Most Important Industrial Chemistry Quiz Test Online

Industrial Chemistry Quiz Test Online

Industrial Chemistry Test. 1

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1) Congo Red is prepared by coupling tetrazotised benzidine with two molecules of which compound?

Sulphanilic acid

Phenol

Naphthionic acid

m-diaminobenzene

The structure of Congo Red confirms that two molecules of naphthionic acid are coupled with the tetrazotised benzidine.

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2) The reaction by which monomers are converted into polymers is known as:

Isomerization

Polymerization

Esterification

Hydrolysis

This is the general term for the process of joining many small molecules (monomers) together to form a very large molecule (polymer).

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3) What is the defining characteristic of a condensation polymer?

Formation from monomers containing double bonds.

The product is always a thermoplastic polymer.

The repeating unit and monomer have the same formula.

Formation with the elimination of a small molecule.

This is the hallmark of condensation polymerization, where monomers join together by 'condensing out' a small molecule, such as water.

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4) A polymer synthesized from more than one kind of monomer is called a:

Thermoset

Homopolymer

Addition polymer

Copolymer

The prefix 'co-' indicates that it is formed from two or more different monomers working together.

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5) Azoic dyeing, also known as ingrain dyeing, is a method that involves:

Applying the dye after a chemical reduction process.

Immersing the fabric in a colloidal form of the dye.

Producing an insoluble azo dye within the fabric itself.

Using a metallic salt to bind the dye to the fabric.

In this process, the fabric is soaked in a coupling agent and then in a solution of a diazotized amine, forming the final dye 'in-grain' (inside the fabric).

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6) The primary chromophore in azo dyes is the:

Carbonyl group (>C=O)

-N=N- group

Quinoid structure

-NO₂ group

This diazo linkage (-N=N-) is the defining chromophore for the entire class of azo dyes.

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7) A polymer that softens on heating and becomes hard again on cooling is known as:

An elastomer

A thermosetting polymer

A homopolymer

A thermoplastic polymer

The prefix 'thermo-' refers to heat, and 'plastic' refers to its ability to be molded. These polymers can be repeatedly softened by heat and hardened by cooling.

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8) Which component in a dye is primarily responsible for its ability to bind to a fabric?

The solvent medium

The auxochrome group

The quinoid ring structure

The chromophore group

Auxochromes are functional groups that intensify color and also help the dye to fix onto the fabric by interacting with it.

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9) Which type of dye is applied to a fabric with the help of salts of aluminum or chromium, which form an insoluble complex?

Mordant Dyes

Vat Dyes

Direct Dyes

Disperse Dyes

Mordants are metallic salts that are applied to the fabric to form a coordination complex, which in turn binds the dye to the fabric.

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10) Which of the following is an example of a Nitro dye, containing the -NO₂ group as a chromophore?

Alizarin

Methyl Orange

Naphthol Yellow S

Indigo

The structure of Naphthol Yellow S clearly shows nitro groups attached to the naphthalene ring system.

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11) Vat dyes, such as Indigo, are applied to fabric in a special way. What is the key first step in the vat dyeing process?

Oxidizing the dye into a soluble, colored form.

Reducing the dye into a soluble, colorless form.

Treating the fabric first with a metallic salt.

Synthesizing the dye directly within the fabric fibers.

Vat dyes are insoluble, so they must be chemically reduced (often with sodium hydrosulphide) to a soluble, colorless form that can penetrate the fibers.

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12) Which of the following is a common use for PVC?

Imitation leather and corrugated roofing

Packing materials and cable insulation

Stockings and apparel

Fishing lines and brush bristles

PVC is a versatile and durable plastic used in a wide range of building and consumer products, including floor covering, roofing, and imitation leather.

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13) The polymerization of ethylene to form polyethylene is an example of what type of polymerization?

Condensation polymerization

Step-growth polymerization

Copolymerization

Addition polymerization

In this reaction, ethylene monomers add to each other in such a way that the polymer contains all the atoms of the monomer unit. The double bond breaks to form new single bonds.

