The atomic number of the product decrease by one in the d) positron emission and the e) electron capture radioactive decay. These radioactive decays are two of three common forms of the Beta Decay which occurred when the proton released a positron and a neutron emitted an electron<span>. The Beta Decay can increase or decrease the atomic number.</span>
Answer:
Precipitation will occur after the concentration of fluoride ions exceeds 0.01 M.
4 mL volume of NaF must be added to cause 
to precipitate.
Explanation:
Concentration of barium ions = ![[Ba^{2+}]=0.016 M](https://tex.z-dn.net/?f=%5BBa%5E%7B2%2B%7D%5D%3D0.016%20M)
Volume of barium ion solution = 2.0 L
The solubility product of the barium fluoride = 
![K_{sp}=[Ba^{2+}][F^-]^2](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%5BBa%5E%7B2%2B%7D%5D%5BF%5E-%5D%5E2)
![1.6\times 10^{-6}=[0.016 M]\times [F^-]^2](https://tex.z-dn.net/?f=1.6%5Ctimes%2010%5E%7B-6%7D%3D%5B0.016%20M%5D%5Ctimes%20%5BF%5E-%5D%5E2)
![[F^-]=0.01 M](https://tex.z-dn.net/?f=%5BF%5E-%5D%3D0.01%20M)
Precipitation will occur after the concentration of fluoride ions exceeds 0.01 M.
Concentration of fluoride ion = 
Volume of solution = 
Concentration of NaF solution added = 
Volume of NaF solution added = 
1 L = 1000 mL
0.004 L = 0.004 × 1000 mL = 4 mL
4 mL volume of NaF must be added to cause to precipitate.
Answer:
See Explanation
Explanation:
Positional Energy for electron as function of principle energy level (n)
=> Eₙ = -A/n²; A = 2.18x10⁻¹⁸J
Positional Energy for electron in n=2 => E₂ = -2.18x10⁻¹⁸/(2)² = -5.45x10⁻¹⁹J
Positional Energy for electron in n=3 => E₃ = -2.18x10⁻¹⁸/(3)² = -2.42x10⁻¹⁹J
ΔE(n=3→2) = -5.45x10⁻¹⁹J - (-2.42x10⁻¹⁹J) = -3.03x10⁻¹⁹J
Liquid crystal molecules have very unique structures, allowing them to be highly affected by electric fields, changing their orientation in the liquid crystal structure. This is why they are used in LCD screens. They are also highly sensitive to changes in temperature. Therefore the answer is C.
Hope this helps!
Answer:
284.48 g/mol
Explanation:
You can find the molar mass of any molecule by looking at a periodic table and adding up all of the masses of each element. When you do this with stearic acid, you get somewhere around 284.5 g/mol. Hope this helped!
