toxic fumes from certain materials pose no environmental threat when disposed of improperly.
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Study Notes
Recognizing Useful and Harmful Materials
- Materials are considered useful when they fulfill their intended purpose.
- Properties that define usefulness include durability, flexibility, elasticity, hardness, and resistance to water, heat, or acid.
- Many useful materials can be recycled or reused; for example, empty containers can serve new purposes, such as vases or decorative items.
Recycling and Reuse
- Useful materials allow for recycling into new products (e.g., candy wrappers transformed into curtains, plastic bottles into lanterns).
- Items like broken glass can cause injuries; hence, safe handling is crucial.
Sources of Harm
- Harmful materials can include toxic substances present in everyday items like paints, cleaners, or powders.
- Improper use of materials can pose risks to health, the environment, and other living organisms.
- Awareness and caution are essential when managing both useful and harmful materials.
Examples of Materials
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Useful Materials:
- Chalk: Useful for writing but can be harmful due to inhaled dust, especially for individuals with asthma.
- Plastic/glass bottles: Reusable after they are emptied.
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Harmful Materials:
- Drained batteries and shattered glass pose health hazards.
Practical Activities
- Drawing and identifying materials that may be useful yet harmful (e.g., based on daily usage at school).
- Classifying materials found at home or school into categories of usefulness and hazard, fostering recognition skills.
Differentiate Properties
- Understand the difference between physical and chemical properties to better assess materials' potential impact and utility.
Caution and Care
- Emphasize careful handling techniques to mitigate risks associated with potentially harmful materials.
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Description
This quiz explores the concepts of useful and harmful materials. You will learn about the properties that make materials valuable and how to identify hazardous substances. Additionally, discover the importance of recycling and safe handling practices.