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14) Bismarck Brown, used for dyeing wool and in boot polishes, belongs to which class of dyes based on its structure?

Indigo Dyes

Nitro Dyes

Triarylmethane Dyes

Azo Dyes

Bismarck Brown contains two azo groups (-N=N-) linking three aromatic rings, making it an azo dye.

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15) Nylon-6,6 is a polyamide formed by the condensation reaction between which two monomers?

Adipic acid and Hexamethylene diamine

Phenol and Formaldehyde

Ethylene glycol and Terephthalic acid

Vinyl chloride and Vinyl acetate

Nylon-6,6 derives its name from its two six-carbon monomers: adipic acid (a dicarboxylic acid) and hexamethylene diamine (a diamine).

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16) What is the color of the indicator phenolphthalein in a basic medium?

Yellow

Blue

Red

Colorless

In a basic solution, the structure of phenolphthalein changes to a quinoid form, which imparts a distinct red or pink color.

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17) During the addition polymerization of an alkene monomer, what happens to its double bond?

It stays unchanged within the polymer backbone.

It is eliminated from the chain as a small molecule.

Its pi bond breaks to form new sigma bonds.

It migrates to the terminal end of the polymer.

The electrons from the weaker pi bond are used to form the strong sigma bonds that constitute the polymer chain.

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18) Which of the following is a key characteristic of a thermosetting polymer?

It softens upon heating and can be remolded.

It hardens upon heating and cannot be softened.

It is made exclusively by addition polymerization.

It has weak forces between its polymer chains.

Heating causes extensive cross-linking between polymer chains, forming a rigid, infusible solid that cannot be softened by reheating.

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19) Polyvinyl chloride (PVC) is an addition polymer formed from the monomer vinyl chloride, which is synthesized from acetylene and HCl.

Trichloroethene

Chloromethane

Chloroethene

1,2-dichloroethane

Vinyl chloride consists of a two-carbon alkene (ethene) with one chlorine atom attached, making its IUPAC name chloroethene.

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20) Malachite Green is an example of a triarylmethane dye. What is the characteristic structural feature of this class?

Two azo groups linking multiple aromatic rings.

A core structure of anthraquinone.

A central carbon bonded to three aromatic rings.

A nitroso group on a naphthalene ring system.

This accurately describes the core structure of triarylmethane dyes, where a central carbon is bonded to three aromatic rings, one of which is in the quinoid form.

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The average score is 56%

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Industrial Chemistry Test. 2

1 / 20

1) Adhesives that are made from sources like vegetable matter, starch, or animal skin are classified as:

Contact adhesives

Thermosetting adhesives

Natural adhesives

Synthetic adhesives

These adhesives are derived from biological or inorganic mineral sources and are often referred to as bioadhesives.

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2) Which of the following dyes is also well-known as an acid-base indicator?

Malachite Green

Alizarin

Phenolphthalein

Indigo

Although classified as a triarylmethane dye, phenolphthalein is better known for its use as an acid-base indicator.

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3) Which of the following is NOT a characteristic of an addition polymer?

The polymer is formed in a step-wise manner.

The polymer's backbone consists of carbon atoms.

The monomer units contain double or triple bonds.

No molecule is eliminated during polymerization.

Addition polymerization is a chain-growth process. Step-growth is characteristic of condensation polymerization.

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4) An example of a natural adhesive derived from starch is:

Dextrin

Rubber cement

Super glue (cyanoacrylate)

Epoxy

Dextrin is a type of adhesive made from starch, which is a natural vegetable matter.

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5) Disperse dyes are primarily used for which type of fabric?

Cellulosic fibers like cotton.

Natural fibers like wool and silk.

Modern synthetic fabrics like nylon and polyester.

All types of fabrics equally.

Disperse dyes are used with modern synthetic fabrics such as nylon, orlon, polyester, and cellulose acetate.

