Chemical Periodicity Flashcards
(39 cards)
What happens to atomic radius across a period?
NC increases as no. of protons increases + SE is relatively constant as e- are added to the same valence shell so there is no change to the no. of inner shell e- –> Increase in ENC –> stronger attraction between the nucleus and the valence e-
valence e- pulled closer to the nucleus –> atomic radius decreases across a period
What happens to atomic radius down a group?
NC increases as no. of protons increases + shielding effect increase as no. of inner e- increase –> EMC unchanged
Distance between nucleus and valence e- increases due to increase in no. of e- shells –> weaker attraction between nucleus and valence e- –> atomic radius increases down a group
What happens to ionic radius across a period?
What happens to ionic radius down a group?
What happens to 1st I.E. across a period?
What happens to 1st I.E. down a group?
What happens to reducing strength of Group 1 metals down the group?
Proportionatal to reactivity (eg. react slowly/quickly/explosively)
What happens to electronegativity across a period?
What is the structure, bonding and nature of the oxide of Na?
Na2O
Structure: Giant ionic structure
Bonding: Ionic bonding
Nature: Basic oxide
What is the structure, bonding and nature of the oxide of Mg?
MgO
Structure: Giant ionic structure
Bonding: Ionic bonding
Nature: Basic oxide
What is the structure, bonding and nature in the oxide of Si?
SiO2
Structure: Giant molecular structure
Bonding: Covalent
Nature: Acidic oxide
What is the structure, bonding and nature of the oxide of Al?
Al2O3
Structure: Giant ionic structure
Bonding: Ionic with covalent character
Nature: Amphoteric oxide
What is the structure, bonding and nature of the oxide of P?
P4O10
Structure: Simple molecular structure
Bonding: Covalent
Nature: Acidic oxide
What is the structure, bonding and nature of the oxide of S?
Structure: Simple molecular structure
Bonding: Covalent
Nature: Acidic oxide
Write the equation of Na2O with water (with state symbols) and state its pH.
Na2O (s) + H2O → 2NaOH (aq)
pH = 13
Write the equation of MgO with water (with state symbols) and state its pH.
MgO (s) + H2O (l) ⇌ Mg(OH)2 (aq)
pH = 9
Write the equation of Al2O3 with water (with state symbols) and state its pH.
Insoluble.
pH = 7
Write the equation of SiO2 with water (with state symbols) and state its pH.
Insoluble.
pH = 7
Write the equation of P4O10 with water (with state symbols) and state its pH.
P4O10 (s) + 6 H2O (l) → 4H3PO4 (aq)
pH = 2
Write the equation of SO3 with water (with state symbols) and state its pH.
SO3 (g) + H2O (l) → H2SO4 (aq)
pH = 2
Write the equation of Na2O with acid (if any with state symbols).
Na2O (s) + 2HCl (aq) → 2NaCl (aq) + H2O (l)
Write the equation of MgO with acid (if any with state symbols).
MgO (s) + 2HCl (aq) → MgCl2 (aq) + H2O (l)
Write the equation of Al2O3 with acid (if any with state symbols).
Al2O3 (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2O (l)
Write the equation of SiO2 with acid (if any with state symbols).
No reaction
