Chemistry quizes
What is the oxidation number of Cr in a dichromate anion?
+6
What is the maximum number of electrons in an atom that can have the following set of quantum numbers? n = 4 /= 3 m/ = -2 ms = +1/2
1
The correct electron-dot structure for HCN shows:
1 triple bond between C and N, 1 C-H bond and 1 lone pair of electrons on the N atom
Iridium is essentially tied with osmium for the distinction of being called the "densest element" with a density of 22.5 g/cm^3. What would be the mass in pounds of a 1.0 ft x 1.0 ft x 1.0 ft cube of iridium? (1 lb = 453.6 g)
1.4 x 10^3 lb
A 9.50 % by mass solution of acetone (C3H6O) in water has a density of 0.9849 g/mL at 20°C. What is the molarity of this solution?
1.61 M
If a car has an EPA mileage rating of 30 miles per gallon, what is this rating in kilometers per liter? (1 L = 1.06 qt)
13 km/L
A phosphide ion has:
15 protons and 18 electrons
What is the molar mass of acetaminophen, C8H9NO2?
151 g/mol
A piece of metal with a mass of 611 g is placed into a graduated cylinder that contains 25.1 mL of water, raising the water level to 56.7 mL. What is the density of the metal?
19.3 g/cm^3
An iron(II) ion has:
24 electrons and a charge of 2+
When 7.02oC is converted to the Fahrenheit scale, how many significant figures are there in the °F result?
3
How many polar bonds does CCl4 have in its structure
4
A possible set of quantum numbers for the last electron added to complete an atom of gallium (Ga) in its ground state is N, /, M/, Ms
4, 1, -1, +1/2
Determine the mass percent HCl in a 1.2 M solution of hydrochloric acid with a density of 1.019 g/mL?
4.3 %
Radio waves travel at the speed of light, which is 3.00 x 10^8 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 x 10^8 km from Earth?
44 min
How many 3d electrons does an Fe3+ ion have?
5
How many electrons are there in the 2nd principal energy level (n = 2) of a phosphorus atom?
8
The number of lone electron pairs in the CO32- ion is ___.
8
The total number of bonding electrons in a molecule of formaldehyde (H2CO) is
8
An oxide ion, O^2-, has:
8 protons and 10 electrons
A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL. What is the ammonium nitrate concentration in the resulting solution?
8.72 x 10^-2 M
Write the net ionic equation for a reaction between a strong acid and strong base
H+(aq) + OH-(aq) à H2O(l)
Identify the major ionic species present in an aqueous solution of H2SO4.
H+, HSO4-
Which of the following is the formula for hydrobromic acid?
HBr
Washing soda is a hydrate of sodium carbonate. Elemental analysis of a sample of washing soda gave 4.20% C and 7.05% H. What is the formula for washing soda?
Na2CO3.10H2O
The formula for sodium sulfide is
Na2S
What is the chemical formula of the salt produced by the complete neutralization of sodium hydroxide with sulfuric acid?
Na2SO4
Which of the following pairs of elements would be most likely to form an ionic compound?
O and Zn
The Lewis dot symbol for the a lead atom is
P
Which one of the following compounds does not follow the octet rule?
PF5
Which of the following is the correct net ionic equation for the reaction that occurs when solutions of Pb(NO3)2 and NH4Cl are mixed?
Pb2+(aq) + 2Cl-(aq) → PbCl2(s)
Which element has the following ground-state electron configuration? [Kr]5s^2 4d^10 5p^2
Sn
Which one of the following does not have [Xe] as its electronic configuration?
Sn4+
All of the following are properties of tin. Which one is a chemical property of tin?
Tin erodes when added to hydrochloric acid, and a clear gas forms.
The electron configuration of a ground-state copper atom is
[Ar]4s^1 3d^10.
Which of the following is the ground-state electron configuration of a calcium atom?
[Ar]4s^2
The electron configuration of a ground-state vanadium atom is
[Ar]4s^2 3d^3.
An anion is defined as
a charged atom or group of atoms with a net negative charge.
The electron dot formula for O2 shows
a double covalent bond.
The elements in a column of the periodic table are known as
a group.
The correct name for NH4NO3 is
ammonium nitrate
The correct name for Ba(OH)2 is
barium hydroxide
Name the binary compound formed between barium and phosphorus.
barium phosphide
Which one of the following elements is most likely to form a 2+ ion?
beryllium
Which one of the following represents a chemical change?
burning a piece of coal
Which of the following elements is chemically similar to magnesium?
calcium
Which of the following elements is chemically similar to potassium?
cesium
The chemical name for ClO3- is chlorate ion. Therefore, the name of HClO3 is
chloric acid.