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6) The para quinoid structure is the characteristic chromophore in which class of dyes?

Anthraquinone Dyes

Azo Dyes

Indigo Dyes

Nitro Dyes

The para quinoid chromophore is present in anthracene-type dyes, such as Alizarin.

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7) What is the primary function of an adhesive?

To act as a lubricant between two items.

To dissolve the surfaces of two items.

To adhere or bond two items together.

To provide a decorative coating.

This is the fundamental definition of an adhesive – a compound that adheres or bonds two items together.

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8) The monomers adipic acid and hexamethylene diamine each contain how many carbon atoms?

Both contain 6 carbon atoms.

Adipic acid has 2, hexamethylene diamine has 6.

Both contain 2 carbon atoms.

Adipic acid has 6, hexamethylene diamine has 2.

Nylon-6,6 derives its name from its two starting materials, both of which have six carbons.

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9) What is the function of an auxochrome like -OH or -NH₂ in a dye molecule?

To cause the dye molecules to polymerize.

To decrease solubility for wash resistance.

To increase solubility and help bind the dye.

To act as the primary chromophore for color.

The polar auxochrome makes the dye water-soluble and binds it to the fabric by interacting with oppositely charged groups.

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10) UV and light curing adhesives are composed of low or medium molecular weight:

Starches

Elastomers

Solvents

Resins

These adhesives consist essentially of low or medium molecular weight resins that polymerize upon exposure to light.

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11) Elastomers, thermoplastics, and thermosetting adhesives are all examples of what broad category of adhesives?

Hot melt adhesives

Drying adhesives

Natural adhesives

Synthetic adhesives

These are all classifications of adhesives created through chemical synthesis.

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12) What type of chemical bond is formed between the monomers in Nylon-6,6?

Ester bond

Ether bond

Carbon-carbon single bond

Amide bond

Nylon-6,6 is a polyamide, formed by the reaction between a carboxylic acid and an amine to create an amide linkage (-CONH-).

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13) The synthesis of vinyl chloride monomer can be achieved by reacting acetylene with which substance in the presence of HgCl₂?

CH₃Cl

HCl

H₂O

Cl₂

Vinyl chloride is obtained from acetylene by treatment with HCl in the presence of HgCl₂.

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14) How do drying adhesives, such as white glue and rubber cement, harden?

By the evaporation of their solvent.

By cooling down from a molten state.

By exposure to ultraviolet (UV) light.

By a chemical reaction between two components.

These adhesives consist of a polymer dissolved or suspended in a solvent. The bond forms as the solvent evaporates.

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15) Which type of adhesive is popular for crafts due to its ease of use with a wide range of materials?

UV curing adhesives

Natural bioadhesives

Hot melt adhesives

Two-part epoxies

Hot melt adhesives have become popular for crafts because of their ease of use and the wide range of common materials to which they can adhere.

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16) The term 'bioadhesives' often refers to which category of adhesives?

Hot melt adhesives

Natural adhesives

Drying adhesives

Synthetic adhesives

Natural adhesives derived from biological sources are often referred to as bioadhesives.

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17) A polymer made from a single type of monomer, such as polyethylene from ethylene, is called a:

Homopolymer

Copolymer

Thermoplastic

Condensation polymer

Polymers which are synthesized from only one kind of monomer are called homopolymers.

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18) What is the key application requirement for contact adhesives?

They only need to be applied to a single surface.

They must be applied while hot.

They must be mixed just before use.

They must be applied to both surfaces and dried before joining.

Contact adhesives form a bond upon contact after the solvent has evaporated from both coated surfaces.

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19) The preparation of Methyl Orange involves diazotising which compound first?

Dimethylaniline

p-nitroaniline

Benzidine

Sulphanilic acid

The synthesis of Methyl Orange starts with the diazotization of sulphanilic acid.

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20) Hot glue, which is applied with a glue gun, is an example of which type of adhesive?

