What are the requirements for fire?
Heat, fuel, oxygen
What is Burning?
When fuel reacts with oxygen to release energy
When does complete combustion occur?
when there is a plentiful supply of oxygen
When does incomplete combustion occur?
when there isn't a plentiful supply of oxygen
What does complete combustion produce?
carbon dioxide and water, releases more energy than incomplete combustion
What does incomplete combustion produce?
carbon monoxide and water OR carbon (soot) and water, releases less energy than complete combustion
What is the word equation for complete combustion?
fuel + oxygen → carbon dioxide + water
What is the word equation for incomplete combustion?
fuel + oxygen → carbon monoxide + water
OR
fuel + oxygen → carbon + water
Write a word and symbol equation for hydrogen burning in oxygen.
hydrogen + oxygen → water
H₂ + O₂ → H₂O
Word equation for methane burning completely in air.
methane + oxygen → carbon dioxide + water
Word equation for ethanol burning in limited oxygen.
ethanol + oxygen → carbon monoxide + water
Word equation for propane burning in limited oxygen.
propane + oxygen → carbon + water
What test and result is for hydrogen.
lit splint in hydrogen, popping sound will be heard
What test and result is for oxygen.
Glowing splint into oxygen, splint relights
What test and result is for carbon dioxide.
bubble carbon dioxide (exhale through tube) through lime-water, lime-water turns cloudy
What test and result is for water.
Anhydrous copper sulfate will turn from white to blue
What is a physical change? (provide an example)
A change that can be reversed without using a chemical reaction e.g melting ice
What is a chemical change? (provide an example)
A change that cannot be reversed without using another chemical reaction e.g cooking an egg
Metal + Acid → Salt + Hydrogen
zinc + hydrochloric acid → zinc chloride + hydrogen
metal carbonate + Acid → Salt + Water + Carbon dioxide
Calcium Carbonate + Nitric acid → Calcium Nitrate + Water + Carbon Dioxide