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Classify each description as either a chemical or physical change.
baking cookies
fall foliage changing color
firefly glowing
shredding paper
dissolving sugar in water
making ice cubes
boiling water
gasoline burning
glass cup shattering
sharpening a pencil
photosynthesis
copper tarnishing
fireworks exploding
apple rotting
inflating a balloon with helium
Classify each description as either a chemical or physical property.
density
reactivity
luster (shiny or dull)
melting point
solubility (ease of dissolving)
volatility (ease of turning into a gas)
malleability
combustibility
color
flammability
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.
carbon (C)
table salt (NaCl)
water (H2O)
oil and vinegar salad dressing
copper (Cu)
helium (He)
sugar (C12H22O11)
milk
cake batter
trail mix
jello
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...