Term
Write a balanced chemical equation for the reaction
between sodium hydride and water |
|
Definition
NaH + H20 -> NaOH + H2
(hydrides hydrolyze to give hydrogen and hydroxides) |
|
|
Term
| Write a balanced chemical equation for the formation of synthesis gas |
|
Definition
CH4 + H20 -> CO + 3H2
(synthesis gas is a mixture of CO and H2) |
|
|
Term
| Write a balanced chemical equation for the hydrogenation of ethene, H2C=CH2, and give the oxidation number of the carbon atoms in the reactant and product; |
|
Definition
CH2=CH2 + H2 -Ni-> CH3-CH3
(double bonds hydrogenate to give single bonds) |
|
|
Term
| Write a balanced chemical equation for the reaction of magnesium with hydrochloric acid |
|
Definition
Mg + 2HCl -> MgCl2 + H2
(metals react with acid to give hydrogen) |
|
|
Term
Identify the products and write a balanced equation for
the reaction of hydrogen with nitrogen |
|
Definition
N2 + 3H2 -> 2NH3
(oxidize N2) |
|
|
Term
Identify the products and write a balanced equation for
the reaction of hydrogen with fluorine |
|
Definition
H2 + F2 -> 2HF
(reduce F2) |
|
|
Term
Identify the products and write a balanced equation for
the reaction of hydrogen with cesium |
|
Definition
2Cs + H2 -> 2CsH
(oxidize Cs to Cs+) |
|
|
Term
Identify the products and write a balanced equation for
the reaction of hydrogen with copper(II) ions |
|
Definition
H2 + Cu2+ → 2Cu + 2H+
(reduce Cu2+ to metal) |
|
|
Term
| Write the chemical equation for the reaction between cesium and oxygen (cesium reacts with oxygen in the same way as potassium) |
|
Definition
Cs + O2 → CsO2
(gives cesium superoxide) |
|
|
Term
Write the chemical equation for the reaction between
sodium oxide and water |
|
Definition
Na2O + H2O → 2NaOH
(gives sodium hydroxide) |
|
|
Term
| Write the chemical equation for the reaction between lithium and hydrochloric acid |
|
Definition
2Li + 2HCl → 2LiCl + H2
(alkali metal reacts with water to give hydrogen) |
|
|
Term
| Write the chemical equation for the reaction between cesium and iodine |
|
Definition
2Cs + I2 → 2CsI
(similar to sodium plus chlorine) |
|
|
Term
Predict the products of each of the following reactions
and then balance each equation:
(a) Mg(s) Br2(l) -> |
|
Definition
Mg + Br2 → MgBr2
(alkaline earth reacts with halogen) |
|
|
Term
Predict the products of each of the following reactions
and then balance each equation:
(b) BaO(s) Al(s) -> |
|
Definition
3BaO + 2Al → Al2O3 + 3Ba
(similar to thermite) |
|
|
Term
Predict the products of each of the following reactions
and then balance each equation:
(c) CaO(s) SiO2(s) -> |
|
Definition
CaO + SiO2 → CaSiO3
(formation of silicates) |
|
|
Term
|
Definition
| Al2O3 + OH- + 3H2O -> 2Al(OH)4- |
|
|
Term
| Al2O3(s) H3O(aq) H2O(l) -> |
|
Definition
Al2O3 + 6H3O+ + 3H2O → 2Al(H2O)6
3+ |
|
|
Term
|
Definition
|
|
Term
The diatomic molecule BF can be obtained by the
reaction between BF3 and B at a high temperature and low
pressure. (a) Determine the electron configuration of the
molecule in terms of the occupied molecular orbitals and
calculate the bond order. |
|
Definition
Assuming that BF will display the same molecular orbital energy level order as 2
N , the
ground-state electron configuration will be
(σ1s )2 (σ1s
* )2 (σ2s )2 (σ2s
* )2 (π2 p )4 (σ2 p )2 ;
BO =
1 2 (10 − 4) = 3 |
|
|
Term
The diatomic molecule BF can be obtained by the
