True because radioactive contamination results in contact with radioactive substances
5000 cm³ (5L) of Cu(NO₃)₂ contain 10 moles
∴ 1000 cm³ of Cu(NO₃)₂ contain x moles
x = (1000 cm³ × 10 moles) ÷ 5000 cm³
∴ the concentration of the solution is2 mol/dm³ or 2 mol / L
Answer:
In an acidic solution i.e pH is lower than 7 has higher concentration of hydronium ions compare to the hydroxide ions.
Explanation:
Acidic solutions are those solutions which have pH value less than 7.
Alkaline solutions are those solution which has pH more than 7.
Neutral solutions are those solution which has pH value equal to 7.
The pH of the solution is defined as negative logarithm of hydronium ion concentration present in an aqueous solution .
![pH=-\log[H_3O^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%5BH_3O%5E%2B%5D)
![pH\propto \frac{1}{[H_3O^+]}](https://tex.z-dn.net/?f=pH%5Cpropto%20%5Cfrac%7B1%7D%7B%5BH_3O%5E%2B%5D%7D)
- Higher pH value indicates that hydronium ions present in the solution are less than the hydroxide ions.
- Lower pH value indicates that hydronium ions present in the solution are more than the hydroxide ions.
So, in an acidic solution i.e pH is lower than 7 has higher concentration of hydronium ions compare to the hydroxide ions.
Answer:
Se explanation below
Explanation:
Here we will use the technique of extraction taking advantange of the different solubilities of Phenol and and Benzoic Acid in the NaOH and and NaHCO₃ solvents (In reality their anions). Notice that phenol does not dissolve in the weak base NaHCO₃ so we can have the solution of phenol and benzoic acid in ether and proceed to extract with this weak base, the phenol will remain in solution in the organic ether solution and the sodium benzoate will go into the water layer.
We then will repeat the extraction procedure to separate the phenol from the organic layer by using NaOH instead.
Benzoic Acid /
Phenol/ Ether ⇒Extract w/ ⇒ Organic Layer = Phenol/Ether
10 % NaHCO₃ Aqueous Layer = Sodium Benzoate
Sodium benzoate ⇒ 10 % HCl to precipitate Benzoic Acid
Filter Precipitate benzoic Acid ⇒ Recrystallize benzoic Acid
Phenol / Ether Extract w/ Organic Layer = Eher
10 % NaOH Aqueous Layer =
Sodium Phenolate
Sodium Phenolate ⇒ 10% HCl to precipitate Phenol Filter Precipitate Phenol ⇒ Recrystallize Phenol
Answer:
Uniformitarianism- A theory that geologic process that occur today are similar to those that have occurred in the past
Trace Fossil- A fossil of a foot or trail or other travel of an animal rather than of the animal itself