Synthetic materials from natural resources

边玩边学

回答这些题目来赚取能量，然后钓鱼探索。无需账号。

给老师：面向 Synthetic materials from natural resources（NGSS Middle School Science，Chemistry）的即用型课程幻灯片, 复习笔记——用在你的课堂上，或将该知识点作为学生可实时游玩的互动课堂活动来运行。

课程笔记

Natural vs. Synthetic Materials

Natural materials come from nature or are made from something that occurs in nature.
Synthetic materials are made by mankind, often in a science lab.
A synthetic material with the same chemical structure as a natural one has the same properties.
Example: lab-created diamonds and mined diamonds are both made of carbon and have identical properties.
Synthetic insulin is chemically identical to natural insulin and functions the same in the body.
The only difference between natural and synthetic materials is the process used to make them.

Labels for cotton and merino wool, a sheep, yarn, and a wool sweater

Synthetic Materials from Natural Resources

Synthetic materials are derived from natural resources.
Example: plastic is mainly made from petroleum (oil), a natural resource.
Nylon and polyester are synthetic fabrics made from petroleum products.
Medicine from the Foxglove flower is a synthetic material made from a natural resource.
Synthetic materials can have new properties that change their function and uses.

A bottle of medicine capsules and the foxglove flower (Digitalis purpurea)

Properties and Uses of Synthetic Materials

Materials have properties like strength, flexibility, melting/boiling points, and conductivity.
Heat conductivity is how well a material conducts heat; electrical conductivity is how well it conducts electricity.
Synthetic fabrics are often lighter, water-resistant, and more durable than natural ones.
Nylon is strong and lightweight, used in ropes, fishing nets, tents, utensils, and parachutes.
Properties determine the function and use of a material.

Environmental Impact of Material Production

Every process to produce materials has an impact on the environment; some are small, others large.
Mining for metals and coal has devastating effects, including large holes and slag piles (crushed rock waste).
Coal mining and use in power stations have negative environmental impacts.
Paper making requires huge areas of land for tree plantations and factories cause pollution.
Plastics take a long time to decompose and can become hazards to organisms.
Fracking (injecting water at high pressure to release gas/oil) is a major environmental concern.

A tree plantation for paper and a paper-making factory

幻灯片

Step through every slide for this topic — plus flashcards and revision notes — with a free account.

练习题

免费预览——36 题中的 8 题。注册即可查看全部。

1.A synthetic material is always made from natural resources.
Easy
True or false?
2.Natural resources are materials that have been made by humans in a laboratory.
Easy
True or false?
3.Synthetic insulin has the same chemical structure as natural insulin.
Easy
True or false?
4.Plastic is made from a natural resource called petroleum.
Easy
True or false?
5.Synthetic materials always have different properties than the natural resources they come from.
Easy
True or false?
6.All synthetic materials are made from petroleum.
Easy
True or false?
7.Nylon is a natural fiber produced by silkworms.
Easy
True or false?
8.The medicine made from the foxglove flower is an example of a synthetic material made from a natural resource.
Easy
True or false?

复习笔记

## Synthetic Materials from Natural Resources ### Key Idea Synthetic materials (like plastics, medicines, and fuels) are **made from natural resources** by changing their structure through processing. The **processing–structure–properties–performance** paradigm explains how we design materials for specific uses. ### How It Works - **Natural resources** (e.g., crude oil, plants, minerals) are raw materials. - **Processing** (e.g., heating, mixing, chemical reactions) changes the **structure** of the material at atomic/molecular levels. - **Structure** determines **properties** (e.g., strength, flexibility, conductivity). - **Properties** control **performance** in real-world applications. ### Examples - **Plastics**: Made from petroleum (natural resource) through polymerization. Properties: lightweight, moldable, durable. Used in bottles, bags, toys. - **Medicines**: Many drugs are synthesized from plant compounds or other natural sources. Processing refines and modifies molecules for medical effects. - **Fuels**: Gasoline and diesel are refined from crude oil. Biodiesel comes from plant oils. ### Impacts on Society & Environment - **Benefits**: New materials improve life (e.g., medical implants, lightweight cars save fuel). - **Challenges**: Processing can cause pollution, use energy, and deplete resources. Some synthetic materials (like plastics) create waste that doesn't decompose easily. - **Responsibility**: Engineers and scientists aim to design materials that are effective and sustainable. ### Key Concepts - **Materials science**: Study of how structure affects properties, and how to design materials. - **Three main classes**: Metals, ceramics, polymers. Synthetic materials often fall into polymers (plastics) or composites. - **Structure matters**: Atomic arrangement and microscopic features determine behavior (e.g., diamond vs. graphite both are carbon but different structures give different hardness). ### Remember - Synthetic ≠ artificial in a bad way; it means human-made from natural starting materials. - The same natural resource can yield many different synthetic materials depending on processing. - Always consider both benefits and environmental costs.

