For a chemical reaction to be considered for use in a fuel cell, it is absolutely essential for the a. 32. free-energy change to be negative. reactants to be solids. reactants to be liquids. reactants to be gases. free-energy change to be positive.

Answers

Answer 1

For a chemical reaction to be considered for use in a fuel cell, it is absolutely essential for the free-energy change to be negative.

This is because a negative free-energy change indicates that the reaction is exothermic and releases energy, which is necessary to generate electricity in a fuel cell. The physical state of the reactants (whether they are solids, liquids, or gases) is not as important as the free-energy change.

For a chemical reaction to be considered for use in a fuel cell, it is absolutely essential for the free-energy change to be negative. A negative free-energy change indicates that the reaction is spontaneous and can release energy, which is required for fuel cells to generate electricity. The reactants in a fuel cell can be in different states, such as solids, liquids, or gases, but the key factor is the negative free-energy change.

To know more about free energy visit:

https://brainly.com/question/15319033

#SPJ11


Related Questions

Do number 5 vote you brainlest thanks

Answers

Answer:

DNA

Explanation:

because genetics come from DNA

How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction SiO2(g) + 3C(s) → SiC(s) + 2CO(g) ΔH° = 624.7 kJ/mol?

Answers

Answer:

31.24 kJ

Explanation:

SiO₂(g) + 3C(s) → SiC(s) + 2CO(g)        ΔH° = 624.7 kJ/mol

First we convert 3.00 grams of SiO₂ to moles, using its molar mass:

3.00 g SiO₂ ÷ 60.08 g/mol = 0.05 mol

Now we calculate the heat absorbed, using the given ΔH°:

If the complete reaction of 1 mol of SiO₂ absorbs 624.7 kJ, then with 0.05 mol:

0.05 mol * 624.7 kJ/mol = 31.24 kJ of heat would be absorbed.

The heat absorbed by 3.00 grams of SiO2 is 31.17 kJ/mol.

The thermochemical equation is;

SiO2(g) + 3C(s) → SiC(s) + 2CO(g) ΔH° = 624.7 kJ/mol

The number of moles of SiO2 = 3.00 g/60.08 g/mol = 0.0499 moles

From the reaction equation;

1 mole of SiO2 absorbs 624.7 kJ/mol

0.0499 moles SiO2 absorbs  0.0499 moles ×  624.7 kJ/mol/1 mole

= 31.17 kJ/mol

Learn more: https://brainly.com/question/2192784

Why might an increase in the concentration of greenhouse gases be a concern? What
might be the effect of an increase? Use the diagram to help you answer.

Answers

Answer:

too many greenhouse gases can cause the temperature to increase out of control. ... The increased greenhouse effect is causing changes in our planet that can affect our lives. The major Greenhouse Gas, carbon dioxide, emitted naturally and by the burning of fossil fuels, stays in the atmosphere a long

Effects: By increasing the concentration of greenhouse gases in the atmosphere, we’re amplifying the planet’s natural greenhouse effect and turning up the dial on global warming.

The atmosphere of the Earth may begin to trap more and more heat if these greenhouse gases are present in excess. Earth warms as a result of this.

What are Greenhouse gases?

A greenhouse gas is a gas that produces the greenhouse effect by both absorbing and emitting radiant energy at thermal wavelengths that are infrared. The five main greenhouse gases in the atmosphere of Earth are ozone, carbon dioxide, methane, and water vapour.

Carbon dioxide, methane, nitrous oxides, and water vapour are examples of greenhouse gases. (A "feedback" is the term used to describe water vapor, which reacts chemically or physically to changes in temperature.) Scientists have found that the warming effect of carbon dioxide contributes to the stabilisation of Earth's atmosphere.

Thus, the atmosphere of the Earth may begin to trap more and more heat if these greenhouse gases are present in excess. Earth warms as a result of this.

Learn more about Greenhouse gases here:

https://brainly.com/question/14131369

#SPJ2

Please help! I will give brainliest.

Answers

the answer is cannot be determined
because they don’t give a value for nh3 or h2o they only gave one for o2

Which group (family) of non-metals does not form ions?

Answers

Answer:

Noble gasses

Explanation:

nobled gasses

all elements want to loose or gain electrons to be like the noble gasses in bonding but the noble gasses do not bond.

What is the momentum of a car with a mass of 1,300 kg traveling north at a speed of 28 m/s?

Answers

Answer:

p = 36400 kg·m/s

Explanation:

p=mv

p= Momentum

m= mass (1300 kg)

v= 28

1300 × 28

= 36400 kg·m/s

The Momentum of the car is 36400 kg-m/s.