The Stock system name for CrO3 is:
chromium(VI) oxide
The Stock system name for Co2(SO3)3 is:
cobalt(III) sulfite
The correct name for CuSO4·5H2O is
copper(II) sulfate pentahydrate
Transition metal elements have atoms or ions with partially filled
d subshells.
In a cathode ray tube
electrons pass from the cathode to the anode.
Lanthanide (or rare earth elements) have atoms or ions with partially filled
f subshells.
When J. J. Thomson discovered the electron, what physical property of the electron did he measure?
its charge-to-mass ratio, e/m
Which of the following is an example of a physical property?
lead becomes a liquid when heated to 601°C
The Stock system name for Mn2O7 is
manganese(VII) oxide
The correct name for KHCO3 is
potassium hydrogen carbonate
Rutherford's experiment with alpha particle scattering by gold foil established that
protons are not evenly distributed throughout an atom.
In what row and group of the periodic table would you find the element with the electron configuration [Kr]5s^2 4d^10 5p^2?
row 5, group 4A
Which one of the following elements is most likely to form a 2- ion?
selenium
Which of the following elements behaves chemically similarly to potassium?
sodium
The electron dot structure for AsCl3 shows
three single bonds and 10 lone pairs.
Which one of the following represents a physical change?
water, when heated to 100°C, forms steam
If the price of gasoline is $2.99 per U.S. gallon, what is the cost per liter? (1 L = 1.06 qt)
$0.79/L
Which two of the following electron configurations represent elements that would have similar chemical properties? (1) 1s22s22p4 (2) 1s22s22p5 (3) [Ar]4s23d5 (4) [Ar]4s23d104p5
(2) and (4)
Which of the following is a redox reaction?
****Zn(s) + 2 HCl(aq) à ZnCl2(aq) + H2(g) -None of the above - ZnSO4(aq) + Hg2(NO3)2(aq) à Hg2SO4(s) + Zn(NO3)2(aq) - HNO3(aq) + KOH(aq) à KNO3(aq) + H2O(l
What is the oxidation number of hydrogen in H2O2?
+1
If it takes 54 mL of 0.1M NaOH to neutralize 125 mL of an HCl solution, what is the concentration of the HCl? NaOH + HCl---> NaCl + H2O
0.043 M
34.62 mL of 0.1510 M NaOH was needed to neutralize 50.0 mL of an H2SO4 solution. What is the concentration of the original sulfuric acid solution?
0.0532
Iron has a density of 7.87 g/cm^3. What mass of iron would be required to cover a football playing surface of 120 yds ´ 60 yds to a depth of 1.0 mm? (1 inch = 2.54 cm; 1 lb = 453.6 g)
1.0 x 10^5 lb
The "escape velocity" from Earth (the speed required to escape Earth's gravity) is 2.5 x 10^4 miles per hour. What is this speed in m/s? (1 mile = 1609 m)
1.1 x 10^4 m/s
How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution? HCl + NaOH---> NaCl + H2O
1.25 x 10^-2 moles
What is the volume, in cubic centimeters, of a brick that is 4.0 in x 2.7 in x 8.0 in?
1.4 x 10^3 cm^3
How many grams of sulfur are there in 6.0 g of Fe2(SO4)3?
1.44 g
In 1828, the diameter of the U.S. dime was changed to approximately 18 mm. What is this diameter when expressed in micrometers?
1.8 x 10^4 μm
Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 → 4NO + 6H2O What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?
1.87 mol
The total number of lone pairs in NCl3 is
10
The recommended daily allowance (RDA) of calcium is 1.2 g. Calcium carbonate contains 12.0% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium?
10 g
The SI prefixes kilo and centi represent, respectively:
10^3 and 10^- 2.
The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm^3. Farther down is the core. If the average density of the Earth is 5.5 g/cm^3, what is the average density of the Earth's core? (Recall that the volume of a sphere is given by V = (4/3)pr^3.)
11 g/cm^3
The density of mercury is 13.6 g/cm^3. What is the mass in pounds of 1.0 gallons of mercury? (1 lb = 453.6 g; 1 gal = 3.785 L)
110 lb
An aluminum ion, Al^3+, has:
13 protons and 10 electrons
Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water. The density of water is 0.997 g/mL.
13.3 %
What is the mass of 3.00 moles of ethanol, C2H6O?
138 g
Calculate the mass of FeS formed when 9.42 g of iron reacts with 8.50 g of sulfur according to the following reaction. Fe(s) + S(s) → FeS(s)
14.8 g
How many neutrons are there in an atom of uranium whose mass number is 235?
