Can you please tell me

The enthalpy of the reaction is obtained as 242 kJ/mol

We define the term enthalpy as the heat that is evolved or absorbed in a chemical process. In this case, heat is evolved when the reaction occurs because a neutralization reaction is necessarily an exothermic reaction. This is because het is given off.

We have been supplied with the amount of that is produced in the process. Hence we have;

Number of moles of sodium metal = 0.442g /23 g/mol = 0.019 moles

Thus, we have the enthalpy as;

H = 4590 * 10^-3 kJ/0.019 moles

= 242 kJ/mol

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The balanced chemical equation for rusting iron is:

4Fe + 3O2 = 2Fe2O3

If we divide 1.0x10^9 by Avogadro's number, we get the amount of moles of oxygen which is 1.6611x10^-15 moles.

From the chemical equation we know that it takes 3 moles of oxygen to produce 2 moles of iron oxide. So if we multiply the moles of oxygen calculated by 2/3, we can get the moles of iron oxide.

(1.611x10^-15)(2/3)  = 1.107419x10^-15 moles of iron oxide.

If we multiply the moles of iron oxide by the molar mass of iron oxide, we get how many grams of iron oxide would be produced by 1 billion oxygen atoms. Which is the same thing as how many grams of iron oxide contain 1 billion oxygen atoms.  

(1.107419x10^-15)(159.69) = 1.8x10^-13 grams of Fe2O3  

In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a combustion reaction. The opposite process is a synthesis reaction

fireworks are a class of low explosive devices used for aesthetic and entertainment purposes

Here potassium nitrate is break down into the potassium oxide and nitrogen and oxygen which decomposes is by given burning it is also combustion reaction and the synthesis reaction is opposite to this reaction

2KNO₃ → 2KNO₂ + O₂

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The electrical charge of the nucleus of an atom is +12 then 12 electrons does the atom have in its neutral state

Basic property of matter carried by some elementary particles that governs how the particles are affected by an electric or magnetic field and when a neutral atom gains or loses electrons, it becomes an ion and heavier atoms tend to have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons and so an atom as a whole is electrically neutral

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For electricity generation, the three major parts of energy are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable power sources.

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Considering the given statements about the filament sliding model in muscles, the statement that is false is;

Muscle filaments or myofilaments are the three protein filaments that make up the myofibrils in muscle cells.

There are three main proteins filaments that make up the myofibrils, and they are:

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The velocity of the Rock is 34.5 m/s.

To learn more about :  Velocity

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There are 0.0476 moles in a gas at 273 K and 1.4 atm in a container with a volume of 30 L.

The mole (symbol: mol) is the unit of substance amount used by the International System of Units (SI). The amount of a material determines how many elementary entities of that substance are present in an object or sample.

A mole contains precisely 6.022 14076 × 1023 elementary entities. Depending on the substance, an elementary entity may be an atom, a molecule, an ion, an ion pair, or a subatomic particle like an electron. Ten moles of water, a chemical compound, and ten moles of mercury, a chemical element, both contain exactly one atom for each molecule of water, despite having differing volumes and masses.

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In the International Space Station on near-vacuum space, the bare metal surfaces can reach temperatures above 260℃ as the side of the station facing the sun receives thermal energy via electromagnetic radiation (A).

Space is nearly vacuum i.e., it has no air in space. Conduction and convection of heat requires air. As space is nearly vacuum, conduction and convection of heat does not happen on bare metal surface on International Space Station.

The only mode of heat transfer in space is Radiation. The space station surface facing away from sun would be cold as the stars are far away from our solar system to heat them up. Thus, the side of the station facing the sun receives thermal energy via electromagnetic radiation.

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Data we are collecting from the equation as:

7.4x10^23 = silver nitrate molecules as given in the question.

As we know Avogadro's no. 6.022*1023 which is a number of molecules.

So when we calculate any no. Of the mole of any atom we know that 1mole of any atom is equal to Avogadro's no and grams can be calculated from the mole's equation.

So back to the point,

Dividing molecules of AgNO3 to no. of molecules per mol of AgNO3

7.4 / 6.02*1023

= 1.229*1023per mole of AgNO3.

