Question 1

Which of the following represent a pair of isotopes?

Accepted Answer

A)  I and II 
B)  I and III 
C)  I and IV 
D)  II and V 
E)  III and IV 
A)  I and II 
B)  I and III 
C)  I and IV 
D)  II and V 
E)  III and IV D

Question 2

Suppose the isotopic ratio of the two boron isotopes 10B (10.013 amu) and 11B (11.009 amu) in a sample has been altered from the ratio found in nature and now contains 58.73% 10B in the sample. Determine the atomic weight of this sample of boron.

Accepted Answer

A)  10.511 amu 
B)  10.013 amu 
C)  11.009 amu 
D)  10.424 amu 
E)  10.498 amu 
A)  10.511 amu 
B)  10.013 amu 
C)  11.009 amu 
D)  10.424 amu 
E)  10.498 amu D

Question 3

Which element has an atomic number of 35 and mass number of 80?

Accepted Answer

A)  (35Hg) 
B)  (35Cl) 
C)  (35Br) 
D)  (80Hg) 
E)  (80Br) 
A)  (35Hg) 
B)  (35Cl) 
C)  (35Br) 
D)  (80Hg) 
E)  (80Br) E

Question 4

Three elements that are likely to have similar chemical and physical properties are:

Accepted Answer

A)  B, C, Si 
B)  Ca, Co, Cr 
C)  Cu, Ag, Au 
D)  H, He, Ne 
E)  Pb, Bi, Po 
A)  B, C, Si 
B)  Ca, Co, Cr 
C)  Cu, Ag, Au 
D)  H, He, Ne 
E)  Pb, Bi, Po

Question 5

Write the atomic symbol for an atom that contains 24 protons, 24 electrons and 26 neutrons.

Accepted Answer

The answer of Write the atomic symbol for an atom...

Question 6

Discuss what role Rutherford's gold foil experiment had in leading to the modern model of the atom.

Accepted Answer

The results of Rutherford's gold foil ex

Question 7

Assume that only two isotopes of argon,   and   exist in nature. If this were true, the atomic weight of sulfur would fall most closely within which range?

Accepted Answer

A)  16-33.5 amu 
B)  16-34 amu 
C)  16-50 amu 
D)  32-34 amu 
E)  48-50 amu 
A)  16-33.5 amu 
B)  16-34 amu 
C)  16-50 amu 
D)  32-34 amu 
E)  48-50 amu

Question 8

Which sample contains the same number of atoms as 175.0 g of cadmium (Cd)?

Accepted Answer

A)  225 g Pb 
B)  175 g Hg 
C)  307 g Au 
D)  142 g Ir 
E)  305 g Sn 
A)  225 g Pb 
B)  175 g Hg 
C)  307 g Au 
D)  142 g Ir 
E)  305 g Sn

Question 9

How many millimeters are in 0.457 yards?

Accepted Answer

A)  11.6 mm 
B)  54.8 mm 
C)  139 mm 
D)  418 mm 
E)  4570 mm 
A)  11.6 mm 
B)  54.8 mm 
C)  139 mm 
D)  418 mm 
E)  4570 mm

Question 10

Which statement best describes isotopes?

Accepted Answer

A)  atoms in the same vertical family 
B)  atoms with the same number of protons and different numbers of neutrons 
C)  atoms with the same number of neutrons and a different number of protons 
D)  atoms with the same numbers of protons and neutrons 
E)  atoms in the same horizontal period 
A)  atoms in the same vertical family 
B)  atoms with the same number of protons and different numbers of neutrons 
C)  atoms with the same number of neutrons and a different number of protons 
D)  atoms with the same numbers of protons and neutrons 
E)  atoms in the same horizontal period

Question 11

Which element can be classified as a lanthanide?

Accepted Answer

A)  Th 
B)  Ti 
C)  Tl 
D)  Tc 
E)  Tb 
A)  Th 
B)  Ti 
C)  Tl 
D)  Tc 
E)  Tb

Question 12

Which of the following is the most correct for the cathode ray experiments?

Accepted Answer

A)  The ray bent towards the positive exterior plate, proving that the ray was made up of negative particles. 
B)  The cathode ray experiment can be considered equivalent with the discovery of electrons. 
C)  The behavior of the ray was independent of the metal chosen to make the plates in side the vacuum tube, proving that all metals contain a common particle. 
D)  All of these. 
E)  None of these. 
A)  The ray bent towards the positive exterior plate, proving that the ray was made up of negative particles. 
B)  The cathode ray experiment can be considered equivalent with the discovery of electrons. 
C)  The behavior of the ray was independent of the metal chosen to make the plates in side the vacuum tube, proving that all metals contain a common particle. 
D)  All of these. 
E)  None of these.

Question 13

Converting 127 pounds to kilograms yields:

Accepted Answer

A)  50.3 kg. 
B)  57.6 kg. 
C)  280 kg. 
D)  326 kg. 
E)  1280 kg. 
A)  50.3 kg. 
B)  57.6 kg. 
C)  280 kg. 
D)  326 kg. 
E)  1280 kg.

Question 14

An element that has 32 protons and 52 neutrons has an approximate atomic weight of:

Accepted Answer

A)  20 amu. 
B)  32 amu. 
C)  52 amu. 
D)  60 amu. 
E)  84 amu. 
A)  20 amu. 
B)  32 amu. 
C)  52 amu. 
D)  60 amu. 
E)  84 amu.

Question 15

Which sample contains the fewest number of atoms?

Accepted Answer

A)  216 g Cr 
B)  435 g Ni 
C)  512 g Mn 
D)  619 g Pt 
E)  642 g Rb 
A)  216 g Cr 
B)  435 g Ni 
C)  512 g Mn 
D)  619 g Pt 
E)  642 g Rb

Question 16

Which sample contains the greatest number of atoms?

