Chemistry Final Exam
In an equation, the symbol for a substance in water solution is followed by
(Aq)
Which of the following is the functional group in alcohols?
-OH
The measurement 0.035550 g rounded off to two sig figs would be
0.036
Which of the measurements has been expressed to three significant figures?
0.202 g
For the reaction by the equation Pb(NO3)2 + 2KI2 + 2KNO3 , how many moles of lead(II) iodide are produced from 300 g of potassium iodide and an excess of Pb(NO3)2?
0.904 mol
Which coefficients correctly balance the formula equation CaCo,(s)- Cao(s)+ CO(g)?
1,1,1
Which coefficients correctly balance the formula equation CaO + H2O = Ca(OH)2?
1,1,1
How many molecules are in 2.10 mol CO2?
1.26 x 10^24
How many moles of glucose, C6H12O6, can be "burned" biologically when 10.0 mol of oxygen is available?
1.67 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 2H2O + 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 2Na + 2H20 = 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?
120 g
What is the percentage composition of CF4?
13.6% C, 86.4% F
A sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. The density of gold is
19.3 g/cm
In the reaction represented by the equation N2 +3H 2NHs, what is the mole ratio of nutrogen to ammonia?
1:2
What is the electron configuration for nitrogen, atomic number 7?
1s2 2s2 2p3
The electron notation for aluminum (atomic number 13) is
1s2 2s2 2p6 3s2 3p
Which of the following electron configurations belongs to an element that is NOT chemically reactice?
1s2 2s2 2p6 3s2 3p6
Which coefficients correctly balance the formula NH4NO2 -> N2 + H2O?
2,2,2
How many atoms are in 3.5 moles of arsenic atoms?
2.1 x 10^24 atoms
What is the mass of silver in 3.4 g AgNO3?
2.2 grams
For the reaction represented by the equation C + 2H2 ---> CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?
20 mol
Methane (CH4) contains 75% carbon. What percentage of methane is hydrogen?
25%
What is the balanced equatiok when aluminum reacts with copper (II) sulfate?
2AL + 3CuSO4 = AL2(SO4)3 + 3Cu
Which equation is NOT balanced?
2h2 + O2 = H2O
The electron configuration of nitrigen js 1s^2 2s^2 2p^3. How mang more electrons does nitrogen need to satisfy the octet rule?
3
The number of significant figures in the meaurement 0.000 305 kg is
3
The Haber process for producing ammonia commercially is represented by the equation N68)+3H(g)> 2NH (2). To completely convert 9.0 mol hydrogen gas to ammonia gas, how moles of nitrogen gas required?
3.0 mol
How many moles of silver atoms are in 1.8 x 10^20 atoms of silver?
3.0 x 10^-4
You calculate that 319 000 000 m is the answer to a problem. You are asked to write your answer in scientific notation. Which answer is correct?
3.19 x 10^8
Which of these measurements has been expressed to four significant figures?
30.00 mm
What is the molar mass of AuCl3?
303.6 g
The mass of 2.0 mol of oxygen atoms (atomic mass 16.00 anu) is
32 g
In the reaction reperesented by the equation N2 + 3H2 = 2NH3, what s the mole ratio of hydrogen to ammonia?
3:2
How many atoms of flourine are present in a molecule of carbon tetrafluoride, CF4?
4
How many outermost electrons does a carbon have?
4
What is the number of moles of beryllium atoms in 36 g of Be?
4.0 mol
The density of aluminum is 2.70 g/e. What is the mass of a solid piece of aluminum with a volume of 1.50 cm^3?
4.05 g
In the equation 2KClO3 → 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely?
4.5 mol
How many atoms are in 0.075 mol of titanium?
4.5 x 10^22
One mole of silicon (Si) has a mass of 28.086 g, and one mole of carbon has a mass of 12.011 g. What is the mass of one mole of silicon carbide (SiC)?
40.097 g
What is the percentage composition of CuCl2?
47.267% Cu, 52.733% Cl
In the reaction represented by the equation 2A120-4Al+302, what is the aluminum to oxygen?
