Question 1

State the two important experimental results (and the names of the responsible scientists)which enabled the mass of the electron to be determined.

Accepted Answer

Thomson measured m/e,the mass-...

Question 2

Which of these compounds is most likely to be ionic?

Accepted Answer

A)  GaAs
B)  SrBr2
C)  NO2
D)  CBr4
E)  H2O

Question 3

The fact that when 48.6 g of magnesium completely reacts with 32.0 g of oxygen,exactly 80.6 g of magnesium oxide is formed illustrates

Accepted Answer

A)  the law of definite proportions.
B)  the law of conservation of mass.
C)  the law of multiple proportions.
D)  Dalton's description of the atom.

Question 4

Which of these pairs of elements would be most likely to form an ionic compound?

Accepted Answer

A)  P and Br
B)  Cu and K
C)  C and O
D)  O and Zn
E)  Al and Rb

Question 5

Rutherford's experiment with alpha particle scattering by gold foil established that

Accepted Answer

A)  protons are not evenly distributed throughout an atom.
B)  electrons have a negative charge.
C)  electrons have a positive charge.
D)  atoms are made of protons,neutrons,and electrons.
E)  protons are 1840 times heavier than electrons.

Question 6

Which of the following contains ionic bonding?

Accepted Answer

A)  CO
B)  SrF2
C)  Al
D)  OCl2
E)  HCl

Question 7

Which of these pairs of elements would be most likely to form an ionic compound?

Accepted Answer

A)  Cl and I
B)  Al and K
C)  Cl and Mg
D)  C and S
E)  Al and Mg

Question 8

Which of the following substances is a molecule,but not a compound?

Accepted Answer

A)  SO2
B)  O2
C)  CS2
D)  Ar
E)  CO32-

Question 9

Ionic compounds may carry a net positive or net negative charge.

Accepted Answer

A) True 
 B)False

Question 10

Who discovered the neutron,the subatomic particle having a neutral charge?

Accepted Answer

A)  Millikan
B)  Dalton
C)  Chadwick
D)  Rutherford
E)  Thomson

Question 11

All neutral atoms of tin have 50 protons and 50 electrons.

Accepted Answer

A) True 
 B)False

Question 12

Many compounds can be represented with the same empirical formula.

Accepted Answer

A) True 
 B)False

Question 13

What is the term for the total number of neutrons and protons in the nucleus of each atom of an element?

Accepted Answer

A)  Isotope number
B)  Mass number
C)  Mass-to-charge ratio
D)  Atomic number
E)  Atomic mass units

Question 14

Lead (Pb)is a main group element.

Accepted Answer

A) True 
 B)False

Question 15

What is the formula of hydrobromic acid?

Accepted Answer

A)  H2OBr
B)  HBrO3
C)  HBrO
D)  HBr
E)  HBr·2H2O

Question 16

Who is credited with discovering the atomic nucleus?

Accepted Answer

A)  Dalton
B)  Gay-Lussac
C)  Thomson
D)  Chadwick
E)  Rutherford

Question 17

The elements in Group 2A are called the ________.

Accepted Answer

alkaline e...

Question 18

Which of the following is a molecular formula for a compound with an empirical formula of CH?

Accepted Answer

A)  C2H6
B)  C3H9
C)  C4H10
D)  C6H6
E)  None of the answers is correct.

Question 19

Which of these compounds is most likely to be ionic?

Accepted Answer

A)  NCl3
B)  BaCl2
C)  CO
D)  SO2
E)  SF4

Question 20

Silicon,which makes up about 25% of Earth's crust by mass,is used widely in the modern electronics industry.It has three naturally occurring isotopes,28Si,29Si,and 30Si.Calculate the atomic mass of silicon. Isotope
Isotopic Mass (amu) 
Abudance %
28Si
27) 976927
92) 22
29Si
28) 976495
4) 69
30Si
29) 973770
3) 09

Accepted Answer

A)  29.2252 amu
B)  28.9757 amu
C)  28.7260 amu
D)  28.0855 amu
E)  27.9801 amu

Exam 2: Atoms Molecules and Ions

What is the term for the total number of neutrons and protons in the nucleus of each atom of an element?