OK we get the moles of AgNO3

Now checking the gram of AgNO3

The weight of AgNO3 is 163.868.

Now multiplying both values moles*molar weight of AgNO3

1.229*1023 * 763.868 = 208.767grams of AgNo3

The possible masses of calcium oxide and carbon dioxide that can form when 400g of calcium carbonate undergoes decomposition is

The correct measurement of the element neon (Ne):

When reactants of a reaction are known, the fact that can always be deduced about the products is:

The correct molar mass correct for carbon dioxide (CO₂) is 44.01 g/mol; option B

The number of moles in 43 g of CO₂ is 0,977 moles.

According to the law of conservation of matter, the statement that best describes a balanced chemical equation:

The number of moles of atoms of each element must be the same in the reactants and in the products.

Based on the law of conservation of mass, the product of the reaction of nitrogen gas and hydrogen is 2 NH₃.

To calculate the number of moles from mass, take the quotient of mass and molar mass; option B

The ratio of components in the reaction of sugar with oxygen gas to produce carbon dioxide and water is:

For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed; option A

The molar mass of NH₄Cl is 53.5 g/mol; option A.

The decomposition of 1 mole of calcium carbonate yields 1 mole of CaO and 1 mole of CO₂ as shown in the equation below:

CaCO₃ ---> CaO + CO₂.

Molar mass of CaCO₃ is 100 g.

400 g of CaCO₃ is equal to 4 moles

4 moles of CaCO₃ produces 4 moles of CaO and CO₂

Mass of 4 moles of CaO = 4 * 56 = 224 g

Mass of 4 moles of CO₂ = 4 * 44 176 g

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From the reactivity order, we can see that Tin is more reactive than lead. Hence Tin can replace lead from its salt through the strip of solid lead metal.

A chart listing metals in decreasing order of reactivity is called the metals reactivity series.

A metal generally reacts with other chemicals more forcefully the more reactive it is. The easier it is for positive ions to form when losing electrons (cations).

An empirical, calculated, and structurally analytical progression of a group of metals, grouped in order of their "reactivity" from highest to lowest, is known as a "reactivity series" in chemistry.

The equations can be stated as

Pb(s) + Sn[tex](NO_{3})_2[/tex] (aq) → no reaction

Sn (s) + Pb [tex](NO_{3})_2[/tex] → reaction occurs

The final reaction can be stated as

Sn (s) + Pb [tex](NO_{3})_2[/tex] (aq) → Sn[tex](NO_{3})_2[/tex] (aq) + Pb(s)

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Complete Question

A strip of solid lead metal is put into a beaker of 0.045M Sn(NO3)2 solution.

A strip of solid tin metal is put into a beaker of 0.092M Pb(NO3)2 solution.

Provide the complete chemical reaction for the two statements.

Answer:

Explanation:

By creating complex ions, altering the solution's pH, or raising the temperature to redissolve part of the solids, metal ions that precipitate together can be separated using a variety of different methods.

The empirical formula of the caffeic acid is C₂H₂O.

The mass composition of the carbon and hydrogen in the carbon dioxide and water respectively is calculated as follows;

mass of carbon in 220 mg of CO₂ = (12 x 0.22 g)/(44) = 0.06 g

mass of hydrogen in 40.3 mg of H₂O = (2 x 0.0403 g) / (18) = 0.0045 g

mass of oxygen = 0.1 g - (0.06 g + 0.0045 g) = 0.0355 g

The molar composition of the elements is calculated as follows;

H = 0.0045 /1 = 0.0045

C = 0.06 / 12 = 0.005

O = 0.0355 / 16 = 0.0022

Divide through with the smallest molar composition

H = 0.0045 / 0.0022 = 2

C = 0.005/0.0022 = 2

O = 0.0022/0.0022 = 1

The empirical formula is C₂H₂O

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The complete question is below:

Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O. find the empirical formula of the caffeic acid.

There was distilled water in the cuvette when the student put the standard solution in it.

The correct option is A.

The concentration of a solution can be used to determine how much solute has been dissolved in a given quantity of liquid or solution. A concentrated solution is one that has a large concentration of the dissolved solute. If there is only a small amount of dissolved solute in the solution, it is said to be dilute.