143
A barrel of oil contains 42.0 gallons. How many liters is this? (1L = 1.06 qt)
158 L
An atom of the isotope chlorine-37 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)
17 p, 20 n, 17 e
A block of iron has a mass of 826 g. What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25°C are provided: magnesium, 1.7 g/cm3 ; graphite, 1.8 g/cm3 ; iron, 7.9 g/cm3.
180 g
How many unpaired electrons does a ground-state atom of sulfur have?
2
The number of lone electron pairs in the N2 molecule is ___.
2
Which of the following samples contains the greatest number of atoms?
2.0 mole of Ar
Which of the following represents the largest mass?
2.0 x 10^2 cg
Do the indicated arithmetic and give the answer to the correct number of significant figures. (1.5 x 10^-4 x 61.3) + 2.01 =
2.02
What mass of K2CO3 is needed to prepare 200. mL of a solution having a concentration of 0.075 M?
2.07 g
Suppose a house has a floor area of 2,250 square feet. What is this area in units of square centimeters?
2.09 x 10^6 cm^2
How many silicon atoms are there in 1.00 g of silicon?
2.14 x 10^22 atoms
The density of lead is 11.4 g/cm3 at 25°C. Calculate the volume occupied by 25.0 g of lead
2.19 cm^3
A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm^3)
2.27 m
If 0.274 moles of a substance weighs 62.5 g, what is the molar mass of the substance, in units of g/mol?
2.28 x 10^2 g/mol
24 km is how many millimeters?
2.4 x 10^7 mm
How many sulfur atoms are there in 21.0 g of Al2S3?
2.53 x 10^23 atoms
How many square kilometers are equivalent to 28.5 cm2?
2.85 x 10^-9 km^2
An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?
250 g Ne
Which of the following represents a hydrogen displacement reaction?
2Al(s) + 3H2SO4(aq) ® Al2(SO4)3(aq) + 3H2(g)
Which of the following represents a combustion reaction?
2C2H6(g) + 7O2(g) ® 4CO2(g) + 6H2O(l)
Which of the following is an example of a decomposition reaction?
2H2O2(aq) ® 2H2O(l) + O2(g)
Identify the major ionic species present in an aqueous solution of K2SO4.
2K+, SO42-
Which of the following represents a halogen displacement reaction?
2KBr(aq) + Cl2(g) ® 2KCl(aq) + Br2(l)
How many non-polar bonds does CH3OH contain?
3
The number 1.50 x 10^9 has how many significant figures?
3
The number of resonance structures for the nitrate ion that satisfy the octet rule is
3
What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca3(PO4)2 + ___ H2SO4 → ___ CaSO4 + ___ H3PO4
3
When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is __ C2H4 + __ O2 → __ CO2 + __ H2O
3
Express the number 0.0000035 in scientific notation.
3.5 x 10^-6
Determine the number of moles of aluminum in 96.7 g of Al.
3.58 mol
How many grams of Cr can be produced by the reaction of 44.1 g of Cr2O3 with 35.0 g of Al according to the following chemical reaction? 2Al + Cr2O3 → Al2O3 + 2Cr
30.2 g
What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al2O3 + 3C → 2Al + 3CO
31.8 g
If 23.6 g of hydrogen gas reacts with 28.3 g of nitrogen gas, what is the maximum amount of product that can be produced?
34.4 g
Calculate the mass of 3.00 moles of CF2Cl2.
363 g
An element with the general electron configuration for its outermost electrons of ns2np1 would be in which element group?
3A
How many electrons are in the 4p orbitals of selenium?
4
How many significant figures are there in 0.03070 g?
4
How many significant figures does the result of the following operation contain? 8.52010 x 7.927
4
A possible set of quantum numbers for the last electron added to complete an atom of germanium (Ge) in its ground state is n l ml ms
4, 1, 0, +1/2
A particular flask has a mass of 17.4916 g when empty. When filled with ordinary water at 20.0°C (density = 0.9982 g/mL), the mass of the flask is now 43.9616 g. The density of so-called "heavy water" at 20.0°C is 1.1053 g/mL. What will the mass of the flask be when filled with heavy water at 20.0°C?
46.8016 g
A ground-state atom of manganese has ___ unpaired electrons
5
How many electrons are there in the 3rd principal energy level (n = 3) of a phosphorus atom?
5
How many significant figures does the result of the following sum contain? 8.5201 + 1.934
5
The number of orbitals in a d subshell is
5
How many milliliters is 0.05 L?
50 mL
The highest temperature ever recorded in Death Valley, CA, was 134°F. Express this temperature in °C.
56.7°C
The number of lone electron pairs in the NO2- ion is ___.
