Which letter(s) represent(s) a phase change occuring?

Answer:

Explanation:

Here, we want to write the net ionic equation

We start by writing the complete equation of reaction:

Now, we write out the ions as follows:

The Chromium and Nitrate ions are spectator ions

Thus, we have:

The work done by the isothermal compression of the gas is -666.7 J.

The work done by the compression of a gas in an isothermal process or at constant temperature  is given by the formula below:

Work done, W = nRT ln(Vf / Vi)

where;

From the data provided:

number of moles, n = 0.250 moles

Molar gas constant, R = 8.314 J/K/mol

Temperature, T = 292 K

Vf = 2.00 L

Vi = 6.00 L

W = 0.25 * 8.314 * 292 * ln(2/6)

Work done = -666.7 J

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The ph after 25.0 ml of the naoh solution have been added is 1.222.

You are aware that the balanced chemical equation states that sodium hydroxide and hydrochloric acid balance each other out in a 1:1 mole ratio.

NaOH (l) + HCl (l) = NaCl (l) + H2O (l)

As a result, equal amounts of sodium hydroxide and hydrochloric acid must be used to completely neutralize a substance, producing a neutral solution with a pH of 7 at ambient temperature.

Although the molarities of your two solutions are equivalent, the hydrochloric acid solution has a volume of 100 mL divided by 25.0 mL, which equals four.

[tex][H3O+]=(75⋅0.100103).moles H3O+125⋅103.L=(75⋅0.100125)mol L−1This means that you havepH=−log(75⋅0.100125)=1.222−−−−−[/tex]

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Cellular respiration and photosynthesis similar is both processes break down glucose

Photosynthesis converts carbon dioxide and water into oxygen and glucose and glucose is used as food by the plant and oxygen in a byproduct whereas cellular respiration converts oxygen and glucose into water and carbon dioxide and both processes break down glucose and both are processes within the cell which make chemical energy available for life

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The average molar mass of sulfur is 32.84g/mol

The average atomic mass of a chemical element is calculated by taking into account the atomic masses of its naturally occurring isotopes and their respective abundances

Here given data is natural sulfur consists of three isotopes :

95.0% sulfur-32 = 31.97 amu

0.75% sulfur-33 = 32.97 amu

4.21% sulfur-34 = 33.96 amu

So, we have to find average molar mass of the sulfur = ?

Formula for average molar mass = ∑i × isotope i  × abundance i

³²S = 95.0% abundance = 31.97 amu

³³S = 0.75% abundance = 32.97 amu

³⁴S = 4.21% abundance = 33.96 amu

This means that average molar mass of sulfur is

Average molar mass = 31.97 amu×95.0 +  32.97 amu× 0.75 + 33.96 amu×4.21

Average molar mass = 32.84g/mol

Average molar mass of sulfur is 32.84g/mol

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1.enthalpy ΔH = -45.1872 Kj/mol

2.enthalpy ΔH = -2.092 Kj/mol

3.enthalpy ΔH = -13.888 Kj/mol

A thermodynamic system's internal energy and the product of its pressure and volume are added to form enthalpy, which is one of the system's properties. It is a state function that is frequently used to monitor chemical, biological, and physical systems at a constant pressure that is conveniently given by the sizable surrounding environment. The labor necessary to determine the system's physical dimensions, or to make room for it by displacing its surrounds, is expressed by the pressure-volume phrase. Under typical conditions, the pressure-volume term is very small for solids and liquids and moderately small for gases. As a result, in chemical systems, enthalpy serves as a stand-in for energy; bond, lattice, solvation, and other concepts referred to as "energies" in chemistry are actually differences in enthalpy.

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To solve this we need to have knowledge of differential rate law which relate the rate to the concentration and time The option B is correct option.

A differential rate law represents the rate of a reaction . According to this rate is directly proportional to changes in the concentration of reactants and inversely proportional to specific interval of time. There is another expression of rate law which is integrated rate law which is just opposite of differential rate law

The given equation is

[tex]A+3B\rightarrow2C[/tex]

Rate of B= rate of C

[tex]\frac{1}{3}d\frac{[B]}{dt} =\frac{1}{2}d\frac{[C]}{dt}[/tex]

[tex]d\frac{[B]}{dt} =\frac{3}{2}d\frac{[C]}{dt}[/tex]

Thus option B is correct option.

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The conversion of NO to N2 is the reaction that takes place in the catalytic converter of an automobile.

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Answer:

Explanation:

Here, we want to get the value of the oxidation number of Z

Generally, hydrogen has an oxidation number of +1, while oxygen has an oxidation number of -2

The total oxidation number is zero

Thus:

Answer:

salt

Explanation:

cause salt is a solid item

The wavelength of these radio waves with a frequency 18GHz is equal to 0.0167m.

Microwave transmission is the method of transmission of information by electromagnetic waves that lie in the microwave range (1 m - 1 mm) of the electromagnetic spectrum. Microwave signals are limited to the line of sight, so long-distance transmission using these signals needs a series of repeaters to create a microwave relay network.

