HELP !!! urgent
which one is oxidized ?
lead (II) oxide + carbon monoxide= lead + carbon dioxide

ANSWER

The number of moles of the gas is 2.2 moles

EXPLANATION

Given thanks

The volume of the gas is 48.4L

To find the number of moles, follow the steps below

Recall, that 1 mole is equivalent to 22.4L/mol

Let x represents the number of moles of the gas

Hence, the number of moles of the gas is 2.2moles

Answer:

Since all of them are aqueous solutions, the solvent in each solution is H2O. Based on the Raoult's Law, we only have to determine which solution contains the highest mole fraction of the solvent, H2O. The solution that will have the lowest vapor pressure is a. 0.20 m Na2SO4.

Explanation:

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The partial pressure of the hydrogen gas collected in this way is 710 mmHg. When collecting a gas over water, the total pressure of the system includes the vapor pressure of water at that temperature

When collecting a gas over water, the total pressure of the system is the sum of the partial pressure of the gas and the vapor pressure of water at that temperature. In this case, the total pressure is given as 742 mmHg, and the vapor pressure of water at 30°C is 31.8 mmHg.

To find the partial pressure of the hydrogen gas, we need to subtract the vapor pressure of water from the total pressure. Therefore, the partial pressure of the hydrogen gas can be calculated as:

Partial pressure of hydrogen gas = Total pressure - Vapor pressure of water

Partial pressure of hydrogen gas = 742 mmHg - 31.8 mmHg

Partial pressure of hydrogen gas = 710 mmHg

In this chemical reaction, the collected hydrogen gas exerts a partial pressure of 710 mmHg.

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Answer:

4is the answer

Explanation:

Given what we know, we can confirm that a general (all-inclusive) term for organic molecules that have the same molecular formula, but that differ in their structure or in the spatial arrangement of their atoms is isomers.

Therefore, we can confirm that the general (all-inclusive) term for organic molecules that have the same molecular formula, but that differ in their structure or in the spatial arrangement of their atoms is isomers.

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The concentration of the HCl solution is 0.7484 M.

To calculate the concentration of the HCl solution, we can use the concept of stoichiometry.

According to the balanced chemical equation for the reaction between NaOH and HCl, one mole of NaOH reacts with one mole of HCl.

First, we need to determine the number of moles of NaOH used.

By multiplying the volume (95.3 mL) by the concentration (0.194 M)

We find that the moles of NaOH used are:

moles of NaOH = (0.194 M) * (0.0953 L)

                           = 0.01871 moles

Since the reaction is 1:1, the moles of HCl present in the 25.0 mL solution can be determined as:

moles of HCl = 0.01871 moles

Finally, we can calculate the concentration of the HCl solution by dividing the moles of HCl by the volume in liters:

concentration of HCl = (0.01871 moles) / (0.0250 L)

                                    = 0.7484 M

Therefore, the concentration of the HCl solution is 0.7484 M.

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Answer:

C. newton's third law of motion

Explanation:

as newton's third law of motion states that every action has a reaction that is equal in size, opposite in direction, and acts simultaneously.

Answer:

D :)

Explanation:

Cells die and the new cells that are being produced are replaced by new living cells. (If cell division prevented cancer, we'd all be saved by now.)

Cell division is carried to produce new identical cells to during reproduction as well to replace old and diseased cells.  Thus option C is correct.

Cell division is the process of multiplication of a cell into two identical daughter cells. Cell division is taking place in all living organism by which they reproduce and repair cells.

Cell division takes places through several stages namely,  interphase, telophase etc. There are different methods of cell division such as mitosis, meiosis, binary fission etc.

Different level of organisms follows different methods for cell division. In eukaryotes, mitosis takes place where genetically identical daughter cells are produced. It is called vegetative division.

In reproductive cell division the number of chromosomes will be reduced in daughter cell to half or that in parent cells. Thus in a cell cycle , the odl cells are replaced by new cells and identical offsprings are created by cell division. Hence, option C is correct.

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The reagent that readily reacts with bromobenzene without heating is: sodium cyanide (NaCN)/DMSO.

Sodium cyanide (NaCN) in DMSO readily reacts with bromobenzene (C6H5Br) to produce benzonitrile (C6H5CN) and NaBr. DMSO is a solvent that can dissolve both organic and inorganic compounds, making it an ideal choice for the reaction.
NaCN + C6H5Br → C6H5CN + NaBr

The other reagents mentioned in the question may react with bromobenzene but require heating to initiate the reaction. Sodium ethoxide (NaOCH2CH3), for example, can react with bromobenzene to form phenylethene, but heating is required.

Sodium amide (NaNH2) in liquid ammonia (NH3) is a strong base that can deprotonate bromobenzene to form phenylsodium. However, heat is required to initiate this reaction. N,N-dimethylaniline ((CH3)2NH) is an organic base that may react with bromobenzene, but it is unlikely to produce a significant yield.