6
Express the number 627 in scientific notation.
6.27 x 10^2
The mass of 1.21 x 10^20 atoms of sulfur is
6.44 mg.
How many cubic inches are in 1.00 liter?
61.0 in^3
What is the percent yield of a reaction if the product recovered is 89.4 g and the theoretical yield is 128.4 g?
69.6 %
How many orbitals are allowed in a subshell if the angular momentum quantum number for electrons in that subshell is 3?
7
Calculate the molality of 6.0 M H2SO4 solution. The density of the solution is 1.34 g/mL.
7.98 m
Calculate the mass of excess reagent remaining at the end of the reaction in which 90.0 g of SO2 are mixed with 100.0 g of O2. 2SO2 + O2 → 2SO3
77.5 g
Zinc melts at 419°C. What temperature is this in oF?
786°F
Which one of the following chemical reactions is balanced?
8HCl + 2KMnO4 → 3Cl2 + 2MnO2 + 4H2O + 2KCl
Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is __ SF4 + __ H2O → __ H2SO3 + __ HF
9
How many grams of water could be made from 5.0 mol H2 and 3.0 mol O2? H2 + O2---> H2O
90 g
Liquid oxygen boils at -183°C. Express the boiling point of liquid oxygen in Kelvin.
90.2 K
How many protons are there in an atom of uranium whose mass number is 235?
92
Based on the solubility rules, which one of the following should be soluble in water?
AgNO3
Which one of the following is not isoelectronic with Kr?
As3+
Which one of the following molecules has an atom with an incomplete octet?
BF3
Predict the formula for the binary compound formed between barium and phosphorus.
Ba3P2
Based on the solubility rules, which one of the following compounds should be insoluble in water?
BaSO4
Based on the solubility rules, which of the following will occur if solutions of CuSO4(aq) and BaCl2(aq) are mixed?
BaSO4 will precipitate; Cu2+ and Cl- are spectator ions.
The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound?
C18H36O2
Which of the following compounds is a nonelectrolyte?
C2H6O (ethanol)
What is the chemical formula of the salt produced by the neutralization of nitric acid with calcium hydroxide?
Ca(NO3)2
What is the formula for the ionic compound formed by calcium ions and nitrate ions?
Ca(NO3)2
The formula for calcium phosphate is
Ca3(PO4)2
Which of the following represents a precipitation reaction?
CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g)
Which one of the following is most likely to be an ionic compound?
CaCl2
What is the formula for the ionic compound formed by calcium and selenium?
CaSe
Give the formula for cobalt(II) chlorate dihydrate:
Co(ClO3)2·2H2O
Predict the products of the following single replacement reaction. Fe(s) + CuSO4(aq) ®
Cu(s) + FeSO4(aq)
Which is the correct formula for copper(II) phosphate?
Cu3(PO4)2
Which of the following elements is most likely to be a good conductor of electricity?
Fe
The chemical formula for iron(II) nitrate is
Fe(NO3)2
Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g) According to the above reaction, which is the limiting reagent when 28 g of MnO2 are reacted with 42 g of HCl?
HCl
Atoms of the same element with different mass numbers are called
Isotopes.
Which one of the following pairs are isoelectronic (same number of electrons)?
K+ and Cl-
What is the formula for the binary compound formed by potassium and nitrogen?
K3N
Which of the following compounds is a strong electrolyte?
KOH
Identify the major ions present in an aqueous LiOH solution.
Li+, OH-
Which element has the following ground-state electron configuration? 1s^2 2s^2 2p^6 3s^2
Mg
What is the chemical formula of the salt produced by the neutralization of hydrobromic acid with magnesium hydroxide?
MgBr2
Which element has the following ground-state electron configuration? [Kr]5s^1 4d^5
Mo
Which of the following Lewis structures is incorrect?
N=N
Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 → 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?
NH3
Which of the following compounds is a weak electrolyte?
NH3
Which one of the following is most likely to be a covalent compound?
SF4
Which element has the following ground-state electron configuration? [Kr]5s24d105p3
Sb
A tentative explanation for a set of observations that can be tested by further experimentation is referred to as
a hypothesis
Consider the element with the electron configuration [Xe]6s24f7. This element is
a lanthanide element.
A unifying principle that explains a body of facts and relations is referred to as
a theory
Consider the element with the electron configuration [Kr]5s24d7. This element is
a transition metal.
The general electron configuration for atoms of all elements in Group 5A is
ns2np3
Given that the ion ClO3- is named chlorate, what is the ion ClO4- named?
perchlorate
Which of the following elements behaves chemically similarly to oxygen?
sulfur
Which of the following elements is chemically similar to oxygen?
sulfur