reaction between BF3 and B at a high temperature and low
pressure.(b) CO is isoelectronic with BF. How
do the molecular orbitals in the two molecules differ? |
|
Definition
(b) The molecular orbitals in CO and BF differ in shape and energy since the atoms involved in bonding have different atomic orbital energies and sizes. The orbitals of BF will
more closely resemble those of HF while those of CO will more closely resemble those of 2N
(see Chapter 4). |
|
|
Term
| Identify the oxidation number of tin in the following compounds and ions: (a) Sn3(OH)42+ |
|
Definition
|
|
Term
| Identify the oxidation number of tin in the following compounds and ions:(b) K2SnO3 |
|
Definition
|
|
Term
| Identify the oxidation number of tin in the following compounds and ions:(c) K2Sn3O7 |
|
Definition
|
|
Term
Balance the following skeletal equations and classify
them as acid–base or redox:
(a) CH4(g) S8(s) S CS2(l) H2S(g) |
|
Definition
| (a) 2CH4(g) + S8(s) → 2CS2(l) + 4H2S(g) (redox) |
|
|
Term
| (b) Sn(s) KOH(aq) H2O(l) S K2Sn(OH)6(aq) H2(g) |
|
Definition
| (b) Sn(s) + 2KOH(aq) + 4H2O(l) → K2Sn(OH)6(aq) + 2H2(g) (redox) |
|
|
Term
Nitrous acid reacts with hydrazine in acidic solution
to form hydrazoic acid, HN3. Write the chemical equation and
determine the mass of hydrazoic acid that can be produced
from 15.0 g of hydrazine. |
|
Definition
HNO2 + H2NNH2 → 2H2O + HN3
15.0 g (1/32.05 g/mol) (43.04 g/mol HN3) = 20.1 g HN3 |
|
|
Term
Suggest a method for preparing
sodium azide, NaN3. |
|
Definition
N2O + 2NaNH2 →NaN3 + NaOH + NH3
my solution: NaOH + HN3 → NaN3 + H2O. |
|
|
Term
Is the production of hydrazoic acid an
oxidation or a reduction of hydrazine? |
|
Definition
The oxidation number of nitrogen in hydrazine is -2, while in hydrazoic acid it is nominally
-1/3 so this is an oxidation process as far as hydrazine is concerned. |
|
|
Term
The common acid anhydrides of phosphorus are P4O6
and P4O10. Write the formulas of their corresponding acids
and chemical equations for the formation of the acids by the
reaction of the anhydrides with water. |
|
Definition
P4O6 + 6H2O → 4H3PO3
P4O10 + 6H2O → 4H3PO4 |
|
|
Term
| Draw the Lewis structure for oleum, (HO)SO2-O-SO2(OH), prepared by treating sulfuric acid with SO3. |
|
Definition
| The formal charges are 0 on all S and O atoms |
|
|
Term
Determine the
formal charges on the sulfur and oxygen atoms (HO)SO2-O-SO2(OH) |
|
Definition
| The formal charges are 0 on all S and O atoms |
|
|
Term
What is
the oxidation number for sulfur in this compound? (HO)SO2-O-SO2(OH) |
|
Definition
|
|
Term
Write the Lewis structure for BrF3. What is the
hybridization of the bromine atom in the molecule? |
|
Definition
|
|
Term
Determine the oxidation number of the noble-gas
element in (a) XeO3; (b) XeO6
4-; (c) XeF2; (d) HXeO4-
|
|
Definition
(a) XeO3 O = -2 Xe = 6
(b) XeO64- Xe=8
(c) XeF2 Xe=2
(d) HXeO4- Xe=6 |
|
|
Term
Explain why the density of vanadium (6.11 gcm3) is
significantly less than that of chromium (7.19 gcm3). Both
vanadium and chromium crystallize in a body-centered cubic
lattice. |
|
Definition
Cr has a smaller radius than V (129 pm vs 135 pm) and a larger atomic mass (52.0 vs 50.94
g/mol)
This provides the estimate (135/129)3 (52.00/50.94) = 1.16. The observed is 1.18 |
|
|
Term
Which of the elements scandium, molybdenum, and
copper is most likely to form a chloride with the formula MCl4?
