Which compound is an ester? A) CH3OH B) CH3COOH C) CH3OCH3 D) CH3COOCH3

ΔH for the neutralization of 1 mol of H+ by 1 mol of OH- is approximately 0.005 kJ.

(a) To calculate the calories of heat liberated by the combustion of isobutane, we can use the formula:

\(q = m * C * ΔT\)

where:
q = heat energy (calories)
m = mass of substance (in this case, isobutane) = 0.100 mol
C = heat capacity of the calorimeter = 97.1 ∘C kJ
ΔT = change in temperature = 27.965 ∘C - 25.000 ∘C

Plugging in the values, we get:

\(q = 0.100 mol * 97.1 ∘C kJ * (27.965 ∘C - 25.000 ∘C)\)
\(q = 0.100 mol * 97.1 ∘C kJ * 2.965 ∘C\)
q = 29.06965 cal

Therefore, approximately 29.07 calories of heat were liberated by the combustion of isobutane.

(b) To calculate ΔE for the reaction expressed in mol kJ C4H10, we can use the formula:

\(ΔE = q / n\)

where:
ΔE = change in energy (mol kJ C4H10)
q = heat energy (calories) = 29.07 cal
n = number of moles of isobutane = 0.100 mol

Converting calories to joules, we get:

\(ΔE = (29.07 cal) * (4.184 J/cal) / (1000 J/kJ) / (0.100 mol)\)
ΔE = 0.1219712 mol kJ C4H10

Therefore, ΔE for the reaction expressed in mol kJ C4H10 is approximately 0.122 mol kJ C4H10.

5.) To calculate ΔH in kJ for the neutralization of 1 mol of H+ by 1 mol of OH-, we can use the formula:

\(ΔH = q / (n(H+) + n(OH-))\)
where:
ΔH = change in enthalpy (kJ)
q = heat energy (J)
n(H+) = number of moles of H+ = 1 mol
n(OH-) = number of moles of OH- = 1 mol

First, we need to calculate the heat energy (q) using the formula:

\(q = m * C * ΔT\)

where:
m = mass of the solution

= volume * concentration

= (200 mL + 200 mL) * (0.431 M + 0.862 M) = 0.3608 moles
C = specific heat of the solution = 4.184 g ∘C J
ΔT = change in temperature = 26.3 ∘C - 20.5 ∘C

Plugging in the values, we get:

q = 0.3608 moles * 4.184 g ∘C J * (26.3 ∘C - 20.5 ∘C)
q = 0.3608 moles * 4.184 g ∘C J * 5.8 ∘C
q = 9.6490784 J

Converting joules to kilojoules, we get:

q = 9.6490784 J / (1000 J/kJ)
q = 0.0096490784 kJ

Finally, plugging the values into the formula for ΔH, we get:

ΔH = 0.0096490784 kJ / (1 mol + 1 mol)
ΔH = 0.0048245392 kJ

Therefore, ΔH for the neutralization of 1 mol of H+ by 1 mol of OH- is approximately 0.005 kJ.

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Hubless cast-iron piping shall be supported every other joint, unless over six feet in length, then it shall be provided with support at every joint.

According to the 2021 edition of the International Plumbing Code (IPC), Hubless cast-iron piping shall be supported every other joint unless the length exceeds 10 feet. In that case, it shall be provided with support at every joint. It's important to note that plumbing codes and regulations can vary by jurisdiction, so it's always best to consult the specific plumbing code applicable to your location for accurate and up-to-date information.

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There is different types of bonding in different compounds. The type of bonds can be decided from its structure and behavior.

Ionic bond

Ionic bond are also called as electrovalent bond it is a type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Ionic bond is formed when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Covalent bond

Covalent bond is defined as the interatomic linkage that results from the sharing of an electron pair between two atoms. The bonding arises from the electrostatic attraction of their nuclei for the same electrons.

a) CsF have ionic bonding.

b) N₂ have covalent bonding.

c) Na₂S have ionic bonding.

