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Thursday 1.12 CORRECTIONS MM Unit Assessment Retake

Last updated 14 days ago
12 questions
  • Make corrections to your MM Unit Assessment Retake
  • Do only the questions you got wrong
  • Email me to grade your test at etuliao@kippsocal.org
  • You can find your original test at this link: https://goformative.com/formatives/6392112a7976c59ad37f02da
Use the information in this box to answer questions 1 - 3:

David put an energy drink in the freezer. When he took it out, it solidified and weighed 300 grams. David left it out on the counter to thaw. Once it completely melted he weighs it again.
2

How did the molecules change as they started to melt? (2 pts)

A) The molecules started moving faster and got farther apart
B) The molecules started moving slower and got closer together
C) The molecules changed from liquid molecules to solid molecules
D) The molecules got bigger and stopped moving.

2

How much would you expect the energy drink to weigh after it melted? (2 pts)

A) Less than 300 grams
B) Exactly 300 grams
C) More than 300 grams

4

An energy drink is a mixture of sugar, water, and food coloring. Which of these models is NOT a model of the particles in the energy drink? Select ALL THAT APPLY (4 pts)

2

Which of the following statements is true? (2 pts)

A) When a solid dissolves, its molecules disappear into the liquid.
B) No matter what the solid is, all of it will dissolve when added to a liquid.
C) When solids dissolve into a liquid their molecules spread apart and mix evenly

Use the information in this box to answer questions 5 - 10:

Valerie has two containers with white powders. She knows one is sugar and the other is cornstarch. She needs to figure out which one is sugar. Valerie mixed both substances with vinegar. Her observations are below.
Use this data table as evidence to answer Question 5 and 6

2

Valerie puts 5 grams of each powder into two different cups. Each cup contains 40 grams of water. She stirs each mixture for 90 seconds.

How much would you expect each mixture of water and powder to weigh? (2 pts)

A) 35 grams
B) 45 grams
C) 60 grams
D) 70 grams

Use this data table as evidence to answer the following questions.

When Valerie mixed each powder with water, she got the following results:

1

Which powder is sugar? (2 pts)

1

Which powder is cornstarch? (2 pts)

2

After Valerie mixed Powder T with water, she noticed it just disappeared! Which statement would best explain what really happened to the powder? (2 pts)

A) Powder T molecules change to a clear solid when added to water.
B) Powder T disappears completely from the water.
C) Powder T reacts with water to make a brand new substance.
D) Powder T breaks down into smaller particles that are mixed evenly throughout the water.

2

Why is the sugar soluble in water and the cornstarch is not? (2 pts)

A) The cornstarch particles are bigger than the sugar particles, so they don't fit between the vinegar better.
B) Valerie added to much cornstarch so it couldn't dissolve.
C) Valerie did mix the cornstarch with the water long enough
D) The sugar molecules are attracted to the water molecules, and the cornstarch molecules are not.

Valerie draws two models to explain what happened at the nanoscale level.
Use these models as evidence to answer Question 10.

3

Which of these models shows the sugar and water mixture? How do you know? (3 pts)

Sentence starters:
  • Claim: Model ___________ shows sugar and water.
  • Evidence: In Model ___________ , it shows _________________
  • Reasoning (Explanation): This means Model _________________ is sugar and water because _________________

Use the information in this box to answer questions 11-12:

For her next experiment, Valerie mixed together water and oil and noticed it separated into layers. Then she added Carrageenan to the mixture and stirs, the water and oil stayed mixed. To the right is a diagram of the two jars.
4

Which of the following statements about the water, oil and Carrageenan molecules are true? Select ALL that apply. (4 pts)

A) Water molecules are attracted to other water molecules
B) Oil molecules are attracted to other oil molecules
C) Water molecules are attracted to oil molecules
D) Water molecules are attracted to Carrageenan molecules
E) Oil molecules are attracted to Carrageenan molecules

Use the model below to answer Question 12

2

Valerie drew a model of the water, oil and carrageenan molecules. Is her model accurate? If not, why not? (2 pts)

A) It is accurate because it shows the water and oil molecules attracted to the carrageenan molecule.
B)It is not accurate because it shows the molecules mixed instead of separated.
C) It is accurate because it shows oil molecules attracted to the water molecules.
D) It is not accurate because it shows water and fat molecules attracted to each other.