Explain your answer. |
|
Definition
In MCl4, M has an oxidation number of +4. Referring to Figure 16.6, we see that Mo is the
only element with a +4 oxidation state. |
|
|
Term
Name each of the following complex ions and determine
the oxidation number of the metal: (a) [CrCl3(NH3)2(OH2)]+ |
|
Definition
diammineaquatrichloridochromium(IV) ion
Let x = oxidation number to be determined
x(Cr) + [3 × (−1)] = +1
x(Cr) = +1 − (−3) = +4 |
|
|
Term
Name each of the following complex ions and determine
the oxidation number of the metal:(b) [Rh(en)3)]3+ |
|
Definition
tris(ethylenediamine)rhodium(III) ion
x(Rh) + 3 × (0) = +3
x(Rh) = +3 |
|
|
Term
Name each of the following complex ions and determine
the oxidation number of the metal:[Fe(ox)(Br)4]3- |
|
Definition
tetrabromido(oxalato)ferrate(III) ion
x(Fe) + [1 × (−2)] + [4 × (−1)] = −3
x(Fe) = − 3 − (−6) = + 3 |
|
|
Term
Name each of the following complex ions and determine
the oxidation number of the metal: [Ni(OH)(OH2)5]2+ |
|
Definition
pentaaquahydroxonickel(III) ion
x(Ni) + [5 × (0)] − [1 × (−1)] = + 3
x(Ni) = + 3 |
|
|
Term
Use the information in Table 17.4 to write the formula
for each of the following coordination compounds:(a) triamminediaquahydroxidochromium(II) chloride |
|
Definition
| (a) [Cr(OH)(NH3)3(H2O)2]Cl |
|
|
Term
Use the information in Table 17.4 to write the formula
for each of the following coordination compounds:(b) potassium tetracyanido-Cplatinate(II) |
|
Definition
|
|
Term
Use the information in Table 17.4 to write the formula
for each of the following coordination compounds:(c) tetraaquadichloridonickel(IV) iodide |
|
Definition
|
|
Term
Use the information in Table 17.4 to write the formula
for each of the following coordination compounds:(d) lithium tris(oxalato)cobaltate(III) |
|
Definition
|
|
Term
Use the information in Table 17.4 to write the formula
for each of the following coordination compounds:(e) sodium bromidohydroxidobis(oxalato)rhodate(III) octahydrate |
|
Definition
| (e) Na3[RhBr(OH)(C2O4)2] 8 H2O |
|
|
Term
With the help of Table 17.4, determine the coordination
number of the metal ion in each of the following complexes:(a) [PtBr2(NH3)2]; |
|
Definition
|
|
Term
With the help of Table 17.4, determine the coordination
number of the metal ion in each of the following complexes:(b) [Ni(en)2I2]+ |
|
Definition
|
|
Term
With the help of Table 17.4, determine the coordination
number of the metal ion in each of the following complexes:(c) [Co(ox)3]3- |
|
Definition
|
|
Term
With the help of Table 17.4, determine the coordination
number of the metal ion in each of the following complexes:(d) [Mn(CO)5]- |
|
Definition
|
|
Term
Draw an orbital energy-level diagram (like those in
Figs. 17.29 and 17.31) showing the confi guration of
d-electrons on the metal ion in each of the following complexes:
(a) [Zn(OH2)6]2; Predict the number of unpaired electrons for