What is Momentum ?

Momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.  m is an object's mass and v is its velocity

Given that,

Mass of the car, m = 1300 kgSpeed of the car, v = 28 m/s (towards north)

(m is an object's mass and v is its velocity)

To find :

The momentum of car, p

Solve :

Let p is the momentum of an object. It can be calculated by the product of mass and its velocity. The formula to find it is given by :

p = m x v

  = 1300 x 28

  = 36400 kg-m/s.

Therefore, the momentum of the car is 36400 kg-m/s.

Learn more about Momentum here :

https://brainly.com/question/24030570

#SPJ6

Question 4 of 20
A student is performing experiments on a particular substance. Which
statement is an observation of a chemical property of the substance?
A. Its viscosity decreases.
B. It boils.
C. Electricity passes through it.
D. It reacts with acid.
SUBMIT

Answers

Answer:

D

Explanation:

Reacting with acid is the only chemical property out of the 4 options. The rest are physical

At sea level, a kilogram welghs approximately
2 pounds
10 pounds
5 pounds
1 pound

Answers

Answer:

1 kilogram weight at sea level would be the equivalent of  2 pounds.

Explanation:

In the formula XS04, the symbol X could represent the element*
O (1) AI
O (2) Ar
O (3) Mg
0 (4) Na

Answers

4) Mg, sulfato de magnesio

Which statement is best illustrated in the diagram above regarding how the Sun's energy affects the Earth's surface from June through September in the Northern Hemisphere? The season changes from autumn to winter, daylight hours decrease, and infrared radiation is the weakest during the June solstice. B The season changes from winter to spring, daylight hours increase, and infrared radiation is the weakest during the September equinox. C The season changes from summer to autumn, daylight hours decrease, and infrared radiation is the strongest during the June solstice. The season changes from spring to summer, daylight hours increase, and infrared radiation is the strongest during the September equinox.​

Answers

Answer:

I'm sorry but there is no diagram above.

how many moles of water are required to produce 2.15 mol oxygen gas in this reaction

Answers

How am I supposed to know >:(

4 points
What is the volume of an object with a density of 5.20 g/cm3 and a mass
of 6.00 x 10^2? g?

Answers

divide mass by density to determine volume. 115.384 cm^3 (unsure if you need to round.)

Select the correct answer.
When a substance changes from one phase to another, which of the following occurs?
OA. The substance loses or gains heat.
shoes
OB. The average kinetic energy of the substance changes.
OC. The temperature of the substance changes.
OD. The molecular motion of the substance changes.
Reset
Next

Answers

D. The molecular motion of the substance changes.

how many atoms are in 1.2x10^5 moles of neon?​

Answers

Answer:

7.224 × 10^28 atoms

Explanation:

The number of moles contained in a substance (n) can be calculated from this expression:

nA = n × 6.02 × 10^23 atoms

Where;

nA = number of atoms of substance

n = number of moles of substance

Avagadro's number or constant = 6.02 × 10^23 atoms

Using nA = n × 6.02 × 10^23 atoms

In this question, there are 1.2 x 10^5 moles of neon (N). The number of atoms (nA) is as follows:

nA of neon = 1.2 x 10^5 × 6.02 × 10^23

nA = 7.224 × 10^ (5 + 23)

nA = 7.224 × 10^28 atoms

The number of neon atoms in 1.2 x 10^5 is 7.224 × 10^28 atoms.

If the available number of valence electrons for a molecule or polyatomic ion does not complete all of the octets in a lewis structure what should you do

Answers

Answer:

If the available number of valence electrons for a molecule or ion does not complete all of the octets, then multiple bonds must be drawn.

Explanation:

If the available number of valence electrons for a molecule or ion does not complete all of the octets, then multiple bonds must be drawn.

We must note that Lewis structures are representations of molecules Using dots to show the number of valence electrons on the valence shell of the atoms of  each of the constituent elements in the molecule. Each atom is expected to have an octet of electrons on its outermost shell.

Many times, we encounter Lewis structures in which the octet of some atoms are incomplete. This means that the atoms have less than eight outermost electrons.

In such cases, we must invoke the idea of multiple bonds to account for the incomplete octet.

Learn more: https://brainly.com/question/4144781

Why doesn't the Earth usually feel solar winds?
A. because of the aurora borealis
B. because of its strong magnetic field
C. because of strong magnetic activity inside the Sun
D. because they contain electromagnetic radiation

Answers

Answer is B

the magnetosphere deflects most of the charged particles and shields our planet's surface

iron (ii) hydroxide + sodium nitrate. Name the precipitate formed in reaction

Answers

Green colored precipitate of iron (||) hydroxide

why and how do ions form?

