Why do solids expand on heating?

Surely, when there is a decrease in temperature accompanying a chemical reaction, this indicates that: energy was absorbed.

The correct answer choice is option d.

In happens that in a chemical reaction which leads to the absorption of energy due to decrease in temperature, this results as a result of the fact that bonds in the reactants of the reaction are broken than it is released

So therefore, we can now deduce and confirm from the explanation given above that it is an endothermic reaction when energy is absorbed by the system.

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The explanation of Figures A and B to do or do not show work being done is given below:

He is using energy to lift the books in picture A, which takes both force and motion to do so. In figure B, the books move along with him, and as such only effort is used to carry them. Hence, he is doing work only in Figure A.

The examples are:

The sum of the displacement and the component of the applied force of the object in the displacement direction is the work done by a force. Work is accomplished when we push a block with some force; the body moves more quickly.

Work completed is noted as an object must be subjected to a force and move in the direction of the force in order for work to be done on it.

Therefore, It should be converted to energy in order to move an object. Energy can be transferred by the use of force. This amount of energy that is delivered when a force is used to move an object is known as work that is done.

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Magnesium hydroxide has a limited solubility in water and is a weak base. In 1.8 x 10E-6 M solution, there are two hydroxide ions (OH-) per formula unit, or the following number of hydroxide ions per liter:

2(1.8 x 10E-6) = 3.6 x 10E-6 .

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

Molarity is measured in units of M or mol/L. One molar is used to describe a 1 M solution.

The amount of moles of solute per liter of solution is known as molarity (M).

Molarity is defined as moles of solute per liter of solution. The amount of moles of solute per kilogram of solvent is known as molality (m). Molality is defined as moles of solute/kg of solvent.

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Answer:

Initial volume of the container (V1) = 1.27 L (Approx)

Explanation:

Given:

Number of mol (n1) = 5.67 x 10⁻²

Number of mol (n2) = (5.67 +2.95) x 10⁻² = 8.62 x 10⁻²

New volume (V2) = 1.93 L

Find:

Initial volume of the container (V1)

Computation:

Using Avogadro's law

V1 / n1 = V2 / n2

V1 / 5.67 x 10⁻² = 1.93 / 8.62 x 10⁻²

V1 = 10.9431 / 8.62

Initial volume of the container (V1) = 1.2695

Initial volume of the container (V1) = 1.27 L (Approx)

Answer: 1.27 L

Explanation:

First, calculate the final number of moles of propane (n2) in the container.

n2 = n1 + nadded = 5.67 × 10^−2 mol + 2.95 × 10^−2 mol = 8.62 × 10^−2 mol

Rearrange Avogadro's law to solve for V1.

V1 = V2 × n1 / n2

Substitute the known values of n1, n2, and V2,

V1 = 1.93 L × 5.67 × 10^−2 mol / 8.62 × 10^−2 mol = 1.27 L

The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.

Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.

The general form of a single displacement reaction can be represented as:

\(A + BC \longrightarrow B + AC\)

When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.

\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)

Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.

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The rate of reaction is given by rate = k [CH3COOC2H5] [C4H9OH], where k is the rate constant. From the given data, the forward reaction rate constant, k = 9 x 10-5 dm3 mol-1 s-1. The equilibrium constant, Kc = 1.08.

At equilibrium, the rate of forward reaction equals the rate of backward reaction. So, Kc = [CH3COOC4H9] [C2H5OH] / [CH3COOC2H5] [C4H9OH] At equilibrium, we have [CH3COOC4H9] [C2H5OH] / [CH3COOC2H5] [C4H9OH] = 1.08 ... equation (1)

The plot of the concentration of butanol and butyl acetate as a function of time is given in the following graph: \(y=1.545x^{2}-279.29x+14411\)\(z=400-0.625x\)The unit of y is mol/dm3 and x is seconds. The unit of z is dm3. (b)The maximum concentration of butyl acetate is reached when the concentration of butanol is zero.

Therefore, the total reactor volume to maximize the concentration of butyl acetate and avoid overflowing the vessel is 279 dm3 (approx).

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An H2 molecule only has three unique isotope combinations.

The 3H (or hydrogen-3) isotope is more commonly referred to as tritium than the 2H (or hydrogen-2) isotope. Sometimes, deuterium and tritium are represented by the letters D and T rather than 2H and 3H. Although though this application is widespread, according to the IUPAC, it is not preferred.

