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katrin [286]
3 years ago
8

What kind of lens does a nearsighted person need

Chemistry
2 answers:
love history [14]3 years ago
5 0
Near/shortsighted people need concave lenses. I myself am nearsighted
Troyanec [42]3 years ago
5 0

I know I am 5 years late but the answer is concave lens

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The following thermochemical equation is for the reaction of Fe 3 O 4 (s) with hydrogen (g) to form iron and water vapor Fe 3 O
Mila [183]

Answer:

41.3kJ of heat is absorbed

Explanation:

Based in the reaction:

Fe₃O₄(s) + 4H₂(g) → 3Fe(s) + 4H₂O(g) ΔH = 151kJ

<em>1 mole of Fe3O4 reacts with 4 moles of H₂, 151kJ are absorbed.</em>

63.4g of Fe₃O₄ (Molar mass: 231.533g/mol) are:

63.4g Fe₃O₄ × (1mol / 231.533g) = <em>0.274moles of Fe₃O₄</em>

These are the moles of Fe₃O₄ that react. As 1 mole of Fe₃O₄ in reaction absorb 151kJ, 0.274moles absorb:

0.274moles of Fe₃O₄ × (151kJ / 1 mole Fe₃O₄) =

<h3>41.3kJ of heat is absorbed</h3>

<em />

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True or false organic protein catalysts are precipitates
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The answer is true lol
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The towed
Volgvan

B Phytoplankton - Zooplankton - Arctic cod - Ringed sal

Explanation:

The food chain that describes the path through which energy takes will be phytoplankton-zooplankton-Arctic cod-Ringed sal. Energy moves in the ecosystem from producers to primary consumers then secondary and tertiary consumers.

  • Autotrophs are those organisms that manufacture their own food. The use chemical substances from the environment to produce their nourishment which serves as the source of energy for the whole ecosystem too.
  • Autotrophs are the producers in any ecosystem and they are usually the plants.
  • The phytoplankton is an autotroph.
  • Next up are the primary consumers that takes up the produced food by the autotrophs for their own nourishment. In the chain above, the Zooplankton is the primary consumer.
  • The secondary consumer that feeds on the zooplankton is the Arctic cod.
  • The tertiary consumer is the Ringed Sal which feeds directly on the Arctic cod.

Learn more:

food chain brainly.com/question/2497487

#learnwithBrainly

4 0
3 years ago
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