Matter Review

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 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

• 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

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

• 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

One morning, Ryan noticed there were tiny drops of water on the grass as he walked to school. That afternoon, he did not see an drops of water on the grass when he returned home. Which of the following best explains what happened to the drops of water?

• The heat from the air caused the water drops to boil.

• The air cooled the water and caused the drops to freeze.

• The Sun heated the water and caused the drops to evaporate

• The energy from the Sun caused the water drops to condense.

Each of the states of matter has specific characteristics. Which statement correctly describes one of these characteristics?

• Solids flow from one place to another.

• Gases can expand and be compressed.

• Liquids have definite volume and shape.

• The particles in solids have weak forces of attraction.