Definitions Year12 Flashcards Preview

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Flashcards in Definitions Year12 Deck (28):
1

Atomic number

The number of protons in the nucleus of an atom

2

Mass number

The number of both protons and neutrons in the nucleus of an atom

3

Ion

An ion is an atom or group of atoms that carried a positive or negative charge

4

Isotope

Atoms of the same element with different number of neutrons but the same number of protons

5

Atomic mass

The weighted mean mass of an atom of an element compared with on twelfth of the mass of an atom of Carbon-12

6

Isotopic mass

The mass of an atom of an isotope compared with one twelfth of the mass of an atom of Carbon-12

7

Molecular mass

The weighted mean mass of a molecule compared with one twelfth of the mass of an atom of Carbon-12

8

Formula mass

The weighted mean mass of a formula unit compared with one twelfth of the mass of an atom of Carbon-12

9

Orbitals

A given volume of space you have a high probability of finding an electron

10

Ionisation energy

The energy required to remove a mole of electrons from a mile of atoms, in their gaseous state

11

First ionisation energy

The energy required to remove 1 mole of electrons from 1 mole of gaseous atoms

12

Second ionisation energy

The energy required to remove 1 mole of electrons from 1 mole of a gaseous 1+ charged ion

13

Relative atomic mass


(Abundance * isotope mass) + (abundance * isotope mass)
________________________________
100

14

How does the shell fill up?

1s2
2s2
2p6
3s2
3p6
4s2
3d10
4p6

15

Shielding

The more shells that there are the less of the pull from the positive nucleus on the electrons

16

Avogadro constant

The number of atoms per mole of the Carbon-12 isotope

17

Mole

The amount of any substance containing as many particles as there are Carbon atoms in exactly 12g of Carbon-12

18

The equation for mass,amount,molar mass

Amount = mass / molar mass

Mass= amount * molar mass

19

The equation for
Atoms, Avogadro and no. Of moles

Atoms= Avogadro * no. Of moles
Avogadro= atoms / no. Of moles

20

Concentration

The amount of solute, in mol, dissolved per 1dm3 of solution

21

Equation for
Moles, concentration, volume

Moles= concentration * volume

Concentration= moles / volume

22

Standard solution

A solution of known concentration

23

Ideal gas equation

PV=nRT

(R= 8.31)

24

Empirical formula

The simplest whole number ratio of atoms of each element present in a compound

25

Molecular formula

The actual number of atoms of each element in a molecule

26

Salt

A substance where the H+ ions in an acid have been replaced by a positive metal ion or NH4+

27

% yield

Actual amount of product
____________________________ *100
Theoretical (expected)
amount of product

28

Atom economy equation

Mr of desired product
_______________________ *100
Total Mr of all products