Pls help i will give crown

Answer:

Choice A: approximately \(0.12\; \rm M\).

Explanation:

Note that the unit of concentration, \(\rm M\), typically refers to moles per liter (that is: \(1\; \rm M = 1\; \rm mol\cdot L^{-1}\).)

On the other hand, the volume of the two solutions in this question are apparently given in \(\rm cm^3\), which is the same as \(\rm mL\) (that is: \(1\; \rm cm^{3} = 1\; \rm mL\).) Convert the unit of volume to liters:

Calculate the number of moles of \(\rm H_2SO_4\) formula units in that \(0.02\; \rm L\) of the \(0.09\; \rm M\) solution:

\(\begin{aligned}n(\mathrm{H_2SO_4}) &= c(\mathrm{H_2SO_4}) \cdot V(\mathrm{H_2SO_4})\\ &= 0.02 \; \rm L \times 0.09 \; \rm mol\cdot L^{-1} = 0.0018\; \rm mol \end{aligned}\).

Note that \(\rm H_2SO_4\) (sulfuric acid) is a diprotic acid. When one mole of \(\rm H_2SO_4\) completely dissolves in water, two moles of \(\rm H^{+}\) ions will be released.

On the other hand, \(\rm NaOH\) (sodium hydroxide) is a monoprotic base. When one mole of \(\rm NaOH\) formula units completely dissolve in water, only one mole of \(\rm OH^{-}\) ions will be released.

\(\rm H^{+}\) ions and \(\rm OH^{-}\) ions neutralize each other at a one-to-one ratio. Therefore, when one mole of the diprotic acid \(\rm H_2SO_4\) dissolves in water completely, it will take two moles of \(\rm OH^{-}\) to neutralize that two moles of \(\rm H^{+}\) produced. On the other hand, two moles formula units of the monoprotic base \(\rm NaOH\) will be required to produce that two moles of \(\rm OH^{-}\). Therefore, \(\rm NaOH\) and \(\rm H_2SO_4\) formula units would neutralize each other at a two-to-one ratio.

\(\rm H_2SO_4 + 2\; NaOH \to Na_2SO_4 + 2\; H_2O\).

\(\displaystyle \frac{n(\mathrm{NaOH})}{n(\mathrm{H_2SO_4})} = \frac{2}{1} = 2\).

Previous calculations show that \(0.0018\; \rm mol\) of \(\rm H_2SO_4\) was produced. Calculate the number of moles of \(\rm NaOH\) formula units required to neutralize that

\(\begin{aligned}n(\mathrm{NaOH}) &= \frac{n(\mathrm{NaOH})}{n(\mathrm{H_2SO_4})}\cdot n(\mathrm{H_2SO_4}) \\&= 2 \times 0.0018\; \rm mol = 0.0036\; \rm mol\end{aligned}\).

Calculate the concentration of a \(0.03\; \rm L\) solution that contains exactly \(0.0036\; \rm mol\) of \(\rm NaOH\) formula units:

\(\begin{aligned}c(\mathrm{NaOH}) &= \frac{n(\mathrm{NaOH})}{V(\mathrm{NaOH})} = \frac{0.0036\; \rm mol}{0.03\; \rm L} = 0.12\; \rm mol \cdot L^{-1}\end{aligned}\).

Re-extracting trimyristin with Hf in aqueous ethanol results in the production of carboxyl group and glycerol.

What is the ethanol used for?

When diluted, all alcoholic beverages—beer, wine, and spirits—contain ethanol. To stop skin infections, it is a topical component used in cosmetics, perfumes, and pharmaceutical preparations such rub complexes, lotions, tonics, and colognes.

Why does ethanol show up in gas?

Due to its higher octane number than gasoline, ethanol offers better mixing capabilities. Regulations requiring a minimum octane number in fuel avoid engine knocking and guarantee drivability. For environmental purposes, ethanol is less harmful than unblended petrol.

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At equilibrium, the ratio [NO2]/[N2O4] can be either less than, equal to, or greater than 1, depending on the specific reaction conditions.

At equilibrium, the ratio [NO2]/[N2O4] can be less than, equal to, or greater than 1, depending on the specific conditions of the reaction. The equilibrium constant (Kc) represents the ratio of the concentrations of products to reactants, in this case [NO2]^2/[N2O4].

