MM End of Unit Test - Elorde Tuliao | Library

2

How did the molecules in the gatorade change as they solidified? (2 pts)

2

How much would you expect the gatorade bottle to weigh after it solidified? (2 pts)

2

Which statement best describes how the Gatorade is different after it solidified? (2 pts)

Use the pictures below to answer Question 4

2

Gatorade is a mixture of water, sugar, and food coloring. Which of these models could be a model of the particles in gatorade? (2 pts)

2

Which of the following objects are on a nanoscale, and cannot be viewed with the human eye? Select ALL that apply. (2 pts)

2

Which of the following statements are true? Select ALL that apply. (2 pts)

Use the information in this box to answer questions 7 - 12:

Keisha and her younger sister are helping their mom to make dinner. Keisha’s mom asks her to get the flour so that she can make gravy. When Keisha looks in the cabinet, she sees two clear containers with white powders. Her mom says one is baking soda and one is flour, but they aren’t labeled. She needs to figure out which one is flour.

Keisha remembers an experiment she did in her science class about identifying different powders. She gets her science notebook, and turns to her data:

(Use this data table as evidence to answer Question 8 and 9)

Keisha decides to mix both of the unlabeled powders into water and observe what happens. She puts 10 grams of each powder into two different cups. Each cup contains 100 grams of water. She stirs each mixture for 60 seconds.

2

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

Use this checklist to write your paragraph for Question 8

4

Why did Keisha choose to use the property of solubility in water, and not the particle size or color to identify the two powders? (4 pts)

Sentence starters:
Claim: Keisha used the solubility because _
Evidence: In the data table of powder properties, it shows _
Reasoning (Explanation): Explain your claim (answer) for why Keisha used the property of solubility.

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

2

Identify each powder, based on the experiment’s results. Choose TWO answers, one answer for Powder A and one answer for Powder B. (2 pts)

2

After Keisha mixed Powder A with water, her little sister said, “Wow! The powder just disappeared! It’s totally gone!” Which statement would best explain what really happened to the powder? (2 pts)

2

Why is the baking soda soluble in water and the flour is not? (2 pts)

Keisha’s sister is still having difficulty understanding what is happening, so she draws two models to explain what happened at the nanoscale level.

(Use these models as evidence to answer Question 12)

Use this checklist to write your paragraph for Question 12

4

Which of these models shows the baking soda and water mixture? How do you know? (4 pts)

Sentence starters:
Claim: Model _____ (Choose Model 1 or Model 2) shows baking soda and water.
Evidence: In Model _ (Choose Model 1 or Model 2) , it shows _____
Reasoning (Explanation): This means _ (Choose Model 1 or Model 2) is baking soda and water because _________

Use the information in this box to answer questions 13-15:

After figuring out which powder is flour, Keisha’s mom makes gravy. Keisha notices that two of the ingredients her mom uses are water and chicken fat. When the water and chicken fat are mixed together, the mixture separates into layers. When Keisha’s mom adds gelatin to the mixture and stirs, the gravy stays mixed.

Keisha draws a diagram of the mixture before and after adding the gelatin in her notebook.

2

Which of the following statements about the water, fat and gelatin molecules are true? Select ALL that apply. (2 pts)

Use the picture below to answer Question 14

2

Keisha’s sister drew a model of the water, fat and gelatin molecules in the gravy. Is her model accurate? If not, why not? (2 pts)

Use this checklist to write your paragraph for Question 15

You can use these words in your paragraph for Question 15

7

Based on your investigations into emulsifiers during this unit, why do water and fat separate into layers when they are stirred together, but completely mix when gelatin is stirred in? (7 pts)

Sentence starters:
Claim: Water and fat separate into layers because _____ . Water and fat completely mix when gelatin is added and stirred because _.
Evidence 1: In the _ (Choose one piece of evidence from the table below) , it showed ___
Evidence 2: In the _ (Choose a different piece of evidence from the table below) , it showed ___
Reasoning (Explanation): When liquids separate, this means _. These liquids mix when _ because _________

You can use these resources for evidence for Question 15.