Gases in the Atmosphere

• What is the atmosphere?

  The Earth has an atmosphere which is a layer of gases that surrounds the planet.
• What are the gases that forms the layer which is called the atmosphere?

  Nitrogen, oxygen, argon, carbon, and other gases such as methane, neon, ozone, etc.
• Name the percentages of the gases.

  Nitrogen= 78% Oxygen= 21% Argon= 0.9% Carbon dioxide= 0.04%
• What is the definition of 'greenhouse gases'?

  They are gases which trap heat in the atmosphere.
• What happens as there are more gases trapped in the atmosphere?

  More heat is trapped.
• What happens as there are more heat trapped?


  The world warms, and this is called global warming.
• Which human activities lead to the presence of more CO2 in the atmosphere?

  >Deforestation > Complete combustion.
• What is the symbol of the carbonate compound?

  CO3, 2-
• What happens when you heat carbonates?

  They decompose.
• What is the process called when carbonates decompose?

  Thermal decomposition.
• What is combustion?


  Combustion is the process of burning fuels with excess oxygen.
• What happens when magnesium and oxygen react?

  It burns with a bright white flame and produces magnesium oxide, (white powder)
• Which reaction produces water?

  Hydrogen + oxygen
• All combustions are endothermic.


  Exothermic
• What happens when sulfur and oxygen react?


  It produces sulphur dioxide and yellow powder.
• Which reaction produces carbon dioxide and water?

  Alkanes + oxygen