C6 – Chemistry Out There Flashcards
What is ozone?
O3
What is biodiesel ?
When veg oil is used as an alternative to diesel
What can ultraviolet light cause?
Sunburn, skin cancer, Cataracs
What is the equation to make soap?
Fat + sodium hydroxide =soap + glycerol
What is galvanising
Where a coat of zinc is put on an object, it’s more reactive than I am so will lose its electrons instead of the iron
what is tinning?
Where a coat of tin is applied to an object
What is the equation of rust?
Iron + oxygen= hydrated iron oxide (rust)
How can rust be prevented
Galvanising, tinning, paint, grease, oil
How can limescale be removed
Using a weak acid
calcium carbonate+ hydrogen ions =. Calcium ions + water + carbon dioxide
Why was chlorofluorocarbon, (CFCs) used?
Nonflammable, non-reactive, low boiling points, non-toxic, insoluble in water.
What what CFCs used as
Coolants in fridges, air-conditioning systems, propellants in aerosol cans.
What is used as an alternative to CFCs
Alkanes
Electrolysis of brine it gives hydrogen, chlorine and N a OH:
– Hydrogen gas is given off at (-ve) cathode.
- Chlorine gas given off at (+ve) anode
. – Sodium hydroxide and is left in solution
What is the chemical equation of how to make alcohols when reacted with steam?
Ethene + steam= ethanol
Why does temperature need to be controlled in making alcohols
If it’s too hot yeast will be destroyed if it’s too cold yeast will be inactive
What does fermentation do
Convert sugars into ethanol
What is a fuel cell
An electrical cell supplied with fuel and oxygen and uses of energy from the reaction to generate electrical voltage
What are fuel cells used for?
Replace engines, back up hospital power, power Road signs, in space craft for fuel tanks and water
What is a displacement reaction?
A more reactive metal will displace a less reactive metal from its compound. Displacement reactions involve one metal kicking another one out of a compound
What does hard water do?
Form limescale, and won’t easily form soap lather.
What is the symbol&chemical equation of making alcohol through fermentation?
Glucose = ethanol + carbon dioxide C6H12O6= 2C2H5OH + 2CO2
