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Chemistry

Gases in the Atmosphere + Reactions (Section 4)

QuestionAnswer
What are the 4 most abundant gases in the air? 1. Nitrogen 2. Oxygen 3. Argon 4. Carbon dioxide
What percentage of the air is nitrogen? 78%
What percentage of the air is oxygen? 21%
What percentage of the air is argon? 1%
What percentage of the air is carbon dioxide? 0.04%
What happens when magnesium is burned in air? Burns with bright white flame to form white powder
What is formed when magnesium is burned in air? Magnesium oxide
What is the symbol equation for the burning of magnesium in air?Include state symbols 2Mg (s) + O2 (g) ---> 2MgO (s)
What happens when hydrogen is burned in air? Burns with orange/yellow flame and produces water (as water vapour)
How easily does hydrogen react with oxygen? Very easily
What happens when sulfur is burned in air? Burns with pale blue flame to produce sulfur dioxide
When dissolved in water, is magnesium oxide acidic or alkaline? Alkaline
When dissolved in water, is sulfur dioxide acidic or alkaline? Acidic
What are the products of heating a metal carbonate? Metal oxide + Carbon dioxide
When is thermal decomposition? When a substance breaks down into simpler substances when heated
What colour is copper carbonate? Green (powder)
Give the equation for the thermal decomposition of copper (II) carbonate with state symbols CuCO3 (s) ---> CuO (s) + CO2 (g)
Name 2 examples of human activities that affect the amount of carbon dioxide in the atmosphere 1. Deforestation 2. Burning fossil fuels
Name 3 ways in which global warming can cause other types of climate to change 1. Changing rainfall patterns 2. Flooding 3. Sea levels rising
Combustion reactions will always be ____thermic reactions exo
What colour change occurs in the thermal decomposition of copper carbonate? Green ---> black
When heating copper to make copper oxide, what colour change occurs? Pink-brown solid ---> black solid
Created by: JoeMather
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