Answers

Answer and Explanation:

Ions are electrically charged particles that are formed from the removing and addition of electrons. It can be a positively or negatively charged atom.

Does anybody know how to find the theoretical yield? you can just do 1 equation

Answers

Answer:

its the first part in mass of sodium

Explanation:

:)

Determina la densidad de una barra dd hierro cuya masa ed de 160gr y su volumen es de 20,35cm³ ¿que volumen ocuparan 12g de hierro?

Answers

Answer:

15.26 cm³

Explanation:

La densidad de una sustancia se define como su masa por unidad de volumen:

densidad = masa/volumen

Tenemos los siguientes datos de la barra de hierro:

masa = 160 g

volumen = 20,35 cm³

Por lo tanto, la densidad de la barra de hierro es:

densidad = 160 g/20,35 cm³ = 0.786 g/cm³

El volumen de 12 gramos de hierro se calcula utilizando el dato de masa (12 g) y la densidad calculada:

densidad = masa/volumen  ⇒ volumen = masa/densidad

                                                                 = 12 g/(0.786 g/cm³)

                                                                 = 15.26 cm³

Do you think personality
traits are primarily inherited
from your parents or
influenced by the
environment? What is your
evidence you researched?

Answers

influenced by the environment

Personality traits are influenced by a combination of genetic and environmental factors. Research suggests that both genetics and the environment play significant roles in shaping an individual's personality.

Studies on twins and adoption give proof that genetics affect personality. When opposed to fraternal twins, who only share 50% of their genetic makeup, identical twins, who share 100% of their genetic material, frequently show stronger similarities in personality traits. This shows that certain personality traits are influenced by hereditary factors.

Yet, environmental influences also have a considerable impact on personality. Despite having comparable DNA, studies on non-twin siblings reared in the same home have found that they frequently display personality differences.

This shows that the environment, including parental practices, cultural influences, and life events, has a significant impact on personality development.

To know more about Personality traits:

https://brainly.com/question/28139450?referrer=searchResult

#SPJ2

can someone please explain this i will give brainliest

Answers

1) 2
2) 2
3) there are 2 atoms of hydrogen and 1 atom of oxygen, altogether is 3
4) subscript tells how many atoms of each element are present in the molecule
5) No, it is not balanced because the oxygen atom is not equal on both sides of the reactants and products. This wouldn’t be considered balanced as there are two oxygen atoms in the reactants section and only one oxygen on the products section.

It is:
2 H2 + O2 -> 2 H2O

H2 + Cl2 --> 2HCl

If 500 molecules of H2 react with 400 molecules of Cl2, how many of HCl will be produced?

Answers

Answer:

c20 will be there ok

Explanation:

okbbbbbbbbbbyyyyyyyy


All elements in this series are radioactive

Answers

Answer:

you did not posted the series

Explanation:

the empirical formula is C6H6O.vapour density is 47.find the molecular formula​

Answers

Answer: The molecular formula will be [tex]C_6H_6O[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

The empirical formula is [tex]C_6H_6O[/tex]

The empirical weight of [tex]C_6H_6O[/tex] = 6(12)+6(1)+1(16) = 94 g.

The molecular weight = [tex]2\times \text{vapour density}=2\times 47=94[/tex]

Now we have to calculate the molecular formula.

[tex]n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{94}{94}=1[/tex]

The molecular formula will be=[tex]1\times C_6H_6O=C_6H_6O[/tex]

If 276 g of dinitrogen tetroxide and 64.0 g of hydrazine are mixed, how many grams of nitrogen gas can you produce?

Answers

Answer:

84 g of N₂        

Explanation:

We begin from the reaction:

N₂O₄  +  2N₂H₄ →  3N₂  + 4H₂O

  1st step: Find out the limiting reactant.

We convert the mass to moles.

       276 g . 1mol/ 92g = 3 moles of N₂O₄

64 g . 1mol / 32g = 2 moles of hidrazine  

Limiting reactant is the hydrazine. Ratio is 1:2, then for 3 moles of tetroixde I may need 6 moles of N₂H₄. (But I only have 2).

To determine the grams of produced nitrogen we see stoichiometry (2:3)    

2 moles of hydrazine can produce 3 moles of N₂

Definetaly our 2 moles make 3 moles of gas.

We convert the moles to mass.

