Organic Chemistry Answers

How much 0.1200 M sodium hydroxide solution is need to titrate 13 mL of a 0.120 M sulfuric acid solution? Answer with 2 decimal places.

Explain why the temperature does not rise above its boiling point even though the flask is still being heated. use the words thermal energy in your answer.

Draw all the stereoisomers for 3,4-dibromohexane. Draw them as Fischer projections.

Substitution of alkyl group on the carbonyl carbon decreases the reactivity of the carbonyl compound?

Explain the following:

i)Polyethylene exists either as a linear (straight-chain) polymer or as a branched polymer. Which is in high-density form? Explain.

ii)Draw how H2C=CH2 can be polymerized. What type of polymerization is method is used?
Calculate the energy required in joules to raise the temperature of 450 grams of water from 15°C to 85°C. (The specific heat capacity of water is 4.18 J/g/°C)

The reaction of 2, 3-dimethylbuta-1,3-diene and HBr (1:1 mole) gives two products I and II as shown below:



i) Which of the two products (I or II) is the 1, 4-addition product. Explain the significance of the numbers 1 and 4?

ii) Which of the two products would be more stable? Explain.

iii) The carbocation intermediate that leads to I is given below. What is the structure of the carbocation that leads to II?



iv) Which product I or II is the kinetic product? Explain your choice
v) Which product I or II is the thermodynamic product? Explain your choice

1. You and your lab partner take melting point of the same sample. You observe a melting point of 101-107°C, while your partner observe a value of 110-112°C. Explain how you can get two different values with exactly the same sample.

2. An unidentified compound is observed to melt sharply at 111°C with the vigorous evolution of a gas. The sample then solidifies and does not melt until the temperature reaches 155°C, at which time it again melts sharply. Briefly explain these observations .

A student was given a white solid for an unknown. its melting point range was 119-121°C. The student has previously worked with benzoic acid, and had observed that it was a white crystalline solid with a melting point of 122°C. (a) can the student conclude that the unknown is benzoic acid on the basis of her work to this? why or why not? (b) what additional experiment work should be done to verify this compound?

What is the molarity of HCl(aq) if 17.65 mL of HCl completely reacts with 10.00 mL of 0.250 M K2CO3

2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(l)

If 20.0 g of C2H6 react with 60.0 g of O2, assuming the reaction has gone to completion, calculate the mass (in grams) of water produced in this chemical reaction.