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Answer:

True.

Explanation:

According to this, an object's rate of change in velocity is directly proportional to the force used and moves in the direction of the applied force. The following formula encapsulates it: force (N) = mass (kg) x acceleration (m/s2). A constant mass item will therefore accelerate in direct proportion to the force exerted.

Answer:

true, I am pretty sure it's true

The maximum mass of carbon dioxide, CO₂ produced from the reaction between 3.45 g of hexane and 7.2 g of oxygen is 6.3 g

We'll begin by obtaining the limiting reactant. This is illustrated below

2C₆H₁₄ + 19O₂ -> 12CO₂ + 14H₂O

From the balanced equation above,

172 g of C₆H₁₄ reacted reacted with 608 g of O₂

Therefore,

3.45 g of C₆H₁₄ will react with = (3.45 × 608) / 172 = 12.20 g of O₂

We can see that a higher mass of O₂ is needed to react completely with 3.45 g of C₆H₁₄.

Thus, the limiting reactant is O₂

Finally, we shall determine the maximum mass of carbon dioxide, CO₂ produced from the reaction. Details below:

From the balanced equation above,

608 g of O₂ reacted to produce 528 g of CO₂

Therefore,

7.2 g of O₂ will react to produce = (7.2 × 528) / 608 = 6.3 g of CO₂

Thus, the maximum mass of CO₂ obtained is 6.3 g

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Physical changes only change the state of substance not it's chemical composition.

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.

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Your question is incomplete , but most probably your full question was,how does physical changes work?

Answer:

Scientists must look in their experiment/data to check for accuracy because they don't want to make any mistakes, and most importantly have to make sure they have the right information to proceed.

Explanation:

^

Answer:

Properties of elements repeat in predictable patterns.

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

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CuSO4 is Copper Sulphate.

The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 915 torr

The pressure in the burette can be obtained by using the following formula:

Pressure of gas = Atmospheric presure + pressure due to height

With the above formula, we can determine the pressure in the burette. This is illustrated below:

Pressure in burette = Atmospheric presure + pressure due to height

Pressure in burette = 765.0 + 150

Pressure in burette = 915 torr

Thus, the pressure in burette is 915 torr

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Answer:

A

Explanation:

........................

Answer:

push or pull i think..okay?

Answer:

The answer is C

Explanation:

hope this helps

:)

Answer:

C. Seven colors of the rainbow

Explanation:

when light enters a water droplet and then leaves it again, each different wavelength of light refracts at a slightly different angle. then, when the light is broken up, you can see all of the colors of the rainbow.

For Example, A Dark Tinted Window.

Answer:

Answer:

Potassium : 39.0983u

Sodium : 22.989769u

Neon : 20.1797u

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons

Hope this helps!

Algae blooms are most often caused by eutrophication.

Algae blooms are are dense layers of tiny green plants that occur on the surface of lakes and other bodies of water when there is an overabundance of nutrients (primarily phosphorus) on which algae depend.

Algae species tend to proliferate in growth (bloom) in the presence of abundance nutrients. This abundance of nutrients is as a result of a process called eutrophication.

Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

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Answer:

OB heat

Explanation:

Hope this helps

The Lone pairs present in trigonal bipyramidal electron pair geometry always occupies equatorial position.

In the trigonal bipyramidal electron pair geometry, the electrons which do not forms Bond with any other atom are called lone pair of electron.

These lone pair of electrons generally goes to the equatorial position of the geometry.

They do so because the equatorial geometry provides them the maximum stability as we know that The Lone pair-lone pair repulsion is more than the bond-pair Bond pair repulsion.

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Answer:

Explanation:

% yields =  experimental yields / theoretical yields )x 100%

              =( 302 ÷ 320 )x 100% = 94.4 %

% error = 100% - 94.37% 5.64%

or u can use this law :

% error =(theoretical  value - experimental value )/ theoretical value) x 100%

              ( 320 - 302 )/ 320 ) x 100% = 5.64%

Answer:

B

Explanation:

reaction order is simply the sum of orders for each reactant.

The rate of a reaction is calculated using the concentrations of reactants and is denoted as option B.

This is a type of relationship which depicts comparison of reaction rates with the reactant concentrations.

This is because the reactants are the ones involved in a chemical reaction to form products.

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Answer:

Explanation:

A

The mass of the water vapor is 13.73 g.

The law of conservation of mass is a fundamental principle in physics and chemistry that states that the total mass of a closed system remains constant during a chemical reaction or physical change. This means that the mass of the reactants in a chemical reaction must equal the mass of the products that are formed.

In other words, the mass of the products that are formed in a chemical reaction cannot be created or destroyed, but only converted from one form to another.

Knowing that;

Total mass of the reactants = Total mass of the products

5 + 10 = 1.27 + x

x is the amount of the water vapor

x = 15 - 1.27

= 13.73 g

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The balanced equation would be \(16Cr(s) + 3S_8(s) --- > 8Cr_2S_3 (s)\).

A balanced chemical equation will have as many atoms of different elements in the products as in the reactants. In other words, a balanced chemical equation will obey the law of conservation of atoms.

According to the law of conservation of atoms, atoms can neither be created nor destroyed but can be converted from one form to another during the course of chemical reactions.

Following this law, the balanced equation for the reaction would be \(16Cr(s) + 3S_8(s) --- > 8Cr_2S_3 (s)\)

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Answer:

b. 760 g

Explanation:

The mass of the solution = 800 g

5% of NaCl by mass of the solution can be determined as follows;

    5% of 800  =  \(\frac{5}{100}\) × 800

                       = 5 × 8

                       = 40 g

The mass of NaCl in the solution is 40 g.

The mass of water = mass of solution - mass of NaCl

                               = 800 - 40

                              = 760 g

Therefore, the mass of water required is 760 g.

A 67.0 ml portion of a 1.30 m solution is diluted to a total volume of 238 ml. a 119 ml portion of that solution is diluted by adding 189 ml of water.  The final concentration is  0.2304 M

Concentration is calculated by dividing a constituent's abundance by the combination as a whole. The qualities of mass awareness, molar awareness, amount attention, and volume focus can all be found in exceptional mathematical formulations.

M₁V₁=M₂V₂ where M is concentration and V is volume

M₁ =1.30 M

V₁ = 67 ml = 0.067 L

M₂ = ?

V₂ = 238 ml = 0.238 L

M₁V₁=M₂V₂

M₂ = M₁V₁ / V₂

   = 1.30 × 0.067 / 0.238

   = 0.3659 M

New volume V₁ = 119 ml = 0.119 L

                   V₂ = 0.189 L

M₁  = 0.3659 M

M₂ =  M₁V₁ / V₂

   = 0.3659 ×0.119 /0.189

    = 0.2304 M

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Answer:

As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return back to the gas phase. As a result, the solubility of a gas decreases as the temperature increases.

Explanation:

Answer: lithosphere

Explanation:

continents are a part of lithosphere.

core is a structure of earth

The reactivity of a substance with oxygen is a chemical, not a physical property. The reason it is called a chemical property is that it relies on its electron configuration to determine how it behaves around other substances.

A chemical property is a property of any material that becomes apparent during or after a chemical reaction; that is, any quality that can only be determined by changing the chemical properties of a substance.

Oxygen is a very reactive element, is highly paramagnetic and readily combines with other elements. One of the most important chemical properties of oxygen is that it promotes combustion. Even at room temperature, oxygen binds to elements and forms e.g. rust.

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Based on the energy usage shown by the graph, the best option for the chemical change represented is the combustion of iron.

The combustion of iron in oxygen leads to the formation of Iron (III) oxide in solid form.

For the combustion of iron to happen, a lot of heat has to be applied to the iron which is why the potential energy of reactants is high. As the reaction progresses, the energy needed reduces as iron (III) oxide is formed.

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