hydrogen at a pressure of 1 atm condenses to a liquid at 20.3 k and solidifies at 14.0 k. the vapor pressure of liquid hydrogen is 0.213 atm at 16.0 k. calculate the volume of 1.00 mol h2 vapor under these conditions and compare it with the volume of 1.00 mol h at standard temperature and pressure.

Answer:

It appears to be

Explanation:

I did that question.

The shape of an electron cloud is primarily determined by the electron's energy sublevel, which is a function of its principal quantum number. Option A

Electrons occupy different energy sublevels within an atom's electronic configuration, and these sublevels have different shapes, orientations, and energies. The shapes of these sublevels are determined by the probability distribution of the electrons in that sublevel, which is a mathematical function that describes the likelihood of finding the electron at any given point in space.

The probability distribution is determined by the quantum mechanical properties of the electrons, which are described by their wave functions. The shapes of the energy sublevels are characterized by different types of orbitals, such as s, p, d, and f orbitals, each with a distinct shape and orientation.

The position and speed of the electron also play a role in determining its energy and behavior, but they do not directly determine the shape of the electron cloud. Option A

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Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.

The number of the  protons are contained in the nucleus of an argon atom is 18 protons of argon atom.

The atomic number of the argon is 18 . The atomic number of the element is exactly equals to the number of the protons in that atom. The number of the proton and the number of the electrons is exactly equals to each other for the neutral atom.

The number of the neutron in the nucleus of the argon atom is 22 neutrons. The atomic mass of the argon atom is 40 amu.

Thus there are 18 protons in the nucleus of the argon atom.

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Answer:

2.114 atm

Explanation:

Since it is just pressure and volume, use Boyle's Law

P1V1 = P2V2

Then plug in numbers

(1 atm)(1 L) = P2(.473 L)

P2 = 2.114 atm

Milk of magnesia helps to neutralize stomach acid because it is a strong base.

Acid: Acids have a sour taste and turn certain dyes red.

It gives off hydrogen ions in water and forms salts by combining with certain metals.

Acids are substances that has pH greater less than 7.

Base: Base turn certain dyes blue.

It takes off hydrogen ions in water and forms salts by combining with certain metals.

It has pH greater than 7.

When acid and base combine, salt is formed.

Milk of magnesia is a laxative that is thought to work by drawing water into the intestines, an effect that helps to cause movement of the intestines.

It is an antacid.

Hence, Milk of magnesia helps to neutralize stomach acid because it is a strong base.

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The reactivities of tert-butyl bromide and 2-bromopropane are related to the stabilities of the carbocations produced as intermediates in the reaction in several ways.

First, it is important to note that tert-butyl bromide has an electron-withdrawing group (carbonyl) attached to its aromatic ring. This makes it more reactive than 2-bromopropane because it is easier for tert-butyl bromide to achieve a favorable resonance structure.

Second, it is also important to note that tert-butyl bromide has a more stable carbocation intermediate than 2-bromopropane because it has a larger number of bonds between carbon atoms. This means that these bonds take longer to break apart during the transition state, which makes it harder for tert-butyl bromide's intermediate to form.

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Answer

Explanation

In the oxidation number method of balancing chemical equations, you determine the oxidation numbers of all atoms. Then you multiply the atoms that have changed by small whole numbers. You are making the total loss of electrons equal to the total gain of electrons. Then you balance the rest of the atoms.

The given equation is:

Ag + H₂S + O₂ —> Ag₂S + H₂O

Step 1. Identify the atoms that change oxidation number.

Left hand side: Ag = 0, H = +1, S = -2, O = 0

Right hand side: Ag = +1, S = -2, H = +1, and O = -2

The changes in oxidation number are:

Ag: 0 → +1; Change = +1

O: 0 → -2; Change = -2

Step 2. Equalize the changes in oxidation number.

Each Ag atom has lost one electron, and each O atom has gained two electrons.

O: 0 → -2; Change = -2,

Answer:

Contemporary light microscopes are able to magnify objects up to about a thousand times. Since most cells are between 1 and 100 μm in diameter, they can be observed by light microscopy, as can some of the larger subcellular organelles, such as nuclei, chloroplasts, and mitochondria.

