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sveta [45]
4 years ago
13

What is the primary source of energy for most ecosystems

Chemistry
2 answers:
Aleonysh [2.5K]4 years ago
8 0
Sun is the primary source of energy.
gregori [183]4 years ago
6 0
 The Sun<span> is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, </span>algae<span>, and cyanobacteria use the energy from </span>sunlight<span> to make organic matter from </span>carbon dioxide<span> and water.

</span>
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Which laws can be combined to form the ideal gas law?
ahrayia [7]
Answer: Charles's law, Avogadro's law andd Boyle's law.

Charles law states the constant ratio of volume to temperature, at constant pressure. Boyle's law states the constat product of pressure and volumen at constant temperature. Avogadro's law states that equal volumes of gases at the same temperature and pressure have equal number of particles.

So, all those three laws combined state the relation of pressure, volume, temperature and number of particles of a gas, which is what the ideal gas law does: PV = n RT.
4 0
4 years ago
Read 2 more answers
Determine total H for bonds broken and formed, the overall change in H, and the final answer with units. Is it ENDOthermic or EX
Mrac [35]
  • E(Bonds broken) = 1371 kJ/mol reaction
  • E(Bonds formed) = 1852 kJ/mol reaction
  • ΔH = -481 kJ/mol.
  • The reaction is exothermic.
<h3>Explanation</h3>

2 H-H + O=O → 2 H-O-H

There are two moles of H-H bonds and one mole of O=O bonds in one mole of reactants. All of them will break in the reaction. That will absorb

  • E(Bonds broken) = 2 × 436 + 499 = 1371 kJ/mol reaction.
  • ΔH(Breaking bonds) = +1371 kJ/mol

Each mole of the reaction will form two moles of water molecules. Each mole of H₂O molecules have two moles O-H bonds. Two moles of the molecule will have four moles of O-H bonds. Forming all those bond will release

  • E(Bonds formed) = 2 × 2 × 463 = 1852 kJ/mol reaction.
  • ΔH(Forming bonds) = - 1852 kJ/mol

Heat of the reaction:

  • \Delta H_{\text{rxn}} = \Delta H(\text{Breaking bonds}) + \Delta H(\text{Forming bonds})\\\phantom{ \Delta H_{\text{rxn}}} = +1371 + (-1852) \\\phantom{ \Delta H_{\text{rxn}}} = -481 \; \text{kJ} / \text{mol}

\Delta H_{\text{rxn}} is negative. As a result, the reaction is exothermic.

3 0
3 years ago
In a motion diagram the size of the object must be less than the distance moved t or f
KATRIN_1 [288]
The awnser is false.
6 0
3 years ago
Read 2 more answers
Explain the difference between percent abundance and relative abundance.
larisa86 [58]
<span>Relative abundance - comparison between the isotopes Percent abundance -
</span><span>comparing the totals.
</span>relative abundance:the number of organisms of a particular kind as a percentage of the total number of organisms of a given area or community; the number of birds of a particular species as a percentage of the total bird population of a given area percent:figured or expressed on the basis of a rate or proportion per hundred (used in combination with a number in expressing rates of interest, <span>proportions, etc.</span><span>

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8 0
3 years ago
3. A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressures of the three
VikaD [51]

Answer:

35.0 atm + 5.0 atm + 25.0 atm = 65 atm

Explanation:

Partial pressure + Partial pressure + Partial pressure = Total pressure

5 0
3 years ago
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