Содержание
- 2. Chemical changes The formation of new substances takes place with different chemical properties is called chemical
- 4. Different types of chemical reaction 30-09-2015
- 5. In a chemical reaction, the substances which react together are called reactants whereas the new substances
- 6. Different types of chemical reaction Combination reactions Decomposition reactions Displacement reactions Double-displacement reactions Oxidation-reduction reactions Precipitation
- 7. What is combination reaction? A reaction in which two or more substances (elements or compounds) combine
- 8. Examples: H2(g) + Cl2(g) 2HCl(l) Mg(s) + Cl2(g) MgCl2(s) Fe(s) + S(s) FeS (s) MgO(s) +
- 9. Synthesis Reaction: The combination reaction in which a compound is formed from its constituent elements is
- 10. What is decomposition reaction? A reaction in which a substance is broken down into two or
- 11. Various types of decomposition reactions Thermal decomposition reaction Decomposition caused by heating Electrolytic decomposition (electrolysis) reaction
- 12. Examples: ZnCO3(g) ZnO(s) + CO2(g) 2H2O (l) 2H2(g) + O2(g) CaCO3(s) CaO (s) + CO2 (g)
- 13. What is displacement reaction? A reaction in which one part (an atom or a group of
- 14. Examples: Zn(s) + 2HCl(dil) ZnCl2(aq) + H2(g) 2KBr(aq) + Cl2(aq) 2KCl(aq) + Br2(aq) CuSO4(aq) + Zn(s)
- 15. What is double-displacement reaction? A reaction in which the two reacting ionic compounds exchange their corresponding
- 16. Examples: AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq) Ni(NO3)2 (aq) + 2NaOH (aq) Ni(OH)2(s) + NaNO3(aq) 2KBr(aq)
- 17. Oxidation-Reduction Reaction What do you mean by oxidation-reduction reaction? Oxidation reaction: any process involving addition of
- 18. Oxidising agent : The substance which brings about oxidation of other substances is called an oxidising
- 19. Reducing agent: The substance which brings about reduction of other substance is called a reducing agent.
- 20. Different types of chemical reaction 30-09-2015
- 21. What is precipitation reaction? The reaction in which one of the products formed is an insoluble
- 22. Examples: AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) Pb(NO3)2 (aq) + 2KI(aq) PbI2(s) + 2KNO3(aq) BaCl2(aq) +
- 23. What do you mean by exothermic and endothermic reaction? Reaction which is accompanied by evolution of
- 24. Example: H2O(s) + heat H2O(l) (endothermic) C(s) + H2O(v) + heat CO(g) + H2(g) (endothermic) CH4(g)
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