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If you use the molecular orbital theory, option C, which is the paramagnetism of oxygen particles, you can explain the odd thing that Lewis structures can't explain.

The fact that oxygen particles are paramagnetic doesn't make sense in terms of Lewis structure. Since oxygen atoms have two electrons that don't have a partner, only molecular orbital theory can explain why oxygen particles are paramagnets. A Lewis structure is a much better way to show how the electrons in a particle's valence shell are arranged. It is used to show how the electrons around the different atoms in a particle are arranged. Electrons are shown as "dabs" or as a line running between two particles. In his cubical particle hypothesis, Lewis came up with the "octet rule." The octet rule is based on the fact that iotas tend to like having eight electrons in their valence shell. When molecules have fewer than eight electrons, they usually react by making more stable mixtures. Atoms will act to get into the most stable state possible.

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In the titration of a 25.6 ml sample of a 0.397 m aqueous hydrofluoric acid solution with a 0.406 m aqueous potassium hydroxide solution, the pH at the equivalence point is 8.21.

Given volume of sample (V) = 25.6ml = 0.0256L

Concentration of  aqueous hydrofluoric acid solution (M1) = 0.397M

Concentration of  aqueous potassium hydroxide solution (M2) = 0.406M

The concentration of fluoride ions will determine the pH at the equivalency point. During the titration, the reaction is

HF + KOH --> H2O + KF.

Since it is the conjugate base of a weak acid, the F- will have an impact on the pH of the solution rather than the K+ in solution.

F- + H2O <--> HF + OH- is the reaction at the equivalence point, and the fluoride ion's molarity is 0.0256 x 0.397 = 0.010 moles of HF = moles of KOH at the equivalence point = 0.010/0.406 = 0.0246L of KOH

At the equivalence point, the F-'s molarity will be equal to =  0.010/(0.0256+0.0246) = 0.199M

Additionally, the Kb for F- is required, and its values are as follows:

Kw/Ka = 1.0 x 10-14 / (6.6 x 10-4) = 1.5 x 10-11

pOH = -log (1.8 x 10-6) = 5.79

pH = 14-5.79 = 8.21

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Answer:

The nucleus

Explanation:

Answer:

chlorine dioxide is empirical formula for CLO2.

Answer:

Due to presence of a triple bond between the two N−atoms, the bond dissociation enthalpy (941.4 kJ mol  

−1

) is very high. Hence, N  

2

​

 is the least reactive.

E°cell for each reaction, and rank the strengths of the oxidizing and reducing agents:

Complete the given reaction

\($$\mathrm{N}_{2} \mathrm{O}(g)+2 \mathrm{H}^{+}(a q)+2 \mathrm{Au}(s) \longrightarrow \mathrm{N}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(l)+2 \mathrm{Au}^{+}(a q)$$\)

Write the oxidation reaction

\($$\mathrm{Au}(s) \longrightarrow \mathrm{Au}^{+}(a q)+e^{-}$$\)

\($$E_{a c d}=-1.69 \mathrm{~V}$$\)

Write the reduction reaction

\($$3 \mathrm{~N}_{2} \mathrm{O}(g)+2 \mathrm{H}^{+}(a q)+2 \mathrm{e}^{-} \longrightarrow \mathrm{N}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(l) \quad E_{r e d}=+1.77 \mathrm{~V}$$\)

Calculate the standard cell voltage

\($$E_{c ell}=E_{r e d}+E_{o x d}$$\)

Substitute the value

\($$\begin{aligned}&E_{c e l l}=1.77-1.69 \\&E_{c e l l}=0.08 \mathrm{~V}\end{aligned}$$\)

Hence the standard cell potential is \($0.08 \mathrm{~V}$\)

Oxidizing agent in this reaction is

\($$\mathrm{N}_{2}(g), \mathrm{N}_{2} \mathrm{O}(g)$$\)

Reducing agent in this reaction is

\($$\mathrm{Au}^{+}(a q), \mathrm{Au}(s)$$\)

The potential difference between the two electrodes of an electrochemical cell, which develops when electrons are sent via the external circuit of a cell that has not reached equilibrium, is known as the cell potential.

A chemical process known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances. Any chemical reaction in which the oxidation number of a molecule, atom, or ion changes due to the gain or loss of an electron is referred to as an oxidation-reduction reaction.

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Answer:

Dark matter slows down the expansion of the universe, while dark energy speeds it up

Explanation:

Answer:

A fatty acid is made of a polar carboxylic acid functional group and a nonpolar hydrocarbon tail.

Explanation:

A fatty acid is made of fat-soluble components, that consists of a large (more than 4 carbon atoms) aliphatic chain of carbon atoms, with hydrogen atoms and a carboxyl group (-COOH). The named fatty acid is because of the -COOH group.

