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ArbitrLikvidat [17]
3 years ago
14

Fill in all the grey boxes including the green box. PLEASE HELP

Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
6 0

Answer:

2Na + 2H2O ----> 2NaOH + H2

Explanation:

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Which of the following could have the electron configuration 2.8?
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The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.
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It will take 6.6 hours for 75% of the lead to decay.

Explanation:

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The half life and rate constant are related as

k=rate constant=\frac{0.693}{halflife}=\frac{0.693}{3.3}=0.21h^{-1}

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At= final concentration = 0.25 g (as 75% undergoes decay so 25% left]

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