Each hydrogen atom in a hydrogen molecule (H2) can either be the 1H isotope (also known as protium) or the 2H isotope (also called deuterium). As a result, each hydrogen atom has two potential isotopes, for a total of 2 2 = 4 possible isotope combinations in an H2 molecule. These four potential pairings are as follows:

Both hydrogen atoms are 1H (H-H)

Both hydrogen atoms are 2H (D-D)

The first hydrogen atom is 1H and the second hydrogen atom is 2H (H-D)

The first hydrogen atom is 2H and the second hydrogen atom is 1H (D-H)

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Answer:

3 moles of carbon, 3 moles of hydrogen and 1 mole of oxygen

Answer:

B. 75.0 kPa

Explanation:

P1V1/T1=P2V2/T2

(x * 100 L)/(300 K)=(100 kPa * 50.0 L)/(200 K)

x=75.0 kPa

Answer:

24rq3r54

Explanation:

3t5q6tq6tq

Answer:

The correct option is;

Group 12

Explanation:

A metallic element that is shiny and silver colored that can exist in the +1 and +2 ionic states and  which forms a bright red compound with sulfur is mercury, Hg

The compound formed between mercury and silver is one of the earliest synthetic compound also known as vermilion and cinnabar. The bright red pigment of the HgS is used widely and is one of the most favorite pigment found in medieval European outstanding works of arts and in Chinese decorated wares made of lacquer as well as in mesoAmerica.

Answer:

12

Explanation:

Answer:1# reactants 2#coefficient

Explanation:

The energy and intermolecular forces involved for liquid solid and gas are as follows:

Intermolecular forces are forces of attraction that exists between the molecules of a substance.

The strength of the intermolecular forces and hence, the kinetic energy vary inversely in molecules of solids, liquids and gases.

The energy and intermolecular forces that are involved for liquid solid and gas are explained below:

In conclusion, intermolecular forces decrease with increase in the kinetic energy of molecules.

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Svante Arrhenius, as a doctoral candidate, proposed the acid-base theory, which initially faced skepticism from his professors who thought his ideas were unfounded. However, within a decade, the Arrhenius theory was widely accepted and praised in the scientific world. In his theory, Arrhenius defined acids as compounds having ionizable hydrogen, and bases as compounds with ionizable hydroxide ions (OH-).

Arrhenius proposed his theory of acids and bases in 1884 as part of his doctoral thesis. At the time, his ideas were met with skepticism and criticism from his professors and peers, who were more accustomed to the older, classical theories of acids and bases.

However, Arrhenius's theory was eventually accepted and became widely praised within the scientific community. This was in part due to the experimental evidence that supported his theory and the way that it could be used to explain a wide range of chemical phenomena.

In Arrhenius's theory, an acid is a substance that dissociates in water to produce hydrogen ions (H+), while a base is a substance that dissociates in water to produce hydroxide ions (OH-). This theory provided a new and more comprehensive understanding of the behavior of acids and bases and laid the foundation for further research in this area.

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yes I agree thank you for sharing

Answer:

Flerovium

Explanation:

Answer:

Fl or flerovium. Atomic number is the number above the element on a periodic table.

The ideal gas law is the state equation of a hypothetical ideal gas. The volume of the nitrogen gas is 51 I.

The general gas equation, commonly known as the ideal gas law, is the state equation of a hypothetical ideal gas. The ideal gas equation is formulated as:

PV = nRT

In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.

As it is given that the pressure on the nitrogen is 720 torr, the temperature of the gas is 20°C(293 k), and the moles of nitrogen are 2.0 moles. Therefore, using the ideal gas equation the volume of the nitrogen can be written as,

\(pv=nRT\\\\v = \dfrac{nRT}{p}\\\\v = \dfrac{2 \times 62.396 \times 293}{720}\\\\v = 50.7834 \approx 51\)

Thus, the volume of the nitrogen gas is 51 I.

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Answer:

answer in picture

Explanation:

There will be twice quite so many OH ions as Ba(OH)2 molecules, with an OH- concentration of 1.5 M near the end.

Barium hydroxide, also known as baryta, has the formula Ba(OH)2. There is no odour to this clear white powder. It is naturally poisonous. It is ionic in nature; for example, in aqueous solution, Ba(OH)2 could provide two hydroxide ions for every molecule.

Given,

[Ba(OH)2] = 0.75 M

To find,

[H⁺] = ?

[OH⁻] = ?

pH = ?

pOH = ?

1. Identify the [H+]

If [H+] equals [Ba(OH)2, then [H+] = 10^13.8 = 1.58 M.

2. Calculate the pOH

pOH = - log[OH]

Substitution

pOH = - log(1.5)

Result

pOH  = 0.17

3.- Calculate the pH

Formula

pH + pOH = 14

Find a solution for pH

pH = 14 - 0.17

Result

pH = 13.8.

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The hydrocarbons in order of the decreasing boiling point is :

Paraffin > Octadecane > Hexane > Neo-hexane > Ethane

The correct option is B.