3 mol . 28g /1mol = 84 g of N₂                                                                                                

                                   

Explain why the metals conduct electricity



write in your own words please, don't copy-paste from internet

Answers

Answer:

Metals conduct electricity because the electrons inside the metal are relatively free to move. So when electricity is pass through metals, electrons carry electricity and spread it all over the metal. The mobility of electrons is the reason why metals conduct electricity.

Thea is doing a chemistry experiment. The instructions say she needs to use pure water. Hamza offer her a bottle labelled “100% Pure Spring Water”. Suggest why this water is unlikely to be suitable for the experiment [2]

A scientist is comparing 2 samples of the same compound. One is pure and the other is impure. The compound is a solid at room temperature. Explain how the scientist could tell which is the pure compound. [2]

The melting point of pure asprin is 136oC. The melting point of a sample of asprin is measured as being between 128 – 132oC. Give two reasons that suggest the sample is not pure asprin. [2]
Gunpowder is a formulation of potassium nitrate, charcoal and sulphur in the ratio 15 : 3 : 2
What is meant by the term “formulation” [2]
Calculate the mass of charcoal in 40g of gunpowder [1]
if you can just give me hints that would be great

Answers

How is this going to help us in life wat the fawk

7. C2H4O2 is what? vinegar

Answers

Answer:

Yes its vinegar

Explanation:

Actually [tex] \bold{\red {C_2H_4O_2}} [/tex] is the formula for acetic acid which is found in vinegar.


How does the nervous system work with the digestive system?

A: The muscular and nervous systems enable the involuntary breathing mechanism.
B: It doesn't
C: The enteric nervous system's network of nerves, neurons and neurotransmitters extends along the entire digestive tract - from
the esophagus, through the stomach and intestines, and down to the anus.
D: Gets nutrients (good) from food and hands it over to the blood

Anyone help I’m failing :(

Answers

Answer:

Enteric Nervous System

The enteric nervous system (ENS) is a subdivision of the autonomic nervous system (ANS) that directly controls the gastrointestinal system.

LEARNING OBJECTIVES

Describe the structure and function of the enteric nervous system (ENS)

KEY TAKEAWAYS

Key Points

The enteric nervous system (ENS), which is embedded in the lining of the gastrointestinal system, can operate independently of the brain and the spinal cord.

The ENS consists of two plexuses, the submucosal and the myenteric. The myenteric plexus increases the tone of the gut and the velocity and intensity of contractions. The submucosal plexus is involved with local conditions and controls local secretion, absorption, and muscle movements.

While described as a second brain, the enteric nervous system normally communicates with the central nervous system (CNS) through the parasympathetic (via the vagus nerve ) and sympathetic (via the prevertebral ganglia) nervous systems, but can still function when the vagus nerve is severed.

The ENS includes efferent neurons, afferent neurons, and interneurons, all of which make the ENS capable of carrying reflexes and acting as an integrating center in the absence of CNS input.

The ENS contains support cells, which are similar to the astroglia of the brain, and a diffusion barrier around the capillaries surrounding the ganglia, which is similar to the blood –brain barrier of cerebral blood vessels.

Key Terms

enteric nervous system: A subdivision of the peripheral nervous system that directly controls the gastrointestinal system.

EXAMPLES

The second brain of the enteric nervous system is the reason we get butterflies in our stomach or need to use the restroom more frequently when we are nervous and/or under stress.

The gastrointestinal (GI) system has its own nervous system, the enteric nervous system (ENS). Neurogastroenterology is the study of the enteric nervous system, a subdivision of the autonomic nervous system (ANS) that directly controls the gastrointestinal system. The ENS is capable of autonomous functions such as the coordination of reflexes.

Although it receives considerable innervation from the autonomic nervous system, it can and does operate independently of the brain and the spinal cord. The ENS consists of some 100 million neurons, one-thousandth of the number of neurons in the brain, and about one-tenth the number of neurons in the spinal cord. The enteric nervous system is embedded in the lining of the gastrointestinal system.

Ganglia of the ENS

The neurons of the ENS are collected into two types of ganglia:

The myenteric (Auerbach’s) plexus, located between the inner and outer layers of the muscularis externa

The submucosal (Meissner’s) plexus, located in the submucosa

The Myenteric Plexus

The myenteric plexus is mainly organized as a longitudinal chains of neurons. When stimulated, this plexus increases the tone of the gut as well as the velocity and intensity of its contractions. This plexus is concerned with motility throughout the whole gut. Inhibition of the myenteric system helps to relax the sphincters —the muscular rings that control the flow of digested food or food waste.