each complex. |
|
Definition
|
|
Term
Draw an orbital energy-level diagram (like those in
Figs. 17.29 and 17.31) showing the confi guration of
d-electrons on the metal ion in each of the following complexes:
(b) [CoCl4]2 (tetrahedral). Predict the number of unpaired electrons for
each complex. |
|
Definition
|
|
Term
Draw an orbital energy-level diagram (like those in
Figs. 17.29 and 17.31) showing the confi guration of
d-electrons on the metal ion in each of the following complexes: (c) [Co(CN)6]3; Predict the number of unpaired electrons for each complex. |
|
Definition
|
|
Term
Draw an orbital energy-level diagram (like those in
Figs. 17.29 and 17.31) showing the confi guration of
d-electrons on the metal ion in each of the following complexes:
(d) [CoF6]3. Predict the number of unpaired electrons for
each complex. |
|
Definition
|
|
Term
| what is the most abundant element in the universe? |
|
Definition
| hydrogen; it is a transparent gas under normal conditions, it can form both a cation and an anion |
|
|
Term
| what is made industrially as a by-product of petroleum refining via two reactions? |
|
Definition
|
|
Term
| what are the two reactions for making of hydrogen industrially as a by product of petroleum refining? |
|
Definition
1)steam reforming (using a nickel catalyst)
CH4 + H2O --> CO + 3H2
2)water gas-shift reaction (iron/copper catalyst)
CO + H2O --> CO2 + H2 |
|
|
Term
| what are other sources of hydrogen production? |
|
Definition
1) dissolve metal in acid
2)electrolysis
3)use sunlight to split water: 2H2O -->2H2 + O2 (endothermic by 400 kJ/mol) TiO2 catalysis
4) biological production (photosynthesis by algae in low sulfur environments) |
|
|
Term
| Groups 1-2 form what with hydrogen? |
|
Definition
|
|
Term
| Groups 3-12 form what with hydrogen? |
|
Definition
| metallic hydrides, which are black, powdery, electrically conducting solids; possible hydrogen storage via M + H2 -->MH2 |
|
|
Term
| Groups 13-17 form what with hydrogen? |
|
Definition
| molecular hydrides, many of which are gases |
|
|
Term
| what is hydrogen bonding? |
|
Definition
| compounds with a bond between hydrogen and nitrogen, oxygen, or fluorine-elements with small, highly electronegative atoms-participate in this very strong intermolecular force; it is about 5% as strong as covalent bond between same types of atoms, but ten times stronger than other intermolecular interactions |
|
|
Term
| what do hydrogen bonds come from? |
|
Definition
| partially from coulomb attraction between partial charges and partially from weak bonding interactions |
|
|
Term
| why are hydrogen bonds important? |
|
Definition
1) ice floats because of hydrogen bonds
2) hydrogen bonds hold DNA together
3) hydrogen bonds determine important features of protein structure |
|
|
Term
how are pure alkalis usually made?
