Science Checkpoint 2 Matter

The diagram contains information about the phases of two substances. In which phase will each substance be when the temperature reaches 83ºC?

• Substance 1 will be a gas, and Substance 2 will be a gas.

• Substance 1 will be a solid, and Substance 2 will be a liquid.

• Substance 1 will be a liquid, and Substance 2 will be a gas.

• Substance 1 will be a liquid, and Substance 2 will be a solid.

A student changes the temperature of 5 mL of an unknown liquid (Substance R) for 30 minutes. The student records observations in a table. Which of the following statements correctly describes the student's observations?

• Solid Substance R starts to change into a liquid at 100 °C.

• Liquid Substance R starts to change into a gas at 100 °C.

• Solid Substance R always requires 30 minutes to change into a liquid completely.

• Liquid Substance R always requires 30 minutes to change into a gas completely.

Malik weighed an empty beaker. The beaker weighed 50 grams. Then Malik added 115 grams of water to the beaker. He placed the beaker of water in a freezer until the water became solid ice. Which prediction should Malik make about the ice in the beaker?

• The ice will weigh less than 115 grams. After the ice melts, the water will weigh less than 115 grams.

• The ice will weigh less than 115 grams. After the ice melts, the water will weigh 115 grams.

• The ice will weigh 115 grams. After the ice melts, the water will weigh less than 115 grams.

• The ice will weigh 115 grams. After the ice melts, the water will weigh 115 grams.

A student drops an antacid tablet into warm water in an open cup. Bubbles immediately form in the water and rise to the surface. The table lists the mass of each substance. Why does the student measure the mass of the mixture as only 103 grams, and which change can the student make to get an exact measurement of the mass of the antacid tablet mixed in water?

• Some of the matter escapes when the substances are mixed together, so the student should use a taller cup.

• Some of the matter from the antacid tablet disappears in the water, so the student should use less water in the cup.

• Some of the matter changes to a gas and leaves the cup, so the student should cover the cup with a lid when the two substances are mixed.

• Some of the matter sticks to the sides of the cup, so the student should make sure the cup is clean before the two substances are mixed.

Veronica weighed an empty bowl and recorded its mass. Then she placed three ice cubes in the bowl and weighed it again. After the ice melted, she recorded the mass of the bowl and the water. She put the data in a table. What conclusion should Veronica make from her observations?

• The masses of the water and the ice were both 43 grams, so the amount of matter did not change.

• The masses of the water and the ice were both 153 grams, so the amount of matter did not change.

• Some of the water spilled because the mass of liquid water should have been greater than the mass of solid ice.

• There was an error in weighing the ice because the mass of liquid water should have been less than the mass of solid ice.

Look at the data in the picture. Which conclusion is BEST supported by the data?

• Sugar dissolves best at 22°C.

• Sugar dissolves best at 60°C.

• Sugar dissolves fastest between 22°C and 45°C.

• Sugar dissolves fastest between 45°C and 60°C.

A student designs an experiment to determine the effect of water temperature on the time it takes sugar to dissolve. For the experiment, the student uses sugar cubes and granular sugar, which is made by crushing sugar cubes. The table contains information about each trial. Which change will improve the student's experiment?

• add another type of sugar

• stir the mixture during two of the trials

• include more temperatures

• keep the amount of sugar the same for all trials

A student places each of three red, cherry-flavored lollipops in a cup of water at 45°C. The student gives each cup different experimental conditions, as shown in the table. The student measures how long it takes each lollipop to dissolve. Which graph shows the likely results from the experiment?

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Two liquids are mixed in a container. The properties of the liquids by themselves are different than the properties of the mixed liquid in the container. What are the changing properties evidence of?

• A mixture has formed.

• A new substance has formed.

• The mixture is too large for the container.

• The mixture produced has less mass than the original two liquids combined.

White salt is mixed with tiny pieces of iron. The table shows the properties of the substances before and after they are mixed. According to the table, what happens to the properties of substances when they are mixed to form a mixture?

• They switch properties.

• Their properties change completely.

• Their properties remain unchanged.

• They partially change their properties.