Preparation, Uses and Testing For Gases Flashcards
We live in a mixture of gases which is called?
Air
5 composiotions of air are?
Nitrogen
Oxygen
Carbon Dioxide
Noble gas
Water vapour
What is the most abundent constituent of the atmosphere?
Nitrogen
Properties of Nitrogen?
Colourless, odourless, tasteless gas
Same density as air
Insoluble in water
Does not burn or support combustion
Is Nitrogen reactive or non reactive?
Unreactive
Name 2 uses of Nitrogen
Food packaging , Coolant
Is Oxygen reactive or non reactive?
Reactive
What are the properties of Oxygen?
Colourless, odourless, tasteless gas
same density as air
slightly soluble in water
supports combustion
Describe lab preparation of oxygen
1) pour some hyrogen peroxide into a test tube
2) add small amount of manganese dioxide
3) place thumb over test tube to trap gas
4) light a splint and blow it out
5) place glowing splint into test tube and observe
What is the word equation for how hydrogen peroxide decomposses
Hydrogen peroxide - water + oxygen
What does a catalyst do in the prepaation of oxygen?
speeds up the decomposition of hydrogen peroxide
What is the test for oxygen?
Relights a glowing splint
Give 3 uses of oxygen
medicine, welding, rocket engines
Are all nble gases found in air?
Yes, but mostly helium, neon and argon
Are Noble reactive or unreactive gases?
The most unreactive gases
What are the 2 properties of noble gases?
1) colourless, odourless and tasteless gases
2) very unreactive and cannot be made in the lab
Why are noble gases unreactive?
They have a full outer shell of electrons
What is helium used for?
In balloons and airships
What is argon used for?
used in lightbulbs
What is neon used for?
neon lights in advertising
Where does Hydrogen occur?
It does not ccur in air but occurs in water, oil, natural gas and all living things
What are the physical properties of Hydrogen?
1) colourless, odourless ansd tastelessless
2) less dense than air (lightest of all gases)
3) insoluble in water
4) burns explosively in air
Complete the word equation:
Magnesium + Hydrochloric
magnesium chloride +hydrogen
What is the test for hydrogen?
A lighted splint burns with a pop