electrolysis |
|
Definition
| (Na+) + (Cl-) --> Na + (1/2) Cl2 (g) (Downs Process) |
|
|
Term
|
Definition
| baking soda (bicarbonate of soda)- reacts with weak acid to form CO2 in bread |
|
|
Term
|
Definition
| washing soda (provides carbonate in solution that precipitates Mg2+) |
|
|
Term
|
Definition
oxidizing agent in black gunpowder, also used in matches
2KNO3 + 4C --> K2CO3(s) + 3CO(g) + N2(g) [produces lots of gas so explosion occurs] |
|
|
Term
| how are true alkaline earth metals obtained? |
|
Definition
by electrolysis or by reduction with aluminum in a version of the thermite process:
3BaO + 2Al --> Al2O3 + 3Ba
MgCl2 -->(Mg2+) +2(Cl-) |
|
|
Term
|
Definition
-metallic and nonmetallic properties
-does not react with water
-often quite poisonous |
|
|
Term
| key difference between alkalis and alkali earth salts |
|
Definition
| not water soluble-most notable: CaCO3 |
|
|
Term
| primary uses of alkaline earths |
|
Definition
1)Mg(OH)2 (milk of magnesia)
2) MgSO4-epsom salts-inhibit absorption of water from the intestine, results in defacation
3)quicklime (CaO), which reacts with water to give slaked lime (Ca(OH)2). This is an inexpensive base that is used for agriculture
4)Concrete (gravel plus Portland cement). Portland cement is pellets of CaO mixed with gypsum, CaSO4-2H2O |
|
|
Term
|
Definition
| borax Na2B4O7 xH2O (x=10) |
|
|
Term
| pure B can be used for... |
|
Definition
| production of stiff, light fibers that are used in plastics |
|
|
Term
| boron compounds include... |
|
Definition
1) BF3BCl3 (boron triahalide) is an industrial catalyst, acts as a Lewis acid
2) NaBH4 (sodium borohydride) is an important reducing agent |
|
|
Term
|
Definition
bauxite- a hydrated, impure oxide (Al2O3 xH2O)
found in earths crust |
|
|
Term
| aluminum metal is obtained by? |
|
Definition
| the hall process-to give pure Al. Key to the Hall process is use of an alumina (Al2O3)/cryolite (Na3AlF6) mixture which gives a melt at 950 celsius rather than pure alumina (2050 Celsius) for the elctrolysis |
|
|
Term
|
Definition
1)Al2O3 (alumina) has several crystal forms:
alpha-Al2O3 is corundum, which shows up in sandpaper
gamma-Al2O3 is used in chromatography for adsorption
2) AlCl3 6H2O is used as a deodorant and antiperspirant (kills bacteria) |
|
|
Term
| what are the forms of pure carbon? |
|
Definition
-diamond
-graphite(most stable at room temp.)
-fullerenes (C60)
-carbon nanotubes |
|
|
Term
| other forms of carbon (other than pure carbon) |
|
Definition
1) soot, carbon black are small crystals of graphite-used in ink
2) activated charcoal is highly porous graphitic carbon |
|
|
Term
| other important inorganic carbon compounds: |
|
Definition
1)CCl4, CHCl3, CH2Cl2 (carbon tet, chloroform, methylene chloride) important solvents
2)CF4 (refrigerant), CBr4 (fire extinguishing material)
3)SiC (silicon carbide or carborundum) is used as an abrasive |
|
|
Term
| what is zone refining used for? |
|
Definition
| possible to produce ultra pure Si that are needed for semiconductor manufacturing. In zone refining an electric heater is swept across a cylindrical sample, locally melting the silicon. The impurities collect in the molten state, allowing for their removal. This makes possible the production of Si that is pure to 1 part in 10^9, which is a key requirement of semiconductor of electronics. Zone refining was discovered at Bell Labs in the late 1940s. |
|
|
Term
|
Definition
1)Pure silicon has the diamond structure
2) amorphous silicon (used in photovoltaics)
(no graphitic form of silicon, or fullerenes or tubes as silicon doesn't form double bonds with itself) |
|
|
Term
|
Definition
1)Field effect transitors(discovered at Bells labs by Bardeen, Brattain, Shockley)
2)Solar cells (discovered at Bell labs by Pearson, Chapin, Fuller) |
|
|
Term
| Silicon compounds include: |
|
Definition
1)Silica (SiO2) used in making glass, ceramics
2) Silica gel (hydrated SiO2) used from chromatography media, as a drying agent
3)Aluminosilicates (replace Si4+ by some amount of Al3+ in silica). This has many forms, such as mica, feldspar, cements (after roasting with lime)
4)Silanes, silicone?? (-O-Si-O-Si-) used as lubricants and for waterproofing |
|
|
Term
|
Definition
| a semiconductor similar to Si, but much less important (although the first transistors were Ge) |
|
|
Term
|
Definition
| produced from SnO2 by reaction with C. used in tin cans |
|
|
Term
|
Definition
| produced from PbS (galena) by oxidation, then reaction with C. Used on pipes, glazes, paint in the past, but now phased out because of toxicity. Significant uses now are in X-rays and lead-acid batteries |
|
|
Term
| how is pure nitrogen made? |
|
Definition
