chem test 5
The number of electrons in an ion with 20 protons and an ionic charge of 2+ is
18
How many lone pairs of electrons are in the electron-dot structure of H2O?
2
Elements in group 2A(2) of the periodic table form ions with a charge of
2+
How many valence electrons are in the electron-dot structures for the elements in group 3A(13)?
3
What is the ionic charge of an ion with 13 protons and 10 electrons?
3+
How many valence electrons are in the electron-dot structure of CCl4?
32
The number of electrons in the highest energy level of carbon is
4
The number of electrons in the highest energy level of nitrogen is
5
How many valence electrons are in the electron-dot structure of H2O?
8
What is the formula for aluminum nitrite?
Al(NO2)3
The correct formula for a compound formed from the elements Al and O is
Al2O3 .
The ion of aluminum is
Al3+
What is the formula of carbon tetraiodide?
CI4
Which of the following compounds contains an ionic bond?
CaO
The name of the Cu+ ion is
Copper (I)
Which one of the following elements forms two or more ions with different ionic charges?
Fe
What is the correct formula for the iron 2 ion?
Fe2+
What is the correct formula for iron 3 sulfide?
Fe2S3
Which one of the following compounds contains an ion with a 3+ charge?
FeCl3
A polar covalent bond is found in which of these compounds?
H2O
Which of the following compounds contains a polar covalent bond?
Hcl
The name of the HSO4- ion is
Hydrogen Sulfate
What is the symbol for the ion with 19 protons and 18 electrons?
K+
Ionic bonding is expected in which of these compounds?
KF
Which of the following elements has the lowest electronegativity?
Li
The correct formula for the compound formed from Mg and S is
MgS
Which of the following substances contains a nonpolar covalent bond?
N2
What is the formula of the nitride ion?
N3-
The formula for a molecule formed from N and Cl would be
NCl3
What is the formula of a compound that contains Na+ and PO43- ions?
Na3PO4
What is the correct formula for the oxide ion?
O2-
The carbon tetrachloride molecule, CCl4, is
a nonpolar molecule with polar bonds.
The ammonia molecule ( NH3 ) is
a polar molecule with polar bonds
The name of Al2(SO4)3 is
aluminum sulfate
Which of the following polyatomic ions has a positive charge?
ammonium
In a molecule with covalent bonding
atoms are held together by sharing electrons
The octet rule indicates that
atoms lose, gain, or share valence electrons to have 8 valence electrons
The shape of the water molecule (H2O) is
bent
Which of the following elements does NOT exist as a diatomic molecule?
carbon
The types of compounds that use prefixes in their names are
covalent compounds
The correct name for the compound N2O3 is
dinitrogen trioxide
The strongest interactions between molecules of hydrogen chloride are
diople-dipole interactions
The main interactions between molecules of iodine 12 are examples of
dispersion forces
The strongest interactions between molecules of hydrogen (H2) are
dispersion forces
The ability of an atom to attract the shared electrons in a covalent bond is its
electronegativity
How many electrons will chlorine gain or lose when it forms an ion?
gain 1
An anion always
has a negative charge
An ionic compound
has a net charge of zero
The strongest interactions between molecules of ammonia (NH3) are
hydrogren bonds
Valence electrons are electrons located
in the outermost energy level of an atom
If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is
ionic
Fe2(SO4)3 is called
iron (III) sulfate
The number of valence electrons found in an atom of a Group A element is equal to
its group number
The shape of the carbon dioxide (CO2) is
linear
How many electrons will aluminum gain or lose when it forms an ion?
lose 3
To form an ion, a sodium atom
loses one electron
The compound MgCl2 is named
magnesium chloride
In ionic compounds, lose their valence electrons to form positively charged
metals; cations
A(n) is the smallest neutral unit of two or more atoms held together by a covalent bond.
molecule
In a covalently bonded molecule, the number of electrons that an atom shares with others is usually equal to the number of electrons
needed to give it a stable electron configuration
The correct name of the compound NCl3 is
nitrogen trichloride
The bond in Cl2 is a(n)
nonpolar covalent bond
Which of the following polyatomic ions has a 3- ionic charge?
phosphate
The water molecule has a dipole with the negative portion
pointing toward the oxygen atom.
A group of covalently bonded atoms that has an overall electrical charge is called a(n)
polyatomic ion
The shape of the ammonia molecule (NH3) is
pyramidal
The VSEPR theory allows us to determine the most favorable
shape of a molecule
Double and triple bonds form because
single covalent bonds do not give all of the atoms in the molecule eight valence electrons.
The shape of the carbon tetrachloride molecule is
tetrahedral
The carbon tetrachloride molecule, CCl4, has the shape of a
tetrahedron
In an electron-dot structure of an element, the dots are used to represent
the valence electrons
Hydrogen sulfide, H2S, has a shape similar to
water
