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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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Is a burning fire endothermic or exothermic? How do you know? (1 point) A burning fire is exothermic because a lot of heat is given off as the wood is converted into carbon dioxide and water. A burning fire is endothermic because a lot of heat needs to be applied in the form of fire to break the bonds of the wood. A burning fire is exothermic because a lot of heat needs to be applied in the form of fire to break the bonds of the wood. A burning fire is endothermic because a lot of heat is given off as the wood is converte into carbon dioxide and water. Is a burning fire endothermic or exothermic? How do you know? (1 point) A burning fire is exothermic because a lot of heat is given off as the wood is converted into carbon dioxide and water. A burning fire is endothermic because a lot of heat needs to be applied in the form of fire to break the bonds of the wood. A burning fire is exothermic because a lot of heat needs to be applied in the form of fire to break the bonds of the wood. A burning fire is endothermic because a lot of heat is given off as the wood is converte into carbon dioxide and water. Which statement correctly describes how energy transforms? (1 point) When a fire is burning, visible energy is turned into thermal energy in the form of light and chemical energy in the form of heat. When a fire is burning, visible energy is turned into chemical energy in the form of light and thermal energy in the form of heat. When a fire is burning, thermal energy is turned into visible energy in the form of light and chemical energy in the form of heat. When a fire is burning, chemical energy is turned into visible energy in the form of ligh and thermal energy in the form of heat. Atomic mass, Relative atomic mass, mass number and relative abundance Question - The ratio of the mass of an aluminium atom t Carbon- 12 atom is . Calculate the relative atomic mass of aluminium. \{Ans: 26.976 ). Is freezing an endothermic or exothermic process? How do you know? (1 point) Freezing is endothermic because as water bonds into ice, the bonds absorb energy from the environment in order to change states. Freezing is exothermic because as water bonds into ice, the bonds absorb energy from the environment in order to change states. Freezing is endothermic because as water bonds into ice, the energy from bond formation is released and heats up the surrounding enviroriment. Freezing is exothermic because as water bonds into ice, the energy from bond formation is released and heats up the surrounding environment. How are activation energy and reaction rate most likely related? (1 point) A faster reaction rate results in higher activation energȳ. Higher activation energy results in a slower reaction rate: A faster reaction rate results in lower activation energy. Higher activation energy results in a faster reaction rate. How can the chemical potential energy in an endothermic reaction best be described? (1 point) Reactants have higher chemical potential energy than products. Products have higher chemical potential energy than reactants. Product and reactant chemical potential energy varies in different environments. Which statement correctly explains a difference between white and red phosphorus? (1 point) White phosphorus has a lower activation energy than red phosphorus. White phosphorus has less chemical potential energy than red phosphorus. White phosphorus has more chemical potential energy thas a higher activation energy than red phosphorus. Whorus. What is the hydronium ion concentration in milk if it has a pH of 8.2 ? A. B. C. D. Which phrase defines chemical potential energy? (1 point) energy required to break a chemical bond energy stored in chemical bonds energy input needed to break reactant bonds energy output when product bonds form
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