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.

Question 2

When atoms join to form a molecule,

Accepted Answer

A) energy is absorbed. 
B) energy is given off. 
C) energy is neither absorbed nor given off. 
D) Any of these choices, depending on the circumstances. 
A) energy is absorbed. 
B) energy is given off. 
C) energy is neither absorbed nor given off. 
D) Any of these choices, depending on the circumstances.

Question 3

Which of the following statements is not true of all metals?

Accepted Answer

A) They conduct heat well. 
B) They conduct electric current well. 
C) They are solids at room temperature. 
D) They are opaque to light. 
A) They conduct heat well. 
B) They conduct electric current well. 
C) They are solids at room temperature. 
D) They are opaque to light.

Question 4

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.

Question 5

The missing number in the equation 6H3BO3 $\rarr$H4B6O11 + ( )H2O is

Accepted Answer

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

Question 6

The largest number of elements are classed as

Accepted Answer

A) metals. 
B) inert gases. 
C) nonmetals. 
D) liquids. 
A) metals. 
B) inert gases. 
C) nonmetals. 
D) liquids.

Question 7

A bonding molecular orbital

Accepted Answer

A) always consists of s atomic orbitals that overlap. 
B) always consists of p atomic orbitals that overlap. 
C) always consists of one s and one p atomic orbital that overlap. 
D) may consist of any of the above overlaps. 
A) always consists of s atomic orbitals that overlap. 
B) always consists of p atomic orbitals that overlap. 
C) always consists of one s and one p atomic orbital that overlap. 
D) may consist of any of the above overlaps.

Question 8

AgNO3 reacts with CaCl2 to form AgCl and Cu(NO3)2.The number of units of AgNO3 needed to form one unit of Cu(NO3)2 in this reaction is

Accepted Answer

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

Question 9

The number of units of NaOH needed to react with 1 unit of H3PO4 to form Na3PO4 and H2O is

Accepted Answer

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

Question 10

Which of the following is a homogeneous mixture?

Accepted Answer

A) blood 
B) air 
C) water 
D) sugar 
A) blood 
B) air 
C) water 
D) sugar

Question 11

At room temperature, bromine is a

Accepted Answer

A) colorless gas. 
B) greenish-yellow gas. 
C) reddish-brown liquid. 
D) steel-gray solid. 
A) colorless gas. 
B) greenish-yellow gas. 
C) reddish-brown liquid. 
D) steel-gray solid.

Question 12

Carbon

Accepted Answer

A) is a typical metal. 
B) is a typical nonmetal. 
C) has properties intermediate between those of metals and nonmetals. 
D) has properties no other element has. 
A) is a typical metal. 
B) is a typical nonmetal. 
C) has properties intermediate between those of metals and nonmetals. 
D) has properties no other element has.

Question 13

The nitrate ion has the formula NO3-.The formula of mercury(II) nitrate is

Accepted Answer

A) HgNO3. 
B) Hg2NO3. 
C) Hg(NO3)2. 
D) Hg2(NO3)2. 
A) HgNO3. 
B) Hg2NO3. 
C) Hg(NO3)2. 
D) Hg2(NO3)2.

Question 14

The least 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 15

A horizontal row 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.

Question 16

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 17

Each electron shell in an atom contains

Accepted Answer

A) the same number of electrons as all its other shells. 
B) electrons whose energies are exactly the same. 
C) electrons with the same principal quantum number n. 
D) electrons with the same probability clouds. 
A) the same number of electrons as all its other shells. 
B) electrons whose energies are exactly the same. 
C) electrons with the same principal quantum number n. 
D) electrons with the same probability clouds.

Question 18

The scientist who first established the relative masses of different elements was

Accepted Answer

A) Mendeleev. 
B) Maxwell. 
C) Priestley. 
D) Dalton. 
A) Mendeleev. 
B) Maxwell. 
C) Priestley. 
D) Dalton.

Question 19

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 20

Atoms of two different elements

Accepted Answer

A) may form no compounds together. 
B) can form only one compound together. 
C) can always form more than one compound together. 
D) must form ions of the same charge if they are to form a compound together. 
A) may form no compounds together. 
B) can form only one compound together. 
C) can always form more than one compound together. 
D) must form ions of the same charge if they are to form a compound together.

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

When atoms join to form a molecule,

Which of the following statements is not true of all metals?

A vertical column in the periodic table is called a

The missing number in the equation 6H₃BO₃ $\rarr$ H₄B₆O₁₁ + ( )H₂O is

The largest number of elements are classed as

A bonding molecular orbital

AgNO₃ reacts with CaCl₂ to form AgCl and Cu(NO₃)₂.The number of units of AgNO₃ needed to form one unit of Cu(NO₃)₂ in this reaction is

The number of units of NaOH needed to react with 1 unit of H₃PO₄ to form Na₃PO₄ and H₂O is

Which of the following is a homogeneous mixture?

At room temperature, bromine is a

Carbon

The nitrate ion has the formula NO₃^-.The formula of mercury(II) nitrate is

The least active of the following nonmetals is

A horizontal row in the periodic table is called a

Organic compounds

Each electron shell in an atom contains

The scientist who first established the relative masses of different elements was

A free radical is extremely reactive because it

Atoms of two different elements

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

Filters

Exam 10: The Periodic Law

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

When atoms join to form a molecule,

Which of the following statements is not true of all metals?

A vertical column in the periodic table is called a

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

The largest number of elements are classed as

A bonding molecular orbital

AgNO3 reacts with CaCl2 to form AgCl and Cu(NO3)2.The number of units of AgNO3 needed to form one unit of Cu(NO3)2 in this reaction is

The number of units of NaOH needed to react with 1 unit of H3PO4 to form Na3PO4 and H2O is

Which of the following is a homogeneous mixture?

At room temperature, bromine is a

Carbon

The nitrate ion has the formula NO3-.The formula of mercury(II) nitrate is

The least active of the following nonmetals is

A horizontal row in the periodic table is called a

Organic compounds

Each electron shell in an atom contains

The scientist who first established the relative masses of different elements was

A free radical is extremely reactive because it

Atoms of two different elements

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

Filters

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

The missing number in the equation 6H₃BO₃ $\rarr$ H₄B₆O₁₁ + ( )H₂O is

AgNO₃ reacts with CaCl₂ to form AgCl and Cu(NO₃)₂.The number of units of AgNO₃ needed to form one unit of Cu(NO₃)₂ in this reaction is

The number of units of NaOH needed to react with 1 unit of H₃PO₄ to form Na₃PO₄ and H₂O is

The nitrate ion has the formula NO₃^-.The formula of mercury(II) nitrate is