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Licemer1 [7]
3 years ago
13

How many nonmetals are on the periodic table?

Chemistry
1 answer:
jekas [21]3 years ago
7 0
There are 17 nonmetals
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Alex_Xolod [135]

i think that the answer is D

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3 years ago
PLEASE HELP ME!!!
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Answer:

A) a chain reaction that is caused by nuclear fission

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3 years ago
The half life for the first order conversion of A to B is 56.6 hours. How long does it take for the concentration of A to decrea
sveta [45]

Answer:

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

Explanation:

A → B

Initial concentration of the reactant = x

Final concentration of reactant = 10% of x = 0.1 x

Time taken by the sample, t = ?

Formula used :

A=A_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}

where,

A_o = initial concentration of reactant

A = concentration of reactant left after the time, (t)

t_{\frac{1}{2}} = half life of the first order conversion  = 56.6 hour

\lambda = rate constant

A=A_o\times e^{-(\frac{0.693}{t_{1/2}})\times t}

Now put all the given values in this formula, we get

0.1x=x\times e^{-(\frac{0.693}{56.6 hour})\times t}

t = 188.06 hour

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

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3 years ago
How many particles are in 2.0 moles of CH4
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Answer: There are 4.8 x 1024 hydrogen atoms in 2.0 moles of CH4

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2 years ago
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(GIVING BRAINLIEST) do what the following image says.
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Answer:

hope it helps.

<h3>stay safe healthy and happy.<u>.</u><u>.</u></h3>

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