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WorksheetsChapter 3
Total questions: 19
Worksheet time: 13mins
Play dough molded into a new shape
Physical Change
Chemical Change
Fireworks
Physical Change
Chemical Change
Salt dissolving in water
Physical Change
Chemical Change
Lighting a match
Physical Change
Chemical Change
gas being produced
Physical Change
Chemical Change
Mold growing on cheese
Physical Change
Chemical Change
Ice cream melting
Physical Change
Chemical Change
Frying an Egg
Physical Change
Chemical Change
Every chemical change involves a transfer of ______.
mass
volume
density
energy
Which of the following observations would indicate a chemical change has happened? Select ALL correct answers.
a solid precipitate forms
heat energy is released
breaks into smaller pieces
folded in half
a gas is produced
N2 + 3 H2 = (a) NH3
(a) KClO3 = 2KCl + 3 O2
C3H8 + 8O2 = (a) CO2 + 4H2O
2Na + 2H2O = (a) NaOH + H2
(a) are the starting materials in the chemical reaction.
The number of atoms of each element on both sides of the equation must be (a) because matter cannot be destroyed or created.
(a) are the new substance that formed in the chemical reaction.
Suppose you have a gas in a closed container. Explain what would happen to the
mass and density of the gas if you expand it to double the volume.
