The figure below shows the rotation curves of several spiral galaxies, extending to the very edge of their visible disks. What do these curves tell us about the distribution of dark matter in these galaxies?



Group of answer choices

Most of the dark matter is in the bulge.

Most of the dark matter is in the galaxies’ outskirts.

Most of the dark matter is near stars.

Most of the dark matter is in clumps.

Answer:

There can be numerous derived quantities all branching from the basic 7 base quantities.

Explanation:

The  derived SI units are

m/s² that is of acceleration that is rate of change of velocity

m/s is the SI unit of velocity that is rate of change of displacement

Nm is the SI unit of Torque i.e T= rxF

and so on

The propane nitrile react with the Grignard reagent in the presence of the diethyl ether the product form is called as the ethyl phenyl ketone.

The reaction in between the propane nitrile and the Grignard reagent is given as follows :

                                                   diethyl ether

CH₃ - CH₂ - C ≡ N  +  ph - MgBr  ---------->   CH₃ - CH₂ - C - ph

propane nitrile                                                                   ||

                                                                                          O

                                                                      ethyl phenyl ketone

The Grignard reagent is a type of the organometallic compound. the general formula for the grignard reagent is R - X. the very common use of grignard reagent is the in the organic synthesis.

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 We require the conjugate base of an acid if we have one, and vice versa. If the required species is an ion. NaC2H2O2F is one alternative for the fluoroacetate ion, C2H2O2F-, which we need as a soluble molecule.

The solution can act as a buffer because it contains sizable amounts of both the conjugate base, F-, and the conjugate acid, HF. The titration curve of a buffer solution shows this buffering activity.

The solution of reserve acidity or alkalinity that resists pH change upon the addition of a modest amount of acid or alkali is known as a buffer. A steady pH is necessary for the majority of chemical processes. Numerous pH regulating systems in nature employ buffering.

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The combination of ortho and para produces a resonance structure that stabilises the arenium ion. As a result, ortho and para products form faster than meta. Because of steric effects, the para product is generally preferred.

In ortho-substitution, two substitutions occupy adjacent positions, that can be numbered 1 and 2. These positions are branded R and ortho in the diagram. The substituents in morpho occupy positions 1 and 3.The ultimate predictor of whether a methyl group is ortho-, para-, or meta-directing is its ability to stabilise an adjacent carbocation. Substituents with a covalent bond on the atom adjacent to a aromatic ring are ortho- and para- executives since they can form a new pi-bond with an adjoining carbocation. For electrophilic substitution, electron donating groups in an aromatic ring are made reference to as ortho/para groups.

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The three types of alternative splicing patterns with the correct description of how they lead to the production of different protein isoforms are: letters A, C and E.

These three options are correct because they accurately describe the different types of alternative splicing patterns and the ways in which they lead to the production of different protein isoforms. Alternative splice sites and mutually exclusive exons allow for the inclusion or exclusion of certain sequences, leading to proteins with different sequences.

Alternative splice sites within an exon allow for the presence of different domains in the protein, while Mutually exclusive exons allow for the generation of proteins with different sequences.

Cassette exons allow for the exclusion of entire protein domains. Alternative polyadenylation produces messages with different 3' coding sequences and 3' untranslated regions, which can be important in regulatory events.

Complete question:

Choose the types of alternative splicing patterns with the correct description of how they lead to the production of different protein isoforms Select the three correct statements:

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There are several methods that can be used to separate zinc from brass. One method is to use a chemical process called solvent extraction, which involves dissolving the brass in a chemical solvent that will selectively extract the zinc. Another method is to use electroplating, which involves using an electric current to coat the brass with a layer of pure zinc. Once the zinc has been separated from the brass, it can be recovered by heating the brass to a high temperature, causing the zinc to vaporize and be collected.

Answer:

A. Ca, Ba, Be, Sr

The stationary phase, which is the part of chromatography that doesn't move and is typically a solid a liquid supported on the a solid, is the component whose high solubility inside the liquid phase results in a high retention period.

Along with a stationary phase of polar paper, the solvent functions as the mobile phase.Nonpolar chemicals will interact with the solvent and move more swiftly,while polar compounds will move more slowly and interact with the paper.

The stationary phase and green dye A have the strongest affinities.Because it has traveled a shorter distance from the source, it adsorbes to a stationary phase at a faster rate.

