Question

Which of the following is a benefit of plastics?(1 point) Responses Synthetic materials, such as plastic, biodegrade very quickly. Synthetic materials, such as plastic, biodegrade very quickly. Plastics conduct electricity. Plastics conduct electricity. Plastics can all be recycled together. Plastics can all be recycled together. The thermal conductivity of plastic is very low. The thermal conductivity of plastic is very low. Remaining Attempts : 3

Answer 1

The correct benefit of plastics from the options provided is: The thermal conductivity of plastic is very low.

This low thermal conductivity makes plastics useful as insulators in various applications.

The other statements are not accurate benefits of plastics:

• Plastics do not biodegrade very quickly; in fact, they can take hundreds of years to break down.
• Not all plastics can be recycled together; recycling often requires sorting by type.
• While some plastics can conduct electricity, many are insulative and do not conduct electricity well.

Answer 2

What happens at 0o Kelvin? Select the best answer.(1 point) Responses Particle motion slows to a vibration, preventing particles from escaping forces of attraction. Particle motion slows to a vibration, preventing particles from escaping forces of attraction. Particles have enough kinetic energy to begin to move. Particles have enough kinetic energy to begin to move. A substance will lose both shape and volume. A substance will lose both shape and volume. At 0o K, or absolute zero, all particle motion stops. At 0 o K, or absolute zero, all particle motion stops. Remaining Attempts : 3

Answer 3

The best answer is: At 0° K, or absolute zero, all particle motion stops.

At absolute zero (0 Kelvin), it is theorized that the motion of particles would come to a complete halt, meaning there would be no thermal energy and thus no kinetic energy left in the particles. However, it should be noted that due to quantum mechanics, particles may retain some degree of zero-point energy and may not be completely motionless, but this is the most accurate statement among the options provided.

Answer 4

The boiling point of methanol is 64.7°C. Its melting point is –97.6°C. At room temperature (~25°C), methanol is in which state?(1 point) Responses gas gas intermediate between solid and liquid intermediate between solid and liquid intermediate between liquid and gas intermediate between liquid and gas liquid

Answer 5

At room temperature (~25°C), methanol is in the liquid state.

Since the boiling point of methanol is 64.7°C and its melting point is –97.6°C, at 25°C, methanol remains in a liquid state, as it is above the melting point and below the boiling point.

Answer 6

For an enclosed gas with a constant temperature, the pressure of the gas changes from 15 atm to 30 atm. What happens to the volume of the gas?(1 point) Responses The volume stays the same as its original value. The volume stays the same as its original value. The volume becomes two times the original value. The volume becomes two times the original value. The volume becomes half of its original value. The volume becomes half of its original value. The volume becomes 15 times the original value.

Answer 7

For an enclosed gas at constant temperature, the relationship between pressure and volume is described by Boyle's Law, which states that the pressure of a given mass of gas is inversely proportional to its volume when the temperature is held constant. This means that if the pressure increases, the volume must decrease.

In this case, the pressure of the gas changes from 15 atm to 30 atm, which is a doubling of the pressure (30 atm is two times 15 atm). Therefore, according to Boyle's Law, the volume will become half of its original value.

So, the correct response is: The volume becomes half of its original value.

Answer 8

Under which conditions will the volume of a gas be greatest?(1 point) Responses T = 300K and P = 2 atm T = 300K and P = 2 atm T = 273K and P = 0.25 atm T = 273K and P = 0.25 atm T = 300K and P = 0.25 atm T = 300K and P = 0.25 atm T = 273K and P = 2 atm T = 273K and P = 2 atm Remaining Attempts : 3

Answer 9

According to Boyle's Law, at a constant temperature, the volume of a gas is inversely proportional to its pressure. This means that lower pressure conditions will result in a greater volume of gas.

Additionally, increasing the temperature generally causes an increase in gas volume according to Charles's Law, since volume is directly proportional to temperature when pressure is held constant.

Now let's analyze the given options:

1. T = 300K and P = 2 atm
2. T = 273K and P = 0.25 atm
3. T = 300K and P = 0.25 atm
4. T = 273K and P = 2 atm

Among these:

• T = 300K and P = 0.25 atm has a higher temperature and lower pressure compared to the other conditions, which will lead to the greatest volume.

Thus, the correct response is: T = 300K and P = 0.25 atm.

Answer 10

Carbonated beverages contain dissolved carbon dioxide gas. Which temperatures are best for the liquid while it is being produced in the factory?(1 point) Responses Low temperatures are best to minimize the solubility. Low temperatures are best to minimize the solubility. High temperatures are best to minimize the solubility. High temperatures are best to minimize the solubility. High temperatures are best to maximize the solubility. High temperatures are best to maximize the solubility. Low temperatures are best to maximize the solubility.

Answer 11

The correct answer is: Low temperatures are best to maximize the solubility.

In general, the solubility of gases in liquids increases as the temperature decreases. Therefore, for carbonated beverages, lower temperatures during production help to dissolve more carbon dioxide gas in the liquid, maximizing its solubility. This is why carbonated beverages are often stored and handled at cooler temperatures to maintain the dissolved gas.