Question 1

Which one or more of the following statements is/are true?

Accepted Answer

A) Metals are opaque to light. 
B) Metals conduct electric current well. 
C) Nonmetals conduct heat well. 
D) Solid nonmetals are brittle. 
E) Both A, B and D 
A) Metals are opaque to light. 
B) Metals conduct electric current well. 
C) Nonmetals conduct heat well. 
D) Solid nonmetals are brittle. 
E) Both A, B and D

Question 2

The least active of the following nonmetals is

Accepted Answer

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

Question 3

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 isotopes. 
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 isotopes.

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 number of atoms in a molecule of Ca3(PO4)2 is

Accepted Answer

A) 8. 
B) 12. 
C) 13. 
D) 16. 
A) 8. 
B) 12. 
C) 13. 
D) 16.

Question 6

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 7

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.

Question 8

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 9

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.

Question 10

Which one of the following substances is a compound?

Accepted Answer

A) milk 
B) soil 
C) gold 
D) water 
A) milk 
B) soil 
C) gold 
D) water

Question 11

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 12

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 13

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.

Question 14

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 15

Each horizontal row of the periodic table includes elements with chemical characteristics that are, in general,

Accepted Answer

A) identical. 
B) similar. 
C) different. 
D) sometimes similar and sometimes different. 
A) identical. 
B) similar. 
C) different. 
D) sometimes similar and sometimes different.

Question 16

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 17

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 18

The charge on halogen ions is

Accepted Answer

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

Question 19

A compound whose name ends in -ate always contains

Accepted Answer

A) hydrogen. 
B) oxygen. 
C) one or more hydroxide groups. 
D) only two elements. 
A) hydrogen. 
B) oxygen. 
C) one or more hydroxide groups. 
D) only two elements.

Question 20

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.

Which one or more of the following statements is/are true?

The least active of the following nonmetals is

The atomic mass of an element is

A vertical column in the periodic table is called a

The number of atoms in a molecule of Ca₃(PO₄)₂ is

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

The name of the compound Ca₃N₂ is

The inert gases

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

Which one of the following substances is a compound?

The number of compounds that carbon and oxygen can form is

Organic compounds

Atoms of two different elements

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

Each horizontal row of the periodic table includes elements with chemical characteristics that are, in general,

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

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

The charge on halogen ions is

A compound whose name ends in -ate always contains

At room temperature, bromine is a

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Exam 10: The Periodic Law

Which one or more of the following statements is/are true?

The least active of the following nonmetals is

The atomic mass of an element is

A vertical column in the periodic table is called a

The number of atoms in a molecule of Ca3(PO4)2 is

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

The name of the compound Ca3N2 is

The inert gases

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

Which one of the following substances is a compound?

The number of compounds that carbon and oxygen can form is

Organic compounds

Atoms of two different elements

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

Each horizontal row of the periodic table includes elements with chemical characteristics that are, in general,

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

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

The charge on halogen ions is

A compound whose name ends in -ate always contains

At room temperature, bromine is 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

Universe

Filters

The number of atoms in a molecule of Ca₃(PO₄)₂ is

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

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

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