Half Term 1 Flashcards
Oxidation
Addition of electrons and changes state
Reduction
Obtaining or losing an electron
Properties of metals
High melting point, good conductors of electricity, high density, ductile, good conductors of heat
Metals include
delocalised electrons and metal ions with a +
How to balance chemical equations:
Have to have the same amount of an element on each side e.g: 2fe + cl^2 = 2fecl^3
Mash:
Metal+acid -> salt+hydrogen
Basho:
Base+acid-> salt+ water
Cashoco:
Metal CARBONATE+ acid-> salt+water+carbon dioxide
Endothermic
Requires the absorption of heat
Exothermic
Releases heat/ energy
Neutralisation
The reaction between an acid and base
How does alloying a metal make it better
It can change the properties of metals to make it more desirable
What are the most reactive elements
Alkali metals
Which of the alkali metals are the most reactive
Francium
What are halogen displacements (group7)
When we consider one of the displacement reactions, we can see which element is being oxidised and which is being reduced.
Element
A pure substance that has the same numbers of protons in their nuclei
Molecule
2 or more atoms chemically joined
Compound
2 or more elements chemically joined
Mixture
2 or more substances that are not chemically joined
Why do metals conduct electricity
They allow electrons to flow between the and atoms
Why do metals have high melting points
As they have stronger chemical bonds
Why are metals malleable
The bonds are stonger so they shift and dont break
Alloy
An alloy is when a metal is combined with one or more other metals
What are the signs of a chemical reaction
Color Change.Production of an odor Change of Temperature.Evolution of a gas (formation of bubbles) Precipitate (formation of a solid)
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