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Thermodynamics and Statistical Mechanics

Thermodynamics is the study of energy conversion between heat and mechanical work which leads to the macroscopic properties such as temperature, volume, and pressure. Statistical mechanics is the application of probability theory to study the thermodynamic behavior of systems of a large number of particles.

1,125 Questions

What is the specific heat of benzene if 3450J of heat is added to 150.0 g sample of benzene and its temperature increases from 22.5 degrees celsius to 35.8 degrees celsius?

The specific heat of benzene is 1.75 J/g°C. You can use the formula q = mcΔT, where q is the heat added, m is the mass of benzene, c is the specific heat, and ΔT is the change in temperature. Plug in the values and solve for c.

Is it true that the Law of Thermodynamics says that the oldest layer of sediment will be found beneath younger layers of sediments?

No, the Law of Thermodynamics does not pertain to the arrangement of sediment layers. The principle you are referring to is known as the Law of Superposition in geology, which states that in undisturbed layers of rock, the oldest layers are found at the bottom and the youngest at the top.

Calculate delta E for the system in which a gas absorbs 31 J of heat and does 18 J of work on the surroundings?

The change in internal energy (( \Delta E )) of the system can be calculated using the First Law of Thermodynamics, which states that ( \Delta E = Q - W ), where Q is heat added to the system and W is the work done by the system.

Given that the gas absorbs 31 J of heat (( Q = 31 J )) and does 18 J of work on the surroundings (( W = -18 J ) since work done by the system is negative), the change in internal energy would be ( \Delta E = 31 J - (-18 J) = 49 J ).

Therefore, ( \Delta E = 49 J ) for the system.

Can a dryer cause a phase change?

No, a dryer cannot cause a phase change. A dryer operates by using heat and airflow to evaporate moisture from clothing, but it does not have the ability to induce a phase change such as solid to liquid or liquid to gas.

What does thermodynamics mean?

Thermodynamics is the branch of science that deals with the relationships between heat, work, and energy. It describes how energy is transferred and transformed in physical systems, including the study of heat and temperature changes.

Does co generation violate the second law of thermodynamics?

No. Co-generation just increases the overall efficiency.

In normal central heating systems a large quantity of heat is lost in the exhaust gas. The flame heats an exchanger which warms the air circulating through the furnace.

In a co-generating plant the flame heats a sink on a thermal-electric device (usually a sterling driven generator). The "cold" side of the device is then cooled by the air circulating through the device.

Why does the temperature of water increase briefly when ice is added?

I suppose the temperature would increase very briefly depending on how violently the ice was added. Carefully and slowly adding ice to water in order to minimize the water's displacement would, by definition, add kinetic energy to the localized water, but probably not enough to heat the water up. That kinetic energy would go towards breaking more bonds from the ice. However if you propelled the ice really fast into the water, one can only assume that the instantaneous increase of kinetic energy gained by the water would be greater than the kinetic energy being used to melt the ice, therefore (briefly) increasing the temperature.

What is ZFC-FC?

Zero Field Cooling - Field Cooling

Measuring an effect from a field in the two following ways:

ZFC- Applying the field at a relatively low temperature compared to a characteristic temperature and continuously measuring the effects of the field as you raise the temperature to a level well above the characteristic level.

FC - Applying the field at a relatively high temperature compared to a characteristic temperature and continuously measuring the effects of the field as you lower the temperature to a level well below the characteristic level.

FC can be thought of as the reverse process to ZFC. If the effect you're measuring doesn't reverse using ZFC-FC, then you have something interesting on your hands.

Why and where did classical mechanics fail to explain blackbody radiation?

Blackbody radiation had been classically treated as cavity radiation, ie. radiation confined within a certain geometrical space. Therefore, the radiating EM waves are treated as standing waves having modes of zero electric field at the walls. Classically, as more and more energy is distributed into the cavity, the wavelengths of the EM waves get shorter and shorter, thereby allowing more and more modes to be possible, all of which have the same chance to be produced. So, the number of modes is proportional to energy which is inversely proportional to wavelength meaning it's directly proportional to frequency.

What all that boils down to, if classical mechanics had been right, is that as continually higher and higher frequencies of EM radiation are distributed into the blackbody, the amount of radiated energy should also continually increase. Experimental data, however, showed that the EM radiation, after a certain point, actually began to decrease, despite the continual increase in the energy put in.

That unexpected event was inexplicable using classical mechanics. The only way that it was eventually understood was by treating EM waves as discrete quanta of energy.

