Pure ethylenediamine(ED), H2NCH2CH2NH2 , is a liquid with a density of 0.896 g/ml. What mass of this compound would be needed to prepare 1.00 liter of a 0.030 M solution? What volume of pure ED would this mass correspond to?

Answer:

Octabromopropane or  PubChem

Answer:

its the middle one

Explanation:

the suns rays bounce off the planet easier at a lower angle.

Answer:

the middle option would heat up the least.

Explanation:

Answer:

3, 2, 4, 1

Explanation:

That's the correct sequence

Solution with a pH of 2 is 100 times more acidic than a solution with a pH of 4. The correct answer is d. 100.

A solution with a pH of 2 is how many times more acidic as a solution with a pH of 4?

To determine this, follow these steps:

Step 1: Calculate the difference in pH levels.
Difference = pH of 4 - pH of 2 = 4 - 2 = 2

Step 2: Use the formula for comparing acidity levels.
Acidity Ratio = 10^(Difference) = 10⁻²

Step 3: Find the answer.
Acidity Ratio = 100

Solution with a pH of 2 is 100 times more acidic than a solution with a pH of 4. The correct answer is d. 100.

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Answer:

2.173 moles of ethanol is presented in a 100.0g sample of ethanol .

Explanation:

The amount of substance that contains as many Particles as there are atoms in exactly 12g of carbon- '12 isotope is called 1 mole '= 46 u.

When calcium and oxygen interact, calcium oxide is created. Calcium oxide has the chemical formula CaO. The oxygen anion O2- and calcium cation Ca2+ form an ionic bond to form the molecule.

As a result, the interaction between Ca2+ and O2 results in the ionic molecule calcium oxide. The chemical name is CaO.

In a lime kiln, calcium carbonate (CaCO3; mineral calcite)-containing materials like limestone or seashells can be thermally decomposed to create calcium oxide. Calcination is the name of the method used to manufacture burnt lime.

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Answer:

For the most part, how much a compound you can break up in a particular dissolvable is restricted. Sooner or later the arrangement becomes soaked. This intends that assuming you add a greater amount of the compound, it won't break up any longer and will stay strong all things considered.The term 'solvable' is applied to countless compound substances which are utilized to break down or weaken different substances or materials. They are generally natural fluids. Numerous solvents are likewise utilized as synthetic intermediates, fills, and as parts of a great many items.

Increase endeavors imply examination concerning potential cycle perils, figuring out response energy and thermodynamics, recognizing and describing contaminations, blending and mass exchange studies, heat move and intensity evacuation concentrates as well as crystallization and polymorph control.

Explanation:

It is relatively more noteworthy in sum than the solute. Like impetuses, a few solvents don't partake in synthetic responses. They just act as the response medium to empower synthetic responses to happen all the more quickly

It's critical that the two solvents are immiscible, on the grounds that then it is not difficult to isolate them from one another. The top fluid can be drawn off with a pipet, or the base layer can be depleted out by means of a stopcock. The mixtures that disintegrated in the ether have accordingly been isolated from the water-dissolvable mixtures.

You must add the base measure of bubbling dissolvable to get an immersed arrangement. On the off chance that you add a lot of dissolvable, the arrangement might be excessively weaken for gems to shape.

Specialized periodicals in which scientists publish the results of their works are called scientific journals.

In educational publishing, a scientific journal is a periodical book intended to similarly the progress of technology, typically by way of reporting new studies.

Journal articles may include original research, re-analyses of studies, opinions of literature in a selected place, proposals of new but untested theories, or opinion pieces.

These scientific journals include the following.

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Answer:

true

Explanation:

Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them. For an acid with a polyatomic ion, the suffix “-ate” from the ion is replaced with “-ic.”

The concentration of acetic acid in the vinegar solution is approximately 1.678 M.

To calculate the concentration of acetic acid (CH3COOH) in units of molarity (M), we need to use the formula:

Molarity (M) = Moles of solute / Volume of solution (in liters)

First, let's calculate the moles of acetic acid (CH3COOH) using its molar mass:

Molar mass of acetic acid (CH3COOH) = 60.052 g/mol

Mass of acetic acid = 50.4 g

Moles of acetic acid = Mass / Molar mass = 50.4 g / 60.052 g/mol = 0.839 mol

Next, we need to convert the volume of the solution from milliliters (mL) to liters (L):

Volume of solution = 500 mL = 500/1000 L = 0.5 L

Now, we can substitute the values into the formula to calculate the molarity:

Molarity = Moles of solute / Volume of solution = 0.839 mol / 0.5 L = 1.678 M

Therefore, the concentration of acetic acid in the vinegar solution is approximately 1.678 M.

