Answer:
This was important because it supported the concept of discovery of new elements
Explanation:
Mendleev left gaps in his table not discovered at that time, but he predicted the properties (chemical and physical) of undiscovered elements. Mendeleev left the gap next to silicon and named the undiscovered element as 'eka-silicon', the element germanium was discovered later.
Answer:
the roller coaster car with the least potential energy would be the one at the bottom of the roller coaster
Explanation:
Hope this helped
Answer:
The answer is
<h2>0.63 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula
![density = \frac{mass}{volume} \\](https://tex.z-dn.net/?f=density%20%3D%20%20%5Cfrac%7Bmass%7D%7Bvolume%7D%20%5C%5C)
From the question
mass = 47 g
volume = 75 mL
The density is
![density = \frac{47}{75} \\ = 0.626666666...](https://tex.z-dn.net/?f=density%20%3D%20%20%5Cfrac%7B47%7D%7B75%7D%20%20%5C%5C%20%20%3D%200.626666666...)
We have the final answer as
<h3>0.63 g/mL</h3>
Hope this helps you
Answer:
The concentration of
is ![[Hg^{2+}]= 1.26 *10^{-27} mol/L](https://tex.z-dn.net/?f=%5BHg%5E%7B2%2B%7D%5D%3D%201.26%20%2A10%5E%7B-27%7D%20mol%2FL)
The number of
ion is ![A = 0.7588\ ions](https://tex.z-dn.net/?f=A%20%3D%20%200.7588%5C%20%20ions)
Explanation:
Generally the solubility product constant of HgS(s) is ![k_{sp} = 1.6*10^{-54}](https://tex.z-dn.net/?f=k_%7Bsp%7D%20%3D%20%201.6%2A10%5E%7B-54%7D)
This solubility product constant is mathematically represented as
![K_{sp} = [Hg^{2+}][S^{2-}]](https://tex.z-dn.net/?f=K_%7Bsp%7D%20%3D%20%20%5BHg%5E%7B2%2B%7D%5D%5BS%5E%7B2-%7D%5D)
Since the HgS is saturated it implies that the concentration of sulfur ion is the same as that of mercury ion s
![[Hg^{2+}]= [S^{2-}] = z](https://tex.z-dn.net/?f=%5BHg%5E%7B2%2B%7D%5D%3D%20%5BS%5E%7B2-%7D%5D%20%3D%20z)
=> ![K_{sp} =z^2](https://tex.z-dn.net/?f=K_%7Bsp%7D%20%3Dz%5E2)
=> ![z = \sqrt{K_{sp}}](https://tex.z-dn.net/?f=z%20%3D%20%5Csqrt%7BK_%7Bsp%7D%7D)
substituting values
![z = \sqrt{1.6 *10^{-54}}](https://tex.z-dn.net/?f=z%20%3D%20%5Csqrt%7B1.6%20%2A10%5E%7B-54%7D%7D)
![z = 1.26*10^{-27}](https://tex.z-dn.net/?f=z%20%3D%201.26%2A10%5E%7B-27%7D)
=> ![[Hg^{2+}]= [S^{2-}] = 1.26 *10^{-27} mol/L](https://tex.z-dn.net/?f=%5BHg%5E%7B2%2B%7D%5D%3D%20%5BS%5E%7B2-%7D%5D%20%3D%201.26%20%2A10%5E%7B-27%7D%20mol%2FL)
From above
mole of
is equal to 1 L
Then x mole of
will be equal to 1000 L
Therefore
![x = \frac{1.26*10^{-27} *1000}{1}](https://tex.z-dn.net/?f=x%20%3D%20%20%5Cfrac%7B1.26%2A10%5E%7B-27%7D%20%2A1000%7D%7B1%7D)
=>
Now the number of
ions are in 1000 L of the solution is mathematically represented as
![A = x * \frac{N_A}{1 mole}](https://tex.z-dn.net/?f=A%20%20%3D%20x%20%2A%20%5Cfrac%7BN_A%7D%7B1%20mole%7D)
Where
is the avogadro's constant which has a value of
![N_A = 6.022*10^{23} \ ions](https://tex.z-dn.net/?f=N_A%20%3D%20%206.022%2A10%5E%7B23%7D%20%5C%20ions)
Substituting value
![A = 1.26 *10^{-24} * \frac{6.022 *10^{23}}{1}](https://tex.z-dn.net/?f=A%20%3D%20%201.26%20%2A10%5E%7B-24%7D%20%2A%20%5Cfrac%7B6.022%20%2A10%5E%7B23%7D%7D%7B1%7D)
![A = 0.7588\ ions](https://tex.z-dn.net/?f=A%20%3D%20%200.7588%5C%20%20ions)
Answer:
3
Explanation:
you must multiply everything out till everything is equal on both sides