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Symbols of Chemically Inactive Non-metals or Noble Gases
Sl. No Nobel Gas Symbol 1. Helium He 2. Neon Ne 3. Argon Ar 4. Krypton Kr 5. Xenon Xe 6. Radon Rn The names of the elements had originated from different sources in different ways. Some of them are discussed here. For exampl..
Enthalpy (H) and Enthalpy Change (DH)
>The sum of internal energy and PV energy of any system, under a particular set of conditions, is called enthalpy. It is denoted by H. Mathematically, it may be put as H = E + PV Some important features of enthalpy are: (i) It is a state function. (ii) It is also called heat content of the system. ..
>The sum of internal energy and PV energy of any system, under a particular set of conditions, is called enthalpy. It is denoted by H. Mathematically, it may be put as H = E + PV Some important features of enthalpy are: (i) It is a state function. (ii) It is also called heat content of the system. ..Framing of Formulae
We use alphabets like x, y, z etc., to denote variables. For example the length of a rectangle is denoted by 'l'. It takes different values in different rectangles. A formula is a relation between different variables formed using mathematical symbols. Any g..
Question 2
Question: What is the difference between symbol of an element and formula of an element? Answer: Symbol of an element represents the name of the element. It also represents one atom of the element. Example: H represents hydrogen and C represents carbon A for..
Framing of Formulae Summary
Summary - In a given sentence, the variables are replaced by letters and the different operations are replaced by their mathematical symbols. We now arrive at a formula. In a given sentence, the variables are replaced by letters and the different operations are replace..
Permutations
The different arrangements that can be made with a given number of things taking some or all of them at a time are called permutations. The symbol n P r or P(n,r) is used to denote the number of permutations of n things taken r at a tim..
Permutations
Permutations - The different arrangements that can be made with a given number of things taking some or all of them at a time are called permutations. The symbol n P r or P(n,r) is used to denote the number of permutations of n things taken r at a tim..
Permutations
The different arrangements that can be made with a given number of things taking some or all of them at a time are called permutations. The symbol n P r or P(n,r) is used to denote the number of permutations of n things taken r at a tim..
Molecules of Compounds
A molecule of a compound consists of two or more atoms of different elements joined together in a fixed ratio. Examples: CuSO 4 contains Cu - 1 atom, S - 1 atom, O - 4 atoms A chemical formula represents the composition of a molecule of the substance in terms of the symbol of th..
Determination of the empirical formula of a compound
The empirical formula of a compound is determined from the percentage composition of different elements and atomic masses of the elements. The various steps involved in determining the empirical formula are: The percentage of each element is divided by its atomic mass. This gives the r..
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