Chemistry Test
What causes water molecules to have a bent shape, according to VSEPR theory?
repulsive forces between unshared pairs of electrons
Ionic compounds are normally in which physical state at room temperature?
solid
SCl2
sulfur dichloride
What is shown by the structural formula of a molecule or polyatomic ion?
the arrangement of bonded atoms
The octet rule states that, in chemical compounds, atoms tend to have...
the electron configuration of a noble gas
What is the correct name for Sn3(PO4)2?
tin (ii) phosphate
Which set of chemical name and chemical formula for the same compound is correct?
tin (iv) bromide, SnBr4
Why do atoms share electrons in covalent bonds?
to attain a noble-gas electron configuration
According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible?
valence electron pairs
How many electrons does silver have to give up in order to achieve a pseudo-noble-gas electron configuration?
1
The electron configuration of a fluoride ion, F-, is...
1s2 2s2 2p5
What is the electron configuration of the gallium ion?
1s2 2s2 2p6 3s2 3p6 3d10
How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide?
2
What is the charge on the cation in the ionic compound sodium sulfide?
2+
What is the correct formula for barium chlorate?
Ba(ClO3)2
Which of the following formulas represents an ionic compound?
BaI2
Which of the following correctly represents an ion pair and the ionic compound the ions form?
Ca2-, F-; CaF2
What is the formula of the ion formed when cadmium achieves a pseudo-noble-gas electron configuration?
Cd(2+)
Which of the following covalent bonds is the most polar?
H-F
Which of the following is true about an ionic compound?
It is composed of anions and cations and yet it is electrically neutral.
What is the correct formula for potassium sulfite?
K2SO3
What is the formula unit of sodium nitride?
Na3N
Which of the following occurs in an ionic bond?
Oppositely charged ions attract.
Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen?
Oxygen
What is the formula of the ion formed when phosphorus achieves a noble-gas electron configuration?
P3-
Select the correct formula for sulfur hexafluoride.
SF6
Which of the following formulas represents a molecular compound?
SO2
The molecular formula for the compound hydrogen cyanide is HCN. What information does the molecular formula provide about hydrogen cyanide?
The formula HCN indicates that a molecule of hydrogen cyanide contains one hydrogen atom, one carbon atom, and one nitrogen atom.
What characteristic of metals makes them good electrical conductors?
They have mobile valence electrons.
An ionic bond is a bond between...
a cation and an anion
An -ate or -ite at the end of a compound name usually indicates that the compound contains...
a polyatomic anion.
Most ionic compounds...
are crystalline solids at room temperature
BaF2
barium fluoride
Sulfur hexafluoride is an example of a...
binary compound
Which of the following correctly provides the names and formulas of polyatomic ions?
chromate: CrO4 (2-); dichromate Cr2O7 (2-)
What is the correct name for the compound CoCI2?
cobalt (ii) chloride
CuBr2
copper (ii) bromide
Which of the following is the correct name for N2O5?
dinitrogen pentoxide
The ions formed by nonmetals in Groups 6A and 7A
have a numerical charge that is found by subtracting 8 from the group number.
When placed between oppositely charged metal plates, the region of a water molecule attracted to the negative plate is the...
hydrogen region of the molecule
Which set of chemical name and chemical formula for the same compound is correct?
iron (iii) phosphate; FePO4
Under what conditions can potassium bromide conduct electricity?
only when melted or dissolved in water
