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4 years ago

What is the best description of what Becquerel observed in his experiment?

Chemistry

2 answers:

Zigmanuir [339]4 years ago

4 0

He is best known for his discovery of radioactivity.

galina1969 [7]4 years ago

3 0

He is best known for his discovery of radioactivity, first reported just over a century ago in the selection reproduced here. <span>The discovery of radioactivity thus represents a key development in the modern understanding of the atom. Hope this helps. Have a nice day.</span>

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Samarium-146 has a half-life of 103.5 million years. After 1.035 billion years, how much samarium-146 will remain from a 205-g s

BaLLatris [955]

Answer : The correct option is, 0.200 g

Solution :

As we know that the radioactive decays follow first order kinetics.

First we have to calculate the rate constant of a samarium-146.

Formula used :

$t_{1/2}=\frac{0.693}{k}$

Putting value of $t_{1/2}$ in this formula, we get the rate constant.

$103.5\times 10^6=\frac{0.693}{k}$

$k=6.6\times 10^{-9}year^{-1}$

Now we have to calculate the original amount of samarium-146.

The expression for rate law for first order kinetics is given by :

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant = $6.6\times 10^{-9}year^{-1}$

t = time taken for decay process = $1.035\times 10^{9}years$

a = initial amount of the samarium-146 = 205 g

a - x = amount left after decay process = ?

Putting values in above equation, we get the value of initial amount of samarium-146.

$6.6\times 10^{-9}=\frac{2.303}{1.035\times 10^{9}}\log\frac{205}{a-x}$

$a-x=0.200g$

Therefore, the amount left of the samarium-146 is, 0.200 g

4 0

4 years ago

Read 2 more answers

Vlad1618 [11]

Answer:

i think it would be A

Explanation:

5 0

3 years ago

Which of the following is the balanced equation for P + O2 → P2O5? Question 3 options: A) 4P + O2 → 2P2O B) P + 5O2 → 2P2O5 C) 4

Luden [163]

Given equation:

P + O2 → P2O5

In order for the equation to be balanced, the stoichiometry of the atoms of one kind on the reactant side must be equal to that on the product

Reactants Products

P = 1 P = 2

O = 2 O = 5

The balanced equation would be:

4P + 5O2 → 2P2O5

Reactants Products

P = 4 P = 4

O = 10 O = 10

Ans: D)

4 0

4 years ago

Read 2 more answers

Using the valence bond method, explain the structure of isocyanic acid in terms of the atomic bond method.

Gala2k [10]

The structure of isocynide is

N=C

What is the importance of VSEPR theory?

Valence bond theory describes the electronic structure of molecule .The theory says that electrons fills the atomic orbitals of an atom within a molecule .

In the structure of isocynide there are triple bonds between Nitrogen and carbon . The bond length is 115.8pm and the bond angle is 180°. There is two pi and one sigma bond .

to learn more about VSEPR theory click here brainly.com/question/23129240

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4 0

2 years ago

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Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 1.20 MJ 1

mars1129 [50]

Answer : The mass of liquid sodium needed are, $3.17\times 10^3g$