Someone pls help me. I will mark you brainliest.

Answer:

A. body muscles

The pressure needed to pump blood back to the heart is produced by the body muscles .

The Ksp shows the extent of dissolution of a solute in solution. The Ksp of the solution is 2.5 * 10^-4.

The Ksp is an equilibrium constant that is usd to show the extent of solubility of a solute in solution.

The equation for the solution of X2S is;

X2S(s) ⇄2X^+(aq) + S^2-(aq)

Ksp = [2s]^2 [s]

Since s =  0.0395 M

Ksp = 4s^3

Ksp = 4[0.0395 ]^3

Ksp = 2.5 * 10^-4

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A chemist is using a solution of HNO₃ that has a pH of 3.75. what is [H⁺] for the solution is 1.7 × 10⁻⁴M.

Concentration of H⁺ ion will be calculated by using the below equation of pH as:

pH = -log[H⁺]

or [H⁺] = [tex]10^{-pH}[/tex]

Given that, pH = 3.75

So concentration of H⁺ ion will be calculated as:

[H⁺] = [tex]10^{-3.75}[/tex]

[H⁺] = 1.7 × 10⁻⁴M

Hence concentration of H⁺ ion is 1.7 × 10⁻⁴M.

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the answer will be 190

Explanation:

because R1= 0.5*0.5*8

=190

Answer:

it's bright where you can see it it's not that bright compared to the sun from Earth it's really not so bright

Answer:

4.9 kPa

Explanation:

Dalton's law of partial pressures states that the total pressure of a mixture of gases is the sum of the partial pressures of the individual gases.

In other words:
[tex]\displaystyle P_T = P_\text{O$_2$} + P_\text{N$_2$} + P_\text{He}[/tex]

The total pressure is 101.1 kPa. The partial pressure of He is 80.1 kPa. The partial pressure of N₂ is 16.2 kPa. Substitute and solve for O₂:

[tex]\displaystyle \begin{aligned} (101.2\text{ kPa}) & = P_\text{O$_2$} + (16.2\text{ kPa}) + (80.1\text{ kPa}) \\ \\ P_\text{O$_2$} & = 4.9\text{ kPa}\end{aligned}[/tex]

In conclusion, the partial pressure of oxygen in the balloon is 4.9 kPa.

The true statemments that reflect the nature of the compound are statements (i) and (ii).

The molecule acrylonitrile has thre carbon and hydrogen atoms and one nitrogen atom. The  c—c single bond results from overlap between an sp hybrid and an sp 2 hybrid. Also, there are two unhybridized p orbitals on the N atom.

Hence; among  the options, the true statemments that reflect the nature of the compound are statements (i) and (ii).

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Answer:

Eye Health Problems.

Vision-Related Accidents.

Deterioration of Materials.

Explanation:

true

Answer:

See below

Explanation:

Isotopes:

Example:

[tex]\rule[225]{225}{2}[/tex]

Any group of an element's isotopes will always contain an equal amount of protons and electrons. Their individual nuclei's capacity for holding neutrons will vary. The correct options are B, D, and F.

A set of atoms with the same atomic number but differing masses is known as an element's isotope. This indicates that the number of protons in each atomic nucleus and the number of electrons in the electron cloud of each isotope of an element is the same.

Some isotopes experience radioactive decay because of their unstable atomic nucleus. These isotopes are known as radioisotopes (or radionuclides) because they are radioactive by nature. Carbon-14, tritium (hydrogen-3), chlorine-36, uranium-235, and uranium-238 are a few examples of radioactive isotopes.

Thus the correct options are B, D, and F.

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Answer:

Rain,Hail,Snow,sleet. Hope this helped you out!

1 - In what organelle or membrane are triacylglycerols synthesized and fatty acids elongated?

A - Lysosomes

B - Peroxisome

C - Endoplasmic reticulum

D - Ribosomes

E - Nucleus

The answer is Endoplasmic reticulum

Answer:

I think it is C. Temperature, sorry if wrong.

Answer:

No, not all are harmful.

Explanation:

There are bacterias that are harmful, yes, but millions, maybe even billions are helpful. Probiotics, healthy bacteria, as some like Lactobacilli and Bifidobacterium. There are a lot more, but just these two examples are helpful. Lactobacili is helpful with your digestive system. Bifidobacterium is geared towards your mouth and the vaginal area of women in mammals, like humans.

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I hope this helps!

-No one

Answer:

The temperature of the solute/solvent without any external effect would decrease.

Explanation:

As the bonding between the solute particles is really strong, therefore a large amount of energy is required to overcome these forces. So that the new bonding between the solute and solvent is created.

In order to achieve this, there will be a lot of energy required and that is through the heating process. So the solution will require energy so the solute will dissolve fully either by provision of external force i.e stirring or by heating.

Explanation:

Answer:

multiply (make new cells)

The percent yiled shows the extent of conversion of reactants to products. The percent yiled here is 83.1%.

