A chemist uses 0.25 l of 2.00 m h2so4 to completely neutralize a 2.00 l of solution of naoh. the balanced chemical equation of the reaction is given below. 2naoh h2so4 right arrow. na2so4 2h2o what is the concentration of naoh that is used?

Answer:

shows how anything like each thing is composed of for instance see how water is made of: hydrogen and oxygen which makes it a compound

The elements are the basic things by which everything in the world is build up. Different elements combine to form compounds. There are various kinds of inorganic and organic compounds around us that create the matter.

Elements are the basic things of any substance in the world. There are 118 known elements which can be found in the modern periodic table. These elements include metals, gases, and semi metals.

Atoms of same elements forms molecules. Atoms of different elements combines to form the compounds. There are various types of compounds such as ionic compounds, covalent compounds, coordination complex etc.

Water is a compound formed from the elements hydrogen and oxygen. The table salt we use every day is a compound, sodium chloride. Similarly we can find there are many compounds that we use everyday are creating the matter in the world.

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Answer:

C. Nylon

Explanation:

Nylon is a synthetic fiber, strong, elastic, and holds excellent abrasion resistance. Therefore it is used for making parachutes and ropes for rock climbing.

Answer:

Nylon

Explanation:

The single most important factor influencing potassium ion secretion is its concentration in blood plasma.

This is the liquid portion of the blood and serves as the transport medium for nutrients in the body.

When there is a high concentration in the plasma, it maximizes the concentration gradient which favors its secretion into the urinary fluid.

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The single most important factor influencing potassium ion secretion is concentration.

This is the liquid part of the blood present in the body and it transports nutrients throughout the body.

Whenever in the body there is high concentration of potassium ion as a result of which concentration gradient increases which in turn favors the secretion of potassium ion into the urinary fluid.

Hence concentration is the important factor.

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Mass is the weight of the compound or the molecule in a sample that is given in grams. The mass of sucrose in the sample is 171 gms.

The mass of the compound is the product of the molar mass of the compound and the number of moles of the compound in a sample.

Given,

The molar mass (m.w.t) of sucrose = 342.3 g/mol

Number of moles (n) of sucrose = 0.500 moles

The mass of sucrose is calculated as:

[tex]\begin{aligned} \rm mass &= \rm molar\; mass \times moles \\\\&= 342.3 \times 0.500\\\\&= 171.15 \;\rm gm\end{aligned}[/tex]

Therefore. the mass of sucrose in the sample is option A. 171 gms.

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Answer:

The key difference between dissociation and solvation is that dissociation is the breakdown of a substance into the atoms or ions from which the substance is made of whereas solvation is the dissolution of a substance in a solvent due to the attraction forces between solvent molecules and the components.

Explanation:

Solvation refers to the process of surrounding solute particles with solvent molecules, leading to the formation of a solution. Dissociation specifically refers to the breaking apart of ionic compounds or molecules into their constituent ions when dissolved in a solvent.

Solvation occurs due to the attractive forces between the solute and solvent molecules, such as dipole-dipole interactions or hydrogen bonding. The result of solvation is the formation of a homogeneous solution where the solute particles are evenly distributed at the molecular level within the solvent.

Ionic compounds are composed of positively charged cations and negatively charged anions held together by electrostatic forces. When an ionic compound is dissolved in a solvent, such as water, the solvent molecules interact with the compound's ions, pulling them apart and surrounding them.

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Answer:

0.2 moles

Explanation:

The equation is given by;

2HCl => H² + Cl²

According to stoichiometry;

[tex] \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} [/tex]

[tex]nhcl = 2 \times nh {}^{2} [/tex]

To produce 0.62 moles of H² gas we need,

nHCL=2×0.62=1.24 moles

Using the relation;

number of moles:Number of atoms/Avogadro's constant

We can then say;

N(numb. of atoms)=n×Na

Number of atoms=1.24×6.02×10²³

Number of atoms=7.5852×10²³ atoms

Answer:

tap water Is the pure substance

Answer:

Ethanol is pure

Explanation:

Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure

Answer:

Dams can stop a place from flooding and give us electricity without creating pollution. It can also make a place dry and finish water for animals

Explanation:

Answer:

turn it

Explanation:

Accurate information

Answer:

For The first one I think its the + if not try -
For the second one I believe its the first - sign

Explanation:

Answer: By reacting with the hydrogen ions.

Explanation:

Iodine and quaternary ammonium are chemical sanitizers approved for operations.

These are chemicals which help to remove pathogens from the surface of materials.

Iodine and quaternary ammonium are able to do that in a safe manner. This is therefore the reason why both of them were approved as sanitizers and chosen as the most appropriate options.

