Mendleev arranged his periodic table in order of Atomic Mass...
Answer:
Answer is attached but read below for full explanation.
Explanation:
This reaction is called Hydrolysis of Amides. Amides are carboxylic acid derivatives where the -OH of the carboxylic acid has been replaced by -NH2, -NHR, or -NR2 of an amine. Since the reaction between a carboxylic acid and an amine to give an amide also liberates water, this is an example of a "condensation reaction".
The statement that best describes a buffer is: <u>A buffer resists change in pH by accepting hydrogen ions when acids are added to the solution and donating hydrogen ions when bases are added.</u>
Why?
A buffer is a solution made by combining either:
- A weak acid (HA) and its conjugate base (A⁻).
- A weak base (B) and its conjugate acid (HB⁺)
The purpose of a buffer is to resist changes in pH when a strong acid or base is added to the solution.
If the buffer is composed of HA and A⁻ and a strong acid (e.g. HCl) is added, the buffer <u>accepts hydrogen ions</u> in the following way:
A⁻+HCl → HA+Cl⁻
If a strong base (e.g. NaOH) is added, the buffer donates hydrogen ions in the following way:
HA + NaOH → NaA + H₂O
The pH of the buffer at any given moment can be found by using the Henderson-Hasselbach equation, based on the equilibrium HA + H₂O ⇄ H₃O⁺ + A⁻
Have a nice day!
1)4
2)3
3)0
4)12
4(NH4)3 + 3Pb(NO3)4= Pb3(PO4)4 +12NH4NO3
D. There is one atom of sulfur and three atoms of oxygen.
The "tri" in trioxide indicates three so there are three atoms of oxygen. As nothing is said about the sulfur, there is just one atom.
Hope this helps!!