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3 years ago

Magnesium is able to copper, and copper is able to magnesium.

Chemistry

1 answer:

sveticcg [70]3 years ago

4 0

Answer:

Explanation:

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized.

In given example,

Magnesium is able to reduced the copper and copper is able to oxidized the magnesium.

Zinc is able to oxidized the magnesium and magnesium is able to reduced the zinc.

Copper is able to oxidized the zinc and zinc is able to reduced the copper.

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A 55.0-kg skydiver free falls for a period of time before opening his parachute. what is his kinetic energy when he reaches a ve

morpeh [17]

The kinetic energy of a moving object is calculated through the equation,
KE = 0.5mv²
where KE is kinetic energy, m is mass, and v is the velocity. Substituting the known values in the problem above,
KE = 0.5(55 kg)(16 m/s)²
KE = 7,040 J
Thus, the kinetic energy of the skydiver is approximately equal to 7 kJ.

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3 years ago

Read 2 more answers

A 0.020 M solution of niacin has a pH of 3.26. (a) What percentage of the acid is ionized in this solution

mariarad [96]

Answer: 2.75%

Explanation:

$pH=-log [H+]$

$3.26 = -log [H+]$

$[H+] = 5.495\times 10^{-4} M$

$HA\rightleftharpoons H^++A^-$

initial 0.020 0 0

eqm 0.020 -x x x

$K_a=\frac{[H+][A-]}{[HA]}$

$K_a=\frac{[x][x]}{[0.020-x]}$

$x=5.495\times 10^{-4}$

$K_a=\frac{[5.495\times 10^{-4}]^2}{[0.020-5.495\times 10^{-4}]}$

$K_a =1.553\times 10^{-5}$

percent dissociation = $\frac{[H^+_eqm]}{[Acid_{initial}]}\times 100$

percent dissociation= $\frac{5.495\times 10^{-4}}{0.020}\times 100$

Thus percent dissociation= 2.75 %

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3 years ago

Upon adding solid potassium hydroxide pellets to water the following reaction takes place: KOH(s) → KOH(aq) + 43 kJ/mol Answer t

nekit [7.7K]

Answer:

a) Warmer

b) Exothermic

c) -10.71 kJ

Explanation:

The reaction:

KOH(s) → KOH(aq) + 43 kJ/mol

It is an exothermic reaction since the reaction liberates 43 kJ per mol of KOH dissolved.

Hence, the dissolution of potassium hydroxide pellets to water provokes that the beaker gets warmer for being an exothermic reaction.

The enthalpy change for the dissolution of 14 g of KOH is:

$n = \frac{m}{M}$

Where:

m: is the mass of KOH = 14 g

M: is the molar mass = 56.1056 g/mol

$n = \frac{m}{M} = \frac{14 g}{56.1056 g/mol} = 0.249 mol$

The enthalpy change is:

$\Delta H = -43 \frac{kJ}{mol}*0.249 mol = -10.71 kJ$

The minus sign of 43 is because the reaction is exothermic.

I hope it helps you!

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3 years ago

In 1808, John Dalton proposed a series of statements regarding the atom that became known as Dalton's postulates or Dalton's ato

Oduvanchick [21]

Answer:

The all 4 the given statements are part of Dalton's atomic theory.

Explanation:

Dalton's postulates or Dalton's atomic theory:

Matter is made up of small particles termed as atom.
Atoms are indivisible particle.
Atoms of different element have different masses and properties.
Atoms of the same element have the identical size, mass, and structure.
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3 years ago

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Gre4nikov [31]

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3 years ago

Magnesium is able to ____ copper, and copper is able to ____ magnesium.

Magnesium is able to copper, and copper is able to magnesium.