Answer:
A, or the second answer: "The molecule has a trigonal planar electron domain geometry with one lone pair."
Explanation:
The trigonal pyramidal molecular shape is formed when three bonds and one lone pair are on the central atom in the molecule.
Answer:
The addition of a strong acid like HCl to an aqueous solution would result in the decreasing of pH. Solution becomes more acidic.
Explanation:
HCl dissociates in water as this:
HCl → H⁺ + Cl⁻
Imagine and aqueous solution of NaCl where you have:
NaCl → Na⁺ + Cl⁻
2H₂O ⇄ H₃O⁺ + OH⁻
The addition of HCl would increase the [H₃O⁺]
2H₂O ⇄ H₃O⁺ ↑ + OH⁻
If the [H₃O⁺] is higher, the pH would be lower so the solution would be more acidic
Answer:
molar mass of nicotine will be 162.16g/mol
Explanation:
The mass of nicotine taken = 0.60g
The volume of solution = 12mL
the osmotic pressure of solution = 7.55 atm
Temperature in kelvin =298.15K (25+ 273.15)
The formula which relates osmotic pressure and concentration (moles per L) is:
π = MRT
Where
π = osmotic pressure (unit atm) = 7.55 atm
M = molarity (mol /L)
T= temperature = (K) = 298.15 K
R = gas constant = 0.0821 L atm /mol K
Putting values
Therefore
Molarity is moles of solute dissolve per litre of solution
The volume of solution in litre = 0.012 L
we know that
molar mass =
Answer:
Option (B)
Explanation:
Crystals are usually defined as those substances that are comprised of atoms, ions, and molecules, and they are oriented in a very well-developed and ordered microscopic structure. These crystals are interlinked to one another by strong chemical bonds, namely the metallic, covalent, ionic and Vander Waals bond. In nature, these crystals form when any liquid undergoes cooling and solidifies.
The study of crystals is commonly known as crystallography and is directly associated with the minerals.
Thus, the correct answer is option (B).