Chemistry - C2.3

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Atomic Structure, Analysis and Quantative Chemistry

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Chemistry - C2.3
1 In an Atom the number of protons = number of electrons so atoms have no overall charge
1.1 Mass Number = Number of Neutrons + Number of Protons
1.1.1 Number of Neutrons = Mass Number - Atomic Number Atomic Number = Number of Protons
2 Isotopes = Atoms of the same element with the same number of protons but a diferent number of neutrons
2.1 An example of a isotope is carbon
3 Relative atomic mass compares the mass of atoms of a elements have different isotopes and is an average value
3.1 Is an average value because elements have different isotopes with different mass number
3.1.1 The relative atomic mass is found from a periodic table and is the big number from an element
4 Mole is the formula mass of a substance in grams
4.1 Number of Moles = Mass divided by Molar Mass
5 Total of each type of element in reactants = Total of each type of element in products
5.1 Big numbers placed infront of substances in equations only
5.1.1 Atoms are multiplied by the big number
6 % yield = (Actual Mass divided by Theoretical Mass) x 100
6.1 % yield = percentage of what is produced compared to what should have been produced in theory
6.2 Reactants can react in ways that are different to what is expected
6.2.1 Reactions may not go to completion because it is reversible Some products may be lost when it is seperated
7 % mass = (Ar x number if elements x 100) divided by Mr
7.1 Percentage of an element in a compound is calculated using Ar and Mr
8 Mr = E (Ar x Number of Atoms)
8.1 Relative Formula Mass of compound is the sum of the relative atomic masses of the atoms in the formula
9 Empirical Formula = simplest whole number ratio of elements in a compound
9.1 Use the table to calculate
9.1.1 Write out the formula once you have worked it out
10 Balanced Symbol Equation used to find masses of any reactants of products
10.1 Mole quantaties are used to work out masses of substances in the reaction
10.1.1 Used to work out masses of any substances in the reaction
10.2 Use lumpy bicycle or reacting mass equation
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