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zzz [600]
4 years ago
14

Iodine-131 is a radioactive isotope that is used as a medical tracer to study and treat the thyroid gland. This radioactive elem

ent emits both beta particles and gamma waves. To effectively stop both beta particles and gamma waves, scientists use a chamber composed of...
A) concrete.
B) lead.
C) metal. (Not this one)
D) plastic. (Not this one)

I believe the answer is B, can someone confirm?
Chemistry
1 answer:
4vir4ik [10]4 years ago
8 0
Bonjeur monseur, la french are here! it seems you have a problem with the elements on earth. lead seems correct since it is indeed a harmful material
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Yuki888 [10]
Q=mc(change in temp)
Q is amount of heat, m is mass, c is specific heat

Water:
Q= (50.0g)(4.18 J/g°C)(63°C)
Q= 13167J

Aluminum:
Q= (200.0g)(0.900 J/g°C)(63°C)
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What is the specific latent heat of a fussion for a substance that takes 550 kj to melt 14 kg at 262 k?
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The latent heat is correlated with energy as follows:

Q = mL

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A 0.25-mol sample of a weak acid with an unknown Pka was combined with 10.0-mL of 3.00 M KOH, and the resulting solution was dil
Masteriza [31]

Answer : The value of pK_a of the weak acid is, 4.72

Explanation :

First we have to calculate the moles of KOH.

\text{Moles of }KOH=\text{Concentration of }KOH\times \text{Volume of solution}

\text{Moles of }KOH=3.00M\times 10.0mL=30mmol=0.03mol

Now we have to calculate the value of pK_a of the weak acid.

The equilibrium chemical reaction is:

                          HA+KOH\rightleftharpoons HK+H_2O

Initial moles     0.25     0.03        0

At eqm.    (0.25-0.03)   0.03      0.03

                     = 0.22

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[Salt]}{[Acid]}

pH=pK_a+\log \frac{[HK]}{[HA]}

Now put all the given values in this expression, we get:

3.85=pK_a+\log (\frac{0.03}{0.22})

pK_a=4.72

Therefore, the value of pK_a of the weak acid is, 4.72

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