A natural bioadhesive

A thermoplastic adhesive

A UV curing adhesive

A drying adhesive

Also known as hot melt adhesives, these are thermoplastics that are melted, applied, and then harden as they cool to room temperature.

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The average score is 63%

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Industrial Chemistry Test. 3

1 / 20

1) Direct dyes, like Martius Yellow, can be applied directly to fibers like wool and silk because:

their auxochromes interact with polar groups in the fiber.

they are chemically synthesized within the fiber itself.

they undergo a reduction-oxidation cycle.

they are insoluble and get trapped in the fibers.

A direct dye contains an acidic or basic auxochrome which combines with the opposite polar group present in the chemical structure of the fiber.

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2) The synthesis of phenolphthalein involves heating phthalic anhydride with two moles of what substance?

Aniline

Benzene

Benzoic acid

Phenol

Phenolphthalein is prepared by heating phthalic anhydride (1 mole) and phenol (two moles).

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3) An adhesive made from inorganic mineral sources would be classified as:

Thermoplastic

Synthetic

Thermosetting

Natural

Natural adhesives are made from inorganic mineral sources or biological sources.

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4) Which of the following is NOT a main type of dye when classified by structure according to the provided text?

Azo Dyes

Vat Dyes

Anthraquinone Dyes

Indigo Dyes

Azo, Anthraquinone, and Indigo dyes are all classifications by structure. Vat Dyes are a classification based on the method of application.

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5) The structure of Alizarin is based on which parent aromatic hydrocarbon?

Naphthalene

Phenanthrene

Anthracene

Benzene

Alizarin is a typical anthraquinone dye, which is an anthracene-type dye.

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6) Addition polymerization is also known as:

Ionic polymerization

Step-growth polymerization

Copolymerization

Chain-growth polymerization

Addition polymers are also referred to as Chain-Growth Polymers.

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7) The process of using a glue gun involves which type of adhesive?

Applying a contact adhesive

Applying a drying adhesive

Mixing a two-part thermosetting adhesive

Melting and applying a hot melt adhesive

The glue gun melts the solid hot melt adhesive and allows the liquid to pass through onto the material where it solidifies.

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8) Which of these is NOT a typical use for Nylon-6,6?

Filaments for fishing lines and ropes

Floor covering and gramophone records

Molded objects like gears and bearings

Fibers for clothing and carpeting

Nylon-6,6 is used for fibers, filaments, bristles, and molded objects. Floor covering and gramophone records are uses for PVC.

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9) The primary difference between a thermoplastic and a thermosetting polymer lies in their:

Monomer composition

Molecular weight

Behavior when heated

Solubility in water

A thermoplastic softens on heating, while a thermosetting polymer becomes hard on heating and cannot be softened again.

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10) What happens to the colorless, soluble form of Indigo ('Indigo White') when the dyed cloth is hung in the air?

It reacts with a mordant in the fabric.

It polymerizes on the fabric surface.

It is reduced back to the insoluble dye.

It is oxidized back to the insoluble, blue dye.

When the cloth is hung in air, the colorless compound is oxidized back to the insoluble colored dye.

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11) Which category of adhesives requires application to both surfaces before they are joined?

Natural adhesives

Hot glue adhesives

Drying adhesives

Contact adhesives

Contact adhesives must be applied to both surfaces and allowed some time to dry before the two surfaces are pushed together.

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12) Mordant Green 4 is a dye that contains which chromophore?

Nitroso group (-N=O)

Azo group (-N=N-)

Quinoid ring

Nitro group (-NO₂)

The -NO group is the chromophore in Nitroso dyes, and Mordant Green 4 is given as an example.

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13) Condensation polymerization is also known as:

Homopolymerization

Radical polymerization

Step-growth polymerization

Chain-growth polymerization

Condensation polymers are also referred to as step-growth polymers.

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14) Para Red was the first azo dye prepared. Its synthesis involves the reaction of diazotized p-nitroaniline with what coupling compound?

