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UTSA / Chemistry / CHE 1103 / What is the chemical formula for chromium(iii) hydroxide?

What is the chemical formula for chromium(iii) hydroxide?

What is the chemical formula for chromium(iii) hydroxide?

Description

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Limiting Reactants example:We also discuss several other topics like What is the structural class of amphiarthrosis?

If you want to learn more check out What is known as the land of the profits?

We also discuss several other topics like Who makes art and why?

Don't forget about the age old question of What are the advantages and disadvantages of correlation designs?

Ionization EnergyDon't forget about the age old question of What pertains to how the brain allows us to experience world around us/reaction to it?

Ionization reaction: when neutral atom loses outer electron

                   + We also discuss several other topics like What theory suggests that an organism takes another and lets it live for the benefit of both?

                              +

        - Always absorb energy… amount = ionization energy

Electron attachment reaction neutral atom gains outer electron

                 +                     +   

  1. Normally releases energy… amount = electron affinity
  2. If electron attach to cation, then amount = ionization energy

Oxidation-Reduction Reaction

        Fe(s) + CuSo4(aq)  FeSO4(aq) + Cu(s)

Oxidation #s (assigning)

  1. Elements …. Always O

Ex. He O2

  1. Monoatomic ions .... same charge as ion

Ex.

  1. Oxygen = -2 …. Except in peroxides
  2. Oxidation add up to O … polyatomic ions add up to charge
  3. Hydrogen = +1

42.1 Octane reacts with 52.4g O2(g) and 4.2g CO2 produced

        2C8H18 + 25O2  16CO2 + 18H2O

Mass: C8H18 : 114.23                                     Limiting reactant = ?

        O2     : 32.00                                      Theoretical yield = ?

H2O  : 18.02                                Actual yield of CO2 = ?

CO2   : 44.01

LR: O2  smallest when ÷ by coefficient

TY: CO2    1.6375 mol O2 | 16 mol CO2  = 1.048 mol CO2

                                25 mol O2

AY: 0.0943 mol CO2

%Y: x 100 = 9.1

Excess of each reactant?

C. .0943 mol CO2 | 2 mol C8H18  = .011924

                   16 mol CO2

Standard Element State

        Found at element pressure of Pa (≈ 1 atm) and standard temp usually 25ᐤC

        In other words…

                Metals except mercury (Hg) are solids at standard state

                Most nonmetals = simple solids, except noble gases (g)

                7 diatomic nonmetals:

                                        I2 (s)                F2 (g)

                                        Br2 (l)                N2 (g)

                                        H2 (g)                Cl2 (g)

                                        O2 (g)                

                                        

                Phosphorus (s?)

                Sulfur (s?)  S8(s)

Writing Chem formula with molecular model

Rules:

  • Write elements in order from left to right
  • Exception = Hydrogen; H goes after all elements

Excepts those in 6A/7A (6th and 7th columns)

  • Molecules with only H and 6A/7A exception to H goes in front in these cases.

Atomic size in periodic trends

        Move right = more smaller

        Move up = more smaller

Cations < neutral atom < anions (of same element)

Solubility Rules:

Not soluble = precipitate

Soluble compounds                                        Exceptions (insoluble if…)

, ,

,   ,                                    if  they contain:

, ,                                                , ,

                                                          , , ,

Insoluble compounds                                    Exceptions (soluble) if they contain:

,                                         , , ,

                                                , ,

                

Oxoanion

Polyatomic ion made from central atom bonded to 1+ atoms of Oxygen

Hypo- & -ite = 2 less O atoms          

-ite = 1 less O (P & S have O3 )                

-ate = common (P & S have O4 )              

per- & -ate = 1+ O                                     

 ,  ,                   anion

Naming normal alkanes (n-alkanes)

Alkane = hydrocarbon with no double/triple bonds

Prefix depends on Carbon number:

1 - meth        5-pent                8- oct

2- eth                6- hex                9- non

3- prop                7-hept                10-dec

4- but

Suffix = -ane

Naming binary compounds

Pattern: (Cation) (anion name)

Cation & metal: (name of element) (charge) ion

Ex.          Iron (II) ion

Anion & nonmetal: (1st syllable of element) -ide ion

Number of Proton/Neutron/Electron (Nuclear composition)

Isotope symbol

Atomic No.

Mass No.

Proton No.

Electron No.

 Neutron #

52

24  

24

52

24

22

28

Neutron no. = Mass no.  - Proton no.

Electron no. = atomic no. - charge

Proton no. = atomic no.

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