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IrinaVladis [17]
3 years ago
13

Which radioactive isotope would take the least amount of time to become stable? rubidium-91 iodine-131 cesium-135 uranium-238

Chemistry
2 answers:
Masteriza [31]3 years ago
5 0
The answer is rubidium -91 because it takes a shorter time of 58.4 seconds to become stable.
DanielleElmas [232]3 years ago
5 0

Answer:

the answer is A

Explanation:

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One of relatively few reactions that takes place directly between two solids at room temperature is Ba(OH)2 · 8H2O + ammonium th
Hatshy [7]

Answer:

\boxed{\text{3.1 g}}

Explanation:

We will need an equation with masses and molar masses, so let’s gather all the information in one place.  

M_r:           315.46               76.12

           Ba(OH)₂·8H₂O + 2NH₄SCN ⟶ Ba(SCN)₂ + 2NH₃ + 10H₂O

m/g:             6.5

1. Moles of Ba(OH)₂·8H₂O

\text{Moles of Ba(OH)$_{2}\cdot $8H$_{2}$O}\\= \text{ 6.5 g Ba(OH)$_{2}\cdot $8H$_{2}$O} \times \dfrac{\text{1 mol Ba(OH)$_{2}\cdot $8H$_{2}$O}}{\text{ 315.46 g Ba(OH)$_{2}\cdot $8H$_{2}$O}}\\= \text{0.0206 mol Ba(OH)$_{2}\cdot $8H$_{2}$O}

2. Moles of NH₄SCN

The molar ratio is 2 mol NH₄SCN:1 mol Ba(OH)₂·8H₂O

\text{Moles of NH$_{4}$SCN} =\text{0.0206 mol Ba(OH)$_{2}\cdot $8H$_{2}$O} \times \dfrac{\text{2 mol NH$_{4}$SCN}}{\text{1 mol Ba(OH)$_{2}\cdot $8H$_{2}$O}}\\= \text{0.0412 mol NH$_{4}$SCN}

3. Mass of NH₄SCN

\text{Mass of NH$_{4}$SCN} = \text{0.0412 mol NH$_{4}$SCN} \times \dfrac{\text{76.12 g NH$_{4}$SCN}}{\text{1 mol NH$_{4}$SCN}} =\\\textbf{3.1 g NH$_{4}$SCN}\\\\\text{You must use }\boxed{\textbf{3.1 g}}\text{ NH$_{4}$SCN}

5 0
4 years ago
Which is the more preferred fuel: one with a higher energy density or one with a lower energy density
Nana76 [90]

The higher the energy density of a fuel, the greater the amount of energy it has stored.

<h3>What is the energy density?</h3>

The energy density of a fuel is defined as the amount of energy it possesses per unit volume or per unit weight.

<h3>Characteristics of the energy density</h3>

  • It is the amount of energy accumulated in an energy vector per unit volume or mass.

  • In general, higher density energy sources and carriers are preferable, as many end uses require concentration of such energy.

  • The packaging of energy in liquid hydrocarbons is the one with the highest energy density, that is, the highest energy per volume unit, hence its high use in the transportation sector.

Therefore, we can conclude that in general, fuels, especially low molecular weight fuels, have high energy densities.

Learn more about the energy density here: brainly.com/question/2165966

5 0
3 years ago
Calcium +oxygen in chemicals formulars
inna [77]

Answer:

CaO

Explanation:

Calcium has 2+ charge

Oxygen has 2- charge

5 0
3 years ago
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The ph3 molecule is polar. does this offer experimental proof that the molecule cannot be planar? explain.
Alex
<span>Answer: if it was planar the center of the negative forces and the center of the positive forces would be at the same place, meaning no di-poles would form so it wouldnt be polar. as it is polar it therefore cannot be planar. the neagative center(pole) is above the the positive one due to the pair of unbonded electrons.</span>
7 0
4 years ago
Consider the acid-catalyzed hydration of 3-methyl-1-butene. For each of the four steps, add one or two curved arrows to the reac
UkoKoshka [18]

Answer:

This addition follows MarkowniKov's rule

Explanation:

The image attached shows the mechanism of the reaction. It can easily be seen that a secondary carbocation is formed leading to the alkanol. The image simplifies the mechanism which involves the initial addition of the hydroxide followed by the hydrogen ion.

5 0
4 years ago
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