Helium has an atomic number 2 and an atomic weight of 4 grams per mole. It is one of the noble gas (which means that it is stable) and also a nonmetal. Its electron configuration is 1s2. There are energy levels and they are s, p, d and f. The s level means that its maximum number of electrons is only 2.
An electrode is strip of metal on which the reaction takes place<span>. In a </span>voltaic cell, theoxidation<span> and reduction of metals occurs at the electrodes. There are two electrodes in a </span>voltaic cell, one in each half-cell<span>. The cathode is where reduction </span>takes place<span>and </span>oxidation takes place<span> at the anode.
So, the answer is A. anode
Hope this helps:-)
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The answer is b. hot spots
Are you referring to this question?
<span>When the pentaacetate anomer is heated with ZnCl2 and acetic anhydride, it is converted into the other anomer. Explain why it occurs.</span>
If so, then the answer would be:
Glucose Pentaacetate is prepared through the acetylation of glucose with acetic anhydride.
Alpha-anomer is produced when acidic catalyst is present like zinc chloride. On the other hand, beta-anomer is formed when a basic catalyst is present, like sodium acetate.
Answer:
1.016 seconds
Explanation:
Let's bring out the parameters we were given in the question;
Rate constant k = 0.710 s^-1
Initial Concentration [A] = 0.820 M
Final concentration [A]o = 0.290 M
Time t = ?
Formular relating these parameters is given as;
ln[A] = ln[A]o − kt
Making t subject of interest, we have;
ln[A] - ln[A]o = -kt
kt = ln[A]o - ln[A]
t = (ln[A]o - ln[A]) / k
Substituting the values, we have;
t = ( ln(0.820) - ln(0.290) ) / 0.710
t = 0.7217 / 0.710
t = 1.016 seconds
