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How many silicon atoms (Si) are contained in a 12.5 g sample of silicon?


A) 2.68 * 1023
B) 5.83 *10-22
C) 1.35 *1024
D) 1.71 * 1021

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A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?


A)
A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus? A) B) C) D)
B)
A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus? A) B) C) D)
C)
A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus? A) B) C) D)
D)
A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus? A) B) C) D)

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The symbols for all of the elements always begin with a capital letter.

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What is meant when the symbol C-12 (or 12C) is used?


A) the carbon atom weighs 12 grams
B) the carbon atom weighs 12 pounds
C) the carbon atom weighs 12 amu
D) the melting point of carbon is 12°C

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How many atoms are contained in a sample of krypton,Kr,that weighs 8.38 g?


A) one Avogadro's number
B) one-tenth Avogadro's number
C) one
D) one-tenth

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The number of Cr atoms in a 26.0 g sample of chromium is x.How many atoms,expressed in terms of x,would be contained in 26.98 g of aluminum (Al) ?


A) x
B) x/2
C) 2x
D) x+2

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A molecular formula


A) is represented using the symbols of the elements in the formula.
B) is represented using a system of circles that contain different symbols.
C) cannot be represented conveniently using symbols for the elements.
D) is represented using words rather than symbols.

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Determine the molecular weight of hydrogen peroxide,H2O2,in u (or amu) .


A) 17.01
B) 18.02
C) 34.02
D) 33.01

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What is the reason that U-238 is different from U-235?


A) three more electrons
B) three more protons
C) three more neutrons
D) there is no difference

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