It is always feasible that a substance will dissolve in water when:

A. Enthalpy is negative and entropy is positive.
B. Enthalpy is negative and entropy is negative.
C. Enthalpy is positive and entropy is positive.
HELP PLEASE 15 points

Answers

Answer 1

The free energy is always negative and the dissolution is feasible when enthalpy is negative and entropy is positive. Option A

What is dissolution of a substance in water?

Water is known as the universal solvent. Water is a polar substance hence it is often used to dissolve polar substances. It has a dipole and being that there is a high degree of electronegativity difference between the oxygen and the hydrogen atoms in water, it is feasible that the degree of hydrogen bonding between the two is high.

We know that dissolution is favored when there will be an increase in entropy as a result of that, that is; if more particles will appear. Now we know that ΔG = ΔH - TΔS.

Given the equation above, it then follows that the free energy is always negative and the dissolution is feasible when enthalpy is negative and entropy is positive. Option A

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Related Questions


A gas at 127 celsius and 10.0 L expands to 20.0 L. What is the new
temperature in kelvin? (You must convert to Kelvin before calculating
this problem

Answers

Answer:

800.3 Kelvin

Explanation:

127°C = 400.15 Kelvin   (because 127 + 273.15)

Charles Law:

[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]   Thus, [tex]\frac{10.0 L}{400.15 K} = \frac{20.0 L}{T2}[/tex]

Then, work out the math algebraically.  

T2 = 20.0 / (10.0/400.15)

= 20.0 / 0.02499...

= 800.3 Kelvin

This is assuming the pressure remains constant.

what is light energy​

Answers

Answer:

Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up.

Explanation:

Answer:

Light energy is a kind of kinetic energy with the ability to make types of light visible to human eyes. Light is defined as a form of electromagnetic radiation emitted by hot objects like lasers, bulbs, and the sun. Light contains photons which are minute packets of energy.

Explanation:

hope it's helpful for you.

can someone help w/ chem plzz

Answers

Answer:

my answer I think is tetrahedral

Step 9: Measure Pressure and Volume with the Book and 4 kg of Weight Total the mass on the syringe. Record it in the correct row of the data table. kg ​

Answers

Answer:

498 g

0.498 kg

Explanation:

Answer:

4.498 kg

1.47

35.0

51.5

Explanation:

What is the average atomic mass of the isotopes shown in the table?
Isotope Abundance (%) Mass of Isotope (amu)
Isotope-A
54.0
17.984
Isotope-B
32.0
18.985
Isotope-C
14.0
19.982

Answers

Answer:

18.58

Explanation:

From the question given above, the following data were:

Isotope A:

Abundance of A = 54%

Mass of A = 17.984 amu

Isotope B:

Abundance of B = 32%

Mass of B = 18.985 amu

Isotope C:

Abundance of C = 14%

Mass of C = 19.982 amu

Average atomic mass =?

AVERAGE = [(Mass of A × A%)/100)] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

AVERAGE = [(17.984 × 54%)/100] + [(18.985 × 32%)/100] + [(19.982 × 14%)/100]

= 9.71136 + 6.0752 + 2.79748

= 18.58

Therefore, the average atomic mass of the isotope is 18.58 amu

The pH of a solution is 8. Some hydrochloric acid is added to the solution. Suggest the pH of the solution after mixing. pH=.......??

Answers

Answer:

By adding acid to hydrogencarbonate you create a large concentration of CO2 in solution causing the solution to be highly supersaturated. This keeps the pH down as CO2 is in equilibrium with carbonic acid. During the day long mixing the excess CO2 strips off and as acid leaves the solution the pH increases.

Explanation:

Hope it helps

A solution with a pH of 8 will have its pH reduced with the addition of hydrochloric acid.

What is pH?

It is the degree of acidity or alkalinity of solutions.

pH ranges from 0 to 14 with 7 being a neutral pH. Any pH below 7 is acidic while above 7 is basic.

Thus, a pH of 8 is basic and the addition of hydrochloric acid will reduce it towards 7 or even below it.

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Explain why the metals conduct electricity.


Write in your own words.
Please don't copy-paste from the internet.

Answers

Answer:

Metals conduct electricity because they have free Electrons in them which helps the current to move eaisily

the number of molecules present in 0.036g of water​

Answers

Answer:

5

Explanation:

What element has the following Electron Configuration?

Answers

1s2 2s2 2p6 3s2 3p6
Here you go

Please help fast. I will give brainliest.

