Properties of Matter Unit Test Review

In 3–5 sentences, explain why electrical wires are often constructed from metal coated with rubber, and how that is similar to metal pans having rubber or plastic handles. (You are not to copy and paste this into the test!)

• Metals, such as copper, are good electrical conductors. They are also good thermal conductors. 

  Rubber and plastic are both electrical and thermal insulators.

  Wires are constructed so that their core conducts electricity, but are coated with an insulator so that a person can touch the wire and be insulated from the electricity. This makes wires safer to handle.

  Pans are constructed so that the area where food is cooking gets hot, but the handles are coated so a person can touch the handle and be insulated from the heat. This makes pots and pans safer to handle.

• Metals, such as copper are not good electrical conductors. They are also not good thermal conductors. However, rubber and plastic are both good conductors. Wires are constructed so that their core does not conduct electricity, but are coated with an conductor that makes the wires safer. Pans are coated with a material to conduct heat, which make it safer to handle.

Tags

NGSS.MS-ETS1-3

In which state of matter are the particles least tightly arranged?

Responses

• The particles are arranged the same in all states of matter. 

• Gas

• Liquid

• Solid

Which of the following best describes the arrangement of particles in a gas?

Responses

• The particles are packed closely together and cannot move freely. 

• The particles are spread apart and can move freely. 

• The particles are packed closely together and can move freely

• The particles are spread apart and cannot move freely. 

Which best defines color?

• a physical property of matter related to a material’s ability to reflect light

• a chemical property of matter related to a material’s ability to reflect light

• a physical property of matter related to how a material interacts with different wavelengths of light

• a chemical property of matter related to how a material interacts with different wavelengths of light

Which of the following materials is a good electrical conductor?

• ceramic

• copper

• rubber

• plastic

What is the melting point of a substance?

• the temperature at which the solid state turns into a liquid state

• the temperature at which a gas will completely boil away

• the temperature at which a liquid melts

• the temperature at which the liquid state boils to a gaseous state

Which of the following are solvents?

• table salt and sand

• sand and fresh water

• fresh water and rain

• rain water and a tea bag