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?

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.

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?

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?

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  ________  .

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?

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  ________.

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?

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?

Gina’s family played croquet, a lawn game in which balls are hit by mallets. Each player hits his or her ball around a path. The first person to hit the stake at the end of the path is the winner. All of Newton’s laws can be illustrated by a game of croquet. Choose the phrases that correctly complete the paragraph.

When the mallet hits the ball with an action force, the ball exerts a reaction force on the mallet, as explained by _______________  . The ball starts to move when the mallet applies a net force to it, as explained by  _____________ . Once a ball is hit and no longer touches the mallet, it continues moving because of its inertia, as explained by  _____________  .

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.

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?

Two school classes are playing tug-of-war with a rope. One class pulls on the rope with a 75 N force to the left, the other pulls with a 40 N force to the right. Which two statements describe this situation?

Choose the words that correctly complete the paragraph.

Susan ran the 400-m sprint at the track meet, and her final time was 65 s. She reported that her velocity in the race was 6.15 m/s. Susan’s statement was an inaccurate report of velocity because she mentioned only  ______  . She did not include  _________  , which is also a part of velocity.

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?