Jacob put yeast into two bowls of water and added a little sugar to each bowl. He put one bowl in a warm place and the other bowl into the refrigerator. After a while, Jacob observed tan-colored foam spilling over the sides of the warm bowl. What kind of change is this?

• physical change

• chemical change

• scientific change

• geological change

Tags

NGSS.MS-PS1-2

Sameh put a mixture of yeast, water, and sugar into a balloon. The picture shows his balloon when he started and what it looked like 1 hour later.

What kind of change did he observe?

• physical change

• chemical change

• scientific change

• geological change

Tags

NGSS.MS-PS1-2

Ava put water, sugar, and yeast into a balloon. Then she put the balloon into a pan of warm water and observed how the balloon changed. Next, Matthew repeated the investigation with another balloon. What is the best reason for Matthew to repeat it?

• to write the same report

• to practice the experiment

• to come to the same conclusion

• to be sure the observations are accurate

Taylor put the same amounts of water, sugar, and yeast into three balloons. Then she put each one in a place with a different temperature and observed the changes. If someone wanted to replicate Taylor’s experiment, what other information would they need?

• the mass of each balloon and what was in it

• the temperature where each balloon was placed

• the size of the table where each balloon was placed

• the total mass of all balloons and what was in them

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS1-2

Mick lit a candle. The flame heated the top of the candle. The picture below shows how the candle looked after 15 min.

Which property of the candle wax changed when the flame heated the top of the candle?

• color

• state

• volume

• weight

Tags

NGSS.MS-PS1-4

Water can be a solid, a liquid, or a gas. The state of water can change as its temperature changes. Which of the following is a change in the state of water that could occur?

• changing a gas directly to a solid by increasing the temperature

• changing a gas directly to a liquid by increasing the temperature

• changing a solid directly to a liquid by decreasing the temperature

• changing a liquid directly to a solid by increasing the temperature

Tags

NGSS.MS-PS1-4

When an egg is cracked and put in a hot pan, it flows easily. After it cooks for a minute, the egg becomes solid.

Why does the egg change?

• Breaking the shell is a physical change in the egg that makes it solid.

• Breaking the shell is a chemical change that makes the egg become solid.

• Heating the egg on the stove causes the egg to evaporate and become solid.

• Adding heat causes a chemical change in the molecules of the egg that makes it solid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Micah placed a beaker of water on a hot plate. When bubbles started coming to the top of the water, he made the first sketch. After 5 min, Micah made the second sketch.

What happened during the 5 min that Micah was observing the beaker of water?

• Water was changed into energy during a chemical change.

• Water was changed into a different state during a physical change.

• Water was changed into a different material during a physical change.

• Water was changed into a different material during a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

When a hiking club went on an outing, they took marshmallows to roast over a campfire.

Which of these changes is a physical change?

• Wood burns and forms ash.

• Smoke forms above the fire.

• Air expands and moves away from the fire.

• Marshmallows become blackened and crispy.

Tags

NGSS.MS-PS1-4

Study the image. Which two changes shown are physical changes?

• chopping wood and boiling water

• cooking food and burning wood

• burning wood and boiling water

• cooking food and chopping wood

Tags

NGSS.MS-PS1-2