atoms and reactions
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- Created by: rayanne vitali
- Created on: 08-10-12 21:01
what date did rutherford began his work?
1909
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who is ernest rutherford ?
the man that done work that led down to the plum pudding model
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what is the name of the physicist that found the modern day structure of an atom?
Neils Bohr
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what are isotopes?
atoms of the same element with different numbers of neutrons
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what is an ion?
a positively or negatively charged atom
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what is the international standard for the measurement of relative mass
the carbon- 12 isotope
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what is the relative isotopic mass?
the mass of an atom of an isotope compared with one twelfth of the mass of an atom of carbon- 12
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whhat two important assumptions are mad when finding the relative isotopic mass ?
* we've neglected electron mass * we've taken the masses of a proton and neutron as both 1
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what is the relative atomic mass?
the weighted mean mass of an atom of an element compared with one twelth of the mass of an atom of carbon- 12
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a sample of bromine contains 53% of bromine-79 and 47% of bromine-81 what is the relative atomic mass ?
79.94 ( using Ar)
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what is relative molecular mass ? ( Mr)
the weighted mean mass of a molecule compared with one twelfth of the mass of an atom of carbon- 12
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define relative formula mass
the weighted mean mass of a formula unit compared with one twelfth of the mass of an atom of carbon- 12
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what is the avogadro constant (Na)
the number of atoms per mole
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how many atoms are there per mole ?
6.02 x 10^23
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what a " a mole" ?
the amount of any substance containing as many particles a there are carbon atoms in exactly 12g of the carbon-21 isotope
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what is molar mass ?
the mass per mole of a substance
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what is the equation for number of moles in a mass ?
amount of moles = mass/ molar mass
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what is an empirical formula ?
the simplest whole number ratio of atoms of each element in a compound.
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analysis showed that 0.6075g of Mg combines with 3.995g of Br , find the molar ratio
MgBr2
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what is molecular formula ?
the actual number of atoms of each element in a molecule
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what does RTP stand for ?
room temperature pressure
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what is the volume per mole of gaseous molecules?
24dm3 mol-1
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what equation can you use to find out the number of moles in a volume ?
n = volume(dm) / 24
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define the concentration of a solution?
the amount of solute(mol) dissolved per dm3
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what is the equation to find the concentration of a solution ?
n= c X v (dm3)
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what's the amount of NaOH dissolved in 25.0 cm3 of a solution of concentration 0.0125 mol/dm?
= 3.125 x 10 ^ -4
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what is a standard solution?
a solution of known concentration.
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what is stoichiometry?
the molar relationship between the relative quantities of substances taking part in a reaction
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what is the definition of an acid ?
a proton donor
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what is the definition of a base ?
a proton acceptor
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what is the definition of an alkali ?
a base that dissolves in water forming OH- ions
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whats the formula of sulfuric acid ?
H2SO4
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whats the formula of hydrochloric acid?
HCl
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whats the formula of nitric acid ?
HNO3
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whats the formula of ethanoic acid and what is it used for ?
CH3COOH in vinegar
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whats the formula and uses of methanoic acid ?
HCOOH in insect bites
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whats the formula of and uses of citric acid ?
C6H8O7 in citrus fruits
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what element are bases ?
metals and ammonia
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whats the formula of ammonia ?
NH3
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whats the formula and use of magnesium oxide ?
MgO for milk of magnesia
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whats the formula and use of calcium hydroxide ?
Ca(OH)2 for lime for treating acid soils
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whats the formula of sodium hydroxide ?
NaOH
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whats the formula of potassium hydroxide ?
KOH
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whats the formula of ammonia ?
NH3
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acid + carbonate --->
salt + CO2 +H2O
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acid + base ---->
salt + water
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acid + alkali --->
salt + water
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what is a cation ?
a positively charged ion
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what an anion ?
a negatively charged ion
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what does anhydrous mean ?
a substance that contains no water molecules
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how is the empirical formula of a hydrated compound unique ?
because the water and compound are separated by a dot
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Other cards in this set
Card 2
Front
who is ernest rutherford ?
Back
the man that done work that led down to the plum pudding model
Card 3
Front
what is the name of the physicist that found the modern day structure of an atom?
Back
Card 4
Front
what are isotopes?
Back
Card 5
Front
what is an ion?
Back
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