Chapter 8 Quiz
A Magnesium atom is most likely to have what charge as an ion?
+2
How many valence electrons are in a carbon dioxide (CO2) molecule?
16
What would be the correct Lewis dot diagram for arsenic trifluoride AsF3?
1As/26 Dots/F 3
How many dots would you put around carbon, a group IVA element?
4
If a silicon atom has four valence electrons, what is the maximum number of bonds it can form?
4
What is the correct Lewis dot diagram for CH4?
4 H /8 Dots /1 C
How many dots should be around an elemental symbol in a Lewis dot diagram if it has a full octet?
8
How many total dots should the diagram for silicon tetrahydride, SiH4 include?
8
How do you represent a triple bond in a structural formula?
::: or three horizontal lines
What is a binary compound?
A compound composed of only two elements.
Which is the best definition of a covalent compound?
A compound formed from the sharing of electrons between two or more nonmetal atoms.
An ionic compound is formed by what?
A metal cation and a non-metal anion
What is the octet rule?
A rule that says atoms like to have full valence shells of eight electrons.
Which of the following is MOST likely to result in a hydrogen bond?
A water molecule with another water molecule
How does an atom try to fill its valence shell?
All answers are correct.
What is an anion?
An atom that has gained a valence electron and is negatively charged.
What is a valence electron?
An electron at the highest occupied energy level of an atom
An ionic bond occurs when a _____ and an _____ come together and form a bond.
Cation: Anion
If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?
Dihydrogen
What is the correct name for N2O5?
Dinitrogen pentoxide
What charge do group IVA atoms have when they become ions?
Either +4 or -4, but they don't usually become ions.
Which of the following statements is true regarding hydrogen bonds?
Hydrogen bonds are weaker than covalent and ionic bonds.
Which of the following statements is true? I. In an ionic bond, electrons move toward the atom that is more electronegative. II. A cation is a negatively charged atom. III. A positively charged atom is called an anion. IV. Under biological conditions, ionic bonds are stronger than covalent bonds.
I
If a carbon atom has four valence electrons, which of the following statements are true? I. Carbon can form a triple covalent bond with another carbon atom. II. A carbon atom cannot form two double bonds simultaneously. III. A carbon atom can form four single covalent bonds simultaneously.
I and III
What differentiates a nonpolar covalent bond from a polar covalent bond? I. Unequal sharing of electrons II. Ions III. Atoms of partial charge
I and III
Hydrogen bonds occur between hydrogen in one polar molecule and _____ in another polar molecule. I. Oxygen II. Fluorine III. Nitrogen
I, II, and III
Which of the following statements are true? I. Noble gases complete their valence level by sharing electrons. II. Covalent bonds are weak and easily broken. III. Covalent bonds allow us to make predictions on how the molecule will look.
III
When is it possible to form multiple bonds with the same partner atom?
If the atom has enough valence electrons
What type of bond forms when atoms have highly different electronegativities?
Ionic Bond
How are ions formed?
Ions are formed when neutral atoms gain or lose electrons to become positively or negatively charged.
What is the correct name for Fe(OH)3?
Iron (III) hydroxide
In chemistry, the Greek letter delta:
Is a symbol which designates difference or change.
What is the correct name for MgCl2?
Magnesium chloride
Which of the following will most likely have the highest lattice energy?
MgO +2, -2 charge
Which of the following is an example of an ionic compound?
NaCl
Two atoms with the same electronegativity would form what kind of bond?
Nonpolar covalent
How many bonds can hydrogen form?
One
A cation has a _____ charge.
Positive
Electron clouds:
Predict where electrons will be found around an atom or molecule.
Which of the following atoms is most likely to participate in an ionic bond with chlorine, an atom with 7 valence electrons?
Sodium (1 valence electron)
What is usually the first step when drawing a Lewis dot structure?
Summing the number of valence electrons.
Which of the following is NOT a property of covalent compounds?
Superior malleability
What is wrong with the Lewis dot structure for IO-?
The bond between I and O should be represented with a single line.
What does the charge on a polyatomic ion mean?
The charge on a polyatomic ion is equivalent to the number of electrons the parent molecule must lose or gain to achieve the octet rule.
What do you look at in the periodic table to determine the number of valence electrons possessed by an element?
The element's group number.
When naming a binary compound, what determines the prefix for an element in the compound?
The number of atoms of that element in the compound.
Which of the following best describes the octet rule?
The outermost energy shell of an atom likes to be full with eight electrons.
What does a Lewis dot diagram allow you to show?
The valence electrons in an element.
How is an ionic bond formed?
Through the transfer of electrons
Which are the outermost electrons of an atom?
Valence electrons
A polar molecule, such as the one involved in a hydrogen bond, is sometimes called _____.
a dipole
A hydrogen bond is _____.
an intermolecular force
If an ionic compound contains a transition metal, Roman numerals are used to determine the _____.
charge on the ion
Which of the following is a property of an ionic compound?
crystal lattice structure
An anion has a(n) _____ charge.
negative
