Questions and Answers
What are properties of materials?
Characteristics of an object or material.
What does the property of ductility allow a material to do?
Be drawn out into a wire.
What is the purpose of a conductor?
To allow electricity and heat to flow through it.
What is an advantage of a plastic bag being durable?
Signup and view all the answers
Why do plastic shopping bags need to be strong?
Signup and view all the answers
What happens to the temperature of two objects when heat is transferred from one to another?
Signup and view all the answers
What is the term for the process by which a solid turns into a liquid?
Signup and view all the answers
What is the temperature at which water boils, depending on factors such as altitude and atmospheric pressure?
Signup and view all the answers
What is the main reason why plastic bags are a problem for the environment?
Signup and view all the answers
What is the primary concern regarding the manufacturing of materials like paper and plastics?
Signup and view all the answers
What is a major consequence of harvesting trees to make pulp and paper?
Signup and view all the answers
What is a common environmental issue associated with fossil fuels?
Signup and view all the answers
What is a major environmental concern related to mining metals?
Signup and view all the answers
What is a characteristic of plastic bags that makes them a major environmental concern?
Signup and view all the answers
What is a solution to reducing the environmental impact of plastics?
Signup and view all the answers
Study Notes
Properties of Materials
- Properties are distinctive characteristics that describe an object or material.
- Examples of properties of a metal:
- Durable (long-lasting)
- Malleable (can be formed into plates)
- Ductile (can be drawn out into a wire)
- A conductor is a material that allows heat and electricity to flow through it. Metals are good conductors.
Advantages and Disadvantages
- Advantages are desirable properties of materials.
- Disadvantages are undesirable properties of materials.
- Consider a plastic bag:
- Advantageous properties:
- Strong (to hold items)
- Durable (to be reused)
- Disadvantageous properties:
- Takes years to break down, causing pollution
- Can harm animals (entanglement, death)
- Advantageous properties:
Heat and Temperature
- Heat is the transfer of energy from one object to another due to a temperature difference.
- Temperature is a measure of how hot or cold something is.
- Adding heat energy usually results in a temperature rise.
- Melting point is the temperature at which a solid turns into a liquid.
- Boiling point is the temperature at which a liquid changes into a gas.
- Examples:
- Water boils at 100°C (100 degrees Celsius)
- Wax melts at a certain temperature (its melting point)
Impact on the Environment
- Using materials like plastics and paper can have a negative impact on the environment.
- Manufacturing processes can also harm the environment, e.g.:
- Paper production: deforestation, destruction of habitats, water usage
- Environmental issues:
- 10 examples of 21st-century environmental issues (e.g. deforestation, air pollution)
Environmental Impact of Fuels, Mining Metals, and Plastics
- Environmental impact of fuels:
- Mining: concerns about mining metals apply to fuels
- Use: contributes to air pollution, oil spills, harm to animals
- Environmental impact of mining metals:
- Chemicals used can cause water pollution
- Dust can harm human health
- Air pollution causes global warming
- Soil fertility is prohibited
- Disrupts natural habitats
- Environmental impact of plastics:
- Contributes to decline of non-renewable resources
- Causes pollution (air, ground, water)
- Blocks drains, causing flooding
- Affects animal and human health
- Non-biodegradable, poisonous, takes 1000 years to break down
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
