Question 1

The number of atoms in one formula unit of the substance, CO(NH2)2, is

Accepted Answer

A) 4 
B) 5 
C) 7 
D) 8 
E) 10 
A) 4 
B) 5 
C) 7 
D) 8 
E) 10

Question 2

Classify the following three elements as a metal, metalloid, or nonmetal: Ti, S, Sb.

Accepted Answer

A) Ti, metal; S, metalloid; Sb, nonmetal 
B) Sb, metal; S, metalloid; Ti, nonmetal 
C) S, metal; Sb, metalloid; Ti, nonmetal 
D) Sb, metal; Ti, metalloid; S, nonmetal 
E) Ti, metal; Sb, metalloid; S, nonmetal 
A) Ti, metal; S, metalloid; Sb, nonmetal 
B) Sb, metal; S, metalloid; Ti, nonmetal 
C) S, metal; Sb, metalloid; Ti, nonmetal 
D) Sb, metal; Ti, metalloid; S, nonmetal 
E) Ti, metal; Sb, metalloid; S, nonmetal

Question 3

Which compound exists as a diatomic molecule in its free state?

Accepted Answer

A) C 
B) N 
C) Ga 
D) Ge 
E) P 
A) C 
B) N 
C) Ga 
D) Ge 
E) P

Question 4

Each statement accurately describes the noble gases except for which one?

Accepted Answer

A) They were once known as the inert gases. 
B) He, Ne, Ar, Kr, Xe, Rn, and Uuo are part of the group. 
C) Their heavier elements do react with other elements. 
D) They belong to group VIIIA (or 18). 
E) They contain at least one metalloid. 
A) They were once known as the inert gases. 
B) He, Ne, Ar, Kr, Xe, Rn, and Uuo are part of the group. 
C) Their heavier elements do react with other elements. 
D) They belong to group VIIIA (or 18). 
E) They contain at least one metalloid.

Question 5

Which of the following is the correct formula for the hydrocarbon hexane?

Accepted Answer

A) CH4 
B) C2H4 
C) CH6 
D) C6H14 
E) C2H5OH 
A) CH4 
B) C2H4 
C) CH6 
D) C6H14 
E) C2H5OH

Question 6

The correct formula for the compound formed from the lithium ion and PO43- is ________.

Accepted Answer

Question 7

How many silicon and oxygen atoms are in the formula, Ca3Mg5(Si4O11)2(OH)2?

Accepted Answer

A) 3 Si, 5 O 
B) 8 Si, 24 O 
C) 4 Si, 11 O 
D) 2 Si, 2 O 
E) 5 Si, 3 O 
A) 3 Si, 5 O 
B) 8 Si, 24 O 
C) 4 Si, 11 O 
D) 2 Si, 2 O 
E) 5 Si, 3 O

Question 8

What is the formula for cobalt(III)dihydrogen phosphate?

Accepted Answer

A) Co3HPO4 
B) Co2H(PO4)3 
C) Co(H2PO4) 
D) Co(H2PO4)3 
E) CoH3PO4 
A) Co3HPO4 
B) Co2H(PO4)3 
C) Co(H2PO4) 
D) Co(H2PO4)3 
E) CoH3PO4

Question 9

What is the name of the following compound: V3(PO4)4?

Accepted Answer

vanadium(I

Question 10

What is the formula for the compound named hydrogen sulfide?

Accepted Answer

The answer of What is the formula for the compound...

Question 11

What formula is used to represent molecular chlorine?

Accepted Answer

The answer of What formula is used to represent molecular...

Question 12

What is the name of the following compound: Cr2(SO4)3?

Accepted Answer

chromium(I

Question 13

Select the examples in which the names do not correctly match the formulas of the compounds indicated.   Hint: Write the correct name of each formula without looking at the names and then compare it to the choices.

Accepted Answer

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

Question 14

Which compound is correctly written as a hydride?

Accepted Answer

A) CoCl2·6H2O 
B) HC2H3O2 
C) NaOH 
D) CaH2 
E) C6H12O6 
A) CoCl2·6H2O 
B) HC2H3O2 
C) NaOH 
D) CaH2 
E) C6H12O6

Question 15

Which element is a halogen?

