Answer:
The correct answer is A an ionic bond is a bond between charged atoms,while a covalent bond is a bond between neutral atoms.
Explanation:
Ionic bond is formed between two atom that have huge difference in their electronegativity.The one atom loses electron thus becomes positively charged another atom receives that electron thus becomes negatively charged.
For example NaCl
Covalent bond is formed by the sharing and paring of electrons.
For example H2O
The classical bonding model which best explains the bonding in the compound NaH₂PO₄ is Hydrogen bonding.
<h3>What is Classical bonding model ?</h3>
By classical, we mean models that do not take into account the quantum behavior of small particles, notably the electron.
These models generally assume that electrons and ions behave as point charges which attract and repel according to the laws of electrostatics.
Sodium dihydrogen phosphate (NaH₂PO₄) is monoclinic, In which, the four independent hydrogen atoms were located on a difference map; they are involved in four O … O Hydrogen-bonds of length 2.654 (2), 2.589 (2), 2.559 (2), and 2.500 (2) Å.
The short contact (2.500 Å), which is not astride any symmetry element, is of the type O-H … O (asymmetrical).
The distorted coordination polyhedra of the sodium atoms are discussed in the light of recent theories on electrostatic balance.
Hence, the classical bonding model which best explains the bonding in the compound NaH₂PO₄ is Hydrogen bonding.
Laern more about Bonding model here ;
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Answer:
1. Decrease the pH
2. The pH remains unchanged
3. Decrease the pH
Explanation:
We can calculate the pH of a weak acid using the following expression:
![pH=-log [H^{+} ]=-log\sqrt{Ka \times Ca }](https://tex.z-dn.net/?f=pH%3D-log%20%5BH%5E%7B%2B%7D%20%5D%3D-log%5Csqrt%7BKa%20%5Ctimes%20Ca%20%7D)
[1]
where,
Ka is the acid dissociation constant
Ca is the initial concentration of the acid
<em>State whether each of the following would increase, decrease, or leave the initial pH unchanged and explain your reasoning</em>
- <em>Using the same weak acid, but having a higher concentration. </em>According to eq. [1], a higher Ca leads to a higher [H⁺] and a lower pH.
- <em>Using 80.00 mL of this weak acid instead of 40.00 mL.</em> pH refers to a concentration, which is an intensive property, so it does not change when we change the amount of matter.
- <em>Using a different weak acid that has a larger Ka value.</em> According to eq. [1], a higher Ka leads to a higher [H⁺] and a lower pH.
Formula: molality, m = n solute / kg solvent
n solute = # of moles of solute = mass(g) / molar mass
Molar mass of Mg Br2 = 184.11 g/mol
m = [46g / 184.11 g/mol] / 0.5 kg = 0.50 mol/kg
Density = mass / volume
1.5 = m / 50.0
m = 1.5 x 50.0
m = 75 g
hope this helps!
