2nd 9 WKS

Select all the correct answers. Choose all the options that show a chemical change.

• Rusty nails

• Broken mug

• Boiling kettle

• Burning wood

• Melting popsicle

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-4

Magnesium strips are long, thin strips that are gray and shiny. Which action will lead to a chemical change of magnesium strips?

• putting them in the freezer

• burning them with a candle

• cutting them into small pieces

• mixing them with pieces of copper

Tags

NGSS.MS-PS1-2

Which statement describes an action that most likely resulted in a chemical reaction?

• A. A pan of water was heated on a stove, and steam formed.

• B. A liquid was mixed with another liquid, and a precipitate formed.

• C. A liquid was sprayed into the air, and a sweet odor was smelled.

• D. A child blew through a wand filled with soap, and bubbles were produced.

Tags

NGSS.MS-PS1-2

Which of these observations is an indication that a chemical reaction has occurred?

• Steam forms above boiling water.

• A solid forms when a clear solution is frozen.

• A solid forms when two clear solutions are mixed.

• Sugar crystals form on the sides of a boiling pot of sugar water.

Tags

NGSS.MS-PS1-2

Which observation would indicate that a chemical reaction occurred?

• The vinegar took the shape of the container in step 1.

• The steel wool sank into the vinegar in step 3.

• The temperature of the vinegar increased during step 4.

• The steel wool changed shape during step 6.

Tags

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

A car is traveling down the street in direction A. Which of the forces shown in the figure would affect ONLY the speed of the car?

Tags

NGSS.MS-PS3-1

A baseball player swings his bat and hits a ball along the ground. After some time, the ball rolls to a stop on the level playing field. What MOST likely causes the ball to stop moving?

• a frictional force

• the size of the bat

• the mass of the ball

• a gravitational force

Tags

NGSS.MS-PS2-2

Don throws a ball in the air. The ball comes back to the ground because:

• the wind pushes on the ball with friction.

• the mass of Earth creates a pull of gravity on the ball.

• the core of Earth pulls on the ball with a magnetic attraction.

• the weight of the atmosphere pushes down on the ball.

Tags

NGSS.MS-PS2-4

In a tug-of-war game, balanced forces are BEST represented when both teams cause the flag to (a)   . Options: (A) stay in the middle, (B) fall to the ground, (C) move slowly in one direction, (D) be pulled quickly in one direction.

• stay in the middle
• fall to the ground

• move slowly in one direction

• be pulled quickly in one direction