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fredd [130]
3 years ago
9

Name an element that has the same number of electron energy levels as Calcium (Ca)?

Chemistry
1 answer:
Lerok [7]3 years ago
6 0

Answer:

aluminum?

Explanation:

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Which lab safety rule do you think is the most important to follow in chemistry lab?
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Answer:

Practice good personal hygiene. Wash your hands after removing gloves, before leaving the laboratory, and after handling a potentially hazardous material. While working in the laboratory, wear personal protective equipment - eye protection, gloves, laboratory coat - as directed by your supervisor.

Explanation:

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If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem, what would
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When reversing a given reaction, we simply change the sign of the standard enthalpy change value. Therefore, the reaction will become:
H₂O → H₂ + 0.5O₂, ΔH = 286kJ
This is because if a certain amount of energy is released when a reaction occurs, the same amount of energy must be supplied for the reaction to occur in the reverse direction.
4 0
3 years ago
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What are the top 2 risk Maryland faces due to climate change
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Maryland is a Mid-Atlantic state in the United States that is characterized by abundant waterways and coastlines.

The effects of climate change in Maryland include rising sea levels, summer heat waves, and more frequent and violent thunderstorms.

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6 0
3 years ago
A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.25 grams of aluminum foil in a solut
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Answer: About 0.20 grams of copper (II) is formed, and some aluminum is left in the reaction mixture

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3 years ago
El pH de una solución acuosa 10^-14 M de ácido acético, a 25°C, es igual a, teniendo en cuenta que Ke = 1.76x10^-5
frez [133]

Answer:

pH=14

Explanation:

Hola!

En este caso, consideramos que la disociación de ácido acético ocurre:

CH_3COOH\rightarrow CH_3COO^-+H^+

Así, mediante la solución del equilibrio ácido, podemos calcular la concentración de iones hidronio que posteriormente sirven para calcular el pH de la solución, por tal razón, debemos calcular el equilibrio dada la constante de equilibrio y por medio de la ley de acción de masas en términos del cambio x como cualquier problema de equilibrio:

Ke=\frac{CH_3COO^-][H^+]}{[CH_3COOH]}\\\\1.76x10^{-5}=\frac{x*x}{1x10^{-14}M-x}

Resolviendo para x, tenemos x=0.999x10^{-14}

Así, la concentración de hidrógeno es igual a x, por lo que el pH:

pH=-log([H^+])=-log(0.999x10^{-14})\\\\pH=14

Dicho valor tiene sentido desde que la concentración de hidrógeno es casi despreciable, por lo que se puede asumir que tiende a ser básica.

Saludos!

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3 years ago
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