Chemical Reactions

How do we know a chemical change has happened?

• There is a bang

• Something new is made

• Nothing new is made

Tags

NGSS.MS-PS1-2

Which of the following is not a sign of chemical change?

• Change is shape

• Change in colour

• Change in temperature

• Production of light or sound

Tags

NGSS.MS-PS1-2

Logs of pine wood are burning in a fireplace. What is a sign that a chemical change is happening to the wood?

• Heat and light are released

• The wood smells like pine

Tags

NGSS.MS-PS1-2

Chemical or Physical change?

Breaking an egg

• Chemical

• Physical

Which of the following is a chemical change?

• Water breaks down to form hydrogen gas and oxygen gas

• Water freezes to make ice

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True/False: Chemical changes are usually easy to reverse.

• True

• False

The smallest particle of an element; made of electrons, protons, and neutrons

• Atoms

• Elements

• Molecules

• Products

Tags

NGSS.MS-PS1-1

The reactants are found on which side of the equation?

• Left

• Right

The products are found on which side of the equation?

• Left

• Right

In the equation 2Na + 2H₂O --> 2NaOH + H₂ what are the reactants?

• 2Na & H₂

• 2H₂O & 2NaOH

• 2NaOH & H₂

• 2Na & 2H₂O

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2