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Our Member. . Aung Zin Pyae. Myint Myat Min Maung.

Examples of exothermic process. What is exothermic & endothermic reaction?.

Evaporation liquid water. Cooking an egg. Examples of endothermic process.

Suu Myat Noe. Endothermic Reactions Heat is absorbed by reactants to form prücts. Heat is absorbed from the surroundings; as a result, the surroundings get cold. The reactants are lower in energy than the products Represented by an "uphill" energy diagram Exothermic Reactions Heat is released. Heat is released by the reaction to surroundings; surroundings feel hot. The products are lower in energy than the reactants Represented by an "downhill" energy diagram.

Exothermic reactions. Energy is given out to the surroundings Heat is negative Products have less energy than reactants.

Products absort*d Reactants of reaction Figure 9.5.2A: Endothermic Reactions En«gy Off Progress Of reaction Figure 9.5.2B: Exothermic Reactions.

Suu Myat Noe (Host). -A neutralization reaction -The termite reaction.

T. -Most of the chemical reactions are exothermic reaction -Neutralization → Exothermic reaction -Acid + Base → Salt + Water + heat.

→. Fe 2 O 3 +2 Al →2 Fe + Al 2 O 3 + heat Fe2O3+2Al→2Fe+Al2O3+heat.

Suu Myat Noe (Host). -Nuclear fission -Most polymerization reactions.

Nuclear fission. . neutron. Large nucleus changes into small nuclei Produces a large amount of energy during this reaction.

. Most polymerization reactions. - Small molecules monomer large molecules polymer Produces energy very useful in our daily life 20 % of electricity production in US are produced from nuclear power part of nuclear fission production of plastic bags and rubber are produced by polymerizatio n reaction.

Suu Myat Noe (Host). - Corrosion of metals -Dissolving an acid in water.

Corrosion of metals. Destruction of metals because of chemical products acid,water,.. Most reaction are occurred by electrochemical reaction Examples – iron rusting When iron are kept with moist air for a long time, it turns red-brown color During this reaction, it produces large amount of heat energy It is exothermic reaction.

Dissolving of acids in water. When acid dissolves in water, produces H2 Hydrogen ions and increases concentration During this reaction, it produces heat energy to the surroundings The more acids, the more heat energy So, it is exothermic.

Suu Myat Noe (Host). -Combustion of fuel -Respiration.

o cao. Combustion of fuel. -When fuel is burned, hydrocarbon bonds first break down hydrogen and carbon atom then combine with oxygen -CO2, H2O and ENERGY comes out -It’ exothermic reaction because heat or light energy is produced.

oczo. abstract. Respiration. -When we inhale Oxygen, O2 goes to red blood cell -blood carries oxygen and glucose to every cell, the blood reaches in the capillaries -O2 and glucose starts reaction -at that time CO2,WATER and ENERGY come out Used in working muscles, new cell formation and growth.

Suu Myat Noe (Host). -Condensation of water vapor.

.- changes gas into liquid In condensation, molecules in the vapor move faster than the water molecules -Heat energy is transmitted to the products -So, it is an exothermic.

Suu Myat Noe (Host). - Dissolving ammonium chloride in water -Cracking alkanes.

Dissolving ammonium chloride in water. -When NH4CL dissolves in water, it absorbs heat from surroundings It is endothermic since temperature from surroundings drops.

Cracking alkane. -Saturated hydro-carbon molecules are divided into small hydro-carbon molecule -The broken bonds are stronger than the reactant bonds -So, heat energy is required in reactant so it is endothermic.

Suu Myat Noe (Host). abstract. -Evaporation liquid water -Melting ice.

Evaporation liquid water. Melting ice. -When changing from liquid state to vapor state, water molecules absorb heat to increase kinetic energy -That heat energy forces water molecules to break bond and turn into vapor.

Suu Myat Noe (Host). O. -Cooking an egg -Bake a bread.

or—no. Cooking an egg. Baking a bread. -If we cook an egg, egg absorbs heat from oven -Like this, if we bake bread, bread absorbs heat from oven So, these reactions are endothermic reaction.

Conclusion. EXOTHERMIC HEAT Hotter than vs ENDOTHERMIC HEAT HEAT Cooler than.

Thank You For Your Attention.