Padhle 10th Chemical Reactions & Equations PDF

. adhle.i @ adhle.i Chemical Reac ions & Eq a ions CH 1 Sc c Ca 10 No e + 10 Yea In eg a ed PYQ'. adhle.i @ adhle.i adhle.in. adhle.i @ adhle.i adhle.in ...

. adhle.i @ adhle.i Chemical Reac ions & Eq a ions CH 1 Sc c Ca 10 No e + 10 Yea In eg a ed PYQ'. adhle.i @ adhle.i adhle.in. adhle.i @ adhle.i adhle.in  Chemical Reactions and Equations What is Chemical Reaction ? A chemical reaction is in which the bonds are broken within reactant molecules , and new bonds are formed within product molecules in order to form a new substance. How to know if Chemical Reaction has taken place ? (MBF Er ?) These type of observations help to determine wheter chemical reaction has taken us a place - change in state change in colour change in temperature evolution gas of a formation of precipitate chemical Equation The simplest to write equation this in the equation way an is form a word - Oxide Magnesium + Oxide → Magnesium ( Reactants) ( Product ) Chemical equations can be made more concise and useful if we use chemical formulae instead of words. Mg t Oz → MgO Magnesium -1 Oxide Magnesium Oxide  Balancing a chemical equation Fet H2O → Fez Og + H'z → Lets balance this ! Element Number of atoms in Number of atoms in reactants ( LHS) products ( RHS ) " , Fe 9 ' 3 H 2 2 O 9 4 * It is often convenient to start balancing with the compound that contains the maximum number atoms of. To balance the atoms oxygen - Atoms of In reactants In products Oxygen 1) Initial 9 (in H2O) 4 ( in Fez Oa ) ) To balance ii 9×4 4 To balance the atoms oxygen - Fe +4 H2O → Fez Ou t Hz  To the number equalise of H atoms make , the number of molecules of molecules RHS of hydrogen as four on the. Atoms Of hydrogen In reactants In products 1) Initial 8 (in 41120) 21in He ) ii) To balance 8 2×4 Fe t 4 H2O → Fez Out 4 He Examine the above equation and pick up the third element which is not balanced. Find that only one element is left to be balanced that , is , iron. Atoms iron In In of reactants products 1) Initial 9 ( in Fe) 3 Cin Fez Oa ) ii) To balance 9×3 3 3. Fe t 4h20 → Fez Oat 4th Writing Symbols of Physical State : To make chemical informative the equation physical States of the reactants a more , and products with their are mentioned along chemical formulae. reactants gaseous liquid aqueous and The solid States of and products are , , represented by the notations ( g ) Cl) , , Cs) and Cag) respectively.  → Intent Answers: ⑨ When magnesium is kept in air for a long time , it gets covered with a layer of magnesium oxide. This restrict the burning of magnesium ayer. Therefore before burning it is to be cleaned. , , ② 9) Hydrogen 1- Chlorine → Hydrogen chloride Hzt ( Iz → ZHU %) Barium chloride + Aluminium Sulphate → Barium Sulphate t Aluminium chloride 3Ballet Alds → Bas 04+2 AlCes iii) Sodium t Water → Sodium hydroxide -1 Hydrogen 2 Na t 2h20 → 2NaOH t Her ③ i) Baclzcaq , t Naa Sona → BasOa.es, t 2 NaCl can ii) NaOHcant Hclcaq → NaClcanst thou, , Type of Chemical Reactions combination Reaction * It be chemical reaction which two substances combine may defined as a in or more to form a single substance under suitable conditions. Calcium lime ( calcium - oxide reacts vigorously with water to produce slaked hydroxide) releasing a large amount of heat. CaOcs, + H2O → Calotlzcaq, Reactions in which heat released formation of products is along with the are called exothermic reactions. Eixample : Burning of coal ( Cs) -102cg, → (02cg, Decomposition Reaction * A reaction in which a compound splits up into two or more simpler substances is known as a decomposition reaction. # Fez ZFESOy.es , Oses, -1502cg, -1503cg, ( ferrous sulphate) ( ferric oxide) White silver chloride turns in sunlight grey. - This is due to the decomposition of silver chloride into silver and chlorine by light. 2. Ageless 9ht 2 Ages, t Hug , "> 2. Ag Bros, 2.Ages, t Brzeg, The above reactions in black and are used white photography. → Reactions in which energy is absorbed are known as endothermic reactions. Answer ⑨ 9) The substance that is used for white washing is Calcium Oxide and its formula is Cao ( or quicklime). ' %) CaOcs, + thee, → CalOH)zcaq, Calcium Oxide Calcium hydroxide ( Quick lime) ( slaked lime) ② In 9.7 activity , to give Hz at one electrode water is electro lysed and at the other electrode 02. 21120Ce) → 2112cg t 02cg , ) - Hence , after the water is electrolyzed the two molecules of water give two hydrogen molecule and one molecule gas oxygen gas. Displacement Reaction chemical reaction which a reactive element displaces Displacement reaction is a in more a less reactive element displace a less reactive element from its compound. 1 Fees, t (usoiceaq , → ESOa cage, -1 Cues, copper Iron sulphate Sulphate  Double Oiigoaement Those reaction in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. In double displacement reactions the positive ions exchange negative ion partners. , A double displacement reaction is represented by the general equation. Nazsoicaast Back can,→ Bashes , -12 NaCl can ( Sodium ( Barium ( Barium ( sodium Sulphate) chloride ) Sulphate) chloride) Oxidation and Reduction * substance If a gains oxygenduring a reaction it is said to be , oxidised. If substance loses reaction it is said to be a oxygen during a reduced -. , Oxidation Cu Ot Hata cut ^ Hio Reduction Corrosion When metal is attacked substances around it such moisture , acids , etc , a by as - it is said to corrode and this is called corrosion process. The - black coating on copper are other examples of corrosion.  Rancidity When fats and oils they taste are oxidised , become rancid and their smell and change -. Usually substances which prevent oxidation (antioxidants) are added to foods containing fats and oil. → → 1 Mark Questions (Including MCG 's) Reaction l Reaction 2. Marks Questions Reaction 3 Marks Questions 5 Marks Questions & ( Always refer NCERT for activity based questions) Assertion and Reasoning ( As per latest syllabus ) 2020-29 estions