Answer:what are the options????
Explanation:
Answer:
A.
Explanation:
Warmer temperatures can also lead to a chain reaction of other changes around the world. That's because increasing air temperature also affects the oceans, weather patterns, snow and ice, and plants and animals. The warmer it gets, the more severe the impacts on people and the environment will be.
From the balanced chemical equation,
4Fe + 3O₂ --> 2Fe₂O₃
it is evident that for every 4 moles of Fe (iron), 2 moles of iron (III) oxide will be formed. Using the same ratio,
8 moles of iron x (2 moles Fe₂O₃ / 4 moles of Fe)
= 4 moles Fe₂O₃
Therefore, the answer is 4 moles.
Answer:
A pH scale reading 13 indicates a strong base.
Explanation:
From my understanding:
1 -4 is a strong acid
4 - 7 is weak acid
7 - 9 is a weak base
9 - 14 is a strong base
Answer:
A. 1.62
B. 0.513
C. 0.162.
Explanation:
pH = pKa + log [ HPO42-] / [H2PO4-]
Assuming, pKa is 7.21
Ka = 6.2 x 10^-8
pKa = 7.21
A.
7.0 = 7.21 + log [HPO42-] / [HPO4-]
- 0.21 = log [ HPO42-] / [H2PO4-]
[ HPO42-] / [ H2PO4-] = 10^-0.21
= 0.617
[H2PO4-] / [HPO42-] = 1 / 0.617
= 1.62
B.
7.5 = 7.21 + log [HPO42-] / [H2PO4-]
0.29 = log [HPO42-] / [H2PO4-]
[HPO42-] / [H2PO4-] = 10^0.29
= 1.95
[H2PO4-] / [HPO42-] = 1/1.95
= 0.513
8.0 = 7.21 + log [HPO42-] / [ H2PO4-]
0.79 = log [HPO42-] / [H2PO4-]
[HPO42-] / [H2PO4-] = 10^0.79
= 6.17
[H2PO4-] / [HPO42-] = 1/6.17
= 0.162
