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

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. C

Question 3

The missing number in the equation 2HNO3 + Ca(OH)2 $\rarr$Ca(NO3)2 + ( )H2O is

Accepted Answer

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

Question 4

The most active of the following metals is

Accepted Answer

A) copper. 
B) lead. 
C) potassium. 
D) gold. 
A) copper. 
B) lead. 
C) potassium. 
D) gold.

Question 5

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 6

An element that can form an ionic compound with oxygen is

Accepted Answer

A) carbon. 
B) calcium. 
C) nitrogen. 
D) neon. 
A) carbon. 
B) calcium. 
C) nitrogen. 
D) neon.

Question 7

Which one of the following substances is a heterogeneous mixture?

Accepted Answer

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

Question 8

An atom whose outer electron shell lacks one electron from being filled is

Accepted Answer

A) a halogen. 
B) an active metal. 
C) an inactive metal. 
D) an inert gas. 
A) a halogen. 
B) an active metal. 
C) an inactive metal. 
D) an inert gas.

Question 9

The ion of the hydroxide group has the symbol

Accepted Answer

A) OH. 
B) OH+. 
C) OH-. 
D) H2O-. 
A) OH. 
B) OH+. 
C) OH-. 
D) H2O-.

Question 10

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 11

The missing number in the equation ( )C4H10 + 13O2 $\rarr$8CO2 + 10H2O is

Accepted Answer

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

Question 12

Elements with similar properties (other than atomic mass)

Accepted Answer

A) occupy the same period of the periodic table. 
B) have similar electron configurations. 
C) have the same number of neutrons in their nuclei. 
D) exist in the same physical state (solid, liquid, or gas). 
A) occupy the same period of the periodic table. 
B) have similar electron configurations. 
C) have the same number of neutrons in their nuclei. 
D) exist in the same physical state (solid, liquid, or gas).

Question 13

The charge on alkali metal ions is

Accepted Answer

A) +1. 
B) +2. 
C) -1. 
D) -2. 
A) +1. 
B) +2. 
C) -1. 
D) -2.

Question 14

The metals most difficult to extract from their ores in general

Accepted Answer

A) are the least active chemically. 
B) are the most active chemically. 
C) have the lowest atomic numbers. 
D) have the highest atomic numbers. 
A) are the least active chemically. 
B) are the most active chemically. 
C) have the lowest atomic numbers. 
D) have the highest atomic numbers.

Question 15

Which one or more of the following equations is (are) balanced?

Accepted Answer

A) PCl2 + 4H2O $\rarr$H3PO4 + 5HCl 
B) 6H2O + 6CO2 $\rarr$C6H12O6 + 6O2 
C) C7H16 + 11O2 $\rarr$7CO2 + 8H2O 
D) Fe3O4 + 4H2 $\rarr$  3Fe + 4H2O 
E) Both B, C and D 
A) PCl2 + 4H2O $\rarr$H3PO4 + 5HCl 
B) 6H2O + 6CO2 $\rarr$C6H12O6 + 6O2 
C) C7H16 + 11O2 $\rarr$7CO2 + 8H2O 
D) Fe3O4 + 4H2 $\rarr$  3Fe + 4H2O 
E) Both B, C and D

Question 16

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

Accepted Answer

A) 2. 
B) 4. 
C) 6. 
D) 8. 
A) 2. 
B) 4. 
C) 6. 
D) 8.

Question 17

The least active of the following metals is

Accepted Answer

A) copper. 
B) lead. 
C) potassium. 
D) gold 
A) copper. 
B) lead. 
C) potassium. 
D) gold

Question 18

The number of hydrogen atoms in a molecule of C3H5(OH)3 is

Accepted Answer

A) 2. 
B) 6. 
C) 8. 
D) 18. 
A) 2. 
B) 6. 
C) 8. 
D) 18.

Question 19

In a covalent compound

Accepted Answer

A) electrons are shifted from one atom to another. 
B) only atoms of the same element are present. 
C) there must be at least one carbon atom. 
D) adjacent atoms share electron pairs. 
A) electrons are shifted from one atom to another. 
B) only atoms of the same element are present. 
C) there must be at least one carbon atom. 
D) adjacent atoms share electron pairs.

Question 20

According to the periodic table, the chemical properties of the elements are periodic functions of their

Accepted Answer

A) density. 
B) atomic number. 
C) atomic mass. 
D) mass number. 
A) density. 
B) atomic number. 
C) atomic mass. 
D) mass number.

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

Carbon

The missing number in the equation 2HNO₃ + Ca(OH)₂ $\rarr$ Ca(NO₃)₂ + ( )H₂O is

The most active of the following metals is

Each electron shell in an atom contains

An element that can form an ionic compound with oxygen is

Which one of the following substances is a heterogeneous mixture?

An atom whose outer electron shell lacks one electron from being filled is

The ion of the hydroxide group has the symbol

Ionic compounds in the solid state

The missing number in the equation ( )C₄H₁₀ + 13O₂ $\rarr$ 8CO₂ + 10H₂O is

Elements with similar properties (other than atomic mass)

The charge on alkali metal ions is

The metals most difficult to extract from their ores in general

Which one or more of the following equations is (are) balanced?

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

The least active of the following metals is

The number of hydrogen atoms in a molecule of C₃H₅(OH)₃ is

In a covalent compound

According to the periodic table, the chemical properties of the elements are periodic functions of their

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Exam 10: The Periodic Law

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

Carbon

The missing number in the equation 2HNO3 + Ca(OH)2 →\rarr→ Ca(NO3)2 + ( )H2O is

The most active of the following metals is

Each electron shell in an atom contains

An element that can form an ionic compound with oxygen is

Which one of the following substances is a heterogeneous mixture?

An atom whose outer electron shell lacks one electron from being filled is

The ion of the hydroxide group has the symbol

Ionic compounds in the solid state

The missing number in the equation ( )C4H10 + 13O2 →\rarr→ 8CO2 + 10H2O is

Elements with similar properties (other than atomic mass)

The charge on alkali metal ions is

The metals most difficult to extract from their ores in general

Which one or more of the following equations is (are) balanced?

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

The least active of the following metals is

The number of hydrogen atoms in a molecule of C3H5(OH)3 is

In a covalent compound

According to the periodic table, the chemical properties of the elements are periodic functions of their

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

Universe

Filters

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

The missing number in the equation 2HNO₃ + Ca(OH)₂ $\rarr$ Ca(NO₃)₂ + ( )H₂O is

The missing number in the equation ( )C₄H₁₀ + 13O₂ $\rarr$ 8CO₂ + 10H₂O is

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

The number of hydrogen atoms in a molecule of C₃H₅(OH)₃ is