| by liquifying air, followed by fractional distillation |
|
|
Term
| what is the industrial process for making ammonia? |
|
Definition
the haber process: it involves the reaction N2+ 3H2 --> 3NH3 (performed at high temperature and pressure and with an iron catalyst)
*this produces 1.6 x 10^10 kg of ammonia each year, and the ammonia that is produced is used in fertilizer, polymers, explosives and many other applications |
|
|
Term
| how is nitrogen fixation accomplished in nature? |
|
Definition
|
|
Term
| important nitrogen compounds: |
|
Definition
1)NH3
2)NH4NO3 explosive and fertilizer
3) NaN3 (sodium azide) this decomposes into Na and N2 when shocked. used in air bags
4) NO2 (nitrogen dioxide), NO (nitric oxide), N2O (nitrous oxide). These oxides of nitrogen show up in many places in modern life. NO2 is a component of song, NO is used in biology for signaling, N2O is an anesthetic
6) HNO3 (nitric acid), HNO2 (nitrous acid), HNO (hyponitrous acid) HNO3 is a strong acid that is used in making fertilizer. HNO2 is used in making nitrites (preservative) |
|
|
Term
| how is superphosphate made? |
|
Definition
| from Ca3(PO4)2 by heating with C and sand |
|
|
Term
| what is stable form of phosphorous? |
|
Definition
P4(white phosphorous). This changes into red phosphorous (chains of linked P4 tetrahedra) when heated in the absence of air
*white phosphorous ignites spontaneously in air; red phosphorous is less reactive, but still can be used in the striking surfaces in matchbooks |
|
|
Term
|
Definition
1) PH3 (phosphine) poisonous gas used in organic chemistry
2) PCl3 and PCl5 used in the synthesis of pesticides, oil additives, flame retardants
3) H3PO4 (phosphoric acid) used in soft drinks, detergents
4) Superphosphate (fertilizer) is a mixture of CaSO4 and Ca(H2PO4)2 |
|
|
Term
| what are metalloids that are produced in pure from their sulfide ores? |
|
Definition
|
|
Term
| most important use of As? |
|
Definition
| in GaAs lasers for CD players. similarly, InSb is another laser system. GaAs is also used in electronics applications as an alternative to Si |
|
|
Term
|
Definition
| by fractional distillation of liquid air. primarily used in steel manufacturing |
|
|
Term
|
Definition
| by photodissociation (O2-->O + O followed by O + O2 --> O3) |
|
|
Term
|
Definition
| S8, it occurs in monoclinic and rhombic forms |
|
|
Term
| important sulfur compounds: |
|
Definition
1) H2S
2) SO2, SO3
3) H2SO3, H2SO4 (the most heavily produced chemical in USA) used in production of fertilizer, petrochemicals, dyes, detergents |
|
|
Term
|
Definition
produced by electrolysis of KF, its a colorless gas (F2) that is highly reactive
-it forms salts that are not as soluble as the chloride salts. this makes F- a much less important component of seawater than Cl-. CaF2 is an essential component of bone, including teeth |
|
|
Term
|
Definition
1)SF6
2)UF6 (used for making nuclear reactor fuel)
3)HF the only weak acid of the hydrogen halides, used for etching of electronic components in the electronics industry |
|
|
Term
| how is chlorine manufactured? |
|
Definition
| from electrolysis of NaCl |
|
|
Term
|
Definition
1)HCl (hydrochloric/muriatic acid)-stomach acid
2)HClO4 perchloric acid (rocket fuel)
HClO3 chloric acid
HClO2 chlorous acid
HClO (hypochlorous acid) active ingredient in chloral
3) many organic compounds (CCl4), chlorinated polymers (PVC) |
|
|
Term
|
Definition
| from chlorine 2(Br-) + Cl2 --> Br2 + 2(Cl-) |
|
|
Term
|
Definition
| colorless gas (F2) that is highly reactive |
|
|
Term
|
Definition
| Br2 is a red-brown liquid |
|
|
Term
| important bromine compounds: |
|
Definition
1)HBr
2)Same acids as with Cl |
|
|
Term
|
Definition
| from chlorine via 2(I-) + Cl2 --> I2 + 2Cl- |
|
|
Term
|
Definition
| I2 is a black solid with purple vapor |
|
|
Term
| important compounds of iodine: |
|
Definition
1)HI
2) Same acids as with Cl |
|
|
Term
| the rare gases are all..? |
|
Definition
|
|
Term
| how are the noble/ rare gases obtained? |
|
Definition
all except He and Rn are by fractional distillation
He comes from natural gas wells in Texas
Rn is found naturally in the ground as a result of radioactive processes |
|
|
Term
| applications of rare gases: |
|
Definition
1)Helium is used for cryogenics, for blimps, for He-Ne lasers
2) Neon, krypton, xenon are used for lighting
3) argon is used for welding in inert atmospheres
4) krypton and xenon are used to make excimer lasers (shortest wavelength commercially available lasers) |
|
|
Term
|
Definition
1) in 1962, Neil Bartlett synthesized XePtF6, which was the first chemical compound involving a rare gas
2) XeF2, XeF4, XeF6, XeO3, XeO4, H2XeO4, XeO6 4- |
|
|
Term
|
