Answer:
Theory
Explanation:
A proved hypothesis usually becomes known as a theory.
Let's take an example. Remember the experiment for the Newton's law of universal gravitation. In an experiment like this, we should have a reference point, a hypothesis. The thought process would be, for example, to intuitively propose that the force of gravity depends on the masses of the two objects and the distance between them.
As a second step, sufficiently high number of experiments should be performed to prove this relationship with different masses and different distances to see how force correlates with the given variables.
Having noticed that the two masses are directly proportional to force and that force is inversely proportional to the square of a distance between the two objects, a proportionality constant is also found, so then we have an equation which would help us solve for the force of gravity between any two objects knowing their masses and the distance between them.
Overtime, after this hypothesis is proved analyzing substantial data, it becomes an accepted theory that can be used and applied.
Reaction of galvanic cell
<h3>Further explanation</h3>
Given
Redox reaction between Zn and Mg
Required
Half reaction
Potential of the cell
Solution
Zn²⁺ + 2e -> Zn E ° = -0.76 V
Mg²⁺ + 2e -> Mg E ° = - 2.37 V
The higher E ° of the cell will act as the positive pole/cathode
Electrode Zn as a cathode (reduction) and Mg as an anode (oxidation) (E ° of Zn cells is greater than Mg)
Half reaction
Cathode: Zn²⁺ + 2e ⇒ Zn E ° = -0.76 V
Anode: Mg ⇒ Mg²⁺ + 2e E ° = +2.37 V
------------------------------------------------- ----------- +
Cell reaction: Zn²⁺ + Mg ---> Zn + Mg²⁺ E ° cell = +1.61 V
The reaction occurs spontaneously in the absence of an electric current, thus including galvanic cells/voltaic cells
Answer:
Explanation:
1. Atomic mass of K
To get the atomic mass of K, you calculate the weighted average of the isotopic masses.
That is, you multiply the atomic mass of each isotope by a number representing its relative importance (e.g., its percent of the total).
Set up a table for easy calculation:
2. Formula mass of KF
Answer:
dimethoxy(phenyl)methanol
Explanation:
For this question, we have to remember the <u>mechanism of the Grignard reaction</u>. In this case, <u>phenylmagnesium bromide</u> is our <u>nucleophile</u>, a carbo-anion is produced (step 1). Then this <u>carbo-anion</u> can <u>attack</u> the <u>carbonyl group</u> in the <u>dimethyl carbonate</u>, the double bond is delocalized into the oxygen producing a <u>negative charge</u> (step 2). Finally, with the addition of the h<u>ydronium ion</u> (), the anion can be protonated to produce the <u>alcohol</u> (dimethoxy(phenyl)methanol) (step 3).
See figure 1
I hope it helps!