The Submucosal Plexus

The submucosal plexus is more involved with local conditions and controls local secretion and absorption, as well as local muscle movements. The mucosa and epithelial tissue associated with the submucosal plexus have sensory nerve endings that feed signals to both layers of the enteric plexus. These tissues also send information back to the sympathetic pre-vertebral ganglia, the spinal cord, and the brain stem.

This is an illustration of neural control of the gut wall by the autonomic nervous system and the enteric nervous system. A sensory neuron is shown to stimulate the nerves in the submucosal and myenteric plexuses, which are connected to nerves in the sympathetic and parasympathetic nervous systems. The sensory neuron is also shown signal the ganglia and central nervous system.

Neural control of the gut: An illustration of neural control of the gut wall by the autonomic nervous system and the enteric nervous system.

Function and Structure of the ENS

The enteric nervous system has been described as a second brain. There are several reasons for this. For instance, the enteric nervous system can operate autonomously. It normally communicates with the central nervous system (CNS) through the parasympathetic (e.g., via the vagus nerve) and sympathetic (e.g., via the prevertebral ganglia) nervous systems. However, vertebrate studies show that when the vagus nerve is severed, the enteric nervous system continues to function.

Explanation:

the answer is A:The muscular and nervous systems enable the involuntary breathing mechanism
Other Questions
best answer gets brainliest I have no idea what to put, pls help, due tmr(science) Solve the inequality:-15 + 5x > 25 I NEED HELP WITH ALL 3 PLEASE HELP !!! ILL GIVE THE BRAINIEST!!!! "Sino" is another word forTaiwaneseJapaneseKoreanChinese 3629 you can use the digits twice make the largest four digit number A cell containing 20 chromosomes undergoes mitosis, each daughter cell will have 20 chromosomesa.Trueb.False Which amendment would deal with the government paying money to a land owner for their land? Which statement best compares coal and ores?Both are burned for energy. Both take millions of years to form. Both require oxygen to form. Both are used to make coins. How does nutrition play a part in your overall fitness program? How to do this problem? Thank you! Don deposited $3,500 for 5 years on 2.40% P. A. interest rate in his savings account. How much simple interest will he earn? A. X = -6 and X = -5.5B. x = -0.5 and x = -5C. X = 0 and x = 5D. X = 5 and x = 6 how did a union soldier feel about Lincoln's inaugural speech after hearing it? Mrs. Beppu's property has four sides. An aerial view of her property is shown below. What term best describes the shape of her property? Read the passage.Which line is the BEST example of the author creating tension?Select one:Then he remembered what followed that evening. It was decided that the young man should spend the years of his captivity under the strictest supervision in one of the lodges in the bankers garden. It was agreed that for fifteen years he should not be free to cross the threshold of the lodge, to see human beings, to hear the human voice, or to receive letters and newspapers.What was the object of that bet? What is the good of that mans losing fifteen years of his life and my throwing away two million? Can it prove that the death penalty is better or worse than imprisonment for life? No, no. It was all nonsensical and meaningless. On my part it was the caprice of a pampered man, and on his part simple greed for moneyHe was allowed to have a musical instrument and books, and was allowed to write letters, to drink wine, and to smoke. By the terms of the agreement, the only relations he could have with the outer world were by a little window made purposely for that object.The agreement provided for every detail and every trifle that would make his imprisonment strictly solitary, and bound the young man to stay there exactly fifteen years, beginning from twelve oclock of November 14, 1870, and ending at twelve oclock of November 14, 1885.PLS HELP Your teacher gives you a task in science class. You must decide which of the five samples you are given are alive or were once alive. One specimen is a crust gray-green object. What is the BEST clue you could use to decide: living thing or not a living thing.A) Does it move? B) Does it have DNA?C) Is it made of cells?D) Can it make its own food? Rivera Company has several processing departments. Costs charged to the Assembly Department for November 2020 totaled $2,283,744 as follows. Work in process, November 1 Materials $78,600 Conversion costs 48,700 $127,300 Materials added 1,592,280 Labor 225,100 Overhead 339,064 Production records show that 35,200 units were in beginning work in process 30% complete as to conversion costs, 661,000 units were started into production, and 25,400 units were in ending work in process 40% complete as to conversion costs. Materials are entered at the beginning of each process.Determine the equivalent units of production and the unit production costs for the Assembly Department. (Round unit costs to 2 decimal places, e.g. 2.25.) In the early 1900s, what was developed and used that opened the door for naval use of aircraft? this is too tough for me plz help me out.