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Answer:

45830.4 moles

Explanation:

Ideal gas law is the hypothetical equation in which the pressure, volume, and temperature of the gas are directly related. It can be denoted as:

PV = nRT

The ideal gas law is:

PV = nRT

where,

P = Pressure

V = Volume

R = Gas constant

T =Temperature

n = moles

Given:

Moles in container = 1.95

Temperture = 294.85 K

Pressure = 3.75 atm

Volume =?

Substituting the values:

V = nRT/P

V = 1.95 × 0.082 × 294 / 3.75

Volume = 12.5 L

Now, the condition when changed, such that temperature is 301.25 K, pressure is 0.998 atm, and Volume is 12.5 L, then moles will be equal to:

PV/RT = n

0.998 × 12.5 / 0.082 × 301.25 = n

n = 45830.4 moles

Therefore, 0.521 moles is still present in the container.

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Answer:

3,550,000

Explanation:

3 significant figures is a number which has 3 figures

and zeros ( zero is not a figure )

Answer:

3550,000

Explanation:

Rounding rule:

If > 5 enter one

If < 5 rounding

Note:

< = less than

> = greater than.

Solve:

Base on the given:

it < 5 rounding

Thus,

3545,530 ≈ 3550,000

~Lenvy~

The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )

To determine the atom we will have to determine the molar mass of the atom

Applying De Broglie equation

λ = h / mv

Vrms = [tex]\sqrt{\frac{3RT}{M} }[/tex]  ---- ( 1 )

Where : λ  = 2.31 * 10⁻¹¹,  R = 8.314 J / k.mol,  T = 373 K, h = 6.626 * 10⁻³⁴ J.s

From equation ( 1 )

M = ( h² Ua ) / 3RT*λ² --- ( 2 )

where : Ua ( mass of an atom ) = 6.022 * 10²³,  h = 6.626 * 10⁻³⁴,  R = 8.314 J / k.mol, λ  = 2.31 * 10⁻¹¹,    T = 373 K

Insert values into equation ( 2 )

M ( molar mass ) = 32 g/mol

Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.

Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).

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Answer:

Explanation:

At the outer zone of candle flame, there are more oxygen available for the combustion reaction. So the flame is yellow in color.

The answer is D. yellow.

Answer:

B. blue

Explanation:

The candle's flame is divided into three zones: blue on the outside, yellow in the midst, and black on the inside. This is the result of the wax that is formed after the meltdown of the candle.

I am joyous to assist you at any time.

The world is divided into large areas based on their average temperatures and precipitation is called climate zones.

The principal zones that are demarcated by lines of latitude due to which the earth can be divided on the basis of climate. Tropical zone, Subtropics zone, Temperate zone and Cold zone are the four types of climatic zones.

So we can conclude that large areas based on their average temperatures and precipitation is called climate zones.

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The world is divided into large areas called climate zones based on their average temperatures and precipitation.

Climate zones are areas of the Earth that results from differences in climate such as temperature, humidity, amount of precipitation etc.

Climate zones of the globe are as follows:

Therefore, it can be said that the world is divided into large areas called climate zones based on their average temperatures and precipitation.

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Mole is the ratio of the mass to the molar mass of the substance and its unit is mol. The moles of isopropanol in the sample are 1. 31 moles.

Moles are the unit of measurement of the smallest entity of atoms, molecules, and compounds.

Given,

Mass of isopropanol (m) = 78. 6 g

Molar mass of isopropanol = 60. 1 g/mol

Moles of isopropanol is calculated as:

[tex]\begin{aligned} \rm moles (n) &= \rm \dfrac{mass}{molar \; mass}\\\\&= \dfrac{78.6}{60.1}\\\\&= 1.31\;\rm moles\end{aligned}[/tex]

Therefore, moles of isopropanol are option b. 1.31 moles.

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Acid rain removes nutrients from soil and Ocean waters become more acidic.

Ocean waters become more acidic when carbon dioxide from the atmosphere dissolves in seawater because the carbondioxide reacts with water produces carbonic acid.

When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain.

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Answer:

How do changes in the atmosphere from burning fossil fuels affect plant life? Select the two correct answers.

-Acid rain removes nutrients from soil.

-Increased ozone levels slow plant growth.

What happens when carbon dioxide from the atmosphere dissolves in seawater?(1 point)

-Ocean waters become more acidic

Which of the following chemicals are pollutants released when people burn fossil fuels? Select the two correct answers.(1 point)

-nitrogen dioxide

-sulfur dioxide

How does the use of fossil fuels affect the cryosphere?(1 point)

-Higher levels of greenhouse gases in the atmosphere cause sea ice to melt.