Who is a famous scientist who studies thermodynamics?

One famous scientist who studied thermodynamics is Ludwig Boltzmann. He made significant contributions to the field, including the development of statistical mechanics and the formulation of the famous Boltzmann equation. His work laid the foundation for our understanding of the behavior of gases and the concept of entropy.

Does a kerosene heater convert chemical energy to heat?

Yes, a kerosene heater works by burning kerosene, which releases energy in the form of heat through a combustion process. This process involves converting the chemical energy stored in kerosene into heat energy that warms up the surrounding area.

What branch of science does thermodynamic fall under?

Thermodynamics falls under the branch of physical science. It is the study of the relationship between heat, energy, and work.

Can aluminum foil transfer heat energy to fan and make it work?

No, aluminum foil cannot transfer heat energy to a fan to make it work. The fan operates using electricity to power its motor, which in turn generates airflow. Heat transfer does not influence the operation of an electric fan.

What is the chemical formula for Greiss reagent?

1% Sulfanilamide 0.1% N-1-Naphthyl-ethylenediamine dihydrochloride 5% Phosphoric acid Made up with pure water

What are the three basic electrical quantities?

It sounds like you are asking about current, voltage, and resistance - which are related by Ohms law. There are, however other electrical quantities such as charge, inductance and capacitance.

What is special about the entropy in thermodynamic equilibrium compared to all statesof a system?

In thermodynamic equilibrium, the system's entropy is maximized, reaching a state of maximum disorder or randomness. This is unique compared to other states of the system where entropy may be increasing or decreasing as the system approaches equilibrium. At equilibrium, the system has reached a stable condition where the distribution of energy and molecules is uniform, making it a distinct state in terms of entropy.

Why does the entropy of an isolated system never decrease?

This is just another way of saying that there are irreversible processes. The "why" is a little difficult to answer - it has simply been found BY EXPERIENCE, that there is a quantity, known as entropy, that doesn't decrease - and that this can help to explain WHY many processes are irreversible.

What is path function in thermodynamics?

A path function in thermodynamics is a function whose value depends on the path taken to reach a particular state. Examples include work and heat. These functions are not solely determined by the initial and final states but also by the process followed.

What is the value of a Thermodynamic Systems 357 revolver with a 4 inch barrel?

The value of a Thermodynamic Systems 357 revolver with a 4-inch barrel can vary depending on its condition, any modifications or accessories included, and current market demand. Generally, they can range from $300 to $700. It is recommended to check with local gun shops or online firearm marketplaces for a more accurate estimate.

Which temperatures are identical on the phase diagram?

Freezing-Melting,

And

Boiling-Condensation

You will also get the same temperature at the triple point at 273.16 K (0.01 °C) and 0.611657 kPa (0.00603659 atm) and along the sublimation-preciptiation/condensation line below the triple point.

Can the second law of thermodynamics be applied to anything other than food?

The Second Law of Thermodynamics applies to all processes in our Universe. It is not restricted specifically to food. In any process, the amount of unusable energy will increase. In extreme cases it might remain unchanged, but this is rather unlikely, since this implies 100% efficiency.

What does mathematics have to do with thermodynamics?

Thermo - means heat

dynamics - implies movement.

Thermodynamics at its simplest is the study of the movement of energy and in particular heat energy. It is actually a mathematical subject and usually involves calculations and hence mathematics. There is actually not a huge amount of chemistry.

Why is a roller coaster not in the first law of thermodynamics?

Actually it is. The first law of thermodynamics tells us that you have to put energy into the roller coaster (in this case in the form of work) to get it to the top of the first hill; getting it to the top increases its potential energy. Once it starts moving down, most of that potential energy is converted to kinetic energy as it moves around the track. Over the course of its circuit of the track, energy is continuously converted back and forth between potential and kinetic energy - with some energy also being converted to heat through friction with the rails and with the air. Energy is conserved - thus we see the first law obeyed.

Different ways to state the first law of thermodynamics?

The first law of thermodynamics states that energy cannot be created or destroyed, but only transferred or converted from one form to another. It can also be expressed as the principle of conservation of energy, where the total energy within a closed system remains constant over time.

How do the first and second Laws of Thermodynamics relate to cellular metabolism?

Quite simply, just like anything else, cells need energy to work. The energy can't be created out of nothing (First Law), and usable energy gets converted to unusable energy, therefore new energy sources must be found (Second Law).