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If a compound that contains the elements by mass: Mo = 43.95%, O = 7.33%, Cl = 48.72% then the empirical formula will be Cl3MoO

The molar mass of Cl=35.453,

Molar mass of Mo=95.94,

Molar mass of O=15.9994

Converting these  to moles: Cl=1.3742137477787, Mo=0.45809881175735, O=0.45814218033176

Here the smallest mole value is 0.45809881175735

Now we have to divide all components by the smallest value: Cl=2.9998194985641, Mo=1, O=1.0000946707856

If we don't consider the fractional values the closest round of values will be: Cl=3, Mo=1, O=1

So the formula becomes Cl3MoO

Therefore the required empirical formula is Cl3MoO

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The Second Law of Thermodynamics states that thermal energy can only be transferred from a cooler location to a warmer location when work is done.

This means that energy cannot spontaneously move from a cold body to a hot body; rather, energy must be input into the colder body in order to move it to the warmer body.

This is because thermal energy always flows from high temperature to low temperature, rather than the other way around. The work done must be greater than the thermal energy being transferred, so that the thermal energy can be transferred from cold to hot.

This is because energy is always conserved, so any energy that is gained from the transfer must be greater than the energy that was put in.

The Second Law of Thermodynamics is essential in understanding the behavior of many physical processes, such as the flow of heat and the efficiency of engines.

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During silica gel chromatography, it is normal for: more polar compounds more polar compounds to elute more slowly than less polar compounds

It is a method in which a liquid serves as the mobile phase while the stationary phase is made up of solid adsorbents like silica gel and activated alumina powder. The adsorbents' activity and the solvent's polarity affect the active compound separation principle. A good separation of the compound occurs when the solvent's polarity is very low and the adsorbent's activity is strong and high. The outcomes of compound separation, on the other hand, are poor if the solvent's polarity is very strong and the activity of the adsorbents is high. It implies that chemical isolation and purification are not entirely pure.

The method of column chromatography is the most well-known and widely used method for separating complex mixtures that are packed in a column.

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Answer:

2.59 x 10^22 molecules

Explanation:

According to Avogadro's number, 1 mole of HCl has 6.022 x 10^23 molecules.

so 0.043 x (6.022 x 10^23)/1 = 2.59 x 10^22 molecules

This question is generating exothermic reactions. An exothermic reaction is the process through which energy is released when bonds are broken

Given that it produces heat and is explosive in nature, the chemical reaction indicated in this question is an exothermic reaction.

Exothermic processes can, in fact, produce both heat and light. The total energy of the reactants is greater than the total energy of the products in such reactions. An endothermic reaction is one that uses energy to break bonds and stores that energy in the bonds that are created during the reaction. An exothermic reaction is the process through which energy is released when bonds are broken. For instance, combustion is an exothermic reaction that first produces heat, carbon dioxide, and water from the reaction of oxygen, wax, and energy input.

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The option (a)- is correct and it is impossible for the reaction .

What is reaction?

One or more chemicals, referred to as reactants, are changed into one or more new compounds, referred to as products, during a chemical reaction. Substances are composed of chemical elements or compounds.

What is compounds ?

When two or more elements combine chemically in a certain mass ratio, compounds are produced. Compounds are created when two or more different types of elements are mixed in a particular ratio of their atoms.

Therefore , the option (a)- is correct and it is impossible for the reaction .

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The combustion reaction is to rate the Stoichiometric coefficient.

What is combustion ?

Combustion is a chemical reaction that often involves the presence of oxygen and produces heat and light in the form of flames.

What is Stoichiometric coefficient ?

To maintain an even distribution of each element on the reactant and product sides of the equation, the stoichiometric coefficient is the number placed in front of atoms, ions, and molecules in a chemical process. Despite the fact that the stoichiometric coefficients might be fractions, whole numbers are routinely employed and frequently preferable.

CH4(g)+2O2(g)→CO2(g)+2H2O(g)

(1,2,1,2) are the coefficients that are needed to balance the equation for the combustion of methane.

Therefore, the combustion reaction is to rate the Stoichiometric coefficient.

