7th grade midterm review 2425

All   _______ is made up of tiny particles called   ________  that are too small to be seen. They are the smallest particles that can still be considered a(n)  ____________  .

• matter; element; atoms

• matter; particles; cells

• cells; atoms; particles

• cells; matter; atoms

Tags

NGSS.MS-PS1-1

Keesha performed a chemical reaction and the products looked quite different from the reactants. She knew the amount of matter had not changed due to the law of conservation of mass. According to the law of conservation of mass, what happens in a chemical reaction?

• Matter is not created or destroyed and the same amount of mass remains.

• A new kind of matter is created and the amount of mass either increases or decreases.

• Matter is not created or destroyed and the amount of mass may change after the reaction.

• New matter is created and changes form so that the mass of the reactants and the products will almost be equal.

Tags

NGSS.MS-PS1-5

The difference between a physical change and a chemical change is that a chemical change makes a new substance. For example, when water freezes, it goes through a physical change, but it does not change into a different substance. Choose the three items that describe physical changes.

• rusting metal

• boiling water

• breaking ice

• carving a wooden statue

• baking a cake

A zoologist was studying cheetahs in the wild and was especially interested in learning about how they move. The zoologist plotted the movement of one of the cheetahs. What information does this graph provide about the cheetah’s motion?

• The cheetah is running and accelerating its speed as it runs.

• The cheetah is running and then stops before starting again.

• The cheetah is running at a constant speed.

• The cheetah is running at a variable speed.

Tags

NGSS.MS-PS3-1

Annie learns that the compound sulfuric acid is called the universal chemical. The acid is used in everything from gasoline to paper. Annie uses beads in three different colors to model sulfuric acid. Based on the model, what is the chemical formula of sulfuric acid?

• S₂HO₄

• O₂H₄S

• 
  S₄O₂H

• H₂SO₄

Tags

NGSS.MS-PS1-1

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-PS2-1

NGSS.MS-PS2-2

Choose the words and phrases that correctly complete the paragraph.

Chase and Bernie were ice-fishing at a frozen pond where the temperature was –4⁰C. As the boys sat on the ice, the thermal energy of the ice   ________ , and some of the ice _______. One of Bernie’s gloves became wet. As it sat in the cold air, the thermal energy of the water on the glove  _________, and the water on the glove  ________.

• 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

NGSS.MS-PS3-4

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

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-PS1-4

NGSS.MS-PS3-3