The final equilibrium temperature when 0.645 kg of molten silver is added to 0.8 kg of water at 20°C is approximately 39°C.

Let us apply the principle of conservation of energy: Heat gained by the cold body is equal to the heat lost by the hot body. Let’s take the following details into consideration: Heat lost by molten silver = Heat gained by water. Heat lost by molten silver: Q1 = mass × specific heat capacity × change in temperature Q1 = 0.645 kg × 235 J/kg°C × (962°C – T).

Heat gained by water: Q2 = mass × specific heat capacity × change in temperatureQ2 = 0.8 kg × 4,186 J/kg°C × (T – 20°C)At equilibrium, Q1 = Q2. Therefore, we can write:0.645 × 235 × (962 – T) = 0.8 × 4186 × (T – 20)151522.25 – 235T = 3348T – 66960Solving for T, we get: T = 39°C. Therefore, the final equilibrium temperature when 0.645 kg of molten silver is added to 0.8 kg of water at 20°C is approximately 39°C.

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The percent dissociation for 0.010 M hypochlorous acid with a K value of 3.0 x 10^-8 is 0.99%.

To calculate the percent dissociation of hypochlorous acid (HOCl), we need to consider its equilibrium reaction:

HOCl ⇌ H+ + OCl-

The equilibrium constant (K) for this reaction is given as 3.0 x 10^-8. The percent dissociation can be calculated using the following steps:

Set up an ice table to represent the initial, change, and equilibrium concentrations of the species involved in the equilibrium reaction.

Initial: [HOCl] = 0.010 M, [H+] = 0 M, [OCl-] = 0 M

Change: -x, +x, +x

Equilibrium: [HOCl] = 0.010 - x M, [H+] = x M, [OCl-] = x M

Write the expression for the equilibrium constant (K) using the concentrations of the species at equilibrium.

K = [H+][OCl-] / [HOCl]

Substitute the equilibrium concentrations into the equilibrium constant expression.

K = (x)(x) / (0.010 - x)

Since the percent dissociation is defined as (amount dissociated / initial concentration) x 100%, we can solve for x to calculate the percent dissociation.

K = (x)(x) / (0.010 - x)

Rearrange the equation and solve for x.

Once we find the value of x, we can calculate the percent dissociation using the formula:

Percent dissociation = (x / 0.010) x 100%

Solving the equation, we find that x is approximately 9.9 x 10^-4. Therefore, the percent dissociation is (9.9 x 10^-4 / 0.010) x 100% = 0.99%.

So, the percent dissociation for 0.010 M hypochlorous acid with a K value of 3.0 x 10^-8 is 0.99%. This means that approximately 0.99% of the initial concentration of hypochlorous acid will dissociate into H+ and OCl- ions at equilibrium.

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The opposite of heterotroph is autotroph.

What is heterotroph?

An organism is referred to as a heterotroph if it consumes other plants or animals for food and energy. Its origins are in the Greek words hetero, which means "other," and trophe, which means "nutrition."

Examples - Human, birds, dogs, etc.

What is autotroph?

A primary producer, also known as an autotroph, is an organism that uses energy from light or inorganic chemical reactions to create complex organic chemicals from simple ones, such as carbon dioxide.

Example - plants, algae etc.

The opposite of heterotroph is autotroph.

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Properties that describe how a substance changes into a completely different substance are called chemical properties, general properties of matter such as color, density, hardness, are examples of physical properties.

The general properties of matter such as color, density, hardness, are examples of physical properties. Properties that describe how a substance changes into a completely different substance are called chemical properties. Flammability and corrosion/oxidation resistance are examples of chemical properties.

Flammability is the ability of matter to burn. When matter burns, it combines with oxygen and changes to different substances.

Properties that help geologists identify a mineral in a rock are: color, hardness, luster, crystal forms, density, and cleavage. Crystal form, cleavage, and hardness are determined primarily by the crystal structure at the atomic level.

Flammability is a measure of how quickly a specific material is capable of catching fire and burning. It indicates the ease with which a material can ignite and the intensity with which it burns once it catches on fire.

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The molarity of the 10.0% CaCl₂ solution is 0.9007 M

Molarity of a solution is defined as the number of moles of solute present in 1 litre of the solution.