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Answer:Sodium(Na)

Explanation: According to electronic configuration of sodium, the outer shell has 1 unpaired electron. So, It will react with halogen elements (group 17) to form NaX. Where X is halogen element and ratio is maintained that is 1:1.

You will need to critical the moles of O2 from its mass and molar mass, then calculate the moles of C2H6 that can be created using stoichiometry.

First Calculate moles of O2.

n = m/M

n = moles = ? mol O2

m = mass(g) = 154 g O2

M = molar mass(g/mol) = (2×15.999 g/mol O) = 31.998 g O2/mol O2

n = m/M = g/g/mol = g × mol/g

n O2 = 154 g O2 × 1mol O2/31.998 g O2 = 4.34 mol O2

The balanced equation is:

2C2H6 + 7O2 → 4CO2 + 6H2O

By using stoichiometry to calculate the moles of C2H6.

Multiply the 4.34 moles of O2 by the mole ratio between O2 and C2H6 in the balanced equation, such that moles of O2 cancel and leave moles C2H6.

4.34 mol O2 × 2 mol C2H6/7 mol O2 = 0.556 mol C2H6 rounded up to three significant figures

1.25 mole of ethane will be required to react with 4.34 g of oxygen gas.

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Political parties are most inclined to match polling responses to identifiable individuals in voter files to determine patterns in national general election campaigns today.

Political parties are essential institutions of democracy. By competing in elections parties offer citizens a choice in governance, and while in opposition they can hold governments accountable. When citizens join political parties, volunteer their time, donate money and vote for their leaders, they are exercising their basic democratic rights.

In an election campaign winning is everything, there is no consolation for being a runner-up. With the increasing penetration of television and the internet, voters today are more informed, independent, and discerning in casting their votes.

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n addition to these noncatalytic effects, many instances have shown that water can function as a reactant and even a cocatalyst in heterogeneous catalytic reactions, enhancing reaction rates and product selectivity.

Who or what is water's catalyst?

Platinum is by far the finest catalyst for severing water molecules to form hydrogen gas, according to scientists. According to a recent study by scientists at Brown University, the reason platinum is so effective is not what was previously thought.

A catalyzed process is what?

According to definitions, catalysis is the process by which the addition of a material (the catalyst) that is not itself modified during the chemical reaction changes the pace of chemical reactions (ACS, 1996).

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The NCl₃ is liquid at room temperature but NH₃ is gas at room temperature because NH₃ has the intermolecular hydrogen bonding , it hold thew ammonia very tightly.

The NCl₃ is liquid at room temperature but NH₃ is gas at room temperature because NH₃ has the intermolecular hydrogen bonding , it hold thew ammonia very tightly. the van der waal force is the weak force ads compared to the hydrogen bonding.  NCl₃ partly dissociates to form ions and nh3nh3 does not. therefore, ion-dipole interactions are present in NCl₃ but not in NH₃

Thus, NH₃ is the gas at the room temperature and the NCl₃ is liquid at room temperature.

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Common to all cell : Plasma membrane , Ribosome ,DNA

Unique to Eukaryotic cell : Nucleus , Rough endoplasmic , reticulum Mitochondrion.

A membrane-bound building block that contains the basic molecules of life and from which all living things are made. A single cell is often a complete organism in its own right, such as a bacterium or yeast. Other cells acquire specialized functions as they mature. These cells cooperate with other specialized cells to become the building blocks of large multicellular organisms such as humans and other animals. Cells are much larger than atoms, but they are still very small. The smallest known cells are a group of tiny bacteria called mycoplasma.

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the proper hydrogen atoms, CH 16 q 3. The organism and the presence or lack of oxygen determine metabolism.

Ectomorph, muscle mass, and endomorph are the three basic metabolic types. These are phrases you generally won't hear in your typical, everyday talks. However, understanding the body types you are born with will benefit your exercise program over time.

The chemical processes that occur inside the body's cells during metabolism convert food into energy. Our bodies need this energy for all of their functions, including movement, thought, and growth.. The chemical processes of metabolism are regulated by various proteins in the body.

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Given reaction H2 + F2 → 2 HF is a Synthesis reaction.

Synthesis reactions are those that take place when two distinct atoms or molecules interact to create a new chemical or molecule. When a synthesis reaction takes place, energy is often released, and the reaction is exothermic. An endothermic result, however, is also conceivable.

