DCP#1 Review

What do the following items have in common?

aluminum foil, brass key, gold ring

• They are all good insulators of thermal energy.

• They are all good conductors of electrical energy.

• They are all soluble in water.

• They are all attracted by magnets.

Students at Tisinger are testing the solubility of solids. Their observations are listed below. Which observation describes the solid dissolving in the water?

• Particles settled to the bottom of the beaker.

• Collected on beaker walls above liquid.

• Clear; no visible particles.

• Formed a layer on top of the water.

Keyshuna takes notes on the physical properties of two objects. Based on the properties listed, which of the objects is most likely a metal?

• Object 1, because it is a solid that is less dense than water.

• Object 2, because all metals float in water.

• Object 2, because metals conduct thermal energy and electricity.

• Object 1, because it can be used to provide insulation for thermal energy.

Mrs. McCarty's students are asked to design a sleeve for a cup that will insulate thermal energy and not feel hot to the touch when the cup is filled with hot liquid.

Kaleb has four materials to choose from. Which of these materials is least useful as an insulator?

• Cardboard

• Aluminum

• Rubber

• Plastic

Elijah is observing a beaker containing maple syrup and a bolt. Mrs. McCarty asks him to remove the bolt without touching the syrup. He tried to use a strong magnet to remove the bolt, but it remained on the bottom of the container.

Which of these best describes some of the bolt's physical properties?

• The bolt is magnetic and has the same density as the maple syrup.

• The bolt is nonmagnetic and more dense than the maple syrup.

• The bolt is nonmagnetic and less dense than the maple syrup.

• The bolt is magnetic and less dense than the maple syrup.

Two wires carrying electricity can create a spark if they come too close together. This spark can start a fire. Wires carrying electricity are usually covered with plastic to keep them from starting a fire. Why does the plastic keep the electricity from starting a fire?

• Plastic is a good insulator.

• Plastic can melt when heated.

• Plastic is softer than wire.

• Plastic conducts electricity.

Which two objects are less dense than water?

• wood block and metal paper clip

• plastic ball and glass marble

• metal paper clip and glass marble

• wood block and plastic ball

Which of these are NOT soluble in water?

• oil

• salt

• honey

• sugar

Mr. Bordones' science class tested three properties of different materials. The Results are shown in the table below.

Based on the table, which material would be best to use to insulate electrical wires?

• wood

• plastic

• copper

• steel

Braelyn wears protective gloves to lift a metal pan filled with boiling water from a hot plate. Why are the protective gloves necessary?

• The metal pan creates thermal energy.

• The metal pan insulates thermal energy.

• The metal pan conducts thermal energy.

• The metal pan reduces thermal energy.