Exploring Material Sorting Techniques

What is a material that allows electricity to pass through it called?

• Insulator

• Conductor

• Magnet

• Polymer

Which of the following is an example of a natural material?

• Plastic

• Nylon

• Wood

• Glass fiber

Which property of a material describes how easily it can be scratched?

• Flexibility

• Hardness

• Transparency

• Conductivity

A teacher places several objects on a table and asks students to sort them by whether they are magnetic or non-magnetic. Which group of materials would all belong to the magnetic category?

• Iron nail, steel spoon, copper wire

• Iron nail, steel spoon, nickel coin

• Aluminum foil, steel spoon, nickel coin

• Plastic ruler, iron nail, rubber band

A student wants to sort a group of materials into those that are good thermal insulators and those that are good thermal conductors. Which pair of materials would be correctly placed in the same group?

• Copper and wood

• Wool and plastic

• Steel and rubber

• Glass and aluminum

A factory needs to sort recyclable materials from non-recyclable ones on a conveyor belt. They use a magnet, a water tank, and a light source. Which sequence of sorting methods would correctly separate iron, plastic, and glass from a mixed pile?

• Use the magnet to remove iron, use the light source to identify glass, use the water tank to separate plastic

• Use the water tank first, then the light source, then the magnet

• Use the magnet to remove iron, use the water tank to separate materials that sink from those that float, use the light source to identify transparent glass

• Use the light source first to identify all materials, then use the magnet for everything else

A student is given five unknown materials and must classify them using only two tests: a magnet test and a water submersion test. Material X is attracted to the magnet and sinks in water. Material Y is not attracted to the magnet and floats in water. Based on this evidence, which conclusion is best supported?

• Material X is plastic and Material Y is iron

• Material X is likely a metal such as iron and Material Y is likely a low-density material such as wood or plastic

• Material X is glass and Material Y is rubber

• Both materials are metals because they were both tested with a magnet

A student claims that all synthetic materials are better insulators than natural materials. Which of the following pieces of evidence best challenges this claim and explains why the student's sorting of materials into "good insulators" and "poor insulators" based solely on whether they are natural or synthetic is flawed?

• Plastic, a synthetic material, is a good insulator, which supports the student's claim

• Copper, a natural material, is an excellent conductor, while wool, also a natural material, is an excellent insulator, showing that natural materials cannot be sorted as a single group based on insulation

• All synthetic materials were made in laboratories, so they must have the same properties

• Natural materials are always better than synthetic materials for all purposes

Which of the following material is lustrous

• Gold

• Plastic

• Wood

• Paper