Answer:
The equivalent circuit for the electrode while the electrolyte gel is fresh
From the uploaded diagram the part A is the electrolyte, the part part B is the electrolyte gel when is fresh and the part C is the surface of the skin
Now as the electrolyte gel start to dry out the resistance of the gel begins to increase and this starts to limit the flow of current . Now when the gel is then completely dried out the resistance of the gel then increases to infinity and this in turn cut off flow of current.
The diagram illustrating this is shown on the second uploaded image
Explanation:
Answer:
The spilling of part of the salt by students while measuring the solubility of a salt will make the calculated solubility by the student to be higher than the exact value.
Explanation:
Solubility is the maximum amount in gram or moles of a particular salt that can completely dissolve in a given solvent at a particular temperature. Therefore, in calculation of the solubility is requires three major factors:
1. The amount of salt,
2. The temperature, and
3. The volume of the solvent used.
This experiment and the mistake done by this student only caused an alteration in the amount of salt used while the volume of solvent was held constant. The student would have therefore thought that she/he had added a particular amount of salt; let's say: x moles, which we should assume to be the maximum amount that can be dissolved by the given solvent at that temperature. The spilled salt will generally reduce the moles of the salt that is eventually added by let's say: y moles. Therefore, the actual amount of salt that would have been added will be x - y moles. The solvent will still have room to accommodate more salt since the solubility is constant at this unaltered temperature. The addition of more salt, let"s say: m moles to make up for the loss will make the student record x + m moles of the salt per unit volume of the solvent instead of x - y + m which was eventually added.
Therefore, since the assumed x + m moles will always be higher than the actual x + m - y moles of the salt, the recorded solubility by the student will always be higher than the actual value.
Answer:
Number of moles = 0.057 × 10⁻⁷ mol
Explanation:
Given data:
Mass of SiO₂ = 3.4 × 10⁻⁷ g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of SiO₂ = 60 g/mol
by putting values,
Number of moles = 3.4 × 10⁻⁷ g / 60 g/mol
Number of moles = 0.057 × 10⁻⁷ mol
1.50*10^23 molecules/ (6.02*10^23 molecules/mol)= 0.249 mol.
There is 0.249 mol in 1.50*10^23 molecules~
Answer:
ethylllithium: 2 stereoisomers - (R)-2,3-dimethyl-3-pentanol and (S)-2,3-dimethyl-3-pentano
methylmagnesium bromide: no stereoisomers (one compound) - 2,3-dimethyl-2-butanol
Explanation:
See the attached file for the mechanism and products.