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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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Which one is the right spot because it really does not make any sense at all (in my viewpoint).

FinnZ [79.3K]

Answer: The last layer

Explanation: If nothing has affected the layers we can answer this accordingly to relative dating. The older rocks should be on the bottom while the younger rocks should be on the top.

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2 years ago

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3. How many grams of aluminum can be heated from 90°C to 120°C if 500 J of heat energy are applied?

IgorLugansk [536]

We are given:

Initial Temperature = 90°c

Final Temperature = 120°c

Heat applied(ΔH) = 500 Joules

Specific heat(c) = 0.9 Joules / g°C

Mass of Aluminium(m) = ?

Change in temperature:

ΔT = Final temp. - Inital Temp.

ΔT = 120 - 90

ΔT = 30°c

Calculating the mass:

We know the formula:

ΔH = mcΔT

replacing the values:

500 = m(0.9)(30)

500 = m(27)

m = 500/27

m = 18.52 grams

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3 years ago

The volume of gas occupied 240.0ml when the pressure is 1.20 atm what volume at constant pressure.will the gas occupies when the

Marizza181 [45]

Answer:

334.89 ml

Explanation:

V2 = V1P1/P2

V2 = 240×1.2/0.86

V2 = 334.89 ml

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3 years ago

When you get into a car with hot black leather in the middle of the summer and it hurts your skin when you sit, this is an examp

Gennadij [26K]

Heat can be transferred from one object to another in 3 different ways.

1) Conduction : This is the mode of transfer of heat through solid medium.

Example : A metal rod getting hot when hold over a flame.

2) Convection : This is the mode of transfer of heat through liquids

Example : Boiling of water.

3) Radiation : This type of heat transfer does not require any medium.

Example : When we stand close to a campfire, we feel warmer. Here the heat travels through air.

In the given problem, when a person gets into a car with hot black leather, his skin comes in contact with the hot object. Here the heat gets transferred through the skin which is a solid medium.

Therefore this is an example of conduction.

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4 years ago

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Recall that your hypothesis is that these values are the fraction of atoms that are still radioactive after n half-life cycles.

jolli1 [7]

Answer : A= 0.5, B = 0.25 , C = 0.125, D = 0.015625 and E = 0.00390625

Explanation :

Half life of a substance is defined as the amount of time taken by the substance to reduce to half of its original amount.

Here n represents the number of half lives.

The amount of substance that remains after n half lives can be calculated using the given formula, $0.5^{n}$

So when we have n =1,

Fraction of substance that remains = 0.5¹ = 0.5.

That means after first half life over, the amount of substance that remains is 0.5 times that of original.

Therefore we have A = 0.5

When n = 2, we have 0.5² = 0.25

So when 2 half lives are over, the amount of substance that remains is 0.25 times that of original

Therefore B = 0.25

When n = 3, we have 0.5³ = 0.125

So when 3 half lives are over, the amount of substance that remains is 0.125 times that of original.

Therefore we have C = 0.125

When n = 6 , we have 0.5⁶ = 0.015625

So D = 0.015625

When n = 8, we have 0.5⁸ = 0.00390625

Therefore E = 0.00390625

The values for A, B, C, D and E are 0.5, 0.25, 0.125, 0.015625 and 0.00390625 respectively.

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4 years ago

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