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Hogar Banco de preguntas Química Archive 2025 January 22

Chemistry Questions from Jan 22,2025

Browse the Chemistry Q&A Archive for Jan 22,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Which phrase defines activation energý? (1 point) energy required to break a chemical bond energy stored in chemical bonds energy input needed to break bonds of reactants Plutonium- 238 has a yearly decay constant of . If an original sample has a mass of 15 grams, how long will it take to decay to 12 grams? A. 3 years B. 12.3 years C. 28.3 years D. 139.1 years When hydrogen burns in oxygen and forms water, which bonds are broken and which bonds are formed? (1 point) One bond is broken, one bond is broken, and two bonds are formed. Two bonds are broken, one bond is broken, and two bonds are formed. Two bonds are broken, one bond is broken, and four bonds are formed. Two bonds are broken, one bond is broken, and four bonds are formed. When sodium and chlorine are combined, a small amount of table salt is formed and a bright yellow light and a lot of heat are given off. Does it take more energy to break the bonds of the reactants, or is more energy released when forming the bonds of the products? How do you know? (Y point) More energy is released when forming the bonds of the products because a lot of heat is given off, which indicates energy was released. It takes more energy to break the bonds of the reactants because yellow light is given off, which indicates energy was absorbed in the beginning. It takes more energy to break the bonds of the reactants because a lot of heat is given off, which indicates energy was absorbed in the beginning. More energy is released when forming the bonds of the products because yellow light is given off, which indicates energy was released. Molecules are not reacting using current methods. Which change can encourage reaction? (1 point) adding heat speeding up the molecules by mixing removing heat adding another chemical Which phrase best describes activation energy? (1 point) the energy required to rearrange and switch individual molecules within two compounds the energy given off when rearranging and switching individual molecules within two compounds the minimum amount of energy required to break bonds and start a chemical reaction the minimum amount of energy required to form bonds and end a chemical reaction In order for a reaction to occur, which action must happen? (1 poin Molecules must collide at a low enough energy to break bonds. Molecules must divide at a low enough energy to break bonds. Molecules must divide at a high enough energy to break bonds. Molecules must collide at a high enough energy to break bonds. Use the chemical equation to answer the question. Which statement describes the breaking and forming of bonds in the reaction? (1 point) The reaction requires breaking four bonds, and then forming one bond and two bonds. The reaction requires breaking one bond and two bonds, and then forming four bonds. The reaction requires breaking four bonds, and then forming one bond and two bonds. The reaction requires breaking one bond and two bonds, and then forming four bonds. Which statement explains why the electrolysis of hydrochloric acid is an endothermic reaction? (1 point) It requires bonds to be broken. It requires electricity to sustain the reaction. It results in two distinct gases, not liquids or solids. It releases more energy than it absorbs. Hydrogen gas and oxygen gas combine. Which change occurs that indic a release of bond energy? (1 point) a loud popping noise the formation of bubbles a strong odor the appearance of color in the gases
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