ME13.1 To prepare Ethene and examine its properties

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ME13.1 To prepare Ethene and examine its properties - Quiz 3

In the production reaction of ethene in the lab, which of the following is NOT used? *

1 point

Glass wool

Aluminium oxide

Bunsen flame

Acid catalyst

Upon reaction with ethene, what color does bromine water change to? *

1 point

Pink

Blue

Green

Colorless

How can you compare the combustion of ethene to that of ethyne? *

1 point

Ethene burns with less smoke

Ethene requires more oxygen to burn

Ethene has a higher temperature of combustion

Ethene burns with a green flame

What effect does ethene have on fruit? *

1 point

It slows down ripening

It speeds up ripening

It acts as a preservative

It is used to flavor fruit

The mass of calcium carbide consumed in the preparation of ethyne, in an apparatus like that shown above, was 3.2 g. The equation for the reaction is as follows:

CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂

Calculate the maximum theoretical number of ethyne molecules produced in this reaction.

1 point

4 x 10²²

5 x 10²²

3 x 10²²

7 x 10²²

Why was the first test tube of ethene collected generally discarded? *

1 point

It contains mostly air

It contains impurities

It has a high concentration of aluminium oxide

It did not contain any ethene

Which of the following best exemplifies a property of ethene related to its solubility? *

1 point

Soluble in polar solvents like water

Soluble in non-polar solvents like cyclohexane

Insoluble in organic solvents like methanol

Soluble in ionic solvents like sodium hydroxide

Why is ethene insoluble in water? *

1 point

Ethene is a non-conductive gas

Water's temperature is too low

Ethene forms bonds with water

Ethene is non-polar

What type of reaction with bromine allows it to add across the ethene's double bond? *

1 point

Precipitation reaction

Displacement reaction

Addition reaction

Combustion reaction

What is ethene primarily used as in the manufacturing industry? *

1 point

A solvent for laboratory experiments

A catalyst for chemical reactions

A final product in synthesis

A starting material for other materials

Upon combustion, what does ethene convert into? *

1 point

Carbon monoxide and hydrogen sulfide

Carbon dioxide and water

Hydrogen and helium

Oxygen and nitrogen

What is the color change observed in acidified potassium permanganate when it comes in contact with ethene? *

1 point

From purple to yellow

From brown to black

From purple to colourless

From colourless to green

Which product is formed when bromine adds across the double bond in ethene? *

1 point

1,2 dibromo ethane

Bromoform

1,2 dibromo ethene

Ethyne

Apart from suck-back, what is another common precaution that must be taken because of a potential risk of fire? *

1 point

Wetting the glass wool

Placing a litmus paper inside the apparatus

Adding ethanol slowly to the apparatus

Keeping collected gas away from the bunsen flame

What type of organic compound can ethene be used to make? *

1 point

Methanol

Lactic acid

Polythene

Acetic acid

What is a distinct flame property observed when ethene combusts? *

1 point

Luminous yellow flame

Deep red flame

Invisible flame

Orange spark

A student prepared ethene, starting with 2.9 cm³ of ethanol (density 0.8 g / cm³). Calculate the volume of ethene gas produced in 26% yield when measured at room temperature and pressure.

CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂

1 point

0.314L

0.687L

0.411L

0.254L

Which of the following personal protective equipment is NOT commonly recommended in an ethene production experiment? *

1 point

Eye protection

Gloves

Sound proof ear muffs

Tongs

How is ethene prepared in the lab from ethanol? *

1 point

By hydroxylation

By hydrogenation

By halogenation

By dehydration

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