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Licemer1 [7]
3 years ago
9

Helpppppp plzzzzzzz! file attached below!

Chemistry
2 answers:
Andrei [34K]3 years ago
7 0
It gets scattered, So, C) Diffuse Absorbtion

docker41 [41]3 years ago
6 0
Im pretty sure its c 
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What is the difference between tempering and annealing
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What is the polution that is in our environment today?
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Be sure to answer all parts. A freshly isolated sample of 90Y was found to have an activity of 2.2 × 105 disintegrations per min
Leokris [45]

Answer:

The half-life is  t_h = 3.856*10^{3} minute

Explanation:

From the question we are told that

     The sample is  90 Y

      The first  activity is  A_1  = 2.2 *10^5  per minute

       The second  activity is  A_2  = 5.8 *10^3  per minute

        The duration from 1:00 p.m. on December 3, 2006 to 2:15 p.m. on December 17, 2006   is

               t = 14 \ days \ 1 hr \ 15 min

Converting to minutes we have  

               t =  (14 * 24 * 60) +  (1* 60) + 15

               t = 20235 \ minutes

The first order rate constant for this disintegrations can be mathematically represented  as

               ln \frac{A_2}{A_1}  =  - \lambda t

 Where \lambda is the rate constant

    Substituting values

                     ln [\frac{5.8 * 10^{3}}{2.2 *10^{5}} ] = -  \lambda * 20235

                    -3.6358 = -  \lambda * 20235

So

                \lambda =  \frac{3.6358}{20235}

                    \lambda = 1.7968 *10^{-4} minute^{-1}

The half life is mathematically represented as

               t_{h} = \frac{0.693}{\lambda }

So           t_h = \frac{0.693}{1.7968 *10^{-4}}

              t_h = 3.856*10^{3} minute

               

5 0
3 years ago
Electron affinity is the measure of the attraction of an electron toward an isolated gaseous atom. When an electron is added to
Leno4ka [110]

Answer:

.Electron affinity is -142 kJ<---------->O(g)+e−→O−(g)Process involves single electron addition

O−(g)+e−→O2−(g)<--------> Electron affinity is +710 kJ. .Process is endothermic

Cl(g)+e−→Cl−(g)=Electron affinity is -349 kJ. Process involves single electron addition

None of the of thee reactions ----------Electron affinity is +142 kJ.

Explanation:

Negative electron affinity values indicate that energy is given out when the atom accepts an electron. Halogens evolve a large amount of heat on forming halide ions.

Substantial amount of energy is absorbed when two electrons are added to O2- thus its electron affinity has a positive sign. Energy is evolved on adding only one electron to form O- is hence it has a negative value of electron affinity as shown.

7 0
3 years ago
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