The characteristics that photosynthesis and combustion share are a] They both involve chemical change. b] They are both endothermic. c] They both start with chemical energy. d] They both occur in living organisms.
Answer:
7 moles
Explanation:
Given data:
Moles of hydrogen = 7 mol
Moles of water formed = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of water with hydrogen from balance chemical equation:
H₂ : H₂O
2 : 2
7 : 7
So in the presence of excess oxygen and 7 moles of hydrogen seven number of moles of water produced.
Answer:
The functional group
Explanation:
A functional group defines a hydrocarbon. an ester the functional group is an O- alkyl group while that one of an alcohol is -OH group. An aldehyde is a functional group on its own.
<span>1) The electron configuration of Re is [Xe] 4f14 5d5 6s2
</span>
<span>The ion Re (3+) has lost 3 electrons, so its configuration is </span><span>[Xe] 4f14 5d4
</span>
Then, the number outer-shell d electrons is 4.
<span>2) Sc: [Ar] 3d1 4s2
</span>
Sc (3+) has lost 3 electrons -> <span>[Ar] which has not d electrons.
</span>
<span>Then, the number of d electrons is 0</span>
<span>3) Ru: [Kr] 4d7 5s1
</span>
Ru (4+) has lost 4 electrons -> <span>[Kr] 4d4
</span>
Then, the number of outer-shell d electrons is 4
<span>4) Hg: [Xe] 4f14 5d10 6s2
</span>
Hg (2+) has lost 2 electrons -> <span>[Xe] 4f14 5d10
</span>
<span>Then, the number of outer-shell d electrons is 10</span>