TMSCA Chemistry #8

What is the percentage by mass of water in copper (II) sulfate pentahydrate?

• 80.0 %

• 62.4 %

• 41.9 %

• 36.0 %

• 19.4 %

What is the electron configuration of the oxide ion?

• 1s²2s²

• 1s²2s²2p³

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²

Place the following elements in order of increasing atomic radius

Na Mg N F Cl

• F < N < Cl < Mg < Na

• N < F < Na < Mg < Cl

• Na < Mg < Cl < N < F

• Cl < Mg < Na < F < N

• N < F < Mg < Na < Cl

In which of the following does chlorine have the highest oxidation state?

• NaCl

• NaClO

• NaClO₃

• Cl₂

• OCl₂

What is the pH of the resulting solution when 1.0 L of a solution with pH = 3.0 is added mixed with 1.0 L of solution with pH = 5.0?

• 3.10

• 3.25

• 3.30

• 4.00

• 4.25

Which of these aqueous solutions would have the lowest freezing point?

• 1.0 L of 0.80 M CaCl₂

• 0.50 L of 1.0 M NaCl

• 1.5 L of 0.50 M KCl

• 0.75 L of 0.75 M LiCl

• 2.0 L of 0.50 M MgCl₂

What is the symbol of an atom with 8 protons, 9 neutrons, and 8 electrons?

• ¹⁶₈O

• ⁸₁₆S

• ⁹₁₆S

• ⁹₈O

• ¹⁷₈O

The following cylinder is filled with oxygen gas at 25 degrees Celsius and 2.25 atm of pressure. The V = 283 cubic inches. What mass of oxygen is in the cylinder?

• 118 g

• 64.6 g

• 10.2 g

• 78.4 g

• 13.6 g

What is the molar solubility of calcium hydroxide, Ca(OH)₂? K_sp = 7.9 x 10^-6

• 0.77 M

• 0.39 M

• 0.016 M

• 0.013 M

• 0.00021 M

Given the following:

Xe (g) + F₂ (g) --> XeF₂ ΔH = -123 kJ

Xe (g) + F₂ (g) --> XeF_4. ΔH = -262 kJ

Determine the ΔH for the following:

XeF₂ (g) + F₂ (g) --> XeF₄ (g)

• +201 kJ

• -385 kJ

• +385 kJ

• -139 kJ

• +139 kJ