Category A
Category B
Category C
Category D
Category E
100
Question 1: What best explains whether fluorine (F) or argon (Ar) is more likely to form a covalent bond?
A. Fluorine forms covalent bonds because it has seven valence electrons, but argon has eight valence electrons and already fulfills the octet rule.
B. Fluorine forms covalent bonds because it has many electron shells, but argon has only three electron shells and is tightly bound to its electrons.
C. Argon forms covalent bonds because it can share its valence electrons, but fluorine has seven valence electrons and can gain only one more electron.
D. Argon forms covalent bonds because it has only three electron shells, but fluorine has many electron shells and will lose electrons in order to fulfill the octet rule
A. Fluorine forms covalent bonds because it has seven valence electrons, but argon has eight valence electrons and already fulfills the octet rule.
100
Question 6: The compound indium chloride is often used in coatings for mirrors. Which of the following best describes the chemical formula of indium chloride?
A. InCl
B. InCl3
C. In2Cl3
D. In3Cl
B. InCl3
100
Question 11: Which compound is ionic?
A. KCl
B. PCl3
C. CO2
D. NH3
A. KCl
100
Question 16: Rita wanted to write the chemical name of NO3. What prefix should be used for the Nitrogen atom when naming this compound?
A. mono-
B. none
C. di-
D. tri-
B. none
100
Question 21: Sodium and sulfur combine to form an ionic compound Na2S. What is the name of this compound?
A. sulfur sodiate
B. sodium sulfide
C. sodium sulfate
D. sodium sulfur
B. sodium sulfide
200
Question 2: The table describes the properties of four compounds.
Compound A: High Melting Point, High Boiling Point, Dissolves in water, Conduct electricity.
Compound B: Low Melting Point, Low Boiling Point, Dissolves in water, Poorly Conduct electricity.
Compound C: Low Melting Point, Low Boiling Point, Dissolves in water, Does not Conduct electricity.
Compound D: High Melting Point, High Boiling Point, Dissolves in water, Conduct electricity.
Compound A & D
200
Question 7: In the electron dot formula for sulfur dioxide (SO₂), which of the following would be the MOST ACCURATE description of the bonds formed between the sulfur atom and the oxygen atoms?
A. This is an example of ionic bond formation. The sulfur atom loses two electrons to each oxygen atom.
B. This is an example of ionic bond formation. The sulfur atom gains two electrons from each oxygen atom.
C. This is an example of covalent bond formation. A total of 4 electrons are shared between each oxygen atom and the sulfur atom.
D. This is an example of covalent bond formation. A total of 2 electrons are shared between each oxygen atom and the sulfur atom.
C. This is an example of covalent bond formation. A total of 4 electrons are shared between each oxygen atom and the sulfur atom.
200
Question 12: Which group of elements naturally satisfies the octet rule and typically does not form compounds?
A. Transition metals
B. Alkali metals
C. Alkaline-earth metals
D. Noble gases
D. Noble gases
200
Question 17: Which part of a chemical formula indicates the number of atoms of an element?
A. Atomic number
B. Atomic mass
C. Charge
D. Subscript
D. Subscript
200
Question 22: Which of the following correctly describes the properties of all ions?
A. Ions are metals and are always positively charged.
B. Ions carry a charge, which can be positive or negative, and they can conduct electricity.
C. Ions are made of two or more different atoms and have no charge.
D. Ions form bonds by sharing electrons and do not conduct electricity.
B. Ions carry a charge, which can be positive or negative, and they can conduct electricity.
300
Question 3: According to the octet rule, why do atoms form bonds?
A. Atoms bond to achieve a stable set of eight valence electrons.
B. Atoms bond to give up eight valence electrons and gain stability.
C. Atoms bond to gain eight valence electrons and become unstable.
D. Atoms bond to lose eight valence electrons and become unstable.
A. Atoms bond to achieve a stable set of eight valence electrons.
300
Question 8: Based on the periodic table, which of the following pairs of atoms would most likely form bonds with the atoms in a 1 to 1 ratio?
A. Potassium and chlorine
B. Magnesium and chlorine
C. Barium and fluorine
D. Lithium and oxygen
A. Potassium and chlorine
300
Question 13: Which of the following correctly matches each chemical name with its formula?
A. Sodium chloride → NaCl, Magnesium oxide → MgO₂, Carbon dioxide → CO
B. Sodium chloride → Na₂Cl, Magnesium oxide → MgO, Carbon dioxide → CO₂
C. Sodium chloride → NaCl, Magnesium oxide → MgO, Carbon dioxide → CO₂
D. Sodium chloride → NaCl₂, Magnesium oxide → Mg₂O₂, Carbon dioxide → CO₂
C. Sodium chloride → NaCl, Magnesium oxide → MgO, Carbon dioxide → CO₂
300
Question 18: Jordan is unsure how to name the compound P₂O₅. He knows he must first determine whether it is ionic or covalent and then apply the proper naming rules. Which of the following is correct?
