N-Phenylsydnone, so-named because it was first studied at the University of Sydney, Australia, behaves like a typical aromatic molecule. Explain, using the Hückel 4n 1 2 rule.

The amount of heat energy (in KJ) needed to convert 3 moles of water vapor into hydrogen gas and oxygen gas is 1450.8 KJ

We'll begin by writing the balanced equation. This is illustrated below:

2H₂ + O₂ --> 2H₂O ΔH = 483.6 KJ

From the balanced equation above,

2 moles of water (H₂O) required 483.6 KJ to produce hydrogen gas and oxygen gas

The heat energy needed to convert 3 moles of water can be obtained as illustrated below:

From the balanced equation above,

2 moles of water (H₂O) required 483.6 KJ to produce hydrogen gas and oxygen gas

Therefore,

3 moles of water (H₂O) will require = 3 × 483.6 = 1450.8 KJ to produce hydrogen gas and oxygen gas

Thus, we can conclude that the energy needed to convert 3 moles of water is 1450.8 KJ

Learn more enthalpy change:

https://brainly.com/question/11967318

#SPJ1

Answer:

solid have distinect shape liquid gas have precious

Answer:

will be 9.7 Liters

Explanation:

Answer:

metallic bonds are defined as those in which metals share valence electrons for example when sodium metallically bonds with itself each atom is sharing the electrons in the third orbital with up to eight other atoms the same thing happens with magnetism or other metals metallically bond to themselves.

Answer:

COMBINATION - - - ✓ -

DECOMPOSITION - - ✓ - -

SINGLE REPLACEMENT ✓ - - - -

DOUBLE REPLACEMENT - - - - ✓

COMBUSTION - ✓ - ✓ -

NEUTRALIZATION - - - - ✓

4.95 is the number of molecules in 500m cube of Oxygen at room temperature and pressure

we have got data

pressure=1atm

temperature=298 k

volume=500 m^3

gas constant, R=8.31

now, by applying ideal gas equation

PV=nRT

1×500=n×8.31×298

n=2476.38/500

n=4.95

It is the lowest part of the material and has chemical elemental properties. Atoms do not independently exist; rather, they combine to form ions and molecules, which then combine to form the material that we can see, feel, and touch.

Molecules are made up of one or more atoms connected by covalent (chemical) connections. Atoms can be visualized as circles with a nucleus in the center (made up of protons and neutrons) and one or more concentric circles around it that indicate the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located, as well as markings that identify the electron. each level

To know more about  molecules visit : https://brainly.com/question/11405437

#SPJ9

84 oz of 2% acid solution and 48-84 = -36 oz of 10% acid solution must be mixed to make 48 oz of a 7% acid solution.

An acid solution is described as a liquid mixture that occurs when hydrogen ions are released when combined with water.

We have that  x oz of 2% acid solution be mixed with (48-x) oz of 10% acid solution.

The total amount of acid in the 2% solution is 2% * x oz = 0.02x oz.

The total amount of acid in the 10% solution is 10% * (48-x) oz = 1 * (48-x) oz.

The total amount of acid in the 48 oz mixture is 0.02x oz + 1 * (48-x) oz = 0.07 * 48 oz = 3.36 oz.

Hence we can calculate that :

0.02x + 1 * (48-x) = 3.36 and solve for x

0.02x + 48 - x = 3.36

0.02x - x + 48 = 3.36

Adding x to both sides:

0.02x + 48 = 3.36 + x

Subtracting x from both sides:

0.02x + 48 - x = 3.36

Dividing both sides by 0.02:

x = 84 oz

Learn more about acidic solutions at: https://brainly.com/question/24255408

#SPJ1

The crystal lattice energy depends not only on the charge of the ions but also on the distance between the ions and the arrangement of the ions in the crystal structure.

Therefore, two ionic solids made of 1/-1 ions can have different crystal lattice energies if the ions have different sizes or if the arrangement of the ions in the crystal is different. A crystal lattice is a three-dimensional arrangement of atoms, ions, or molecules in a crystal that forms a regular repeating pattern. It is a fundamental concept in solid-state physics and chemistry, and understanding the crystal lattice structure of a material is essential for predicting its properties and behavior. The crystal lattice is described by its unit cell, which is the smallest repeating unit of the lattice that can be used to build the entire crystal structure. The crystal lattice energy is the amount of energy required to break the lattice and is influenced by the size and charge of the ions, as well as the arrangement of the ions in the crystal structure. The crystal lattice can also affect the physical properties of a material, such as its melting point, solubility, and conductivity.

Learn more about crystal lattice here:

https://brainly.com/question/30670227

#SPJ4

The molecular formula of a compound with empirical formula of CF₃ and a formula mass of 138g/mol is CF₆.

The molecular formula of a compound can be calculated from the empirical formula as follows:

(Empirical formula)n = formula mass

Where n = coefficient to be multiplied with the empirical formula to make the molecular formula.

The empirical formula of a compound is the notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

{CF₃}n = 138g/mol

{12 + 19(3)}n = 138

69n = 138

n = 2

{CF₃}2 = CF₆

Therefore, the molecular formula of a compound with empirical formula of CF₃ and a formula mass of 138g/mol is CF₆.

