chemistry

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  • Created by: AH1313
  • Created on: 07-12-15 19:28
how are compounds formed?
by chemical reactions
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how can you separate compounds?
by chemical reactions
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what might new experimental evidence led to?
the model being changed or replaced
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what were electrons atoms before they were discovered
tiny undividable spheres
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what were the results from Rutherford and marsdens alpha scattering graphs lead to?
the plumb pudding model
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what was the plumb pudding method?
e atom was imagined to be a sphere of positive charge with negatively charged electrons dotted around inside it like plums in a pudding.
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what did the plumb pudding model suggest?
that the atom was a was a ball of positive charge with negative electrons embedded in it
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what did niels bohr do?
he adapted the nuclear model by suggesting that electrons orbit the nucleus at percific distances
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what happened with james chadwick?
james provided the evidence to show the existence of neutrons within the nucleus
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what is the relative cartage of particles in atoms?
proton +1 neutron 0 and electron -1
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what is the rule inside an atom?
the number of electrons is equal to the number of protons in a nucleus
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what have atoms not got?
an overall charge
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what do all atoms of a particular element have in common?
they have the same number of protons
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what do atoms of different elements have?
different numbers of protons
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why is the periodic table called that?
because similar properties occur at regular intervals
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what are elements called when they react to form positive irons?
metals
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elements that do not form positive irons?
non metals
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were are non metals found on the periodic table?
towards the the right and top of periodic table
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what are elements in group 0 called?
the noble gasses
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what group is called the alkali metals?
group 1
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what group is known as the halogens?
group 7
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what are compounds?
white solids that dissolve in water to create a colourless solution
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what happens the reactivity of the elements going down the groups?
they decrease
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is group 0 reactive
no
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are group 7 metals
no
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what happens when there is a more reactive halogen
it can displace a less reactive one from a aqueous solution of its salt
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what do group one have?
higher melting points
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are group 1 they the most reactive?
no it does not react as vigorously with water or oxygen
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what do elements form in chemical reactions?
compounds
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what are elements in?
fixed proportions
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what do balanced equations tell us?
how much of a reactant we need and how much product should be made
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what is the radius of an atom
0.1nm
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where is the mass of an atom
the nucleus
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mass number=?
sum of protons and neutrons
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atomic nuber=?
number of protons
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what are isotopes?
atoms of the same element with different numbers of neutrons
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what do electrons occupy?
the lowest available energy level
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how should you be able to represent the electronic structure of the first 20 elements?
in the periodic table
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how is the elements in the periodic table arranged?
by atomic number
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what do elements in the same group have?
the same number of electrons in the outer shell
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what are most elements?
metals
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what happens when colourless solutions react with water?
they realise hydrogen and form hydroxides
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what has higher densities and are stronger and harder?
group 1
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Other cards in this set

Card 2

Front

how can you separate compounds?

Back

by chemical reactions

Card 3

Front

what might new experimental evidence led to?

Back

Preview of the front of card 3

Card 4

Front

what were electrons atoms before they were discovered

Back

Preview of the front of card 4

Card 5

Front

what were the results from Rutherford and marsdens alpha scattering graphs lead to?

Back

Preview of the front of card 5
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