15. What is the name of the part of a cell that allows molecules in, such as glucose and oxygen?
a. Cell wall
b. Ribosome
c. mitochondria
d. Cell membrane
​

Answer:

liquid

Explanation:

Taking into account the definition of molarity, the molarity of a solution that contains 0.75 moles of solute in 0.250 L of solution is 3 moles/L.

Molarity is a measure of the concentration of a solution expressed in the number of moles dissolved per liter of solution.

In other words, molarity indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles of solute÷ volume of solution

Molarity is expressed in units moles/L.

In this case, you have:

Replacing in the definition of molarity:

molarity= 0.75 moles÷ 0.250 L

Solving:

molarity= 3 moles/L

Finally, the molarity is 3 moles/L.

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Answer:

M₂  = 0.16 M

Explanation:

Given data:

Initial volume of solution = 20 mL

Initial concentration = 1.0 M

Final volume = 120 mL

Final/new concentration = ?

Solution:

Formula:

M₁V₁     =    M₂V₂

by putting values,

1.0 M × 20 mL = M₂ × 120 mL

M₂  = 1.0 M × 20 mL / 120 mL

M₂  = 20 M.mL /120 mL

M₂  = 0.16 M

For most bases, sulfuric acid reacts as an acid to form the equivalent sulfate.

Hydrochloric acid is a crucial commodity ingredient utilized largely in the synthesis of phosphate in contemporary industry. Metal makers use it in huge amounts because it is efficient at removing corrosion from iron and steel. The substance sulfuric acid is highly dangerous.

Strong acid that is water soluble is strong acid (H2SO4, oil of vitriol). Among the most widely manufactured compounds, it is employed in the creation of fertilizers, the treatment of ores, and the refinement of crude oil.

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False. The leveling effect refers to the tendency of strong acids to behave as weaker acids in highly polar solvents, such as water.

This effect is caused by the solvation of the proton in the solvent, which reduces its acidity. In the case of sulfuric acid, this effect can prevent the use of sulfuric acid as an acid in some cases, as it may not exhibit its full strength in highly polar solvents. However, it is still commonly used as an industrial strong acid due to its strong acidity and low cost. The leveling effect is a phenomenon observed in Nucleophilic Aromatic Substitution (S N Ar) reactions. It refers to the reduction in the reactivity of a strong electrophile, such as a strong acid, in highly polar solvents. The highly polar solvent can solvate the electrophile, reducing its acidity and reactivity.

In the case of sulfuric acid, the leveling effect can cause it to behave as a weaker acid in highly polar solvents, reducing its ability to function as a strong acid in some cases. However, despite the leveling effect, sulfuric acid is still widely used as an industrial strong acid due to its strong acidity, low cost, and versatility. In less polar solvents, the leveling effect is reduced, and sulfuric acid can exhibit its full strength as a strong acid.

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Answer:

The electron from the ground state to occupy a next energy level. In this case,we say that the electron is excited

Quinine is a well-known, potent, and widely used bitterant that is used as a standard for the bitter taste sensation.

The alkaloid that is generally accepted as a standard for the bitter taste sensation is quinine. It is a crystalline powder that is extracted from cinchona bark, and it is a well-known antimalarial drug. Quinine has a very strong bitter taste that is easily recognizable, and it is used as a standard for measuring the bitter taste of other substances. Quinine is widely used as a bitterant for beverages and foods. In drinks like tonic water, it is added for flavoring, and it is also used in bitters, aperitifs, and liqueurs.

Additionally, quinine is used as a medication for muscle cramps, fever, and malaria. Quinine’s bitterness is believed to be its main characteristic, and it is responsible for the bitter taste in most natural and synthetic bitterants. It is a well-established bitterant, and the taste receptors in the mouth that respond to quinine are some of the most sensitive to bitterness. Overall, quinine is a well-known, potent, and widely used bitterant that is used as a standard for the bitter taste sensation.

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Answer:

I will assume that the moles are all mistyped and will change them to:

4.64, 25.9, and 2.73.

15.2 liters

Explanation:

Both situations can be described using the ideal gas law:  

PV=nRT,

where P, V, and T are the pressure, volume, and temperature (in degrees K).  n is the number of moles.  R is the gas constant.

First NO2 :      P1(25.9L) = (4.64moles)RT

Second NO2: P2V2 = (2.73moles)RT2

Divide one equation by the other:

(P1(25.9L)  =  (4.64)RT1)      

  P2V2 = (2.73)RT2          

The temperatures, pressures, and gas constants are unchanged, so we can cancel those to obtain:

(25.9L)/V2 = (4.64/2.73)

V2 = (25.9L)(2.73/4.64)

V2 = 15.2 Liters

The equation relates the mass of the object, m, and the length of the spring, s is option b  0.3m.

