Question 1

Which of the following is not the correct name for the formula given?

Accepted Answer

A)   HClO hypochlorus acid
B)   Cr2S3 chromium(III) sulfide
C)   PCl5 phosphoruspentachloride
D)   CoO cobalt(II)  oxide
E)   CaSO3 calciumsulfate

Question 2

According to the law of definite proportions,

Accepted Answer

A)   the ratio of the masses of the elements in a compound is always the same.
B)   it is not possible for the same two elements to form more than one compound.
C)   if the same two elements form two different compounds, they do so in the same ratio.
D)   the total mass after a chemical change is the same as before the change.

Question 3

Write the names of the following compounds:

Accepted Answer

a) iron(II) sulfate
b) sodium ...

Question 4

An ion is formed
i.by either adding protons to or subtracting protons from the atom.II.by either adding electrons to or subtracting electrons from the atom.III.by either adding neutrons to or subtracting neutrons from the atom.

Accepted Answer

A)   Only I is true.
B)   Only II is true.
C)   Only III is true.
D)   All of the statements are true.
E)   Two of the statements are true.

Question 5

Select the group of symbols that would correctly complete the following statements, respectively.___ is the heaviest noble gas.___ is the transition metal that has 24 electrons as a 3+ ion.___ is the halogen in the third period.___ is the alkaline earth metal that has 18 electrons as a stable ion.

Accepted Answer

A)   Rn, Cr, Br, Ca
B)   Ra, Sc, Br, K
C)   Ra, Co, Cl, K
D)   Rn, Co, Cl, Ca

Question 6

Which one of the following statements about atomic structure is false?

Accepted Answer

A)   Almost all of the mass of the atom is concentrated in the nucleus.
B)   The protons and neutrons in the nucleus are very tightly packed.
C)   The number of protons and the number of neutrons are always the same in the neutral atom.
D)   The electrons occupy a very large volume compared to the nucleus.

Question 7

Which of the following is not the correct chemical formula for the compound named?

Accepted Answer

A)   Na(OH) 2 sodium hydroxide
B)   Mg(C2H3O2) 2 magnesium acetate
C)   ZnS zinc sulfide
D)   Fe2O3 iron(III)  oxide
E)   KCN potassium cyanide

Question 8

Which of the following statements is(are)  true?
i.The number of protons is the same for all neutral atoms of an element.II.The number of electrons is the same for all neutral atoms of an element.III.The number of neutrons is the same for all neutral atoms of an element.

Accepted Answer

A)   I, II, and III are all true.
B)   I, II, and III are all false.
C)   Only I and II are true.
D)   Only I and III are true.
E)   Only II and III are true.

Question 9

Which of the following atomic symbols is incorrect?

Accepted Answer

A)   (3115P) 
B)   (199F) 
C)   (3417Cl) 
D)   (3919K) 
E)   (158
C)  ​

Question 10

Which of the following statements is(are)  true?
i.O and F have the same number of neutrons.II.C and N are isotopes of each other because their mass numbers are the same.III.O2- has the same number of electrons as Ne.

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I and II only
E)   I and III only

Question 11

​Which of the following gases was discovered by Joseph Priestley?

Accepted Answer

A)   ​Neon gas
B)   ​Oxygen gas
C)   Methane gas
D)   Ammonia gas
E)   ​Helium gas

Question 12

Name the following compounds:
-HNO3

Accepted Answer

Question 13

Name the following compounds:
-SnI2

Accepted Answer

Question 14

The element rhenium (Re)  exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus

Accepted Answer

A)   75 protons, 110 neutrons.
B)   75 protons, 75 neutrons.
C)   75 protons, 130 neutrons.
D)   130 protons, 75 neutrons.
E)   not enough information is given.

Question 15

How many of the following did Dalton not discuss in his atomic theory?
I.isotopes
II.ions
III.protons
IV.neutrons
V.electrons

Accepted Answer

A)   2
B)   5
C)   4
D)   1
E)   3

Question 16

Write the formula for:
-iron(III) oxide

Accepted Answer

The answer of Write the formula for:
-iron(III) oxide...

Question 17

Name the following compounds:
-Al2(SO4)3

Accepted Answer

Question 18

Write the formula for:
-dinitrogen trioxide

Accepted Answer

The answer of Write the formula for:
-dinitrogen trioxide...

Question 19

An isotope of an element is formed
i.by adding protons to, or removing protons from, the atom.II.by adding neutrons to, or removing neutrons from, the atom.III.by adding electrons to, or removing electrons from, the atom.

Accepted Answer

A)   Only I is true
B)   Only II is true
C)   Only III is true
D)   All of the statements are true
E)   Two of the statements are true

Question 20

The ion 14N3- has

Accepted Answer

A)   7 protons, 7 neutrons, 4 electrons
B)   7 protons, 7 neutrons,3 electrons
C)   7 protons, 14 neutrons, 7 electrons
D)   7 protons, 7neutrons, 10 electrons
E)   7 protons, 7 neutrons, 7 electrons

Exam 2: Atoms, Molecules, and Ions

An ion is formed i.by either adding protons to or subtracting protons from the atom.II.by either adding electrons to or subtracting electrons from the atom.III.by either adding neutrons to or subtracting neutrons from the atom.

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Which of the following statements is(are) true? i.The number of protons is the same for all neutral atoms of an element.II.The number of electrons is the same for all neutral atoms of an element.III.The number of neutrons is the same for all neutral atoms of an element.

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Name the following compounds: -SnI2

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Name the following compounds: -Al2(SO4)3

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Write the formula for: -dinitrogen trioxide

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Which of the following is not the correct chemical formula for the compound named?

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Which of the following is not the correct name for the formula given?

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​Which of the following gases was discovered by Joseph Priestley?

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According to the law of definite proportions,

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An isotope of an element is formed i.by adding protons to, or removing protons from, the atom.II.by adding neutrons to, or removing neutrons from, the atom.III.by adding electrons to, or removing electrons from, the atom.

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Name the following compounds: -HNO3

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Which of the following atomic symbols is incorrect?

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Write the formula for: -iron(III) oxide

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Write the names of the following compounds:

Correct Answerverifieda) iron(II) sulfateb) sodium ...View AnswerShow Answer

The ion 14N3- has

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The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus

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Which of the following statements is(are) true? i.O and F have the same number of neutrons.II.C and N are isotopes of each other because their mass numbers are the same.III.O2- has the same number of electrons as Ne.

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Which one of the following statements about atomic structure is false?

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Select the group of symbols that would correctly complete the following statements, respectively.___ is the heaviest noble gas.___ is the transition metal that has 24 electrons as a 3+ ion.___ is the halogen in the third period.___ is the alkaline earth metal that has 18 electrons as a stable ion.

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How many of the following did Dalton not discuss in his atomic theory? I.isotopes II.ions III.protons IV.neutrons V.electrons

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Name the following compounds: -SnI₂

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Name the following compounds: -Al₂(SO₄)₃

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Which of the following gases was discovered by Joseph Priestley?

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Name the following compounds: -HNO₃

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a) iron(II) sulfate
b) sodium ...
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The ion ¹⁴N^3- has

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Which of the following statements is(are) true? i.O and F have the same number of neutrons.II.C and N are isotopes of each other because their mass numbers are the same.III.O^2- has the same number of electrons as Ne.

Correct Answer
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Select the group of symbols that would correctly complete the following statements, respectively._ is the heaviest noble gas._ is the transition metal that has 24 electrons as a 3+ ion._ is the halogen in the third period._ is the alkaline earth metal that has 18 electrons as a stable ion.

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Correct Answer
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