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6. Which statement is TRUE regarding pure substances?
A. Pure substances can be broken down into simpler elements physically.
B. Pure substances are physical combinations of two or more elements.
C. Pure substances have definite boiling and melting points.
D. Pure substances maybe homogeneous or heterogeneous.

7. Rubbing alcohol is a mixture. Which of the following best describes the components of rubbing alcohol?
A. They are chemically combined.
B. They are present in fixed proportion.
C. They combine in a definite ratio by mass.
D. They can be separated by physical means.

8. At sea level, an odorless and colorless Liquid “B” boils at 100°C and melts at 0°C. What inference can be drawn from this observation?
A. Liquid B is homogeneous.
B. Liquid B is a mixture.
C. Liquid B is heterogeneous.
D. Liquid B is a pure substance.

9. Mixtures can be classified into two types: homogeneous and heterogeneous. They are different because______.
A. homogeneous looks the same all throughout, while heterogeneous you can see the different components.
B. heterogeneous looks the same throughout, while homogeneous you can see the different parts
C. Heterogeneous has two substances while homogeneous has three or more substances
D. they are the same, just different names

10. Mixture is____.
A. a combination of substances in which the atoms of the substance do not chemically combine
B. a combination of substances where new substances are formed through a reaction
C. a combination of elements to make a new substance
D. a chemically combined substance ​