Build an Atom / Element / Ion
This is an interactive activity.
As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron.
This is an interactive activity.
As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron.
Science – Text Book for Class IX Page No. – 32 Q. In a reaction, 5.3 gm of sodium carbonate reacted with 6 gm of ethanoic acid. The products were 2.2 gm of carbon dioxide, 0.9 gm water and 8.2 gm sodium ethanoate. Show that these observations are in agreement with the law of conservation …
ATOMS AND MOLECULES – NCERT TEXT BOOK Questions Solutions Read More »
The compounds which are formed by ions are called ionic compounds. In general, cations are made by metals and anions are made by non-metals. So, it can be understood as compounds made by metals and non-metals are ionic compounds. Examples – Al2(SO4)3, CaCl2, K2SO4, KNO3, CaCO3, NaCl, MgCl2 etc. Read more – Law of Conservation of …
Rules for writing a chemical formula Write down the symbols of the ions (cation and anion) involved. Write the symbol of cation first (L.H.S) followed by the symbol of anion (R.H.S.). Write the valency of each ion. Interchange the valencies of the ions and write as the subscript. Write them close together and ignore ‘1’ …
How do you Write Chemical Formula for an Ionic Compound? Read More »
Chemical formula is a symbolic representation of a molecule’s composition. It indicates – (a) the elements that are present in the compound and (b) the ratio of these elements in the compound. A chemical formula is also called molecular formula. The symbols in the molecular formula tell us about the elements and the subscript tells …
RULES FOR WRITING A CHEMICAL FORMULA OF SIMPLE COMPOUNDS Read More »
Formulas in brief – Mass = Molar mass x Number of moles Number of moles = Given number of particles / Avogadro number Number of particles = (Given mass / molar mass) x Avogadro number (from 1 and 2) If one carbon atom has a mass of 12 atomic mass units and one magnesium atom has …
Problems / Numericals based on Mole Concept (Atomic Mass/ Molar Mass/ Avogadro number) Read More »
Introduction The structure of matter can be one of the following – atoms → molecules → bulk compound or element atoms → bulk element atoms → ions → bulk ionic compound It clearly shows that the masses that are measured in the laboratory are masses corresponding to large numbers of tiny atoms or molecules. Logically …
What is Mole Concept? – Introduction, Importance and Formulae Read More »
Read first – Atoms – Its Symbols Atoms – Atomic Mass What is an atom? As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron. Protons and neutrons make up the nucleus of the atom, a dense and positively …
SKILLS TO DEVELOP Write and interpret symbols that depict the atomic number, mass number, and charge of an atom or ion. What is an atom? Quiz – Build an Atom / Element / Ion As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: …
Table of content – Summary Introduction Laws of Chemical Combination FAQs
Every element has a definite capacity to combine with other elements. The combining capacity of an element is called its valency.” In normal course, hydrogen has 1, oxygen has 2, nitrogen has 3 and carbon has 4 valency. This will depend upon the nature of the element. Read First – Ions – Cations and …
Simple ions – The ions which are formed from single atom carrying a positive or negative charge are called simple ions or mono-atomic ions. Example – Na+, Cl–, O-2, Al+3, N-3(nitride), Mg+2, Ca+2, Cu+2, Fe+2etc. Polyatomic ions -Polyatomic ions or compound ions are molecules formed from groups of atoms bonded together that carry a positive …
Atoms are neutral; they contain the same number of protons (positive particles) and electrons (negative particles). When the numbers of these subatomic particles are not equal, the atom is electrically charged and is called an ion i.e. ions are electrically charged atoms with extra electrons or missing electrons. It means ions are formed when atoms lose or gain …
How do atoms exist? Atoms of elements exist in nature either in uncombined form or in combined form. (a) The atoms of some elements called the noble-gas elements (helium, neon, argon, krypton, xenon) are normally found in nature as isolated (single) atoms as they are chemically unreactive. (b) The atoms of most elements are chemically …
Read first – The Atom – Its Size Atom – Its symbols Atomic mass of an element (1) The mass of an atom is related to the number of protons, electrons, and neutrons it has. Atom of an element is extremely small and therefore it is not easy to weigh it. Even that, it is …
Table of content – Reasons for Dalton’s atomic theory Dalton’s Atomic Theory Drawbacks of Dalton’s theory Importance of Dalton’s theory Frequently asked questions Important to learn – Law of Conservation of Mass Law of Definite Proportions / Constant Composition Mole Concept – Importance and formulas John Dalton FRS (6 September 1766 – 27 July 1844) John …
Read first – What is Matter? What is its Characteristics? States of Matter Law of Conservation of Mass Problems based on Law of Conservation of Mass Law of Definite Proportions / Constant Composition Mole Concept – Importance and formulas Problem 1 : One mole of V2O5 contains 5 moles of oxygen atoms, as it is clear from …
How to solve Problems based on Law of Definite Proportions / Constant Composition Read More »
Table of Content – What is law of definite proportions / constant composition ? Examples Importance of law of definite proportions Limitations of law of definite proportions Problems based on law of definite proportions/ constant composition Frequently asked Questions What is Matter? What is its Characteristics? States of Matter Law of Conservation of Mass Problems …
What is Law of Definite Proportions / Constant Composition? Read More »
Problem : 1 4 grams of hydrogen reacts with some oxygen to make 36 grams of water. Figure out how much oxygen must have been used by applying the law of conservation of mass? Solution: Word equation – Hydrogen + Oxygen → water Masses of each substance given – …
Table of Content – What is Law of Conservation of Mass? Examples Experimental verification of Law of conservation of mass Problems based on Law of Conservation of Mass Frequently Asked Questions – FAQs Test your understanding – Quiz Read more – What is matter? What is its Characteristics? States of matter Mole Concept – Importance …
What is Law of Conservation of Mass? – Examples and Problems Read More »