Chemical Change And Physical Change solution

Chemical Change And Physical Change solution:

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes occur when objects or substances undergo a change that does not change their chemicalcomposition. This contrasts with the concept of chemical change in which the composition of a substance changes orone or more substances combine or break up to form new substances. In general a physical change is reversibleusing physical means. For example salt dissolved in water can be recovered by allowing the water to evaporate. Reactants must be moving fast enough and hit each other hard enough for a chemical reaction to take place.Increasing the temperature increases the average speed of the reactant molecules.As more molecules move faster,the number of molecules moving fast enough to react increases, which results in faster formation of products.

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Key Lessons from the Movie- ‘3 Idiots

Key Lesson from 3Idiot Movie Key Lessons from the Movie- ‘3 Idiots’: Every movie has a meaning, carrying a message. However, it depends upon the viewer to grab the message and apply the same in life. The bollywood blockbuster ‘3 Idiots’ is an inspiring story of three students Rancho, Farhan Qureshi and Raju Rastogi who have joined the Imperial College of Engineering. In brief, the five key lessons that we can draw from the movie can well be described below. Chase excellence, instead of success, and success will follow and run after you: Rancho, who is an orphaned boy, had got interest in engineering since his early childhood. He, right from the very beginning till the end, sticks to his conviction that it is not success in life but excellence that must be pursued with passion. His words, ‘make your passion, your profession’ sets the tone around which the plot of the movie is woven. Rancho pursues his goal with passion and hence emerges as the student of the...

5 Historic ISRO Missions That Redefined India’s Space Legacy

The Indian Space Research Organisation (ISRO) has transformed from a modest agency into a global space powerhouse. From discovering water on the Moon to reaching Mars in a single shot, these five missions represent the "Big Five" of Indian space exploration. 1. Chandrayaan-1 (2008): The Mission That Found Water Launched on October 22, 2008, Chandrayaan-1 was India's first step toward the Moon. While it was an orbiter mission, its impact was felt worldwide. The Breakthrough: It provided the first conclusive evidence of water molecules (H2O) and hydroxyl (OH) on the lunar surface. Legacy: This discovery shifted the global narrative of lunar exploration, turning the "dry" Moon into a potential base for future human colonies. 2. Mangalyaan (2013): First Attempt, Global Success The Mars Orbiter Mission (MOM) made India the first country in the world to reach Martian orbit on its very first attempt . The "Bahubali" of Efficiency: Costing on...

Uranium (यूरेनियम)

Uranium( यूरेनियम): Uranium: Uranium is a very heavy metal which can be used as an abundant source of concentrated energy. Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 has the distinction of being the only naturally occurring fissile isotope. Uranium-238 is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor. Another fissile isotope, uranium-233, can be produced from natural thorium and is also important in nuclear technology. While uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons, uranium-235 and to a lesser degree uranium-233 have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction. This generates the heat in nuclear power reactors, and produces the fissile material for nuclear weapons. Depleted uranium (238U) ...

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