CHMY 171 Exam 1

Which of the following cannot be separated into a simpler substance by chemical means? A) Element D) Homogeneous mixture B) Emulsion E) Heterogeneous mixture C)Compound

A) Element

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula? A) I2O5 B) IO5 C) 2IO5 D) I5O2 E) (IO5)2

A) I2O5

Which one of these represents a physical change? A) Water, when heated, forms steam B) Bleach turns hair yellow C) Sugar, when heated, becomes brown D) Milk turns sour E) Apples, when exposed to air, turn brown

A) Water, when heated, forms steam

Which field of study made a big contribution toward understanding the composition of the atom? A) Electricity D) Electrochemistry B) Radiation E) Quantum Mechanics C)Solution Chemistry

B) Radiation

The scientist who determined the magnitude of the electric charge of the electron was A) John Dalton D) Henry Moseley B) Robert Millikan E) J. Burdge C)J. J. Thomson

B) Robert Millikan

Tetrasulfur dinitride decomposes explosively when heated. What is its formula? A) S2N4 B) S4N2 C) 4SN2 D) S4N E) S2N

B) S4N2

Which one of these represents a chemical change? A) Boiling water to form steam B) Turning hair yellow with bleach C) Melting butter D) Mixing powdered charcoal and oxygen at room temperature E) Cutting a bar of sodium metal into pieces with a knife

B) Turning hair yellow with bleach

Which of the following is a type of radioactive radiation that consists of electrons and is deflected away from the negatively charged plate? A) a rays B) b rays C) g rays D) d rays E) e rays

B) b rays

Which of the following is a non-metal? A) lithium, Li, Z = 3 D) bismuth, Bi, Z = 83 B) bromine, Br, Z = 35 E) sodium, Na, Z = 11 C)mercury, Hg, Z = 80

B) bromine, Br, Z = 35

Which of these elements is chemically similar to magnesium (in the same group)? A) sulfur B) calcium C) iron D) nickel E) potassium

B) calcium

Which of the following elements are the least reactive? A) alkali metals D) alkaline earth metals B) noble gases E) metalloids C)halogens

B) noble gases

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch? (1in = 2.54 cm; 1 lb = 454 g) A) 849 lb/in3 D) 0.491 lb/in3 B) 491 lb/in3 E) 1.83 ´ 10-3 lb/in3 C)376 lb/in3

D) 0.491 lb/in3

A patient in the hospital is running a temperature of 39.5°C; what is this in Fahrenheit? A) 99°F B) 101.3°F C) 102.4°F D) 103.1°F E) 104°F

D) 103.1°F

The S.I. prefix mega- (M) means A) 10-6 B) 10-3 C) 103 D) 106 E) 109

D) 106

Which of these quantities represents the largest mass? A) 2.0 ´ 102 mg D) 2.0 ´ 102 cg B) 0.0010 kg E) 10.0 dg C)1.0 ´ 105mg

D) 2.0 ´ 102 cg

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon. Isotope Isotopic Mass (amu) Abundance % 28Si 27.976927 92.23 29Si 28.976495 4.67 30Si 29.973770 3.10 A) 29.2252 amu D) 28.0855 amu B) 28.9757 amu E) 27.9801 amu C)28.7260 amu

D) 28.0855 amu

If normal body temperature is 98.6°F, what is this in Celsius? A) 34°C B) 35.5°C C) 36.4°C D) 37°C E) 38.7°C

D) 37°C

How many significant figures does the sum 8.5201 + 1.93 contain? A) 1 B) 2 C) 3 D) 4 E) 5

D) 4

Radio waves travel at the speed of light, which is 3.00 ´ 108 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 ´ 108 km from Earth? A) 4.4 ´ 10 -2 min D) 44 min B) 1.6 ´ 105 min E) 2.6 min C)4.0 ´ 1015 min

D) 44 min

Which one of the following statements about atoms and subatomic particles is correct? A) Rutherford discovered the atomic nucleus by bombarding gold foil with electrons. B) The proton and the neutron have identical masses. C) The neutron's mass is equal to that of a proton plus an electron. D) A neutral atom contains equal numbers of protons and electrons. E) An atomic nucleus contains equal numbers of protons and neutrons.

