IPhysical & Chemical Changes and Law of Conservation of Matter

Wood being burned is a ________ change; wood sawed in two is ________ change.

• chemical; physical

• physical; chemical

• chemical; chemical

• physical; physical

Tags

NGSS.MS-PS1-2

Which images show a physical property?

Choose all that apply.

• I

• II

• III

• IV

• V

Tags

NGSS.MS-PS1-4

Physical properties can be used to describe matter. Some properties are dependent on the amount of matter present. All BUT ONE of these physical properties changes with the amount of matter. That is

• density

• mass

• volume

• weight

Signs that say "do not use near an open flame" refer to a(n)

• energy property

• chemical property

• physical property

• mechanical property

Tags

NGSS.MS-PS3-4

This flask originally held some copper wire and a clear solution of nitric acid. The two substances reacted and produced a brown gas and a blue solution. This reaction cannot be reversed. Evidence of a chemical reaction is shown by

• ice forming.

• steam rising.

• the formation of a gas.

• a change in state from a solid to a liquid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The images show two commonly observed changes.

Which statement correctly describes one of the changes?

• Picture I shows a chemical change, because a new substance is formed.

• Picture II shows a chemical change, because a new substance is formed.

• Picture I shows a chemical change, because the same substance changes form.

• Picture II shows a chemical change, because the same substance changes form.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is a physical change?

• burning wood

• rusting metal

• cooking an egg

• freezing water

Tags

NGSS.MS-PS1-4

You and your lab partner take two clear liquids and mix them together. When observing the final product, you notice a yellow solid has formed. What is the term for the solid that is formed as a result of a chemical change?

• condensate

• evaporate

• precipitate

• sublimate

Tags

NGSS.MS-PS1-2

Below are several scenarios where change is happening. The question is, what kind of change?

Choose the ones which are chemical changes.

• After pouring baking soda into vinegar, it begins to fizz.

• Putting two cubes of ice into a soda

• An iron nail slowly rusts and turns reddish-brown

• Breaking a matchstick

• Lighting a matchstick

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Below are several scenarios where change is happening. The question is, what kind of change?

Choose the ones which are NOT chemical changes?

• After pouring baking soda into vinegar, it begins to fizz.

• Putting two cubes of ice into a soda

• An iron nail slowly rusts and turns reddish-brown

• Painting the walls of a dollhouse red

• Breaking a matchstick

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5