Physical and Chemical Changes

A student accidently spilled vinegar into a glass of milk. Soon a strange solid appeared. What sign is present that a chemical reaction has happened?

• A precipitate formed.

• The color changed.

• The temperature changed.

• A gas was produced.

Tags

NGSS.MS-PS1-2

What happens to the atoms of matter after a chemical change?

• The atoms are destroyed.

• New atoms are created

• Bonds are broken and new bonds are formed.

Tags

NGSS.MS-PS1-5

Which changes are physical changes?

• Cutting paper

• Toasting Bread

• Crushing a Can

• Painting a Fence

• Dissolving Sugar

Which changes are chemical changes?

• Cutting paper

• Toasting Bread

• A Rotting Banana

• Fireworks Display

• Rusting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Over time a banana on the counter turned brown. What sign is present that a chemical reaction happened?

• A precipitate formed.

• The color changed.

• The temperature changed.

• A gas was produced.

Tags

NGSS.MS-PS1-2

Logs were burned in a fireplace. What sign is present that a chemical reaction happened?

• A precipitate formed.

• The total mass decreased.

• The total mass increased.

• Heat was given off.

Tags

NGSS.MS-PS1-2

Which of the following is a reactant in the equation?

• Na

• NaCl

• 2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a product in the equation?

• Na

• NaCl

• 2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When the candle was lit, a pool of liquid wax formed in the area around the wick, and then spilled over the side and solidified. Does this observation refer to a physical change or a chemical change?

• physical change

• chemical change

• None of the above

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Is the reaction that occurs in the diagram endothermic or exothermic?

• exothermic

• endothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5