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2 years ago

Which equation represents the oxidation half-reaction for this redox reaction? Ca + Al(NO3)3 → Al + Ca(NO3)2

Chemistry

2 answers:

VladimirAG [237]2 years ago

8 0

C for plato or "Ca → Ca + 2e−"

vodomira [7]2 years ago

5 0

The oxidation half reaction of the reaction given above would be: Ca → Ca + 2e−. Oxidation is the loss of electrons of an element while its counterpart is called the reduction which gains the electrons that has been lost. Hope this answers the question.

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Given the following electronic configurations, identify how many valence electrons each atom has.

ololo11 [35]

Answer : Valence electrons in atom A = 1, B = 6 and C = 2.

Explanation :

Valence electrons means the outermost electrons are the ones which involved in bonding. Electrons are arranged in energy levels or shells.

Valence electrons are found in the highest energy orbitals of an element.

The electronic configuration of (Na) is $1s^22s^22p^63s^1$ . The highest energy orbital is 3s orbital which contains 1 electron. So,

The number of valence electrons in (Na) = A = 1

Similarly,

The electronic configuration of (O) is $1s^22s^22p^4$ . The highest energy orbital are 2s and 2p orbitals which contains (2 + 4) = 6 electrons. So,

The number of valence electrons in (O) = B = 6

The electronic configuration of (Fe) is $1s^22s^22p^63s^23p^64s^23d^6$ . The highest energy orbital is 4s orbital which contains 2 electrons. So,

The number of valence electrons in (Fe) = C = 2

4 0

2 years ago

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For a stationary fluid, the pressure will vary in the x, y and z directions.T/F

solmaris [256]

Answer:

True

Explanation:

For a stationary fluid, the pressure will vary in the x, y and z directions.

5 0

3 years ago

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What is the freezing point of an aqueous solution that boils at 105.0 ∘C? Express your answer using two significant figures.

konstantin123 [22]

Answer:

T°fussion of solution is -18°C

Explanation:

We have to involve two colligative properties to solve this. Let's imagine that the solute is non electrolytic, so i = 1

First of all, we apply boiling point elevation

ΔT = Kb . m . i

ΔT = Boiling T° of solution - Boiling T° of pure solvent

Kb = ebuliloscopic constant

105°C - 100° = 0.512 °C kg/mol . m . 1

5°C / 0.512 °C mol/kg = m

9.7 mol/kg = m

Now that we have the molality we can apply, the Freezing point depression.

ΔT = Kf . m . i

Kf = cryoscopic constant

0° - (T°fussion of solution) = 1.86 °C/m . 9.76 m . 1

- (1.86°C /m . 9.7 m) = T°fussion of solution

- 18°C = T°fussion of solution

5 0

2 years ago

Cierta cantidad de hidrogeno esta encerrada en una camara de platino a volumen constante. Cuando la camara se sumerge en un baño

salantis [7]

Answer:

-245.7°C es la temperatura del gas bajo 100 torr

Explanation:

Para resolver esta pregunta debemos hacer uso de la ley de Boyle que establece que la presión de un gas es directamente proporcional a la temperatura de este cuando el volumen permanece constante. La ecuación es:

P1T2 = P2T1

<em>Donde P es presión y T temperatura absoluta del estado inicial, 1, y final, 2.</em>

<em />

Reemplazando:

P1 = 1000torr

T2 = ? -Incógnita-

P2 = 100torr

T1 = 273K -Temperatura del hielo fundido = 0°C = 273K

1000torrT2 = 100torr273

T2 = 27.3K

27.3K - 273 =

<h3>-245.7°C es la temperatura del gas bajo 100 torr</h3>

<em />

3 0

2 years ago

In the figure, which two lines appear to be parallel?

Ipatiy [6.2K]

I don’t understand. Is there a picture? Where are the options?

7 0

2 years ago

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