how much heat energy is absorbed when 7 moles of water boils according to the reaction below

Answer:

See attachment for graph.

The function is not continuous.

Step-by-step explanation:

Piecewise functions have multiple pieces of curves/lines where each piece corresponds to its definition over an interval.

Given piecewise function:

\begin{gathered}f(x)=\begin{cases} x-3 \;\;\;\;\: \text{if}\;\;\;x \leq -2\\4x+5 \;\;\; \text{if}\;\; \;x > -2 \end{cases}\end{gathered}

f(x)={

x−3ifx≤−2

4x+5ifx>−2

Therefore, the function has two definitions:

f(x) = x - 3 when x is less than or equal to -2.

f(x) = 4x + 5 when x is greater than -2.

When graphing piecewise functions:

Use an open circle where the value of x is not included in the interval.

Use a closed circle where the value of x is included in the interval.

Use an arrow to show that the function continues indefinitely.

First piece of the function

Substitute x = -2 into the first function:

\implies f(-2)=-2-3=-5⟹f(−2)=−2−3=−5

As the interval for the first equation is x ≤ -2, it includes the value of x = -2. Therefore, place a closed circle at point (-2, -5).

To help graph the line, find another point on the line by inputting another value of x that is less than -2 into the same function:

\implies f(-5)=-5-3=-8⟹f(−5)=−5−3=−8

Plot point (-5, -8) and draw a straight line from the closed circle at (-2, -5) through (-5, -8). Add an arrow at the other endpoint to show it continues indefinitely as x → -∞.

Second piece of the function

Substitute x = -2 into the second function:

\implies f(-2)=4(-2)+5=-3⟹f(−2)=4(−2)+5=−3

As the interval for the second equation is x > -2, it does not include the value of x = -2. Therefore, place an open circle at point (-2, -3).

To help graph the line, find another point on the line by inputting another value of x that is more than -2 into the same function:

\implies f(1)=4(1)+5=9⟹f(1)=4(1)+5=9

Plot point (1, 9) and draw a straight line from the open circle at (-2, -3) through (1, 9). Add an arrow at the other endpoint to show it continues indefinitely as x → ∞.

See attachment for the graph.

\begin{gathered}\boxed{\begin{minipage}{8cm}\underline{Determining if a function is continuous at $x=a$}\\\\Condition 1: $f(a)$ exists\\\\Condition 2: $\displaystyle \lim_{x \to a}f(x)$ exists at $x=a$\\\\Condition 3: $\displaystyle \lim_{x \to a}f(x)=f(a)$\\\end{minipage}}\end{gathered}

If all three conditions are satisfied, the function is continuous at x = a.

If any one of the conditions is not satisfied, the function is not continuous at x = a.

To determine whether or not the given piecewise function is continuous, find if the function is continuous at x = -2.

Condition 1

Does f(-2) exist? Yes → f(-2) = -5

Condition 2

\textsf{Does}\;\;\displaystyle \lim_{x \to -2} f(x)\;\; \sf exist\;at\;\;x=-2?Does

x→−2

lim

f(x)existatx=−2?

To the left of x =- 2, f(x) = x - 3

To the right of x = -2 , f(x) = 4x + 5

Evaluate the left and right limits as x approaches -2:

\displaystyle \lim_{x \to -2^-}f(x)=\lim_{x \to -2^-} -2-3=-5

x→−2

−

lim

f(x)=

x→−2

−

lim

−2−3=−5

\displaystyle \lim_{x \to -2^+}f(x)=\lim_{x \to -2^+} 4(-2)+5=-3

x→−2

+

lim

f(x)=

x→−2

+

lim

4(−2)+5=−3

\textsf{As}\;\;\displaystyle \lim_{x \to -2^-} f(x) \neq \lim_{x \to -2^+} f(x), \;\; \lim_{x \to -2} f(x)\;\; \textsf{does not exist}.As

x→−2

−

lim

f(x)



=

x→−2

+

lim

f(x),

x→−2

lim

f(x)does not exist.

