Review Investigating Matter

Metals can be described as:

• solid

  dull

  scratches easily

  sometimes conducts

  high melting point

• solid

  shiny

  scrathes easily

  good conductor

  high melting point

• solid

  dull

  poor conductor

  low melting point

• gas

  dull

  poor conductor

  scratches easily

Answer explanation

Metals are typically solid, shiny, and good conductors of heat and electricity. They also have high melting points, making the second choice the correct description of metals.

Why does the light turn on in this simple circuit?

• The light turns on because it's Monday.

• The light turns on because the paper clip is a metal, which is a conductor.

• The light turns on because the paper clip is not a conductor.

• The light turns on when the switch is off.

Answer explanation

Metals are good conductors of heat and electricity.

Match the following

• excellent semiconductors

• metalloids

• least resistant to electricty

• metals

• high resistance to the flow of electrity

• nonmetals

Answer explanation

Metals (0) are good conductors, nonmetals (1) are poor conductors and often gaseous, while metalloids (2) have properties of both. Thus, the correct matching is metals: 0, nonmetals: 1, metalloids: 2.

What happens when a non-metal is used in place of the paper clip in the circuit?

• The light turns on because non-metals are good conductors.

• The light remains off because non-metals are poor conductors.

• The light turns on because non-metals have high melting points.

• The light remains off because non-metals are shiny.

Answer explanation

Non-metals are generally poor conductors of electricity, which means they do not allow electric current to flow easily. Therefore, when a non-metal replaces the paper clip in the circuit, the light remains off.

Which of the following is a characteristic of metals?

• They are gases at room temperature.

• They have low melting points.

• They are good conductors of electricity.

• They are dull in appearance.

Why is copper commonly used in electrical wiring?

• Because it is a poor conductor of electricity.

• Because it is a good conductor of electricity.

• Because it is a gas at room temperature.

• Because it has a low melting point.

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Metals make good wires for electrical circuits because they are

• ductile and resist electricity

• ductile and block electricity

• shiny and good conductors

• ductile and good conductors

Answer explanation

Metals have the least resistance to the flow of electricity and make very good conductors. They allow electricity and heat to flow through.

Which are examples of a chemical change?

• burning paper

  rusting metal

  popping fireworks

  baking a pie

• slicing a piece of toast

  breaking a glass bottle

  painting a house

• freezing water

  grating cheese

  chopping wood

• cutting hair

  coloring a picture

  breaking a toothpick

Answer explanation

City Girls Like Their Orange Pants Because Rockets Rule!

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Evidence of a chemical change:

• Melting of ice
• Dissolving sugar in water
• Breaking a glass
• Color change, gas production, formation of a precipitate, temperature change, or change in odor.

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Which two show a physical change?

• Burning wood
• Melting ice
• Frying chicken

• Freezing water

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