Answers

Answer:39 min

Explanation:

Look carefully at the list of objects and order
them from smallest to largest.
ant
atom
cell
dust particle
ping pong ball
Explain why you have them in this order. Be sure
to use a 5 complete thoughts.
:

Answers

Answer:

Atom, cell, dust particle, ant, ping pong ball

Explanation:

Firstly, atoms make up all matter, including each of the items on that list. The only things smaller than atoms are the parts of the atom itself, protons, neutrons and electrons. Because none of those are on that list, atoms have to be the smallest. Next smallest is the cell. Cells are made up of atoms, but they also in part make up dust. You can see a dust particle with the naked eye, but in order to see a cell you must use a microscope. Thus, cells are smaller than dust particles. Next is an ant. Obviously, an ant is bigger than a speck of dust, and is made up of cells and atoms. Lastly all you have is the ping pong ball, which is much larger than the rest of the items. Hope this helps!

All matter, including each thing on the list, is made up of atoms. The protons, neutrons, and electrons that make up an atom are the only particles smaller than atoms.

Thus,  Atoms must be the tiniest object because none of those are included in that list. The cell is the next smallest. Atoms make up cells, but dust also makes up a portion of them.

A dust particle can be seen with the unaided eye, but a microscope is required to see a cell.

Cells are hence smaller than dust particles. An ant comes next. Of course, an ant is composed of cells and atoms and is larger than a particle of dust.

Thus, All matter, including each thing on the list, is made up of atoms. The protons, neutrons, and electrons that make up an atom are the only particles smaller than atoms.

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Which have a mass of 0 amu ?

I give Brainliest!!!!

Answers

Answer:

Electrons

Explanation:

Protons and Neutrons have an amu of 1

Answer:

c. Electrons

Explanation:

Electrons are found outside the nucleus and are the lightest.

Pascal’s Law states that when pressure is applied from an outside source to a contained fluid, the force is
a. transferred through the liquid in a single direction
b. transferred through the liquid in the opposite direction
c. transferred unequally through the liquid in all directions
d. transferred equally through the liquid in all directions

Answers

Answer:

a

Explanation:

Answer:

a.....................

PLSSSSSS HELPPPPPPP FAST WILL GIVE BRAINLIEST I NEED A 3 PARAGRPAH ESSAY ON THIS SCIENCE ARTICLE!! INTRODUCION BODY AND CONCLUSION EACH PARAGRAPH 5 SENTENCES OR MORE!!!!!!

Answers

Answer:

jst do the work

Explanation:

its not complicated,ask your teacher for help

Is hydrogen bond an attraction between polar molecules

Answers

Answer:

No because if there was an attraction hydrogen would not do it's function

In a lab, a scientist mixes a purple powder-like substance and a clear liquid together. The scientist observes that the two substances begin combining together, and he notices a gas begin to bubble out of the mixture. Did the scientist witness a chemical reaction? Why or why not?

Answers

yes he witnessed a chemical reaction because the substances combining caused a gas to form, creating a new substance

The scientist witnessed a chemical reaction because a gas was evolved when the two substances were mixed.

A chemical reaction is the same as a chemical change. When a chemical change occurs, atoms recombine to form new substances. Certain occurrences may accompany a chemical reaction such as;

Change in colorEvolution of gasAppearance of a solid in an aqueous phase reactionSudden change in the temperature of the system.

When the scientist mixed purple powder-like substance and a clear liquid together, he noticed that a gas began to bubble out of the mixture. This implies that new substance has been formed so a chemical reaction has taken place.

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Will a nucleus of Zn-65 be stable or unstable?

Answers

Answer:

Unstable

Explanation:

What are the three types of Covalent bonds? and what is the difference between them?
Help!!!
Plsss fastt

Answers

Answer:

Covalent bonds can be single, double, and triple bonds.

Explanation:

Single bonds occur when two electrons are shared and are composed of one sigma bond between the two atoms. Double bonds occur when four electrons are shared between the two atoms and consist of one sigma bond and one pi bond.

How can you prove that air is a matter ?

Answers

Answer:

One way to prove that air is made of matter is to blow up a balloon. Before you add air into the balloon, it is empty and shapeless. When you puff air into it, the balloon expands, so you know it is filled with something—air is taking up space. You'll also notice that a balloon filled with air sinks to the ground.

Explanation:

Energy that is stored is called potential energy. Take a round ball that is at rest at the top of the hill. The ball has a lot of potential energy, but no kinetic energy because it is not moving. Once the ball is released and it begins to roll, the potential energy the ball had initially is transformed into kinetic energy. The higher the ball is placed, the ____ potential energy it will have.
A-more B-less

Answers

The question says that when the ball is placed at the top of the hill it has a lot of potential energy. So I think the higher a ball is placed the more potential energy it will have

The human body has several major systems. Most body systems have multiple functions. Which of the following is NOT a major function of the musculoskeletal system?

A turning food into energy
B helping the lungs take in air
C helping the stomach digest food
D moving the bones of the skeleton

Answers

Answer:D

Explanation:

i got it right LOL

Among the given options, the one which is not a major function of musculoskeletal system is helping the lungs take in air. All others including, energy, digestion, movement of bones etc. are its function.

What are the functions of musculoskeletal system ?

