88 Conservation of Mass

The following situations often occur. You opened the device to clean it. Returning the device to its original position, somehow there is one or two spare screws. Or you can see that the screws are missing from the original device. In either case, you know that something is wrong. Instead of using more or less material than the original, we recommend using the same amount of material as at the start.

By the end of the eighteenth century, chemists accepted the definition of elements. And it was considered impossible to break down into simple substances by ordinary chemical methods. It is also evident that the elements combine with one another to form more complex substances called compounds. The chemical and physical properties of these compounds are different from those of the elements they form. I doubt the details of these processes

In the 1790's, people began paying more attention to the quantitative analysis of chemical reactions. Accurate and repeatable measurement of reactive element quality and compound formation results in the formation of several basic rules. One of them is called the law and states that during the chemical reaction the total mass of the product must be equal to the total mass of the reactants. In other words, quality can not be created or destroyed during a chemical reaction, but it is always preserved.

For example, let's consider the reaction between silver nitrate and sodium chloride. These two compounds dissolve in water to form silver chloride and sodium nitrate. Because silver chloride is not soluble in water, it forms a solid that we can filter out. By evaporating the water, the generated sodium nitrate can be recovered. When 58.5 grams of sodium chloride is reacted with 169.9 grams of silver nitrate, we start with 228.4 grams of material. After the reaction was completed and the material was separated, we formed 143.4 grams of silver chloride and 85.0 grams of sodium nitrate so that the total mass of the product was 228.4 grams I found out. The total mass of the reactants is therefore equal to the total mass of the product, which is a proof of the conservation of mass.

According to conservation law of mass, the total mass of the product during the chemical reaction must be equal to the total mass of the reactants.

Law: An accurate and reproducible measurement of the reactive elements and the quality of the compounds they form can be developed, some basic laws can be developed.

Mass saving: In the process of chemical reaction, the country where the total mass of the product must be equal to the total mass of reactants

The law of conservation of mass indicates that the total mass present before the chemical reaction is the same as the total mass existing after the chemical reaction, that is, the mass is preserved. For his combustion experiments, Lavoisier developed a conservation law that he observed the quality of his original material - glass container, tin and air - mass of material produced - glass container, glass tin, Remaining air. Historically, this is a concept that scientists can not understand. If this law is right, will we be able to reduce big wood pieces to small ash piles? Trees are considerably heavier than ashes. From this observation, the scientists believe that the quality has disappeared, but the graph \ (\ PageIndex {1} \) indicates that word burning follows the law of mass protection. Scientists were not thinking about gases that play an important role in this reaction.

Let's talk about mass preservation law, mass conservation law only shows what it is like. Even if we change substances, we will not permit the creation of substances from the beginning or the destruction of substances to be eliminated. So, how does chemical reaction handling chemical reactions help? This is the scenario we are accustomed to using the conservation law of mass.