A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.
A) The half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases
Explanation:
The rate at which elements decays radioactively is directly proportional to the number of atoms present in it. This is a simple first-order kinetics.
The half-life of a radioactive element is the time taken for half of the radioactive nuclei to disintegrates.
The shorter the half life, the larger the decay constant and the faster the decay process. If a radioactive decay is fast, the mass of the reactants will decrease significantly with time thereby producing more of the daughter isotopes.
The reactant in a radioactive decay are the parent isotopes. The products are the daughter isotopes.
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Answer:
C
Explanation:
The questions states that some particles were deflected meaning both the nucleus and the particles were the same charge because they repelled. Using common knowledge, we know that the nucleus is positively charged. Using this information, you can immediately eliminate choices A and B. Choice D says that the positive charge was spread throughout its structure. This is false because protons and neutrons are only found in the nucleus. Electrons are the subatomic particles found outside the nucleus, thus you can get rid of choice D, only leaving you with choice C.
Given are:
1) CuSO4 + BaCl2 ---> BaSO4 + CuCl2
2) <span>Pb(NO3)2 + 2NaCl ---> PbCl2 + 2NaNO3
3) </span><span>N2 + 3H2---> 2NH3
4)</span><span>K2SO4 + BaCl2---> BaSO4 + 2KCl
Among the 4 reactions above, the only oxidation - reduction reaction is number 3:
N2 + 3H2 ----> 2NH3
since the oxidation numbers of N and H decreased and increased, respectively making the reaction RedOx. </span>