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kondaur [170]
2 years ago
12

What happens during all chemical changes?

Chemistry
2 answers:
3241004551 [841]2 years ago
7 0

Answer: Option (B) is the correct answer.

Explanation:

A change which brings change in composition of atoms of a substance to result in the formation of new substances is known as a chemical change.

Therefore, in a chemical change new substances are formed which have different properties as compared to their reactants.

For example, 2Na + Cl_{2} \rightarrow 2NaCl

Thus, we can conclude that during all chemical changes atoms rearrange to form new substances.

Marina86 [1]2 years ago
5 0

Answer:

Atoms rearrange to form new substances

Explanation:

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Read 2 more answers
EL hidroxido de sodio reacciona con el sulfato de hierro (II) para formar sulfato de sdio e hidroxido ferroso. Si se hace reacci
Oduvanchick [21]

Answer:

280.8 g

Explanation:

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2NaOH +  FeSO₄  →  Na₂SO₄  +  Fe(OH)₂

Como tenemos la masa de NaOH, asumimos que el sulfato de hierro (II) es el reactivo en exceso.

Definimos masa de reactivo: 250 g . 1mol / 40g = 6.25 mol

2 moles de NaOH producen 1 mol de hidroxido ferroso

Entonces 6.25 moles producirán, la mitad (6.25  . 1) /2 = 3.125 moles

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3.125 mol . 89.85 g/mol = 280.8 g

7 0
2 years ago
Se tiene una solución acuosa 2M de carbonato de potasio. Expresar su concentración en %p/v y Normalidad.
zepelin [54]

Answer:

Normalidad = 4N

%p/V = 27.6%

Explanation:

La solución 2M de carbonato de potasio contiene 2moles de carbonato por litro de solución. La normalidad son los equivalente de carbonato de potasio (2eq/mol) por litro de solución:

2moles * (2eq/mol) = 4eq / 1L = 4N

El porcentaje peso volumen es el peso de carbonato en gramos dividido en el volumen en mL por 100:

%p/V:

Masa K2CO3 -Masa molar: 138.205g/mol-

2moles * (138.205g/mol) = 276g K2CO3

Volumen:

1L * (1000mL/1L) = 1000mL

%p/V:

276g K2CO3 / 1000mL * 100

<h3>%p/V = 27.6%</h3>
6 0
2 years ago
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