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2 years ago

Write the ion symbol for an atom with the given number of protons and electrons.

Chemistry

1 answer:

Taya2010 [7]2 years ago

8 0

The element is identified with the number of protons, and the element with 55 protons is Cs.

Since there are 54 electrons, the overall charge is +1, so the answer is $\boxed{\text{Cs}^{+}}$

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Which statements accurately describe binary star systems? Check all that apply. have more than two stars have stars that are alw

Westkost [7]

Answer:

have stars that might appear to wobble

often have one star that is brighter than the other

Explanation:

A binary star system is a star system made up of mostly two stars that moves round their common fixed center.

The two orbiting stars are gravitationally bonded to one another and they move round each other.

Most binary stars might appear wobble. One of the stars often appears brighter than the other.

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3 years ago

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. Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of

Len [333]

Answer:

The answer is surface tension.

Explanation:

The high surface tension helps the paper clip - with much higher density - float on the water. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension. hope this helps :)

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3 years ago

Technological advances in microbiology are providing evidence which indicates:

melomori [17]

Cells and microorganisms are extremely complex

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3 years ago

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Necesito ayuda con esto no le entiendo nada

tatyana61 [14]

Answer:

Explanation:

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3 years ago

The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min for

Zigmanuir [339]

Answer:

Therefore it takes 8.0 mins for it to decrease to 0.085 M

Explanation:

First order reaction: The rate of reaction is proportional to the concentration of reactant of power one is called first order reaction.

A→ product

Let the concentration of A = [A]

$\textrm{rate of reaction}=-\frac{d[A]}{dt} =k[A]$

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

[A₀] = initial concentration

[A]= final concentration

t= time

k= rate constant

Half life: Half life is time to reduce the concentration of reactant of its half.

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

Here $t_{\frac{1}{2} }=0.13 min$

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

$\Rightarrow k=\frac{0.693}{13 }$

To find the time takes for it to decrease to 0.085 we use the below equation

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

$\Rightarrow t=\frac{2.303}{k} log\frac{[A_0]}{[A]}$

Here , $k=\frac{0.693}{13 }$ , [A₀] = 0.13 m and [ A] = 0.085 M

$t=\frac{2.303}{\frac{0.693}{13} } log(\frac{0.13}{0.085})$

$\Rightarrow t= 7.97\approx 8.0$

Therefore it takes 8.0 mins for it to decrease to 0.085 M

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3 years ago