Aniline

Phenol

Dimethylaniline

β-naphthol

Para red is obtained by the reaction of diazotized p-nitroaniline with β-naphthol.

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15) White glue, a common household and school adhesive, belongs to which class?

Hot melt adhesive

Contact adhesive

UV curing adhesive

Drying adhesive

White glue and rubber cements are members of the drying adhesive family, which harden as their solvent evaporates.

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16) Which of these adhesive types works by a physical process rather than a chemical one?

Hot melt adhesive

UV curing adhesive

Two-part epoxy

Cyanoacrylate (Super Glue)

Hot melt adhesives are thermoplastics that are applied hot and simply harden as they cool, which is a physical change of state.

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17) The 'lake' formed during mordant dyeing is:

the reduced, colorless form of the dye.

a colloidal dispersion of the dye.

an insoluble complex of fiber, mordant, and dye.

a solution of the dye in water.

The mordant forms an insoluble coordination complex between the fiber and the dye, which appears in the form of lakes.

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18) The chemical stability of a dye, meaning it won't wash out with soap or fade in sunlight, is referred to as its:

Fastness

Affinity

Chromogenicity

Solubility

The dye must be 'fast' or chemically stable so that the color will not wash out with soap and water, or fade on exposure to sunlight.

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19) What is a major advantage of modern synthetic adhesives over many traditional natural adhesives?

They are always less expensive.

They are completely non-toxic.

They are more biodegradable.

They offer extremely high bond strength.

Some modern adhesives are extremely strong and are becoming increasingly important in modern construction and industry.

20 / 20

20) The color of Methyl Orange changes from yellow in base to red in acid due to:

a change in ionic structure.

a hydration reaction.

the breakdown of the azo bond.

the removal of the sulfonate group.

The change in color of Methyl Orange is due to the change in the structure of the ions.

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The average score is 30%

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Industrial Chemistry Test. 4

1 / 18

1) To create a thermosetting polymer, it is beneficial to use:

a monomer with three or more functional groups.

a pre-formed linear polymer.

a monomer with two functional groups.

a monomer with a carbon-carbon double bond.

To form a cross-linked network instead of linear chains, at least one of the monomers must have more than two functional groups to allow for branching. This leads to a thermoset structure.

2 / 18

2) An adhesive that is a thermoplastic applied in a molten state is known as a:

Natural adhesive

Drying adhesive

Contact adhesive

Hot melt adhesive

'Hot melt' adhesives are thermoplastics that are applied hot and allowed to harden as they cool.

3 / 18

3) Which of these is NOT a condensation polymer?

Nylon-6,6

Polyethylene terephthalate (a polyester)

Polyvinyl chloride (PVC)

Bakelite (phenol-formaldehyde resin)

PVC is formed by the addition polymerization of vinyl chloride monomers. Nylon and polyesters are explicitly mentioned as condensation polymers.

4 / 18

4) Which of the following is an example of a synthetic adhesive?

Animal hide glue

Elastomer-based adhesive

Starch-based glue

Dextrin

Elastomers, thermoplastics, and thermosetting adhesives are examples of synthetic adhesives.

5 / 18

5) What is the fundamental difference between homopolymers and copolymers?

Their thermal behavior when heated.

The number of different monomers used.

The reaction type used for polymerization.

Their final average molecular weight.

Homopolymers are synthesized from only one kind of monomer, whereas copolymers are prepared from more than one kind.

6 / 18

6) What is the structural formula of adipic acid, a monomer of Nylon-6,6?

HOOC-(CH₂)₄-COOH

CH₂=CH-COOH

H₂N-(CH₂)₆-NH₂

HOOC-COOH

Adipic acid is listed as a reactant for Nylon-6,6 with the formula HOOC(CH₂)₄COOH.

7 / 18

7) What is the key functional group that gives an auxochrome its ability to bind to a protein fiber like wool?