Accepted Answer

A)  50 g Ba 
B)  50 g Br 
C)  50 g Ca 
D)  50 g Ti 
E)  50 g P 
A)  50 g Ba 
B)  50 g Br 
C)  50 g Ca 
D)  50 g Ti 
E)  50 g P

Question 17

Which element can be classified as a noble gas?

Accepted Answer

A)  Cl 
B)  No 
C)  Ne 
D)  P 
E)  S 
A)  Cl 
B)  No 
C)  Ne 
D)  P 
E)  S

Question 18

Which element can be classified as an alkaline earth metal?

Accepted Answer

A)  Al 
B)  Mg 
C)  Ag 
D)  Au 
E)  Na 
A)  Al 
B)  Mg 
C)  Ag 
D)  Au 
E)  Na

Question 19

An element containing 26 protons, 26 electrons and 30 neutrons will have the symbol:

Accepted Answer

A)  (82Te). 
B)  (52Zn). 
C)  (56Fe). 
D)  (56Zn). 
E)  (52Te). 
A)  (82Te). 
B)  (52Zn). 
C)  (56Fe). 
D)  (56Zn). 
E)  (52Te).

Question 20

Electromagnetic radiation having a wavelength of 475 nm is in the blue region of the visible spectrum. Converting this wavelength into centimeters yields:

Accepted Answer

A)  4.75 × 10-7 cm. 
B)  4.75 × 10-6 cm. 
C)  4.75 × 10-5 cm 
D)  1.86 × 10-4 cm. 
E)  1.86 × 10-3 cm. 
A)  4.75 × 10-7 cm. 
B)  4.75 × 10-6 cm. 
C)  4.75 × 10-5 cm 
D)  1.86 × 10-4 cm. 
E)  1.86 × 10-3 cm.

Which of the following represent a pair of isotopes?

Suppose the isotopic ratio of the two boron isotopes ¹⁰B (10.013 amu) and ¹¹B (11.009 amu) in a sample has been altered from the ratio found in nature and now contains 58.73% ¹⁰B in the sample. Determine the atomic weight of this sample of boron.

Which element has an atomic number of 35 and mass number of 80?

Three elements that are likely to have similar chemical and physical properties are:

Write the atomic symbol for an atom that contains 24 protons, 24 electrons and 26 neutrons.

Discuss what role Rutherford's gold foil experiment had in leading to the modern model of the atom.

Assume that only two isotopes of argon, and exist in nature. If this were true, the atomic weight of sulfur would fall most closely within which range?

Which sample contains the same number of atoms as 175.0 g of cadmium (Cd)?

How many millimeters are in 0.457 yards?

Which statement best describes isotopes?

Which element can be classified as a lanthanide?

Which of the following is the most correct for the cathode ray experiments?

Converting 127 pounds to kilograms yields:

An element that has 32 protons and 52 neutrons has an approximate atomic weight of:

Which sample contains the fewest number of atoms?

Which sample contains the greatest number of atoms?

Which element can be classified as a noble gas?

Which element can be classified as an alkaline earth metal?

An element containing 26 protons, 26 electrons and 30 neutrons will have the symbol:

Electromagnetic radiation having a wavelength of 475 nm is in the blue region of the visible spectrum. Converting this wavelength into centimeters yields:

The Nature of Chemistry

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Exam 2: Atoms and Elements

Which of the following represent a pair of isotopes?

Suppose the isotopic ratio of the two boron isotopes 10B (10.013 amu) and 11B (11.009 amu) in a sample has been altered from the ratio found in nature and now contains 58.73% 10B in the sample. Determine the atomic weight of this sample of boron.

Which element has an atomic number of 35 and mass number of 80?

Three elements that are likely to have similar chemical and physical properties are:

Write the atomic symbol for an atom that contains 24 protons, 24 electrons and 26 neutrons.

Discuss what role Rutherford's gold foil experiment had in leading to the modern model of the atom.

Assume that only two isotopes of argon, and exist in nature. If this were true, the atomic weight of sulfur would fall most closely within which range?

Which sample contains the same number of atoms as 175.0 g of cadmium (Cd)?

How many millimeters are in 0.457 yards?

Which statement best describes isotopes?

Which element can be classified as a lanthanide?

Which of the following is the most correct for the cathode ray experiments?

Converting 127 pounds to kilograms yields:

An element that has 32 protons and 52 neutrons has an approximate atomic weight of:

Which sample contains the fewest number of atoms?

Which sample contains the greatest number of atoms?

Which element can be classified as a noble gas?

Which element can be classified as an alkaline earth metal?

An element containing 26 protons, 26 electrons and 30 neutrons will have the symbol:

Electromagnetic radiation having a wavelength of 475 nm is in the blue region of the visible spectrum. Converting this wavelength into centimeters yields:

The Nature of Chemistry

Chemical Compounds

Quantities of Reactants and Products

Chemical Reactions

Energy and Chemical Reactions

Electron Configurations and the Periodic Table

Covalent Bonding

Molecular Structure

Gases and the Atmosphere

Liquids, Solids, and Materials

Chemical Kinetics: Rates of Reactions

Chemical Equilibrium

The Chemistry of Solutes and Solutions

Acids and Bases

Additional Aqueous Equilibria

Thermodynamics: Directionality of Chemical Reactions

Electrochemistry and Its Applications

Nuclear Chemistry

Filters

Suppose the isotopic ratio of the two boron isotopes ¹⁰B (10.013 amu) and ¹¹B (11.009 amu) in a sample has been altered from the ratio found in nature and now contains 58.73% ¹⁰B in the sample. Determine the atomic weight of this sample of boron.