D) A neutral atom contains equal numbers of protons and electrons.

What term is used to represent the number of protons in the nucleus of each atom of an element and is equal to the number of electrons outside the nucleus? A) Isotope number D) Atomic number B) Mass number E) Atomic mass units C)Mass-to-charge ratio

D) Atomic number

Which of the following is a molecular formula for CH? A) C2H6 B) C3H9 C) C4H10 D) C6H6 E) None of the answers are correct.

D) C6H6

Which of the following is not an S.I. base unit? A) Meter B) Ampere C) Second D) Gram E) Kelvin

D) Gram

Which of the following does not have a uniform composition throughout? A) Element D) Heterogeneous mixture B) Compound E) Solvent C)Homogeneous mixture

D) Heterogeneous mixture

What name is given to a class of compounds that generally do not contain carbon? A) Acarbonic compounds D) Inorganic compounds B) Carbonic compounds E) Aldehyde compounds C)Organic compounds

D) Inorganic compounds

What name is given to the concept that different samples of a given compound always contain the same elements in the same mass ratio? A) Ration Law D) Law of Definite Proportions B) Law of Equality E) 2nd Law of thermodynamics C)1st Law of Thermodynamics

D) Law of Definite Proportions

Who is credited with first measuring the charge of the electron? A) Dalton B) Gay-Lussac C) Thomson D) Millikan E) Rutherford

D) Millikan

What represents the exact number of atoms of each element in a molecule? A) Chemical formula D) Molecular formula B) Compound E) Atomic formula C)Constitutional formula

D) Molecular formula

Which of these pairs of elements would be most likely to form an ionic compound? A) P and Br B) Cu and K C) C and O D) O and Zn E) Al and Rb

D) O and Zn

You prepare 1000. mL of tea and transfer it to a 1.00 quart pitcher for storage. Which of the following statements is true? (1L = 1.06qt) A) The pitcher will be filled to 100% of its capacity with no tea spilled. B) The pitcher will be filled to about 95% of its capacity. C) The pitcher will be filled to about 50% of its capacity. D) The pitcher will be completely filled and a small amount of tea will overflow. E) The pitcher will be completely filled and most of the tea will overflow.

D) The pitcher will be completely filled and a small amount of tea will overflow.

The elements in a column of the periodic table are known as A) metalloids. B) a period. C) noble gases. D) a group. E) nonmetals.

D) a group.

The compound, P4S10, is used in the manufacture of safety matches. What is its name? A) phosphorus sulfide D) tetraphosphorus decasulfide B) phosphoric sulfide E) phosphorus sulfite C)phosphorus decasulfide

D) tetraphosphorus decasulfide

Which of the following is a metal? A) nitrogen, N, Z = 7 D) thallium, Tl, Z = 81 B) phosphorus, P, Z = 15 E) silicon, Si, Z = 14 C)arsenic, Z = 33

D) thallium, Tl, Z = 81

A dip of vanilla ice cream is a pure substance.

False

Boiling point and melting point are extensive properties.

False

Rusting of a piece of iron under environmental conditions is a physical change.

False

The ripening of fruit, once picked, is an example of physical change.

False

When applying the scientific method, it is important to avoid any form of hypothesis.

False

_________, _________, and ________ are the three states of matter.

Gas, Solid, Liquid

A(n) __________ is something that has a definite composition.

Pure substance

Matter is anything that has mass and occupies space.

True

The density of a substance is an intensive property.