As condition 2 fails, there is no need to proceed to condition 3.

Therefore, the function is not continuous.

The mass of [tex]NO_2[/tex], in grams, that would be produced by the reaction will be 118.68 grams.

First, let's write out the balanced equation of the reaction:

[tex]4NH_3 (g) +7O_2 (g) -- > 4NO_2 (g) + 6H_2O(g)[/tex]

From the equation, the mole ratio of [tex]NH_3[/tex] and [tex]NO_2[/tex] is 1:1.

Recall that, mole = mass/molar mass.

43.9 g of [tex]NH_3[/tex] = 43.9/17.03

                        = 2.58 mol

Thus, from the 1:1 mole ratio, the equivalent mole of  [tex]NO_2[/tex] produced from the reaction would be 2.58 mol.

Since, mass = mole x molar mass, the mass of 2.58 mol of  [tex]NO_2[/tex] can be calculated as:

2.58 x 46.0 = 118.68 grams.

In other words, the amount of  [tex]NO_2[/tex] produced by the reaction of 43.9 g of [tex]NH_3[/tex] according to the chemical equation would be 118.68 grams.

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The Description of Rocks are given below

Conglomerate: Conglomerate is a type of sedimentary rock that is made up of large, rounded particles. It is typically formed in high-energy environments, such as riverbeds or at the base of cliffs. The rounded particles in conglomerate are usually made up of a variety of rocks and minerals, and they can range in size from pebbles to boulders.

Ammonite: Ammonite is the fossilized shell of an extinct marine animal called an ammonoid. These animals were closely related to modern-day squid and octopuses, and they lived during the time of the dinosaurs. Ammonite fossils are commonly found in sedimentary rock, and they are often used to help determine the age of the rock layer in which they are found.

Crinoid: Crinoids are a type of invertebrate animal that lived in the ocean during the Paleozoic and Mesozoic eras. They had a stem and a head, and their body was made up of a series of segmented plates. Crinoid fossils are commonly found in sedimentary rock, and they are often used to help determine the age of the rock layer in which they are found.

Trilobite: Trilobites were a group of extinct arthropods that lived in the ocean during the Paleozoic era. They had a hard exoskeleton and were segmented, with a head, thorax, and tail. Trilobite fossils are commonly found in sedimentary rock, and they are often used to help determine the age of the rock layer in which they are found.

The conglomerate rock layer is the youngest and the trilobite rock layer is the oldest.

The ammonite and crinoid rock layers are somewhere in between in terms of age. The description of the rocks in the table refers to the types of fossils that are found in each rock layer.

For example, the conglomerate rock layer contains rocks that are composed of large, rounded particles, while the trilobite rock layer contains rocks with trilobite fossils.

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The number of chloride ions (Cl-) in 250 mL of a 0.2M magnesium chloride solution is 0.16.

Option B is correct.

The first step to take is  figure out how many moles of magnesium chloride were needed to make this solution.

We use the compound's molar mass, which essentially tells us the mass of one mole of magnesium chloride which is 0.01996 moles MgCl2

Each mole of magnesium chloride will produce  2 moles of chloride anions in solution.

0.01996 x 2 moles Cl− = 0.03992 moles of Cl−

Therefore the number of chloride ions (Cl-) in 250 mL of a 0.2M magnesium chloride solution is 0.03992/ 250 ml

=0.16 moles of Cl

molarity tells us the number of moles of solute you get per liter of solution, we can conclude that the molarity of the chloride anions will be 0.16

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Answer:

This process is called mass spectrometry. In mass spectrometry, a sample is ionized, typically by bombarding it with high-energy electrons, and the resulting ions are separated based on their mass-to-charge ratio. The mass of the ions can be measured using a mass spectrometer, and this allows the determination of the atomic masses of the elements present in the sample. To obtain accurate results, it is generally necessary to measure the masses of a large number of atoms, as the precision of the measurement increases with the number of atoms that are measured

Explanation:

