Inorganic memory parts module 2

Question 1

Relative isotopic mass

Answer 1

The mass of an isotope relative to 1/12th of the mass of an atom of carbon-12

Question 2

Relative atomic mass

Answer 2

(Ar) The weighted mean mass of an atom of an element relative to 1/112th the mass of an atom of carbon-12

Ar = total (% abundance x relative isotopic mass) / 100

Question 3

Key ions

Answer 3

• NH4+
• OH-
• NO2-
• NO3-
• HCO3-
• Mno4-
• CO3^2-
• SO4 ^2-
• SO3^2-
• Cr2O7^2-
• PO4^3-

Question 4

Empirical formula

Answer 4

The simplest whole number ratio or atom of each element in a compound

Question 5

Relative molecular mass (Mr)

Answer 5

Compare the mass of a molecule with the mass of an atom of carbon-12

Question 6

Assumption of hydrated salts

Answer 6

• all the water has been lost (reheat crystals until the mass of the residue no longer changes)
• no further decomposition

Question 7

Standard solution

Answer 7

A solution of a known concentration

Question 8

Standard solution

Answer 8

A solution of a known concentration

Question 9

Molar gas volume

Answer 9

The volume per mole of gas molecules at a stated temperature and pressure

Question 10

Ideal gas equation

Answer 10

pV = nRT

P - pressure (Pa) (kpa tp pa x10^3)
V - volume (M3) (x10^-6)
n - moles
R - ideal gas constant
T - temperature (k) (+273)

Question 11

Percentage yield

Answer 11

= actual yield/theoretical yield

Question 12

atom economy

Answer 12

= sum of molar mass of desired products / sum of molar mass of of all products x 100

Question 13

Ionic bonding

Answer 13

The electrostatic attraction between a positive and negative ion.

Question 14

Properties of ionic

Answer 14

• high melting and boiling point
• soluble in polar substances
• good electrical conductor

Question 15

Covalent bonding

Answer 15

the strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atom.

Question 16

Dative covalent bond

Answer 16

A covalent bond in which the shared pair of electrons has been supplied by one of the bonding atoms only

Question 17

What determines shape of molecule

Answer 17

• electrons pairs around the central atom repel each other as far apart as possible
• greater number of electron pairs the smaller the bond angle
• lone pairs repel more strongly than bonded pairs

Question 18

electronegativity

Answer 18

The attraction of the bonded pair of electrons in a covalent bond is electronegativity

Question 19

non polar bonds

Answer 19

the bonded pair of electrons is shared equally between the bonded atoms

Question 20

What affect the strength of intermolecular forces

Answer 20

• the number of electors (the more electrons the mean larger the dipoles, more energy is needed to overcome the intermolecular forces increasing boiling point)

Question 21

Hydrogen bond

Answer 21

a type of intermolecular force found between molecules containing
- an electronegative atoms with lone pair of electrons (O,N,F)
- Hydrogen atom attached