Gases Flashcards
Oxygen formula
O2
What is the test for hydrogen gas?
Pop test
Properties of oxygen
Colourless Odourless Reasonably soluble (dissolves well in water) About the same density as air Supports combustion
Equation for the preparation of oxygen
Mn02
H2O2(ag) → H2O(l) + O2(g)
Equation for testing oxygen
C6H12O6 + 6O2 → 6CO2 + 6H2O (+ energy)
Test for oxygen
Burning splint test
How is oxygen made
using hydrogen peroxide (H2O2) with MnO2 catalyst (speeds up reaction)
Properties of hydrogen gas
Colourless
Odourless
Less dense than air
Explosive
Formula for hydrogen
H2
Preparation for hydrogen gas
Hydrogen gas can be prepared by reacting and acid such as Hydrochloric Acid (HCl) with a metal like Zinc (Zn) or Magnesium (Mg).
Preparation equation for hydrogen
Zn(s) + HCl(aq) → H2 (g) + ZnCl2 (g)
Test for hydrogen
Pop test
Reaction equation for hydrogen
H2 (g) + O2 (g) → H2O (g)
What energy does the reaction release
heat, light and sound
Properties of carbon dioxide
Colourless
Odourless
Denser than air
Formula of carbon dioxide
CO2
More properties of carbon dioxide
Carbon Dioxide exists as a gas at room temperature and has boiling point of -78°C.
It exists only as a gas and a solid (called Dry Ice) and changes state directly between these
What is carbon dioxide used for
fire extinguishers, fizzy drinks, wine-making, as a refrigerant, and in welding.
What is carbon dioxide used for
Photosynthesis:
Light
Water + Carbon Dioxide Glucose + Oxygen
What is carbon dioxide produced by
Respiration:
Glucose + O2 H2O + CO2 + Energy
Fermentation:
Glucose Alcohol + CO2 + Energy
Combustion:
Fuel + O2 H2O + CO2 + Energy
Carbon dioxide preparation equasion
CaCO3 + HCl H2O + CO2 + CaCl2
Carbon dioxide test
Limewater test
Uses of hydrogen
Balloons
