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Juli2301 [7.4K]
3 years ago
10

Can anyone help me with this question? - Describe three clues that would indicate that a chemical change has taken place.

Chemistry
1 answer:
Semenov [28]3 years ago
4 0
The three clues would be Change in color, solid is produce as a outcome of the reaction and energy transfers

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Radioactive manganese-52 decays with a half-life of 5.6 days. A chemist obtains a fresh sample of manganese-52 and measures its
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Answer: 11.2 days

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

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a = let initial amount of the reactant

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a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{5.6days}=0.124days^{-1}

b) for completion of 75% of reaction

t=\frac{2.303}{0.124}\log\frac{100}{100-75}

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Meteors look like they have tails. Are they the same as comet tails?
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