Answer:C it is C

Explanation:

Answer:

9.990,123578

Explanation:

0.659248-+780

Answer:

41800 j/g

Explanation:

Your welcome

The molar mass is 176.1 g/mol , and Ka for vitamin C is  1.03 x 10⁻⁴

The equation for the reaction is as shown in the attached diagram below

the reaction of Sodium Hydroxide, NaOH with ascorbic acid, C₆H₈O₆ is similar to the reaction of Potassium Hydroxide, KOH with ascorbic acid as show

C₆H₈O₆  +  KOH     ⇒     C₆H₇O₅K    +   H₂O

to produce one mole of potassium ascorbate and water

now,

0.1103 M KOH is contained in 1000mL

x moles is contained in 20mL

cross multiply making x the subject

No of moles of KOH = (0.1103 x 28.42)/1000 = 0.003135 moles

or

Moles of KOH = 0.1103 x 0.02842 L = 0.003135  = moles ascorbic acid

Molar mass = 0.552 g / 0.003135 mol = 176.1 g/mol

Moles of ascorbic acid = 0.552 / 176.1 =0.00313

moles NaOH = 0.0100 L x 0.1103 =0.001103

C₆H₈O₆ + OH⁻ >> C₆H₇O₆⁻ + H2O

Moles ascorbic acid in excess = 0.00313 - 0.001103 = 0.002027

Moles C₆H₇O₆⁻ = 0.001103

total volume = 20 + 10 = 30 mL = 0.030 L

concentration ascorbic acid = 0.002027 / 0.030 =0.0676 M

concentration C₆H₇O₆⁻ = 0.001103 / 0.030 =0.0368 M

pH = pKa + log [C₆H₇O₆⁻] / [C₆H₈O₆]

3.72 = pKa + log 0.0368 / 0.0676

3.72 = pKa - 0.264

pKa =3.984

Ka = 10^-3.984

=1.03 x 10⁻⁴

Your question is incomplete most probably your full question was

A 0.552-g sample of ascorbic acid was dissolved in water to a total volume of 0.20 mL and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 mL. The pH of the solution at 10.0mL of added base was 3.72. From this data, determine the molar rmass and Ka for vitamin C.

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The statement that best describes how the radioactivity was distributed in one of the first molecules of Protein X that was completely translated is B. Radioactive amino acids were located only at one end of the molecule.

Protein X was one of the first molecules to be completely translated, and the distribution of its radioactivity was unique. Radioactive amino acids were not dispersed throughout the molecule, but instead were located only at one end of the molecule.

This means that the statement B best describes how the radioactivity was distributed in one of the first molecules of Protein X that was completely translated.

With this knowledge, we can be sure that the radioactivity was not evenly distributed throughout the molecule, but was instead concentrated at one end.

This information provides us with a better understanding of the structure of Protein X, and how it is different from other molecules.

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Answer:

Explanation:

Ultra-high temp pasteurized milk.

S waves have a frequency of 2.5Hz, a wavelength of 600 m, and an average speed of 2.5 × 600 = 1500.

Wave speed is the amount of space a wave covers in a certain length of time, such as how many metres it covers in a second. Speed = Wavelength x Frequency is the formula that links wave speed to wavelength and wave frequency. When wavelength and frequency are known, one may use this equation to determine the wave speed.

Frequency equals 600 Hz. Given that the sound speed in air is 340 m/s, the wavelength is calculated as wavelength = speed/frequency = 340/600 = 0.57 m. P19. The wavelength is two hurts into the frequency. After solving, we will obtain a lambda of 1.5 metres. Three metres per second is a velocity of v. So the water waves here move at a 3 metre per second rate. The equation linking wave speed, frequency, and wavelength is v=f since the frequency, f, is 1/T.

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Water Alcohol Heat of Vaporization, H (J/g) 2,260 841 vap Heat of Fusion, H, (J/g) 334 109 Specific Heat Capacity of the Liquid, c (J/g•K) 4.18 2.46

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The independent variable is the factor that differs between the experimental and control groups.

