The correct answer is 2. Magnetic fields must start at the north pole of a magnet and end at the south pole of a magnet. I took the test. Hope I helped!
Answer:20
Explanation:because you have to devide
Answer:
Into seven sections based on frequency
Explanation:
There are 7 em spectrums from radio waves, to infrared waves, to gamma rays listest in order from lowest to highest frequency.
Answer: since it has a very reactive sulfhydryl group at its side chain. This puts cysteine in special position that cannot be replaced or substituted by any other amino acid. Because disulfide bridges formed by cysteine residues are permanent component of protein primary structure.
Explanation:
This problem is describing the equilibrium whereby hydrofluoric acid decomposes to hydrogen and fluorine gases at 298 K whose equilibrium constant is 8.70x10⁻³, the equilibrium concentrations of all the reactants are both 1.33x10⁻³ M and asks for the initial concentration of hydrofluoric acid which turns out to be 2.86x10⁻³ M.
Then, we can write the following equilibrium expression for hydrofluoric acid once the change,
, has taken place:
![[HF]=[HF]_0-2x](https://tex.z-dn.net/?f=%5BHF%5D%3D%5BHF%5D_0-2x)
Now, since both products are 1.33x10⁻³ M we infer the reaction extent is also 1.33x10⁻³ M, and thus, we can calculate the equilibrium concentration of HF via the law of mass action (equilibrium expression):
![8.70x10^{-3}=\frac{(1.33x10^{-3} M)^2}{[HF]} }](https://tex.z-dn.net/?f=8.70x10%5E%7B-3%7D%3D%5Cfrac%7B%281.33x10%5E%7B-3%7D%20M%29%5E2%7D%7B%5BHF%5D%7D%20%7D)
![[HF]=\frac{(1.33x10^{-3} M)^2}{8.70x10^{-3}} }=2.03x10^{-4}M](https://tex.z-dn.net/?f=%5BHF%5D%3D%5Cfrac%7B%281.33x10%5E%7B-3%7D%20M%29%5E2%7D%7B8.70x10%5E%7B-3%7D%7D%20%7D%3D2.03x10%5E%7B-4%7DM)
Finally, the initial concentration of HF is calculated as follows:
![[HF]_0=[HF]+2x=2.033x10^{-4}+2*(1.33x10^{-3})=2.86x10^{-3}M](https://tex.z-dn.net/?f=%5BHF%5D_0%3D%5BHF%5D%2B2x%3D2.033x10%5E%7B-4%7D%2B2%2A%281.33x10%5E%7B-3%7D%29%3D2.86x10%5E%7B-3%7DM)
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