Chemistry Final Exam Review
which is the correct name for the compound (NH4)2SO4?
ammonium sulfate
which type of bond has one pair of electrons shared between atoms?
metallic
which of the following combinations of symbol and explanation of symbol is correct when used in a chemical equation?
(aq) dissolved in water
Which is the charge that results when oxygen becomes an ion?
-2
What is the net charge of the ionic compound calcium fluoride?
0
how many valence electrons are transferred from the nitrogen atom to potassium in the formation of the compound potassium nitride?
0
How many single covalent bonds can halogens form?
1
multiple covalent bonds consist of which of these?
1 sigma bond and 1 or 2 pi bonds
which combination of bonds is present in this molecule? O = O
1 sigma bond and 1 pi bond
what is the charge on the cation in the ionic compound sodium sulfide?
1+
What are the coefficients that will balance the skeleton equation below? AlCl3 + NaOH -> Al(OH)3 + NaCl
1,3,1,3
what are the coefficients that balance the skeleton equation below? N2 + H2 --> NH3
1,3,2
what are the missing coefficients for the skeleton equation below? Al2(SO4)3(aq)+KOH(aq)--> Al(OH)3(aq) + K2SO4(aq)
1,6,2,3
what is the electronegativity difference in the compound Aluminum Chloride, AICI3?
1.55
what is the number of moles in 432 g Ba(NO3)2?
1.65 mol
a compound of BeCI2 uses sp hybrid orbitals of Be atom. which of the following is the correct bond angle in the compound?
180°
how many electrons does barium have to give up to achieve a noble-gas electron configuration?
2
how many single covalent bonds in Column F are likely to form?
2
when the equation KCIO3(s)-->KCI(s) + O2(g) is balanced, the coefficient KCIO3 is
2
when the following equation is balanced, what is the coefficient for HCI? Mg(s)+HCI(aq)--> MgCI2(aq)+H2(g)
2
What are the missing coefficients for the skeleton equation below? Cr(s) + Fe(NO3)2(aq) -> Fe(s) + Cr(NO3)3(aq)
2,3,3,2
what is the percent composition of chromium in BaCrO4?
20.5%
how many valence electrons are available in the ion NO3?
24
in the compound PCI3, how many total valence electrons are present?
26
When the equation Fe + Cl2 --> FeCl3 is balanced, what is the coefficient for Cl2?
3
group 13 elements tend to acquire which charge when they form ions?
3
how many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?
3
how many total shared electron pairs are in a molecule that displays sp2 hybridization?
3
What is the molar mass of AuCl3?
303.6 g
how many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3H7O?
35
Rewrite the following word equation as a balanced chemical equation. What is the coefficient and symbol for fluorine Nitrogen trifluoride -> nitrogen + fluorine
3F2
a sample of manganese (II) chloride has a mass of 19.8 grams before heating, and 12.6 grams after heating until all the water is driven out. based on this information, how many water molecules were attached to each molecule of manganese (II) chloride?
4
how many single covalent bonds can carbon form?
4
how many atoms are in 0.075 mol of titanium?
4.5 x 10^22
how many pairs of bonding electrons are present in a molecule that displays trigonal bipyramidal molecular shape?
5
If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hg in the compound?
71.5%
how many molecules of tungsten atoms are in 4.8 x 10^25 atoms of tungsten?
8.0 x 10^1 moles
What is the molar mass of (NH4)2CO3?
96 g
in order for the reaction 2AI + 6HCI --> 2AICI3 + 3H2 to occur, which of the following must be true?
AI must be above H on the activity series
what is the formula unit of aluminum oxide?
Al2O3
Which covalent molecule has the strongest bond?
B
which of the following compounds is an exception to the octet rule?
BH3
the product of a combination reaction is Ba(OH)2. if one of the reactants is H2O, what is the other reactant?
BaO
which is the correct formula for the compound formed between beryllium and nitrogen?
Be3N2
what is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?
Br2 + NaI2--> 2NaBr + I2
which of the four diagrams below show two atoms which are forming a covalent bond?
C
the empirical formula for a compound is CH2O, and the molar mass is 180.2g/mol. which is the molecular formula for this compound?
C6H12O6
which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7H14?
C7H14 + 14O --> 7CO + 7H2O
the complete combustion of which of the following substances produces carbon dioxide and water?
C8H18
a formula unit of calcium bromide has two bromide ions corresponding to each calcium ion in the compound. What is the formula of calcium bromide?
CaBr2
Which is the correct name for the compound Ca(CIO2)2?
Calcium Chlorite
a double-replacement reaction takes place when aqueous cobalt (III) chloride reacts with aqueous lithium hydroxide. one of the products of this reaction is
Co(OH)3
which is the correct name for the compound CoCO3?
Cobalt(II)Carbonate
which is the correct formula for the compound Chromium (II) Nitrate?
Cr(NO3)2
which of the following statements is correct?
all chemical reactions can be classified as one of five general types
what is the formula of the ion formed when potassium achieves a noble-gas electron configuration?
K+
what is the correct formula for the compound formed between magnesium and the phosphate ion?
Mg3(PO4)2
which is the correct formula for the compound Manganese (III) Fluoride?
MnF3
which is the correct formula for the compound dinitrogen monoxide?
N2O
what is the formula for sodium sulfate?
Na2SO4
what is the formula unit of sodium nitride?
