Question 1

What is the correct number of atoms in one mole of aluminum?

Accepted Answer

A) 12 
B) 26.98 
C) 6.022 × 1023 
D) 13 
E) 14 
A) 12 
B) 26.98 
C) 6.022 × 1023 
D) 13 
E) 14

Question 2

Which of these elements is a metalloid?

Accepted Answer

A) Ge 
B) Br 
C) Ar 
D) Ca 
E) Fe 
A) Ge 
B) Br 
C) Ar 
D) Ca 
E) Fe

Question 3

Determine the mass of one mole of silver.

Accepted Answer

A) 107.87 amu 
B) 107.87 g 
C) 47 amu 
D) 47 g 
E) 6.022 × 1023 amu 
A) 107.87 amu 
B) 107.87 g 
C) 47 amu 
D) 47 g 
E) 6.022 × 1023 amu

Question 4

The most abundant element in the earth's crust by mass is:

Accepted Answer

A) Hydrogen 
B) Carbon 
C) Oxygen 
D) Silicon 
E) Nitrogen 
A) Hydrogen 
B) Carbon 
C) Oxygen 
D) Silicon 
E) Nitrogen

Question 5

Which of the following is true?

Accepted Answer

A) Oxygen and sulfur are in the same group. 
B) Oxygen and sulfur are in different groups. 
C) Oxygen and sulfur are in the same period. 
D) Oxygen and sulfur are in different periods. 
E) Both A and D are correct. 
A) Oxygen and sulfur are in the same group. 
B) Oxygen and sulfur are in different groups. 
C) Oxygen and sulfur are in the same period. 
D) Oxygen and sulfur are in different periods. 
E) Both A and D are correct.

Question 6

Which of these particles has a negative charge?

Accepted Answer

A) Proton 
B) Neutron 
C) Electron 
D) Nucleus 
E) An atom 
A) Proton 
B) Neutron 
C) Electron 
D) Nucleus 
E) An atom

Question 7

Which of these statements about an atom is incorrect ?

Accepted Answer

A) The number protons equals the number of electrons. 
B) The number of protons equals the atomic number. 
C) The number of protons equals the number of neutrons. 
D) The mass number is the sum of protons and neutrons in the atom. 
E) The mass number minus the atomic number equals the number of neutrons in the atom. 
A) The number protons equals the number of electrons. 
B) The number of protons equals the atomic number. 
C) The number of protons equals the number of neutrons. 
D) The mass number is the sum of protons and neutrons in the atom. 
E) The mass number minus the atomic number equals the number of neutrons in the atom.

Question 8

Copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and Cu-65 has a mass of 64.928 amu. Based on the atomic mass of copper, which isotope has a higher fractional abundance?

Accepted Answer

A) Cu-63 
B) Cu-65 
C) Both have the same fractional abundance. 
D) Not enough information to tell. 
A) Cu-63 
B) Cu-65 
C) Both have the same fractional abundance. 
D) Not enough information to tell.

Question 9

Which of these is the correct chemical symbol for carbon?

Accepted Answer

A) C 
B) Ca 
C) Cl 
D) Cb 
E) Co 
A) C 
B) Ca 
C) Cl 
D) Cb 
E) Co

Question 10

Which statement about electrons is incorrect ?

Accepted Answer

A) Electrons are negatively charged. 
B) Electrons have a negligible mass compared to the rest of the atom. 
C) Electrons exist in the nucleus of the atom. 
D) The number of electrons equals the atomic number in a neutral atom. 
E) Both B and D are incorrect statements. 
A) Electrons are negatively charged. 
B) Electrons have a negligible mass compared to the rest of the atom. 
C) Electrons exist in the nucleus of the atom. 
D) The number of electrons equals the atomic number in a neutral atom. 
E) Both B and D are incorrect statements.

Question 11

When a strontium atom loses two electrons, it becomes a(n)_____ with a charge of _____.

Accepted Answer

A) anion, 2+ 
B) anion, 2 −  
C) cation, 2 −  
D) cation, 2+ 
E) cation, 0 
A) anion, 2+ 
B) anion, 2 −  
C) cation, 2 −  
D) cation, 2+ 
E) cation, 0

Question 12

The number of protons in a neutral atom is equal to the _____ of the atom.

Accepted Answer

A) mass 
B) atomic weight 
C) atomic number 
D) mass number 
E) valence electron number 
A) mass 
B) atomic weight 
C) atomic number 
D) mass number 
E) valence electron number

Question 13

Nonmetals tend to _____ electrons to form ions of _____ charge.

Accepted Answer

A) lose, negative 
B) lose, positive 
C) gain, positive 
D) gain, negative 
A) lose, negative 
B) lose, positive 
C) gain, positive 
D) gain, negative

Question 14

Elements in the same group have the same _____.

Accepted Answer

A) mass number 
B) atomic number 
C) number of protons 
D) number of electrons 
E) number of valence electrons 
A) mass number 
B) atomic number 
C) number of protons 
D) number of electrons 
E) number of valence electrons

Question 15

Mendeleev organized the elements of the periodic table

Accepted Answer

A) by increasing atomic number and similar properties. 
B) by increasing atomic weight and similar properties. 
C) by increasing number of electrons. 
D) by increasing number of isotopes. 
E) alphabetically. 
A) by increasing atomic number and similar properties. 
B) by increasing atomic weight and similar properties. 
C) by increasing number of electrons. 
D) by increasing number of isotopes. 
E) alphabetically.