1. If Kc > 1, then the ratio [NO2]/[N2O4] will be greater than 1, indicating that there is more NO2 than N2O4 at equilibrium.
2. If Kc = 1, then the ratio [NO2]/[N2O4] will be equal to 1, meaning that the concentrations of NO2 and N2O4 are equal at equilibrium.
3. If Kc < 1, then the ratio [NO2]/[N2O4] will be less than 1, which means there is more N2O4 than NO2 at equilibrium.

However, if the reaction is exothermic (releases heat), the equilibrium will favor the side with fewer moles of gas, which means that the ratio [NO2]/[N2O4] will be greater than 1.

The specific value of Kc depends on factors such as temperature and pressure, which can affect the position of the equilibrium.

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Answer: 12.0 moles

Explanation:

(omg, your in high school, but I'm in middle school but I have this same question lol.)

There would be an advantage for flowers that attract only one type of pollinator and excude others because the flower could be harmed by the pollinator. The flower could have a natural defense against certain species of animals to avoid things like getting completely eaten or getting a virus from an infected species. The disadvantage would be that some species that the flower needs might avoid the flower because of natural defense.

I hope this helps! Sorry if it doesn't because I'm only in middle school.    

If a plant has a specific pollinator, a good relationship evolves between the plant and the insect. If the plant becomes extinct, the plant also becomes extinct.

Pollination is the process by which pollen grains are transferred from the anther to the stigma of a flower. It is normally carried out by the agents of pollination such as wind, insects etc.

If a flower only has a specific pollinator, it is much easier for the plant to be pollinated because the pollinator evolves a good relationship with the plant.

However, if that specific pollinator happens to become extinct, that plant also becomes extinct because there will be no other pollinator for the plant specie.

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Answer:

calcium ca

Explanation:

We can see here that the only element that is on the same group (column) as Ba (Barium) is Calcium (Ca).

Answer:

The total number of atoms in this chemical formula

C8H3 NaBr 12

8+3+1+12=24

Answer:

it's volume also decrease

Answer:

97.5%

Explanation:

the US mint specifies pennies as 2.5% copper in 97.5% zinc

Answer:

I believe the answer is C.

Answer:

C

Explanation:

green house gases effects increases global warming

The answer is carboxyl group

The purpose of the wet paper towel in the Diels-Alder lab procedure is To encourage condensation during the reflux, preventing the reaction mixture from becoming too concentrated and potentially leading to the formation of unwanted side products option (B)

The purpose of the wet paper towel in the Diels-Alder lab procedure is to prevent the loss of solvent due to evaporation during the reflux process. The wet paper towel is placed on top of the round-bottom flask and acts as a cooling jacket.

As the solvent evaporates from the solution and condenses on the cool surface of the paper towel, it drips back down into the flask, preventing the solution from drying out. This helps maintain a constant volume and concentration of the reactants and ensures that the reaction proceeds as expected

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Answer:

To find the partial pressure of argon, we need to use the fact that the sum of the partial pressures of all the gases in the mixture is equal to the total pressure:

partial pressure of argon + partial pressure of oxygen + partial pressure of nitrogen = total pressure

Let's rearrange this equation to solve for the partial pressure of argon:

partial pressure of argon = total pressure - partial pressure of oxygen - partial pressure of nitrogen

Substituting the given values, we get:

partial pressure of argon = 3.75 atm - 0.75 atm - 1.80 atm

partial pressure of argon = 1.20 atm

Therefore, the partial pressure of argon in the mixture is 1.20 atm.

Explanation:

Answer: 1.20 atm

Explanation:

partial pressure of argon = 3.75 atm - 0.75 atm - 1.80 atm

partial pressure of argon = 1.20 atm

Therefore, the partial pressure of argon in the mixture is 1.20 atm

Answer:

sediments consist of rocks and minerals, as well as the remains of plants and animals

Explanation:

Answer:

2NaOH + CO2 -----> Na2CO3 + H2O

Explanation:

Carbon dioxide is acid anhydride, so reacts like and acid with Sodium hydroxide is neutralisation reaction to form salt and water

Answer:

the awnser is A

Explanation:

the awnser is A

Answer:

A

Explanation:

Answer:

4.14516129 g/mL

Explanation:

The density can be found with the following formula.

