Period 3 Flashcards
Rank elements of period 3 from highest melting point to lowest
Si>Al>Mg>Na>s8>p4>cl2>Ar
What are the products when Na reacts with O2
Na2O
What are observations when Na reacts with O2
White solid
Yellow flame
Products of Mg reaction with O2
MgO(s)
Observation of Mg reaction with O2
White solid
White flame
Products when Al reacts with O2
Al2O3(s)
Observations when Al reacts with O2
White solid
Bright white flame
Observation and product of reaction of Si with O2
SiO2(s)
Grey/white solid
Very slow reaction
What are products when P4 reacts with O2 in limited heat
P4O6 (s)
What are products when P4 reacts with O2 in excess heat
P4O10(s)
Observations of reaction of P4 woth O2
White solid
White flame
Product and observation of reaction of S8 with O2 with heat
SO2 (colourless gas)
Blue flame
Yellow solid disappears
What are the conditions of reaction of SO2 with O2
V2O5-catalyst
Heat
Product formed-SO3
Name the type of reaction when period 3 elements react with oxygen
Exothermic Redox
Name the basic period 3 oxides
Na2O
MgO
Name an amphoteric oxide in period 3 and describe its bonding and structure
Al2O3
Ionic with covalent character
Giant ionic
Name the acidic oxides in period 3
SiO2 P4O6 P4O10 SO2 SO3
What are the products of the reaction
Na2O + H2O—-> ?
And what is pH of solution
NaOH(aq)
PH=14 (alkaline)
MgO+H2O—->?
pH of solution?
Mg(OH)2 (aq)
pH=8 (slightly alkaline)
Al2O3 + H2O—->
Insoluble
SiO2 + H2O—->
Insoluble
P4O6 + H20—->?
pH=?
H3PO3
pH=3
P4O10+H2O—–>?
pH=?
H3PO4
pH=3
SO2 + H2O—->?
pH=?
H2SO3(aq)
pH=2
SO3 + H2O—–> ?
pH= ?
H2SO4
pH=1
Acidic
Na2O + HCl—–>?
NaCl+H2O
MgO+HCl—->
MgCl2+ H2O
Al2O3 + HCl—–>
AlCl3 + H2O
Al2O3 + NaOH (excess)—->
NaAl(OH)4
SiO2 + conc. Hot NaOH—->
Na2SiO3 + H2O
P4O6 + NaOH—->
Na3PO3 + H2O
P4O10 + NaOH—->
Na3PO4+H2O
SO2 + NaOH—->
Na2SO3 + H2O
SO3(g) + NaOH—->
Na2SO4 + H2O
What is the anion of SO2
SO3²-
What is the anion of SO3
SO4²-
What is the anion of P4O6
PO3³-
What is the anion of P4O10
PO4³-
What is the anion of CO2
CO3²-
What is the anion of SiO2
SiO3²-
What are the anions of NO2
NO3- and NO2-
Basic Oxide + Acidic Oxide—>?
Salt only
Na+H2O—->
Na(OH) + H2(g)
Mg + H2O—->
Mg(OH)2 slow reaction
Mg + H2O(g)/steam—->
MgO + H2 (g) vigerous reaction
Na+Cl2(g)——>?
Observations
NaCl
White solid
Yellow flame
Mg + Cl2—->?
Observations?
MgCl2(s)
White solid
White flame
2Al + 3Cl2—->
Observations?
Al2Cl6
White solid
White flame
Si + Cl2—->
Observation?
SiCl4 (l)
Colorless liquid
P4 + (limited) Cl2 —–>
Observation?
PCl3
Colorless liquid
White flame
P4 + excess Cl2 —->
Observation?
PCl5
White solid
White flame
Type of reaction between period 3 elements amd Cl2?
Exothermic Redox
Conditions for reaction of period 3 elements with O2 and Cl2
Heat
Describe the structure and bonding in NaCl
Ionic bonding
Giant Ionic lattice
Describe the structure and bonding in Al2Cl6
Covalent
Simple molecular structure
Describe structure and bonding in PCl5
Covalent
Simple molecular structure
What happens when NaCl is placed in water
Dissolves
Na+(aq) Cl- (aq) ions
pH= 7 (neutral)
What happens when MgCl2 is added to water
Mg²+(aq) Cl-(aq)
Dissolves
pH= 6.5
Slightly acidic
AlCl3 + H2O—>
Partial hydrolysis
[Al(OH)(H2O)5]+2 + H+ 3Cl-
pH=3 (slightly acidic)
SiCl4 + H2O—->
Observations?
SiO2/ Si(OH)4 + 4HCl White fumes of HCl gas White ppt Complete hydrolysis pH= 2 (acidic)
PCl3 + H2O—->
Complete hydrolysis
H3PO3 + HCl
pH= 2
PCl5 + H2O—->
Complete hydolysis
H3PO4 + HCl(g)
pH= 2
acidic chlorides react with water to form acidic solutions
Is nitric acid a strong or weak acid
Strong
Is phosphoric and phosphurous acid strong or weak?
Weak
Is sulfurous acid a strong or weak acid?
Weak
Describe lattice structure of SiO2
Giant
Tetrahedral
4 Si-O bonds
Observation when PCl5 reacts with excess water
Steamy/misty fumes
Describe as fully as you can what would you see when sodium is reacted with water
Metal floats
Dissolves
Vigerous reaction
Effervescence of H2 gas
