Answer:
c.11.43 g of aluminum hydroxide
Explanation:
These are all hormones secreted by the gastro intestinal tract.
The motion becomes smaller. Lets tale the example of water. At gaseous state, the particles moves rapidly in all directions. As it is cooled, it becomes liquid and the motion becomes smaller because the particles are now closer to each other as the attraction forces becomes stronger. As it is cooled further, it becomes solid. At solid state, the particles now vibrate in fixed position. Apply this concept to motion of molecules in a substance.
Answer:
The freezing point of chloroform (CHCl₃) in presence of benzene = - 64.252 °C.
Explanation:
- We can solve this problem using the relation:
ΔTf = Kf.m,
Where, ΔTf is the elevation of freezing point,
Kf is the freezing point depression constant <em>(Kf of chloroform = 4.7 °C/m)</em>,
m is the molality of the solution.
- We can get the molality of benzene from the relation:
m = (mass / molar mass) solute (benzene) x (1000 / mass of solvent (CHCl₃))
m = (1.25 g / 78.11 g/mol) x (1000 / 100.0 g) = 0.160 m.
ΔTf = Kf.m = (4.70 °C/m) (0.160 m) = 0.752 °C.
∴ The freezing point in presence of benzene = The freezing point of pure CHCl₃ - ΔTf = - 63.50 °C – 0.752 °C = - 64.252 °C.
Answer:
A. NaOH.
Explanation:
The pH of the solution = 6.8.
- The pH of the solution increases as the basicity of the solution increases.
- The basicity of the solution will increase by adding bases that have the ability to produce OH⁻.
So, NaOH and NH₃ "bases" will increase the pH of the solution.
while, HCl and HNO₃ "acids" will increase the acidity of the solution, thus pH will decrease.
But, NaOH will increase the pH of the solution the most because it is dissociates completely to OH⁻ , while NH₃ is weakly ionized "does not dissociate completely".
<em>So, NaOH will increase the pH the most when added to the solution.</em>