Why are rising carbon dioxide levels in the atmosphere harmful?(1 point)

-Carbon dioxide traps heat in Earth's atmosphere.

Explanation:

After the dillution of the solution, the wavelength of maximum absorption is decreased.

The wavelength of maximum absorption is the wavelength at which the solution absorbs the maximum amount of light. It is usually shown as a hump in the spectrum.

When the starting concentration of the  K2Cr2O7 is diluted, the wavelength of maxium absorption decreases.

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At an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L

Avogadro's law states that equal volumes of different gases contain an equal number of molecules provided temperature and pressure remains in the same conditions. It is expressed;

V₁/n₁ = V₂/n₂

Given the data in the question;

To determine the new volume, we substitute our given values into the expression above.

V₁/n₁ = V₂/n₂

V₁n₂ = V₂n₁

V₂ = V₁n₂/n₁

[tex]V_2 = \frac{5.00L * 1.80mol}{0.965mol}\\\\V_2 = \frac{5.00L * 1.80}{0.965}\\\\V_2 = \frac{9L}{0.965} \\\\V_2 = 9.22L[/tex]

Therefore, at an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L

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Answer:

the N at the top is north bottom is south w on your left is west and e of your right is east

Answer:

Electronic configuration of nitrogen: K=2 L=5

Electronic configuration of phosphorus : K = 2 L = 8 M = 5

The element nitrogen will be more electronegative because of the smaller size of its atom. nitrogen accepts electrons more easily.

Explanation:

Explanation:

Nitrogen is more electronegative than phosphorus.

Reason :-

From top to bottom down a group, electronegativity decreases.

Explanation :-

Number of shell increases down a group, so there is an increased distance b/w the valence electrons and nucleus, or a greater atomic radius.‎ ‎

       Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. So , because of smaller atomic size nitrogen accepts electrons more easily.

The next stage of exploration should be gathering information about the planetary system.

Once we confirm other planetary systems, the next stage of exploration should be the use of instruments that helps us to collect information about that planetary objects so we can conclude that the next stage of exploration should be gathering information about the planetary system.

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Answer:

ΔS=2.303 n Rlog(

V

1

​

V

2

​

​

)

=2.303×10×8.314log(

10

100

​

)=191.47 JK

−1

Thus ΔS=191.47JK

−1

Explanation:

From the table showing the data involving the neutralization reaction between HCl and NaOH, the concentration of the HCl solution would be 0.864 M

From the available data:

Volume of acid used = 0.0351 - 0.0131 = 0.022 L

Volume of base used = 0.0575 - 0.0385 = 0.019 L

Concentration of base = 1.00 M

Number of moles of acid and base = 1

Using the equation:                      CaVa/CbVb = Na/Nb = 1

Ca = 1x0.019/0.022 = 0.864 M

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The limiting reactant for the combustion reaction for acetylene is oxygen.

Limiting reagents are those reagent which is present in less quantity as compared to the other reagent present for the formation of product.

Given chemical reaction is:

2C₂H₂(l) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)

From the stoichiometry of the reaction, it is clear that:

2 moles of C₂H₂ = react with 5 moles of O₂

37 moles of C₂H₂ = react with 5/2×37=92.5 moles of O₂

And given moles of oxygen is 81 moles.

81 moles of O₂ = reacts with 2/5×81=32.4 moles of C₂H₂

And given moles of C₂H₂ = 81 moles.

Hence, O₂ is the limiting reagent.

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Answer:

O2 is the limiting reactant.

The element which is likely to have a high thermal conductivity among given options is sodium.

Thermal conductivity of any substance is define as the capability of the substance to carry heat or transfer of heat.

As we know that metals are the good conductors of heat and non-metals are bad conductors, so we exclude carbon, antimony and chlorine atom from this group as they are non-metals. And sodium atom has the thermal capability.

Hence option (4) is correct.

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Answer: Option (4) is correct

Explanation:

Answer:

evaporation

Explanation:

Evaporation occurs when a liquid changes to a gas. During evaporation, molecules gain enough thermal energy to escape from the liquid surface into the air as water vapor.

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The structures of the two intermediates and the final product of the Grubbs catalysis reaction are shown in the attached image, with emphasis on the stereochemistry of the two intermediates and the end product.

Intermediates are those species which are formed during the process of any chemical reaction which in turn finally converts into products.

Stereochemistry is a discipline of chemistry that studies the three-dimensional structure of molecules and how it influences their physical and chemical properties.

According to the question it is discussing about the Grubbs catalysis reaction which is a transition metal carbene series complex in which mixture of two optical active compounds are obtained which are the intermediates which finally gives product after reduction.

Hence the required structures are shown in the attached image.

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