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Classify each description as either a chemical or physical change.
fall foliage changing color
apple rotting
glass cup shattering
inflating a balloon with helium
firefly glowing
fireworks exploding
photosynthesis
boiling water
making ice cubes
baking cookies
gasoline burning
shredding paper
sharpening a pencil
dissolving sugar in water
copper tarnishing
Classify each description as either a chemical or physical property.
flammability
density
volatility (ease of turning into a gas)
reactivity
melting point
color
luster (shiny or dull)
combustibility
solubility (ease of dissolving)
malleability
A substance that appears to "disappear" might do so because of a chemical change, but it might "disappear" because of a physical change. Explain what (and why!) you would need to look for (evidence!) in order to determine whether the change is chemical or physical.
Label each item as one of the following: element, compound, homogeneous mixture, or heterogeneous mixture.
sugar (C12H22O11)
jello
cake batter
oil and vinegar salad dressing
helium (He)
copper (Cu)
trail mix
carbon (C)
table salt (NaCl)
milk
water (H2O)
pizza
Which of the following is a physical change that takes place in the stomach?
Which of the following is a chemical change that takes place in the stomach?
What is one thing you could do to a piece of paper that represents a physical change?
What is one thing you could do to a piece of paper that represents a chemical change?
Picture 5 is best classified as...
Picture 6 is best classified as...
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Picture is 8 best classified as...
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Picture 10 is best classified as...