In chemistry, a solution's concentration refers to the proportion of a solute that is present in a given amount of solvent or solution. Understanding the solute concentration is necessary for controlling the stoichiometry of reactants in solution reactions.

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The complete question is -

A student uses visible spectrophotometry to determine the concentration of CoCl₂ (aq) in a sample solution. First the student prepares a set of CoCl₂ ( aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.

The student made the standard curve above. Which of the following most likely caused the error in the point the student plotted at 0.050 M Co²⁺(aq)?

A-There was distilled water in the cuvette when the student put the standard solution in it.

B-There were a few drops of the 0.100 M Co²⁺(aq) standard solution in the cuvette when the student put the 0.050 M standard solution in it.

C-The student used a cuvette with a longer path length than the cuvette used for the other standard solutions.

D-The student did not run a blank between the 0.050 M Co²⁺(aq) solution and the one before it.

The relationship among force, mass, and acceleration is force equals mass times acceleration. Therefore, option B is correct.

The term acceleration is defined as the rate of change of velocity. When an object moves in a circular path at a constant speed, it is still accelerating because its velocity direction changes.

The application of a net force to an object alters its motion, the greater the net force, the greater the acceleration. More massive objects necessitate greater net forces to accelerate at the same rate as less massive objects.

“Force equals mass times acceleration.” This is because this shows the equation for force, and thus it shows the relationship between them in how they are used.

Thus, option B is correct.

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Oxygen is used in the production of raw copper because it is a catalyst for the reaction that turns alumina into pure copper.

Alumina is an ore, and it is a refractory metal. Alumina has three components: aluminum oxide (Al2O3), silica (SiO2), and water. When this ore is heated, the aluminum oxide breaks down into smaller pieces of aluminum and oxygen gas.

When this process happens, these gases react with each other to produce pure oxygen gas. The reaction between the gases also produces heat, which causes more alumina to break down from its original form.

The oxygen produced by this reaction can be used as a catalyst for turning alumina into pure copper at high temperatures.

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One career in which it would be important for people to understand the gas laws is chemist.

A chemist is a person who specializes in the science of chemistry, especially at a professional level.

The gas laws are an integral component of chemistry as a subject or course of study. The fundamental gas laws in chemistry are as follows;

These laws explain the interaction of an ideal gas, which is a gas whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.

Therefore, being a chemist as a career path means understanding the gas laws.

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French toast (the breakfast food) would be an example of molecule because of chemical change.

A molecule is the smallest unit of a material that keeps its content and properties. It is composed of two or more atoms that are joined together by chemical bonds. Chemistry is built upon molecules. The element symbol and a subscript indicating the number many atoms are used to identify molecules.

Atoms interact with each other and with their nuclei when they are close to one another. A molecule is created whenever two or more atoms combine in a way that lowers the state's overall energy.

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The equilibrium concentrations of A, B, and C at equilibrium are:

The equilibrium concentrations of A, B, and C are calculated from the equilibrium equation below as follows:

Kc = [C]⁴ /  [A]³ * [B]²  -----(1)

Kc = 1.33 * 10

The initial concentrations of A and B are as follows:

A = 1.80 mol / 1 L = 1.8 M

B = 3.50 mol / 1 L = 3.50 M

The concentrations at equilibrium are given by the ICE table below:

   3 A (g)   +    2 B (g) ⇄ 4 C (g)

I   1.80            3.50           0

C  - 3x           - 2x           + 4x

E  1.80 - 3x   3.50 - 2x    4x

Substituting the concentrations at equilibrium into the equilibrium equation above

1.33 * 10³¹  = 4x⁴ / (1.80 - 3x)³ * (3.50 - 2x)²

x = 0.56

Therefore;

the concentration of A = 1.80 - 3 * 0.56

the concentration of A = 0.12 M

the concentration of B = 3.50 - 2 * 0.56

the concentration of B = 2.38 M

the concentration of C = 4 × 0.56

the concentration of C = 2.24 M

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The brain does not return to normal as soon as someone stops taking drugs because brain receptors become overwhelmed. Dopamine synthesis is reduced or dopamine receptors are eliminated in the brain.