True

The result of (3.8621 ´ 1.5630) - 5.98 is properly written as A) 0.06 B) 0.056 C) 0.0565 D) 0.05646 E) 0.056462

A) 0.06

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, 81/35 Br. Select the combination which lists the correct atomic number, neutron number, and mass number, respectively. A) 35, 46, 81 B) 35, 81, 46 C) 81, 46, 35 D) 46, 81, 35 E) 35, 81, 116

A) 35, 46, 81

How many cubic inches are in 1.00 liter? (1in = 2.54cm) A) 61.0 in3 B) 155 in3 C) 394 in3 D) 1.64 ´ 104 in3 E) None of the above

A) 61.0 in3

An oxide ion, O2-, has: A) 8 protons and 10 electrons D) 8 protons and 7 electrons B) 10 protons and 8 electrons E) 10 protons and 7 electrons C)8 protons and 9 electrons

A) 8 protons and 10 electrons

Which one of these species is an ion? A) B3+ B) NaCl C) He D) 14C E) None of the above

A) B3+

What is the formula for the ionic compound formed by calcium and selenium? A) CaSe B) Ca2Se C) CaSe2 D) Ca3Se E) CaSe3

A) CaSe

What is the name of ClO-? A) hypochlorite B) chlorate C) chlorite D) perchlorate E) perchlorite

A) hypochlorite

Rutherford's experiment with alpha particle scattering by gold foil established that A) protons are not evenly distributed throughout an atom. B) electrons have a negative charge. C) electrons have a positive charge. D) atoms are made of protons, neutrons, and electrons. E) protons are 1840 times heavier than electrons.

A) protons are not evenly distributed throughout an atom.

Which of these elements is chemically similar to oxygen(in the same group)? A) sulfur B) calcium C) iron D) nickel E) potassium

A) sulfur

How many neutrons are there in an atom of lead whose mass number is 208? A) 82 B) 126 C) 208 D) 290 E) None of the above

B) 126

An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p+ = proton, n0 = neutron, e- = electron) A) 15 p+, 16 n0, 15 e- D) 32 p+, 31 n0, 32 e- B) 16 p+, 15 n0, 16 e- E) 16 p+, 16 n0, 15 e- C)16 p+, 31 n0, 16 e-

B) 16 p+, 15 n0, 16 e-

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mile = 1609 m) A) 65,500 mi/h D) 1,090 mi/h B) 25,300 mi/h E) 5.02 ´ 10-3 mi/h C)18,200 mi/h

B) 25,300 mi/h

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1mi = 1609m) A) 65,500 mi/h D) 1,090 mi/h B) 25,300 mi/h E) 5.02 ´ 10-3 mi/h C)18,200 mi/h

B) 25,300 mi/h

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in Kelvin? A) 387.6 K B) 355.6 K C) 323.6 K D) 190.8 K E) -190.8 K

B) 355.6 K

How many significant figures are in 0.006570? A) 3 B) 4 C) 5 D) 6 E) 7

B) 4

Iron has a density of 7.87 g/cm3. 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) A) 76 kg B) 47 Mg C) 7.6 ´ 105 g D) 4.7 ´ 108 g E) 1.9 ´ 107 g

B) 47 Mg

How many milliliters is 0.0055 L? A) 0.55 mL B) 5.5 mL C) 0.5 mL D) 0.0000055 mL E) 182 mL

B) 5.5 mL

What is the volume in milliliters of a 32.0 oz can of juice? (1 fl oz = 29.6 mL) A) 1.08 mL B) 947 mL C) 0.925 mL D) 0.95 mL E) 1.1 mL

B) 947 mL

What is the formula for the ionic compound formed by calcium ions and nitrate ions? A) Ca3N2 B) Ca(NO3)2 C) Ca2NO3 D) Ca2NO2 E) CaNO3

B) Ca(NO3)2

Which is the correct formula for copper (II) phosphate? A) Cu2PO4 B) Cu3(PO4)2 C) Cu2PO3 D) Cu(PO4)2 E) Cu(PO3)2

B) Cu3(PO4)2

What is defined as a tentative explanation for observations that are made that result in the formulation of this concept? A) Law B) Hypothesis C) Theory D) Phenomena E) Prediction

B) Hypothesis

What term is used to represent the total number of neutrons and protons in the nucleus of each atom of an element? A) Isotope number D) Atomic number B) Mass number E) Atomic mass units C)Mass-to-charge ratio

