Unit 5: The Nature of Matter

Jacob put yeast into a bowl of water and added a little sugar. He put the bowl in a warm place. After a while, Jacob observed foam spilling out of the bowl. What kind of change is occurring?

• physical change

• chemical change

• scientific change

• geological change

Mai filled two balloons with the same amounts of water, sugar, and yeast. She put one on a table in the classroom. She put the other on a sunny windowsill. Which reasoning explains why Mai observed that the balloon in the window grew larger in size?

• The windowsill area is cooler.

• The windowsill area is warmer.

• The classroom table area is warmer.

• The classroom table area is the same temperature as the windowsill.

Which of the following represents a chemical change?

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Which of these conditions has the greatest effect on how quickly a substance changes from one state to another?

• color

• light

• shape

• temperature

Why does milk have to be kept in a refrigerator?

• Milk tastes better when it is cold.

• The reactions that cause milk to spoil are slower at lower temperatures.

• Physical changes that cause milk to spoil are slower at lower temperatures.

• No chemical or physical changes can occur at cool temperatures.

Sergio tested a control solution at room temperature (25 °C), and measured how fast salt dissolved in it. Next, he cooled solution A to 10 °C and heated solution B to 40 °C. How quickly did the salt dissolve in solutions A and B compared to the control?

• faster for solutions A and B

• faster for solution A and slower for solution B

• slower for solution A and faster for solution B

• slower for solutions A and B

Felix is helping his father cook dinner. After Felix adds salt to the boiling water, what will he have in the pot?

• a mixture called a solution

• a solution called a mixture

• a mixture called a combination

• a solution called a combination

Tags

CCSS.RI.5.4

CCSS.L.5.4A

Gavin took a picnic to a sandy beach. He brought a garden salad and lemonade. Which of these best describes sand, a garden salad, and lemonade?

• atoms

• mixtures

• solutes

• solutions

Tania’s mom boils water in a pot on the stove to make soup. Which of these ingredients will dissolve in the water?

• garlic

• oil

• pepper

• salt

The following pictures show the particles of a substance in different states. All of the pictures show the same substance. Which is most likely a solid?

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