Thermochemistry, Heat and Temperature


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The heat we receive from the sun, is really a miracle, because we are not responsible for making sure that the sun rays does not give us as nations, all kinds of skin cancer.

In today’s article, we are going to talk about term Thermochemistry, heat and temperature; thermochemistry is the study of energy changes that are part of chemical and physical reactions. When heat goes through an exothermic process, which is a process that means that heat has been released, or when heat is absorbed or go through an absorption process, known as the endothermic process, then we’ll be able to see a chemical or physical reaction.

The set of substances that is converted by heat, are referred to as reactants, and the resulting substances of the chemical reaction are known as products. In the following balanced chemical reaction the reactants are gaseous methane, CH 4 (g), and gaseous molecular oxygen, O 2 (g), and the products are gaseous carbon dioxide, CO 2 (g), and liquid water H 2 O(l):

CH 4 (g) + 2 O 2 (g) → CO 2 (g) + 2 H 2 O(l).

The temperature and the pressure in which a chemical reaction takes place, will dictate how much heat a chemical reaction is associated with.

We see from this explanation that heat is very important in thermochemistry, let us discuss this term a bit to understand what role it plays in thermochemistry.

Heat can also be represented by the letter q; when thermal energy is transferred from a hotter system to a cooler one, when they come into contact, this process is known as convection. The measurement of the kinetic energy, which atoms and molecules in a system have, is known as temperature. As two related concepts, heat and temperature, are sometimes confused to be the same, but they do have different units, because heat has units of energy, Joules (J) and temperature has units of degrees Celsius or Kelvin (K).

The average kinetic energy of atoms or molecules, which form part of a system, can be measured through temperature. Temperature does not change, which means that the boiling point of water is always the same, no matter how much water is boiling.

The fact that temperature does not change, no matter how much of the substance exists in a chemical reaction, makes temperature an intensive property. A process quantity is also a term used to describe heat; because energy is transferred from a hotter object to a cooler one. For example, when a person picks up a cup of tea, if that person does not hold that cup carefully; then heat can be transferred from the cup to the person’s hands, and it will burn.

The molecules in that cup of coffee, are constantly in motion at the atomic level, and each time the molecules collide, kinetic energy is transferred. Through molecular collisions, from the hotter system to the cooler system, heat is transferred, when to systems are in contact.

Heat transfer occurs when two systems are in contact, because one is hotter then the other, and the two objects must reach the same temperature, until they are in thermal equilibrium.

As a branch of thermodynamics, a wide range of scientists and engineers utilize thermochemistry in their projects to create great things and change the world. Manufacturing plants are created by chemical engineers, by applying the principles of thermochemistry.

Thank you for reading this post!!!