The opposite of an exothermic process is an endothermic process, one that absorbs energy usually in the form of heat. The term exothermic was first coined by 19th-century French chemist Marcellin Berthelot. a spark, flame, or flash), electricity (e.g. In thermodynamics, an exothermic process (from Ancient Greek έξω ( éxō) 'outward', and θερμικός ( thermikós) 'thermal') is a thermodynamic process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. Explosions are some of the most violent exothermic reactions. When the wax is burnt in the form of a candle, it produces water and carbon dioxide.Not to be confused with Ectothermic. Question 6: State one characteristic of chemical reaction which takes place when the wax is burned in the form of a candle. Hence, this reaction is characterized by a “change in temperature”. When quicklime is treated with water, slaked lime is formed with the evolution of a large amount of heat. Question 5: State one characteristic of chemical reaction which takes place when quick lime is treated with water. Hence, this reaction is characterized by a “change in colour”. When lemon juice is added gradually to potassium permanganate solution, there is a change in colour from purple to colourless. Question 4: State one characteristic of chemical reaction which takes place when lemon juice is added gradually to potassium permanganate solution. Hence, “formation of a precipitate” and “change in colour” are the two characteristics of this chemical reaction. On adding potassium iodide solution to lead nitrate solution, yellow precipitates of lead iodide are formed and the colour of the solution changes from colourless to yellow. Question 3: Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution. Hence, “evolution of a gas” and “change in temperature” are the two characteristics of this chemical reaction. When the dilute sulfuric acid is poured over zinc granules, hydrogen gas is evolved and the mixture becomes hot. Question 2: State two characteristics of the chemical reaction which takes place when diluting sulfuric acid is poured over zinc granules. The characteristics of a chemical reaction are: Evolution of gas, Formation of a precipitate, Change in colour, Change in temperature, Change in state etc. Question 1: State the various characteristics of chemical reactions. The combustion reaction of candle wax is characterized by a change in state from solid to liquid and gas.Ĭ XH Y + O 2 ⇢ CO 2 + H 2O + Heat and Light. Some chemical reactions are characterized by changes in state. The chemical reaction between barium hydroxide and ammonium chloride to form barium chloride, ammonia and water are characterized by a change in fall in temperature.The chemical reaction between quicklime and water to form slaked lime is characterized by a change in rising in temperature.The chemical reaction between sulfur dioxide and acidified potassium dichromate solution is characterized by a change in colour from orange to green.Citric acid oxidizes potassium permanganate because it is a reducing agent.ģKMnO 4 + C 6H 8O 7 ⇢ 3HMnO 4 + C 6H 5K 3O 7 The chemical reaction between citric acid and potassium permanganate solution is characterized by a change in colour from purple to colourless.Some chemical reactions are characterized by changes in colour. Software Engineering Interview Questions.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Commonly Asked Data Structure Interview Questions.Top 10 algorithms in Interview Questions.Top 20 Dynamic Programming Interview Questions.Top 20 Hashing Technique based Interview Questions.Top 50 Dynamic Programming (DP) Problems.Top 20 Greedy Algorithms Interview Questions.Top 100 DSA Interview Questions Topic-wise.
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