As per the given statement, The length of a spring varies directly with the mass of an object that is attached to it. When a 30-gram object is attached, the spring stretches 9 centimeters.

Therefore, the equation that relates the mass of the object, m, and the length of the spring, s is given as:s = kmHere, k is the constant of variationWe know that when a 30-gram object is attached, the spring stretches 9 centimeters.

Therefore, s = 9 and m = 30We can now write the above equation as follows:9 = k * 30or k = 9/30= 0.3Thus, the equation relating the mass of the object, m, and the length of the spring, s is s = 0.3m.Answer: option b s = 0.3m

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−4000⋅kJ is  heat would be released by its complete combustion.

What is Combustion?

Combustion, a chemical reaction among materials, generally which include oxygen and usually observed by way of the era of heat and light in the form of flame. The charge or velocity at which the reactants combine is excessive, in element because of the character of the chemical response itself and in element due to the fact greater power is generated than can get away into the surrounding medium, with the result that the temperature of the reactants is raised to boost up the reaction even more.

A familiar example of a combustion reaction is a lighted suit. When a in shape is struck, friction heats the head to a temperature at which the chemical substances react and generate extra warmness than can get away into the air, and that they burn with a flame. If a wind blows away the warmth or the chemicals are wet and friction does now not improve the temperature sufficiently, the in shape is going out.

Moles of acetone= 176⋅L×0.788⋅gmL−158.08⋅g⋅mol−1

                             =2.39⋅mol

−4000⋅kJ is  heat would be released by its complete combustion.

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Tests can help the scientist to know the actual compound by interaction with some other compounds.

Many times in the laboratory, we find that we come across samples that are unknown and it is important that the scientist should be able to figure out how we can be able to obtain the precise and accurate information that we need about the compound that is under study.

There are several ways that we can go about trying to find out the nature of a sample that is unknown. The most common way is to conduct a series of chemical reactions or to use various instrumental procedures in order to obtain the required information about the compound.

The way in which a compound interacts with reagents sheds light om what the composition of the compound would be and this is key in the identification of the compound.

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A carbon-hydrogen bond in ethane (CH3CH3) is best described essentially nonpolar. Option B is correct.

A nonpolar bond is one in which electrons are shared equally between atoms.In Ethane, the carbon atom has four valence electrons, while the hydrogen atom has one valence electron. The carbon atom forms four covalent bonds to the hydrogen atoms. Since the hydrogen atoms are equivalent, all of the carbon-hydrogen bonds are identical.

Each of the carbon-hydrogen bonds has a bond distance of 109.5°.Ethane is a hydrocarbon with the formula C2H6. It is an alkane with two carbon atoms. It's also known as a saturated hydrocarbon because all of its carbon atoms are bonded to as many hydrogen atoms as possible. Because of this, it contains only single bonds between atoms.Each carbon in ethane is surrounded by four other atoms and has a tetrahedral geometry.

Since the electronegativity of carbon and hydrogen atoms is quite close, the carbon-hydrogen bonds in ethane are nonpolar and symmetric. Because the electronegativity values of carbon and hydrogen are close, there is no significant polarity between the carbon-hydrogen bonds. Therefore, the carbon-hydrogen bond in ethane is best described as essentially nonpolar.

Therefore, Option B is correct.

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Answer:

When we talk about a compound's mass percent, we want to know how much of that chemical is in a combination or sample. To calculate the mass percent, we must first know how much of the compound we have and how much of everything else we have.

Assume we have a dish of fruits that weights 100 grammes. We'd want to know how much of the fruit is made up of kiwis. We count the kiwis and discover that there are twenty of them.

To calculate the mass % of kiwis, we must first determine how much they weigh in comparison to the rest of the fruits. Assume the kiwis weigh 40 grammes in total. We may use this data to compute the percentage of kiwis in the fruit:

Mass percent of kiwis = (mass of kiwis ÷ total mass of fruits) × 100%

Mass of kiwis = 40 grams

Total mass of fruits= 100 grams

Mass percent of kiwis= (40 grams ÷ 100 grams) × 100% = 40%

So we can say that the fruits is 40% kiwis.

Similarly, when we want to find the mass percent of a compound in a mixture or sample, we need to know how much of that compound we have and how much of everything else we have. We can use the formula I gave earlier to calculate the mass percent of the compound.

which is Mass percent = (mass of compound consumed ÷ total mass of sample) × 100%

Below here is the answer, but i suggest you should give it a try first :)

Molar mass of the compound = 20 grams/mole

Mass of the compound consumed = 2 moles × 20 grams/mole = 40 grams

Total mass of the sample or mixture = 50 grams

Mass percent of the compound = (40 grams ÷ 50 grams) × 100% = 80%

So the mass percent of the compound in the sample is 80%.