Accepted Answer

A) Te 
B) O 
C) Se 
D) Uuh 
E) I 
A) Te 
B) O 
C) Se 
D) Uuh 
E) I

Question 16

What is the formula for the sulfide ion?

Accepted Answer

The answer of What is the formula for the sulfide...

Question 17

To show how atoms are connected in certain compounds, the chemical symbols are used to represent the atoms, and dashes are used to indicate the chemical bonds. The resulting formula is therefore referred to as ________.

Accepted Answer

a structur

Question 18

Through analysis it was found that an unknown molecule contains 19.8 g of nitrogen for every 65.0 g of the molecule. How many grams of nitrogen would 1.35 grams of the molecule contain? Hint: Use the masses of the elements to find the ratio of the elements.

Accepted Answer

A) 0.305 g 
B) 3.28 g 
C) 0.411 g 
D) 0.0681 g 
E) 0.226 g 
A) 0.305 g 
B) 3.28 g 
C) 0.411 g 
D) 0.0681 g 
E) 0.226 g

Question 19

What is the formula for the compound iron(II)sulfate?

Accepted Answer

A) FeSO4 
B) Fe(SO4)2 
C) Fe2SO4 
D) Fe2(SO4)3 
E) Fe3(SO4)2 
A) FeSO4 
B) Fe(SO4)2 
C) Fe2SO4 
D) Fe2(SO4)3 
E) Fe3(SO4)2

Question 20

How many protons, neutrons, and electrons are in the ion, 129Te2-?

Accepted Answer

A) 52 protons, 77 neutrons, and 50 electrons 
B) 53 protons, 76 neutrons, and 55 electrons 
C) 52 protons, 77 neutrons, and 54 electrons 
D) 50 protons, 79 neutrons, and 52 electrons 
E) 51 protons, 78 neutrons, and 53 electrons 
A) 52 protons, 77 neutrons, and 50 electrons 
B) 53 protons, 76 neutrons, and 55 electrons 
C) 52 protons, 77 neutrons, and 54 electrons 
D) 50 protons, 79 neutrons, and 52 electrons 
E) 51 protons, 78 neutrons, and 53 electrons

Exam 3: Elements, Compounds, and the Periodic Table

The number of atoms in one formula unit of the substance, CO(NH2)2, is

Classify the following three elements as a metal, metalloid, or nonmetal: Ti, S, Sb.

Which compound exists as a diatomic molecule in its free state?

Each statement accurately describes the noble gases except for which one?

Which of the following is the correct formula for the hydrocarbon hexane?

The correct formula for the compound formed from the lithium ion and PO43- is ________.

How many silicon and oxygen atoms are in the formula, Ca3Mg5(Si4O11)2(OH)2?

What is the formula for cobalt(III)dihydrogen phosphate?

What is the name of the following compound: V3(PO4)4?

What is the formula for the compound named hydrogen sulfide?

What formula is used to represent molecular chlorine?

What is the name of the following compound: Cr2(SO4)3?

Select the examples in which the names do not correctly match the formulas of the compounds indicated. Hint: Write the correct name of each formula without looking at the names and then compare it to the choices.

Which compound is correctly written as a hydride?

Which element is a halogen?

What is the formula for the sulfide ion?

To show how atoms are connected in certain compounds, the chemical symbols are used to represent the atoms, and dashes are used to indicate the chemical bonds. The resulting formula is therefore referred to as ________.

Through analysis it was found that an unknown molecule contains 19.8 g of nitrogen for every 65.0 g of the molecule. How many grams of nitrogen would 1.35 grams of the molecule contain? Hint: Use the masses of the elements to find the ratio of the elements.

What is the formula for the compound iron(II)sulfate?

How many protons, neutrons, and electrons are in the ion, 129Te2-?

A Very Brief History of Chemistry

Scientific Measurements

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Mixtures at the Molecular Level: Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

The number of atoms in one formula unit of the substance, CO(NH₂)₂, is

The correct formula for the compound formed from the lithium ion and PO₄^3-is ________.

How many silicon and oxygen atoms are in the formula, Ca₃Mg₅(Si₄O₁₁)₂(OH)₂?

What is the name of the following compound: V₃(PO₄)₄?

What is the name of the following compound: Cr₂(SO₄)₃?

How many protons, neutrons, and electrons are in the ion, ¹²⁹Te^2-?