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How many atoms of carbon are in the following compound? CH3(CH2) 12COOH


A) 12
B) 13
C) 14
D) 16

Correct Answer

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Based on the definition of a pure substance given in your book, which of the following could be classified as pure substances?


A) the air you breathe
B) the water from a water fountain
C) a milkshake
D) chicken noodle soup
E) a diamond

Correct Answer

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Which of the following would be considered a physical change?


A) the metabolism of food
B) an apple turning brown when left on the counter
C) solid dry ice making "smoke"
D) a chain rusting

Correct Answer

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Identify the alkaline earth metal.


A) Na
B) Zn
C) Ca
D) C
E) Cl

Correct Answer

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Would the evaporation of water from a mixture of salt water be considered a chemical change?


A) Yes, since the water is separating chemically from the salt.
B) Perhaps.It would depend if the salt changed color once all the water was gone.
C) No, since the water is just changing phases, this is simply a physical change.
D) Yes, since they would each have different properties once they were separated.

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Which one is chemical change?


A) a puddle freezing
B) a marshmallow turning brown when roasted
C) the alcohol in a bottle of rubbing alcohol disappearing when the lid is not put on after use
D) ice on the sidewalk melting after salt has been sprinkled on it

Correct Answer

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The main reason that gold mining is one of the dirtiest mining activities is that


A) only a few ounces of gold are recovered for each ton of rock mined.
B) many chemicals must be used to extract gold from the earth.
C) gold is only found deep underground.Digging tunnels creates a lot of dirt.
D) gold is only found in remote areas so mining it contributes significantly to emission of carbon dioxide because of the distances that miners must travel.

Correct Answer

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How many atoms of oxygen are in the following compound? Ca3(PO4) 2


A) 2
B) 4
C) 6
D) 8

Correct Answer

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Which of the three phases of matter expand to completely fill its container?


A) the liquid phase
B) the solid phase
C) the gas phase
D) both the liquid and gas phases

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When water transitions from a liquid to a gas, which of the following statements is false?


A) The liquid molecules took on the shape of their container.
B) The gas molecules are further apart than the liquid molecules were.
C) The gas molecules expand to fill their container.
D) The liquid molecules were all at the very top of the container before they transitioned to a gas.

Correct Answer

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