In mathematical modeling, statistical modeling, and experimental sciences, dependent and independent variables are variables. Dependent variables are so named because their values are studied in an experiment under the assumption or demand that they are dependent, by some law or rule, on the values of other variables.

It is a variable that is independent of the other variables you are attempting to measure. For example, age could be an independent variable. Other factors (such as what they eat, how often they go to school, and how much television they watch) will not change a person's age.

Thus, The independent variable is the factor that differs between the experimental and control groups.

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The volume in liters of a 2.0 M solution of NaOH that can be made using 500.0 g NaOH is 6.25 liters.

The molarity of a solution is the concentration of a solution expressed in moles of solute per given liter of solution.

The molarity of a solution is given mathematically as follows:

The volume in liters of a 2.0 M solution of NaOH that can be made using 500.0 g NaOH is calculated below:

Moles of solute = mass/molar mass

Moles of NaOH = 500 / 39.997

Moles of NaOH = 12.5 moles

Volume of solution = 12.5 / 2.0

Vlume of solution = 6.25 liters

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An example of a reduction reaction is: S+2e → S²⁻

In a chemical reaction, when a molecule accepts/gains an electron, it undergoes a reduction reaction.  Conversely, a molecule leaving an electron undergoes an oxidation reaction. A molecule undergoing a reduction reaction forms an anion while cations are formed in an oxidation reaction.

In the question, Magnesium leaves 2 electrons and forms an Mg2+ cation. Similarly, Sodium and Aluminum leaves electron to form their respective cations. All of the mentioned molecules are undergoing oxidation reactions and form cations.

Chemical reactions are primarily red-ox coupled. If one molecular species is getting reduced, another molecular species in the reaction will be oxidized.

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The indicator used for the titration of base  NaOH with a strong acid is o-cresol phthalein and phenolphthalein due to clear colour intensity variation during titration.

When an o-cresolphtahlein indicator is mixed with the basic solution gives the light red colour to dark red with increased pH values. similarly, phenolphthalein gives reddish-orange colour. Titration is a technique used to evaluate an unknown substance concentration in a solution. It entails adding a known concentration of a solution, known as the titrant, gradually to a known volume of the object being studied, known as the analyte or titrand. The endpoint of the titration is the point at which the two solutions are chemically balanced. Acid-base titrations involve an acid and a base reacting to produce salt and water. Transferring electrons from one species to another is a component of redox titrations.

Hence, titration is neutralization reaction of acid and bases.

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Oxygen is a molecule that is essential for life. It is a colorless, odorless gas that makes up about 20% of the air we breathe.

A molecule is a group of two or more atoms that are held together by chemical bonds. They are the basic building blocks of all matter, and are composed of protons, neutrons, and electrons.

When oxygen is dissolved in water, it can be absorbed by aquatic organisms such as fish. These aquatic organisms use the oxygen to help them with their metabolic processes. When the levels of oxygen in the water are too low, the organisms are not able to survive and may die. Low oxygen levels can occur naturally due to environmental factors like temperature or seasonality, or they can be caused by human activities such as pollution. It is important to keep oxygen levels in the water high to ensure the health of aquatic ecosystems.

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The nuclear decays that are alpha decays are given below:

Nuclear reactions are reactions that involve changes in the nuclear particles of an atom of an element.

A type of radioactive decay known as "alpha decay" occurs when an atomic nucleus emits an alpha particle as it changes or decays into a new atomic nucleus. Here, the freshly produced atom's atomic mass number will decrease by four, and its atomic number will decrease by two.

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Answer:

The third option

Explanation:

This reaction is a single replacement reaction because K replaced Mg and a redox reaction because the ion charges of the elements changed from a 0 charge on K to +1 charge, and a +2 charge on Mg to a 0 charge.

Equivalence point is dependent on stoichiometry of balanced reaction of acid and base. Stoichiometry only considers number of mols involved, not strength of reactants involved.

