The second order reaction A → Products takes 13.5 s for the concentration of A to decrease from 0.740 M to 0.319 M. What is the value of k for this reaction?

Considering the definition of percentage by mass,  the mass of ammonium sulfate that must be added to prepare 200.0 g of a 3.5% solution of ammonium sulfate in water is 7 g.

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

[tex]percent by mass=\frac{mass of solute}{mass of solution}x100[/tex]

In this case, you know:

Replacing in the definition of percent by mass:

[tex]3.5 =\frac{mass of ammonium sulfate}{200 g}x100[/tex]

Solving:

3.5÷100= [tex]\frac{mass of ammonium sulfate}{200 g}[/tex]

0.035= [tex]\frac{mass of ammonium sulfate}{200 g}[/tex]

0.035×200 g= mass of ammonium sulfate

7 g= mass of ammonium sulfate

Finally, the mass of ammonium sulfate that must be added to prepare 200.0 g of a 3.5% solution of ammonium sulfate in water is 7 g.

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Chemical property:

Physical property:

Lipids are made up of long hydrocarbon chains and is not soluble in water.

Hence, Option C is correct answer.

Carbohydrate is water soluble macromolecule because they are small polar molecules contains many -OH functional groups that makes it hydrophilic.  

Nucleic acids are long polymeric chain. They are hydrophilic in nature. Nucleic acid are soluble in water because of their polar nature.

Lipids are hydrophobic and they are generally water insoluble because lipids are non polar molecules. Lipids are oily or greasy molecules. Lipids are made up of glycerol molecule. It includes fatty acids.

Thus from the above conclusion we can say that Lipids are made up of long hydrocarbon chains and is not soluble in water.

Hence, Option C is correct answer.

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Answer:

02

Explanation:

The basic concept of getting this right is to divide the individual coefficient of the reactant by the giving mass. the one with the least value scores the limiting reactant or reagent

The name of Pb(NO3)2 of is Lead II trioxonitrate V

The bond which exist in is Lead II trioxonitrate V ( Pb(NO3)2 ) are both ionic and covalent bond

A compound is a substance which contains two or more elements chemically combined together

So therefore, the name of Pb(NO3)2 of is Lead II trioxonitrate V

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I think it should be suspension.

The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the balanced chemical equation

Zn + 2HI → ZnI₂ + H₂

Here Zn is a reducing agent, HI is an oxidizing agent.

Thus from the above conclusion we can say that The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.

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0.18 M nitrous acid + 0.13 M sodium nitrite is a good buffer system.

Hence, Option A is correct answer.

It is a solution that prevent any changes in the pH of the solution on the addition of an acidic and basic components.

Now lets check all options one by one:

Option (A): 0.18 M nitrous acid + 0.13 M sodium nitrite

Nitrous acid is a weak acid and sodium nitrate is a conjugate base. This is a buffer.

Option (B): 0.27 M nitric acid + 0.25 M sodium nitrate

Nitric acid is a strong acid and sodium nitrate is neutral salt. So this is not good buffer.

Option (C):  0.29 M ammonia + 0.40 M potassium hydroxide

Potassium hydroxide is a strong base and Ammonia is also a strong base. So this is not a good buffer.

Option (D): 0.15 M sodium hydroxide + 0.30 M sodium chloride

Sodium hydroxide is a strong base and Sodium chloride is a ionic salt. So this is not a good buffer.

Option (E): 0.32 M sodium chloride + 0.20 M calcium chloride

Sodium chloride is a ionic salt and calcium chloride is a salt of strong acid. So this is not a good buffer.

Thus from the above conclusion we can say that 0.18 M nitrous acid + 0.13 M sodium nitrite is a good buffer system.

Hence, Option A is correct answer.

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The rate of percolation of water into the soil will be 0.125 mL per second

The rate of percolation of water into the soil is determined by the volume of water that enters the soil per unit of time under specific conditions.

In this case, 750 mL of water percolated in 100 minutes.

100 minutes = 100 x 60 = 6,000 seconds

Percolation rate = 750/6000 = 0.125 mL per second

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From the calculation, the compound is MgSO4.2H2O.