The chain can be made of carbon atoms with a single bond, (saturated) or with double or triple bonds (unsaturated). When the fatty acid has just one double bond the fatty acid is monounsaturated, and otherwise, if it has multiple double bonds it is polyunsaturated. Fatty acid chains can be different in their lengths and their degree of unsaturation.          

Mostly of the tail of the fatty acid is nonpolar and hence, hydrophobic, because the long-chain made of hydrocarbon atoms.

From all of the above, the correct answer is option b: A fatty acid is made of a polar carboxylic acid functional group and a nonpolar hydrocarbon tail.

I hope it helps you!

Answer:

An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.

The total pressure in the container after the three gases are mixed is 6 atm and the partial pressure of He is 1 atm.

According to Dalton's Law of Partial Pressure , the pressure exerted by a mixture of gas is equal to the sum of the partial pressure of the gases in the mixture.

P(total) = p₁ +p₂+p₃+.....

As the volume of the containers are same and the

n = 1*5/RT for Helium

n = 2*5 /RT for Neon

n= 3*5/RT for Argon

Mole fraction = moles of the element/Total moles

Moles fraction of Helium is

\(\rm \dfrac{1*5}{1*5+2*5+3*5}\)

= 1/6

Total Pressure in the container = 1 + 2 +3 = 6 atm

The partial pressure of Helium will be

=Mole fraction * Total pressure

=(1/6)*6 atm

= 1 atm , as the volume is same the temperature is same , the pressure will also be same.

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Answer:

d i took the test

Explanation:

Methanol and isopropyl alcohol are types of alcohol that are highly toxic and can cause death.

Methanol is extremely poisonous, and oral, pulmonary, and/or cutaneous exposures can result in serious systemic poisoning and even mortality. Because alcohol-based hand rubs typically contain ethanol, isopropyl alcohol, n-propyl alcohol, or mixtures of these alcohols, methanol must never be added to them.
It's critical to distinguish between isopropyl alcohol and methanol and ethylene glycol, which pose greater gastrointestinal risks. Although it increases the osmol gap, isopropyl alcohol does not raise anion gap acidosis, retinal toxicity (as methanol does), or kidney failure (as ethylene glycol does).
Since isopropanol is mainly metabolised to acetone, it usually causes less clinically serious effects when consumed than ethylene glycol or methanol.
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Answer:

\(M_{acid}=3.57M\)

Explanation:

Hello there!

In this case, since this acid-base neutralization is performed in a 1:2 mole ratio of acid to base as the former is a diprotic acid (two hydrogen ions in the molecule), we can write the following equation:

\(2M_{acid}V_{acid}=M_{base}V_{base}\)

In such a way, we can solve for the molarity of the acid, given the molarity and concentration of the NaOH base and the volume of the acid:

\(M_{acid}=\frac{M_{base}V_{base}}{2V_{acid}}\)

Thus, we plug in the given data to obtain:

\(M_{acid}=\frac{38.70cm^3*1.90M}{2(10.30cm^3)} \\\\M_{acid}=3.57M\)

Best regards!

The method used to obtain colored light from a filament lamp is additive. A filament lamp is a device that emits white light when it's turned on. However, the light can be made to appear colored by using a technique called additive color mixing. In this method, colored filters are used to filter the white light emitted by the filament lamp. The colored filters absorb some of the light wavelengths and allow others to pass through. When different colored filters are used, the colors of the light that passes through them combine to produce a new color. This method is called additive because the colors of light are added together to produce a new color.

The correct option is A. additive.

What percentage of the Earth's surface is covered by oceans?

71 percentage

What percentage of the Earth's surface is covered by oceans?

71 percent/%

Answer:

a)

Hmax=v2sin⁡2452g+hH_{max}=\frac{v^2\sin^2{45}}{2g}+hHmax​=2gv2sin245​+h

Hmax=2+62sin⁡2452(9.81)=2.92 mH_{max}=2+\frac{6^2\sin^2{45}}{2(9.81)}=2.92\ mHmax​=2+2(9.81)62sin245​=2.92 m

It is less than the height of the basket of 3.05 m. So, this is a miss.

b)

d=R=v2sin⁡(2⋅45)g=v2gd=R=\frac{v^2\sin{(2\cdot45)}}{g}=\frac{v^2}{g}d=R=gv2sin(2⋅45)​=gv2​

4.21=v29.814.21=\frac{v^2}{9.81}4.21=9.81v2​

v=6.43msv=6.43\frac{m}{s}v=6.43sm​

Answer:

C, Truck B will have a greater stopping distance. Took the test got it right.

Explanation:

Answer:

the answer is c

Explanation: the truck with less kg means that it will be more likely to stop fast but if you have a high kg it will slide till it stops thus the answer is c

Answer:

This is an example of chemical change because the Kool aid dissolved and turned the water red