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pav-90 [236]
3 years ago
8

Sxdcfvbnm,.lkjhgfdsdfghjkl

Chemistry
1 answer:
tankabanditka [31]3 years ago
7 0

daRfwrqesafafawrfasf thats your answer yw


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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).

0.0156 = 0.5n

log 0.0156 = n log 0.5

-1.81 = -0.301 n

n = 6.0 half lives have elapsed

Explanation:

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

6 0
3 years ago
How did the Bohr model of the atom affect scientific thought?
Vadim26 [7]

Answer:

C. Scientists accepted the model at first but later rejected it.  

Explanation:

Scientists accepted the model at first because it explained the hydrogen emission spectrum.

However, with the development of quantum mechanics, scientists had to modify the model (not reject it).

Electrons still had specific energies, but they no longer travelled in fixed orbits.

Instead, electrons had a probability of being found in a given region of space.

5 0
3 years ago
Read 2 more answers
Find the molarity of 131 g Ba(NO3)2 dissolved in 750.0 water
storchak [24]

Answer:

6.68 x 10^-4

Explanation:

131g ÷ 261.337g/mol = 0.5012685 moles

0.5012685 moles ÷ 750.0 liters =

0.5012685÷ 750.0=0.000668358

6.68 x 10^-4

8 0
2 years ago
How does the air temperature at the bottom of a mountain compare with the air temperature at the top of the mountain?
tia_tia [17]

Explanation:  C) the air temp. at the top is lower

5 0
2 years ago
the formation of all heavenly bodies is governed by the law of electricity and magnetism the law of universal gravitation the el
maksim [4K]
The law of Universal Gravitation.
8 0
3 years ago
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