A hydrated salt is a salt that contains molecules of the water of crystallization.

a) Percentage of the water of crystallization =  3.211 g  - 2.539g/ 3.211 g * 100/1 = 21%

b) Number of moles of water of crystallization = 3.211 g  - 2.539g/ 18 g/mol =

0.037 moles

c) Number of moles of anhydrous salt =  2.539g/120 g/mol = 0.021 moles

Number of moles of hydrated salt = 3.211 g/120 + 18x

Hence;

0.021 = 3.211 /120 + 18x

0.021(120 + 18x) =  3.211

2.52 +  0.378x = 3.211

0.378x  = 3.211  - 2.52

x = 3.211  - 2.52/ 0.378

x = 2

Hence the compound is MgSO4.2H2O

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The balanced chemical equation for the reaction is:

2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Sodium hydroxide => NaOH

Iron (II) chloride => FeCl₂

2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)

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The entropy change will be negative because the number of particles in the system decreased from left to right.

The term entropy refers to the degree of disorder in a system. We know that the production of gases would lead to an increase in the entropy of the system.

Now given the equation;  N₂ (g) + 3H₂ (g) --> 2NH₃ (g), the entropy change will be negative because the number of particles in the system decreased from left to right.

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The mass of carbon dioxide, CO₂ that would be produced from 5 moles of ethanol, C₂H₅OH is 440 g

We'll begin by calculating the moles of carbon dioxide, CO₂ produced. This can be obtained as follow:

C₂H₅OH + 3O₂ --> 2CO₂ + 3H₂O

From the balanced equation above,

1 mole of C₂H₅OH reacted to produce 2 moles of CO₂

Therefore,

5 moles of C₂H₅OH will react to produce = 5 × 2 = 10 moles of CO₂

The mass of carbon dioxide, CO₂ produced from the reaction can be obtained as follow:

Mole = mass / molar mass

10 = Mass of carbon dioxide, CO₂ / 44

Cross multiply

Mass of carbon dioxide, CO₂ = 10 × 44

Mass of carbon dioxide, CO₂ = 440 g

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The mass of melted gold to release the energy would be  3, 688. 8 Kg

It is important to note that the formula for  energy is

Q = n × HF

Where

n = number of moles

HF = heat of fusion

Let's find number of moles

235.0 = n × 12.550

number of moles = [tex]\frac{235}{12. 550}[/tex] = 18. 725 moles

The molar mass of Gold is 197g/ mol

We have that;

Number of moles = mass/ molar mass

Mass = number of moles × molar mass

Substitute the values

Mass = 18. 725 × 197

Mass = 3, 688. 8 Kg

Thus, the mass of melted gold to release the energy would be  3, 688. 8 Kg

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Answer:

A ship comprises of both visible as well as invisible parts. . The most forward part of a ship is called a Bow, the left-hand side of . at a topmost accessible height of the ship and just above the bridge . The mast is a rangy spar arrangement which is elevated more or less vertically to the Centre line of a ship .

This will give the value of 7.9311m2

( 5.57m / 0.63m ) - ( 1.11m * 0.82m )

=  8.8413 - ( 1.11m * 0.82m )

= 8.8413 - 0.9102m2

= 7.9311m2

Dividing a value in meter by another value in meter results in the cancellation of both the units and the resulting answer will have no unit.

Multiplying a value in meter by another value in meter it will result in the square meters. It can be written as m2 and can be read a meter square.

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Taking into account the definition of dilution, the initial volume needed to prepare each of the diluted solution is 145.59 mL.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

17% (m/v)× Vi= 7.5% (m/v)× 330 mL

Solving:

Vi= (7.5% (m/v)× 330 mL)÷ 17% (m/v)

Vi= 145.59 mL

In summary, the initial volume needed to prepare each of the diluted solution is 145.59 mL.

