Question 1

Match the following.
-calcium

Accepted Answer

A) Ne(g) 
B) Cl2(g) 
C) Ca2(s) 
D) Ne2(g) 
E) Ca(s)
F)H2(g)
G)I2(s)
H)H(g)
I)Cl(g)
J)O(g)
K)O2(g)
L)I(s) 
A) Ne(g) 
B) Cl2(g) 
C) Ca2(s) 
D) Ne2(g) 
E) Ca(s)
F)H2(g)
G)I2(s)
H)H(g)
I)Cl(g)
J)O(g)
K)O2(g)
L)I(s) E

Question 2

Identify the charge, X, on the acetate ion       .

Accepted Answer

A)  +1 
B)  +2 
C)  +3 
D)  -2 
E)  -1 
A)  +1 
B)  +2 
C)  +3 
D)  -2 
E)  -1 E

Question 3

What is the chemical formula for magnesium hydride?

Accepted Answer

A)  MgH2 
B)  MgOH 
C)  MgOH2 
D)  Mg(OH)2 
A)  MgH2 
B)  MgOH 
C)  MgOH2 
D)  Mg(OH)2 A

Question 4

Which of the following has the smallest mass?

Accepted Answer

A)  3.50 × 1023 molecules of I2 
B)  85.0 g of Cl2 
C)  2.50 mol of F2 
D)  0. 050 kg of Br2 
A)  3.50 × 1023 molecules of I2 
B)  85.0 g of Cl2 
C)  2.50 mol of F2 
D)  0. 050 kg of Br2

Question 5

Define empirical formula.

Accepted Answer

An empirical formula

Question 6

Identify the cyanide ion.

Accepted Answer

A)    
B)  H   
C)    
D)  HCN 
E)  CN- 
A)    
B)  H   
C)    
D)  HCN 
E)  CN-

Question 7

Identify the formula for barium hydroxide octahydrate.

Accepted Answer

A)  Ba(OH)2∙8H2O 
B)  BaOH∙8H2O 
C)  B(OH)3∙8H2O 
D)  8Ba(OH)2∙H2O 
E)  8BaOH∙H2O 
A)  Ba(OH)2∙8H2O 
B)  BaOH∙8H2O 
C)  B(OH)3∙8H2O 
D)  8Ba(OH)2∙H2O 
E)  8BaOH∙H2O

Question 8

Formaldehyde, CH2O, is the simplest aldehyde and is commonly used as an embalming fluid. Calculate the mass of 8.16 × 1024 molecules of formaldehyde.

Accepted Answer

A)  451 g 
B)  407 g 
C)  0.451 g 
D)  246 g 
E)  24.6 g 
A)  451 g 
B)  407 g 
C)  0.451 g 
D)  246 g 
E)  24.6 g

Question 9

What is the structure of the covalent compound formed by nitrogen and oxygen? Is this the only possibility? Explain.

Accepted Answer

Since nitrogen and oxygen are

Question 10

In which set do all elements tend to form anions in binary ionic compounds?

Accepted Answer

A)  C, S, Pb 
B)  K, Fe, Br 
C)  Li, Na, K 
D)  N, O, I 
A)  C, S, Pb 
B)  K, Fe, Br 
C)  Li, Na, K 
D)  N, O, I

Question 11

Which of the following compounds is ethanol?

Accepted Answer

A)  C2H6 
B)  C2H5OH 
C)  CH3CO2H 
D)  CH3CO2CH3 
E)  CH3-O-CH3 
A)  C2H6 
B)  C2H5OH 
C)  CH3CO2H 
D)  CH3CO2CH3 
E)  CH3-O-CH3

Question 12

Identify the formula for barium nitrite.

Accepted Answer

A)  Ba3N2 
B)  BaNO3 
C)  BN 
D)  Ba(NO2)2 
E)  B(NO2)3 
A)  Ba3N2 
B)  BaNO3 
C)  BN 
D)  Ba(NO2)2 
E)  B(NO2)3

Question 13

Calculate the molar mass of Ca3(PO4)2.

