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There are two laws of chemical combination- the law of conservation of mass, and the law of constant proportion. Both these laws are discussed in detail in chapter 3, science class 9.
There is one important question related to the chemical reaction. Is there any change Ncert Book Of Class 10th Science Pdf Search in the total mass of the system when a chemical reaction takes place? According to the law of conservation of mass, mass can neither be created nor be destroyed. The same logic stands true for chemical reactions as well. Several experiments carried out by Lavoisier standardized this law. The law of chemical combination is based on another law- the law of constant proportion. This law was also the result of experiments conducted by Lavoisier and Joseph L.
According to the law of constant proportion, any compound is made by mixing two or more elements in a constant proportion, and this proportion does not change irrespective of the source of the compounds. For example, in water, the ratio of the mass of Hydrogen to the mass of Oxygen is The ratio of the mass is the same for water from different sources. This law is also known as the law of definite proportion. The law of constant proportion is explained thoroughly in Class 9 Science Chapter 3.
The issue that the scientist faced with the law of constant proportion is to provide a possible explanation for this. Eminent scientist John Dalton tried to provide an explanation and introduced the concept of atoms.
An atom is the smallest unit of matter. They are so small that thousands of them are stacked in your hair. The atom of one element is different from that of the other elements. Therefore, each of these atoms is depicted by different symbols. Dalton used different combinations of straight lines and circles for denoting various atoms.
However, the modern-day symbols consider the first or the first Ncert 10th Class Social Science Book In Hindi Pdf Free two letters of the element's name to denote an atom of the element. For example, Hydrogen is denoted by H and Oxygen by O.
In some cases, and the Latin names are also considered. For example, the Latin name of Potassium is Kalium, and it is denoted by K. A list of names of elements is shown in Atom and Molecules Class 9. Every atom has a definite mass, called the atomic mass unit. The atomic mass is the characteristic of the atom. The concept of atomic mass supports the law of constant proportion and the law of conservation of mass. However, atoms cannot exist freely in nature.
It interacts with the same or different atoms to form molecules. They can also form ions. These ions or molecules aggregate to form elements of compounds that we can see.
These concepts are covered in Ch 3 Science Class 9. A group of two or more atoms is joined together to form a molecule. A molecule can exist freely in Ncert Book Of Class 10th Science Pdf Library nature. For example, Hydrogen, Oxygen, Calcium molecules can exist freely in nature. Molecules can be created from the same atoms or different atoms.
If the molecules are made from the same kind of atoms, they are called molecules of elements. For example, Sodium and Potassium elements. Molecules can also be made from dissimilar atoms. When different atoms come together, they form a compound. The molecules made of different atoms are called molecules of compounds. Chapter India after Independence. Chapter 1: Resources.
Chapter 3: Mineral and Power Resources. Chapter 4: Agriculture. Chapter 5: Industries. Chapter 6: Human Resources.
Chapter 1: The Indian Constitution. Chapter 2: Understanding Secularism. Chapter 3: Why do we need a Parliament? Chapter 4: Understanding Laws. Chapter 5: Judiciary. Chapter 7: Understanding Marginalisation.
Chapter 8: Confronting Marginalisation. Chapter 9: Public Facilities. Chapter Law and Social Justice. Social Science is an important subject for Class 8 students. However, with the vast syllabus, young students are often confused about what and how to study.
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