Answer:

pH+3.0 normality

Explanation:

The negatively charged atoms are known to show the electron affinity. Hydrogen is more reactive than oganesson based on electron affinity.

The amount of energy released when an electron is added to a neutral atom to create a negatively charged ion is known as electron affinity in chemistry.

Due to the difficulty in determining atoms' electron affinities, values are only known for a small number of chemical elements, primarily halogens.

Similar towards how chlorine can achieve the configuration of noble gases and become an electronegative ion, hydrogen has a high attraction for electrons, becoming the hydrogen anion and obtaining the stable configuration of helium.

The first synthetic element to belong to group 18 (the noble gases), oganesson has the potential to be substantially more reactive than the other members of that group.

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Option 1 is correct. There are three types of UV radiation: UVA, UVB, and UVC. UVC has the shortest wavelength, around 100-280 nm, but is mostly absorbed by the Earth's atmosphere and doesn't reach the surface. UVB has a wavelength of 280-320 nm and is responsible for sunburns and skin damage. UVA has the longest wavelength, around 320-400 nm, and can penetrate deeper into the skin, causing aging and wrinkling.

Option 2 is incorrect because UV radiation, in general, can be damaging to the Earth's surface, causing skin cancer, harming plant life, and contributing to climate change.

Option 3 is partially correct because UV radiation with a wavelength of 300 nm falls within the UVC range, but it's important to note that this type of radiation is mostly absorbed by the ozone layer before reaching the Earth's surface.

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ecologists look at relationships between nature, studying the interactions between humans, animal and plants.

Answer:

Ecologists focus on the relationship of organisms within their environment. Ecology is a branch of biology (biology is the study of life). Given the broad scope of ecology, there are multiple sub-disciplines that an ecologist can choose to focus on. Since all living things (plants, animals, microbes) depend on other living things and a healthy environment to survive, ecologists may specialize in one aspect of an ecosystem. Examples include terrestrial (land), aquatic (water), applied (concepts and principles of ecology), conversation (management of biodiversity), and evolutionary (evolution).

Explanation:

Brainliest plz

Answer:

I hate to not answer and have you repost this if you could repost it with the choices by clicking the arrow I can figure it out a lot faster and I'll copy and paste to show you that it's right

Explanation:

I'm good with history biology sum math so if you want to do what I asked and reposted I can give you the answers and I will show that they are correct I won't just guess like some people do just to get points cuz I don't care about points I just get on here to help people

Answer: The answer for the blanks is initial appearance and than final appearance.

Explanation:

Answer:

                                 heat.

hope i helps

Answer:

b

Explanation:

Answer:

The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be:

TTGAGACGGTA

Explanation:

The primary structure of DNA is a double-stranded helix of nucleotides linked to each other by phosphodiester linkages. The two strands of the DNA molecule is complementary to each other. While one strand is linked in the 3' to 5' direction, the other strand is linked in the 5' to 3' direction. The two strands are held together by hydrogen bonds between the nucleotides of the two strands and this is known as base pairing. In base pairing, adenine nucleotide, A, on one strand forms two hydrogen bonds with thymine nucleotdie, T, in the other strand. Also, guanine nucleotide, G, in one strand, forms three hydrogen bonds with cytidine nucleotide, C, in the complementary strand.

Therefore, once the nucleotide sequence of one DNA strand is known, the nucleotide sequence of the complementary strand can easily be deduced.

The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be: TTGAGACGGTA

The statement that would best explain the observation of no liquid being evident in the sealed bottle is: b. Liquid and vapor are at equilibrium in the bottle.

When liquid and vapor are at equilibrium in a closed system, it means that the rate of condensation (liquid turning into vapor) is equal to the rate of vaporization (vapor turning into liquid). In this case, it appears that all the liquid has vaporized, and no liquid is evident. This suggests that the liquid and vapor have reached a state of equilibrium, where the amount of liquid remaining is negligible compared to the amount of vapor present.

The vapor state is favored when equilibrium is established because the pressure exerted by the vapor phase reaches a point where it equals the vapor pressure of the liquid at that temperature. At this equilibrium point, no further net condensation or vaporization occurs, resulting in the absence of visible liquid in the sealed bottle.