B) Mass number

What is the formula for the permanganate ion? A) MnO2- B) MnO4- C) MgO42- D) Mn2O7- E) MgO22-

B) MnO4-

Convert 500. milliliters to quarts. (1L = 1.06 qt) A) 1.88 qt B) 0.472 qt C) 0.528 qt D) 4.72 ´ 105 qt E) 5.28 ´ 105 qt

C) 0.528

What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm3? A) 14.1 cm3 B) 0.0691 cm3 C) 14.5 cm3 D) 141 cm3 E) 691 cm3

C) 14.5 cm3

If the temperature is 38°F, what is the temperature in Kelvin? A) 3.33 K B) 100.4 K C) 276.5 K D) 311.15 K E) 235.15 K

C) 276.5

After carrying out the operations below, how many significant figures are appropriate to show in the result? (13.7 + 0.027) ¸ 8.221 A) 1 B) 2 C) 3 D) 4 E) 5

C) 3

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers. (1mi = 1609m) A) 6.1 ´ 105 km D) 1.5 ´ 105 km B) 5.3 ´ 105 km E) 9.4 ´ 104 km C) 3.9 ´ 105 km

C) 3.9 ´ 105 km

The number 1.050 ´ 109 has how many significant figures? A) 2 B) 3 C) 4 D) 9 E) 13

C) 4

Which of the following is the empirical formula for hexane, C6H14? A) C12H28 B) C6H14 C) C3H7 D) CH2.3 E) C0.43H

C) C3H7

Who discovered the subatomic particle having a neutral charge called neutron? A) Millikan B) Dalton C) Chadwick D) Rutherford E) Thomson

C) Chadwick

Which pair of elements would be most likely to form an ionic compound? A) P and Br B) Zn and K C) F and Al D) C and S E) Al and Rb

C) F and Al

Which of the following is an extensive property? A) Density B) Temperature C) Mass D) Specific Heat E) Pressure

C) Mass

Which is the correct definition of a polyatomic molecule? A) A molecule which contains two or more of the same atoms B) A molecule which contains two or more different atoms C) a and b D) A molecule which contains two identical atoms E) A molecule which contains two different atoms

C) a and b

The S.I. base unit of mass is A) mg B) g C) kg D) metric ton E) lb

C) kg

A magnesium ion, Mg2+, has A) 12 protons and 13 electrons. D) 24 protons and 22 electrons. B) 24 protons and 26 electrons. E) 12 protons and 14 electrons. C)12 protons and 10 electrons.

C)12 protons and 10 electrons.

Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37. A) 37 p+, 37 e-, 17 n0 D) 37 p+, 17 e-, 20 n0 B) 17 p+, 17 e-, 37 n0 E) 17 p+, 37 e-, 17 n0 C)17 p+, 17 e-, 20 n0

C)17 p+, 17 e-, 20 n0

Which of the following is a chemical change? A) Boiling of water D) Condensing water vapor into rainfall B) Melting wax E) Carving a piece of wood C)Broiling a steak on a grill

C)Broiling a steak on a grill

If a liquid contains 60% sugar and 40% water throughout its composition, what is it called? A) Solute D) Heterogeneous mixture B) Compound E) Solvent C)Homogeneous mixture

C)Homogeneous mixture

Two isotopes of an element differ only in their A) symbol. D) number of protons. B) atomic number. E) number of electrons. C)atomic mass.

C)atomic mass.

Which of the following is a metalloid? A) carbon, C, Z = 6 D) iridium, Z = 77 B) sulfur, S, Z = 16 E) bromine, Br, Z = 35 C)germanium, Ge, Z = 32

C)germanium, Ge, Z = 32

A(n) ____________ is a substance composed of atoms of two or more elements chemically united in fixed proportions.

