Unit 2 Science Test Remediation

#3

• 1 Substance

• 2 Substances

• 3 Substances

• 4 Substances

#9

• 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

#13

• 
• 
• 
• 

#14

• Material 1 is a rubber ball. Material 2 is a piece of cardboard.

• Material 2 is an aluminum washer. Material 3 is a copper wire

• Material 3 is a piece of cardboard. Material 4 is an aluminum washer.

• Material 1 is a copper wire. Material 4 is a rubber ball.

#6 A student prepared a snack that consisted of grapes, pecans, and strawberries sprinkled with white powdered sugar. The student stored the snack in a refrigerator. An hour later the student observed that the powdered sugar could no longer be seen but the fruit and nuts had not changed in appearance.  What most likely happened to the sugar in the mixture?

• The sugar evaporated at the lower temperature in the refrigerator without causing any changes to the fruit and nuts.

• The sugar was more dense than the other foods in the mixture, so it settled to the bottom of the container

• The sugar dissolved in the moisture on the fruit. 

• The sugar absorbed energy from the nuts and melted into a colorless liquid.

#4 Students observe a glass of ice and water. The glass is dry on the outside. After ten minutes students see drops of water on the outside of the glass.  Which statement best explains the students' observations?

• The water vapor in the air changes to a liquid when it touches the cold glass.

• The cold water inside the glass rises and then slides down the outside of the glass.

• The ice in the glass melted and caused the water to overow the glass.

• The water moved to the outside surface through tiny holes in the glass.