The following describes characteristic of natural rubber, EXCEPT one.

It is resistant to chemicals and temperature variations.

It is derived from the latex sap of rubber trees.

It can be vulcanized to improve its strength and durability.

It softens and becomes moldable when heated.

In the modern age, humans depend a lot on synthetic polymers and cannot live without them. This is because of the properties of synthetic polymers that are various, long-lasting, light, can be mould and shaped easily. What do you mean by the word "various"?

They exhibit a wide range of properties and characteristics.

They are resistant to heat and chemicals.

They are primarily derived from natural resources.

In the rubber industry, formic acid is added to latex to_____

accelerate the coagulation of latex

slow down the coagulation of latex

Which of the following is the property of synthetic rubber?

Resistant to chemicals and temperature variations

Resistant to paint and moisture

Although synthetic polymers produce many adverse effects on the environment, we can still use them wisely. This is because the problem does not lie with the synthetic polymers but the irresponsible attitudes of human beings. What does the line "IRRESPONSIBLE ATTITUDES OF HUMAN BEINGS? mean?

Failure to recycle synthetic polymers

Lack of knowledge about synthetic polymers

Limited availability of synthetic polymers

Health benefits of synthetic polymers

Which of the following statements best describes the differences between the energy diagrams of exothermic and endothermic reactions?

In an exothermic reaction, the energy of the products is lower than the energy of the reactants, whereas in an endothermic reaction, the energy of the products is higher than the energy of the reactants.

In an exothermic reaction, the energy of the products is higher than the energy of the reactants, whereas in an endothermic reaction, the energy of the reactants is higher than the energy of the products.

Both exothermic and endothermic reactions have energy diagrams where the energy of the reactants is equal to the energy of the products.

Exothermic reactions always have a higher activation energy compared to endothermic reactions.

ESSAY: 10 POINTS According to the news report from Bernama on April 2020, the Deputy Minister of Plantation Industries and Commodities, Willie Mongin said, Malaysia being the largest latex glove producer in the world, is expecting the total report for this year to be 225 billion units with the value of more than RM20 billion. He said that this is due to Malaysia being the main producer of latex gloves to the health sector that was currently facing the critical situation following the CoVid-19 pandemic. Are latex gloves made from natural rubber or synthetic rubber? (Write your answer at the back part of the answer sheet.) Descriptions: This is how you will be graded. Excellent (10) : Demonstrates a thorough understanding of the controversial impact, provides a clear solution, and writes clearly and correctly. Good (8) : Shows a good understanding with minor errors, gives a relevant solution, and is mostly clear and correct. Satisfactory (6) : Shows basic understanding but with some errors, provides a solution, and has some clarity and grammar issues. Needs Improvement (4) : Shows limited understanding, lacks a clear solution, and has significant clarity and grammar issues.

Latex gloves can be made from both natural rubber and synthetic rubber. However, the term "latex gloves" commonly refers to gloves made from natural rubber latex. Natural rubber latex is derived from the sap of rubber trees, primarily grown in countries like Malaysia, which is the largest producer of latex gloves in the world. These gloves are known for their excellent elasticity, comfort, and barrier protection, making them ideal for the health sector, especially during critical situations like the COVID-19 pandemic. Synthetic rubber gloves, such as those made from nitrile or vinyl, are also used but are typically referred to by their specific material names rather than "latex gloves."

Through continuous research and development, how do scientists produce synthetic polymers?

by mimicking the structure of the monomers from the natural polymers

By extracting them from natural resources

By condensing minerals and metals

Which of the following statements correctly describes the differences between thermoplastic, thermoset, and elastomer materials?

Thermoplastics can be repeatedly softened by heating and hardened by cooling. Thermosets harden irreversibly when cured, while elastomers exhibit elastic properties and return to their original shape after deformation.

Thermoplastics are rigid and do not soften with heating, while thermosets can be reshaped when heated. Elastomers are flexible and return to their original shape after deformation.

Thermoplastics are highly resistant to chemicals and heat variations, whereas thermosets are derived from natural resources. Elastomers are synthetic materials used in footwear manufacturing.

Thermoplastics are liquid at room temperature and solidify upon cooling. Thermosets are lightweight metals used in aerospace applications. Elastomers are rigid materials used in construction.

CHEMISTRY MIDTERM EXAM Quiz

31 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What do you call to a long-chain molecule made from a combination of many small repeating units called as monomers?

Rubber

Polymer

Latex

Synthetic Rubber

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

SYNTHETIC POLYMERS: What does the word "synthetic" mean?

naturally occuring

composed of natural materials

Man-made or artificially created

Biodegradable and environmentally friendly

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the term to describe synthetic polymer?

rubber

metal

plastic

paper

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Thermoplastic is a plastic that can be _____

melted and recast many times

hammered into thin wires

coiled

stretched

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

TRUE OR FALSE: Synthetic polymers are very stable. They do not corrode or decay easily.

TRUE

FALSE

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

TRUE OR FALSE: Condensation and polymerisation involves a combination of THE SAME types of monomers.

TRUE

FALSE

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following correctly defines "elastic"?

Able to resist any change in shape or size.

Able to return to its original shape or size after being stretched or compressed.

Unable to adapt or change in response to different conditions.

Constant and unchanging regardless of external forces.

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CHEMISTRY MIDTERM EXAM

What do you call to a long-chain molecule made from a combination of many small repeating units called as monomers?

SYNTHETIC POLYMERS: What does the word "synthetic" mean?

What is the term to describe synthetic polymer?

Thermoplastic is a plastic that can be _____

TRUE OR FALSE: Synthetic polymers are very stable. They do not corrode or decay easily.

TRUE OR FALSE: Condensation and polymerisation involves a combination of THE SAME types of monomers.

Which of the following correctly defines "elastic"?

Which of the following plastic that can be cast once because there are cross-links that are sturdy between its polymers.

What do you call the polymer that has elastic polymer like rubber?

The following are properties of Synthetic polymer, EXCEPT.

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