Atmosphere composition & testing O₂：練習問題

• a.

  Boiling point

• b.

  Chemical reactivity

• c.

  Solubility in water

• d.

  Density

• a.

  Pink/brown to black; 79 cm\(^3\)

• b.

  Pink/brown to black; 21 cm\(^3\)

• c.

  Black to pink/brown; 21 cm\(^3\)

• d.

  Silvery to white; 79 cm\(^3\)

• a.

  Carbon dioxide is removed before liquefaction because it would otherwise act as a catalyst for the oxidation of nitrogen in the fractionating column.

• b.

  Nitrogen (boiling point \(-196^{\circ}C\)) is collected at the top of the fractionating column because it evaporates more easily than argon (boiling point \(-186^{\circ}C\)) due to weaker intermolecular forces.

• c.

  Helium is the last component to be collected from the bottom of the distillation column because it has the smallest atomic radius and highest density among noble gases.

• d.

  In the glowing splint test for oxygen, the splint relights because the increased concentration of oxygen shifts the equilibrium of the combustion reaction to the right by absorbing heat.

• a.Insert a glowing splint into the test tube; the splint relights.
• b.Insert a glowing splint into the test tube; the splint is extinguished immediately.
• c.Insert a burning splint into the test tube; a 'pop' sound is heard.
• d.Pass the gas through limewater; the limewater turns milky.

• a.

  To chemically convert all noble gases into liquid forms at higher temperatures.

• b.

  To catalyze the reaction between nitrogen and oxygen for easier distillation.

• c.

  To remove dust and carbon dioxide to prevent blockage of the cooling pipes.

• d.

  To increase the percentage of oxygen by removing the less useful nitrogen gas.

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まず自分で答えを書いてから、解説と照らし合わせましょう。

まず自分で答えを書いてから、解説と照らし合わせましょう。