Endorphins, which are natural opioids produced by your body, are used to block pain signals.

Peripheral/nociceptive pain is associated with injuries that harm your skin and muscles, such as pinpricks and stove burns.

Pain fibers detect these wounds and transmit the signal to the neurons in your spine and brain, the two structures that make up your central nervous system.

Your pain fibers and central nervous system normally cooperate in a condition. Your brain says "ow" and instructs your body how to respond when someone punches you. Release of stress-relieving chemicals. Your immune system combats the swelling in your injured arm.

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Answer:

6.022 X 1023 atoms

Explanation:

Answer:

Yes, soap solution is acidic. You verify its acidity by using a red litmus paper.

Explanation:

The soap is a weakly acidic. To verify that the soap solution is acidic, put a drop of soap solution on a red litmus paper, color change will be observed and the red litmus paper will turn into blue. This gives us the evidence that soaps are acidic.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge.  The correct option is option C

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.

As it is given that lithium atom is neutral for this number of proton has to be equal to number of electron. The  proton number is 3 that means number of electron is also 3 because proton number  is equal to number of electron and this equals to atomic number.

Therefore there are three electrons in Lithium if it has three proton. The correct option is option C

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To transfer heat in radiation electromagnetic waves must be transmitted.

Heat transfer occurs through conduction, convection and radiation.

Conduction requires direct physical contact whereas in convection the particles must circulate and move in a liquid or gas. Both of the transfer heat only in the presence of air.

Radiation is a type of heat transfer that occurs everywhere through electromagnetic waves. In radiation, electromagnetic waves must be transmitted for the transfer of heat. It happens even in vacuum.

Every object radiates thermal energy. Even humans radiate heat at all times. It does not have to move from cold to hot objects.

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The concentration of the methylamine chloride is 0.0000013 M.

We know that the concentration has to do with the amount of the substance that is present. Hence, the question is essentially trying to ask us to be able to find the  the concentration of methylamine chloride in the solution.

[H^+] = Antilog(-0.20) = 0.63 M

Ka = 1 * 10^-14/4.6*10^-4 = 2.22 * 10^-11

Let us first set up the ICE table as shown below;

            CH3NH2(aq)    +  H^+  ⇄  CH3NH3^+(aq)   + OH^-(aq)

I               0.15                   0.63         0                         0                      

C              -x                      -x              +x                        +x

E         0.15 - x                0.63 -x        x                          x

Ka = [CH3NH3^+] [OH^-]/[CH3NH2] [H^+]

2.22 * 10^-11= x^2/[0.15 - x] [0.63 -x ]

2.22 * 10^-11(0.09 -0.15x - 0.63x + x^2) = x^2

2.22 * 10^-11(0.09 - 0.48x +x^2) = x^2

1.9 * 10^-12 - 1.1 * 10^-11x + 2.22 * 10^-11x^2 = x^2

x^2 - 2.22 * 10^-11x^2 +  1.1 * 10^-11x  - 1.9 * 10^-12  = 0

x^2 +  1.1 * 10^-11x  - 1.9 * 10^-12  = 0

x =0.0000013 M

Concentration of the methylamine chloride = 0.0000013 M

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The balanced chemical equation for the neutralization reaction is Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O.

A balanced chemical reaction is defined as the equation in which the number of atoms in each reaction remains the same on both sides like on the product side and the reactant side. In a balanced chemical equation, the mass, as well as the change, remains the same in a balanced chemical equation.

A neutralization reaction is a reaction in which the acid reacts quantitatively with a base to form salt and as well as water is known as neutralization reaction. In a neutralization reaction, there is a combination of H+ ions and OH– ions that form water.

The balanced chemical equation for the given value of the neutralization reaction is given below.

 Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O, the equation is balanced.

So we can conclude that  Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O is the balanced reaction.

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One foot equals 60 feet per minute if the conversion factor is 60. The 528ft/min will be 8.8ft/sec.

One foot equals 60 feet per minute if the  is 60.

To convert speed to miles per hour, multiply the speed in feet per second by 0.681818. You could, for example, convert 5 feet per second to miles per hour using the method shown above. Miles per hour and feet per second are used to measure speed. Continue reading to learn more about each unit of measurement.

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