FREE CHEMISTRY AND STUDY GAMES ABOUT ALCOHOLS

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FREE CHEMISTRY AND STUDY GAMES ABOUT ALCOHOLS

EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -28 Questions and Answers -format set of multiple-choice -Expert- Explanation

Question 1: What is a dehydration of an alcohol reaction?

Answer:

One where water is eliminated from an alcohol

Question 2: What is observed when Fehling's solution is added to aldehydes?

Answer:

Orange precipitate

Question 3: What are the physical properties of alcohols?

Answer:

Relatively high mp and bp, miscible with water

Question 4: What are the two methods for production of ethanol?

Answer:

Fermentation of glucose, hydration of ethene

Question 5: Which chemical tests can distinguish between aldehydes and ketones?

Answer:

Tollens's reagent or Fehling's solution

Question 6: What is an alcohol?

Answer:

An organic compound with an -OH group

Question 7: Give three disadvantages of production of ethanol from ethene

Answer:

High technology, Non-renewable source, Expensive equipment

Question 8: What is an oxidation reaction in organic chemistry?

Answer:

A reaction where oxygen is added or hydrogen is removed from a compound

Question 9: What reagent is used for the oxidation of alcohols?

Answer:

Acidified potassium dichromate

Question 10: What conditions are necessary for the fermentation of glucose?

Answer:

Compromise temperature of 35°C, enzymes, sealed vessel

Question 11: What conditions are necessary for dehydration of an alcohol

Answer:

Conc. phosphoric/sulphuric acid catalyst, heat and reflux

Question 12: Give two advantages of production of ethanol from ethene

Answer:

Fast reaction, Pure product, Continuous process, Low on manpower, High yield, alcohol

Question 13: What can secondary alcohols be oxidized to?

Answer:

Ketones

Question 14: Give two advantages of production of ethanol from glucose

Answer:

Low tech required, renewable, potentially carbon neutral

Question 15: Explain the physical properties of alcohols

Answer:

OH group leads to hydrogen bonding

Question 16: Draw the structure of the first three alcohols

Answer:

Methanol, ethanol and propanol

Question 17: Which experimental method is used to convert alcohols to aldehyde

Answer:

Distillation

Question 18: What can tertiary alcohols be oxidized to?

Answer:

Nothing

Question 19: What is the advantage of dehydrating alcohols to form alkenes?

Answer:

Alkenes can be used as chemical feedstock without using crude oil

Question 20: How is oxidation symbolized in an equation?

Answer:

[O]

Question 21: What is observed when Tollens' reagent is added to aldehydes?

Answer:

Silver mirror Question 22: Which experimental method is used to convert alcohols to carboxylic acids?

Answer:

Reflux

Question 23: What are the conditions for the production of ethanol from ethene?

Answer:

Heat, sulphuric acid catalyst, water

Question 24: What can primary alcohols be oxidized to?

Answer:

Aldehydes and carboxylic acids

Question 25: What is the product of a dehydration of an alcohol reaction

Answer:

An alkene

Question 26: Give three disadvantages of production of ethanol from glucose

Answer:

Slow, Low yield, Significant land use, Has to be distilled, Labour intensive

Question 27: How is ethanol extracted after fermentation of glucose?

Answer:

Fractional distillation

Question 28: What colour change is observed in the oxidation of alcohols?

Answer:

Acidified potassium dichromate turns green from orange