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A set of questions and answers related to an integrated science a - unit 4 exam. It covers a wide range of topics in chemistry, including chemical reactions, reaction rates, equilibrium, and radioactivity. The document examines various chemical equations, discusses the roles of reactants and products, and explores concepts like the law of conservation of mass, the law of conservation of energy, and le châtelier's principle. It also delves into the types of radioactive decay, the characteristics of radioactive particles, and the use of radioactive isotopes for dating purposes. A comprehensive overview of the key topics and concepts covered in this unit of the integrated science a course, making it a valuable resource for students preparing for the exam.
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an atom of magnesium and two atoms of chlorine react and yield the compound of magnesium chloride.
what is the best classification for the equation's reaction? - synthesis examine the reactants of the incomplete double displacement reaction. AgNO3 + NaCl →→ [blank]. what are the products of the double displacement reaction? - AgCl + NaNO which option shows a reaction in which calcium carbonate (CaCO3) produces calcium oxide and carbon dioxide? - decomposition: CaCO3 →→ CaO + CO a beaker containing a chemical reaction feels hot to the touch. according to the law of conservation of energy, what best predicts the stability of the products? - if the reactants released thermal energy when they reacted, they must have lost an equal amount of potential energy. the products will be more stable. which option describes the behavior of energy in exothermic reactions? - the energy of the products is less than the energy of the reactants, so energy is released into the surrounding environment. what does a scientist observe in a chemical's reaction rate? - the speed at which the reactants change to products over a given time. which reaction will have the fastest reaction rate? - https://assets.learnosity.com/organisations/625/asset/media/ which reaction represents the slowest reaction rate? - https://assets.learnosity.com/organisations/625/asset/media/ how will the addition of a catalyst affect the reaction rate of the chemical reaction? - it will cause the reaction rate to increase.
what type of particle is emitted by each type of radioactive decay? - alpha = nucleus of a helium atom beta = electron gamma = photon what nuclear reaction product has the least mass? - beta particle what is the most minimal type of protective barrier that could block the radioactive particles from this reaction? - a piece of paper which kind of nuclear reaction does this equation represent? - beta decay what happens to the half-life and mass of reactants broken down during a nuclear decay reaction? - the half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases. what percentage of a radioactive isotope remains after 4 half-lives? - 6.25% which reaction model represents a nuclear fission reaction? - n + A →→ B + C + n which one or more of these isotopes would be more likely to undergo nuclear decay, and why? - carbon- 14 and hydrogen-3 would be more likely to decay, because their neutrons and protons are not equal. based on this graph, what might be the best use of this radioactive isotope? - determine the age of objects less than 50,000 years old which feature of the model indicates that it represents nuclear fusion? - a helium nucleus is produced from two smaller hydrogen atoms combining.