Because several reactants combine to generate a single product, synthesis reactions are also known as combination reactions.

Bonds between two substances are formed during synthesis reactions. As a result, you might want to think about synthesis reactions as processes that help your body create things. Because of this, we can see that synthesis reactions are crucial for both body growth and tissue healing.

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Acetone enolate preferentially attack the benzaldehyde rather than another acetone molecule because it is a strong nucleophile which will attack the carbonyl of benzaldehyde and forms a B- carbonyl alkoxide ion.

Benzalacetone is the end product of the aldol condensation reaction between acetone and benzaldehyde. Acetone may be deprotonated to produce a nucleophilic enolate anion since it contains -hydrogens (on both sides). Because it is significantly more electrophilic than a ketone, the aldehyde carbonyl interacts with the enolate quickly. Since it dehydrates spontaneously under the reaction conditions, the original aldol adduct cannot be separated. However, the resulting, - α, β-unsaturated  ketone contains active hydrogen that can condense with additional benzaldehyde molecules.

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The degree of unsaturation of the compound is 3.

When we talk about the degree of unsaturation, we are referring to the number of the hydrogen atoms that could not be found in the system. We know that when a saturated compound is formed, there is the loss of some of the hydrogen atoms from the molecular formula.

The term unsaturated in itself means that the compound do not have the exact number of the hydrogen atoms or the hydrogen atom compliment that it should normally have.

This would happen as the multiple bonds are formed then a given number of the hydrogen atoms would be lost from the system so that the multiple bond can now be formed in the compound that we are looking at. The more the number of the multiple bonds, the more the degree of unsaturation of the molecule.

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plot(density(x),col = "blue") #As we can see the distribution is fairly Normal

q q line(x, col = "blue") #In Q Q P Lot the straight blue line should pass through maximum number of point at 45 degree (x, col = "blue", freq = FALSE)

lines(density(x), col = "red", lwd = 2) #We can also check distribution of Normal by Histrogram and superimpose red line

ad .test(x) #Anderson Darling test gives p value 0.1424 that mean there is 14.24 percent chance that his data is coming from Normal

t(x) Cramer-von Mises test gives p value 0.2147 that mean there is 21.47 percent chance that his data is coming from Normal

Llliefors (Kolmogorov-Smirnov) test gives p value 0.2355 that mean there is 23.55 percent chance that his data is coming from Normal

Pearson chi-square test gives p value 0.7301 that mean there is 73.01 percent chance that his data is coming from Normal

Shapiro- Francia test gives p value 0.03482 that mean there is 3.48 percent chance that his data is coming from Normal

Shapiro-Wilks test gives p value 0.07154 that mean there is 7.15 percent chance that his data is coming from Normal

#If p-value <= Alpha(=0.05) reject null hypothesis(i.e sample points comes from Normal Population) but we take Shapiro-Wilks test into account because it is distribution free and regarded as best test for Normality hence we accept the null hypothesis and conclude that the sample comes from Normal Distribution but it is not very much likely.

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A weak acid or base and the salt of that weak acid or base make up a buffer. Three combinations can be used to create buffers: (1) H 3PO4 and H 2PO4; (2) H 2PO4 and HPO 4 2; and (3) HPO 4 2 and PO 4 3.

Equivalent quantities of an acid and its conjugate base are found in the most efficient buffers. An added base or an added acid can be neutralized by a buffer that has roughly equal concentrations of a weak acid and its conjugate base in solution.

Strong acid hydrochloric acid (HCl) and its conjugate base, chloride sodium chloride provides an anion (NaCl). Due to the fact that we are combining a potent acid with its incredibly weak conjugate base, this will not result in a buffer solution.

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Answer:

41

Explanation:

The statement saying the standard reduction potentials for fluorine gas to the fluoride ion and the aluminum (iii) ion to aluminum metal are 2.866 v and -1.662 v, respectively is true.

The standard reduction potential of a species is defined as the measure of the ability of that species to get reduced during a redox reaction.

The value of the standard reduction potential are pre decided for each and every element.

The value of the standard reduction potential for fluorine gas to the fluoride ion is +2.866 V.

The value of the standard reduction potential the aluminum (iii) ion to aluminum metal is -1.662V.

Both of these values are stated correctly in the given question. So, the given statement is true.

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