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kaheart [24]
3 years ago
6

Balancing chemical reactions is consistent with which scientific law?

Chemistry
1 answer:
guajiro [1.7K]3 years ago
8 0

Answer:

Balancing chemical reactions is consistent with Lavoisier's law of conservation of mass.

Explanation:

When a chemical reaction happens, involves the exchange of electrons between the different elements inside the compounds that participate in the reaction.

But the elements themselves (that form the compounds) are not affected , so the elements that are after the reaction should be the same ones that before it happens.

Therefore the total mass of an element (sum of the mass of all the atoms of an element that appears before the reaction) should be the same as the total mass of the element after the reaction. And this should be true for each element.

Lets take this example of a balanced chemical reaction

N_{2}+ 3H_{2} -> 2NH_{3}

the number of N atoms at the beggining is 2 ( 2 N atoms attached to themselves) and after the reaction are 2 N also ( each one bonded to an ammonia molecule)

The same should happen with H : 3 gas molecules x 2 atoms of H per gas molecule (H2) = 6 and after the reaction 2 ammonia molecules x 3 atoms of H per ammounia molecule = 6

The equation is balanced only when all the elements are balanced

Note: Strictly speaking, the sum of energy and mass is conserved. But the correction is so insignificant for chemical reactions that in the majority of cases is not taken into account.

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Se construye una pila galvánica con una barra de cobre sumergida en una disolución 1M de cationes Fe+2 y una barra de plata sume
pashok25 [27]

Answer:

El potencial celular estándar, E_{cell} is +0.46 V

Explanation:

Las reacciones de media célula son;

Media reacción del ánodo Cu²⁺ + 2e⁻ ↔ Cu, E ° = 0.34 V

Media reacción catódica 2Ag + 2e⁻ ⁻ 2Ag, E ° = 0.80 V

Sin embargo tenemos para hierro Fe²⁺ + 2e⁻ ↔ Fe, E ° -0.44 V

y Fe³⁺ + e⁻ ↔ Fe²⁺, E ° = 0.77 V

 que es más alta que la del cobre presente, por lo tanto, el cobre se oxidará en el ánodo

Por lo tanto, en el ánodo, tendremos

Cu → Cu²⁺ + 2e⁻ (E ° = -0.34 V)

En el cátodo

2Ag + 2e⁻ → 2Ag (E ° = 0.80 V)

E_{cell} = E_c + E_a = -0.34 + 0.8 = +0.46 \, V

El potencial celular estándar, E_{cell} = +0.46 V

4 0
3 years ago
When Truman walks across the tile floor in his kitchen, the sound of his shoes is loud and sharp. Which of the following best de
Alexxx [7]

Answer:

Soft and quiet

Explanation:

6 0
3 years ago
In the reaction N2O4(g) 2NO2(g), what changes in color would you expect as pressure is increased at constant temperature?
skelet666 [1.2K]

Answer:

Brown color of the solution decreases

Explanation:

NO_2 is brown in color whereas N_2O_4 is colorless.

Equilibrium reaction between NO_2 and N_2O_4 is as follows:

2NO_2\leftrightharpoons N_2O_4

As per the Le Chatelier's principle, if pressure of a equilibrium is increased, the equilibrium will shift in the direction having fewer no. of moles of gases.

In the given equilibrium, NO_2 side has more no. of moles. So on increasing pressure, equilibrium will shift towards the side of N_2O_4 or more formation of N_2O_4 will take place.

Therefore, more NO_2 will decompose that will decrease the brown color of the solution as N_2O_4 is colorless.

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3 years ago
Particles that are smaller and have ____ generally dissolve faster.(1 point)
saw5 [17]

Answer:

For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

Explanation:

7 0
3 years ago
Read 2 more answers
3) How many micrograms are found in 9.12 x 10-5 L of Water?
Ann [662]

Answer:

86.2 or 431/5

Explanation:

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6 0
3 years ago
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