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Chemistry paper 1
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Cards (20)
What are the 5 main
seperating
techniques?
Filtration
Crystallisation
Simple distillation
Fractional distillation
Chromatography
What is the name of group 0, 1 and 7
0 =
Noble gases
1 =
alkali metals
7 =
Halogens
What did Bohr discover?
Adapated the
nuclear
model and discovered
electrons
orbit the
nucleus
What did Chadwick discover
Neutrons
What did Dalton discover
existence of atoms through the atomic theory
What did
Mendeleev
discover?
Order of elements in periodic table and left gaps for undiscovered elements
What did Democritus discover?
particles
What did Thomson discover?
electron
What did
Rutherford
discover?
Nucleus
What was the Rutherford‘s nuclear model?
Heavy
positively
charged nucleus surrounded by a lot of
empty
space and lighter
negatively
charged
electrons
circulating.
What was Thomsons plum pudding model?
Electrons
embedded in a sphere of
positive
charge like a
blueberry
muffin
Properties of Group 0
unreactive as they have a full outershell
do not conduct electricity or heat as they have no delocalised electrons
boiling point increases down the group as the mass increases therefore more energy is required to break them
Properties of Group 1
reactive
as they do not have a
full outershell
melting and boiling point
decreases
as you go
down
as the mass decreases therefore less energy is required to break them
conducts electricity and heat as it has delocalised electrons
Properties of Group 7
highly
reactive
as they are so close to gaining a
full
outer shell
boiling point
increases
as you go
down
because the mass
increases
therefore more
energy
is required to
break
them
Transitional metals compared to group 1 metals?
transition
metals are much
stronger
,
denser
and
harder
Transition metals have
higher
melting points
How do you calculate the number of neutrons, protons and electrons in an atom?
Protons =
mass
number
Electrons =
atomic
number
Neutrons =
mass
number -
atomic
number
Reactivity
series
?
What is an exothermic reaction?
An
exothermic
reaction is a chemical reaction that releases heat to its
surroundings.
What is an
endothermic reaction
?
When
energy
is taken in from its
surroundings
What is the process electrolysis?
using electricity to break down electrolytes to form elements