Question 1

Potassium forms K+ ions and sulfur forms S2- ions. The formula of potassium sulfide is

Accepted Answer

A)  KS. 
B)  K2S. 
C)  KS2. 
D)  K2S2. 
A)  KS. 
B)  K2S. 
C)  KS2. 
D)  K2S2. B

Question 2

Table salt, NaCl, consists of

Accepted Answer

A)  molecules of Na and Cl with covalent bonds between their atoms. 
B)  molecules of Na and Cl with ionic bonds between their ions. 
C)  crystals of Na and Cl with covalent bonds between their atoms. 
D)  crystals of Na and Cl with ionic bonds between their ions. 
A)  molecules of Na and Cl with covalent bonds between their atoms. 
B)  molecules of Na and Cl with ionic bonds between their ions. 
C)  crystals of Na and Cl with covalent bonds between their atoms. 
D)  crystals of Na and Cl with ionic bonds between their ions. D

Question 3

Which of the following chemical equations is balanced?

Accepted Answer

A)  Fe2O3 + CO → Fe + 2CO2 
B)  Na2SO2 + S → S2O3 + S 
C)  3CuO + 2NH3 → 3Cu + 3H2O + N2 
D)  4Al + 3Fe3O4 → 4Al2O3 + 9Fe 
A)  Fe2O3 + CO → Fe + 2CO2 
B)  Na2SO2 + S → S2O3 + S 
C)  3CuO + 2NH3 → 3Cu + 3H2O + N2 
D)  4Al + 3Fe3O4 → 4Al2O3 + 9Fe C

Question 4

The missing number in the equation 6H3BO3 → H4B6O11 + )H2O is

Accepted Answer

A)  1. 
B)  6. 
C)  7. 
D)  14. 
A)  1. 
B)  6. 
C)  7. 
D)  14.

Question 5

The least active of the following metals is

Accepted Answer

A)  silver. 
B)  potassium. 
C)  zinc. 
D)  copper. 
A)  silver. 
B)  potassium. 
C)  zinc. 
D)  copper.

Question 6

Organic compounds

Accepted Answer

A)  are covalent and contain carbon. 
B)  are covalent and may contain carbon. 
C)  contain carbon and may be covalent. 
D)  may contain carbon and may be covalent. 
A)  are covalent and contain carbon. 
B)  are covalent and may contain carbon. 
C)  contain carbon and may be covalent. 
D)  may contain carbon and may be covalent.

Question 7

The number of compounds that carbon and oxygen can form is

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
A)  1. 
B)  2. 
C)  3. 
D)  4.

Question 8

The most active of the following nonmetals is

Accepted Answer

A)  oxygen. 
B)  fluorine. 
C)  sulfur. 
D)  helium. 
A)  oxygen. 
B)  fluorine. 
C)  sulfur. 
D)  helium.

Question 9

The most abundant element in the universe is

Accepted Answer

A)  hydrogen. 
B)  helium. 
C)  oxygen. 
D)  carbon. 
A)  hydrogen. 
B)  helium. 
C)  oxygen. 
D)  carbon.

Question 10

The number of atoms in a molecule of ammonium sulfide, NH4)2S, is

Accepted Answer

A)  3. 
B)  6. 
C)  10. 
D)  11. 
A)  3. 
B)  6. 
C)  10. 
D)  11.

Question 11

Which of the following is a heterogeneous mixture?

Accepted Answer

A)  seawater 
B)  salt 
C)  soil 
D)  gasoline 
A)  seawater 
B)  salt 
C)  soil 
D)  gasoline

Question 12

Which of the following is a compound?

Accepted Answer

A)  ice 
B)  granite 
C)  helium 
D)  milk 
A)  ice 
B)  granite 
C)  helium 
D)  milk

Question 13

A molecule that does not contain a polar covalent bond is

Accepted Answer

A)  CO. 
B)  BrF. 
C)  HI. 
D)  Cl2. 
A)  CO. 
B)  BrF. 
C)  HI. 
D)  Cl2.

Question 14

The inert gases

Accepted Answer

A)  have the same atomic number. 
B)  are in the same period of the periodic table. 
C)  are in the same group of the periodic table. 
D)  join in pairs to form diatomic molecules. 
A)  have the same atomic number. 
B)  are in the same period of the periodic table. 
C)  are in the same group of the periodic table. 
D)  join in pairs to form diatomic molecules.

