Reading

After having studied chemical reactions in school, Jose knew that when oxygen and hydrogen gases combine in the correct amounts, the combination yields a new substance, water. Choose the words to finish the sentence. The hydrogen and oxygen are ______ , while the water is the ________ .

• reactants; product

• product; reactants

• synthetic; polymers

• polymers; synthetic

Tags

NGSS.MS-PS1-5

Jerome has a tow truck, and he is in charge of moving several vehicles for the city. He wants to explain to his niece how towing vehicles relates to Newton’s second law. Which statement should he use?

• The greater the vehicular mass, the less force the tow truck will use.

• The greater the vehicular mass, the more force the tow truck will use.

• The vehicular mass has no effect on the amount of force the tow truck uses.

• The vehicular mass pulls on the tow truck in the opposite direction.

Tags

NGSS.MS-PS2-2

Choose the words and phrases that correctly complete the paragraph.

• increased; melted; decreased; froze

• stayed the same; froze; decreased; condensed

• increased; froze; decreased; melted

• stayed the same; sublimed; decreased then increased; froze

Tags

NGSS.MS-PS1-4

Liz is exploring the different kinds of changes that can happen to substances.

After reading about the kinds of changes that occur, she saw some rust on a pipe that was going into her house. What kind of change is the formation of rust?

• reactant

• product

• physical

• chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Macy has been studying physical and chemical reactions in school. She read about chemical reactions and how energy is either required or released during chemical reactions. Which word describes the direction of heat flow illustrated in the picture?

• chemical

• endothermic

• exothermic

• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Choose the words to finish the sentence. After learning about the law of conservation of mass, Sammy became interested in balancing equations. He knew that the symbol for aluminum was Al and silver tarnish was Ag₂S. He also knew that mixing the two chemicals yielded pure silver, or Ag, in an aluminum sulfide solution. The equation showing this reaction is shown below.

3 Ag₂S + 2 Al → 6 Ag + Al₂S₃. This equation is   _______  and it represents a   ________ chemical reaction.

• balanced; replacement

• synthesis; unbalanced

• unbalanced; balanced

• balanced; synthesis

Tags

NGSS.MS-PS1-5

Do you believe that you are pulled towards your science book, a bunch of grapes in your lunch, and your school building because of universal gravitation? Which two statements about universal gravitation are true?

• Gravity acts between you and each of these objects because all have mass.

• Gravity does not act between objects that are far apart, like you and the sun.

• Gravity only pulls things in a downward direction, like toward Earth's surface.

• Gravity acts between any two objects in the universe.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Tina is trying to determine whether she would have a greater gravitational attraction to the moon or to the cat next to her on the couch. Which statement about Tina’s gravitational attraction is true?

• She would have a greater gravitational attraction to her cat. Even though the cat contains less mass, she is much closer to the cat than the moon.

• She would have a greater gravitational attraction to the moon. Even though the moon is much further away, it contains much more mass than a cat.

• There is no gravitational attraction between Tina and the moon or Tina and the cat. The moon is too far and the cat doesn't have enough mass.

• There is equal gravitational attraction between Tina and the moon, and Tina and the cat.

Tags

NGSS.MS-PS2-4

Which of the following best describes the process of photosynthesis?

• A) Conversion of light energy into chemical energy by plants

• B) Breakdown of glucose into water and carbon dioxide

• C) Absorption of nutrients from the soil by plant roots

• D) Release of oxygen and absorption of carbon dioxide by animals

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the primary function of the human respiratory system?

• A) To transport nutrients to cells

• B) To exchange gases between the body and the environment

• C) To break down food into energy

• D) To circulate blood throughout the body