Chapter 25-Air And Oxygen Flashcards
How do we test for water?
We use anhydrous copper sulfate or cobalt chloride paper.
How do we make oxygen in the laboratory?
By decomposing hydrogen peroxide using manganese dioxide as a catalyst.
Name the 6 properties of oxygen.
Colourless, odourless, tasteless, supports combustion, neutral, slightly soluble in water.
What does carbon dioxide form when it dissolves in water?
Carbonic acid.
Magnesium burns in oxygen to form…
Magnesium oxide.
Magnesium dissolves in water to form…
Magnesium hydroxide.
Carbon burns in oxygen to form…
Carbon dioxide.
Name 3 uses of oxygen.
Burning and welding, space rockets, medicine.
How do we investigate what percentage of air is oxygen?
We burn a night light in a fixed volume of air.
How do we show that carbon dioxide is present in air?
We use a vacuum pump through limewater and observe how it turns milky.
How do we show that water vapour is present in air?
We use salt, ice and anhydrous copper sulfate/cobalt chloride paper.
What is air?
Air is a mixture of gases consisting of 21% oxygen, 78% nitrogen and 1% inert gases and carbon dioxide.
What is the chemical equation for the laboratory preparation of oxygen?
2H2O2-2H2O+O2
What is the word equation for the laboratory preparation of oxygen?
Hydrogen peroxide-water+oxygen
Catalyst=manganese dioxide. (MnO2)
