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dlinn [17]
3 years ago
15

What is not a resourse that can be used to help meet our energy needs?

Chemistry
1 answer:
Vlad1618 [11]3 years ago
6 0
Plants trees, water and dirt
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miss Akunina [59]
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A mixture of hept-1-yne, hept-2-yne, and hept-3-yne was hydrogenated in the presence of a platinum catalyst until hydrogen uptak
arsen [322]

Answer:

Only one seven carbon hydrocarbon was produced.

Explanation:

  • Alkynes are reduced completely in presence of Pt/H_{2} to produce alkanes.
  • Hydrogenation in presence of Pt is a simple nucleophilic addition process where H_{2} molecule adds onto an unsaturated bond.
  • Hept-1-yne, hept-2-yne and hept-3-yne are constitutionally isomeric to each other. Hence, after complete reduction, all three alkynes produced heptane as only product.
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4 0
2 years ago
A minimumenergy of 7.21x10-19 J is required to produce the photoelectric effect in chromium metal.
forsale [732]

Answer:

<em>2.085 x 10^-20 J</em>

<em></em>

Explanation:

minimum energy required to produce photoelectric effect in chromium is given as hf =  7.21 x 10^-19 J

The work function of chromium Ф = 4.37 eV = 7.00151 x 10^-19 J

The minimum energy required to eject an electron from from a chromium metal E = ?

From E = hf - Ф

substituting values, we have

E = (7.21 x 10^-19) - (7.00151 x 10^-19)

E = <em>2.085 x 10^-20 J</em>

7 0
3 years ago
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If the products contain 3 nitrogen atoms, then so did the reactants since overall mass is conserved in a chemical reaction.
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2 years ago
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I think the answer would be True

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