Abstract. NERY, Alessandro Ranulfo Lima and BASSI, Adalberto Bono Maurizio Sacchi. A primeira lei da termodinâmica dos processos homogêneos. Quím. Educação. SOBRE A PRIMEIRA LEI DA TERMODINÂMICA. Ney Henrique Moreira e Adalberto Bono Maurizio Sacchi Bassi* Instituto de Química, Universidade. (10) Física e Química A – Primeira Lei da Termodinâmica. No description. by. Nathaly Rodrigues. on 13 November Comments (0). Please log in to add.

Author: Brarg Yorr
Country: Honduras
Language: English (Spanish)
Genre: Science
Published (Last): 20 July 2011
Pages: 469
PDF File Size: 1.6 Mb
ePub File Size: 13.28 Mb
ISBN: 317-5-31045-529-4
Downloads: 89992
Price: Free* [*Free Regsitration Required]
Uploader: Tur

When a heater is immersed in a beaker of water the systemthe capacity of the system to termodinamiva work increases because hot water can be used to do more work than the same amount of cold water. In chemistry, we encounter reactions that can be harnessed to provide heat and work, reactions that liberate energy which is squandered primeira lei da termodinamica to the detriment of the environment but which give products we require, and reactions that constitute the processes of life.

Send the link below via email termoxinamica IM Copy. The current definition of the calorie in terms of joules termodinanica. We shall see that one very useful aspect of thermodynamics is that a primeira lei da termodinamica can be measured indirectly by measuring others and then combining their values.

This chapter introduces some of the basic concepts of thermodynamics. Examples of intensive properties are temperature, mass density mass divided by volumeand pressure. The fundamental physical property in thermodynamics is work: An isolated system is a closed system that has neither mechanical nor thermal contact with its surroundings. primeira lei da termodinamica

The fact that a falling weight may stimulate thermal motion in the system is irrelevant to the primeira lei da termodinamica between heat and work: An exothermic process is a process that releases energy as heat into its surroundings. Experiments have shown that the energy of a system may be changed by means other than work itself. We also begin to unfold some of the power of thermodynamics by showing how to primeira lei da termodinamica relations between different properties of a system.

If matter cannot pass primeira lei da termodinamica the boundary the system is classified as closed. It may be a reaction vessel, an engine, an electrochemical cell, a biological cell, and so on. Creating downloadable prezi, be patient. When a system heats its surroundings, molecules of the system stimulate the thermal motion of the molecules in the surroundings Fig. For example, a chemical bond might break if a lot of energy becomes concentrated in it.

Primeira lei da termodinâmica

Joule, is defined as. The internal energy is the total kinetic and potential energy of the molecules in the system see Comment 1. In other words, it primeira lei da termodinamica a function of the properties that determine the current state of the system.

A firewall is blocking access to Prezi content. In molecular terms, heating is the transfer of energy that makes use of disorderly molecular motion. An example of doing work is the expansion of a gas that pushes out a piston and raises a weight.

The basic concepts For the purposes primeira lei da termodinamica physical chemistry, the universe is divided into two parts, the system and its surroundings. The system is the part of the world in which we have a special interest. Comments 0 Please log in to add your comment.

Primeira lei da termodinâmica – A primeira lei da termodinâmica do livro do Atkins

An intensive property is a property that is independent of the amount of substance in the sample. Cancel Reply 0 characters used from the allowed.

The release of energy can be used to provide heat when a fuel burns in a furnace, to produce mechanical work when a fuel burns in an engine, and to generate electrical work when a chemical reaction pumps electrons through a circuit. The energy of a system is its capacity to do work. An exothermic process in a similar primeira lei da termodinamica container results in a release of energy as heat into the surroundings. Do you really want to delete this prezi? Add a personal note: When a system does work it causes atoms or electrons in its surroundings to move in an organized way.

The surroundingscomprise the region outside the system and are where we make our measurements. Calories cal and kilocalories kcal are lfi encountered. The internal energy is an extensive property. Send link to edit primeira lei da termodinamica this prezi using Primeura Meeting learn more: Send the link below via email or IM.

Two examples of extensive properties are mass and volume. The distinction between work and heat is made in the surroundings. Joule, is defined as A joule is quite a small unit pgimeira energy: Primeira lei da termodinamica energy, heat, and work are all measured in the same units, the joule J.

Parte 1 de 15 The First Law This chapter introduces some of the basic concepts of thermodynamics. A molecule has a certain number of degrees of freedom, such as the ability to translate the motion of its centre of mass through spacerotate around its centre of mass, or vibrate as its bond lengths and primeira lei da termodinamica change.

When an endothermic process takes place in an adiabatic container, it results in a lowering of temperature of the system; an exothermic process results in a rise of temperature.

A primeira lei da termodinâmica dos processos homogêneos

Likewise, when work is done on a system, molecules in the surroundings are used to transfer energy to it in an organized way, as the atoms in a weight primeira lei da termodinamica lowered or a current of electrons is passed.

A chemical reaction that drives an electric current through a resistance also does work, because the same current could be driven through a motor and used to raise a weight. Thermodynamics, the study of primeira lei da termodinamica transformations of energy, enables us to discuss all these matters quantitatively and to make useful predictions.

Constrain to simple back and forward steps.