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Chem Final

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A chemical formula for a molecular compound represents the composition of
a molecule
How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF4?
4
What is the formula for zinc fluoride?
ZnF2
Name the compound Zn3(PO4)2.
zinc phosphate
Name the compound KClO3.
potassium chlorate
Name the compound Fe(NO3)2.
iron(II) nitrate
Name the compound CF4.
carbon tetrafluoride
Name the compound N2O3.
dinitrogen trioxide
What is the formula for silicon dioxide?
SiO2
What is the formula for dinitrogen trioxide?
N2O3
What is the sum of the atomic masses of all the atoms in a formula for a compound?
formula mass
What is the formula mass of ethyl alcohol, C2H5OH?
46.08 amu
What is the formula mass of (NH4)2SO4?
132.16 amu
The molar mass of LiF is 25.94 g/mol. How many moles of LiF are present in 10.37 g?
0.3998 mol
How many Mg2+ ions are found in 1.00 mol of MgO?
6.02 X 10^23
What is the percentage composition of CF4?
13.6% C, 86.4% F
A formula that shows the simplest whole-number ratio of the atoms in a compound is the
empirical formula.
What is the empirical formula for a compound that is 53.3% O and 46.7% Si?
SiO2
A compound contains 259.2 g of F and 40.8 g of C. What is the empirical formula for this compound?
CF4
A compound contains 64 g of O and 8 g of H. What is the empirical formula for this compound?
H2O
What is the empirical formula for a compound that is 36.1% Ca and 63.9% Cl?
CaCl2
A compound contains 27.3 g of C and 72.7 g of O. What is the empirical formula for this compound?
N2O5
A compound's empirical formula is N2O5. If the formula mass is 108 amu, what is the molecular formula?
N2O5
A compound's empirical formula is NO2. If the formula mass is 92 amu, what is the molecular formula?
N2O5
What is the small whole number that appears in front of a formula in a chemical equation?
a coefficient
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and in the products
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
C + O2 ® CO2 c. CO2 ® C + O2 d. 2C + O ® CO2
In the chemical equation 2Mg(s) + O2(g) ? 2MgO(s),
Mg represents the reagent magnesium
In an equation, the symbol for a substance in water solution is followed by
(aq)
Which coefficients correctly balance the formula equation CaO + H2O ->Ca(OH)2?
1,1,1
What is the balanced equation for the combustion of sulfur?
S(s) + O2(g) --> SO2(g)
In what kind of reaction do two or more substances combine to form a new compound?
synthesis reaction
In what kind of reaction does a single compound produce two or more simpler substances?
decomposition reaction
The equation A + BX ® AX + B is the general equation for a
single-displacement reaction.
The reaction represented by the equation 2Mg(s) + O2(g) ® 2MgO(s) is a
synthesis reaction.
The reaction represented by the equation Mg(s) + 2HCl(aq) ® H2(g) + MgCl2(aq) is a
single-displacement reaction.
The reaction represented by the equation 2HgO(s) ® 2Hg(l) + O2(g) is a(n)
decomposition reaction
In the equation 2Al(s) + 3Fe(NO3)2(aq) ® 3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by
aluminum
The ability of an element to react is the element's
activity
An element in the activity series can replace any element
below it on the list
Predict what happens when calcium metal is added to a solution of magnesium chloride.
calcium chloride
Predict what happens when nickel is added to a solution of potassium chloride.
no reaction occurs
Which of the following would not be studied in the branch of chemistry called stoichiometry?
the amount of energy required to break the ionic bonds in calcium fluoride
A balanced chemical equation allows one to determine the
mole ration of any two substances in the reaction
Each reaction stoichiometry problem requires using a
chart of electron configuration
In the reaction represented by the equation C + 2H2 ® CH4, what is the mole ratio of hydrogen to methane?
2:1
In the reaction represented by the equation N2 + 3H2 ® 2NH3, what is the mole ratio of hydrogen to ammonia?
3:2
The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) ® 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
3.0 mol
For the reaction represented by the equation 2H2 + O2® 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?
12 mol
For the reaction represented by the equation 2H2 + O2 ® 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
108 g
For the reaction represented by the equation SO3 + H2O ® H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?
320 g
For the reaction represented by the equation 2HNO3 + Mg(OH)2 ® Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?
593 g
For the reaction represented by the equation Cl2 + 2KBr ® 2KCl + Br2, how many grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide?
188 g
To determine the limiting reactant in a chemical reaction, one must know the
available amount of each reactant
To determine the limiting reactant in a chemical reaction involving known masses of A and B, one could first calculate
the number of moles of B and the number of moles of A available.
What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?
percentage yield
What is the measured amount of a product obtained from a chemical reaction?
actual yield
What is the maximum possible amount of product obtained in a chemical reaction?
theoretical yield
A chemist interested in the efficiency of a chemical reaction would calculate the
percentage yield
If the percentage yield is equal to 100%, then
the actual yield is equal to the theoretical yield.
For the reaction represented by the equation CH4 + 2O2 ® 2H2O + CO2, calculate the percentage yield of carbon dioxide if Laura Buckley and Andrea Case react 1000. g of methane with excess oxygen and find that they have produced 2300. g of carbon dioxide.
83.88%
According to the kinetic-molecular theory, gases condense into liquids because of
forces between molecules
The kinetic-molecular theory explains the behavior of
solids, liquids, and gases.
Unlike in an ideal gas, in a real gas
the particles exert attractive forces on each other.
According to the kinetic-molecular theory, particles of an ideal gas
neither attract nor repel each other but collide
What determines the average kinetic energy of the molecules of any gas?
temperature
Which is an example of effusion?
air slowly escaping from a pinhole in a tire
What happens to the volume of a gas during compression?
the volume decreases


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