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Organic Chemistry
The thermite reaction is very exothermic, the heat of the reaction sufficient to melt the iron that is produced by the reaction:
2Al + Fe2O3 Al2O3 + 2Fe H=?
a) calculate the standard enthalpy change for this reaction?
b) if 40.0 g of iron (III) oxide we’re reacted with excess aluminum, how much heat would be produced ?
c) of the heat produced was used to heat 2.00L of water at 23.0C, what would the final temperature of the water be?
2Al + Fe2O3 Al2O3 + 2Fe H=?
a) calculate the standard enthalpy change for this reaction?
b) if 40.0 g of iron (III) oxide we’re reacted with excess aluminum, how much heat would be produced ?
c) of the heat produced was used to heat 2.00L of water at 23.0C, what would the final temperature of the water be?
Organic Chemistry
A calorimeter is used to try To determine the enthalpy of combustion of a candle. The calorimeter contains 7.50 x 10^2 mL of water. The initial mass of the candle is 42.3g and the initial temperature of the water is 18.1 C. After being allowed to burn for a period of time, the candle is re-measured to have a mass of 38.8g and the temperature of the water is 55.6C.
a) how much heat energy was transferred into the water ?
b) how much energy was transferred per gram of paraffin wax?
c) How much energy was transferred per mile of paraffin wax?
d) If the theoretical enthalpy of combustion of paraffin wax is -42kj/g, what is the percentage difference ?
a) how much heat energy was transferred into the water ?
b) how much energy was transferred per gram of paraffin wax?
c) How much energy was transferred per mile of paraffin wax?
d) If the theoretical enthalpy of combustion of paraffin wax is -42kj/g, what is the percentage difference ?
Organic Chemistry
A 1L sample of gas at 1atm pressure and 298K expands isothermally to 10L. It is then heated to 500K, compressed to 1L and then cooled 298K. What is the ∆E of the process?
Organic Chemistry
The pH of a lake is 8.0. Over a 10 year period, the pH of the water becomes 1000x more
acidic.
(a) Name an ion that has increased in the water over the 10 years? [1 Mark]
(b) What is the pH now? [3 Marks]
(c) Why does pure water have a neutral pH at 25oC? [3 Marks]
(d) The pH of pure water at 60°C is 6.51. Determine the value of Kw at this
temperature. [3 marks]
acidic.
(a) Name an ion that has increased in the water over the 10 years? [1 Mark]
(b) What is the pH now? [3 Marks]
(c) Why does pure water have a neutral pH at 25oC? [3 Marks]
(d) The pH of pure water at 60°C is 6.51. Determine the value of Kw at this
temperature. [3 marks]
Organic Chemistry
List the electrophiles involved in the alkylation, acylation, nitration, halogenation and sulphonation of benzene
Organic Chemistry
What are the products of reaction of muscone with bromine in presence of NaOH?
Organic Chemistry
When oxygen burned in oxygen, heat energy is transferred to the surroundings.
Questions:
1) State the name which is given to a reaction in which heat is transferred to the surroundings.
2)Write a chemical equation to represent the reaction that takes place when hydrogen burns in oxygen.
3)Describe a chemical test to show that the product is water.
4)Describe a physical test to show that the product is pure water.
Questions:
1) State the name which is given to a reaction in which heat is transferred to the surroundings.
2)Write a chemical equation to represent the reaction that takes place when hydrogen burns in oxygen.
3)Describe a chemical test to show that the product is water.
4)Describe a physical test to show that the product is pure water.
Organic Chemistry
4. I. Which of the following mixtures are miscible liquids?
a. Pentane and acetic acid
b. Oil and water
c. 1,1,1,1-tetrachloromethane and ethanol
d. Methanol and ethylamine
II. Liquid-liquid miscible mixtures can be separated through
a. chromatography
b. fractional distillation
c. filtration
d. both a and b
III. In fractional distillation, a large surface area for condensation is provided through
a. a thermometer
b. water bath
c. a fractionating column
d. reflux condenser
a. Pentane and acetic acid
b. Oil and water
c. 1,1,1,1-tetrachloromethane and ethanol
d. Methanol and ethylamine
II. Liquid-liquid miscible mixtures can be separated through
a. chromatography
b. fractional distillation
c. filtration
d. both a and b
III. In fractional distillation, a large surface area for condensation is provided through
a. a thermometer
b. water bath
c. a fractionating column
d. reflux condenser
Organic Chemistry
IV. The two primary components of natural gas are
a. butane and hexane
b. ethane and propane
c. methane and ethane
d. pentane and butane
V. Which of the following mixtures are immiscible liquids
a. water and ethanol
b. toluen and ethanoic acid
c. benzene and benzoic acid
d. diethyl ether and hexane
5. a. Write the structural formula of the following organic compounds
i. 5-ethyl-2-methyl-3-heptyn-1-ol
ii. 4-methyl-2-hexanone
iii. 3,4-dipropyl-1,3-hexadien-5-yne
iv. 4-ethyl-5-methylcyclohexane
a. butane and hexane
b. ethane and propane
c. methane and ethane
d. pentane and butane
V. Which of the following mixtures are immiscible liquids
a. water and ethanol
b. toluen and ethanoic acid
c. benzene and benzoic acid
d. diethyl ether and hexane
5. a. Write the structural formula of the following organic compounds
i. 5-ethyl-2-methyl-3-heptyn-1-ol
ii. 4-methyl-2-hexanone
iii. 3,4-dipropyl-1,3-hexadien-5-yne
iv. 4-ethyl-5-methylcyclohexane
Organic Chemistry
Determine if the solution is unsaturated, saturated or supersaturated:
i) 45g of KNO3 in 50g of water at 50°C
ii) 10g of NaCl in 50g of water at 25°C
iii) 80g of K2CR2O7 in 100g of water at 90°
i) 45g of KNO3 in 50g of water at 50°C
ii) 10g of NaCl in 50g of water at 25°C
iii) 80g of K2CR2O7 in 100g of water at 90°
