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Irina-Kira [14]
3 years ago
5

When a clean iron nail is placed in an aqueous solution of copper(ii) sulfate, the nail becomes coated with a brownish black mat

erial. (a) what is the name of the material coating the iron? (b) what are the oxidizing and reducing agents? (omit states-of-matter in your answer.) oxidizing agent: chempadhelp?
Chemistry
1 answer:
Tresset [83]3 years ago
5 0
<span>(a) What is the material coating the iron? Cu(s) 

(b) What is the oxidizing agent? The oxidizing agent is reduced (goes down in oxidation number) since Cu starts off as Cu^2+ and ends up as Cu^0, it went down in oxidation number, was reduced, and thus was the oxidizing agent. 

</span>
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Calculate the enthalpy of the reaction
harkovskaia [24]

Answer : The enthalpy of the reaction is, -2552 kJ/mole

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given enthalpy of reaction is,

4B(s)+3O_2(g)\rightarrow 2B_2O_3(s)    \Delta H=?

The intermediate balanced chemical reactions are:

(1) B_2O_3(s)+3H_2O(g)\rightarrow 3O_2(g)+B_2H_6(g)     \Delta H_A=+2035kJ

(2) 2B(s)+3H_2(g)\rightarrow B_2H_6(g)    \Delta H_B=+36kJ

(3) H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l)    \Delta H_C=-285kJ

(4) H_2O(l)\rightarrow H_2O(g)    \Delta H_D=+44kJ

Now we have to revere the reactions 1 and multiple by 2, revere the reactions 3, 4 and multiple by 2 and multiply the reaction 2 by 2 and then adding all the equations, we get :

(when we are reversing the reaction then the sign of the enthalpy change will be change.)

The expression for enthalpy of the reaction will be,

\Delta H=-2\times \Delta H_A+2\times \Delta H_B-6\times \Delta H_C-6\times \Delta H_D

\Delta H=-2(+2035kJ)+2(+36kJ)-6(-285kJ)-6(+44)

\Delta H=-2552kJ

Therefore, the enthalpy of the reaction is, -2552 kJ/mole

4 0
3 years ago
Type the correct answer in each box. Spell all words correctly.
Dmitry_Shevchenko [17]
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3 years ago
In a chemical reaction, water decomposes to form hydrogen and oxygen. What is the correct term for the water?
gulaghasi [49]
The answer is: [D]: a reactant.
________________________
7 0
3 years ago
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In the graphic, 195 represents the _______.
Marrrta [24]

Answer:

ITS ANSWER IS

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5 0
2 years ago
Use dimensional analysis to convert 4.68 g of Boron to cubic centimeters of Boron. The density of Boron is 2.34 g/cm^3
harina [27]

Answer:

The cubic centimeter of boron is 2.

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

mass of boron = 4.68 g

density  of boron = 2.34 g/cm³

volume = ? (cm³)

Solution:

d = m/ v

v = m/d

v = 4.68 g/ 2.34 g /cm³

v = 2 cm³

8 0
3 years ago
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