1st 9 wks Review - 7th grade

A student is studying digestion in class. They have created a table to help them remember which parts of digestion are chemical and physical changes. Help the student complete the table correctly. Select the correct answer for: teeth breaking food down into smaller pieces.

• A) Physical change

• B) Chemical change

A student is studying digestion in class. They have created a table to help them remember which parts of digestion are chemical and physical changes. Help the student complete the table correctly. Select the correct answer for: saliva begins to breakdown carbohydrates.

• Physical change

• Chemical change

Which of the following are examples of a physical change? Choose ALL correct answers by clicking the appropriate boxes. There will be more than one answer.

• Valerie used a hot glue gun to melt a glue stick while working on a diorama for her science class.

• JB is trying to melt sugar to make a dessert. He left the sugar on the stove too long and it began to turn black and give off a strong odor.

• Marshall was camping and decided to chop wood to use for a fire.

• Brooke constantly left her bicycle outside in the rain. One day she noticed her bicycle chain had rust on it.

• Alia was teaching her son how to speak Arabic by watching novelas on tv.

Jason and Maria have been tasked to create real-world examples of matter undergoing physical and chemical changes. Which of the following are examples of a chemical change? Choose ALL correct answers by clicking the appropriate boxes. There will be more than one answer.

• Valerie used a hot glue gun to melt a glue stick while working on a diorama for her science class.

• JB is trying to melt sugar to make dessert. He left the sugar on the stove too long and it began to turn black and give off a strong odor.

• Marshall was camping and decided to chop wood to use for a fire.

• Brooke constantly left her bicycle outside in the rain. One day she noticed her bicycle chain had rust on it.

• Alia was teaching her son how to speak Arabic by watching novelas on tv.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following steps in the food's journey are physical changes and which are chemical changes?

secretion of enzymes in the saliva of the

mouth to break down food

• A) Physical

• B) Chemical

Which of the following steps in the food's journey are physical changes and which are chemical changes?

chewing of food in the mouth

• A) Physical

• B) Chemical

6CO2 + 6H20 + Sunlight → C6H1206 + 602

In the above formula, how many atoms of Carbon are on the product side of the equation?

• 6

• 2

• 13

• 12

Tags

NGSS.MS-PS1-1

This equation describes the chemical reaction that occurs during photosynthesis. 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ How many total atoms does C₆H₁₂O₆ contain?

• A. 2

• B. 6

• C. 12

• D. 24

Tags

NGSS.MS-PS1-1

How many elements does C₆H₁₂O₆ contain?

• 3

• 6

• 12

• 24

Tags

NGSS.MS-PS1-1

How many atoms, in total, are in the chemical formula below? Co(NO₃)₂

• 9

• 7

• 8

• 10

Tags

NGSS.MS-PS1-1