Oxygen Flashcards
What are the 3 parts of the fire triangle?
Oxygen heat and fuel
If one of the elements of the fire triangle are removed, then what happens to the fire?
The entire fire goes out
Complete combustion
When a substance burns in sufficient oxygen
What are the products of complete combustion?
CO2, water energy
What is the word equation for complete combustion?
Material + oxygen => carbon dioxide + water (+ energy)
Oxidation
When a substance gains oxygen
Incomplete combustion
When a substance burns in insufficient oxygen
What are the products of incomplete combustion?
Carbon monoxide, carbon
What does the copper look like before it’s burned in oxygen?
Orange and shiny
What does the copper look like after it’s been burned?
Black flaky powder on the surface of the copper + mass increased due to the layer of copper oxide
What is the word equation for the oxidation reaction of copper?
Copper + oxygen => copper oxide
What is the balanced symbol equation for the oxidation reaction of copper?
2Cu + O2 => 2CuO
What happened in the burning copper experiment?
A small amount of copper was placed inside a suspended tube over a Bunsen burner, and syringes of air were placed on either sides. O2 was passed over the copper as it was heated, and the colour changed from shiny + orange to black and grey. After 10 passes of air , the experiment finished. The volume of air at the start was 100ml, but this changed to 79ml at end, demonstrating that there is 21% of O2 in the atmosphere.
What is the test for carbon dioxide?
Turns limewater cloudy when bubbled into it.
What is the test for water?
Blue cobalt chloride paper turns pink in the presence of water.
What happened in the burning phosphorus experiment?
A glass rod was heated on Bunsen burner and was placed on top of a bit of phosphorus in an evaporating dish floating on water in a bell jar. Phosphorus sets alight and the water level begins to rise. The water stops rising above the 20% line. This demonstrates that the % of oxygen is 21%
Are non-metal oxides acidic or alkaline?
Acidic
Do metal oxides exist as solids or gasses?
Solids
Do non-metal oxides exist as solids or gasses?
Gasses
When non-metals are burned in oxygen, the result is a ……… ………. …………..
Non-metal dioxide
When metals are burned in oxygen, the result is a …….. ……
Metal oxide
Word equation for incomplete combustion
Material + oxygen => carbon monoxide + water
Word equation for complete combustion
Material + oxygen => Carbon dioxide + water
What colour flame did sodium have when burned in oxygen?
Bright orange
What colour flame did sulphur have when burned in oxygen?
Bright blue
What colour flame did magnesium have when burned in oxygen?
White