Synthetic material: A material made by humans from natural resources through chemical or physical processing, e.g., plastic from petroleum.
Natural resource: Raw material obtained from nature (e.g., crude oil, wood, minerals) used to make synthetic materials.
Processing–structure–properties–performance paradigm: A framework in materials science: processing changes structure, structure determines properties, and properties control performance in use.
Polymer: A large molecule made of repeating subunits; many synthetic materials (e.g., plastics) are polymers.
Materials science: The study of how the structure of a material relates to its properties, and how to design materials for specific applications.

闪卡

What is a synthetic material?

A synthetic material is a human-made substance created by chemically changing natural resources. Examples include plastics, medicines, and fuels.

Give three examples of synthetic materials mentioned in the standard.

Plastics, medicines, and fuels.

What is the source of synthetic materials?

Synthetic materials are made from natural resources, such as oil, plants, or minerals, through chemical processing.

How does processing affect the structure of a material?

Processing determines the internal structure of a material, including atomic arrangements and microscopic features, which in turn influence its properties.

What is the processing–structure–properties–performance paradigm?

It describes how processing determines structure, structure determines properties, and properties control the performance of a material in service.

Why is materials science considered interdisciplinary?

It combines elements of chemistry, physics, and engineering to understand the relationships between a material's structure, properties, and performance.

What are the three main classes of materials?

Ceramics, metals, and polymers.

Give an example of a synthetic polymer and its natural resource.

Plastic (polymer) is often made from petroleum, a natural resource.

How can the production of synthetic materials impact society?

It can provide useful products like medicines and fuels, but may also cause pollution or resource depletion.

How can the production of synthetic materials impact the environment?

Processing natural resources can release pollutants, consume energy, and generate waste, affecting ecosystems and climate.

What is a natural resource?

A natural resource is a material found in nature, such as oil, wood, or minerals, that can be used to make synthetic materials.

What does MS-PS1-3 standard require students to understand?

Students should understand how synthetic materials are made from natural resources and the impacts of their processing on society and the environment.

What is the role of chemistry in making synthetic materials?

Chemistry is used to change the molecular structure of natural resources to create new materials with desired properties.

Why are synthetic materials important?

They provide many useful products that improve daily life, such as plastics, medicines, and fuels, but their production must be managed responsibly.

What is the difference between a natural material and a synthetic material?

A natural material occurs in nature, while a synthetic material is human-made by chemically altering natural resources.

How does the structure of a material affect its properties?

The internal structure, from atomic arrangement to microscopic features, determines mechanical, electrical, thermal, and optical properties.

What is an example of a synthetic medicine made from a natural resource?

Aspirin is a synthetic drug originally derived from willow bark, a natural resource.

What is the significance of the Space Race in materials science?

It drove the development of metallic alloys, silica, and carbon materials used in space vehicles, advancing synthetic materials.

What are nanomaterials?

Nanomaterials are advanced materials with structures at the nanoscale, often synthetic, with unique properties.

How do computer simulations help in materials science?

They are used to find new materials, predict properties, and understand phenomena, aiding the design of synthetic materials.

What is the definition of a material in materials science?

A material is a substance (usually solid) intended for certain applications, and it can be natural or synthetic.

What are biomaterials?

Biomaterials are materials designed to interact with biological systems, often synthetic, used in medical implants or devices.

Why is it important to consider the full life cycle of a synthetic material?

Because the extraction, processing, use, and disposal of synthetic materials have environmental and social impacts that must be evaluated.

What is a polymer?

A polymer is a large molecule made of repeating subunits, many synthetic polymers are plastics.

Unlock all 36 questions, flashcards & more

创建免费账号，即可查看该知识点的每一道题、幻灯片、闪卡和复习笔记。

历年真题

该知识点的历年真题练习即将推出。

即将推出