The relationship between wavelength (λ) and frequency (ν) can be expressed as follow:
λ = c/ν

Given, the frequency of the radio wave = 18GHz

The frequency in (per second) = 18 × 10⁹ s⁻¹

The wavelength of the radiowaves, λ = c/ν

where c is the speed of light and has a value of 3× 10⁸ m/s.

λ = c/ν = 3× 10⁸ m/s./ 18 × 10⁹ s⁻¹

λ = 0.0167 m

Therefore, the wavelength of these radio waves is equal to 0.0167m.

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Your question was incomplete, most probably the complete question was,

NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 18GHz. Calculate the wavelength of these radio waves.

Be sure your answer has the correct number of significant digits.

500 ie2 (kj/mol) would be expected for an element.

The value of IE2 (second ionization energy) is 16 times more than IE1(first ionization energy). So, the elements easily release outer most one electron as the IE1 value is low. But, it is very reluctant to release second electron which reflected in the IE2 value. Therefore, the element will form 1+ ion.

What is ionization energy?

Ionization energy may be defined simply as a measurement of how difficult it is to remove an electron from an atom or ion or of an atom's or ion's propensity to give up an electron. Usually, when a chemical species is in its ground state, an electron is lost.

As an alternative, we might say that ionization or ionization energy is a measurement of the intensity of the attractive forces that hold an electron in a certain location.

Therefore, 500 ie2 (kj/mol) is the answer.

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The ending or suffix of the hydrocarbon name tells the bonds found between carbon atoms in the molecule. Therefore, option (B) is correct.

Hydrocarbons are entirely made up of only two kinds of atoms which are carbon and hydrogen. Hydrocarbons are typically colorless gases and weak odors. Hydrocarbons can be relatively complex structures and can be classified into four subcategories, alkanes, alkenes, alkynes, and aromatic hydrocarbons.

Hydrocarbons such as propane and butane are used for commercial fuel purposes in the form of LPG and the molecular formula for the compounds is CxHy.

In the nomenclature of hydrocarbons, the suffix of the name indicates what type of bond is present between the atoms. If all carbon atoms have a single covalent bonds then the suffix is "ane". If one or more carbon-carbon double bonds are present then the suffix is "ene". If the triple bond is present then the suffix in the name of the hydrocarbon is "yne".

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The correct answer is option C: Catalyst

A substance that helps a reaction to take place, but does not participate in the reaction is called a catalyst.

In Chemistry, a catalyst is defined as a substance that increases the rate of a chemical reaction without itself undergoing any changes. This process is called catalysis.

There are 3 different types of catalysts: enzymatic, homogeneous, and heterogeneous.

The catalytic substance remains unchanged and does not consume during the reaction, Their only job is to speed up the reaction by breaking bonds and saving time and energy.

For example, during the commercial preparation of ammonia also called the 'Haber process' iron is added as a catalyst to accelerate the reaction rate.

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2.83 lamda is the wavelength of a wave with a frequency of 105.7 x10^6 Hz in here.

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The balanced version of the half reaction is H2S - S + 2H+ , this is how we balance half reactions.

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Answer: the answer is D) The first equation should be multiplied by 9 and the second equation by −4.

Explanation:edge 2022

Answer:

Barium sulfate, BaSO4, is made by reacting barium hydroxide and other barium sources with sulfuric acid and has a long history as a translucent white pigment.

Calculate the mass, in amu, of 278 atoms of Li.

1) We need to find Li (Lithium) in the periodic table.

1) The atomic mass of Lithium is 6.94 u.

2) We can cancel some units and rearrange the equation.

3) Multiply the equation above by the number of atoms

The mass of 278 atoms of Lithium is 3.20*10^-21 u

The molarity of hydrobromic acid is 0.2909 M and molarity of barium hydroxide is 0.1517 M.

The balanced chemical reaction of hydrobromic acid(HBr) and barium hydroxide(Ba(OH)2) is :2HBr(aq) + Ba(OH)2(aq)     BaBr2(aq) + 2H2O(l)

So for every 2 moles of hydrobromic acid (acid) 1 mole of barium hydroxide(base) is used for neutralisation.

It is given that 22.0ml of 0.162M solution of barium hydroxide is used for complete neutralisation So no of millimoles of base used =22*0.162=3.564

Number of millimoles of acid required=2*3.564=7.128

Let x be the molarity of acid.then x multiplied by volume(in ml) would give the number of millimoles as molarity=moles/volume7.128=x*24.5x=0.2909

So molarity of hydrobromic acid is 0.2909 M

The balanced chemical reaction of hydroiodic acid (HCl) and barium hydroxide(Ba(OH)2) is :2HI (aq) + Ba(OH)2 (aq)    Bal2(aq) +2H2O(l)

So for every 2 moles of hydroiodic acid (acid) 1 mole of barium hydroxide(base) is used for neutralisation.

It is given that 18.8 ml of 0.197M solution of hydroiodic acid is used for complete neutralisation

So no of millimoles of acid used = 18.8*0.197=3.7036Number of millimoles of base required=3.7036/2=1.8518

Let x be the molarity of base.then x multiplied by volume(in ml) would give the number of millimoles as molarity=moles/volume1.8518=x*12.2x=0.1517So molarity of barium hydroxide is 0.1517 M

Therefore, molarity of hydrobromic acid is 0.2909 M and molarity of barium hydroxide is 0.1517 M.

