Expected knowledge Aug 19
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Why can acids never have zero OH- ions present
Because acids are aqueous solutions and the dissociation of water means some OH- ions must be present
What is the test for Water
Turns cobalt chloride paper from blue to pink
Electrolysis
Breaking apart a compound using electricity
Functional Group
The part of a molecule that is responsible for its chemical (and sometimes physical) properties.
Exothermic
A reaction that releases energy
What is the test for unsaturated compounds?
Rapidly decolourises bromine solution
Neutralisation of acids
Removing excess H+ aqueous ions from a solution
Acid
Solution containing a higher number of H+ aqueous ions than OH- aqueous ions
Why can alkalis never have zero H+ ions present
Because alkalis are aqueous solutions and the dissociation of water means some H+ ions must be present
isomers
molecules whic have same molecular formula Different structural formula
Covalent bond
A shared pair of electrons
Noble gases
Unreactive group 8 elements
Base
A substance that neutralises an acid
Indicator
A substance that changes colour when something is added to it
What are the 7 diatomic elements
Iodine Hydrogen Nitrogen Bromine Oxygen Chlorine Fluorine
What is the test for Oxygen
Relights a glowing splint
Electricity
The flow of charged particles(electrons and ions)
Salt
When the H+ aqueous ions of an acid are replaced by metal (or ammonium) ions • sulphuric acid gives sulphate salts • hydrochloric acid gives chloride salts • nitric acid gives nitrate salts
What are the properties of neutrons
Charge: 0 Mass: 1 a.m.u Found: in the nucleus
Acidic oxide
Non metal oxide that is soluble in water
Fuel
A substance that burns to release energy
Mass number
The sum of the number of protons and neutrons in an element
Halogen
Any of the group 7 elements
Diatomic
A molecule containing two atoms