Oxygen (2) Flashcards
What percentage of the air is oxgen
20%
How is oxygen made in the lab
It is made from hydrogen peroxide as it decomposes into water and oxygen
Hydrogen peroxide equation
2H₂0₂ –> 2H₂0 + O₂
The decomposition of hydrogen peroxide is really slow but can be increased with a sprinkle of the catalyst, _____________ oxide
Manganese
You can collect oxygen that’s produced over water by using a _____ _______
Gas syringe
When an element is burnt in air it reacts with the oxygen to form an __________
Oxide
Oxides can be either acidic or ________
Basic
______________ burns with a bright white flame in air and the white powder that is formed is ______________ _________. Magnesium oxide is slightly _________ when it’s dissolved in water
Magnesium
Magnesium oxide
Alkaline
Magnesium oxide is slightly ____________ when it’s dissolved in water
Alkaline
Carbon will burn in air if it’s very strongly heated. It has an __________ flame and it’s produces carbon dioxide gas. Carbon dioxide is slightly __________ when it’s dissolved in water
Orangey/yellow
Acidic
Equation for Magnesium oxidising
2Mg + O₂ —> 2MgO
Equation for Carbon oxidising
C + O₂ –> Co₂
Equation for Sulfur oxidising
S + O₂ —> So₂
Sulfur burns in air or oxygen with a ________ ________ flame.
Pale blue
Sulfur produces sulfur ____________
Sulfur dioxide
Sulfur dioxide is ___________ when it’s burnt in water
Acidic
In general, metal oxides are ________ and non-metal oxides are __________. Some metal oxides react with water to form ____________ solutions. It is important to point out that some metal oxides do not react with water. They test neutral in water because they are _____________ but they are still bases because they react with ________.
Basic Acidic Alkaline Insoluble Acids
Metal oxides are ________
Basic
Non-metal oxides are __________
Acidic
Some metal oxides react with water to form ____________ solutions
Alkaline
Some metal oxides do not react with water. They test neutral in water because they are _____________ but they are still bases because they react with ________.
Insoluble
Acids
