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natta225 [31]
3 years ago
13

Please help with this question... It's six marks to could you put six marks....

Chemistry
1 answer:
professor190 [17]3 years ago
3 0
Can you take a better pic cant see the questions
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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
Plz help!!!!!!
Sever21 [200]

this shows that magnesium is higher in the reactivity series than lead.

I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.

5 0
4 years ago
Which of those is a balanced chemical equation? (super important)
alexgriva [62]

I believe C is the balanced equation.

7 0
3 years ago
Read 2 more answers
Does this equation follow the Law of Conservation of Mass (Yes or No)
notka56 [123]
Yes I think it’s look right to me
3 0
3 years ago
What coefficient must be added to the carbon in the reactants to balance the following equation?
Sophie [7]

Answer:

2

Explanation:

There are  3 carbons on the right side

there are only two on the left side....you need one more ...so add one more... change the '1' coefficient in front of C   to  '2'

7 0
2 years ago
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