Chem Chapter 2 Review
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Separating a solid from a liquid by evaporating the liquid is called
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distillation
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What distinguishes a substance from a mixture?
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Mixtures can be separated physically, while compounds cannot.
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Which of the following represents a compound?
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H2O
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What must occur for a change to be a chemical reaction?
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There must be a change in chemical properties.
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Which state of matter has a definite volume and takes the shape of its container?
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liquid
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Which state of matter is characterized by having a definite shape and a definite volume?
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solid
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Which state of matter expands when heated and is easy to compress?
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gas
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All of the following are physical properties of a substance in the liquid state EXCEPT
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indefinite volume
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Which of the following is a physical change?
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evaporation
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Which of the following CANNOT be considered a single phase?
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a heterogeneous mixture
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Which of the following is a heterogenous mixture?
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oil and vinegar
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Which of the following is true about compounds?
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They are substances.
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What is one difference between a mixture and a compound?
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A compound can only be separated into its components by chemical means.
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The chemical formula of a compound does NOT indicate the
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how elements are joined in the compound
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What do chemical symbols and formulas represent, respectively?
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elements and compounds
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All of the following changes to a metal are physical changes EXCEPT
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rusting
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Which of the following does NOT involve a physical change?
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decomposing
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A chemical change occurs when a piece of wood
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decays
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Which of the following is a chemical property of water at 4 degrees C
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its ability to decompose into hydrogen and oxygen
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What must be done to be certain that a chemical change has taken place?
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Check the composition of the sample before and after the change.
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When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
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a chemical change
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Which of the following indicates that a chemical change has happened during cooking?
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The food darkens.
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A substance that forms a vapor is generally in what physical state at room temperature?
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liquid or solid
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Which of the following is a homogeneous mixture?
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salt water
