Which of the following is an example of a chemical reaction?

• lighting a match

• dissolving salt into water

• freezing water

• breaking a glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You can separate sugar from sand because sugar is ________ and sand is not.

• malleable

• ductile

• soluble in water

• acidic

Which of the following statements are false?

• Dissolving salt into water is an example of a mixture

• The mass of one piece of paper is the same even after it is ripped in half and the two pieces measured again

• Increasing the temperature of water to a boil is a physical change.

• The formation of a precipitate is the only way to see if a chemical change has occurred.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True or False

Volume is an example of a size-dependent property.

What number should be in place of the question mark to keep the law of conservation of mass true?

2 Na + 2 H20 = _?_ NaOH + H2

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

The melting point of silver is a _______.

• chemical change

• chemical property

• physical property

• physical change

Tags

NGSS.MS-PS1-4

What happens to an iron nail when it rusts?

• The nail becomes heavier because rust weighs mort than iron.

• Oxygen in the air dissolves part of the iron.

• the nail becomes lighter because rust heats the iron.

• Iron reacts with oxygen in the air, creating iron oxide.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True or False

The ability of a match to burn is an example of a chemical change.

Tags

NGSS.MS-PS1-2

All of the following are examples of physical changes EXCEPT _______.

• melting

• evaporating

• burning

• solidifying

Tags

NGSS.MS-PS1-4

The following are examples of physical properties EXCEPT______.

• density

• shape

• color

• ability to react with oxygen