Learn more about molecular formula at: https://brainly.com/question/1247523

#SPJ1

Answer:

Answer 'A' is correct

Explanation:

For any reaction to occur, 4 events must occur simultaneously. These are...

1. reacting compounds must be at concentrations that allow them to find on another. Such is concentration dependent and is referred to as Kinetic Feasibility.

2. reacting compounds must collide in very specific orientations for bonding to occur. The reacting compounds have unique molecular geometries such that bonding only occurs if the compounds collide in a required orientation.

3. The reacting compounds must have a natural tendency to react and form chemical bonds.

4. The reacting system must be at sufficient temperature (which delivers sufficient energy (ΔEₐ) such that events 1, 2 and 3 have the highest probability of occurring simultaneously. This occurs at the activation energy point (k = A·e^(-ΔEₐ/RΔT) => lnΔk = lnA - ΔEₐ/RΔT) =>  The Arrhenius Equation of Kinetic Reactivity.

The answer is the half life of phosphorus-32 is of 14 days .

The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.

The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

Mass of atoms initially,

N₀ =2.0 g

Mass after 42 days,

N =0.25 g

mass left undecayed we have,

\(\rm\dfrac{N}{N_{0}} = \dfrac{1}{2^{n}}\)

where  n  is number of half lives occured (the number of times it disintegrated into half of original)

\(\rm\dfrac{0.25}{2} = \dfrac{1}{2^{n}}\)

\(\rm\dfrac{1}{8} = \dfrac{1}{2^{n}}\)

\(\rm\dfrac{1}{2^{3}} = \dfrac{1}{2^{n}}\)

n= 3

number of half lives occured in 42 days is 3

if half life is  \(\rm t_{\frac{1}{2} }\)

then

3* (  \(\rm t_{\frac{1}{2} }\)  )  = 42

\(\rm t_{\frac{1}{2} }\) = 14 days

Therfore the half life of phosphorus-32 is of 14 days .

To know more about Half life

https://brainly.com/question/24710827

#SPJ1

The change that would decrease the strength of the electromagnet is decrease in the number of wire coils.

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

The strength of an electromagnet depends on:

Thus, using fewer loops of wire per meter in the coil, decreasing the current in the wire and removing the iron core will decrease the strength of the magnetic field of an electromagnet.

Learn more about electromagnet here: https://brainly.com/question/12555869

#SPJ1

If you're attempting to synthesize 2 benzyl pentanoic acid from acetoacetic ester, keep in mind that you can do so fairly quickly by following these simplified instructions:

From its pungent free scent to its solid state at temperatures ranging from 118 120°C, acetoacetic ester (better known as ethyl acetoacetate) offers significant value for those working within organic synthesis.

As one of many potent ketones utilized by researchers around the globe its unique properties make it ideal for building complex molecules essential for modern medicine and more.

Learn about acetoacetic ester here https://brainly.com/question/31744037

#SPJ1

The expected observations for the chemical reaction involving lead nitrate and potassium iodide are as follows as per theory.

Before the reaction, you'd have two separate solutions:

Lead Nitrate solution: This is typically a clear, colorless solution.

Potassium Iodide solution: This is also usually a clear, colorless solution.

REACTION OBSERVATIONS:

As soon as you combine these two solutions, a chemical response takes place, resulting in the almost instantaneous development of a yellow precipitate. Lead iodide is a substance that cannot be dissolved in water.

FINAL APPEARANCE:

The final mixture would have a yellow precipitate (lead iodide) suspended in the solution.

The reaction leads to the formation of lead iodide, a substance with distinctive properties, suggesting a chemical change. The presence of this novel compound is indicated by the yellow hue of the precipitate.

Read more about chemical change here:

https://brainly.com/question/1222323
#SPJ1

Metals are the only substances that can interact with silver (Ag) atoms to form metallic bonds. Ag and Cu are the proper responses as a result.

Electrostatic attraction between metal cations and delocalized electrons produces metallic bonds. Many of the physical characteristics of metals, like conductivity and malleability, are explained by the type of metallic bonding that exists.

The only substances with metallic connections between their atoms are metals. While certain elements, such as iron, aluminum, gold, silver, and nickel are frequently referred to as metals, metals also include a range of additional elements.

To know more about metallic bonds visit:-

https://brainly.com/question/29762857

#SPJ1

Answer:

less the number of electrons

Explanation:

electrons have a negative charge

Answer:

1.4×10⁸ g of CaO

Explanation:

We'll begin by converting 250 tonnes to grams (g). This can be obtained as follow:

1 tonne = 1×10⁶ g

Therefore,

250 tonne = 250 × 1×10⁶

250 tonne = 2.5×10⁸ g

Next, the balanced equation for the reaction.

