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Alik [6]
3 years ago
5

How does science help us protect our nations resources.

Chemistry
2 answers:
Rina8888 [55]3 years ago
5 0
Science has helped us protect our resources because today, scientists have figured out a way to predict the weather and help us prepare for any storms to come.
Helga [31]3 years ago
3 0
By showing what resources the planet had to offer
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Astamañana vaya buenas noches

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What happens to molecules when a substance is cooled?​
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causes a substance to change from a liquid to a solid.

Explanation:

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Chemicals (and humans) are all about what
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Atoms, and chemical make up

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3 years ago
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Estimate the enthalpy change for the combustion of one mole of acetylene, C2H2, to form carbon dioxide and water vapor. BE(C?H)
tia_tia [17]

Answer:

ΔH rxn =  -1010 kJ/molC₂H₂

Explanation:

To obtain the enthalpy change for a reaction from bond energies what we do is to make an inventory of the bonds broken and formed for the balanced chemical reaction:

C₂H₂ + 5/2O₂   ⇒   2CO₂ + H₂O

Bond Broken                                    Bonds Formed

2 C-H + 1 C≡C + 5/2 O=O                4C=O + 2 H-O

Enthalpy bonds broken:

2 mol (456 kJ/mol)+ 1 mol (962 kJ/mol) + 5/2 mol (499 kJ/mol)  =  3121.5 kJ

Enthalpy bond formed:

4 mol (802 kJ/mol) + 2 mol (462 kJ/mol) = 4132.0 kJ

ΔH rxn = H broken - H formed =  3121.5 kJ - 4132.0 kJ = - 1010  kJ (per mol C₂H₂ )

4 0
3 years ago
How is 0.246¯¯¯¯ written as a fraction in simplest form?
KiRa [710]
0.246 =  \dfrac{246}{1000} = \dfrac{246 \div 2}{1000 \div 2} = \dfrac{123}{500}
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3 years ago
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