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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following represents a chemical change?

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• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• color

• light

• shape

• temperature

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Four students recorded how long it took for 1 tsp of sugar to dissolve in 1 cup of water. Their setups and results are shown below.

Based on the 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

NGSS.MS-PS3-1

Four students dissolved 30 g of salt in 100 mL of water. Each student heated his or her water to a different temperature.

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

• Marcus

• Tyra

• Luis

• Andrew

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

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

NGSS.MS-PS1-2

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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• 
• 
• 

Tags

NGSS.MS-PS1-4