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3 years ago

Which process occurs at the anode in an electrochemical cell?

1 answer:

5 0

The process that occurs at the anode in an electrochemical cell is the loss of electrons. The answer is number 2. Oxidation occurs as electrons are lost at the anode at one of the electrodes in both an electrolytic cell and a voltaic cell.

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Calculate ΔHrxn for the following reaction: Fe₂O₃(s)+3CO(g)→2Fe(s)+3CO₂(g) Use the following reactions and given ΔH′s. 2Fe(s)+3/

ExtremeBDS [4]

Answer : The enthalpy change of reaction is -23.9 kJ

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 final reaction is,

$Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)$ $\Delta H=?$

The intermediate balanced chemical reaction will be,

(1) $2Fe(s)+\frac{3}{2}O_2(g)\rightarrow Fe_2O_3(s)$ $\Delta H^o_1=-824.2kJ$

(2) $CO(g)+\frac{1}{2}O_2(g)\rightarrow CO_2(g)$ $\Delta H^o_2=-282.7kJ$

First we will reverse the reaction 1 and multiply equation 2 by 3 then adding both the equation, we get :

(1) $Fe_2O_3(s)\rightarrow 2Fe(s)+\frac{3}{2}O_2(g)$ $\Delta H^o_1=+824.2kJ$

(2) $3CO(g)+\frac{3}{2}O_2(g)\rightarrow 3CO_2(g)$ $\Delta H^o_2=3\times (-282.7kJ)=-848.1kJ$

The expression for final enthalpy is,

$\Delta H=\Delta H^o_1+\Delta H^o_2$

$\Delta H=(+824.2kJ)+(-848.1kJ)$

$\Delta H=-23.9kJ$

Therefore, the enthalpy change of reaction is -23.9 kJ

7 0

3 years ago

Even about the food chain is correct?

kap26 [50]

Answer:

its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true

Explanation:

its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true

8 0

3 years ago

How much does the Earth weigh?

ELEN [110]

5.972 × 10^24 kg

hope it helps

6 0

3 years ago

Read 2 more answers

Jill then wrote the formulas for all the possible compounds that sodium can form with the other ions. What formulas did she writ

sp2606 [1]

Explanation:

Sodium has atomic number of 11 and its electronic configuration is given by:

$[Na]=1s^22s^22p^63s^1$

The nearest stable electronic configuration to sodium is of the neon. So, in order to attain stability of noble gas it will loose its single electron.

$Na\rightarrow Na^++1e^-$

$[Na^+]=1s^22s^22p^63s^0$

Sodium has single valency that is 1.

Let nbe the valency of the ion 'X'

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

$Na_nX_1$

So, the formulas for all the possible compounds that sodium can form with the other ions will be:

$Na_nX_1$

4 0

4 years ago

Which of the following provides the best description of the function of genes?

Schach [20]

Answer:

D. Controlling the production of specific proteins.

Explanation:

Genetic material is the main thing that inherited from parents to their offsprings. Gene encodes proteins that will be expressed(produced) when it needed. The protein can be used to build the cell organ, enzyme enzyme that digest food, hormones, and many other things. By inheriting the gene, the offspring will have a similar traits to the parent. The trait can differ a lot for sexual reproduction since only half of each parent gene inherited to the offspring.

5 0

4 years ago