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4 years ago

26 Which process occurs in an operating voltaic cell?(1) Electrical energy is converted to chemical energy.

Chemistry

2 answers:

tia_tia [17]4 years ago

8 0

Answer is: (2) Chemical energy is converted to electrical energy.

An electrochemical cell (voltaic or galvanic cell) is generating electrical energy from chemical reactions.

In galvanic cell, specie (for example zinc and zinc cations) from one half-cell, lose electrons (oxidation) and species from the other half-cell (for example copper and copper cations) gain electrons (reduction).

Oxidation on the zinc anode: Zn(s) → Zn²⁺(aq) + 2e⁻.

Reduction on the copper cathode: Cu²⁺(aq) + 2e⁻ → Cu(s).

Alchen [17]4 years ago

7 0

The answer is (2) chemical energy is converted to electrical energy. The choice of (1) describes the electrolytic cell. The oxidation takes place at the anode and reduction takes place at the cathode.

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In a particular reaction, 53.8 g of liquid silicon tetrachloride is added to 65.0 g of solid magnesium to produce solid magnesiu

kotykmax [81]

Answer: Mg is the excess reactant for the forward reaction.

Explanation: It is a stoichiometry problem and solved with the help of given grams and using balanced equation. Grams of both the reactants are converted to moles and divided by their coefficients. The excess reactant is the one for which we get the highest number on doing above steps.

The balanced equation is:

$SiCl_4(l)+2Mg(s)\rightarrow 2MgCl_2(s)+Si(s)$

Molar mass of silicon tetra chloride is 169.9 gram per mol and the molar mass of Mg is 24.3 gram per mol.

$53.8gSiCl_4(\frac{1mol}{169.9g})$

= $0.317molSiCl_4$

$65.0gMg(\frac{1mol}{24.3g})$

= 2.67 mol Mg

From balanced equation, the coefficient of silicon tetra chloride is 1 and that of Mg is 2. So, we will divide the moles of silicon tetra chloride by 1 and that of Mg by 2 and see which one gives highest number.

For silicon tetra chloride, $\frac{0.317}{1}$ = 0.317

and for Mg, $\frac{2.67}{2}$ = 1.34

The highest number is for Mg and so the excess reactant for the forward reaction is Mg.

7 0

3 years ago

What is the fuel used in a fuel-cell automobile

Katena32 [7]

Hydrogen gas

Explanation

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3 years ago

Explain why water has a higher boiling point than carbon iv oxide and the two are simple molecular structures

Nezavi [6.7K]

Because H2O molecules make Hydrogen bounding and that's the first and strongest bound between molecules of a structure... So they stick together and don't let each other get evaporated...

U need lotsa energy to turn them into Gas shape

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3 years ago

Because water molecules are polar and carbon dioxide molecules are nonpolar,

Gala2k [10]

The correct is D.

Water is a polar molecule and it has polar bonds, which carry partially positive and partially negative charges. This polar bond increases the attraction between molecules of water and thus it requires a greater energy to break the bond between the molecules of water compare to carbon dioxide, which is a non polar molecule. Thus, water has a higher boiling point than carbon dioxide.

4 0

3 years ago

Read 2 more answers

Explain, in terms of electrons, why the bonding in strontium sulfide, SrS, is similar to the bonding in magnesium bromide, MgBr2

Aleksandr-060686 [28]

Answer: both compounds have ionic bond between metal and non-metal

Explanation: both Sr and Mg are earth alkaline metals and form ions Mg^2+

And Sr^2+. Br forms ion Br^- and S ion is S^2+.

5 0

3 years ago