Answer:
Below :))
Explanation:
I would suggest having a space/rocket theme, which fits your project.
What you do really depends on how much you want to put into it.
If its a black board, you could draw/make rockets to put on the board, and some planets. You could also make/draw some baking soda and vinegar bottles/cans. From what I have done, I have pictures/writing to put on the board. I suggest priting these if you have them, and putting them around the board. You should probably put theses on first, and then draw/make things to put on the board afterward.
Hope this gives you some ideas, if not though, comment down below and I can help more!
Answer:
The charge of cobalt in the salt is + 2.
Explanation:
The charge of the salt = 0 . This is because it is neutral.
Charge of cobalt = ?
Charge of oxygen = -2 (This is a constant value, it is -2 only in peroxides)
Charge of salt = Charge of cobalt + Charge of oxygen
0 = x + (-2)
x = + 2
The charge of cobalt in the salt is + 2.
Answer:
= 4
Explanation:
The pH of a solution is given by;
pH = - log [H+] , while
pOH = - log [OH-]
But; pH + pOH = 14
Therefore;
pH = 14 - pOH
= 14 - 10
= 4
2,8,1
It's in group 1, so its outershell only has 1 electron, and the other shells are completely filled, so 2 then 8. :)
Answer:
The molecular weight is ![Z = 111.2 \ g/mol](https://tex.z-dn.net/?f=Z%20%3D%20%20111.2%20%5C%20g%2Fmol)
Explanation:
From the question we are told that
The mass of the sample is ![m = 0.98 \ g](https://tex.z-dn.net/?f=m%20%3D%20%200.98%20%5C%20%20g)
The temperature is ![T = 348 K](https://tex.z-dn.net/?f=T%20%20%3D%20%20348%20K)
The volume which the gas occupied is ![V = 265 \ ml = 265 *10^{-3} L](https://tex.z-dn.net/?f=V%20%20%3D%20%20265%20%5C%20ml%20%20%3D%20265%20%2A10%5E%7B-3%7D%20L)
The pressure is ![P = 0.95 \ atm](https://tex.z-dn.net/?f=P%20%20%3D%20%200.95%20%5C%20%20atm)
Generally from the ideal gas equation we have that
![PV = n RT](https://tex.z-dn.net/?f=PV%20%20%3D%20%20n%20RT)
Here n is the number of moles of the gas while the R is the gas constant with value ![R = 0.0821 \ atm \cdot L \cdot mol^{-1} \cdot K^{-1}](https://tex.z-dn.net/?f=R%20%20%3D%20%200.0821%20%5C%20atm%20%5Ccdot%20L%20%20%5Ccdot%20mol%5E%7B-1%7D%20%5Ccdot%20K%5E%7B-1%7D)
![n = \frac{PV}{ RT}](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7BPV%7D%7B%20RT%7D)
=> ![n = \frac{ 0.95 * 265 *10^{-3} }{ 0.0821 * 348}](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7B%200.95%20%2A%20265%20%2A10%5E%7B-3%7D%20%7D%7B%20%20%200.0821%20%2A%20348%7D)
=> ![n = 0.00881 \ mol](https://tex.z-dn.net/?f=n%20%3D%200.00881%20%5C%20%20mol)
Generally the molecular weight is mathematically represented as
![Z = \frac{m}{n}](https://tex.z-dn.net/?f=Z%20%3D%20%20%5Cfrac%7Bm%7D%7Bn%7D)
=> ![Z = \frac{0.98 }{0.00881}](https://tex.z-dn.net/?f=Z%20%3D%20%20%5Cfrac%7B0.98%20%7D%7B0.00881%7D)
=> ![Z = 111.2 \ g/mol](https://tex.z-dn.net/?f=Z%20%3D%20%20111.2%20%5C%20g%2Fmol)