Question 1

The gas Freon-11,CCl3F,contains

Accepted Answer

A) C4+,Cl-,and F- ions. 
B) C4+,Cl3-,and F- ions. 
C) C4+ and Cl3F4- ions. 
D) CCl3F molecules. 
A) C4+,Cl-,and F- ions. 
B) C4+,Cl3-,and F- ions. 
C) C4+ and Cl3F4- ions. 
D) CCl3F molecules.

Question 2

Which of the following statements about electron capture is false?

Accepted Answer

A) The electron is used to convert a proton to a neutron. 
B) The electron involved is most likely an outer shell valence electron. 
C) In electron capture decay,the atomic number decreases by one. 
D) In electron capture decay,the mass number remains unchanged. 
A) The electron is used to convert a proton to a neutron. 
B) The electron involved is most likely an outer shell valence electron. 
C) In electron capture decay,the atomic number decreases by one. 
D) In electron capture decay,the mass number remains unchanged.

Question 3

Which are isotopes? An atom that has an atomic number of 34 and a mass number of 76 is an isotope of an atom that has

Accepted Answer

A) an atomic number of 32 and a mass number of 76. 
B) an atomic number of 34 and a mass number of 80. 
C) 42 neutrons and 34 protons. 
D) 42 protons and 34 neutrons. 
A) an atomic number of 32 and a mass number of 76. 
B) an atomic number of 34 and a mass number of 80. 
C) 42 neutrons and 34 protons. 
D) 42 protons and 34 neutrons.

Question 4

How many moles and how many atoms of zinc are in a sample weighing 34.9 g?

Accepted Answer

A) 0)533 mol,8.85 ×10-25 atoms 
B) 0)533 mol,3.21 ×1023 atoms 
C) 1)87 mol,3.10 × 10-24 atoms 
D) 1)87 mol,1.13 × 1024 atoms 
A) 0)533 mol,8.85 ×10-25 atoms 
B) 0)533 mol,3.21 ×1023 atoms 
C) 1)87 mol,3.10 × 10-24 atoms 
D) 1)87 mol,1.13 × 1024 atoms

Question 5

The number of nucleons in an atom or ion is the same as the

Accepted Answer

A) atomic number. 
B) charge on the atom or ion. 
C) mass number. 
D) none of these 
A) atomic number. 
B) charge on the atom or ion. 
C) mass number. 
D) none of these

Question 6

What is the chemical formula for calcium hydroxide?

Accepted Answer

A) CaH2 
B) CaOH 
C) CaOH2 
D) Ca(OH)2 
A) CaH2 
B) CaOH 
C) CaOH2 
D) Ca(OH)2

Question 7

Which of the following decay processes give a product nuclide whose atomic number is one less than the starting nuclide?

Accepted Answer

A) alpha decay 
B) beta decay and positron decay 
C) gamma decay and beta decay 
D) positron decay and electron capture 
A) alpha decay 
B) beta decay and positron decay 
C) gamma decay and beta decay 
D) positron decay and electron capture

Question 8

Which of the following two atoms are isotopes?

Accepted Answer

A)     and      
B)     and      
C)     and      
D)     and      
A)     and      
B)     and      
C)     and      
D)     and

Question 9

A proton is approximately

Accepted Answer

A) 200 times larger than an electron. 
B) 2000 times larger than an electron. 
C) 200 times smaller than an electron. 
D) 2000 times smaller than an electron. 
A) 200 times larger than an electron. 
B) 2000 times larger than an electron. 
C) 200 times smaller than an electron. 
D) 2000 times smaller than an electron.

Question 10

Gasoline is an example of

Accepted Answer

A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture. 
A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture.

Question 11

Which one of the following processes does not result in transmutation to another element?

Accepted Answer

A) alpha emission 
B) beta emission 
C) electron capture 
D) gamma emission 
A) alpha emission 
B) beta emission 
C) electron capture 
D) gamma emission

Question 12

What is the identity of element Q if the ion Q2+ contains 10 electrons?

Accepted Answer

A) C 
B) O 
C) Ne 
D) Mg 
A) C 
B) O 
C) Ne 
D) Mg

Question 13

How many electrons are in the ion,P3-?

