intoduction to chemistry
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- Created by: A'Myra.101
- Created on: 14-02-18 17:58
What are Isotopes?
Different Weight Same properties
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Which carbon Isotope is most abundent ?
C12 , C13 ,C14
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What is Ionic Bonding ?
complate trasfer of valence elctrons between atoms
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what is covalent bonding
where valence elctrons are shared across a bond
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what does the nuclei of an atom consist of ?
protons and Neutrons
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What do isotpes contain ?
different number of neutrons, therefore have a different mass
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where and what is the mass number
on top ,the total number of protons and neutrons
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what is the atomic number?
number of protons = number of electrons
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how can the number of neutrons be calculated
by mass - atomic number
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what is ionization energy ?
the amount of energy required to move loosley bound electron on outer shell
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what is eletron affinity
amount of energy released or spent when elctron is added to neutral atom
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what happens when the atomic radius increases
the atom doesnt feel the pull because electrons are spread out
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what happens when the attraction falls of with distance
an electron close to the nucleous willl be much more srongly attracted than one further away
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what happens in ionic bonding
loss/gain of an electron by eletrostatic attrction
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what happens in covalent bonding
sharing of lectrons to form a complete octect
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what is a mole
the amount of substance of a system which contains as mamy elementry entities as there are atoms
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what is avogrados constant number
6.023 times 10 to the 23
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how can you work out number of molecules
by avagrados constant number
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how do you caluclate the number of moles in any given mass if you know the molecular formular
mass (g) *molecular mass (mr) =number of moles
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how many moles are in 5.436g of phenol (c6h6o)
94.113g/mol
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what can we determine if we know the number of moles
we can determine the molarity
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what is the molarity if 0.51 moles of compound is dissolved in 500ml
this gives us 1.02 moles per 1000ml or 1l
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what is a mole
amount of substance of a system which contains as many moleules of atoms as there are in 12g of carbon
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what is avagrados costant number
6.023 x 10^23
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how can we determine the number of moles in any given mass if we know the (MR) of a compound
mass of chemical (g) / molecular mass (mr) = number of moles
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149mg of asprin (Mr 180) is dissolved in 50mL water what is the concentration in mg/mL
2.98mg/mL
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149mg of asprin (Mr 180) is dissolved in 50mL water what is the concentration in %w/v
0.298%w/v
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149mg of asprin (Mr 180) is dissolved in 50mL water what is the concentration in ppm
2980ppm
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149mg of asprin (Mr 180) is dissolved in 50mL water what is the concentration in mol/L (M)
0.0165moles/L (M)
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what does stochiometry tell us
the relative ratios of reactants and products in a reaction
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how many valance electrons does carbon have
4
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how many bonds can carbon form
4
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how many valence elctrons does oxygen have
6
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how many valence electrons does nitrogen have
5
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what is precision
the closeness of two or more measurments to eachother
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what is accuracy
thev closeness of a measured value to a standard or known value
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Other cards in this set
Card 2
Front
C12 , C13 ,C14
Back
Which carbon Isotope is most abundent ?
Card 3
Front
complate trasfer of valence elctrons between atoms
Back
Card 4
Front
where valence elctrons are shared across a bond
Back
Card 5
Front
protons and Neutrons
Back
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