Unit 2 Science Test

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?

• A

• B

• C

• D

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

Tags

CCSS.RI.5.3

CCSS.RI.5.5

Based on evidence in the table, which claim explains what happened as the number of stirs increased?

• The speed of dissolving increased.

• The speed of dissolving decreased.

• The amount of sugar dissolved increased.

• The amount of sugar dissolved decreased.

Tags

CCSS.RI.5.8

CCSS.W.5.9A

Based on evidence in the table, for which student did the salt dissolve most quickly?

• Marcus

• Tyra

• Luis

• Andrew

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.L.5.4A

CCSS.RI.5.4

CCSS.W.5.2D

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