Correct Answer
verified

Ionic compounds may carry a net positive or net negative charge.

Correct Answer
verified

Which of the following contains ionic bonding?

Correct Answer
verified

Who discovered the neutron,the subatomic particle having a neutral charge?

Correct Answer
verified

Rutherford's experiment with alpha particle scattering by gold foil established that

Correct Answer
verified

What is the formula of hydrobromic acid?

Correct Answer
verified

All neutral atoms of tin have 50 protons and 50 electrons.

Correct Answer
verified

Which of these pairs of elements would be most likely to form an ionic compound?

Correct Answer
verified

Many compounds can be represented with the same empirical formula.

Correct Answer
verified

Lead (Pb)is a main group element.

Correct Answer
verified

Correct Answer
verified

Which of the following substances is a molecule,but not a compound?

Correct Answer
verified

Which of these pairs of elements would be most likely to form an ionic compound?

Correct Answer
verified

State the two important experimental results (and the names of the responsible scientists)which enabled the mass of the electron to be determined.

Correct Answer
verified
Thomson measured m/e,the mass-...
View Answer

The elements in Group 2A are called the ________.

Correct Answer
verified
alkaline e...
View Answer

Which of these compounds is most likely to be ionic?

Correct Answer
verified

Which of the following is a molecular formula for a compound with an empirical formula of CH?

Correct Answer
verified

Which of these compounds is most likely to be ionic?

Correct Answer
verified

Who is credited with discovering the atomic nucleus?

Correct Answer
verified

The fact that when 48.6 g of magnesium completely reacts with 32.0 g of oxygen,exactly 80.6 g of magnesium oxide is formed illustrates

Correct Answer
verified

Exam 2: Atoms Molecules and Ions

What is the term for the total number of neutrons and protons in the nucleus of each atom of an element?

Correct AnswerverifiedShow Answer

Ionic compounds may carry a net positive or net negative charge.

Correct AnswerverifiedShow Answer

Which of the following contains ionic bonding?

Correct AnswerverifiedShow Answer

Who discovered the neutron,the subatomic particle having a neutral charge?

Correct AnswerverifiedShow Answer

Rutherford's experiment with alpha particle scattering by gold foil established that

Correct AnswerverifiedShow Answer

What is the formula of hydrobromic acid?

Correct AnswerverifiedShow Answer

All neutral atoms of tin have 50 protons and 50 electrons.

Correct AnswerverifiedShow Answer

Which of these pairs of elements would be most likely to form an ionic compound?

Correct AnswerverifiedShow Answer

Many compounds can be represented with the same empirical formula.

Correct AnswerverifiedShow Answer

Lead (Pb)is a main group element.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following substances is a molecule,but not a compound?

Correct AnswerverifiedShow Answer

Which of these pairs of elements would be most likely to form an ionic compound?

Correct AnswerverifiedShow Answer

State the two important experimental results (and the names of the responsible scientists)which enabled the mass of the electron to be determined.

Correct AnswerverifiedThomson measured m/e,the mass-...View AnswerShow Answer

The elements in Group 2A are called the ________.

Correct Answerverifiedalkaline e...View AnswerShow Answer

Which of these compounds is most likely to be ionic?

Correct AnswerverifiedShow Answer

Which of the following is a molecular formula for a compound with an empirical formula of CH?

Correct AnswerverifiedShow Answer

Which of these compounds is most likely to be ionic?

Correct AnswerverifiedShow Answer

Who is credited with discovering the atomic nucleus?

Correct AnswerverifiedShow Answer

The fact that when 48.6 g of magnesium completely reacts with 32.0 g of oxygen,exactly 80.6 g of magnesium oxide is formed illustrates

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Thomson measured m/e,the mass-...
View Answer

Correct Answer
verified
alkaline e...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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