To ascertain how much of a specific drug is present in a sample, an experiment called a b is done. A diprotic acid is one that has a two-proton (H+) capacity per molecule. Two equivalence points—points at which the number of moles of acid and base are equal—are present when a diprotic acid is titrated with NaOH. When all of the acids have been neutralised, the first equivalence point is reached; meanwhile, the second equivalence point is reached when the surplus base has been neutralised. The amount of NaOH solution required to go from the first equivalence point to the second equivalence point is twice the amount required to travel from the first equivalence point to the first equivalence point.

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According to the given statement the percentage atom economy for the reaction to produce nickel is 67.8% .

A new substance is produced as a result of a chemical reaction in which bonds between the molecules of the products and reactants are broken but new bonds are formed. Simply put, a chemical equation is an mathematical statement that describes how reactants lead to products.

Total Mr = 75+12=87

Step 2:

In this scenario, the valuable product is nickel. Find the total Mr of that product:

Total Mr = 59

Step 3 :

Mr of useable product divided by Mr of all reactants equals the percentage of atom economy.

=(59/87)x100

= 67.8% .

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The energy that is taken in by the reaction is; 334 kJ as shown in the calculation below.

We have to have it at the back of our minds that if we are dealing with a chemical change that can also be called a chemical reaction that we are definitely going to have cases in which the energy could be absorbed or evolved in the system.

If the energy of the system is absorbed then we can say that the system is an endothermic system and there is a gain of energy in the system and if there is a loss of energy we would see that the system would heat up.

We can use the stoichiometry of the reaction to see that the energy that has been shown here is for one mole of the reactants. When we have 2 moles of the reactants we would have;

The energy released by one mole = 167 kJ

The energy released by two moles is therefore obtained from;

2 ( 167 kJ) = 334 kJ

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Answer:

324 kJ

Explanation:

162 kilajoules react with 1 mole of ba(OH)2

we have 2 moles of ba(OH)2 that we're trying to find the number of reactant kilajoules for.

162 x 2 = 324

Sugar water is a homogeneous mixture. Therefore, option A is correct.

A mixture can be described as made up of two or more different substances which are physically combined in a mixture. A mixture of two or more substances can break down into their original components.

The composition of a heterogeneous mixture can not be uniform entire the mixture while the composition of a homogeneous mixture can be always the same.

Pure substances cannot be broken down into simple substances that have only one kind of atom in the entire composition.

A pure substance can be described as made up of two or more elements that are chemically combined together and has a set composition such type of pure substance is called a compound.

As the sugar completely dissolved in water so it is a homogeneous mixture.

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Your question is incomplete, the complete question was,

Which of the following is a homogeneous mixture

A ) sugar solution

B) Mud

C) dirt

D) salsa

A reaction has an enthalpy change of +14 kJ mol-¹ entropy change of +37 J K-¹ mol-¹. the temperature is 378105.2284°C.

Generally, To determine the temperature at which an endothermic reaction becomes spontaneous, you need to use the entropy change of the reaction and the enthalpy change of the reaction. This can be done using the equation:

ΔG = ΔH - TΔS

Where

If the ΔG for a reaction is negative, then the reaction is spontaneous. If the ΔG for a reaction is positive, then the reaction is not spontaneous.

In this case, we are given that the enthalpy change for the reaction is +14 kJ/mol and the entropy change for the reaction is +37 J/K*mol.

We can use this information to solve for the temperature at which the reaction becomes spontaneous

ΔG = ΔH - TΔS

0 = +14 kJ/mol - T(+37 J/Kmol)

T = 14000 J/mol / (37 J/Kmol*1/1000)

T = 378378.3784 K

Thus, the temperature at which this endothermic reaction becomes spontaneous is approximately 378378.3784 K, which is approximately 378105.2284°C.

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The symbol that represents that of an element is He. Option B.

Elements have their respective symbols in chemistry. For example, hydrogen is represented by H, and helium is represented by He. Carbon is represented by C, oxygen by O, fluorine by F, and nitrogen by N.

