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21) Which of the following statements about compounds is TRUE? A) A substance that cannot be broken down into simpler substances. B) A pure substance that has variable composition throughout. C) A substance composed of two or more elements in fixed, definite proportions. D) A substance that is not as common as pure elements. E) none of the above 22) Which of the following statements is FALSE? A) Matter may be a pure substance or it may be a mixture. B) A pure substance may either be an element or a compound. C) A mixture may be either homogeneous or heterogeneous. D) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both. E) All of the above statements are true. 23) How would you classify salt water? A) pure substance-compound B) mixture-heterogeneous C) pure substance-element D) mixture-homogeneous E) none of the above 24) Physical properties are: A) those that a substance displays only through changing its composition. B) those that cause atoms and molecules to change. C) those that a substance displays without changing its composition. D) identical for all solid matter. E) none of the above 25) All of the following can be considered physical properties EXCEPT: A) taste. B) color. C) flammability. D) density. E) boiling point.

          21) Which of the following statements about compounds is TRUE?

A) A substance that cannot be broken down into simpler substances.
B) A pure substance that has variable composition throughout.
C) A substance composed of two or more elements in fixed, definite proportions.
D) A substance that is not as common as pure elements.
E) none of the above

22) Which of the following statements is FALSE?

A) Matter may be a pure substance or it may be a mixture.
B) A pure substance may either be an element or a compound.
C) A mixture may be either homogeneous or heterogeneous.
D) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both.
E) All of the above statements are true.

23) How would you classify salt water?

A) pure substance-compound
B) mixture-heterogeneous
C) pure substance-element
D) mixture-homogeneous
E) none of the above

24) Physical properties are:

A) those that a substance displays only through changing its composition.
B) those that cause atoms and molecules to change.
C) those that a substance displays without changing its composition.
D) identical for all solid matter.
E) none of the above

25) All of the following can be considered physical properties EXCEPT:

A) taste.
B) color.
C) flammability.
D) density.
E) boiling point.

21) Which of the following statements about compounds is TRUE?

A) A substance that cannot be broken down into simpler substances.
B) A pure substance that has variable composition throughout.
C) A substance composed of two or more elements in fixed, definite proportions.
D) A substance that is not as common as pure elements.
E) none of the above

22) Which of the following statements is FALSE?

A) Matter may be a pure substance or it may be a mixture.
B) A pure substance may either be an element or a compound.
C) A mixture may be either homogeneous or heterogeneous.
D) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both.
E) All of the above statements are true.

23) How would you classify salt water?

A) pure substance-compound
B) mixture-heterogeneous
C) pure substance-element
D) mixture-homogeneous
E) none of the above

24) Physical properties are:

A) those that a substance displays only through changing its composition.
B) those that cause atoms and molecules to change.
C) those that a substance displays without changing its composition.
D) identical for all solid matter.
E) none of the above

25) All of the following can be considered physical properties EXCEPT:

A) taste.
B) color.
C) flammability.
D) density.
E) boiling point.

Added by Eduardo J.

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