Question 16

Determine the mass in grams of 3.45 × 1025 molecules of oxygen, O2.

Accepted Answer

A) 0.556 grams 
B) 57.2 grams 
C) 458 grams 
D) 916 grams 
E) 1.83 × 103 grams 
A) 0.556 grams 
B) 57.2 grams 
C) 458 grams 
D) 916 grams 
E) 1.83 × 103 grams

Question 17

Determine the number of atoms in a piece of ultrapure silicon that has a mass of 15.0 grams.

Accepted Answer

A) 1.13 × 1024 atoms 
B) 1.69 × 1025 atoms 
C) 2.54 × 1020 atoms 
D) 3.21 × 1023 atoms 
E) 9.03 × 1024 atoms 
A) 1.13 × 1024 atoms 
B) 1.69 × 1025 atoms 
C) 2.54 × 1020 atoms 
D) 3.21 × 1023 atoms 
E) 9.03 × 1024 atoms

Question 18

How many protons (p), neutrons (n), and electrons (e)are in an atom of 235U?

Accepted Answer

A) 92 p, 146 n, 92 e 
B) 92 p, 143 n, 92 e 
C) 92 p, 92 n, 146 e 
D) 92 p, 92 n, 92 e 
E) 92 p, 51 n, 92 e 
A) 92 p, 146 n, 92 e 
B) 92 p, 143 n, 92 e 
C) 92 p, 92 n, 146 e 
D) 92 p, 92 n, 92 e 
E) 92 p, 51 n, 92 e

Question 19

How many protons, neutrons, and electrons are in an 25Mg+2 ion?.

Accepted Answer

A) 12 protons, 12 electrons, 13 neutrons 
B) 12 protons, 10 electrons, 12 neutrons 
C) 13 protons, 10 electrons, 12 neutrons 
D) 12 protons, 10 electrons, 13 neutrons 
E) 12 protons, 14 electrons, 13 neutrons 
A) 12 protons, 12 electrons, 13 neutrons 
B) 12 protons, 10 electrons, 12 neutrons 
C) 13 protons, 10 electrons, 12 neutrons 
D) 12 protons, 10 electrons, 13 neutrons 
E) 12 protons, 14 electrons, 13 neutrons

Question 20

Which of these is the correct chemical symbol for cobalt?

Accepted Answer

A) C 
B) Cl 
C) Co 
D) Ca 
E) Ce 
A) C 
B) Cl 
C) Co 
D) Ca 
E) Ce

What is the correct number of atoms in one mole of aluminum?

Which of these elements is a metalloid?

Determine the mass of one mole of silver.

The most abundant element in the earth's crust by mass is:

Which of the following is true?

Which of these particles has a negative charge?

Which of these statements about an atom is incorrect ?

Copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and Cu-65 has a mass of 64.928 amu. Based on the atomic mass of copper, which isotope has a higher fractional abundance?

Which of these is the correct chemical symbol for carbon?

Which statement about electrons is incorrect ?

When a strontium atom loses two electrons, it becomes a(n)_ with a charge of _.

The number of protons in a neutral atom is equal to the _____ of the atom.

Nonmetals tend to _ electrons to form ions of _ charge.

Elements in the same group have the same _____.

Mendeleev organized the elements of the periodic table

Determine the mass in grams of 3.45 × 10²⁵ molecules of oxygen, O_2.

Determine the number of atoms in a piece of ultrapure silicon that has a mass of 15.0 grams.

How many protons (p), neutrons (n), and electrons (e)are in an atom of ²³⁵U?

How many protons, neutrons, and electrons are in an ²⁵Mg⁺² ion?.

Which of these is the correct chemical symbol for cobalt?

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Exam 3: Atoms and Elements

What is the correct number of atoms in one mole of aluminum?

Which of these elements is a metalloid?

Determine the mass of one mole of silver.

The most abundant element in the earth's crust by mass is:

Which of the following is true?

Which of these particles has a negative charge?

Which of these statements about an atom is incorrect ?

Copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and Cu-65 has a mass of 64.928 amu. Based on the atomic mass of copper, which isotope has a higher fractional abundance?

Which of these is the correct chemical symbol for carbon?

Which statement about electrons is incorrect ?

When a strontium atom loses two electrons, it becomes a(n)_____ with a charge of _____.

The number of protons in a neutral atom is equal to the _____ of the atom.

Nonmetals tend to _____ electrons to form ions of _____ charge.

Elements in the same group have the same _____.

Mendeleev organized the elements of the periodic table

Determine the mass in grams of 3.45 × 1025 molecules of oxygen, O2.

Determine the number of atoms in a piece of ultrapure silicon that has a mass of 15.0 grams.

How many protons (p), neutrons (n), and electrons (e)are in an atom of 235U?

How many protons, neutrons, and electrons are in an 25Mg+2 ion?.

Which of these is the correct chemical symbol for cobalt?

Molecular Reasons

The Chemists Toolbox

Molecules, Compounds, and Chemical Reactions

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology

Filters

When a strontium atom loses two electrons, it becomes a(n)_ with a charge of _.

Nonmetals tend to _ electrons to form ions of _ charge.

Determine the mass in grams of 3.45 × 10²⁵ molecules of oxygen, O_2.

How many protons (p), neutrons (n), and electrons (e)are in an atom of ²³⁵U?

How many protons, neutrons, and electrons are in an ²⁵Mg⁺² ion?.