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1-Bromo-1-chloropropane has a bromine atom bonded to the first carbon (C1), a chlorine atom bonded to the second carbon (C2), and the remaining carbons connected in a chain. The highest Newman projection looking down the C1-C2 bond shows the C1 atom in the front, the C2 atom at the back, and the other atoms (Br, C3, and Cl) attached to the C1 atom.

Here's the structure of 1-bromo-1-chloropropane, showing wedges and dashes:

     Br

      |

      C

     /

    C

   /

  C - Cl

To draw the highest Newman projection looking down the C1-C2 bond, we need to imagine looking along that bond with the C1 atom in front and the C2 atom at the back. The attached atoms (Br, C1, C3, and Cl) will be represented as circles.

Here's the highest Newman projection:

      Br

       |

       C3

      /

     C1

    /

   C2

  /

 Cl

The C1 atom is represented by the intersection of the horizontal and vertical lines, while the C2 atom is shown as the circle at the end of the vertical line. The other atoms (Br, C3, and Cl) are attached to the C1 atom, and their positions are represented by their corresponding circles.

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Orthoboric acid is a weak acid with the chemical formula H3BO3. It can react with various compounds to form different products.

Here are the reactions of orthoboric acid with sodium hydroxide and ethyl alcohol:

Reaction with Sodium Hydroxide:

When orthoboric acid reacts with sodium hydroxide (NaOH), it forms sodium borate and water. The balanced chemical equation for the reaction is:

H3BO3 + NaOH → Na[B(OH)4] + H2O

In this reaction, one molecule of orthoboric acid reacts with one molecule of sodium hydroxide to produce one molecule of sodium borate and one molecule of water.

Reaction with Ethyl Alcohol:

Orthoboric acid can react with ethyl alcohol (C2H5OH) to form triethyl borate and water. The balanced chemical equation for the reaction is:

3C2H5OH + B(OH)3 → B(O-C2H5)3 + 3H2O

In this reaction, three molecules of ethyl alcohol react with one molecule of orthoboric acid to produce one molecule of triethyl borate and three molecules of water.

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Answer:

i think its answer B.....

The correct solubility product constant for the reaction shown is Ksp = [Ca2+][F-]2.

The solubility product constant, also known as Ksp, is a measure of the extent to which a sparingly soluble salt dissociates in solution. For the reaction shown, CaF2(s) dissociates into Ca2+ and F- ions. The Ksp expression for this reaction is Ksp = [Ca2+][F-]2, where [Ca2+] and [F-] represent the concentrations of the ions in solution.

The value of Ksp depends on the temperature and pressure of the system, as well as the specific conditions of the reaction. It is important to note that the Ksp value is specific to each individual reaction and cannot be generalized to other reactions. By determining the value of Ksp for a particular reaction, we can calculate the concentrations of the ions in solution at equilibrium, which can be useful in predicting the behavior of the system under different conditions.

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Answer:

1

Explanation:

5÷2=2.5 that means it's 2.5 L for every one ATM

The free energy change, ΔG, is approximately -0.0198 kJ/mol to one decimal place.

To calculate the free energy change, ΔG, we can use the equation:

ΔG = -RT ln(K)

where ΔG is the change in Gibbs free energy, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin, and K is the equilibrium constant.

In this case, we are given the partial pressures of CH3OH, P(CH3OH) = 110.0 mmHg and P(CH3OH) = 14.00 mmHg, respectively.

First, we need to calculate the equilibrium constant, K, using the ratio of the partial pressures:

K = P(CH3OH) / P(CH3OH)

K = (110.0 mmHg) / (14.00 mmHg)

K ≈ 7.857

Next, we need to convert the pressure from mmHg to atm because the gas constant R is expressed in J/mol·K, which is based on the unit of atm:

1 atm = 760 mmHg

So, P(CH3OH) = 110.0 mmHg = 110.0 mmHg / 760 mmHg/atm ≈ 0.145 atm

P(CH3OH) = 14.00 mmHg = 14.00 mmHg / 760 mmHg/atm ≈ 0.0184 atm

Now we have the equilibrium constant, K, and the pressures in atm. We can proceed to calculate the free energy change, ΔG:

ΔG = -RT ln(K)

Let's assume the temperature, T, is given as 298 K:

ΔG = -(8.314 J/mol·K) * (298 K) * ln(7.857)

ΔG ≈ -19.78 J/mol

To convert the free energy change from joules to kilojoules, we divide by 1000:

ΔG ≈ -0.0198 kJ/mol

It's important to note that the free energy change depends on the temperature and the equilibrium constant of the reaction. If the temperature or the equilibrium constant changes, the calculated value of ΔG will also change.

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Answer: A. They were traveling through different types of rocks

Explanation: