Chemistry, 21.11.2020 01:30 lerasteidl

I'm bored anyone wanna tell the story of their first crush?

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Not really a story but the first time I ever had alone time with my crush I accidentally sat on their phone and im thicc so i didnt even notice until they told me i was sitting on it

Answer from: keke6361

one girl in one of my classes. I was always a loner, but I did what I could to try to join her table. At some point, she joined me at the table I sat at so I wouldn't be lonely. Disappeared for a few months, then came back and started talking to me more. The next thing I knew, she was asking for my phone number and asking me out to the school dance. Too bad the relationship didn't work out. I still miss her.

Explanation:

Answer from: Quest

part 1: the half-life of the element is 22 years.

part 2: it will take 132.02 year for the sample to decay from 308.0 g to 4.8125 g.

explanation:

part 1: there are two ways to determine the half life time.

first way: the half life time can be determined directly from its definition as it is the time required for the sample to decay to its half concentration.

from the data the initial concentration was 45.0 g and decayed to its half value (22.5 g) in 22.0 years.

second way: the radio active decay is considered first order reaction so we can use the laws of first order reactions.

k = (1/t) ln (a/a-x), where k is the rate constant of the reaction,

t is the time of the reaction

a is the initial concentration of the reactant

a-x is the remaining concentration at time (t)

a = 45.0 g the initial concentration at t = 0 year.

at t = 22 year, a-x = 22.5 g

then k = (1/22 year) ln (45.0 g/ 22.5 g) = 0.0315 year-1.

the half-life time (t1/2) = ln 2/ k = 0.693/ k =0.693/ 0.0315 = 22 years.

part 2:

using the same law k = (1/t) ln (a/a-x),

using the given data; a = 308.0 g and a-x = 4.8125 g and the calculated k from the part 1 (k = 0.0315 year-1)

t = (1/k) ln (a/a-x) = (1/0.0315) ln (308.0/ 4.8125) = 132.02 years

Answer from: Quest

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

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