\(d= \frac{m}{v}\)

where \(m\) is the mass and \(v\) is the volume.

We know the mass is 25.7 grams. We must find the volume.

The volume is equal to the volume of water that is displaced. Subtract the initial volume from the final volume.

⇒ final volume - initial volume

The initial volume is 35.5 mL and the final volume is 41.7 mL.

⇒ 41.7 mL - 35.5 mL

⇒ 6.2 mL

The volume of the aluminum piece is 6.2 mL.

Now we know the mass and the volume.

\(m= 25.7 g\\v=6.2 mL\)

Substitute the values into the formula.

\(d=\frac{m}{v}\)

\(d=\frac{25.7 g}{6.2 mL}\)

\(d=4.14516129 g/mL\)

The density of the aluminum sample is 4.14516129 g/mL

Answer:

The volume is 20.3

Explanation:

Mendeleev's periodic table allows us to predict the chemical properties of elements and their compounds. Let's start with oxides of carbon, which are compounds of carbon and oxygen.

Carbon can form two common oxides: carbon monoxide (CO) and carbon dioxide (CO2). In carbon monoxide, there is one carbon atom and one oxygen atom, so the formula would be written as CO with a subscript of 1 for carbon and a subscript of 1 for oxygen. In carbon dioxide, there is one carbon atom and two oxygen atoms, so the formula would be written as CO2 with a subscript of 1 for carbon and a subscript of 2 for oxygen.

Moving on to aluminum, it also forms oxides. The most common oxide of aluminum is aluminum oxide (Al2O3). In this compound, there are two aluminum atoms and three oxygen atoms. So the formula would be written as Al2O3 with a subscript of 2 for aluminum and a subscript of 3 for oxygen.
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As stated in the preceding statement Square pyramidal geometry describes the molecules.

An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.

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Answer:

it is because a number of factors, including sample surface cleanliness and temperature, can prevent chunks of alkali metals from exploding on contact with water. The team eliminated those variables and others by using a sodium-potassium alloy that remains liquid at room temperature and a droplet delivery system featuring a calibrated syringe.

Answer: Potassium has a chloride mixture which makes it so sodium interacts easily with it to form the bond

Answer:

Reflection: you look in the mirror. Refraction: You put a straw in a glass of water, and it looks like it broke. Absorption: If you have a black sweater and you wear it out in the cold, the black sweater is going to hold in heat better than a lighter sweater because the black sweater absorbs light .

Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.

Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.

The balanced reaction can be given as:

\(\rm 2Mg + O_{2} \rightarrow 2MgO\)

From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.

If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.

The mass of oxygen can be calculated as:

\(\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}\)

Therefore, option B. 64 gm of oxygen are required.

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The common intermediate formed during the synthesis of imines and enamines, when carbonyl compounds react with primary and secondary amines is an intermediate called: an aza-enolate.

This is an anion that is formed from a reaction between a carbonyl compound and an amine, and is essential for the formation of both imines and enamines. A carbonyl compound, such as an aldehyde or a ketone, will react with a primary amine to form an imine, and a secondary amine to form an enamine.

The aza-enolate intermediate is formed through nucleophilic addition of the amine to the carbonyl group, followed by protonation of the anion. The aza-enolate intermediate can be stabilized by adjacent electron-withdrawing groups such as an amide or ester, which will cause the enolate to become planar and more stable.

The aza-enolate intermediate can then be converted into either an imine or enamine through an elimination reaction or an SN2 displacement reaction.

In summary, the common intermediate formed during the synthesis of imines and enamines, when carbonyl compounds react with primary and secondary amines is an intermediate called an 'aza-enolate'. It is formed through a nucleophilic addition of the amine to the carbonyl group, followed by protonation of the anion. This intermediate can then be converted into either an imine or enamine.

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In this question, we have two compounds, ClF and LiCl. The first molecule is a covalent compound, since we will not have donation of electrons but instead the sharing of electrons, but in this case, the difference of the electronegativity will cause this molecule to have Polar covalent bond, which will cause partial charges to occur. LiCl is a molecule in which we have a greater difference in electronegativity, which makes this molecule be an ionic molecule, and not covalent. Since ionic compounds have real charges, the only possible answer will be ClF, since they have partial charges. Letter B