Chemistry

Atom
Basic Building Block of Matter
Molecule
Smallest possble part of any sustance
Atomic Mass
Totl number of particles in the nucleus (so no electrons)
Atomic Mass
Totl number of particles in the nucleus (so no electrons)
Atomic Mass
Totl number of particles in the nucleus (so no electrons)
Atomic Mass
Totl number of particles in the nucleus (so no electrons)
Why are group 1 metls so reactive
They react to get a full outer shell.
Have only one electron in the outer shell, which they want to lose.
As you go down the chart the electrons are further away from the nucleus, and the force of attraction is smaller, whic makes the electron easier to lose.
The inner electrons shield the outer electron from the nucleus making it easier to lose.
Group 1 Metals
Alkali Metals
Most reactive metal
Soft metal
Very low denities
Inside is shiny
Equation for Lithium + water and Sodium + Water
(2)Li + (2)H?O —-> (2)LiOH + H2
(2)Na + (2) H?O —-> (2)NaOH + H2
Mixtures
The amount of each substance can vary
Has the properties of each substance in the mixture.
The substances an be easily seperated from eachother.
Compound
The amount of each elent is always fixed.
Has completely diffeemt properties from the elements in the compound.
It is not easy to seperae th elements from the compound. (It needs to be a chemicl reaction)
How to test for hydrogen
Seperate water or any other substance and capture the hydrogen in a testtube.
When a lighted flint is held near the hydrogen a poppping noise is created.
What are group 2 metal known as
Alkaline Earth metals
Ionic Bonding
Where one atom gives or recieves an electron, thus becoming either a negative or positively charged Ion.
Ionic Bonding
Where one atom gives or recieves an electron, thus becoming either a negative or positively charged Ion.
Covalent Bonding
Where two or more atoms share electrons
Group 2 equation with atoms
Mg + HCl —> Mgcl2 + h2
Magnesium + Hydrochlorc acid –> Magnesium Chloride + Hydrogen
Why is group 2 less reactive than group 1
Less reactive because group 2 elements have an extra proton meaning more attraction to the electrons.
Why do halogens get less reactive as they go down
Because as they go down there are more outer shells and the electrons are further away from the nucleus making it harder to attract them
Group 7 elements
Halogens
Bleaching agents
Less reactive
all non metals
Go around in pairs