Clues for Chemical Change

Clues for Chemical Change

Chemical changes make a new substance (a new type of matter).

Close Observations

These clues must be a result of forming a NEW substance to show that a chemical change has taken place.

Clue: Unusual Change of Color

• Leaves Changing

Clue: Unusual Change of Color

• Iron Rusting

Clue: Unusual Change of Color

• Litmus Paper

Clue: Unusual Change of Color

• Silver Tarnishing

Clue: Unusual Smell

• Rotting Food

Clue: Unusual Smell

• Composting Yard Waste

Clue: Changing Texture

• Baking Food

Clue: Changing Texture

• Digesting Food

Clue: Changing Temperature Without Adding or Removing Heat

• Instant Hot or Cold Pack

Clue: New Gas (Bubbles in a Liquid)

• Separate H₂O by Running Electricity Through It

Clue: New Gas (Bubbles in a Liquid)

• Baking Soda + Vinegar

Clue: New Gas (Bubbles in a Liquid)

• Yeast in Bread Rising

Clue: Produces (Makes) a Light

• Glowstick

Clue: Produces (Makes) a Light

• Bioluminescent Animals

• Lightening Bugs, Squid

Multiple Choice

Which clue indicates that leaves changing colors is a chemical change?

• unusual smell

• unusual change in color

Multiple Choice

Which clue indicates that a glowstick is a chemical change?

• release of a new gas

• produces a light

Multiple Choice

Which clue indicates that baking is a chemical change?

• change in texture

• unusual change in color

Multiple Choice

Which clue indicates that rotting is a chemical change?

• unusual smell

• produces a light

Chemical Change

• During Chemical Change, Atoms Rearrange

• Old Molecules Torn, New Molecules Form