Definition
| particles (1nm to 1 micrometer) suspended in a solvent |
|
|
Term
|
Definition
| theory that in colloids the particles are in constant motion, which keeps them from settling out. Also, the particles may be charged, so that electrostatic repulsion keeps them from aggregating |
|
|
Term
|
Definition
1) sol: 1) solid in gas (smoke), aerosol
2) liquid in gas (fog), aerosol
3) solid in liquid (paint)
2)emulsion: liquid in liquid (milk, mayonnaise)
3)gel: solid in liquid that typically has solid texture (jello)
4)foam: gas in liquid
5)solid dispersion: solid in solid (stained glass windows)
6)solid emulsion: liquid in solid (ice cream)
7) solid foam: gas in solid (insulation) |
|
|
Term
| all the d-block elements are... |
|
Definition
| metals, some are good magnets, most are god electrical conductors |
|
|
Term
| the radii of the first row of the d-block are mostly the same, but there is a .... |
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general contraction for the first few (due to the increasing nuclear charge), followed by a slight expansion (due to too many electrons)
*also seen in the second and third rows |
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| contraction of the atomic radii going across the lanthanides; arises because the inner shell electrons of the 3rd row transition metals are so close to the nucleus that relativistic effects are important; this makes the electron heavier, which allows them to be located closer to the nucleus. ex: Au and Pt are less reactive, Hg is a liquid |
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| possible shapes of complexes depend on..? |
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| how many ligands there are (usually connected to the oxidation number) and to the hybridization of the orbitals on the metal atom |
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| elements in the 3rd row of the ... block and ...block have more than 6 ligands |
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| d and f, this leads to the square anti prism structure and dodecahedral structure |
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| example of polydentate ligand? |
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| ethylene diammine(en). leads to the possibility of chelate formation, wherein a bidentate ligand forms a ring with the metal atom as one member. the complex EDTA (ethylene diammine tetra acetic acid) is a hexadentate ligand that is often used to "capture" a metal atom to form an octahedral complex |
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| when do stereoisomers arise? |
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| when the molecule is superimposable on its mirror image |
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| what is an optical isomer? |
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| isomers that are related like an object and its mirror image; identified because they rotate circular polarized light in opposite directions |
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| amminechloridobis(ethylenediamine)chromium(III) chloride |
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| Pentaamminechloridocobalt(III) chloride |
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| Ligands are....in the formula based on the atom which dominates an electron pair |
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| image that th ligands are simple point charges located at the vertices of the octahedron that defines the symmetry of the complex. This creates an electric field that interacts with the metal atom splitting the d-orbitals. This splitting creates low lying excited states that are responsible for the colors of the complexes. |
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| size of splitting in ligands depends on? |
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| associated with weak field ligands |
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| diethylenetriamine (dien) |
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| for octahedral complex, use a basis set consisting of... |
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a)five d-orbitals
b)the s and three p orbitals on the metal
c)the six ligand orbitals |
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| nothing other than orbital theory as applied to transition metal complexes, using the valence electrons on the metal and ligands |
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| advantages of ligand field theory v. crystal field theory |