Accepted Answer

A)  87.05 g mol-1 
B)  215.21 g mol-1 
C)  310.18 g mol-1 
D)  279.21 g mol-1 
E)  246.18 g mol-1 
A)  87.05 g mol-1 
B)  215.21 g mol-1 
C)  310.18 g mol-1 
D)  279.21 g mol-1 
E)  246.18 g mol-1

Question 14

Which of the following is an atomic element?

Accepted Answer

A)  Br 
B)  H 
C)  N 
D)  O 
E)  Mg 
A)  Br 
B)  H 
C)  N 
D)  O 
E)  Mg

Question 15

Which one of the following is not an empirical formula?

Accepted Answer

A)  CHO 
B)  CH2O 
C)  C2H4O 
D)  C2H4O2 
A)  CHO 
B)  CH2O 
C)  C2H4O 
D)  C2H4O2

Question 16

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O. What is the empirical formula of the alcohol?

Accepted Answer

Question 17

Identify the formula for copper (II) sulfate pentahydrate.

Accepted Answer

A)  Cu2SO3∙H5 
B)  Cu2S∙H2O 
C)  CuS∙5H2O 
D)  (CuSO4)5 
E)  CuSO4∙5H2O 
A)  Cu2SO3∙H5 
B)  Cu2S∙H2O 
C)  CuS∙5H2O 
D)  (CuSO4)5 
E)  CuSO4∙5H2O

Question 18

Determine the name for N2O5.

Accepted Answer

A)  dinitrogen pentoxide 
B)  nitrogen oxide 
C)  nitrogen(IV) oxide 
D)  nitrogen(II) oxide 
E)  nitrogen tetroxide 
A)  dinitrogen pentoxide 
B)  nitrogen oxide 
C)  nitrogen(IV) oxide 
D)  nitrogen(II) oxide 
E)  nitrogen tetroxide

Question 19

Which of the following exists as a polyatomic molecule?

Accepted Answer

A)  He 
B)  C 
C)  P 
D)  Na 
E)  Ne 
A)  He 
B)  C 
C)  P 
D)  Na 
E)  Ne

Question 20

Identify the compound with (a) covalent bond(s).

Accepted Answer

A)  CH4 
B)  CaCl2 
C)  KBr 
D)  MgCl2 
E)  NaCl 
A)  CH4 
B)  CaCl2 
C)  KBr 
D)  MgCl2 
E)  NaCl

Exam 3: Molecules, Compounds, and Nomenclature

Match the following. -calcium

Identify the charge, X, on the acetate ion .

What is the chemical formula for magnesium hydride?

Which of the following has the smallest mass?

Define empirical formula.

Identify the cyanide ion.

Identify the formula for barium hydroxide octahydrate.

Formaldehyde, CH2O, is the simplest aldehyde and is commonly used as an embalming fluid. Calculate the mass of 8.16 × 1024 molecules of formaldehyde.

What is the structure of the covalent compound formed by nitrogen and oxygen? Is this the only possibility? Explain.

In which set do all elements tend to form anions in binary ionic compounds?

Which of the following compounds is ethanol?

Identify the formula for barium nitrite.

Calculate the molar mass of Ca3(PO4)2.

Which of the following is an atomic element?

Which one of the following is not an empirical formula?

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O. What is the empirical formula of the alcohol?

Identify the formula for copper (II) sulfate pentahydrate.

Determine the name for N2O5.

Which of the following exists as a polyatomic molecule?

Identify the compound with (a) covalent bond(s).

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry Ii: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Formaldehyde, CH₂O, is the simplest aldehyde and is commonly used as an embalming fluid. Calculate the mass of 8.16 × 10²⁴ molecules of formaldehyde.

Calculate the molar mass of Ca₃(PO₄)₂.

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO₂ and 58.70 g of H₂O. What is the empirical formula of the alcohol?

Determine the name for N₂O₅.