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mamaluj [8]
3 years ago
5

Which group reacts with water to form hydrogen

Chemistry
2 answers:
cluponka [151]3 years ago
8 0
The answer is alkali metal groups i think
Paha777 [63]3 years ago
4 0

Answer: The answer is the alkali metals group! Hope this helps!

Explanation:

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How many half-lives will pass by the time 1.56% of I-131 is present? B. Approximately how many days does that equal? *
serg [7]

Answer: Hmmmmm that's crazy....

There are a couple of equations one could use for this type of problem, but I find the following to be the easiest to use and to understand.

Fraction remaining (FR) = 0.5n

n = number of half lives that have elapsed

In this problem, we need to find n and are given the FR, which is 1.56% or 0.0156 (as a fraction).

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log 0.0156 = n log 0.5

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n = 6.0 half lives have elapsed

Explanation:

Just wanted to help. Hopefully it's correct wouldn't want to waster your time ;)

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