Accepted Answer

A) 12 
B) 18 
C) 28 
D) 34 
A) 12 
B) 18 
C) 28 
D) 34

Question 14

Identify the chemical symbol of element Q in

Accepted Answer

A) Br 
B) Hg 
C) Pd 
D) Se 
A) Br 
B) Hg 
C) Pd 
D) Se

Question 15

Which one of the following statements about isotopes is false?

Accepted Answer

A) The ratio of neutrons to protons is about 1:1 for elements lighter than Ca. 
B) The ratio of neutrons to protons is > 1:1 for elements heavier than Ca. 
C) Nonradioactive isotopes generally have an odd number of neutrons. 
D) All isotopes beyond 209Bi are radioactive. 
A) The ratio of neutrons to protons is about 1:1 for elements lighter than Ca. 
B) The ratio of neutrons to protons is > 1:1 for elements heavier than Ca. 
C) Nonradioactive isotopes generally have an odd number of neutrons. 
D) All isotopes beyond 209Bi are radioactive.

Question 16

The existence of electrons in atoms of all elements was demonstrated by

Accepted Answer

A) Millikan's oil drop experiment. 
B) Rutherford's gold foil experiment. 
C) Thomson's cathode ray tube experiment. 
D) None of these 
A) Millikan's oil drop experiment. 
B) Rutherford's gold foil experiment. 
C) Thomson's cathode ray tube experiment. 
D) None of these

Question 17

How many electrons are in the ion,Zn2+?

Accepted Answer

A) 28 
B) 30 
C) 32 
D) 65 
A) 28 
B) 30 
C) 32 
D) 65

Question 18

Use the periodic table below to answer the following questions.  
-In which pair are both formulas of binary fluorides of element D correct?

Accepted Answer

A) DF2 and DF3 
B) DF2 and DF6 
C) DF3 and DF5 
D) DF5 and DF6 
A) DF2 and DF3 
B) DF2 and DF6 
C) DF3 and DF5 
D) DF5 and DF6

Question 19

Which of the compounds,Li3N,NH3,C3H8,IF3 are ionic compounds?

Accepted Answer

A) only C3H8 
B) only Li3N  
C) Li3N  and N H3 
D) N H3,C3H8,and I F3 
A) only C3H8 
B) only Li3N  
C) Li3N  and N H3 
D) N H3,C3H8,and I F3

Question 20

In which set do all elements tend to form anions in binary ionic compounds?

Accepted Answer

A) C,S,Pb 
B) K,Fe,Br 
C) Li,Na,K 
D) N,O,I 
A) C,S,Pb 
B) K,Fe,Br 
C) Li,Na,K 
D) N,O,I

Exam 2: Atoms, molecules, and Ions

The gas Freon-11,CCl3F,contains

Which of the following statements about electron capture is false?

Which are isotopes? An atom that has an atomic number of 34 and a mass number of 76 is an isotope of an atom that has

How many moles and how many atoms of zinc are in a sample weighing 34.9 g?

The number of nucleons in an atom or ion is the same as the

What is the chemical formula for calcium hydroxide?

Which of the following decay processes give a product nuclide whose atomic number is one less than the starting nuclide?

Which of the following two atoms are isotopes?

A proton is approximately

Gasoline is an example of

Which one of the following processes does not result in transmutation to another element?

What is the identity of element Q if the ion Q2+ contains 10 electrons?

How many electrons are in the ion,P3-?

Identify the chemical symbol of element Q in

Which one of the following statements about isotopes is false?

The existence of electrons in atoms of all elements was demonstrated by

How many electrons are in the ion,Zn2+?

Use the periodic table below to answer the following questions. -In which pair are both formulas of binary fluorides of element D correct?

Which of the compounds,Li3N,NH3,C3H8,IF3 are ionic compounds?

In which set do all elements tend to form anions in binary ionic compounds?

Chemistry: Matter and Measurement

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

The gas Freon-11,CCl₃F,contains

What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

How many electrons are in the ion,P^3-?

How many electrons are in the ion,Zn²⁺?

Which of the compounds,Li₃N,NH₃,C₃H₈,IF₃ are ionic compounds?