To calculate the molarity of the CaCl₂ solution, we need to first determine the mass of CaCl₂ present in one liter i.e. 1000 ml of the solution.

A 10.0% CaCl2 solution means that 10.0 g of CaCl₂ is present in 100 g of the solution.

We can use this information to calculate the mass of CaCl2 in one liter of the solution as follows:

Mass of CaCl₂ in 1 L

= (10.0 g CaCl₂ / 100 g solution) x (1000 g solution / 1 L solution)

∴ Mass of CaCl₂ in 1 L = 100 g CaCl₂ / 1 L solution

Now since we know the mass of CaCl₂ in one liter of the solution, we can use the molarity formula to calculate the molarity of the solution:

Molarity = moles of solute / volume of solution (in liters)

To find the moles of CaCl₂ present in one liter of the solution, we need to divide the mass of CaCl₂ by its molar mass.

The molar mass of CaCl₂ is 110.98 g/mol

moles of CaCl₂ in 1 L

= 100 g CaCl₂ / 110.98 g/mol

= 0.9007 mol

Finally, we can use the formula for molarity to calculate the molarity of the solution:

Molarity = moles of solute / volume of solution in L

Molarity

= 0.9007 mol / 1 L

= 0.9007 M

Thus, molarity of the solution is 0.9007 M

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0.5117 mol/L of the compound is left after 3.28 seconds if the rate constant is 0.0338 sec⁻¹.

The rate constant defines the relationship between the molar concentration of the reactants and the rate of the chemical reaction.

The value of the rate constant is temperature dependent. A large value of the rate constant means that the reaction is relatively fast, while a small value of the rate constant means that the reaction is relatively slow.

It's affected by adding or changing a catalyst, changing the pressure, or even by stirring the chemicals.

For a first order reaction, the rate equation is given by -

\([A]_{t} = [A]_{0} e^{-kt}\)

Where:

[A] is the concentration of the compound at time t

[A]₀ is the initial concentration of the compound

k is the rate constant of the reaction

t is the time

Given:

Initial concentration [A]₀ = 0.571 mol/L

Rate constant k = 0.0338 sec⁻¹

Time t = 3.28 sec

[A]t = 0.571 mol/L × e^(-0.0338 × 3.28)

[A]t ≈ 0.571 mol/L × 0.8957

[A]t ≈ 0.5117 mol/L

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Answer:

C. Density

all the others are chemical properties

Answer:

C: Density

Explanation:

Answer:

3.07122*10^24 particles

Explanation:

To convert moles to particles, remember that a mole of something is defined as 6.022*10^23 atoms of that thing.

5.1 mol * 6.022x10^23/1 mol = 3.07122*10^24 particles

The concentration of the aqueous solution of Ca(OH)2 with a pH of 11.31 is approximately 0.00126 M.

To calculate the concentration of Ca(OH)2, we first determine the pOH of the solution by subtracting the pH from 14: pOH = 14 - 11.31 = 2.69. The pOH represents the negative logarithm (base 10) of the hydroxide ion concentration.

Using the pOH value, we can find the concentration of OH- ions: [OH-] = 10^(-pOH) = 10^(-2.69) ≈ 0.00126 M.

Since each formula unit of Ca(OH)2 dissociates into two OH- ions, the concentration of Ca(OH)2 is twice the concentration of OH- ions. Therefore, the concentration of the Ca(OH)2 solution is approximately 2 * 0.00126 M, which is 0.00252 M.

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Answer:

Explanation:

In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.

X-rays are neutral and cannot be bent in a magnetic field. The new radiation was bent by the magnetic field so that the radiation must be charged and different than x-rays.

Significance of dams and canals are :-

hope it helps ~

By understanding conversion factors and how they are related to each other we can use dimensional analysis to solve  problems.

Dimensional Analysis is a step by step approach to solving problems in Physics, Chemistry , and Mathematics. It involves having a clear knowledge and understanding to be able to convert a given unit to another in the same dimension using  conversion factors and knowing how they are related to each other.

For instance, In Chemistry, we want to Convert 120mL to L.(note that ml stands for millilitres and ;L stands for litres)

Or first approach will be to write out the conversion factor related to our problem which is

1000ml =1L

such that 120ml = (we cross multiply))

giving us  120ml x 1L/1000ml =0.12L

This same process is applied to convert any type of dimensional analysis problems be it physics or mathematics.

