Question 1

The name of the compound Ca3N2 is

Accepted Answer

A) calcium nitride. 
B) calcium nitrate. 
C) calcium nitrite. 
D) calcium trinitride. 
A) calcium nitride. 
B) calcium nitrate. 
C) calcium nitrite. 
D) calcium trinitride. A

Question 2

The number of H2O molecules needed to react with 1 atom of Be to form H2 and Ba(OH)2 is

Accepted Answer

A) 1. 
B) 2. 
C) 4. 
D) 8. 
A) 1. 
B) 2. 
C) 4. 
D) 8. B

Question 3

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-. C

Question 4

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 5

Of the halogens, at room temperature and atmospheric pressure

Accepted Answer

A) all are gases. 
B) one is a gas and the others are liquids. 
C) one is a gas and the others are solids. 
D) one is a liquid and the others are gases or solids. 
A) all are gases. 
B) one is a gas and the others are liquids. 
C) one is a gas and the others are solids. 
D) one is a liquid and the others are gases or solids.

Question 6

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 7

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 8

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 9

The atomic mass of an element is

Accepted Answer

A) the average atomic mass of its isotopes according to their proportions in nature. 
B) the average mass number of its isotopes according to their proportions in nature. 
C) the average atomic number of its isotopes according to their proportions in nature. 
D) the atomic mass of its most abundant isotope. 
A) the average atomic mass of its isotopes according to their proportions in nature. 
B) the average mass number of its isotopes according to their proportions in nature. 
C) the average atomic number of its isotopes according to their proportions in nature. 
D) the atomic mass of its most abundant isotope.

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

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 12

An atom whose outer electron shell is 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 13

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 14

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.

Question 15

Which of the following chemical equations is balanced?

Accepted Answer

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

Question 16

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 17

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 18

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 19

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.

Question 20

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.

The name of the compound Ca₃N₂ is

The number of H₂O molecules needed to react with 1 atom of Be to form H₂ and Ba(OH)₂ is

The ion of the hydroxide group has the symbol

The most abundant element in the universe is

Of the halogens, at room temperature and atmospheric pressure

The number of compounds that carbon and oxygen can form is

In a covalent compound

An element that can form an ionic compound with oxygen is

The atomic mass of an element is

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

Elements with similar properties (other than atomic mass)

An atom whose outer electron shell is filled is

Which of the following is a compound?

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

Which of the following chemical equations is balanced?

The metals most difficult to extract from their ores in general

A molecule that does not contain a polar covalent bond is

The most active of the following nonmetals is

Table salt, NaCl, consists of

The inert gases

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

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The Nucleus

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Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

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The Solar System

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Exam 10: The Periodic Law

The name of the compound Ca3N2 is

The number of H2O molecules needed to react with 1 atom of Be to form H2 and Ba(OH)2 is

The ion of the hydroxide group has the symbol

The most abundant element in the universe is

Of the halogens, at room temperature and atmospheric pressure

The number of compounds that carbon and oxygen can form is

In a covalent compound

An element that can form an ionic compound with oxygen is

The atomic mass of an element is

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

Elements with similar properties (other than atomic mass)

An atom whose outer electron shell is filled is

Which of the following is a compound?

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

Which of the following chemical equations is balanced?

The metals most difficult to extract from their ores in general

A molecule that does not contain a polar covalent bond is

The most active of the following nonmetals is

Table salt, NaCl, consists of

The inert gases

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

The name of the compound Ca₃N₂ is

The number of H₂O molecules needed to react with 1 atom of Be to form H₂ and Ba(OH)₂ is

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