Natural and Synthetic Materials

Fabric can be made with what types of materials?

• Chemical

• Synthetic

• Natural

• All three

Answer explanation

Fabric can be made from both natural materials (like cotton and wool) and synthetic materials (like polyester and nylon). Therefore, the correct answer includes both synthetic and natural materials.

Tags

NGSS.MS-PS1-3

I am a long molecule that is made up of five or more repeating units...what am I?

• Composite

• Synthetic

• Polymer

• Extended structure

Answer explanation

A polymer is a long molecule made up of five or more repeating units, known as monomers. This definition directly matches the description given in the question, making 'polymer' the correct answer.

Composites are synthetic materials that

• can help reduce damage when it is used.

• are made from a mixture.

• are designed for use in some electronic screens.

• are made from a mixture of two or more materials.

Answer explanation

The correct choice is 'are made from a mixture of two or more materials.' This accurately defines composites, which are created by combining different materials to achieve desired properties.

Tags

NGSS.MS-PS1-3

What comes to mind when you think of a natural material?

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

NGSS.MS-ESS3-1

NGSS.MS-LS2-3

Which of the following materials is suitable to make raincoats?

• Cotton

• Plastic

• Silk

• Paper

Answer explanation

Plastic is waterproof and durable, making it ideal for raincoats. In contrast, cotton, silk, and paper absorb water, which would not protect against rain.

Tags

NGSS.MS-ETS1-2

Look at the picture and choose the correct word.

What are they?

• metals

• equipment

• a sieve

• a magnet

Answer explanation

The correct choice is 'metals' because the picture likely depicts various types of metals, which distinguishes them from equipment, a sieve, or a magnet.

Which of the following is NOT a property of thermoplastics?

• They can be recycled.

• They can be remolded and reshaped.

• They cannot be melted.

• They are used in making bottles and containers.

Answer explanation

Thermoplastics can be melted, reshaped, and recycled. The statement 'They cannot be melted' is incorrect, making it the option that is NOT a property of thermoplastics.

Tags

NGSS.MS-PS1-4

Modern non-stick cookware and the flat end of an electric iron has a coating of a polymer. Identify the name of the polymer.

• PVC

• Rayon

• Teflon

• Polyester

Answer explanation

The polymer used in modern non-stick cookware and the flat end of an electric iron is Teflon. Teflon, or polytetrafluoroethylene (PTFE), is known for its non-stick properties, making it ideal for these applications.

Tags

NGSS.MS-PS1-3

Which type of plastic will float in water?

• Thermoset plastics

• Thermoplastic

Answer explanation

Thermoplastics are generally less dense than water, allowing them to float. In contrast, thermoset plastics are typically denser and do not float. Therefore, thermoplastic is the correct choice.

Bridges are made of metal and concrete because those materials are ____________.

• strong

• heavy

• long

• flexible

Answer explanation

Bridges are made of metal and concrete because those materials are strong. Strength is essential for supporting heavy loads and ensuring the safety and durability of the structure, making 'strong' the correct choice.

Tags

NGSS.MS-ETS1-1