Question 1

Determine the relative mass for the hypothetical elements Zp and Wq given the following information:
The element Xu has an atomic mass of 24.00 jigs.
The element Wq is three times lighter than Xu.
The element Zp is two and a half times heavier than a Xu.

Accepted Answer

Wq atomic mass is 8.000 jigs
Zp atomic mass is 60.00 jigs

Question 2

Which of the following statements is not a part of atomic theory?

Accepted Answer

A)   Chemical change involves a union, separation, or rearrangement of atoms.
B)   A pure substance will have a varying relative number of atom types.
C)   All matter is made up of atoms.
D)   Atoms are considered indestructible during chemical change. B

Question 3

What is the atomic number of an isobar of
 In which there is an equal number of all three types of subatomic particles present?

Accepted Answer

A)   8
B)   9
C)   10
D)   11 B

Question 4

Place in the blank the letter of the correct response in each horizontal row of choices.
-________ Mass number of an isotope containing 45 protons and 58 neutrons

Accepted Answer

A)   13
B)   45
C)   58
D)   103

Question 5

In which of the following pairs of formulas do the two members of the pair contain the same number of elements as well as the same number of atoms?

Accepted Answer

A)   Co and CO
B)   NaHCO3 and NaHSO4
C)   SO3 and SO2
D)   Cl2CO and C2HCl

Question 6

Which one of the following statements about molecules is correct?

Accepted Answer

A)   Some compounds have molecules as their basic structural unit.
B)   For a molecular compound, the atom is the limit of chemical subdivision.
C)   For a molecular compound, the atom is the limit of physical subdivision.
D)   Molecules of compounds may be either heteroatomic or homoatomic.

Question 7

Place in the blank the letter of the correct response in each horizontal row of choices.
-________ Number of elements in the compound Al2SO4

Accepted Answer

A)   3
B)   4
C)   5
D)   7

Question 8

In which of the following compounds does one molecule of the compound contain 3 elements and 8 atoms?

Accepted Answer

A)   NaHCO3
B)   C2H7N
C)   H3AsO4
D)   POCl3

Question 9

Which statement about an atom is false?

Accepted Answer

A)   The nucleus is the center region of an atom.
B)   The space occupied by the electrons is primarily empty.
C)   The nucleus accounts for a small portion of the mass of an atom.
D)   The volume occupied by electrons is referred to as an electron cloud.

Question 10

Which statement concerning the molecules depicted is incorrect?

Accepted Answer

A)   The molecules in box I represent a pure substance.
B)   The molecules in box III represent a mixture of elements.
C)   The molecules in box II represent a compound composed of two different elements.
D)   The molecules in box IV represents two different compounds and an element.

Question 11

How many atoms of each element are present in 3 formula units of (NH4)2HAsO4?

Accepted Answer

A)   10 N atoms, 18 H atoms, 5 As atoms, 18 O atoms
B)   6 N atoms, 9 H atoms, 3 As atoms, 12 O atoms
C)   5 N atoms, 45 H atoms, 4 As atoms, 18 O atoms
D)   6 N atoms, 27 H atoms, 3 As atoms, 12 O atoms

Question 12

An isotope of which element is used as the standard for the relative mass scale for atoms?

Accepted Answer

A)   carbon
B)   oxygen
C)   hydrogen
D)   helium

Question 13

Chlorine, which exists in nature in two isotopic forms, has an atomic mass of 35.5 amu. This means that ________.

Accepted Answer

A)   all chlorine atoms have masses of 35.5 amu
B)   35.5 amu is the upper limit for the mass of a chlorine atom
C)   35Cl and 37Cl each constitute approximately 50% of all chlorine atoms
D)   35Cl constitutes 75% of full chlorine atoms, 37Cl represents 25%

Question 14

Fill in the blanks in the following sentences using words from the following response list:
  
Items in the response list may be used more than once or need not be used at all.
-The mass number for an atom equals the sum of the __________ and __________ in the atom's nucleus.

Accepted Answer

The answer of Fill in the blanks in the following...

Question 15

What is the total number of hydrogen atoms present in 6 formula units of Mg(C2H3O2)2?

Accepted Answer

A)   12
B)   6
C)   36
D)   24

Question 16

Which of the following properties for the most abundant isotope of an element would not be possessed by the second most abundant isotope of the same element?

Accepted Answer

A)   boiling point is 2403 °C
B)   atomic number is 31
C)   isotopic mass is 69.92 amu
D)   reacts with chlorine to give the compound XCl3

Question 17

Which formula is correct for a molecule with 4 P atoms, and 10 O atoms?

Accepted Answer

A)   3 P4O10
B)   2(P2O3) 2
C)   P4O10
D)   3 P3O6

Question 18

For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all.
-________ Has more neutrons than electrons

Accepted Answer

A)   
B)   
C)   
D)

Question 19

The diameters and masses of atoms are, respectively, on the order of ________.