Na3N
the electron configuration of Na is [Ne]3s1 and that of C1 is [Ne]3s23p5. what is the formula of the compound when these elements react?
NaC1
One of the products when aqueous Na2CO3 reacts with aqueous Sn(NO3)2 is
NaNO3
which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
P(s) + O2(g)--> P2O5(s)
what is the formula of the ion formed when phosphorus achieves a noble-gas electron configuration?
P3-
which of the following is a balanced equation representing the decomposition of lead (IV) oxide?
PbO2 --> Pb + O2
Which is the formula for the compound sulfur hexachloride?
SCI6
Which is the formula for the compound sulfur hexachloride?
SCl6
what is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?
SO3
what is true about the molar mass of chlorine gas?
The molar mass is 71.0 g.
what is the driving force in the following reaction? Ni(NO3)2(aq) + K2S(aq) -->
a precipitate is formed
in order to predict whether or not a single-replacement reaction takes place, you need to consult a chart that shows the
activity series of metals
which of the following statements is true about what happens in all chemical reactions?
bonds between atoms are broken and new bonds are formed
which is NOT a diatomic molecule?
boron
The reaction 2Fe + 3Cl2 --> 2FeCl3 is an example of which type of reaction?
combination reaction
the equation H2PO4 + 3KOH--> K3PO3 + 3H2O is an example of which type of reaction?
combustion reaction
which is the correct name for the compound N2O4?
dinitrogen tetroxide
which is the correct name for the compound N2O3?
dinitrogen trioxide
the lowest whole-number ratio of the elements in a compound is called the ________________.
empirical formula
A double bond occupies two hybrid orbitals
false
All compounds with polar covalent bonds are polar molecules.
false
All noble gases have the same valence electron configuration.
false
An expanded octet is possible using the p-orbital of an element
false
In an ionic bond, two cations can bond together to form a compound.
false
a cation is a negatively charged atom
false
all of the bond lengths in a compound having resonating structures are identical
false
electron affinity and electronegativity are opposite of one another
false
electrons in a covalent bond are always shared equally between the two atoms forming the bond.
false
the molecules H2O and CCI4 are nonpolar, as the central atoms, O and C, respectively, are sp3 hybridized.
false
when an atom gains electrons, it becomes positively charged
false
which of the following elements forms an ion with a 1-charge?
flourine
what does the symbol △ above the arrow in a chemical equation mean?
heat is supplied to the reaction
Which is a physical property of ionic compounds in their solid state?
high melting point
which type of bond has an electronegativity difference greater than 1.7?
ionic
a compound composed of cations and anions is called a(n) __________.
ionic compound
Which is the correct name for the compound FeS?
iron (II) sulfide
How does oxygen obey the octet rule when reacting to form compounds?
it gains elctrons
which of the following is true about an ionic compound?
it is composed of anions and cations and yet it is electrically neutral
in a double-replacement reaction, one of the products
may be a solid metal
Use the activity series of metals to complete a balanced chemical equation for the following single replacement reaction. Ag(s) + KNO3(aq) -->
no reaction takes place because silver is less reactive than potassium
a catalyst is
not used up in a reaction
In the activity series of metals, which metal(s) will displace hydrogen from an acid?
only metals above hydrogen
which of the following occurs in an ionic bond?
oppositely charged ions attract
in a combustion reaction, one of the reactants is
oxygen
which is the correct name for the compound PCI5?
phosphorus pentachloride
which is the correct name for the compound PCl5?
phosphorus pentachloride
Based on its electronegativity difference, which kind of bond is present in the compound OF2?
polar covalent
chemical reactions
produce new substances
in a double-replacement reaction, the
reactants are two ionic compounds
A skeleton equation shows just the reactants and products whereas a balanced equation shows the
relative amounts of reactants and products
net ionic equation
shows only those particles involved in the reaction
The equation Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) is an example of which type of reaction?
single-replacement reaction
Which is the correct name for the compound Na3P?
sodium phosphide
which exception to the octet rule is shown by this molecule?
suboctet
What molecular shape does the compound CCl4 have?
tetrahedral
which is true of the bond length of these covalent molecules?
the bonds in A are longer than the bonds in B or C
chemical equations must be balanced to satisfy
the law of conservation of mass
which of the following statements is true about the decomposition of simple binary compound?
the reactant is a single substance
in a double-replacement reaction,
the reactants are generally two ionic compounds in aqeueous solution
covalent compounds display which of these properties?
their inter molecular forces are relatively week
Which is true of binary ionic compounds?
they consist of atoms of only two elements
which type of molecular shape is shown by this molecule? 90°/120°
trigonal bipyramidal
which type of molecular shape is shown by this molecule? 120°
trigonal planar
A sigma bond is formed between two atoms when the valence atomic orbital of one atom overlaps end-to-end with that of the other atom
true
Phosphide is the name of the anion formed when phosphorus gains three electrons.
true
a diatomic molecule is one that is made of only two different elements
true
electron affinity is the likelihood of an atom to accept an electron
true
hybrid orbitals result from the mixing of atomic orbitals to hold lone electron pairs and single electrons available for bonding
true
in covalent compounds, atoms become chemically stable by sharing their valency electrons
true
metallic elements tend to form cations rather than anions
true
noble gases are generally non-reactive because they already have a complete valence shell
true
the products of a combustion reaction include
water, carbon dioxide, and carbon monoxide