In the hydrocarbon, the boiling point is directly varies with the length of the carbon chain. If we increasing the number of the carbon atom then the boiling point of the compound will also increases. The Paraffin contains the highest number of the carbon atoms and the ethane is comprised of the  two carbon atoms.

The decreasing order of boiling point of the compound are as follows :

Paraffin > Octadecane > Hexane > Neo-hexane > Ethane

Therefore, the option B is correct.

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Answer:

No it doesn't satisfy the Law of Conservation of Mass.

Explanation:

A balanced chemical equation obeys the law of conservation of mass.

A conjugate base is a substance that is formed when an acid donates a proton to a water molecule. This results in the formation of a negatively charged ion.                                                                                                                                                            

The equation for this reaction can be represented as follows:
HA + H2O → A- + H3O+

In this equation, HA represents the acid, H2O represents the water molecule, A- represents the conjugate base, and H3O+ represents the hydronium ion.
A conjugate acid is a substance that is formed when a base accepts a proton from a water molecule. This results in the formation of a positively charged ion. The equation for this reaction can be represented as follows:

B + H2O → BH+ + OH-
In this equation, B represents the base, H2O represents the water molecule, BH+ represents the conjugate acid, and OH- represents the hydroxide ion.

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Answer:

Explanation: it is true

The value of the b-field required to make the path straight is given by B = E / (ωr).

To determine the value of the magnetic field (b-field), we need to understand the interaction between the electron's motion and the e-field.

When an electron moves perpendicular to a magnetic field (b-field) along a circular path, it experiences a force called the Lorentz force that keeps it in circular motion. This force is given by the equation F = qvB, where q is the charge of the electron, v is its velocity, and B is the magnetic field strength.

When an electric field (e-field) is imposed, it exerts a force on the electron, causing it to move in the direction of the e-field. To make the electron's path straight, the force from the e-field must be equal in magnitude and opposite in direction to the Lorentz force.

Since the electron is moving perpendicular to the b-field, the Lorentz force is given by F = qvB. To make the path straight, the force from the e-field must be equal to F = qE, where E is the electric field strength.

Equating the two forces, qvB = qE, we can cancel out the charge q. Therefore, vB = E.

Since the path is circular, the velocity v is related to the radius r and the angular velocity ω by v = ωr. Substituting this into the equation, we get ωrB = E.

Solving for B, we find B = E / (ωr).

Therefore, the value of the b-field required to make the path straight is given by B = E / (ωr).

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The number of mmols of HBr are in 17.6 ml of 0.0200 M HBr is 0.352 mmol.

The volume of the solution = 17.6 mL = 0.0176 L

The molarity of the solution = 0.0200 M

The expression for the molarity of the solution is as :

The molarity = moles / volume in L

The number of the moles = molarity × volume

The number of moles = 0.0200 × 0.0176

The number of the moles = 0.000352 mol

The number of the moles in mmoles = 0.352 mmol

Thus, the number of moles of HBr is 0.352 mmoles in the 17.6 ml of the 0.0200 M.

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Answer:

time travel swordman magic

The type of glass that has been exposed to high temperatures and shatters into tiny pebble-like fragments when it breaks is called tempered glass.

Tempered glass is a type of safety glass that has been treated with heat and chemicals to make it stronger and more durable than regular glass. When it breaks, it shatters into small, rounded fragments that are less likely to cause injury than the sharp shards produced by regular glass. Tempered glass is commonly used in applications where safety is a concern, such as car windows, shower doors, and storefront windows. It is also used in the construction of buildings, furniture, and appliances.

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Answer:

Explanation:

the compound consists of only two atoms of different elements and is called a  chemical binary compound.

It can be defined as a compound that cannot be broken further and are at its simplest form called a binary compound.

For example, NO2, it is at its simplest form and cannot be broken further, therefore it can be called  chemical binary compound

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Answer:

515.04

Explanation:

After considering all the given options we conclude that the satisfactory option for the given question is the pH has not yet changed, which is option E.

The pH of the solution progressively goes under an alteration when the titrant is added when titrating a weak acid with a strong base. The pH of the solution from the start is acidic because the weak acid dominates it before the equivalence point.

The weak acid is neutralized as the strong base is placed and interacts with it. The weak acid and strong base, however, have identical numbers of moles at the halfway point to the equivalence point, making a buffer system.

The weak acid's (pKa) dissociation constant is used to evaluate the solution's pH at the halfway point. The pH does not vary considerably and stays generally steady due to a buffer forms. Hence, the pH at the halfway point of the titration is the same as the pKa of the weak acid.

Finally, halfway to the equivalence point in a titration curve of a weak acid with a strong base, the pH has not yet changed.

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