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Answer:

Endothermic reaction.

Explanation:

The reactants are at a lower energy rate than the products. Because delta H is positive, energy is absorbed from the surroundings.

Answer:

Molarity = 0.72M

Molality = 0.85M

Explanation:

Molarity and molality are two measures of molar concentration, and they can be calculated as follows:

Molarity = number of moles/volume of solvent

Molality = number of moles/mass (kg) of solvent

Mole = mass/molar mass

Molar mass of stilbene (C14H12) = 12(14) + 1(12)

= 168 + 12

= 180g/mol

mole of stilbene = 13/180

mole = 0.072mol

Volume = 100mL = 0.1L

molarity = 0.072/0.1

Molarity = 0.72M

Molality = number of moles ÷ mass (kg) of solvent

To get mass of solvent, we use;

Density = mass/volume

Mass = density × volume

Mass = 0.85g/mL × 100mL

Mass = 85g

Mass in kg = 85/1000 = 0.085kg

Molality = 0.072/0.085

Molality = 0.847M

Molality = 0.85M

The Bohr model explains the observations by suggesting that electrons exist in specific energy levels and transitions between these levels cause the observed colors.

The Bohr model of an atom explains the observations of line spectra and quantized energy levels. Line spectra is a phenomenon where atoms emit or absorb light at specific wavelengths. Quantized energy levels refer to the specific energies that electrons can possess while occupying specific energy levels.

The Bohr model explains both of these observations by proposing that electrons can only exist in specific energy levels and can move between them by absorbing or emitting photons of specific energies. An electron in an atom can exist only in one of the allowed energy levels.

These energy levels are defined by the Bohr radius formula:

\(r(n) = n^2 * h^2 / 4\)π\(^2mke^2\)

Where r(n) is the radius of the nth energy level, n is an integer representing the energy level, h is Planck's constant, m is the mass of the electron, ke is Coulomb's constant, and e is the charge of the electron.Electrons emit light when they move from a higher energy level to a lower one and absorb light when they move from a lower energy level to a higher one.

The energy of the photon emitted or absorbed is equal to the difference in energy between the two levels. This explains why line spectra occur, as each atom emits or absorbs light at specific wavelengths corresponding to the energy difference between its allowed energy levels.The Bohr model's proposal of quantized energy levels provides an explanation for the stability of atoms. Electrons in an atom can't exist between energy levels, so they can't radiate energy and spiral into the nucleus.

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When we mix several drops of two aqueous solutions and an insoluble precipitate is formed then we may expect to see a cloudy appearance.

In performing chemical reactions when some quantity of two solutions are mixed together and formation of a solid form of residue takes place beneath the liquid, then such reactions are known as precipitation reactions. In double displacement reaction between two different solutions, the insoluble salts separates out to form precipitate. For example in the reaction between sodium hydroxide and copper sulphate, copper hydroxide gives a pale blue precipitate.

2NaOH(aq) + CuSO₄(aq)  →  Cu(OH)₂ (s) + Na₂SO₄ (aq)

                                            pale blue ppt

Hence, these insoluble precipitates gives a cloudy appearance to the solution. They are mostly coloured or white.

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Answer:

Volume of gas when release form tank = V₂ = 2026.67 L

Explanation:

Given data:

Initial volume of gas =V₁= 10.0 L

Pressure of gas inside tank =P₁= 30400 mmHg

Volume of gas when release form tank =V₂=  ?

Pressure at peak =P₂= 150 mmHg

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

30400 mmHg × 10.0 L =  150 mmHg × V₂

V₂ = 304000 mmHg. L/  150 mmHg

V₂ = 2026.67 L

Answer:

its a

Explanation:

yw

The respiratory and circulatory systems work together to maintain the homeostasis of the human body. The circulatory system is the transport system for the respiratory system. The correct option is A.

The network of organs and tissues which help us to breathe is defined as the human respiratory system. The main function of this system is to introduce oxygen into the body and to expel carbon dioxide from the body.

The human circulatory system consisting of arteries, veins and capillaries provide all the essential nutrients, minerals and hormones to the various parts of the body.

