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3 years ago

. Consider the following half-reactions:

Chemistry

1 answer:

Vedmedyk [2.9K]3 years ago

7 0

d. Fe(s) and Al(s)

<h3>Further explanation</h3>

In the redox reaction, it is also known

Reducing agents are substances that experience oxidation

Oxidizing agents are substances that experience reduction

The metal activity series is expressed in voltaic series

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent

So that the metal located on the left can push the metal on the right in the redox reaction

The electrodes which are easier to reduce than hydrogen (H), have E cells = +

The electrodes which are easier to oxidize than hydrogen have a sign E cell = -

So the above metals or metal ions will reduce Pb²⁺ (aq) will be located to the left of the Pb in the voltaic series or which have a more negative E cell value (greater reduction power)

The metal : d. Fe(s) and Al(s)

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A mathematical equation is an example of:

Mazyrski [523]

Answer:

The correct answer is A scientific law.

Explanation:

Maximum scientific law has mathematical expression such as charles law,boils law,culombs law,newtons law,first and second law of thermodynamics,ficks law

Mathetical expression of scientific law helps to understand the parameters related to that law and makes the law easy to understand because if the mathematical expression of a scientific law is known to us then from the mathematical expression we can dictate the law.

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4 years ago

Whats the ph of water

Sindrei [870]

Answer:

Explanation:

The pH of water is 7.

pH is the convenient scale for expressing the level of acidity or alkalinity of aqueous solutions.

An acidic solution has a pH value less than 7.

As pH decreases, the acidity of solutions increases.

Neutral solutions have a pH of 7.

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Water has a pH of 7 because the concentration of hydrogen and hydroxyl ion is equal.

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3 years ago

Using dimensional analysis, how many seconds are in 1.2 days?

julsineya [31]

Answer:

103,680 seconds

Explanation:

1.2 days x $\frac{24 hours}{1 day} \frac{60 minutes}{1 hour} \frac{60 seconds}{1 minute}$

(1.2)(24)(60)(60) = 103,680 seconds

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3 years ago

Calculate ΔH∘f (in kilojoules per mole) for benzene, C6H6, from the following data: 2C6H6(l) + 15O2(g)→12CO2(g)+6H2O(l) ΔH∘=−653

Pachacha [2.7K]

Answer: 48.6 kJ/mol

Explanation:

The balanced chemical reaction is,

$2C_6H_6(l)+15O_2(g)\rightarrow 12CO_2(g)+6H_2O(l)$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_6H_6}\times \Delta H_{C_6H_6})]$

where,

n = number of moles

$\Delta H_{O_2}=0$ (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

$-6534.0=[(12\times -393.5)+(6\times -285.8)]-[(15\times 0)+(2\times \Delta H_{C_6H_6})]$

$\Delta H_{C_6H_6}=48.6kJ/mol$

Therefore, the enthalpy change for benzene is 48.6 kJ/mol

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3 years ago

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4 years ago