A central metal atom

An acidic or basic group

A long hydrocarbon chain

A carbon-carbon double bond

The polar auxochrome binds the dye to the fabric by interaction with the oppositely charged groups of the fiber structure, such as the -NH₂ group of wool.

8 / 18

8) The main purpose of a mordant in dyeing is to:

Dissolve the dye so it can penetrate the fabric.

Reduce the dye to a colorless form.

Intensify the color of the chromophore.

Act as a bridge to bind the dye to the fabric.

The mordant forms an insoluble coordination complex between the fiber and the dye and binds the two.

9 / 18

9) In the abbreviated formula for an addition polymer like polyethylene, -[CH₂-CH₂]-n, what does the 'n' represent?

The number of repeating monomer units.

The number of branches on the chain.

The number of carbons in the monomer.

The number of chains in the sample.

'n' is the degree of polymerization, indicating that the monomer unit in the brackets is repeated many times to form the long chain polymer.

10 / 18

10) The hardening of rubber cement is an example of which process?

Polymerization initiated by light

Cooling of a thermoplastic

Curing via a chemical reaction

Evaporation of a solvent

Rubber cement is a member of the drying adhesive family, which hardens as the solvent evaporates.

11 / 18

11) The reaction to form Nylon-6,6 eliminates a small molecule. What is this molecule?

Hydrogen gas (H₂)

Water (H₂O)

Methanol (CH₃OH)

Ammonia (NH₃)

Condensation polymers are formed with the elimination of simple molecules such as H₂O. The reaction image for Nylon-6,6 explicitly shows -H₂O.

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12) The key difference in the final structure of thermosetting polymers compared to thermoplastic polymers is the presence of:

Weak intermolecular forces.

Aromatic rings in the backbone.

Repeating amide linkages.

Extensive cross-links.

Thermosetting polymers become hard on heating and cannot be softened, which is due to the formation of a rigid, cross-linked 3D network structure.

13 / 18

13) The repeating unit in polyethylene is:

-CH₂-

-(CH₂-CH₂)-

-(CH₂-CHCl)-

-(CH₃-CH₃)-

The ethylene monomer (CH₂=CH₂) polymerizes to form the repeating unit -CH₂-CH₂-.

14 / 18

14) If you mix two different types of monomers, one with two acid groups and one with two alcohol groups, what type of polymer will you form?

A polyamide copolymer

An addition homopolymer

A polyethylene copolymer

A polyester copolymer

Polyesters are a main type of condensation polymer. The reaction between an acid and an alcohol forms an ester linkage. Since two different monomers are used, it will be a copolymer.

15 / 18

15) What is the structural formula of hexamethylene diamine, a monomer of Nylon-6,6?

HOOC-(CH₂)₄-COOH

H₂N-(CH₂)₆-NH₂

H₂N-(CH₂)₂-NH₂

C₆H₅-NH₂

Hexamethylene diamine is listed as a reactant for Nylon-6,6 with the formula H₂N(CH₂)₆NH₂.

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16) Which of these is NOT listed as a category of synthetic adhesives?

Elastomers

Thermoplastic adhesives

Thermosetting adhesives

Bioadhesives

Elastomers, thermoplastics, and thermosetting adhesives are listed as synthetic. Bioadhesives are referred to as natural adhesives.

17 / 18

17) The repeating unit in polyvinyl chloride is:

-(CH₂-CH₂)-

-(CHCl-CHCl)-

-(CH₂-CHCl)-

-(CCl₂-CH₂)-

The vinyl chloride monomer (CH₂=CHCl) polymerizes to form the repeating unit -CH₂-CH-Cl.

18 / 18

18) The process of forming polyethylene can be catalyzed by Ziegler catalysts, which consist of trialkyl aluminum and what other compound?

An organic peroxide

Sulfuric acid

Mercury(II) chloride

Titanium tetrachloride

Ziegler Catalysts consist of a trialkyl aluminum and titanium tetrachloride.

Your score is

The average score is 61%

Most Important Industrial Chemistry Quiz Test Online

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