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Is burning wood a chemical or a physical change?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
What hazards exist when mixing unknown chemicals?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
A balloon is placed in a freezer and left overnight. Which would be evidence that a physical change occurred when the freezer was opened the next day? The balloon
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
Two students mix vinegar and baking soda. They observe bubbles forming, the baking soda dissolving, and the vinegar turning cloudy. They infer that a chemical change has occurred. Which data support this inference?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
How do you know when a chemical reaction has occurred?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
Scientists have developed special paints for the undersides of ships at sea. What problem are they trying to correct?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
A chemical change occurs when an egg cooks. What effect does the chemical change have on the physical properties of the egg?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
Salt is mixed with water and stirred. Is this a physical or chemical change? Why?
rusting of metal parts
has shrunk in size
A chemical change may create heat and expansion
bubbles formed
the egg has new physical properties
It is physical because it is easily reversible.
Chemical change
a new substance has formed, it would be hard to reverse
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