The percent yiled in a reaction is calculated as te ratio of the actual yield to the theoretical yiled multiplied by 100.

Hence the balanced reaction equation is; Fe3O4 + 4CO → 3Fe + 4CO2.

Number of moles of Fe3O4  =  70.0 g/232 g/mol = 0.3 moles

Number of moles of CO = 70.0 g/28 g/mol = 2.5 moles

If 1 mole of Fe3O4  reacts with 4 moles of CO

x moles of Fe3O4 reacts with 2.5 moles of CO

x = 0.6 moles

Hence, Fe3O4  is the limiting reactant.

Now;

1 mole of Fe3O4 yileds 3 moles of Fe

0.3 moles of Fe3O4 yileds 0.3 moles * 3 moles/1 mole = 0.9 moles

Mass of Fe produced = 0.9 moles  * 56 g/mol = 50.4 g

Percent yield = 41.9 g/ 50.4 g * 100/1 = 83.1%

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Answer: A

Explanation:

trust me i did it

The characteristic of a strong base is that it removes H⁺ ions from solution.

Strong bases are those substance which have a pH range in between the value of 7.1 to 14.

So, strong bases removes H⁺ ion from the solution.

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Answer:

It removes H+ ions from solution.

Explanation:

i got it right

Answer:

Surveys

Explanation:

Martin can make an interaction with people and take surveys to know whether people likes the new flavors.

Surveys are research techniques used to gather data from a designated group of respondents in order to learn more and acquire insights into a range of interesting topics. Depending on the methodology chosen and the objective of the study, they can be conducted in a variety of methods and serve a variety of objectives.

Direct questions to clients are the best approach to get information from them. Surveys are a good way to achieve it if you have a well-thought-out strategy.

Companies can use surveys to gather data to develop strategies and maintain the satisfaction of their employees and consumers while looking for solutions based on the results.

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ANSWER DISCLAIMER; IF DISSATISFIED, REPORT THIS ANSWER AS SOON AS POSSIBLE:

Answer:

The motion of the gas particles is random and in a straight-line.

Explanation:

According to the kinetic hypothesis, a gas is made up of a huge number of submicroscopic particles (atoms or molecules) that are all in continual, random motion. The swiftly moving particles clash with one another and with the container's walls on a regular basis. The phrase ideal gas refers to a hypothetical gas made up of molecules that adhere to a few rules: The molecules of an ideal gas do neither attract or repel one another. The sole interaction between perfect gas molecules would be an elastic collision when they collided or an elastic collision with the container's walls.

Answer:

[tex]pH = -log(H3O^+) = -log(8.52E-5) = 4.+[/tex], my guess is about 4.1

Explanation:

hope this helps! :)

It is true that decomposers such as bacteria recycle dead tissue into reusable chemicals for other producers, which are then eaten by consumers.

Nutrient recycling is the process by which essential elements in the ecosystem are in transition between abiotic and biotic factors.

In an ecosystem, the following groups of organisms exists:

Decomposers are responsible for breaking down dead tissues of living organisms leading to the release of nutrients to the soil. These nutrients are used by producers, which are then eaten by consumers.

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Answer:

The correct answer is A and D.

Explanation:

Please I want brainliest.

Reason:

The size of the ions follows the order:

Negatively charged ion > Neutral atom >

Positively charged ion

This is because of the size of ions increases when the electrons are added to the outermost shell of an atom.

This happens due to the increase in

electron-electron repulsion.

Moreover, when the electrons are removed from an atom, then the affective nuclear charge that is experienced by the outermost electron increases.

Thus the size of the positively charged ion is least.

Answer:

C

Explanation:

As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off.

Answer:

don't know just supporting u

Among the given aqueous solutions, the solution with a significantly different pH from the rest is 0.1 M HC₂H₃O₂ (acetic acid).Option C

H₂SO₄ (sulfuric acid), HNO₃ (nitric acid), and HCl (hydrochloric acid) are strong acids that dissociate completely in water. They produce a high concentration of H₃O⁺ ions, resulting in a low pH. Acetic acid, on the other hand, is a weak acid that only partially dissociates in water. It produces a smaller concentration of H₃O⁺ ions, resulting in a higher pH compared to the strong acids.

When a strong acid like HCl, H₂SO₄, or HNO₃ is dissolved in water, it completely dissociates to release H₃O⁺ ions. The resulting solution will have a very low pH, usually close to 0. However, acetic acid (HC₂H₃O₂) only partially dissociates, and the concentration of H₃O⁺ ions is lower. As a weak acid, it has a higher pH compared to strong acids, typically around 2.4.

In summary, among the given options, the aqueous solution of 0.1 M HC₂H₃O₂ (acetic acid) will have a significantly different pH from the rest, with a higher pH value due to its weak acid nature.

Option C

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