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An element is a substance that cannot be broken down by chemical means. Elements are extremely particular compounds that serve as the foundation for all life and matter (well other than the stuff smaller than atoms). It can contain one atom or trillions of them for anything to be an element, however atoms of different types cannot be combined in. That is to say, every atom has a set number of protons, ranging from 1 to 118. You can be positive that the substance you have is hydrogen if there is just one proton present. Mercury is what you get if you have 80 protons. Atoms of pure hydrogen only contain one proton. As most people are aware, if you add oxygen to it, it turns into water, which is no longer an element but a compound. Nevertheless, the building blocks are the elements. Every single object you can see is composed of elements, whether there are many of them, as there are in the human body, or only a few, as there are in salt.

A compound is a substance with a definite composition (with some leeway there, there are 'non-stoichiometric' compounds), that is composed of 2 or more elements.

Further explanation:

A compound in chemistry is a material that is created by mixing two or more distinct chemical elements in such a way that the atoms of the various elements are kept together by strong chemical bonds. These bonds form as a result of the sharing or exchange of electron s among the atoms. A molecule is the smallest, unbreakable unit of a substance.

A mixture is not a compound since there is no bonding between the atoms of the constituent substances in a mixture. In certain cases, mixing dissimilar elements causes chemical reactions that result in the formation of bonds between the atoms and the molecules of a compound. Other possibilities allow mixing distinct components without causing a reaction, preserving the separate identities of the elements. When elements are combined, reactions can happen quickly or slowly (for example, when iron is exposed to oxygen) (as when lithium is exposed to oxygen). There are times when an element is introduced to a chemical, a reaction takes place, creating new compounds (as when pure elemental sodium is immersed in liquid water).

A compound frequently looks and acts quite different from any of the constituent parts. Think about hydrogen (H) and oxygen, for instance (O). At standard atmospheric pressure and room temperature, both of these substances are gases. However, they combine to form the well-known material known as water, which is a liquid at room temperature and at normal atmospheric pressure and whose molecules each contain two hydrogen atoms and one oxygen atom (H2O).

Few elements' atoms readily combine with those of other elements to produce compounds. These gases—helium, neon, argon, krypton, xenon, and radon—are referred to as noble or inert gases. Compounds made of certain elements can be formed easily with other elements. Examples include fluorine, chlorine, and oxygen.

2) The adjective compound refers to something that is made up of several different components. Examples of this usage include compound eyes, which are found in a variety of insects, compound microscopes, which are high-power magnifying devices made up of multiple lenses, compound sentences, which are organized collections of smaller sentences that form a single integrated perceptual environment, and compound documents.

Answer:

Oxidation - K

Reduction - Cu

Explanation:

2K --> 2K^+

Cu^+2 --> Cu

Answer:

Potassium chloride.

C10H22 is a compound which is the most soluble in CC14 because both are non-polar in nature.

We know that like dissolve like which means that polar solutes only  dissolve in polar solvent while on the other hand, non-polar solutes only dissolve in non-polar solvent.

So we can conclude that C10H22 is a compound which is the most soluble in CC14 because both are non-polar in nature.

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Answer:

Hydrolysis of 1-cyano-methylbenzene is an addition reaction while that of 1-cyano-4-methylbenzene is a substitution substitution reaction.

Explanation:

substitution reactions occur in preference to addition reactions

Answer:

it's state changes from solid to liquid

The sign of the entropy change, ΔS, for the following processes include:

What is Entropy?

This is referred to the degree of randomness or disorderliness of a system and is denoted as S.

Entropy change is usually positive when solid or liquid reactant is converted into gas product and vice versa.

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Mechanical waves can help in the treatment of cancer due to heat generated by the high frequency waves.

A mechanical wave is a wave that requires material medium for its propagation, example include;

Sound wave in example of mechanical wave because it requires material medium for its propagation.

High-frequency sound waves (HIFU) is used in the  treatment  of cancer because the strong beam generates heat which is directed to a specific part of a cancer.

The heat generated destroys the cancer cells.

Thus, mechanical waves can help in the treatment of cancer due to heat generated by the high frequency waves.

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Answer:

9.4x10^-1

Explanation:

You have to move the decimal left 3 times so you subtract 3 from the power (2) and get -1