A. Zn²⁺
<h3>Further explanation</h3>
Given
Cations of several elements
Required
The least to be reduced
Solution
If we look at the voltaic series:
<em>Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au </em>
The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)
The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)
Or you can look at the standard reduction potential value of the metals in the answer options, and the most negative reduction E° value which will be difficult to reduce.
The Zn metal is located far left of the other metals in the answer choices, so it is the most difficult to reduce
<h3>
Answer:</h3>
= 8.9 kg
<h3>
Explanation:</h3>
The pumpkin weighs 314 ounces
We want to calculate weight in kilograms
1 ounces is equivalent to 0.02835 kg
Therefore;
314 ounces will be equivalent to;
= 314 ounces × 0.02835 kg
= 8.902 kg
= 8.9 kg (2 d.p.)
Therefore; the mass of the pumpkin in kilograms is 8.9 kg
Answer:
747.5 mL
Explanation:
Assuming ideal behaviour, we can solve this problem by using <em>Boyle's law</em>, which states that at constant temperature:
Where in this case:
We <u>input the data given by the problem</u>:
- 681 mm Hg * V₁ = 991 mm Hg * 513.7 mL
And <u>solve for V₁</u>:
700 mL ....................