September 18th DOL

A group of students compared the physical properties of two objects. The results are shown in the table below.

Object A	Object B
4 grams	7 grams
More dense than water	Less dense than water
nonmagnetic	nonmagnetic

Based on the table, which conclusion about Objects A and B can be made?

• Objects A and B are both magnetic and have the same mass.

• Objects A and B have different masses and sink in water.

• Object A and B have the same mass, but Object B floats.

• Objects A and B have different masses, and neither are magnetic.

A class was studying how temperature changes affect states of matter. One student placed an ice cube with a mass of 35 grams in a beaker and placed it in a warm room. After the ice cube melted and became liquid, the student put the beaker of water in the freezer. What was the mass of the ice cube after it became solid again in the freezer?

• The mass decreased to 0 grams.

• The mass remained at 35 grams.

• The mass decreased to 22 grams.

• The mass increased to 45 grams.

Students are investigating the 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?

• A. K: Oil, L: Iron needle, M: Pancake syrup, N: Rubber ball

• B. K: Pancake syrup, L: Sugar cube, M: Plastic dish, N: Cotton candy

• C. K: Pancake syrup, L: Safety pin, M: Cotton candy, N: Iron needle

• D. K: Oil, L: Safety pin, M: Sugar cube, N: Rubber ball

Use the information and picture below to answer the question. The picture shows a mixture of water, sugar, and sand, which has settled in a glass beaker after it was stirred for a few minutes. How could the water be separated from the mixture so the beaker only has sugar and sand left?

• Filter the mixture, causing the sugar and sand to get caught but not the water.

• Heat the mixture, causing the water to evaporate.

• Stir the mixture, causing the water to move above the sugar and sand.

• Boil the mixture, causing the water to be destroyed.

How could the sand be removed, leaving only the water and sugar in the beaker?

• Use a filter, because the sugar will pass through with the water but the filter will catch the sand.

• Freeze the mixture, because the water and sugar will freeze and can be taken out without the sand.

• Use a magnet, because sand has magnetic properties and would be attracted to the magnet for removal.

• Heat the mixture, because the water and sugar solution will evaporate and leave the sand behind.