The Law of Conservation of Mass Assessment

The amount of matter in an object is its _________.

• Compound

• Mass

• Closed System

• Products

Tags

NGSS.MS-PS1-5

What does The Law of Conservation of Mass state?

• Mass is always created at the end of a reaction

• Mass can sometimes be created

• Mass can not be created or destroyed (it just transforms)

• Mass is only created in chemical reactions

Tags

NGSS.MS-PS1-5

When you burn a candle, all that remains is a small puddle of wax. The puddle of wax has less mass than the original candle. The rest of the original candle’s mass was

• Destroyed

• Transformed into gases

• Measured Incorrectly

• None of the above

Tags

NGSS.MS-PS1-5

An example of a chemical reaction is ___________.

• Cutting a sheet of Paper into think strips

• Freezing water into ice cubes

• Dissolving sugar into a glass of water

• Burning wood

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

An example of a physical change is __________.

• Burning Wood

• Food Rotting

• Burning a slice of toast

• Dissolving salt into a glass of water

How many hydrogen atoms are in this compound?

• 4

• 2

• 1

• 7

Tags

NGSS.MS-PS1-1

The number of atoms on my reactants side, should equal the number atoms on my products side.

• True

• False

Tags

NGSS.MS-PS1-5

In an open system matter is unable to flow in or out of the system.

• True

• False

Tags

NGSS.MS-LS2-3

What number represents the subscript in the chemical compound pictured?

• 3

• 2

• There isn't one

• 1

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

_______ are the substance(s) that are left after a chemical change has taken place.

• Open system

• Mass

• Products

• Reactants

Tags

NGSS.MS-PS1-2