Thus, CO is a combination of carbon and oxygen, HF is a combination of hydrogen and fluorine, and NO is a combination of nitrogen and oxygen. They are known as carbon monoxide, hydrogen fluoride, and nitrogen oxide respectively.

In other words, the only symbol that represents that of an element is He which symbolizes helium.

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Alkyne chemistry refers to the branch of chemistry that deals with triple bonds between carbon atoms. Due to the presence of pi-electrons that are not tightly bound, alkynes undergo addition reactions.

Alkynes have a triple bond, which makes it possible to add halogens, water, and other substances to them through an addition reaction. A series of steps are used to create addition goods. The development of addition products is caused by the stability of vinylic cations. Asymmetric alkynes must adhere to Markovnikov's rule in order to conduct addition reaction. Below are a few addition reactions of alkynes that are explained: Alkenes are created when alkynes react with dihydrogen in the presence of catalysts like Pt/Pd/Ni. Alkanes are created when the produced alkenes further react with dihydrogen.

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Answer:

A possible element with ns2np4 valence orbital is Oxygen(O)
A element that has the most electronegativity and soft is flourine(F)
for part C, it is scandium (Sc) with the last electron filled in the 3d orbital

The questions for the reaction between hydraulic acid and magnesium are as follows: depending on the reactant and outcome, is it a combo, decomposition, single replacement, triple replacement, or combustion.

Identification of the by products of component mixing will be aided by the second investigation. Based on the final products created, a reaction can be categorized as synthesis, decomposition, solo replacement, double renewal, or combustion.

will make it easier to determine how temperature affects reaction pace. We may classify a response as exothermic or absorption of heat based on how temperature affects it.

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The molarity of the solution is 0.00016 M

To determine the molarity of a solution, you need to know:

From the information you provided, the concentration of the solution is given in parts per million (ppm). To convert from ppm to molarity, you need to know:

The molecular weight of glucose is 180.16 g/mol. If the solvent is water, the density is about 1 g/mL. Here is the conversion calculation:

1 ppm = 1 mg/L = (1/180.16 g/mol) / (1 g/mL) = 5.55 x 10^-6 mol/L

So, the molarity of the solution is: 2.89 ppm * 5.55 x 10^-6 mol/L/ppm = 1.60 x 10^-4 mol/L = 0.00016 M

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Answer:

Explanation:

Before telling the answer remember some terminology

molarity=No. of moles of solute/Volume of the solution in liters

M=n/V

n=Mass of solute(w)/Molecular mass(M)

V=volume of solution(v)/1000

ppm =(parts per million)

ppm of solute=(mass of solute/mass of solution)*10^{6}

2.89gms of solute in 1000000 of solution

5.22gm of solute

5.22in 1000 gms in litre=5220g[tex]L^{-1}[/tex]

2.89 gms are present in 2.59/5220=5.5363*[tex]10^{-4}[/tex]

Hence the molarity of the solution is 5.5363*[tex]10^{-4}[/tex]mol [tex]L^{-1}[/tex]

The heat that is absorbed by the system is  1363 J. Option B

We know that in a chemical reaction that there could be the absorption or the evolution of heat. We say that there is the evolution of heat when heat has been lost from the system and there is the absorption of heat when heat has been gained by the system.

Number of moles of the barium hydroxide hydrate = 3.15 g/203 g/mol

= 0.015 moles

Number of moles of the ammonium thiocyanate = 1.52/76 g/mol

= 0.02 moles

If 1 mole of barium hydroxide hydrate reacts with 2 moles of  ammonium thiocyanate

0.015 moles of barium hydroxide hydrate reacts with 0.015 * 2 moles/1 mole

= 0.03 moles

Hence the limiting reactant is the ammonium thiocyanate.

Now the heat that is absorbed is;

H = mcdT

m = mass of the water

c = Heat capacity

dT = Temperature change

H = 100 * 4.20 * 3.1

H = 1363 J

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