## What is the first law of thermodynamics answer?

The first law of thermodynamics states that energy cannot be created or destroyed, but it can be transferred.

## What is the first law of thermodynamics in chemistry?

The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy. This means that heat energy cannot be created or destroyed.

What is the first law of thermodynamics give an example?

The first law of thermodynamics states that the total energy of a system remains constant, even if it is converted from one form to another. For example, kinetic energy—the energy that an object possesses when it moves—is converted to heat energy when a driver presses the brakes on the car to slow it down.

### What is the first law of thermodynamics also write its physical significance?

The first law of thermodynamics is a special form of the principle of conservation of energy. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed. Energy cannot be formed nor ruined.

### How do you calculate work done in the first law of thermodynamics?

Step 3: Calculate the work done on or by the system using the first law of thermodynamics equation: ΔU=Q−W Δ U = Q − W , where work done by the system is W . If the final value for work is positive, then work is done by the system. If the final value for work is negative, then work is done on the system.

Which formula can be used to solve problems related to the first law of thermodynamics?

Answer: “Q = ΔU + W” is the equation is used to solve the questions related to “First law of thermodynamics”.

#### What is thermodynamics in physical chemistry?

Thermodynamics is the study of the relations between heat, work, temperature, and energy. The laws of thermodynamics describe how the energy in a system changes and whether the system can perform useful work on its surroundings.

#### How is the first law of thermodynamics expressed mathematically?

The first law of thermodynamics is given as ΔE=q+w, where ΔE is the change in internal energy of a system, q is the net heat transfer (the sum of all heat transfer into and out of the system), and w is the net work done (the sum of all work done on or by the system).

What is the limitations of 1st law of thermodynamics?

The limitation of the first law of thermodynamics is that it does not say anything about the direction of flow of heat. It does not say anything whether the process is a spontaneous process or not. The reverse process is not possible. In actual practice, the heat doesn’t convert completely into work.

## Why first law of thermodynamics is different in physics and chemistry?

Fundamentally, thermodynamics in physics and chemistry is the same. The only difference is the notation of work in both, with work done by the system taken as positive in physics, and work done on the system taken as positive in chemistry.

## What is the formula of work in thermodynamics?

Because pressure is constant, the work done is PΔV . Recall that the formula for work is W=Fd. We can rearrange the definition of pressure, P=FA, to get an expression for force in terms of pressure.

What is Q in internal energy?

Here Δ U \Delta U ΔU is the change in internal energy U of the system. Q is the net heat transferred into the system—that is, Q is the sum of all heat transfer into and out of the system. W is the net work done on the system.

### What is the first law of thermodynamics Class 11 chemistry?

The first law of thermodynamics states that the net heat energy supplied to the system is equal to sum of change in internal energy of the system and work done by the system. Let d Q amount of heat be supplied to the system resulting in a change of internal energy by dU.

What is the significance of 1st law of thermodynamics?

It gives the relationship between heat and work. It is merely the law of conservation of energy generalised to include heat as a form of energy transfer. The energy of an isolated system remains constant.

#### Is thermodynamics important for JEE?

Thermodynamics is an essential chapter for JEE Advanced as well as JEE Mains. This chapter is important and available in both Chemistry and Physics. In Physics, this concept is more extensive and logical and covers many small topics.

#### Is work positive or negative?

If work is done on the system, its sign is positive. If work is done by the system, its sign is negative.

Why is work negative pressure?

The negative sign associated with PV work done indicates that the system loses energy. If the volume increases at constant pressure (ΔV > 0), the work done by the system is negative, indicating that a system has lost energy by performing work on its surroundings.