The musculoskeletal system in human body is composed of muscles and bones. The bones in our body are wrapped by the muscles. Muscles helps for the smooth movement of bones.

Muscles convert the chemical energy from food into kinetic energy and use  it for the movement of muscles and bones. Muscles contraction needs intake of energy.

The contraction and relaxation of smooth muscles helps for the easy movement of food through the digestive track. Musculoskeletal system also helps for the movement of other organ system. Hence, option b is not the major function of this organ system.

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How cold does it really get on Pluto's moon, Charon? (I know this is not a Chem question per se, but is there no Earth Science, nor Space, nor Astronomy, nor General Science category on Brainly?)

Answers

Answer:

Explanation:

After various studies and experiments conducted on Pluto's moon, Charon it has been determined that it gets to minus 459.67 degrees Fahrenheit which would be equivalent to minus 273.15 degrees Celsius. This is the coldest temperature that scientists have registered for Charon. This temperature is nearing absolute zero and puts it colder than Pluto itself since Pluto's temperature is believed to get to minus 400 degrees Fahrenheit which is equivalent to minus 240 degrees Celcius.

4. How is a lead storage battery recharged?

a. It is heated up.

b. The pressure on it is increased.

c. A direct current is applied to it.

d. A magnet is held close to it.

Answers

The answer is c Yep Allll day
The answer is c because the lead storage evolves around the current that is directed towards the aplience

Need Help Asap How do islands form

Answers

Explanation:

An island is formed when magma builds up and breaks the ocean's surface. In some cases, like the island of Hawaii, land masses merge together. ... For many volcanoes, formation can take thousands of years, though some volcanic islands can sometimes appear quite suddenly

Answer:

As volcanoes erupt, they build up layers of lava that may eventually break the water's surface. When the tops of the volcanoes appear above the water, an island is formed.

Explanation:

Fire ants move in to a new environment with the lizards.what will most likely happen to the lizard population over the next several years

Answers

Answer:

Some lizards in the eastern U.S. have adapted to invasive fire ants -- which can bite, sting, and kill lizards -- reversing geographical trends in behavioral and physical traits used to avoid predators. A new study describing this reversal appears online on November 29, 2018, in the journal Global Change Biology and reveals that new environmental challenges can override the historical influences that originally determined geographical trends in traits.

"Rapid environmental change, be it from changing climate or the introduction of invasive species, is putting a lot of pressure on native species," said Christopher Thawley, graduate student at Penn State at the time of the study and first author of the paper. "Usually when researchers look at how native species might respond to these kinds of threats, they might measure one characteristic of the animal and at one or a few sites. In this study, we looked at three separate characteristics of eastern fence lizards from thirteen sites spanning a thousand miles and found that these lizards are capable of adapting in a concerted way to meet the threat of invasive fire ants, and in a relatively short time frame."

Explanation:

Sexual reproduction involves male and female sex cells known as ______.

Answers

Answer:

Sexual reproduction involves male and female sex cells known as - Gametes

Explanation:

In sexual reproduction new organisms are produced from the fusion of a male sex cell with a female sex cell. This fusion of gametes is called fertilisation. Sex cells are also known as gametes. Male gametes are made by male reproductive structures. Female gametes are made by female reproductive structures.

which of the following indicates the cathode rays has a large charge to mass ratio?

Answers

Answer:

Gggg

Explanation:

The indication of the cathode rays that has a large charge to mass ratio is there were deflected towards a positive electrode. The correct option is b.

What are cathode rays?

Cathode rays are the rays that move through the negatively charged electrode the cathode charge to the positively charged electrode which is the anode charge in a vacuum tube.

These rays travel through a pipe in a straight line with speed when there is voltage is applied. They are also called electron beams. There is a cathode ray tube, CRT, which is a vacuum tube on which cathode rays travel.

So, the correct option will be for the cathode rays would be deflected towards a positive charge anode.

Therefore, the correct option is b, there were deflected towards a positive electrode.

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The question is incomplete. Your most probably complete question is given below:

They were easily deflected

There were deflected towards a positive electrode

They were deflected towards a negative electrode

They caused a fluorescent screen to glow

How do magnets move objects?​

Answers

Answer: Magnets have a force which is known as no contact force. This force tries to attract the metallic objects near it, which makes it move.

Explanation:

20.What do carbon and silicon have in common?

a.They belong to the same column (family), therefore they have the same number of valence electrons.
b.They belong to the same column (family), therefore they have the same number of total electrons.
c.They belong to the same column (family), therefore they have the same number of energy levels.
d.They belong to the same column (family), therefore they have the same number of protons.

Answers


a.They belong to the same column (family), therefore they have the same number of valence electrons.

PLEASE HELP ME
Anything that has mass and takes up space is
A. Volume
B. Mass
C. Matter
Choose one option
A, B, C


Answers

Answer:

C. Matter

Explanation:

C- matter.....
EXPLANATION:
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