Structures of Alkanes:
what is the difference between structural (or constitutional) isomers and stereoisomers?
How to depict a molecule using wedges and dashes?
How to write a condensed formula?
How to draw isomers?
Explain predicting melting and boiling point comparisons based on isomer shape?
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List three general uses of gas chromatography in professional settings.
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1. The general formula of alkanes is: (i) CnH2n+2 (ii) CnH2n-2 (iii) CnH2n (iv) CnH2n+4 (v) Cn+2H2n
2. The name of the following compound is: a. Tetrabenzene b. Chrysene c. Coronene d. Anthracene e. Pyrene
3. To achieve noble gas configuration, hydrogen requires………………..whereas chlorine requires…………………in outermost shell. a. Octet, duet b. Singlet, duet c. Duet, octet d. Octet, singlet e. None of the above
4. The ……………. the number of relatively stable resonance contributors, the …………… the resonance energy. a. Higher, lower b. Lower, higher c. Higher, higher d. Lower, lower e. None of the above
5. The other name of Methylbenzene is: (i) Phenyl (ii) Xylene (iii) Pyrene (iv) Toluene (v) Naphthalene
6. In pericondensed polyaromatic hydrocarbon, one or more carbon atoms must be a common member of (i) one (ii) two (iii) three (iv) four (v) five benzene rings.
7. The name of the compound (I) is: H2NCH2CH2CH2CO2H (I) (i) N-methylpropylamine (ii) N,N-dimethylethylamine (iii) 2-aminoethanol v) 4-aminobutanoic acid (v) Succinic acid
8. Benzoyl chloride is an example of (i) Aliphatic acid chloride (ii) Alicyclic acid chloride (iii) Heterocyclic acid chloride (iv) Aromatic acid chloride (v) None of the above
9. Acetyl chloride is an example of (i) Aliphatic acid chloride (ii) Alicyclic acid chloride (iii) Heterocyclic acid chloride (iv) Aromatic acid chloride (v) None of the above
10. Acetic anhydride is an example of (i) Aliphatic acid anhydride (ii) Alicyclic acid anhydride (iii) Heterocyclic acid anhydride (iv) Aromatic acid anhydride (v) None of the above
11. Phthalic anhydride is an example of (i) Aliphatic acid anhydride (ii) Alicyclic acid anhydride (iii) Heterocyclic acid anhydride (iv) Aromatic acid anhydride (v) None of the above
12. Formamide is an example of (i) Aliphatic amide (ii) Alicyclic amide (iii) Heterocyclic amide (iv) Aromatic amide (v) None of the above
13. Benzamide is an example of (i) Aliphatic amide (ii) Alicyclic amide (iii) Heterocyclic amide (iv) Aromatic amide (v) None of the above
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a reaction is second order and found to be 75% complete after 15 seconds. find the half-life of the reaction please show work, thank you!
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How many grams of dry NH4Cl need to be added to 2.10 L of a 0.400 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.58? Kb for ammonia is 1.8×10−5. Express your answer with the appropriate units.
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acid-catalyzed ester hydrolysis yields the organic acid whereas base-mediated ester hydrolysis yields corresponding salt of the organic acid. explain
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Calculate the concentrations of all species in a 0.600 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8.
[HSO3^-]=?
[H2SO3]=?
[OH^-]=?
[H^+]
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What are ways you can determine the amount of a substance that is unknown? Concentration, depth, volume and density? Just formulas like M= D/V ect... Please give an example and explain for 5 star rating.
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Q1: List three variables you could change to improve the effectiveness of the fractional distillation to separating the ethanol from water?
Q2: Why is 200 proof ethanol not food grade while 190 proof one is?
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Phosphorus exists as several allotropes that have varying properties. The enthalpy of transition from white P to red P, ΔtransH, is -18 kJ/mol. The densities of white and red phosphorus are 1.823 and 2.270 g/cm3, respectively. At what temperature does white phosphorus become the stable phase at 625 atm of pressure? Assume the formula for phosphorus is P4.
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which of the following atoms has the largest
ionization energy? O, Li, N, Be or K
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Make a flow chart for the synthesis of Benzoic Acid from phenyl magnesium bromide and carbon dioxide. Using your knowledge of the physical properties of the solvents, reactants, and products, show how the products can be purified. Indicate which layer should contain the product in the liquid/liquid extraction steps.
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Do the following problem by hand using TI30Xa calculator. Do the
problem on a fresh sheet of paper (college ruled, printer paper or
engineering paper). Find the decrease in pressure expected in an
NFL football if it was inflated in a room at 80oF, left in the room
for a while, and brought to field at 40oF, and left there for a
while. Use the ideal gas law to find the decrease in pressure as a
number in psi. The ideal gas law is given by
pv = RT where p is the pressure,
v is the specific volume, R is the universal gas
constant, and
T is the absolute temperature. If any numbers for
variables are needed, go to your favorite internet source or books.
You should seek the least numbers needed
**NOTE: Assume specific volume remains constant. If this is the
case how will you solve the problem? What formulas you will
use?
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Find the pH during the titration of 20.00 mL of 0.1590 M nitrous acid, HNO2 (Ka = 7.1 ✕ 10-4), with 0.1590 M NaOH solution after the following additions of titrant. (a) 0 mL (b) 10.00 mL (c) 15.00 mL (d) 19.00 mL (e) 19.95 mL (f) 20.00 mL (g) 20.05 mL (h) 25.00 mL
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The leaves of the rhubarb plant contain high concentration of diprotic oxalic acid (HOOCCOOH) and must be removed before the stems are used to make the rhubarb pie. If pKa1=1.23 and pKa2=4.19, what is the pH of a 0.0330 M solution of oxalic acid?
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