All categories

3 years ago

PLEASE HELP!!!

Chemistry

1 answer:

Ksju [112]3 years ago

6 0

Answer : The correct option is, (B) Oxygen diffuses through the anode.

Explanation :

Hydrogen-oxygen fuel cell : As we know that the a fuel cell is a type of device that converts the chemical energy into electrical energy. In the hydrogen-oxygen fuel cell, the proton exchange membrane cell uses hydrogen and oxygen gas as a fuel.

In this cell reaction, hydrogen and oxygen gas are the reactants and water, electricity and heat are the products.

The half-cell electrode reaction are:

At anode : $2H_2(g)+4OH^-(aq)\rightarrow 4H_2O(l)+4e^-$

At cathode : $O_2(g)+2H_2O(l)+4e^-\rightarrow 4OH^-(aq)$

That means the hydrogen undergoes reduction at anode and oxygen undergoes oxidation at cathode.

As per question, we can say that oxygen diffuses towards anode and hydrogen diffuses towards cathode.

Hence, the correct option is, (B) Oxygen diffuses through the anode.

You might be interested in

Water readily sticks to many other substances, a property called ______. Water readily sticks to many other substances, a proper

Ahat [919]

Answer:

Option (2)

Explanation:

Cohesion is usually defined as the contrasting property by which the water molecules are attached to one another, and adhesion is the property by which the molecular substances are linked to the molecules of other substances.

Since, the water molecules are able to form inter-molecular hydrogen bonding, so they are comprised of strong cohesive force.

And, as the water molecules are able to stick to the walls of the container, so they tend to show more of the properties for adhesion.

Thus, according to the given condition, water molecules are sticking to other substances and this is the property of adhesion.

Hence, the correct answer is option (2).

4 0

3 years ago

How many moles is 22.4 liters of oxygen gas at standard temperature and pressure represent

makkiz [27]

Answer:

So 1 mole

Explanation:

PV = nRT

P = Pressure atm

V = Volume L

n = Moles

R = 0.08206 L·atm·mol−1·K−1.

T = Temperature K

standard temperature = 273K

standard pressure = 1 atm

22.4 liters of oxygen

Ok so we have

V = 22.4

P = 1 atm

PV = nRT

n = PV/RT

n = 22.4/(0.08206 x 273)

n = 22.4/22.40

n = 1 mole

7 0

3 years ago

Determine the number of significant figures in the measurement quantity: 2600. kg.

xxMikexx [17]

Answer:

2600 kg has 4 significant figures

Explanation:

Any different number to zero is a significant figure

For example, 1.8 → 2 significant figures

When you have 0 in the middle of two numbers, we consider it as a significant number

For example, 3.02 → 3 significant figures

When you have 0 on the left in the measure, we do not consider as a sgnificant figures

For example 0.0010 → 2 significant figures (10)

3.0 → 2 significant figures (0 is on the right, not the left)

7 0

2 years ago

The SI unit of measure for length - the meter -would be most appropriate when

erastovalidia [21]

Answer:- The correct answer is B. measuring the height of a building.

Explanations:- Insects and ants are very small. So, meter is not the right unit of measure their length. Their lengths would be measure in mm that is millimeters. So, options A and C are not good.

The distance between two cities is mostly too much so it's measured in kilometers or miles. So, D is also not good.

Height of buildings is measured in meters and so the correct option is B.

7 0

3 years ago

Four conditions which cause a metathesis reaction to occur?

zubka84 [21]

Metathesis is a type of reaction in which the cations and anions exchange partners. this reaction is also called double replacement. Metathesis reactions are driven by the formation of a product .this reaction is classified into three different categories: formation of precipitate, f<span>ormation of a Weak or Non-electrolyte and production of the gas.</span>

4 0

3 years ago