Question 1

The formula of water,H2O,suggests:

Accepted Answer

A)  There is twice as much mass of hydrogen as oxygen in each molecule.
B)  There are two hydrogen atoms and one oxygen atom per water molecule.
C)  There is twice as much mass of oxygen as hydrogen in each molecule.
D)  There are two oxygen atoms and one hydrogen atom per water molecule.
E)  None of these.F) B) and D)
G) B) and E)

Question 2

Name the following compounds:
-NH4NO3

Accepted Answer

Question 3

Write the symbol for each of the following elements.
a)
silver
_____________
b)
calcium
_____________
c)
iodine
_____________
d)
copper
_____________
e)
phosphorus
_____________

Accepted Answer

a)Ag,
b)Ca...

Question 4

Many classic experiments have given us indirect evidence of the nature of the atom.Which of the experiments listed below did not give the results described?

Accepted Answer

A)  The Rutherford experiment proved the Thomson "plum-pudding" model of the atom to be essentially correct.
B)  The Rutherford experiment was useful in determining the nuclear charge on the atom.
C)  Millikan's oil-drop experiment showed that the charge on any particle was a simple multiple of the charge on the electron.
D)  The electric discharge tube proved that electrons have a negative charge.
E)  All of the above experiments gave the results described.F) C) and E)
G) B) and E)

Question 5

Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes.An atom of bromine-79 contains

Accepted Answer

A)  35 protons,44 neutrons,35 electrons
B)  34 protons and 35 electrons,only
C)  44 protons,44 electrons,and 35 neutrons
D)  35 protons,79 neutrons,and 35 electrons
E)  79 protons,79 electrons,and 35 neutronsF) A) and B)
G) None of the above

Question 6

The first people to attempt to explain why chemical changes occur were

Accepted Answer

A)  alchemists
B)  metallurgists
C)  physicians
D)  physicists
E)  the GreeksF) A) and B)
G) C) and D)

Question 7

How many oxygen atoms are there in 4 formula units of Al2(CO3) 3?

Accepted Answer

A)  9
B)  24
C)  36
D)  13
E)  39F) B) and E)
G) A) and E)

Question 8

Which of the following are incorrectly paired?

Accepted Answer

A)  Copper,Cu
B)  Carbon,C
C)  Cobalt,Co
D)  Calcium,Ca
E)  Cesium,CeF) B) and E)
G) A) and D)

Question 9

The formula for sodium dihydrogen phosphate is

Accepted Answer

A)  NaH2PO4
B)  Na(HPO4) 2
C)  NaHPO4
D)  Na2HPO4
E)  Na2H2PO4F) A) and B)
G) B) and D)

Question 10

Name the following compounds:
-K2Cr2O7

Accepted Answer

potassium ...

Question 11

How many protons and electrons does the most stable ion for oxygen have? # protons
# electrons

Accepted Answer

A)  10 p 8 e
B)  8 p 6 e
C)  6 p 8 e
D)  8 p 8 e
E)  8 p 10 eF) C) and D)
G) A) and D)

Question 12

The correct name for V3+ is

Accepted Answer

A)  vanadide
B)  vanadite ion
C)  vanadium(III) ion
D)  vanadium(V) ion
E)  trivanadium ionF) A) and E)
G) B) and D)

Question 13

The correct name for FeO is

Accepted Answer

A)  iron oxide
B)  iron(II) oxide
C)  iron(III) oxide
D)  iron monoxide
E)  iron(I) oxideF) A) and B)
G) C) and E)

Question 14

The correct name for Ca2+ is

Accepted Answer

A)  calcium
B)  calcium(II) ion
C)  calcium ion
D)  calcium(I) ion
E)  monocalcium ionF) C) and E)
G) A) and E)

Question 15

If the Thomson model of the atom had been correct,Rutherford would have observed:

Accepted Answer

A)  Alpha particles going through the foil with little or no deflection.
B)  Alpha particles greatly deflected by the metal foil.
C)  Alpha particles bouncing off the foil.
D)  Positive particles formed in the foil.
E)  None of the above observations is consistent with the Thomson model of the atom.F) B) and C)
G) A) and E)

Question 16

Write the formula for:
-phosphorus trichloride

Accepted Answer

The answer of Write the formula for:
-phosphorus trichloride...

Question 17

According to the law of multiple proportions:

Accepted Answer

A)  If the same two elements form two different compounds,they do so in the same ratio.
B)  It is not possible for the same two elements to form more than one compound.
C)  The ratio of the masses of the elements in a compound is always the same.
D)  The total mass after a chemical change is the same as before the change.
E)  None of these.F) B) and C)
G) B) and E)

Question 18

The first scientist to show that atoms emit any negative particles was

Accepted Answer

A)  J.J.Thomson
B)  Lord Kelvin
C)  Ernest Rutherford
D)  William Thomson
E)  John DaltonF) B) and E)
G) A) and B)

Question 19

The number of electrons in an atom is the same for all neutral atoms of that element.

Accepted Answer

A) True 
 B)False

Question 20

Which among the following represent a set of isotopes? Atomic nuclei containing:
I.20 protons and 20 neutrons
II.21 protons and 19 neutrons
III.22 neutrons and 18 protons
IV.20 protons and 22 neutrons
V.21 protons and 20 neutrons

Accepted Answer

A)  I,II,III
B)  III,IV
C)  I,V
D)  I,IV and II,V
E)  No isotopes are indicated.F) D) and E)
G) All of the above

Exam 2: Atoms, molecules, and Ions

Name the following compounds: -K2Cr2O7

Correct Answerverifiedpotassium ...View AnswerShow Answer

How many oxygen atoms are there in 4 formula units of Al2(CO3) 3?

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Bromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes.An atom of bromine-79 contains

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Name the following compounds: -NH4NO3

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According to the law of multiple proportions:

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The first scientist to show that atoms emit any negative particles was

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The formula for sodium dihydrogen phosphate is

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Which of the following are incorrectly paired?

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Write the formula for: -phosphorus trichloride

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The formula of water,H2O,suggests:

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The first people to attempt to explain why chemical changes occur were

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The number of electrons in an atom is the same for all neutral atoms of that element.

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Which among the following represent a set of isotopes? Atomic nuclei containing: I.20 protons and 20 neutrons II.21 protons and 19 neutrons III.22 neutrons and 18 protons IV.20 protons and 22 neutrons V.21 protons and 20 neutrons

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How many protons and electrons does the most stable ion for oxygen have? # protons # electrons

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The correct name for Ca2+ is

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Write the symbol for each of the following elements. a) silver _____________ b) calcium _____________ c) iodine _____________ d) copper _____________ e) phosphorus _____________

Correct Answerverifieda)Ag,b)Ca...View AnswerShow Answer

If the Thomson model of the atom had been correct,Rutherford would have observed:

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Many classic experiments have given us indirect evidence of the nature of the atom.Which of the experiments listed below did not give the results described?

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The correct name for V3+ is

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The correct name for FeO is

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Name the following compounds: -K₂Cr₂O₇

Correct Answer
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potassium ...
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How many oxygen atoms are there in 4 formula units of Al₂(CO₃) ₃?

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Name the following compounds: -NH₄NO₃

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The formula of water,H₂O,suggests:

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The correct name for Ca²⁺ is

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Write the symbol for each of the following elements. a) silver _______ b) calcium _ c) iodine _ d) copper _ e) phosphorus _______

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a)Ag,
b)Ca...
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The correct name for V³⁺ is

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