Question 15

The chromate ion has the formula CrO42-. The formula of tinI) chromate is

Accepted Answer

A)  SnCrO4. 
B)  Sn2CrO4. 
C)  SnCrO4)2. 
D)  Sn2CrO4)2. 
A)  SnCrO4. 
B)  Sn2CrO4. 
C)  SnCrO4)2. 
D)  Sn2CrO4)2.

Question 16

A free radical is extremely reactive because it

Accepted Answer

A)  is a negative ion. 
B)  is a positive ion. 
C)  contains an unpaired electron. 
D)  contains only paired electrons. 
A)  is a negative ion. 
B)  is a positive ion. 
C)  contains an unpaired electron. 
D)  contains only paired electrons.

Question 17

A family of elements whose atoms react by picking up electrons is the

Accepted Answer

A)  alkali metals. 
B)  halogens. 
C)  transition metals. 
D)  inert gases. 
A)  alkali metals. 
B)  halogens. 
C)  transition metals. 
D)  inert gases.

Question 18

Ionic compounds in the solid state

Accepted Answer

A)  always consist of molecules. 
B)  sometimes consist of molecules. 
C)  never consist of molecules. 
D)  never occur as crystals. 
A)  always consist of molecules. 
B)  sometimes consist of molecules. 
C)  never consist of molecules. 
D)  never occur as crystals.

Question 19

AgNO3 reacts with CaCl2 to form AgCl and CuNO3)2. The number of units of AgNO3 needed to form one unit of CuNO3)2 in this reaction is

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
A)  1. 
B)  2. 
C)  3. 
D)  4.

Question 20

A vertical column in the periodic table is called a

Accepted Answer

A)  shell. 
B)  subshell. 
C)  group. 
D)  period. 
A)  shell. 
B)  subshell. 
C)  group. 
D)  period.

Potassium forms K⁺ ions and sulfur forms S^2- ions. The formula of potassium sulfide is

Table salt, NaCl, consists of

Which of the following chemical equations is balanced?

The missing number in the equation 6H₃BO₃ → H₄B₆O₁₁ + )H₂O is

The least active of the following metals is

Organic compounds

The number of compounds that carbon and oxygen can form is

The most active of the following nonmetals is

The most abundant element in the universe is

The number of atoms in a molecule of ammonium sulfide, NH₄)₂S, is

Which of the following is a heterogeneous mixture?

Which of the following is a compound?

A molecule that does not contain a polar covalent bond is

The inert gases

The chromate ion has the formula CrO₄^2-. The formula of tinI) chromate is

A free radical is extremely reactive because it

A family of elements whose atoms react by picking up electrons is the

Ionic compounds in the solid state

AgNO₃ reacts with CaCl₂ to form AgCl and CuNO₃)₂. The number of units of AgNO₃ needed to form one unit of CuNO₃)₂ in this reaction is

A vertical column in the periodic table is called a

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Exam 10: The Periodic Law

Potassium forms K+ ions and sulfur forms S2- ions. The formula of potassium sulfide is

Table salt, NaCl, consists of

Which of the following chemical equations is balanced?

The missing number in the equation 6H3BO3 → H4B6O11 + )H2O is

The least active of the following metals is

Organic compounds

The number of compounds that carbon and oxygen can form is

The most active of the following nonmetals is

The most abundant element in the universe is

The number of atoms in a molecule of ammonium sulfide, NH4)2S, is

Which of the following is a heterogeneous mixture?

Which of the following is a compound?

A molecule that does not contain a polar covalent bond is

The inert gases

The chromate ion has the formula CrO42-. The formula of tinI) chromate is

A free radical is extremely reactive because it

A family of elements whose atoms react by picking up electrons is the

Ionic compounds in the solid state

AgNO3 reacts with CaCl2 to form AgCl and CuNO3)2. The number of units of AgNO3 needed to form one unit of CuNO3)2 in this reaction is

A vertical column in the periodic table is called a

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

Filters

Potassium forms K⁺ ions and sulfur forms S^2- ions. The formula of potassium sulfide is

The missing number in the equation 6H₃BO₃ → H₄B₆O₁₁ + )H₂O is

The number of atoms in a molecule of ammonium sulfide, NH₄)₂S, is

The chromate ion has the formula CrO₄^2-. The formula of tinI) chromate is

AgNO₃ reacts with CaCl₂ to form AgCl and CuNO₃)₂. The number of units of AgNO₃ needed to form one unit of CuNO₃)₂ in this reaction is