Review: Phys/Chem Changes and Counting Atoms

Which word is not evidence of a physical change?

• dissolve

• evaporate

• melt

• gas formation

True or False: Observing bubbles in boiling water is evidence of chemical change.

• True

• False

A chemical reaction always creates

• a copy of its chemicals

• a new atom

• a new substance

• the same substance

Tags

NGSS.MS-PS1-2

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

• increase in temperature

• production of light

• bubbling or gas

• dissolve

Tags

NGSS.MS-PS1-2

A clear liquid and a blue liquid were combined. The liquid turned bright orange. What is true?

• this is a chemical change

• this is a physical change

• food coloring was added

• no new substance was formed

Tags

NGSS.MS-PS1-2

True or False: There are 4 atoms of Sulfur (S) in Fe₂SO₄

• True

• False

Tags

NGSS.MS-PS1-1

How many total atoms are in the formula NaCl?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Hydrogen (H) atoms are in 2C₂H₃O₂

• 2

• 3

• 6

• 14

Tags

NGSS.MS-PS1-1

True or False: There are 3 atoms of Oxygen (O) in Fe(OH)₃

• True

• False

Tags

NGSS.MS-PS1-1

A powder dissolves in a liquid. The temperature decreases quickly. A chemical reaction has occurred.

• True

• False

Tags

NGSS.MS-PS1-2