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in ligand field theory, we can calculate the splittings, and the results are more realistic than with crystal field theory, showing the difference between a strong field and weak ligand field
-allows one to describe more subtle interactions, such as those involving the pi orbitals on the ligands with the metal d-orbitals |
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| +3 oxidation number, reacts with water, used as alloy to strengthen Al |
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| +4 oxidation number, used in aircraft(lightweight). TiO2(rutile) is white paint and semiconductor, photocatalyst (splitting water), |
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| piezoelectric(distorts shape when charged) |
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| +5 oxidation number, used as alloy in steel, V2O5 is an oxidant , used as a catalyst in H2SO4 production |
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| +3 state essential for life(required for insulin to work), available in foods and dietary supplements, +6 state is carcinogenic when airborne |
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| MnO2 is key component of batteries, KMno4 is an oxidizing agent |
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| 3 grams in the body, mostly as hemoglobin |
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| present in vitamin B12, magnets contain Fe, Ni, Co, Al |
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| nickels are 75% Cu, important in many enzymes, urease, hydrogenase |
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| replaces iron for oxygen transport in some animals, used in bronze, brass, pennies |
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| present in many enzymes, galvanized metal in zinc coated, used in batteries |
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the reduction of iron ore (Fe2O3 and FeO) to Fe by CO, CO is produced by burning coke
limestone is added to convert impurities into a molten mixture called slag that can be removed |
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| iron that is made in a blast furnace |
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carbonic anhydrase (hydrolyze CO2 to make HCO3-)
carboxypeptidase (hydrolyzes peptides in digestion)
alcohol dehydrogenase (converts alcohol to aldehyde) |
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nitrogenase is a Fe/Mo protein (nitrogen fixation)
this is part of the nitrogenase complex that also includes reductase (an Fe protein) |
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| cis-[PtCl2(NH3)2] (cis-platin) is used in treating cancer |
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| pernicious anemia, compound contains the only C-Co bond in biology |
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| Down's Process (for alkalines-1) |
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| Al2O3 + Na3AlF6 -> Al+.... |
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Li, Na, K form oxides M2O
Na with excess O2 forms peroxide M2O2
Rb,Cs,Fr forms superoxide MO2 |
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M + H2O -> MOH + H2
reactivity increases m |
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forms oxide, MO
NOT beryllium |
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form metal hydroxides, M(OH)2
not beryllium |
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1)graphite
2)graphene
3)diamond
4)buckyballs
5)nanotube |
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| comes in sheets-sheets of sp2 carbon |
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| C60, has double bonds, somewhere between spy and sp3 |
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1)pure silicon
2)amorphous silicon
3)SiO2
4)Alumina silicates
5)silicone
6)carborundum |
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| -Si-O-Si-O-, water repellant |
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1)corrundum
2)alumina
3)bauxide
4)cryolite |
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| mixture of oxides and hydroxides |
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-radius stays the same from period 5 to period 6
-reactivity of 6 is lower than expected
-why Au is so stable
-period 6 more stable and radius is smaller than expected |
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-aersol
-emulsion/solid emulsion
-gel/sol
-foam/solid foam |
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solid/liquid in gas
-ex: smoke or fog |
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gas in liquid/gas in solid
ex: mayo, salad dressing, insulation in houses |
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