CLEP-CHEMISTRY sample questions

Question 1

The successive molar ionization energies for an unknown representative element in Period 3 are determined experimentally as follows:
- First ionization energy (IE1): 738 kJ/mol
- Second ionization energy (IE2): 1,451 kJ/mol
- Third ionization energy (IE3): 7,733 kJ/mol
- Fourth ionization energy (IE4): 10,543 kJ/mol

Based on these ionization energy values, which element is being evaluated?

Accepted Answer

Magnesium (Mg)

Answer

Silicon (Si)

Answer

Aluminum (Al)

Answer

Sodium (Na)

Question 2

In the radioactive decay series of uranium-238, a thorium-234 nucleus undergoes beta-minus (β⁻) emission to form an excited daughter nucleus of _____.

Accepted Answer

protactinium-234

Answer

uranium-235

Answer

actinium-234

Answer

radium-230

Question 3

According to valence shell electron pair repulsion (VSEPR) theory, what is the molecular geometry and the orbital hybridization of the central sulfur atom in sulfur tetrafluoride (SF4)?

Accepted Answer

Seesaw geometry with sp3d hybridization

Answer

Trigonal bipyramidal geometry with sp3d hybridization

Answer

Tetrahedral geometry with sp3 hybridization

Answer

Square planar geometry with sp3d2 hybridization

Question 4

Consider the bonding and molecular structure of acrylonitrile, H2C=CH-C≡N. Which TWO of the following statements correctly describe the covalent bonds and orbital hybridization in this molecule? (Select TWO)

Accepted Answer

The molecule contains a total of 6 sigma (σ) bonds and 3 pi (π) bonds.

Accepted Answer

The terminal nitrogen atom is sp hybridized and accommodates one nonbonding electron pair.

Answer

The molecule contains a total of 4 sigma (σ) bonds and 5 pi (π) bonds.

Answer

The central CH carbon atom exhibits sp3 hybridization with tetrahedral bond angles.

Answer

Both carbon-carbon bonds have identical bond lengths and bond energies.

Question 5

True or False: Network covalent solids, such as silicon dioxide (SiO2) and diamond (C), exhibit substantially higher melting points than molecular solids, such as sucrose (C12H22O11) and dry ice (CO2), because melting network solids requires rupturing strong covalent bonds throughout the entire macroscopic lattice rather than disrupting relatively weak intermolecular forces.

Accepted Answer

True

Answer

False

Question 6

A laboratory analyst determines the molar mass of an unknown volatile liquid using the vapor density method. A 0.584 g sample of vapor occupies a volume of 280. mL at a barometric pressure of 745 mmHg and a temperature of 100.0 °C. Assuming ideal gas behavior, what is the approximate molar mass of the compound? (R = 0.08206 L·atm/(mol·K); 1 atm = 760 mmHg)

Accepted Answer

65.1 g/mol

Answer

130. g/mol

Answer

32.6 g/mol

Answer

18.2 g/mol

Free CLEP-CHEMISTRY sample questions

In the radioactive decay series of uranium-238, a thorium-234 nucleus undergoes beta-minus (β⁻) emission to form an excited daughter nucleus of _____.

According to valence shell electron pair repulsion (VSEPR) theory, what is the molecular geometry and the orbital hybridization of the central sulfur atom in sulfur tetrafluoride (SF4)?

Consider the bonding and molecular structure of acrylonitrile, H2C=CH-C≡N. Which TWO of the following statements correctly describe the covalent bonds and orbital hybridization in this molecule? (Select TWO)

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