The respiratory system does not work alone in transporting oxygen through the body. The oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen rich blood to tissues and cells.

Thus the correct option is A.

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Answers:

Aluminium Iodide

(AlI³)

In methane, the covalent bond is present between one carbon and four hydrogen atoms.

Methane is the simplest form of saturated hydrocarbons. Methane is an odorless gas as well as a colorless gas. It has one carbon and four hydrogen atoms which is why methane is also called a tetrahedral molecule.

CH₄ is the chemical formula of methane and is a non-toxic but flammable gas. From the tetrahedral structure of methane, we can see that a carbon atom is bonded to four hydrogen atoms.

One molecule of methane contains four covalent bonds. Each covalent bond is formed between the carbon and one hydrogen atom. The formation of a covalent bond between carbon and hydrogen is due to the small electronegativity difference between carbon and hydrogen.

In this way, carbon completes its octet and hydrogen completes its duplet. Therefore, the covalent bond is formed between one carbon atom bond with four hydrogen atoms in methane.

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Answer:

V = 56.816 cm³

Explanation:

Given that,

The measured value of the cylinder is 54.5 cm³

The percent error in the measurement of the volume is 4.25%

We need to find the actual volume of the cylinder.

Firstly, we can find the error in the calculation as follows :

\(E=54.5 \times \dfrac{4.25}{100}=\pm2.316\)

It is mentioned in the problem that, the teacher told her that she was 4.25% too high in her determination of the volume. It would mean that,

Total volume = 54.5 + 2.316 = 56.816 cm³

Hence, the actual volume of the cylinder is 56.816 cm³.

Answer:

D) two unhybridized p orbitals

Explanation:

In covalent bond, to form a bond, each of the two participating atoms would put down an  unpaired electron to be used in forming a shared pair of electrons between them.

There are two types of covalent bonds:

A sigma bond \(\sigma\)

A pi bond \(\pi\)

A sigma bond is formed when a hybrid orbital (sp,sp² and sp³) overlaps with another hybrid orbital or with s- or p- orbital.

A pi bond is formed when a p-orbital overlaps with another parallel p-orbital laterally. This implies that ,a  π bond could be formed from the overlap of two unhybridized p orbitals.

Answer:

Evaporation

Explanation:

The water evaporated when heat was added causing the water to go.

Answer:

When water is heated the molecules move faster and since they vibrate the evaporate.

Explanation:

sciense :)

To prepare 100 mL of a 5 M hydrochloric acid solution from concentrated HCl (12.1 M), you will need to dilute the concentrated HCl. You will need to calculate the amount of concentrated HCl needed to make the solution.

To prepare 100 mL of a 5 M hydrochloric acid solution from concentrated HCl (12.1 M), follow these steps:

1. Determine the amount of concentrated HCl needed using the dilution equation: M1V1 = M2V2. Here, M1 is the initial concentration (12.1 M), V1 is the volume of concentrated HCl needed, M2 is the final concentration (5 M), and V2 is the final volume (100 mL).
2. Plug in the known values into the equation: (12.1 M)(V1) = (5 M)(100 mL).
3. Solve for V1: V1 = (5 M × 100 mL) / 12.1 M ≈ 41.3 mL.
4. Measure out 41.3 mL of concentrated HCl using a graduated cylinder or pipette.
5. Add the 41.3 mL of concentrated HCl to a volumetric flask or beaker.
6. Gradually add distilled water to the flask or beaker containing the concentrated HCl, stirring gently, until the total volume reaches 100 mL. This will dilute the concentrated HCl to a 5 M solution.
7. Make sure to properly label the container holding the 5 M hydrochloric acid solution.

By following these steps, you will have successfully prepared 100 mL of a 5 M hydrochloric acid solution from concentrated HCl (12.1 M).

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Answer:

b

Explanation:

When a phase change occurs, the temperature of the matter will remain constant until the phase change is complete.

This is because the energy that is added to or removed from the matter during a phase change is used to either break or form intermolecular bonds between the particles in the substance, rather than to increase or decrease the kinetic energy of the particles.

For example, during the melting of ice, the temperature of the ice remains constant at 0 degrees Celsius until all of the ice has melted. Similarly, during the boiling of water, the temperature of the water remains constant at 100 degrees Celsius until all of the water has boiled off.

