Science Unit 5

A container has a mixture of salt and sand in it. How will adding water to the container help to separate the salt and sand?

• Salt will not dissolve in water, and sand will.

• Salt will sink, and sand will float to the top.

• Salt will dissolve in water, and sand will not.

• Salt will float to the top, and sand will sink.

The picture shows a mixture in a dish that a student has created by combining sand and iron filings. Which is the best way for the student to separate this mixture?

• The student should freeze the mixture.

• The student should add water to the mixture.

• The student should pull a magnet through the mixture.

• The student should pour the mixture through a strainer.

Jordan helps his dad make salsa. Jordan's dad cuts up tomatoes, a hot pepper, and an onion. Jordan combines all the ingredients together, adds hot sauce, and stirs. The picture shows the salsa they made. Which best describes what Jordan and his dad made?

• Jordan and his dad made a mixture, which is a physical change.

• Jordan and his dad made a mixture, which is a chemical change.

• Jordan and his dad made a new substance, which is a physical change.

• Jordan and his dad made a new substance, which is a chemical change.

Leah adds a cup of uncooked rice to a cup of dried peas in a bowl. Which of the following will NOT happen?

• The rice and peas will be able to be separated.

• The rice and peas will rest side by side in the bowl.

• The rice and peas will maintain their physical properties.

• The rice and peas will combine into a new chemical substance.

The picture below shows a pot of water that is being heated on a burner. If the water in this pot continues to be heated, which of the following will most likely happen?

• All of the water in the pot will become a solid.

• Some of the water in the pot will become a liquid.

• Some of the water in the pot will become a solid, and some of the water will become a gas.

• All of the water in the pot will become a gas, and eventually there will be no more liquid in the pot.

A student observes how a pile of snow has changed. The student records this data along with the time of day and the temperature outdoors. The data is shown. Which claim is BEST supported by the data?

• Solid water will change into liquid water if enough time has passed.

• Liquid water will change into solid water if enough time has passed.

• Solid water will change into liquid water if the temperature is cold enough.

• Liquid water will change into solid water if the temperature is cold enough.

Mia filled a cup with ice and then added water to it. Before she could take a drink of her ice water, her dad asked her to help him fold clothes. When she got back, all that was in her glass was liquid water. Mia claims that temperature is the reason that there was no ice left. Which argument best supports Mia's claim?

• The water was warmer than the ice and caused the ice to evaporate.

• The water was colder than the ice and caused the ice to condense

• The water was colder than the ice and caused the ice to freeze.

• The water was warmer than the ice and caused the ice to melt.