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Lab 4 Pre-Laboratory Exercise 1 Provide a term that matches each description below. a Characteristic of a substance that can be observed without changing the composition of the substance. b Process of vapors from a boiling liquid condensing and returning to the boiling sample. C Characteristic of a substance that cannot be observed without altering the identity of the substance. d Describes a solid that does not dissolve in a liquid. e Transformation in which one or more new substances is produced. f Describes a liquid that mixes completely with another liquid. 2 Classify each of the following as either a physical or chemical change. a Steam condensing above a pot of boiling water. b Propane burning in a grill. C A banana peel turning black. d Baking a cake. e Snow melting. f Cocoa dissolving in milk. g A copper statue turning green. 3 Chemical and physical changes sometimes result in the production of a gas. Imagine such a scenario and describe two observations that might lead you to conclude that a gas was produced. a b 4 Explain how a physical property, such as boiling point, can help you distinguish one substance from another. Chemical and Physical Properties Lab 4 53

          Lab 4
Pre-Laboratory
Exercise
1 Provide a term that matches each description below.
a Characteristic of a substance that can be observed
without changing the composition of the substance.
b Process of vapors from a boiling liquid condensing and returning to the boiling sample.
C Characteristic of a substance that cannot be
observed without altering the identity of the substance.
d Describes a solid that does not dissolve in a liquid.
e Transformation in which one or more new substances is produced.
f Describes a liquid that mixes completely with another liquid.
2 Classify each of the following as either a physical or chemical change.
a Steam condensing above a pot of boiling water.
b Propane burning in a grill.
C A banana peel turning black.
d Baking a cake.
e Snow melting.
f Cocoa dissolving in milk.
g A copper statue turning green.
3 Chemical and physical changes sometimes result in the production of a gas. Imagine such a scenario and describe two observations
that might lead you to conclude that a gas was produced.
a
b
4 Explain how a physical property, such as boiling point, can help you distinguish one substance from another.
Chemical and Physical Properties
Lab 4
53

Lab 4
Pre-Laboratory
Exercise
1 Provide a term that matches each description below.
a Characteristic of a substance that can be observed
without changing the composition of the substance.
b Process of vapors from a boiling liquid condensing and returning to the boiling sample.
C Characteristic of a substance that cannot be
observed without altering the identity of the substance.
d Describes a solid that does not dissolve in a liquid.
e Transformation in which one or more new substances is produced.
f Describes a liquid that mixes completely with another liquid.
2 Classify each of the following as either a physical or chemical change.
a Steam condensing above a pot of boiling water.
b Propane burning in a grill.
C A banana peel turning black.
d Baking a cake.
e Snow melting.
f Cocoa dissolving in milk.
g A copper statue turning green.
3 Chemical and physical changes sometimes result in the production of a gas. Imagine such a scenario and describe two observations
that might lead you to conclude that a gas was produced.
a
b
4 Explain how a physical property, such as boiling point, can help you distinguish one substance from another.
Chemical and Physical Properties
Lab 4
53

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