Compound

Given that 1 inch = 2.54 cm, 1 cm3 is equal to A) 16.4 in3 B) 6.45 in3 C) 0.394 in3 D) 0.155 in3 E) 0.0610 in3

E) 0.0610 in3

Which is correct if 0.01234 is rewritten in scientific notation? A) 1.234 ´ 10-3 D) 1.234 ´ 102 B) 12.3 ´ 104 E) 1.234 ´ 10-2 C)1 ´ 10-1

E) 1.234 ´ 10-2

Select the answer that expresses the result of this calculation with the correct number of significant figures. 13.602 x 1.90 x 3.06 = 4.2 x 1.4097 A) 13.3568 B) 13.357 C) 13.36 D) 13.4 E) 13

E) 13

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm = A) 269.01860 cm D) 269.02 cm B) 269.0186 cm E) 269.0 cm C)269.019 cm

E) 269.0 cm

A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters? A) 3.5 ´ 105 cL D) 3.5 ´ 10-4 cL B) 3.5 ´ 104 cL E) 3.5 ´ 10-3 cL C)3.5 cL

E) 3.5 ´ 10-3 cL

How many hertz is 600.11 MHz? A) 6.0011 ´ 10-4 Hz D) 6.0011 ´ 10-2 Hz B) 60.011 Hz E) 6.0011 ´ 108 Hz C)6.0011 ´ 106 Hz

E) 6.0011 ´ 108 Hz

If you have a graduated cylinder, containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95g is dropped into the graduated cylinder then what is the density of this metal? A) 0.0835 g/mL D) 10.0 g/mL B) 0.513 g/mL E) 9.97 x 10-2 g/mL C)0.0718 g/mL

E) 9.97 x 10-2 g/mL

Which is the correct definition of a heteronuclear diatomic molecule? A) A molecule which contains two or more of the same atoms B) A molecule which contains two or more different atoms C) a and b D) A molecule which contains two identical atoms E) A molecule which contains two different atoms

E) A molecule which contains two different atoms

Which, if any, of the following elements do not occur in the major classes of organic compounds? A) H B) C C) N D) O E) All the above elements occur in the major classes of organic compounds.

E) All the above elements occur in the major classes of organic compounds.

Which of these scientists developed the nuclear model of the atom? A) John Dalton D) Henry Moseley B) Robert Millikan E) Ernest Rutherford C)J. J. Thomson

E) Ernest Rutherford

Which of these elements is most likely to be a good conductor of electricity? A) N B) S C) He D) Cl E) Fe

E) Fe

Which of the following activities is not a part of good science? A) Proposing a theory D) Designing experiments B) Developing a hypothesis E) Indulging in speculation C) Making quantitative observations

E) Indulging in speculation

Which of these is an example of a physical property? A) Corrosiveness of sulfuric acid B) Toxicity of cyanide C) Flammability of gasoline D) Neutralization of stomach acid with an antacid E) Lead becomes a liquid when heated to 601°C

E) Lead becomes a liquid when heated to 601°C

Which of the following is an extensive property of oxygen? A) Boiling point D) Density B) Temperature E) Mass C)Average kinetic energy of molecules

E) Mass

Who is credited with discovering the atomic nucleus? A) Dalton B) Gay-Lussac C) Thomson D) Chadwick E) Rutherford

E) Rutherford

Atoms X, Y, Z, and R have the following nuclear compositions: Which two are isotopes? A) X & Y B) X & R C) Y & R D) Z & R E) X & Z

E) X & Z

Which is the correct definition of a diatomic molecule? A) A molecule which contains two or more of the same atoms B) A molecule which contains two or more different atoms C) A molecule which contains two identical atoms D) A molecule which contains two different atoms E) c and d

E) c and d

Atoms of the same element with different mass numbers are called A) ions. B) neutrons. C) allotropes. D) chemical families. E) isotopes.

E) isotopes.

What is the name of P4Se3? A) phosphorus selenide D) phosphoric selenide B) phosphorus triselenide E) tetraphosphorus triselenide C)tetraphosphorus selenide

E) tetraphosphorus triselenide

Burning wood in a fireplace is a __________ change.

chemical