Once the phase change is complete, the temperature of the matter will either increase or decrease again, depending on whether heat is being added to or removed from the substance. This is because the kinetic energy of the particles in the substance is once again affected by the addition or removal of heat.

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This problem is giving information about the proton concentrations of three solutions at 25 °C. Despite they are not numerically given, we can propose three scenarios to see how to approach the question.

Let the following solutions to come up:

[H⁺] = 2.63x10⁻³ M

[H⁺] = 1.00x10⁻⁷ M

[H⁺] = 4.511x10⁻⁹ M

The first step, will be the calculation of the pH for each solution via:

pH = -log([H⁺])

So that they turn out to be:

pH = -log(2.63x10⁻³ M) = 2.580

pH = -log(1.00x10⁻⁷ M) = 7.000

pH = -log(4.511x10⁻⁹ M) = 8.3457

In such a way, since acidic solutions have a pH below 7, neutral have a pH equal to 7 and basic have it above 7, we infer the first one is acidic, second one is neutral and third one is basic.

Thus, you can reproduce this methodology with the proton concentrations you are given.

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Assuming that the solution is ideal and follows Raoult’s law, the molar mass of the compound is 16.8 g/mol.

To calculate the molar mass of the compound, and we are to assume that the solution is ideal and follows Raoult’s law. According to Raoult’s law, the partial vapor pressure of a component of an ideal solution is proportional to its mole fraction.

Mole fraction is the ratio of the number of moles of a particular component to the total number of moles of the solution. It is given as:

Total number of moles of the solution = Number of moles of the first component + Number of moles of the second component + …. + Number of moles of the nth component.

Mole fraction of the first component = Number of moles of the first component/Total number of moles of the solution.

Mole fraction of the second component = Number of moles of the second component/Total number of moles of the solution.

Mole fraction of the nth component = Number of moles of the nth component/Total number of moles of the solution.

So, we know that the vapor pressure of the solution is equal to the sum of the vapor pressures of each component of the solution. Therefore, we can write:

Psolution = P1 + P2 + P3 + …… + Pn

Here, P1, P2, P3, ….. , Pn are the vapor pressures of the components of the solution. And, Psolution is the vapor pressure of the solution.

Mass of the solute (Non-volatile organic compound) = 20.3 g

Mass of the solvent (Benzene) = 500 g

Vapor pressure of pure benzene at 60.6 °C = 53.3 kPa

Vapor pressure of the solution = 51.4 kPa

Molar mass of benzene = 78.11 g/mol

We can find the mole fraction of benzene and the solute as:

Mass of benzene = 500 g

Molar mass of benzene = 78.11 g/mol

Number of moles of benzene = mass/molar mass = 500/78.11 = 6.399 mol

Mole fraction of benzene = Number of moles of benzene/Total number of moles of the solution = 6.399/(6.399 + Number of moles of the solute)

We know that, according to Raoult’s law:

P1 = (Mole fraction of benzene) × (Vapor pressure of pure benzene at 60.6 °C)

P2 = (Mole fraction of the solute) × 0 [Because the compound is non-volatile.]

Psolution = P1 + P2

Psolution = (Mole fraction of benzene) × (Vapor pressure of pure benzene at 60.6 °C) + 0.0 = (6.399/(6.399 + Number of moles of the solute)) × (53.3 kPa)

The vapor pressure of the solution is given as 51.4 kPa. Hence, we can write:

(6.399/(6.399 + Number of moles of the solute)) × (53.3 kPa) = 51.4 kPa

By solving the above equation, we can find the number of moles of the solute.

Number of moles of the solute = 1.205 mol

Molar mass of the solute can be calculated as follows:

Molar mass of the solute = Mass of the solute/Number of moles of the solute = 20.3 g/1.205 mol = 16.8 g/mol

Therefore, the molar mass of the compound is 16.8 g/mol.

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True. The relative concentrations of ATP and ADP play a critical role in controlling the cellular rates of the citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid (TCA) cycle.

The citric acid cycle is a series of reactions that occur in the mitochondria and generates energy by oxidizing acetyl-CoA. This energy is stored in the form of ATP, which is used to power various cellular processes.

When the cellular ATP levels are high, the rate of the citric acid cycle slows down because the cell has sufficient energy and does not need to produce more. On the other hand, when the cellular ATP levels are low, the rate of the citric acid cycle increases to produce more ATP.

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