CaCO₃ —> CaO + CO₂

Next, we shall determine the mass of CaCO₃ that decomposed and the mass CaO produced from the balanced equation. This can be obtained as follow:

Molar mass of CaCO₃ = 40 + 12 + (16×3)

= 40 + 12 + 48

= 100 g/mol

Mass of CaCO₃ from the balanced equation = 1 × 100 = 100 g

Molar mass of CaO = 40 + 16

= 56 g/mol

Mass of CaO from the balanced equation = 1 × 56 = 56 g

SUMMARY:

From the balanced equation above,

100 g of CaCO₃ decomposed to produce 56 g of CaO.

Finally, we shall determine the mass of CaO produced by the decomposition of 250 tonnes (i.e 2.5×10⁸ g) of CaCO₃. This can be obtained as follow:

From the balanced equation above,

100 g of CaCO₃ decomposed to produce 56 g of CaO.

Therefore, 2.5×10⁸ g of CaCO₃ will decompose to produce =

(2.5×10⁸ × 56)/100 = 1.4×10⁸ g of CaO.

Thus, 1.4×10⁸ g of CaO will be obtained from 250 tonnes (i.e 2.5×10⁸ g) of CaCO₃.

Answer:

They get more energy, so they vibrate!

Explanation:

Answer:

all of the above

Explanation:

Answer:

all of the above

Answer:

Mineral deficiencies can lead to a variety of health problems, such as weak bones, fatigue, or a decreased immune system.

Explanation:

There are five main categories of mineral deficiency: calcium, iron, magnesium, potassium, and zinc.

One major cause of mineral deficiency is simply not getting enough essential minerals from food or supplements.

Answer:

it can lead to a variety of health problems, such as weak bones, or a decreased immune system.

Explanation:

The molar mass of MgCrO4 is approximately 140.30 g/mol.

To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.

The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).

The atomic masses of the elements can be found on the periodic table:

Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.

Chromium (Cr) has an atomic mass of around 51.99 g/mol.

Oxygen (O) has an atomic mass of about 16.00 g/mol.

Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:

Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)

Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)

Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol

Molar mass ≈ 140.30 g/mol

for more such questions on mass

https://brainly.com/question/24191825

#SPJ8

Answer:

1 mole weighs 40 g

Explanation:

If 0.1 mol of a substance, i.e 10% of a substance weighed 4 g,

then 10×10% ⇒ 100% of a substance, i.e, 1 mole weighs 4×10 = 40 g

∴ 1 mole weighs 40 g

Answer:

a

...

........

...........

Answer:

The balanced equation is:

2 HNO3 + Mg ---> Mg(NO3)2 + H2

From the equation, we can see that we need twice the moles of HNO3 than the moles of Mg

Moles of Mg:

Molar mass of Mg = 24 g/mol

Moles = Given mass / Molar Mass

Moles of Mg = 4.47 / 24 = 0.18 moles (approx)

Hence, 2(moles of Mg) = 0.36 moles of HNO3 will be consumed

Number of moles of HNO3 after the reaction is finished is the number of unreacted moles of HNO3

Unreacted moles of HNO3 = Total Moles - Moles consumed

Unreacted moles of HNO3 = 0.64 moles (approx)

Since we approximated the value of moles of Mg, the value of remaining moles of HNO3 will also be approximate

From the given options, we can see that 0.632 moles is the closest value to our answer

Therefore, 0.632 moles will remain after the reaction

A physical property of a pure substance is anything that can we can observe without changing its identity.

Density:

The density is property of matter which expresses  a relationship of mass to volume.

Melting:

The melting pint is the physical property because we can determine the melting point of a substance without changing its chemical composition.

Boiling:

As the liquid matter is heated further it eventually boils or vaporizes into a gas at the boiling point.

Conductivity:

Conductivity is the physical property  because the identity of the substance does not change.

So we can conclude that a physical property of a pure substance is anything that can we can observe without changing its identity.

Learn more about Conductivity here: https://brainly.com/question/24943129

#SPJ1

Answer:

Explanation:Hello :) I hope the explanation helps, PFAS chemicals are called "forever chemicals" because they do not break down easily in the environment and can persist for a very long time. The term "forever chemicals" is used to describe PFAS because they have very strong carbon-fluorine bonds that are difficult to break down through natural processes such as biodegradation, photolysis, or hydrolysis. This makes them highly resistant to degradation and therefore they can persist in the environment for decades or even centuries. In addition to their long lifespan, PFAS chemicals are also highly mobile and can travel long distances in the environment. They can enter the soil, water, and air and accumulate in the food chain. They have been detected in wildlife, human blood, and breast milk. The longevity and persistence of PFAS chemicals make them a concern for human and environmental health. They have been linked to a range of health effects including cancer, immune system dysfunction, and developmental delays, among others. Due to their ability to accumulate in the environment and in living organisms, they are a subject of increasing regulatory scrutiny and efforts to reduce their use and release into the environment. You are welcome to ask me any questions :)

INFORMATION:

We have the next statement:

- "An exothermic reaction releases thermal energy."

And we must determine if it is true or false

STEP BY STEP EXPLANATION:

An exothermic reaction is a reaction in which energy is released in the form of light or heat.

Finally, knowing that in an exothermic reaction energy is released in the form of heat, we can say that an exothermic reaction releases thermal energy. So, it is true.

ANSWER:

True