How many moles of tetracycline (C₂₂H₂₄N₂O₈) are in 71.9 grams

Answer:

Explanation:

Based on a pH scale, the chemical compound which is classified as an acid is: A. Hydrogen fluoride (HF).

A pH scale can be defined as a tool that is designed and developed for the measurement of the molar concentration of hydrogen ions (H⁺) in both acidic and alkaline (basic) solutions.

This ultimately implies that, a pH scale can be used to measure and specify the acidity, neutrality or basicity of any chemical solution.

In this scenario, the pH of each of the given chemical compound are as follows:

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Answer:

c is answwe

Explanation:

none of these

The difference between voltaic and electrolytic cells is that voltaic cells generate electricity through a spontaneous reaction while electrolytic cells absorb electricity to drive a non-spontaneous reaction. option A is correct.

Voltaic cells are spontaneous chemical reaction happens at which results in the generation or production of electrical energy or electricity. voltaic cell are made on basis on with modern-day batteries.

Electrolytic cells are the cells which do not generate  electricity with the help of a chemical reaction, instead of it electrolytic cell creates a useful chemical reaction with the help of an externally applied potential or external applied energy difference.

Therefore, voltaic cells generate electricity through a spontaneous reaction while electrolytic cells absorb electricity to drive a non-spontaneous reaction. option A is correct.

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K1 and K2 are related algebraically because once the values are inserted into the equilibrium equation, both equations will yield a denominator of 100.

There are various variants of Cov id virus. The Brazilian variant P also known as Gamma variant is the third variant of the original SARS-CoV2.

The correct answer is more negative

This variant has raised concerns since it has ability to spread more quickly then previous variants and this is more negative variant.

It is assumed that Cov id variant Gamma and Delta has ability to absorb move UV light but this is not proved yet and research is underway.

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Answer:

53.28%

(you could also write 55.33%, but I rounded it so just go with the answer above ---> 53.28%)

Explanation:

Vanadium(II) sulfate

Vanadium(III) sulfate is the inorganic compound with the formula V2(SO4)3

Answer:

the object will regain its original form as soon as the deforming force is removed. ... Flexibility means the object is just easily deformed, and will stay that way.

Explanation:

Edit : OPTION C is the answer

Option B is the best, Even though the cost is 30 Billion it essentially takes Lesser time to construct. For Plan A, They would have to construct the overground railway and then take a lot of time and effort to create wildlife corridors and then plant trees. Plan B takes much less time compared to plan A and might as well have a lesser impact on the environment!

Answer:

For a given element, the number of postively charged, massive nuclear particles, the number of protons, is fixed. ... Because the number of protons determines Z , the atomic number, which determines the identity of the atom. The nucleus can also contains neutrons, massive, neutrally charged nuclear particles.

Explanation:

Explanation:

What you need to know.

hope it's helpful

A polar bond is when atoms have unequal attractions for electrons and so the sharing is unequal.

Electromagnetivity is the ability of an atom to attract electrons when atoms are in a compound.

To determine the electromagnetivity of an atom:

< 0.5 - Non-Polar

0.5 - 1.7 - Polar

Therefore, unequal sharing results in either a hydrogen or dipole bond.

Hydrogen bonding is just a special case of dipole-dipole interactions as hydrogen is partially positive in the molecule. When covalently bonded to a highly electronegative element, the hydrogen atom becomes so highly partial positive while the other so partial negative that a higher amount of interaction is obtain.However, keep in mind that hydrogen bonding can ONLY occur when hydrogen is covalently bonded to fluorine, oxygen and nitrogen.

A dipole-dipole interaction occurs between opposite partial charges in polar molecules. These attractions are generally weaker than hydrogen bonding.

London dispersion forces occurs in all bonds, as it's a temperorary attraction force when electrons in an atom occupy positions that form temporary dipoles. It's notable particularly in noble gases and it's the weakest of the intermolecular forces.

Answer:

“Magma” is exclusively found and formed beneath the earth’s surface. Once magma is on or above the surface of the earth it is referred to as “lava.” Magma is typically formed by extreme temperature melting solid rock within the earth. Pressure and rock composition can also affect magma formation. High pressure can help magma be “squeezed” from partially molten rock. Likewise, as rocks are usually composed of different minerals with different melting points, magma formation from rocks is usually only partial and uneven.

