5th Grade STAAR 2017-2018 5.5A

The table lists some physical properties of two objects. Based on their properties, 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 3, because metals conduct thermal energy and electricity

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

Students are investigating properties of objects. They observe four objects and record observations for each object in the table.

Based on the students' observations, which of these tables properly identifies the objects?

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A student measure out 10 mL of four clear liquids and added one drop of a different-colored dye to each liquid. One of the liquids was water. The student then carefully poured each liquid into a graduated cylinder and let the mixture settle for 30 minutes. The student observed that the liquids had separated into layers, as show in the diagram.

Which of these procedures would help the student identify the layer of water?

• Stir the liquids, let them settle, and then identify the bottom layer as water

• Drop a piece of ice into the graduated cylinder, let the ice settle, and then identify the layer just above the ice as water

• Add water to the graduated cylinder, let the mixture settle, and then identify the layer that increases in volume as water

• Carefully pour each layer into separate plastic containers, place the containers in a freezer, and then identify the liquid that takes the longest to freeze as water

A student is 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.

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

• Cardboard

• Aluminum

• Rubber

• Plastic

For an investigation a teacher dropped a bolt into a container of maple syrup and asked students to remove it without touching the syrup. The students first tried to use a strong magnet to remove the bolt, but it remains on the bottom of the container. They finally pouted the syrup into another container to get the bolt out.

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 is more dense than the maple syrup.

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

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