Which statement BEST explains why baking a cake is evidence of a chemical reaction?

• The state of matter of some of the ingredients changed while being cooked.

• The total mass of the ingredients was the same before and after they were cooked.

• The temperature of the ingredients increased as they absorbed thermal energy from the oven.

• The ingredients formed a new substance after they were cooked in the oven.

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

• There is a change in shape.

• There is a change in volume.

• The two liquids mix into a solution.

• The two liquids form a new substance.

Tags

NGSS.MS-PS1-2

How many grams of sulfuric acid were used in the reaction?

• 62 g

• 98 g

• 36 g

• 100 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

As long as the force acts on the object, the object will continue to move toward the east and its velocity will increase by ___ m/s every second.

Tags

NGSS.MS-PS2-2

Will the crate move toward the left, toward the right, or not at all? What is the direction and the magnitude of the net force on the crate?

• 13N to the left
• 13N to the right

• 93N to the left

• 93N to the right

Tags

NGSS.MS-PS2-2

Which rocket had the greatest acceleration?

• Rocket 1

• Rocket 2

• Rocket 3

• Rocket 4

Tags

NGSS.MS-PS2-2

Which diagram shows where the sphere will go first when it leaves the tube?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which description best identifies the action-reaction pair between the bird and the fence post?

• Action: The force of the bird on the wires Reaction: The force of the wires on the fence post

• Action: The force of the wires on the wires Reaction: The force of the bird on the fence post

• Action: The force of the fence post on the bird Reaction: The force of the bird on the wires

• Action: The force of the bird on the fence post Reaction: The force of the fence post on the bird

Tags

NGSS.MS-PS2-1

According to Newton’s first law, what happens to the steel ball just after the box stops?

• Because of friction, the ball continues rolling forward at the same speed.

• Because of friction, the ball rolls forward at an increased speed.

• Because of inertia, the ball continues rolling forward at the same speed.

• Because of inertia, the ball rolls forward at an increased speed.

Which statement best describes an action–reaction force pair in this situation?

• The wall pushes on the skater when the skater pushes on the wall.

• The wheels slow down, and the skater stops.

• The skater exerts a force on the wall, and the wheels exert a force on the floor and begin to turn.

• The friction of the floor decreases when the wheels roll on the floor.

Tags

NGSS.MS-PS2-1