Question 1

Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has

Accepted Answer

A)  an atomic number of 21 and a mass number of 42.
B)  an atomic number of 20 and a mass number of 40.
C)  22 neutrons and 20 protons.
D)  22 protons and 20 neutrons.

Question 2

Nuclei that are in the band of stability have a neutron/proton ratio ________ (equal to,greater than,less than)1:1.

Accepted Answer

The answer of Nuclei that are in the band of...

Question 3

One mole of which element has the smallest mass?

Accepted Answer

A)  Co
B)  Cu
C)  Ni
D)  Zn

Question 4

"Isotopes" are atoms with the same number of ________ but different number of ________.

Accepted Answer

A)  electrons,protons
B)  neutrons,protons
C)  protons,electrons
D)  protons,neutrons

Question 5

The definitive distinction between ionic bonding and covalent bonding is that

Accepted Answer

A)  ionic bonding involves a sharing of electrons and covalent bonding involves a transfer of electrons.
B)  ionic bonding involves a transfer of electrons and covalent bonding involves a sharing of electrons.
C)  ionic bonding requires two nonmetals and covalent bonding requires a metal and a nonmetal.
D)  covalent bonding requires two nonmetals and ionic bonding requires a metal and a nonmetal.

Question 6

The charge to mass ratio of an electron was determined from Rutherford's cathode-ray tube experiment to be 1.759 × 108 C/g and the charge on a single electron was determined from the Millikan oil drop experiment to be 1.602 × 10-19 C,so the mass of a single electron is ________.

Accepted Answer

Question 7

The number of electrons in the ion C4- is ________.

Accepted Answer

Question 8

The symbol for technetium-98 is ________.

Accepted Answer

The answer of The symbol for technetium-98 is ________....

Question 9

The chemical formula for the sulfite ion is

Accepted Answer

A)  S-.
B)  S 2-.
C)  SO32-.
D)  SO42-.

Question 10

In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. 3(PO4) 2? A) drawing (a)  B) drawing (b)  C) drawing (c)  D) drawing (d) " class="answers-bank-image d-inline" rel="preload" >
-Which drawing represents the ionic compound Mg3(PO4) 2?

Accepted Answer

A)  drawing (a) 
B)  drawing (b) 
C)  drawing (c) 
D)  drawing (d)

Question 11

Boron-9 can be represented as

Accepted Answer

A)   . 
B)     . 
C)     . 
D)     ." class="answers-bank-image d-inline" rel="preload" > .
B)   . 
B)     . 
C)     . 
D)     ." class="answers-bank-image d-inline" rel="preload" > .
C)   . 
B)     . 
C)     . 
D)     ." class="answers-bank-image d-inline" rel="preload" > .
D)   . 
B)     . 
C)     . 
D)     ." class="answers-bank-image d-inline" rel="preload" > .

Question 12

The chemical formula for nitrous acid is

Accepted Answer

A)  H3N(aq) .
B)  H NO2(aq) .
C)  H NO3(aq) .
D)  H2N2O6(aq) .

Question 13

Beta decay of 32P produces a beta particle and

Accepted Answer

A)  (28Al.) 
B)  (31P.) 
C)  (32Si.) 
D)  (32S.)

Question 14

Chlorine has two common isotopes,chlorine-35 and chlorine-37,and an atomic mass of 35.45 amu.The natural abundance of chlorine-35 is ________ (greater than,less than,the same as)the natural abundance of chlorine-37.

Accepted Answer

The answer of Chlorine has two common isotopes,chlorine-35 and chlorine-37,and...

Question 15

Tritium, ,is formed in the upper atmosphere when Captures a neutron and then decays.What is the other product of this reaction?

Accepted Answer

A)   
B)   
C)   
D)

Question 16

Give the molecular formula corresponding to the following ball-and-stick molecular representation of vitamin C (ascorbic acid) (gray = C,unshaded = H,black = O) .In writing the formula,list the atoms in alphabetical order. 3H4O3 C) C6H4O6 D) C6H8O6" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  CHO
B)  C3H4O3
C)  C6H4O6
D)  C6H8O6

Question 17

+ ion? A) drawing (a)  B) drawing (b)  C) drawing (c)  D) drawing (d) " class="answers-bank-image d-inline" rel="preload" >
-Which of the above drawings represents a K+ ion?

Accepted Answer

A)  drawing (a) 
B)  drawing (b) 
C)  drawing (c) 
D)  drawing (d)

Question 18

A beta particle is

Accepted Answer

A)    .
B)    .
C)    .
D)    .

Question 19

Tell the type of decay process occurring in the following nuclear reaction.

Accepted Answer

A)  α emission
B)  β emission
C)  γ emission
D)  electron capture or positron emission

Question 20

Which of the following is not explained by Dalton's atomic theory?

Accepted Answer

A)  conservation of mass during a chemical reaction
B)  the existence of more than one isotope of an element
C)  the law of definite proportions
D)  the law of multiple proportions

Exam 2: Atoms, molecules, and Ions

The chemical formula for the sulfite ion is

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A beta particle is

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"Isotopes" are atoms with the same number of ________ but different number of ________.

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Chlorine has two common isotopes,chlorine-35 and chlorine-37,and an atomic mass of 35.45 amu.The natural abundance of chlorine-35 is ________ (greater than,less than,the same as)the natural abundance of chlorine-37.

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Beta decay of 32P produces a beta particle and

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Which of the following is not explained by Dalton's atomic theory?

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The chemical formula for nitrous acid is

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In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. -Which drawing represents the ionic compound Mg3(PO4) 2?

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The charge to mass ratio of an electron was determined from Rutherford's cathode-ray tube experiment to be 1.759 × 108 C/g and the charge on a single electron was determined from the Millikan oil drop experiment to be 1.602 × 10-19 C,so the mass of a single electron is ________.

Correct AnswerverifiedShow Answer

Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has

Correct AnswerverifiedShow Answer

Nuclei that are in the band of stability have a neutron/proton ratio ________ (equal to,greater than,less than)1:1.

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One mole of which element has the smallest mass?

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-Which of the above drawings represents a K+ ion?

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Tritium, ,is formed in the upper atmosphere when Captures a neutron and then decays.What is the other product of this reaction?

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The number of electrons in the ion C4- is ________.

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The symbol for technetium-98 is ________.

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Give the molecular formula corresponding to the following ball-and-stick molecular representation of vitamin C (ascorbic acid) (gray = C,unshaded = H,black = O) .In writing the formula,list the atoms in alphabetical order.

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Tell the type of decay process occurring in the following nuclear reaction.

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Boron-9 can be represented as

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The definitive distinction between ionic bonding and covalent bonding is that

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"Isotopes" are atoms with the same number of but different number of .

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Beta decay of ³²P produces a beta particle and

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In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. -Which drawing represents the ionic compound Mg₃(PO₄) ₂?

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The charge to mass ratio of an electron was determined from Rutherford's cathode-ray tube experiment to be 1.759 × 10⁸ C/g and the charge on a single electron was determined from the Millikan oil drop experiment to be 1.602 × 10^-19 C,so the mass of a single electron is ________.

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-Which of the above drawings represents a K⁺ ion?

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The number of electrons in the ion C^4- is ________.

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