Fe: 2+
Br: 1-
Checked on the periodic table
Answer: The correct answer is (1).
Explanation:
Concentration of the solute in 1000 g of solution: 5 parts per million
1 part per million = 1 milligram/Liter
Then , 5 parts per million = 5 mg/liter
This means that 5 milligrams of solute is present in 1 liter solution.
1 gram = 1000 milligrams
Then 5 milligram = 
= 0.005 grams
Answer : The value of 
and 
Explanation :
To calculate the equilibrium potential we are using Nernst equation:
where,
= equilibrium potential
z = valency of ion
= concentration of the ion outside the cell
= concentration of the ion inside the cell
<u>Part a :</u>
Given:
z = valency of ion 
= 2
= concentration of the ion outside the cell = 1 mM
= concentration of the ion inside the cell = 100 mM
<u>Part b :</u>
Given:
z = valency of ion 
= 1
= concentration of the ion outside the cell = 110 mM
= concentration of the ion inside the cell = 10 mM
Strong electrolytes by definition are those compounds that completely dissociates into their component ions when dissolved in water. The chemical formula for the zinc fluoride is,
ZnF2
This means that each formula unit is composed of one atom of zinc and 2 atoms of fluoride. The ions comprising the unit are Zn²⁺ and F⁻. The dissociation is as shown below,
ZnF₂ --> Zn²⁺ + 2F⁻
When dissolved in water it is expected that the compound dissociates into three different ions, one Zn²⁺ and two F⁻.
Answer:
50 g
Explanation:
d= m/v
rearranging the above equation
m = d x v
m = 2.5 g x 20 g/cm3
m = 50 g