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Physical change of a substance involves the change in phase or state. The physical change which is endothermic is, conversion of solid carbon to gaseous carbon.

Endothermic reactions are those which absorbs heat energy to give the products. Thus heat is taken into the reaction system hence the name endothermic.

In exothermic reactions, the heat energy is released by the reaction system, where the heat is exiting hence the name exothermic.

When solids changes to gaseous state, the tightly packed molecules in the solid state requires much energy to move apart and to overcome the intermolecular forces of attraction.

Liquid to gas does not require these much energy and gas to liquid evolves energy out.  Therefore, the physical change given here which is  endothermic is conversion of solid carbon dioxide to gas carbon dioxide.

Hence, option D is correct.

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At STP, the volume of oxygen of mass 250g is found to be 175mL.

Volume is the amount of space occupied by an item or substance. Volume is a measurement of how much 3-dimensional space an object occupies. Volume is the measurement of a limited quantity of area at a specific end.

Mass is a measurement of the quantity of matter in an item or substance. Mass is the physical quantity that represents the amount of matter in an object's body. The amount of weight accommodated in an item or stuff is measured in mass.

Density - The amount of space taken up by an item or substance (its volume) in proportion to the amount of matter in that thing or substance (its mass).

Given:

Mass = 250g = 0.25kg

Density at STP = 1.4291g/L

To find:

Volume = ?

Formula:

Density = Mass / Volume

Calculations:

Volume = Mass / Density

Volume = 0.25 / 1.4291

Volume = 0.175L

Volume = 175mL

Result:

The volume of oxygen of mass 250g is found to be 175mL at STP.

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Each solution has a concentration of 7.625 x 103 m, 3.8125 x 104 m, and 1.90625 x 105 m, respectively.

Dilution is the process of lowering a sample's concentration by incorporating more solvent, according to its definition. The following is the dilution formula.

C₁V₁ = C₂V₂

where C1 is the sample's initial concentration.

V1 is the initial sample volume.

After dilution, the ultimate concentration is C2.

After dilution, the ultimate total volume is V2.

Calculate the concentration of the diluted solution by entering the numbers into the formula.

first common answer

C₁V₁ = C₂V₂

0. 1525 m(5.00 ml) = C₂(100.0 ml) (100.0 ml)

C₂ = 7.625 x 10⁻³ m

Second common solution

C₁V₁ = C₂V₂

7.625 x 10⁻³ m(5.00 ml) = C₂ (100.0 ml)

C₂ = 3.8125 x 10⁻⁴ m

Third accepted option

C₁V₁ = C₂V₂

3.8125 x 10⁻⁴ m(5.00 ml) = C₂(100.0 ml) (100.0 ml)

C₂ = 1.90625 x 10⁻⁵ m

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when 35.0kg of sio2 react with 25.3kg of c, 14.4kg of si are recovered.

The percent yield for the reaction is 8.8012%

sio2 + 2c = si + co

moles of sio2 = 35*[tex]10^{3}[/tex] / 600.02   = 582.503mol

moles of c = 25*[tex]10^{3}[/tex] / 12 = 2.1083 kcal

yield = moles of si produced / mole of sio2 used

        = 512.72/582.36  * 100

        = 8.8012%

chemical reaction is a process in which one or more substances the reactants—are changed into one or more additional substances the products. Chemical elements and compounds are both substances. To produce various compounds as products, a chemical reaction rearranges the atoms that make up the reactants.

Technology, culture, and life itself are all influenced by chemical interactions. Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese. Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, include chemical interactions.

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The net ionic reaction equation for the change that happens when strong base is added to this buffer looks like this:

CH₃COOH(aq) + OH⁻(aq) → CH₃COO⁻(aq) + H₂O(l)

To solve this problem, we need to consider what will happen when a strong base is added to a buffer solution made from acetic acid and sodium acetate. All buffers have a basic and an acidic component. In this one the acidic component is, obviously, acetic acid, a weak acid.

When making a buffer based on a weak acid, the basic component is usually a salt of that acid, in this case, sodium acetate.

When a strong base is added to the buffer, it will dissociate to yield the metal cation and the OH⁻ anion. The basic OH⁻ anion will interact with the acidic component, neutralizing it and forming the acetate ion and water.

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In case of exothermic or endothermic reactions  where heat is  absorbed  or released  there is a need to measure specific heat, change in temperature and time to heat.

An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.

In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.

Examples of exothermic reactions are combustion reactions, detonation of nitroglycerin , neutralization reactions and nuclear fission.

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The percent yield of this reaction when based on the amounts of starting materials used, a chemist calculates a possible yield of 213.4 g in a reaction and isolating her purified product, she finds that she has only 198.5g of products is 93%

The percent yield is the experimental yield upon theoretical yield divided by 100

The experimental yield is 198.5 g

The theoretical yield is 213.4 g

The percent yield is as follows;

% yield= 198.5 g/213.4= 0.93x100

%yield=93%

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