4:3
The number of orbitals for the d sublevel is
5
What is the density of 37.72 g of material whose volume is 6.80 cm3?
5.55 g/cm
The percentage of sulfur in SO2 is about 50%. What is the percentage of oxygen in this compound?
50%
For the reaction represented by the equation 2Fe = O2 = 2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen?
575 g
The atomic sublevel with the next highest energy after 4p is
5s
How many carbons are in a molecule of hexane?
6
The electron configuration for the carbon atom (C) is 1s^2 2s^2 2p^2. The atomic number of carbon is
6
The number of atoms in 1 mol of carbon is
6.022 x 10^23
For the reaction by the equation CH4 + 2O2 = CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100 g of methane?
6.23 mol
Using a periodic table, what is the average atomic mass of zinc?
65.39 amu
The mass of 5.000 mol of cesium (atomic mass 132.9 amu) is
664.5 g
What is the mass in grams of 5.90 mol C8H18?
673 g
kg is . For the reaction represented equation AgNO, + NacI- NaNO, + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO?
7.0 mol
When the equation FE3O4 + AL = Al2O3 is correctly balanced, what is the coefficient of Fe?
9
If 1 inch equals 2.54 cm, how many centimeters equal 1 yard?
91.4 cm
What is the molar mass of (NH4)2 CO3?
96 g
A chemical change occurs when
A leaf changes color in the fall
A compound is
A substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances
A measurement that closely agrees with an accepted value is the best described as
Accurate
What is the formula for aluminum sulfate?
Al2(SO4)3
d. ions In the equation 2Al(s) +3Fe(NOa)3Fe(s)+2AINO,)(aq), iron has been replaced by
Aluminum
A solution in which the solvent is water
Aqueous solution
All atoms of the same element have the same
Atomic number
What is the formula for barium hydroxide?
Ba(OH)2
Which instrument measures atompipheric pressure?
Barometer
The molecular formula for vitamin C is C6H8O6. What is the empirical formula?
C3H4O3
What is the formula of calcium phosphate, which is made up of ions Ca2+ and PO 4-3?
Ca3(PO4)2
What is the formula for the compound formed by calcium ions and chloride ions?
CaCl2
What do all organic compounds contain?
Carbon
A statement that uses chemical formulas to show the identities and amounts of the substances chemical reaction
Chemical equation
The process by which the atoms of one or more substances are rearranged to form different substances
Chemical reaction
A number written in front of a chemical formula
Coefficient
To balance a chemical equation, it may be necessary to adjust the
Coefficients
A reaction in which oxygen combines with a substance and releases heat and light energy
Combustion reaction
An equation that shows all of the particles solution as they actually exist
Complete ionic equation
What is the metallic ion in the compound CuCl2?
Cu2+
A reaction in which a compound breaks down into two or more elements or new compounds
Decomposition reaction
The reaction represented by the equation 2HgO = 2Hg + O2 is an
Decomposition reaction
In what kind of reaction does one element replace a similar element in a compund?
Displaement reaction
The density of an object is calculated by
Dividing its mass by volume
The reaction represented by the equation Pb(NOs)h(aą) + 2KI(aą)- Pblz(s)+2KNO,(aq) is
Double-displacemy reaction
A reaction involving the exchange of positive ions between two compounds dissolved in water
Double-replacement reaction
Percent yield of a product is a measure of a reaction's
Efficiency
What are shaped in a covalent bond?
Electrons
A mole of potassium chloride (KCL) contains 6.02 x 10^23
Formula units KCL
A physical change occurs when a
Glue gun melts a glue stick
The indium(II) ion and indium (III) ion
Have charges of 2+ and 3+
Name the compund Fe(NO3)2
Iron(II) nitrate
. You calculate that 213 000 m/s is the answer to problem. What can you conclude about your answer?
It has three significant figures
Matter includes all of the following except
Light
Which reactant controls the amount of product formed in a chemical reaction?
Limiting Reaction
Which of the following is NOT a chemical change?
Melting
Which of the following is a characteristic common to the transition metals?
Most are conductors of electricity and heat.