Accepted Answer

A)   10-11 m and 10-11 g
B)   10-23 m and 10-10 g
C)   10-24 m and 10-10 g
D)   10-10 m and 10-23 g

Question 20

Fill in the blanks in the following sentences using words from the following response list:
  
Items in the response list may be used more than once or need not be used at all.
-The mass of a __________ (a neutral species) is many times greater than the mass of an electron and is approximately the same as the mass of a __________.

Accepted Answer

The answer of Fill in the blanks in the following...

Exam 5: Atoms, Molecules, Formulas, and Subatomic Particles

Determine the relative mass for the hypothetical elements Zp and Wq given the following information: The element Xu has an atomic mass of 24.00 jigs. The element Wq is three times lighter than Xu. The element Zp is two and a half times heavier than a Xu.

Which of the following statements is not a part of atomic theory?

What is the atomic number of an isobar of In which there is an equal number of all three types of subatomic particles present?

Place in the blank the letter of the correct response in each horizontal row of choices. -________ Mass number of an isotope containing 45 protons and 58 neutrons

In which of the following pairs of formulas do the two members of the pair contain the same number of elements as well as the same number of atoms?

Which one of the following statements about molecules is correct?

Place in the blank the letter of the correct response in each horizontal row of choices. -________ Number of elements in the compound Al₂SO₄

In which of the following compounds does one molecule of the compound contain 3 elements and 8 atoms?

Which statement about an atom is false?

Which statement concerning the molecules depicted is incorrect?

How many atoms of each element are present in 3 formula units of (NH₄) ₂HAsO₄?

An isotope of which element is used as the standard for the relative mass scale for atoms?

Chlorine, which exists in nature in two isotopic forms, has an atomic mass of 35.5 amu. This means that ________.

Fill in the blanks in the following sentences using words from the following response list: Items in the response list may be used more than once or need not be used at all. -The mass number for an atom equals the sum of the and in the atom's nucleus.

What is the total number of hydrogen atoms present in 6 formula units of Mg(C₂H₃O₂) ₂?

Which of the following properties for the most abundant isotope of an element would not be possessed by the second most abundant isotope of the same element?

Which formula is correct for a molecule with 4 P atoms, and 10 O atoms?

For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons

The diameters and masses of atoms are, respectively, on the order of ________.

Exam 5: Atoms, Molecules, Formulas, and Subatomic Particles

Determine the relative mass for the hypothetical elements Zp and Wq given the following information: The element Xu has an atomic mass of 24.00 jigs. The element Wq is three times lighter than Xu. The element Zp is two and a half times heavier than a Xu.

Which of the following statements is not a part of atomic theory?

What is the atomic number of an isobar of In which there is an equal number of all three types of subatomic particles present?

Place in the blank the letter of the correct response in each horizontal row of choices. -________ Mass number of an isotope containing 45 protons and 58 neutrons

In which of the following pairs of formulas do the two members of the pair contain the same number of elements as well as the same number of atoms?

Which one of the following statements about molecules is correct?

Place in the blank the letter of the correct response in each horizontal row of choices. -________ Number of elements in the compound Al2SO4

In which of the following compounds does one molecule of the compound contain 3 elements and 8 atoms?

Which statement about an atom is false?

Which statement concerning the molecules depicted is incorrect?

How many atoms of each element are present in 3 formula units of (NH4) 2HAsO4?

An isotope of which element is used as the standard for the relative mass scale for atoms?

Chlorine, which exists in nature in two isotopic forms, has an atomic mass of 35.5 amu. This means that ________.

Fill in the blanks in the following sentences using words from the following response list: Items in the response list may be used more than once or need not be used at all. -The mass number for an atom equals the sum of the __________ and __________ in the atom's nucleus.

What is the total number of hydrogen atoms present in 6 formula units of Mg(C2H3O2) 2?

Which of the following properties for the most abundant isotope of an element would not be possessed by the second most abundant isotope of the same element?

Which formula is correct for a molecule with 4 P atoms, and 10 O atoms?

For each description on the left select the correct atom from the response list on the right. Responses may be used more than once or need not be used at all. -________ Has more neutrons than electrons

The diameters and masses of atoms are, respectively, on the order of ________.

Place in the blank the letter of the correct response in each horizontal row of choices. -________ Number of elements in the compound Al₂SO₄

How many atoms of each element are present in 3 formula units of (NH₄) ₂HAsO₄?

Fill in the blanks in the following sentences using words from the following response list: Items in the response list may be used more than once or need not be used at all. -The mass number for an atom equals the sum of the and in the atom's nucleus.

What is the total number of hydrogen atoms present in 6 formula units of Mg(C₂H₃O₂) ₂?