Explanation:

1) Based on the crystal field strength, Cl ligand would give the longest d-d transition when complexed with Ti(III). as this is the weak field igand and would cause minimum splitting of d orbitals.

Taking into account its definition, the correct answer is option D) Chromatography.

Chromatography is a method that allows the separation, identification and determination of chemical components in complex mixtures. By means of a chromatography it is possible to separate analytes that are very similar to each other in terms of their physico-chemical properties.

For the separation to occur, the principle of selective retention is used, which consists of the different behavior of the components of a mixture on a specific support (such as paper, a gas, a liquid) and a flowing liquid or gaseous phase. through the bracket.

In other words, there is a stationary phase immobilized on a support and a mobile phase that will drag the sample through the stationary phase. During this process, each component of the sample will move according to its own physicochemical characteristics. The general concept will be that those components that prefer the stationary phase are more retained, while those that prefer the mobile phase will move faster.

In summary, the components of the sample are distributed between two phases of different nature, as a consequence of the speed variation that is established when being dragged by a mobile, liquid or gaseous phase, through a stationary, solid or liquid phase.

Finally, the correct answer is option D) Chromatography.

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Answer:

I think C (synthesis of biological compounds

Explanation:

have a nice day

Answer:

group 1 elements(hydrogen,sodium,etc)

Explanation:

bexause if noticed all the element in the same group have the same eletron in thr outer most shell for example the group 1 elements are said to have 1 outermost elect ron which make them react so the same

Answer:

Choice A. [tex]\rm H_{2}[/tex] would be produced at the negative electrode.

Explanation:

Ionic equation for this reaction:

[tex]2\, {\rm K^{+}} + 2\, {\rm Cl^{-}} + {2\, \rm H_{2} O} \to {\rm H_{2}} + {\rm Cl_{2}} + 2\, {\rm K^{+}} + {\rm 2\, OH^{-}}[/tex].

Net ionic equation:

[tex]2\, {\rm Cl^{-}} + 2\, \rm H_{2} O} \to {\rm H_{2}} + {\rm Cl_{2}} + 2\, {\rm OH^{-}}[/tex].

Half-equations:

[tex]2\, {\rm Cl^{-}} \to {\rm Cl_{2}} + 2\, {e^{-}}[/tex].

(Electrons travel from the solution to an electrode.)

[tex]2\, {\rm \overset{+1}{H}_{2} O} + 2\, {e^{-}} \to \overset{0}{\rm H}_{2} + 2\, {\rm O\overset{+1}{H}\!^{-}}[/tex].

(An electrode supply electrons to the solution to reduce some of the [tex]\rm H[/tex] atoms from [tex]\rm H_{2}O[/tex].)

In a DC circuit, electrons always enter the circuit from the negative terminal of the power supply and return to the power supply at the positive terminal.

The negative electrode is connected to the negative terminal of the power supply. Electrons from the power supply would flow into the solution through this electrode.  

This continuous supply of electrons at the negative electrode would drive a reduction half-reaction. In this question, that corresponds to the reduction of water: [tex]2\, {\rm \overset{+1}{H}_{2} O} + 2\, {\rm e^{-}} \to \overset{0}{\rm H}_{2} + 2\, {\rm O\overset{+1}{H}\!^{-}}[/tex]. Hence, [tex]\rm H_{2}[/tex] would be produced at the negative electrode.

Answer:

0.0061650760770388 mole

Answer:

4/15

Explanation:

15/15 - 11/15 = 4/15

If 11/15 is the probability that it'll rain tomorrow, then the rest should be the probability that it'll not rain tomorrow.

Answer:

D. -80m/s^2

Explanation:

V = u + at

5 = 65 + a (0.75)

0.75a = -60

a = -60/0.75

a = -80m/s^2

Therefore, is decelerating at 80m/s^2

Answer:

[tex]\boxed {\boxed {\sf D. \ 80 \ m/s^2 \ down}}[/tex]

Explanation:

We are asked to find the acceleration of a skydiver. Acceleration is the change in velocity over the change in time, so the formula for calculating acceleration is:

[tex]a= \frac{v_f-v_i}{t}[/tex]

The skydiver was initially traveling 65 meters per second, then he slowed down to a final velocity of 5 meters per second. He slowed down in 0.75 seconds.