What is the formula for dinitrogen trioxide?
N2O3
An equation that includes only the particles that participate in the reaction
Net ionic equation
The branch of chemistry that focuses on carbon-containing chemicals is called
Organic chemistry
What is the formula for diphosphorus pentoxide?
P2O5
What is the formula for the compund formed by lead(II) ions and chromate ions?
PbCrO4
A solid produced during a chemical reaction in a solution
Precipitate
A substance formed during a chemical reaction
Product
When the limiting reactant in a chemical completely used, the
Reaction stops
A numerical result is said to have good precision if
Repeated measurments agree closely
Which of the following observations is qualitative?
Salt crystals formed as a liquid evaporated.
In the formation of a covalent bond, electrons are
Shared
The element with electron configuration 1s2 2s2 2p6 3s2 3p2 is
Si (Z=14)
The equation A + BX = AX+B is the general equation for a
Single-displacement
The reaction represented by the equation Mg + 2HCL = H2 + MgCl2 is a
Single-displacement reacyion
A reaction in which the atoms of one element replace the atoms of another element in a compound
Single-replacemt reaction
Substance dissolved in a soulution
Solute
The most plentiful substance in a solution
Solvent
A reaction in which two or more substances react to produce a single product
Synthesis reaction
The equation A + X = AX is the general equation for a
Synthesis reaction
The reaction represented by the equation 2Mg ( s ) + O2 ( g ) - > 2Mg0 ( s ) is a
Synthesis reaction
In a chemical reaction
The mass of the reactants equals the mass of the products
The mole ratio of the elements in a compound's molecular formula is
The same as the mole ratio of the elements in its empirical formula
An atom is
The smallest unit of matter that maintains its chemical identity
Which of the following is NOT matter?
Ultraviolet radiation
The unit m^3 measures
Volume
A molecular compound has the empirical formula XY3. Which of the following is a possible molecular formula?
X2Y6
Name the compound Zn3(PO4)2
Zinc phosphate
What is the small whole number that appears in front of a formula in a chemical equation?
a coefficient
What is the measured amount of a product obtained from a chemical reaction?
actual yield
Mole ratios for a reaction are obtained from the
balanced chemical equations
According to VSEPR theory, the molecular shape of H2O is classified as
bent
According to VSPER theory,which of the following shapes is possible for a molecule with the molecular formula of AB2?
bent and linear
Which of the following is NOT a physical change?
burning
Name the compound CF4.
carbon tetrflouride
In what kind of reaction does a single compound produce two or more simpler substances?
decomposition reaction
The reaction represented by the equation 2KCLO3 =2KCL +3O2 is a
decomposition reaction
Name the compound N2O3
dinitrogen trioxide
The equation AX + BY = AY + BX is the general equation for a
double-displacement reaction.
Most of the volume of an atom is occupied from the
electrons
Which of the following number of atoms can form a tetrahedral molecule?
five
Which of the metric units are used to measure mass?
g
As the atomic number increases, the number of electrons in a neutral atom
increase
An anion
is an ion with a negative charge
What determines that an element is a metal?
its position in the periodic table
According to VSEPR theory, the molecular shape of CO2 is classified as
linear
If electromagnetic radiation A has a lower frequency than electromagnetic radiation B, then compared to B, the wavelength of A is
longer
Name the compound Ni(ClO3)2
nickel(II) chlorate
Which of the following elements normally exists in the form of diatomic molecules?
nitrogen
If tow convalently bonded atoms are identical, the bond is
nonpolar covalent
What is the name of the alkane having five carbons?
pentane
Name the compound KClO3
potassium chlorate
starting substance in a chemical reaction
reactant
Name the compound SiO2
silicon dioxide
Limiting a reactant is often accomplished by
slowing down a chemical reaction
Name the compound SO3
sulfur trioxide
Pressure is the force per unit
surface area
An atom is electrically neutral because
the numbers of protons and neutrons are equal
Elements in the same group have similar chemical properties because
they have the same number of valence electrons
Where does a subscript that indicates the number of atoms appear, relative to a chemical symbol in a formula?
to the lower right
