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# Formula and equations dr.surendran prambadath

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### Formula and equations dr.surendran prambadath

1. 1. Chemistry Inorganic Organic Physics Physical Biology AnalyticalScience Geology Bio Polymer Medicine Industrial Materials Nano Pharmacy
2. 2. Atom MoleculeIndivisible Can split in to componentsSmallest particle of an Smallest particle of aelement compoundIt may or may not exist It can exist in the freein the free state stateAtoms take part in During chemicalchemical reaction reaction molecules split in to atoms.
3. 3. Monovalent F-, Cl-, Br-, I-, NO3-, CN-, HCO3- , CH3COO-Acid radicalsDivalent Acid O2-, S2-, SO42-, CO32-, Cr2O72-, MnO42-, SiO32-, ZnO22-, SnO32- radicalsTrivalent Acid PO43-, [Fe(CN)6]3- radicals Tetravalent [Fe(CN)6]4-Acid radicals
4. 4. 1 Write down the symbols or formulae of two radicals (A & B) side by side, positive A on the left and negative B on the right side. A = Al B = Cl Al Cl2 Write their valences at the top Al3 Cl13 Cross the valences. Al3 Cl1 = AlCl34 Complex radicals are enclosed in brackets. (NH4)2SO4
5. 5. Molecular Formula of a compound is asymbolic representation of a moleculeof the compound.Molecular Formula Indicates;a) Actual number of atoms of the elements in a molecule of the compound.b) The molar mass of the substance.
6. 6. Molecular Formula of Water is H2OThis indicates one molecule ofwater contains two hydrogen atomsand one oxygen atom.Molar mass of H2O is , 1x2 + 16 = 18 g mole-1
7. 7. Calculate the Molecular weight from the molecular formulaeCaCO3 40+12+16x3 = 100H2SO4 1x2+32+16x4 = 98CuSO4 63.5+32+16x4 =CuSO4.5H2O 63.5+32+16x4+18x5 =H 2 C 2 O4 1x2+12x2+16x4 =Na2CO3 23x2+12+16x3 =FeSO4 55.8+32+16x4 =KOHNaOH 23+16+1 =HCl 1+35.6 =CaCO3 40+12+16x3 +HNO3 1+14+16x3 =(NH4)2CO3 (14+1x4)x2+12+16x3 =C12H22O11 12x12+1x22+16x11 =
8. 8. A chemical equation is a methodof expressing a chemical reactionwith the help of formulae, ofreactants and products.HCl + NaOH NaCl + H2O
9. 9. Na2CO3 + HCl NaCl + H2O +CO2Na2CO3 + HCl 2NaCl + H2O +CO2Na2CO3 +2HCl 2NaCl + H2O+CO2
10. 10. Al2O3 + NaOH Na3AlO3 + H2OAl2O3 + NaOH 2Na3AlO3 + H2OAl2O3 + 6NaOH 2Na3AlO3 + H2OAl2O3 + 6NaOH 2Na3AlO3 + 3H2O