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The value of R in Atm is 0.0821 LAtm/molK.

R, known as the gas constant, is a fundamental constant used in the ideal gas law, which describes the behavior of an ideal gas under certain conditions.

The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, T is the temperature in Kelvin, and R is the gas constant.

The value of R in Atm is used to convert between units of pressure, volume, and temperature when using the ideal gas law. It is defined as 0.0821 LAtm/molK, which means that for every mole of gas, if the pressure of the gas increases by 1 Atm, the volume will decrease by 0.0821 liters for every kelvin degree of temperature.

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Explanation:

Overfishing is the removal of a species of fish from a body of water at a rate that the species cannot replenish, resulting in those species becoming underpopulated in that area.

The correct answer is Nitrogen.

From the given question the electronic configuration of the element is given as:

1s²2s²2p³

hence, we know that the maximum no of electrons in the sub-shell

s= 2

p=6

while in this p has only 6 electrons.

Thus by counting the number of electrons in each sub-shell we can know the atomic number as several electrons in an atom is equal to the atomic number of the atom.

thus, the no of electrons present is- 2+2+3= 7

For, 7 electrons the element present will be nitrogen with atomic number 7.

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Option (a) is correct. The electrons involved in metallic bonding are transferred from one atom to another.

A metallic bond are formed from delocalized electrons which causes the effective nuclear charge on electrons on the cation to increase in effect making the size of the cation smaller. Metallic bonds are strong and require a great deal of energy to break metals have high melting and boiling points. metal's unique chemical and physical properties. In metallic bond, force that holds atoms together in a metallic substance. Such a solid consists of closely packed atoms. In most cases the outermost electron shell of each of the metal atoms overlaps with a large number of neighboring atoms. the valence electrons continually move from one atom to another and are not associated with any specific pair of atoms.

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Answer: 1/2

Explanation:

It’s really all in the question so if 1/3 = 1/6

1/3 x 3 = 3 ( mind you were dealing with isolation)

So after you do that 3 x 1/6 = 1/2

(This maybe wrong but like I’m in middle school so what do expect like what am I doing on brainless a 3 am )

The most likely method for monitoring the concentration of dye during the reaction in this experiment is UV-Vis absorption. This is because UV-Vis spectroscopy is a common technique used to measure the concentration of colored compounds in solution, including dyes.

Redox reactions can also be used to monitor the concentration of certain compounds, but it would depend on the specific reaction being studied. Acid-base titration would not be suitable for monitoring the concentration of a dye because dyes are typically not acidic or basic enough to participate in acid-base reactions.

the reaction in this experiment can be determined using the following method: b) UV-Vis absorption. This method involves measuring the absorbance of light by the dye at a specific wavelength, which is related to the concentration of the dye in the solution.

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Answer:

42.4m

Explanation:

Given parameters:

Speed of the fish = 0.8m/s

Distance  = 34m

Unknown:

Time taken for the fish to swim = ?

Solution:

Speed is the distance divided by the time taken;

     Speed  = \(\frac{distance}{time}\)  

       Time  = \(\frac{distance}{speed}\)  

Now, insert the parameters and solve;

        Time  = \(\frac{34}{0.8}\)    = 42.4s

Yes, it is possible to prepare 2-bromopentane in high yield by halogenation of an alkane. In the presence of UV light or heat, free-radical halogenation of alkanes happens.

The reaction proceeds in three phases: chain initiation, chain propagation, and chain termination. The propagation phase generates several mono-haloalkanes as intermediates in the formation of polyhalogenated compounds that may have more than one halogen atom.

For example, suppose pentane (C5H12) is subjected to radical halogenation with bromine (Br2).

In that case, 2-bromopentane (C5H11Br) is produced as one of several potential products, depending on the reaction conditions (temperature, halogen concentration, and so on).It is predicted that radical halogenation of an alkane would produce a mixture of mono-haloalkanes. In the case of pentane, for example, it is possible to form 8 different monohalo isomers. In the case of 2-bromopentane, only one stereoisomer is possible. As a result, the maximum possible yield of 2-bromopentane is roughly 12.5% (1/8th of the total possible products).

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