Matter classwork 2

Magnets can attract or repel each other when placed together. Which picture shows a set of magnets that will repel?

• A. [Image A]

• B. [Image B]

• C. [Image C]

• D. [Image D]

Students place a boiled egg in two identical jars. Both jars contain the same amount of water, but one has tap water and the other has saltwater. Which answer choice best explains why the boiled egg floats in the saltwater solution?

• A. The boiled egg is less dense than the saltwater solution.

• B. The boiled egg is more dense than the saltwater solution.

• C. The saltwater solution changes the mass of the boiled egg.

• D. The saltwater solution changes the volume of boiled egg.

The mass of the beaker and the liquid is 325 grams. If the mass of the beaker is 110 grams, what is the mass of the liquid inside the beaker? Which answer choice best explains how to find the mass of only the liquid?

• A. Add the mass of the beaker and the liquid with the mass of the beaker.

• B. Subtract the mass of the beaker from the mass of the beaker and the liquid combined.

• C. Subtract the mass of the beaker from the volume of the liquid.

• D. Add the mass of the beaker to the volume of the liquid.

The picture below is an electrical wire. What is the most reasonable answer for using copper in an electrical wire?

• A. Copper is a good insulator of electricity.

• B. Copper is magnetic.

• C. Copper is a good conductor of electricity.

• D. Copper is shiny.

During the investigation, one of the beakers falls to the ground and breaks. What should the student do next?

• Get another beaker out of the cabinet.

• Immediately clean up the glass.

• Report it to the teacher right away.

• Continue with the experiment.

Which object or objects ( Golf ball, Glass marble, Rubber Ball, Beach ball) would be the least dense in a tub of water? Explain why?

A student is dissolving sugar in water. What can the student do to make the sugar dissolve faster?

• Nothing, sugar will not dissolve in water.

• Add more water.

• Add ice to the water.

• Stir the solution.

Three jars are filled with the same amount of water and placed in the freezer overnight. The next day, a different type of material is wrapped around each jar and placed in a pan of hot water. Students observe the ice in each jar and discover that the jar wrapped in aluminum foil melts first, and the jar wrapped in cotton melts last. Which property of the different types of materials are the students most likely investigating?

• Ability to produce thermal energy

• States of matter

• Ability to conduct electricity

• Ability to insulate thermal energy

For homework, students were to find an example of a mixture in everyday life. All of the following correctly identify a mixture EXCEPT—

• Lettuce and tomato

• Gravel and sand

• Pepper and water

• Iron filings

The chart below classifies different types of mixtures and how they can be separated. Which answer choice best completes the chart for pasta and water?

• Place the mixture in the freezer.

• Pour the mixture through a screen filter to separate the water from the pasta.

• Use a magnet to separate the pasta.

• Use a beaker to separate the pasta.