A. It is ionic; the name is phosphorus oxide
B. It is ionic; the name is diphosphorus oxide
C. It is covalent; the name is phosphorus pentoxide
D. It is covalent; the name is diphosphorus pentoxide
D. It is covalent; the name is diphosphorus pentoxide
300
Question 23: The Lewis dot diagrams of potassium (K) shows 1 Valence Electron and sulfur (S) shows 6 valence electrons. Using this information, what is the correct formula for the ionic compound formed between these two elements?
A. K₂S
B. KS
C. K₂S₂
D. K₃S
A. K₂S
400
Question 4: An atom of sodium (Na) forms an ionic bond with an atom of fluorine (F) to form sodium fluoride. How are the valence electrons of these atoms rearranged to form this bond?
A. A few valence electrons are shared between the atoms.
B. Many valence electrons are shared between the atoms.
C. Electrons are transferred from the fluorine atom to the sodium atom.
D. Electrons are transferred from the sodium atom to the fluorine atom.
D. Electrons are transferred from the sodium atom to the fluorine atom
400
Question 9: In the formation of the compound calcium oxide (CaO),
A. A calcium atom donates two electrons to an oxygen atom.
B. An oxygen atom shares one electron with a calcium atom.
C. A calcium atom shares two electrons with an oxygen atom.
D. An oxygen atom donates one electron to a calcium atom.
A. A calcium atom donates two electrons to an oxygen atom.
400
Question 14: Diego claims that a single potassium ion and a single oxygen ion do not bond together to form a stable binary ionic compound. Is he correct? Why or why not?
A. Diego is incorrect. The two ions have opposite charges, so they will bond together in a binary ionic compound.
B. Diego is incorrect. The two ions have more than eighteen protons, so they will bond together in a binary ionic compound.
C. Diego is correct. The sum of the charges of the two ions must be zero in order for them to form a stable ionic compound.
D. Diego is correct. The sum of the protons of the two ions must be divisible by eight in order for them to form a stable ionic compound.
C. Diego is correct. The sum of the charges of the two ions must be zero in order for them to form a stable ionic compound.
400
Question 19: Examine the chemical formula SCl₂. How can you determine that the bond between sulfur and chlorine is covalent?
A. Sulfur is a metal and chlorine is a metalloid; a bond forms between a metal and a metalloid.
B. Sulfur is a metal and chlorine is a nonmetal; a bond forms between a metal and a nonmetal.
C. Sulfur is a nonmetal and chlorine is a nonmetal; a bond forms between two nonmetals.
D. Sulfur is a metal and chlorine is a metal; a bond forms between two metals.
C. Sulfur is a nonmetal and chlorine is a nonmetal; a bond forms between two nonmetals.
400
Question 24: Marcus wants to know what type of a compound ammonia (NH3) is. The boiling point of ammonia is –33 °C and the melting point is –78 °C.
Which BEST predicts whether ammonia is an ionic compound or a covalent compound?
A. Ammonia is more likely an ionic compound because it has a low melting point.
B. Ammonia is more likely an ionic compound because it has a high melting point.
C. Ammonia is more likely a covalent compound because it has a low melting point.
D. Ammonia is more likely a covalent compound because it has a high melting point.
C. Ammonia is more likely a covalent compound because it has a low melting point.
500
Question 5: Sam drew the electron dot diagram of a magnesium atom as shown.
Mg.
How should Sam correct his diagram?
A. He should add six more dots so that the atom obeys the octet rule.
B. He should add ten more dots so that all twelve electrons are shown.
C. He should add a single dot below the symbol.
D. He should add one dot below and one dot to the left of the symbol.
C. He should add a single dot below the symbol.
500
Question 10: The pair of elements that form a covalent bond with the least ionic character are
A. H and Cl
B. Li and F
C. C and H
D. N and O
C. C and H
500
Question 15: Which of the following is the correct way to write the formula for the compound dinitrogen tetroxide?
A. N2O3
B. NO4
C. N4O
D. N2O4
D. N2O4
500
Question 20: Sodium forms a +1 ion, magnesium forms a +2 ion, chlorine forms a −1 ion, and oxygen forms a −2 ion. Based on these charges, which of the following is a correct formula for an ionic compound?
A. NaCl
B. MgCl₂
C. Na₂O
D. All of the above
D. All of the above
500
Question 25: In a chemical formula, the ion’s charge is shown as the _________, and the number of atoms of an element is shown as the _________.
A. Superscript, coefficient
B. Product, superscript
C. Superscript, subscript
D. Subscript, superscript
C. Superscript, subscript