STAAR Review #4

Students plan to investigate the different states of matter. They will measure the volume of water in three containers after five days. They make this table to organize the data.

Which graph represents the volume of water most likely left in the container after five days?

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3.6C

Students conduct an investigation with breakfast cereal. The first four steps of the students' investigation are in the table shown.

The students are trying to determine the presence of which substance in the cereal?

• Sugar

• Salt

• Iron

• Wheat

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5.6B

The picture show tools that can be used for separating mixtures.

Which mixture is paired with the best tool for separating the materials?

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5.6C

A student heats 250 milliliters of water in a cup of approximately 50°C and adds 6 grams of salt. The mixture of salt and water is then stirred for 15 seconds.

Which results will the student MOST LIKELY observe after the mixture has been stirred for 15 second sand the salt dissolves?

• The salt will sink to the bottom of the cup

• The water will remain clear

• The salt will float on the water

• The water will change from clear to opaque white

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5.6C

A student pours 14 grams of sugar into a jar filled with 500 milliliters of water. The student thoroughly stirs the sugar and water to make a solution. Which change most likely occurs to the sugar when it is added to the water?

• The sugar breaks down to form a new substance in the solution.

• The sugar changes water into a new substance in the solution.

• The sugar floats on the surface of the water in the solution.

• The sugar completely dissolves in the solution.

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5.6C

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 too the sugar in the mixture?

• the sugar evaporated at a lower temperature in the refrigerator without causing any changes

• 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

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5.6C, 5.2F