Group 14-Big Daddy Petr Flashcards
True/False, group exhibits more metallic character going down the group?
True
Define catenated, and state if compounds going down the group are likely to form these type of compounds.
To form chains of the same element.
Unlikely because BE decreases down the group.
True/False, group 14 has smaller inert pair effect than gp 13.
True
What causes Ge radius to be bigger than expected?
What causes Ei of Pb to be larger than expected?
Why does that happen for Pb and not Ge?
D-block contraction.
F-block contraction and relativistic.
Ge does not fill f-block and Pb is much larger so feels relativistic effects greater(period 6).
Explain the structures of CO2 and SiO2, why does this happen?
CO2=linear (gas at rtp)
SIO2=network(solid at rtp)
C,N,O all form strong pi-bonds with each other.
C and SI are strong oxophiles. Explain this term.
Form a series of oxoanions.
Explain the structure of diamond.
Covalent network with each C bonded to 4 others (tetrahedron). Hardest natural substance, highest thermal cond, but is an electric insulator.
Explain the structure of graphite.
Planar graphene layers, each C has 3 neighbours, forms sigma sp2 bonds, and p orbital overlap. Weak overlap causes layers to slide and be slippery. Elec cond, diamond->graphite is possible but fucking slow.
Explain fullerenes(buckyballs)
Discrete molecules that are formed of 5 or 6 membered carbon rings. Soluble in organic solvents.
Explain the structure of graphene.
Isolated plane of graphite, can be rolled into nanotubes. Very high tensile strength. Can form carbon fibres where they are crumpled together.
SIO2+2C–>?
?+2Cl2–>SiCl4
SiCl4+2H2–>??
?=Si +2CO
??=Si + 4HCl
Tin is used in what alloy?
Why might Pb be decreasing in use?
Bronze
Toxicity
C and Co are examples of good what? Where is the HOMO present on CO? What does this do to low valent metal complexes? Why is it bad if inhaled.
Reducing agents. On the C. It stabilises them. It bonds to haemoglobin instead of O2 as more stabilising.
Silicates and silica crystallise slowly, how is this overcome?
Collected as amorphous glasses. Resemble their liquid equiv.
What is a zeolite?
An aluminosilicate with open cavities.