[tex]\bullet \ v_f = 5 \ m/s \\\bullet \ v_i= 65 \ m/s \\\bullet \ t= 0.75 \ s[/tex]

Substitute the values into the formula.

[tex]a= \frac{ 5 \ m/s - 65 \ m/s}{0.75 \ s}[/tex]

Solve the numerator.

[tex]a= \frac{-60 \ m/s}{0.75 \ s}[/tex]

Divide.

[tex]a= -80 \ m/s^2[/tex]

The acceleration of the skydiver is -80 meters per second squared or 80 meters per second squared down. The skydiver is slowing down or decelerating, so the acceleration is negative or down.

Answer:

the quantum mechanical model VS. Neils Bohr of the atom

Explanation:

The Bohr model and quantum model are models that explain the structure of an atom. ... The key difference between Bohr and quantum model is that Bohr model states that electrons behave as particles whereas quantum model explains that the electron has both particle and wave behavior.

There are 15 sigma bonds in the molecule. These bonds are formed by overlap of atomic orbitals.

There are two kinds of bonds in organic chemistry, sigma bonds and pi bonds. Sigma bonds are formed by end to end or head to head overlap of atomic orbitals.

Pi bonds are formed by side by side overlap of atomic orbitals.

In the compound 4-methyl-pent-2-ene, there are 15 sigma bonds and only one pi bond.

Hence, in the compound  4-methyl-pent-2-ene, there are 15 sigma bonds.

For another definition of sigma and pi bonds see:

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Explanation:

why is because I never did this class

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Answer:

a. is released in the process

Explanation:

In fusion reaction the nucleus is unstable so it releases its binding energy resulting in decreasing its mass so it becomes more stable.

Peptide bonds are formed between carboxyl groups of one amino acid and amino group of another dehydration synthesis.

The correct answer is Five Peptide bonds

The peptide of "alanylglutamylalanylglycylalanylleucine" will have four or more peptide bonds.

It will also have free carboxyl groups.

The chain of amino acids is polypeptide.  

Usually C terminal amino acid is the residual at the end of peptide bonds formation.

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Spontaneous generation theory is that living organisms can arise by non living things.

This theory follows the concept of abiogenesis where there is non living parent for a living child.

The appearance of maggots from rotten meat is the idea of abiogenesis, this creates a living organism with a dead parent.

The rotten piece of meat is a non living object but still maggots were formed from this.

Therefore the correct answer is B.

Answer:

a

Explanation:

Answer:

As hydrogen is more electronegative than boron, in BH3 the oxidation number of hydrogen should be taken as -1. (E. N. of B = 2.0 & E. N. of H = 2.1)

Suppose, oxidation number of B is x.

So, we can write, x + 3*(-1) = 0

=> x = +3

Therefore, oxidation num

Explanation:

As hydrogen is more electronegative than boron, in BH3 the oxidation number of hydrogen should be taken as -1. (E. N. of B = 2.0 & E. N. of H = 2.1)

Suppose, oxidation number of B is x.

So, we can write, x + 3*(-1) = 0

=> x = +3

Therefore, oxidation num

hope it will help you

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hope it will helps

Answer:

3.72

Explanation:

First you need the volume.

Final level =             43.3

Initial level =            25.0

Change in volume =18.3

So the density = mass / volume

mass = 68.1

vol     = 18.3

density = 68.1 / 18.3

density = 3.72

Answer:

[tex]\boxed {\boxed {\sf 3.72 \ g/mL}}[/tex]

Explanation:

We are asked to find the density of a small object. Density is calculated using the following formula.

[tex]\rho= \frac{m}{v}[/tex]

The mass of the object is 68.1 grams.

The volume was found using water displacement. A known quantity of water was measured out (25.0 mL), then the object was added. The new water level was recorded (43.3 mL). The volume is the difference between the two water levels.

Now we know the mass and the volume, so we can substitute the values into the formula.

[tex]\rho= \frac{ 68.1 \ g }{18.3 \ mL}[/tex]

[tex]\rho = 3.721311475 \ g/mL[/tex]

The original measurements of mass and water levels have 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 1 in the thousandth place tells us to leave the 2 in the hundredth place.

[tex]\rho \approx 3.72 \ g/mL[/tex]

The density of the small object is approximately 3.72 grams per milliliter.