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They are all artistically enhanced with visually stunning color, shadow and lighting effects. Many of them are also animated. Atoms and Molecules - Atoms and Molecules Atom is smallest particle that can be identified as a particular substance. Molecule is two or more atoms bonded to each other. PowerPoint PPT presentation free to view. C12H22O11 C. AgNO3 D. H2O Atom Smallest basic AP Chemistry Mrs Atoms and Molecules - Atoms are made of molecules. Molecules are made of atoms.
What is the smallest structure in this list that can be seen with an ordinary desk microscope? Atoms In our model of scale, remember that the BB represented an atom.
Hang the ignition tube in the flask by a thread and pot a cork on the flask. Find the mass of the flask on a balance.
Then tilt the flask. A chemical reaction takes place and sodium chloride and barium sulphate are formed. Then find the mass of the flask again. It will be seen that the sum of the masses of the reactants and products remain unchanged. BaCl2 solution BaSO4 white 3. Eg :- Water H2O always contains two elements hydrogen and oxygen combined together in the same ratio of or by mass. If 9 g of water is decomposed we get 1 g of hydrogen and 8 g of oxygen.
Ammonia NH3 always contains two elements nitrogen and hydrogen combined together in the same ratio of by mass. Atoms are very small in size and smaller than anything we can imagine or compare with. The radius of a molecule of water is m. The symbols of some elements are represented by one letter and the symbols of some elements are represented by two letters.
If the symbol has only one letter it should be written as capital letter and if the symbol has two letters then the first letter should be capital letter and the second letter should be small letter. So the mass of an atom is compared with the mass of a standard atom. The atom which is considered as a standard atom for comparing the masses of other atoms is carbon — 12 atom whose atomic mass is 12 u atomic mass unit.
A molecule is a group of two or more elements that are held together by attractive forces. Atoms of the same element or different elements can join together to form molecules.
Molecules of some elements contain only one atom and molecules of some elements contain two or more atoms. Atomicity of an element :- is the number of atoms present in one molecule of the element.
An ion is a charged particle having positive or negative charge. Valency :- is the combining capacity of an element. Molecular mass is expressed in atomic mass units u. The number of particles atoms present in 12g of Carbon — 12 is 6. This number is called Avagadro Number or Avagadro Constant. A mole represents two things :- i It represents a definite number of particles atoms, molecules or ions equal to 6. Gram atomic mass of an element :- is its atomic mass expressed in grams.
Gram molecular mass of a compound :- is its molecular mass expressed in grams. Relationship between number of moles n , mass m , molar mass M , Number of atoms or molecules N , and Avagadro number NO. Shanika Singla Jan. B Ram Jan. AdRanganath Jan. Show More. Total views. You just clipped your first slide!
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