Copy of model answer (2) speed of chemical reaction.doc - Manaret eleman language schools Date:\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026

Copy of model answer (2) speed of chemical reaction.doc -...

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Manaret eleman language schools science department Date:………………………………………………. Prep.3 1-Complete the following sentences : 1-The catalyst changes the rate of the reaction but don't affect either its beginning or end 2-The catalyst decreases the energy needed for the reaction. 3-Catalyst is combined to reactants during the reaction but get separated from them quickly to form the products at the end of the reaction. 4-A small amount of catalyst is often enough to complete the reaction. 5- MnO 2 helps in the increase of hydrogen peroxide breaking up speed. 6-The rate of the chemical reaction increases if the temperature of the reaction increases. 7-The speed of the chemical reaction increases when the concentration of the reactants increases. 8- The burning of aluminium coil in pure . oxygen ( high concentration) is faster than its burning in oxygen of the air ( low oxygen concentration). 9-As the number of collisions between molecules increases , the speed of the reaction increases.
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  • Fall '18
  • mmmm
  • Chemistry, Chemical reaction

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