Unit 2: Part 2 Review

Raisin bran cereal is an example of a

• mixture

• solution

Does mixing cereal with milk make a new substance?

• Yes, because the color of the milk changes.

• Yes, because the sugar dissolves and the cereal gets wet.

• No, because mixing substances cannot make new substances.

• No, because you can separate the cereal from the milk to get the original substances back.

Tags

NGSS.MS-PS1-2

Mary mixed 100 milliliters (mL) of water with 12 mL of sugar in a bowl. She left the bowl with the sugar and water mixture outdoors. After a week, she noticed crystals and a small amount of liquid at the bottom of the bowl. Which sentence describes what happened in the bowl?

• There was one new substance formed.

• There were no new substances formed.

• There were two new substances formed.

• There were many new substances formed.

Tags

NGSS.MS-PS1-2

Carol was told by her teacher to create a mixture in a container. Give an example of a mixture.

Susan put some sand, rocks, and paper clips in a bucket. She added some water. Which is an example of how Susan can separate the mixture into its individual parts?

• Shake it

• Use a magnet

• Use Tweezers

• Throw it

Danea has a mixture of two solids. One is white and is tiny crystals. The other solid is black and is tiny flakes. She pours water on them. The white solid disappears, and the black solid floats to the top of the water. Which two materials did Danea most likely mix together?

• salt and pepper

• milk and iron filings

• white and black sand

• sugar and powdered drink mix

Which is a chemical change?

• freezing

• melting

• rusting

• mixing

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

LaToya measured 60 milliliters of vinegar into a bottle. She measured 5 grams of baking soda into a balloon. She placed the balloon over the top of the bottle and shook the baking soda into the vinegar. She repeated these steps, adding 10, 15, and 20 grams of baking soda. She put her observations in a table. Which conclusion is supported by her data?

• When more vinegar was added, a larger volume of solid formed.

• When more baking soda was added, a larger volume of gas formed.

• Changing the weight of baking soda added did not change the results of the investigation.

• Changing the volume of vinegar added changed the reaction from a physical to a chemical change.

Tags

NGSS.MS-PS1-2

Joyce measured 60 milliliters of hydrogen peroxide into a beaker and measured its temperature. She added yeast to the hydrogen peroxide and stirred the beaker. She measured the temperature at three different times in degrees Celsius, °C. She wrote down her measurements and observations in a table. Which sentence describes her results?

• Stirring caused the temperature to increase and fewer bubbles to form.

• A physical change caused the temperature to decrease and bubbles to form.

• A chemical change caused the temperature to increase and more bubbles to form.

• Mixing two substances caused the temperature to decrease and fewer bubbles to form.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A substance which helps speed up a chemical reaction, but does not become a product of the reaction is called a _______.

Tags

NGSS.HS-PS1-5