C8: Quiz 3 – Answers
1) Hold a lit splint above where the potential hydrogen gas is produced. If you hear a squeaky pop, it means that hydrogen is present.
2) Bubble the gas through limewater (which is calcium hydroxide dissolved in water). If carbon dioxide is present in the gas, the limewater will turn cloudy (a precipitate will form in the lime water [the precipitate is calcium carbonate]).
3) Place a glowing splint above where the potential oxygen is produced (we create a glowing splint by blowing out a lit splint). The glowing splint will relight if oxygen is present.
4) We test for chlorine by placing damp blue litmus paper near where the chlorine gas may be produced. Chlorine bleaches damp blue litmus paper resulting in it turning white; the litmus paper may turn red for a short period of time because the chlorine is acidic.
2) Bubble the gas through limewater (which is calcium hydroxide dissolved in water). If carbon dioxide is present in the gas, the limewater will turn cloudy (a precipitate will form in the lime water [the precipitate is calcium carbonate]).
3) Place a glowing splint above where the potential oxygen is produced (we create a glowing splint by blowing out a lit splint). The glowing splint will relight if oxygen is present.
4) We test for chlorine by placing damp blue litmus paper near where the chlorine gas may be produced. Chlorine bleaches damp blue litmus paper resulting in it turning white; the litmus paper may turn red for a short period of time because the chlorine is acidic.
Questions
1) A reaction produces a gas. Describe how you could test whether the gas produced is hydrogen.
2) A reaction produces a gas. Describe how you could test whether the gas produced is carbon dioxide.
3) A reaction produces a gas. Describe how you could test whether the gas produced is oxygen.
4) A reaction produces a gas. Describe how you could test whether the gas produced is chlorine.
1) A reaction produces a gas. Describe how you could test whether the gas produced is hydrogen.
2) A reaction produces a gas. Describe how you could test whether the gas produced is carbon dioxide.
3) A reaction produces a gas. Describe how you could test whether the gas produced is oxygen.
4) A reaction produces a gas. Describe how you could test whether the gas produced is chlorine.