lans.
2. A sample containing 1.80 mol of argon gas has a volume of 10.00 L. What is
the new volume of the gas, in litres, when each of the following changes occurs in
the quantity of the gas? Assume that pressure and temperature remain constant.
The changes are not cumulative. T
(a) An additional 1.80 mol of argon gas is added to the container. [ans: 20.0 L]
(b) A sample of 25.0 g of argon gas is added to the container. [ans: 13.5 L]
(c) A hole in the container allows half of the gas to escape. [ans: 5.00 L]

The atom or molecule that contributes electrons—in this case, magnesium is known as the reducing agent because the reduction of another molecule is made possible by the electrons it donates.

a molecule that, during a redox reaction, takes or absorbs electrons from another molecule. In a redox reaction, an electron acceptor reduces itself and acts as an oxidizing agent. Oxygen, nitrate, iron (III), manganese (IV), sulfate, carbon dioxide, and other elements are examples of acceptors.

A chemical species that "donates" an electron to an electron recipient is referred to as a reducing agent in chemistry. This chemical species is also referred to as a reductant, reducer, or electron donor (called the oxidizing agent, oxidant, oxidizer, or electron acceptor).

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Water, ice, acids, salts, plants, animals, and temperature fluctuations are all mechanical weathering agents. Erosion is the process by which the broken pieces of rock and mineral are moved away after a rock has been cracked.

Rocks that have holes or are porous (have holes) experience freeze-thaw weathering (allows water to pass through). In this case, mechanical weathering is evident. Different fissures in the rock allow water to enter (from rain, melting snow, or ice).

Weathering that releases pressure. Definition. expansion associated with the release of confining pressure when deeply buried rock is unroofed, leading to the development of fractures near the surface of solid rock. Typically, fractures spread along surfaces parallel to and near the surface.

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In 1939, 740 migrant ship passengers were turned away from London city port, despite having immigration papers.

In 1939, the passenger ship MS St. Louis was carrying 740 Jewish refugees who had fled Nazi-occupied Europe and were seeking asylum in the United States. The ship had been turned away from Cuba, and when it arrived in Miami, the U.S. government also refused to allow the passengers to disembark.

The ship then headed to Canada and was turned away from Montreal. Finally, it arrived in the port of London, where it was also denied permission to land. The passengers were forced to return to Europe, and many of them later died in the Holocaust. The incident is a tragic example of the difficulties faced by Jewish refugees during World War II and the lack of political will to provide them with a safe haven.

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Answer:

36 grams of Calcium

Explanation:

In order to calculate the gram of calcium, divide the total number of Calcium atoms by Avogadro's number:

(2.17 x 10^25)/(6.02 x 10^23) =

2.17/6.02 * 10^25/10^23 =

2.17/6.02 * 10^25/10^23 =

0.36 * 10^(25-23) =

0.36 * 10^2 =

0.36 * 100 = 36 grams of Calcium

The central atom in the iodite ion, IO21-, is surrounded by two bonding pairs and two unshared pairs of electrons.

The center atom in a molecular formula is often the atoms with the smallest subscript and the largest bonding potential. The lowest electronegative atom is normally the central atom when all the atoms typically make the same number of bonds. The main ion in K3[Fe(CN)6] is Fe3+. These central atoms & central ions serve as Lewis acids, or acceptors of a electron pair.

Here, the oxygen atom at the center has undergone hybridization. So there are 3 2p orbitals and a 2s orbital when we look at the creation of the water molecule. The 4 sp3 hybrid orbitals are produced by these together.

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86,472.46 J

The heat required to melt ethanol can be calculated using the formula:

heat = mass × heat of fusion

After plugging in the values ​​it looks like this:

Heat = 199 g × 109.1 J/g

= 21489.9

In order to heat the molten ethanol to a higher temperature, the heat capacity of ethanol must also be considered. The heat capacity of ethanol is 2.44 J/g × degree Celsius. To bring the molten ethanol to a sufficient temperature, we need to know the desired final temperature and the initial temperature (the melting point of ethanol, -114.1 degrees Celsius). Let's say the desired final temperature is 25 degrees Celsius.

The heat required to raise the temperature of molten ethanol can be calculated using the formula:

heat = mass × heat capacity × (final temperature - initial temperature)

After plugging in the values ​​it looks like this:

Heat = 199 g × 2.44 J/g degrees Celsius × (25 degrees - (-114.1 degrees))

= 199 g × 2.44 J/g degrees Celsius × 139.1 degrees

= 64982.56 J

add 21489.9 J + 64982.56 J = 86,472.46 J

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Answer: 13.175

Explanation:

[tex]\text{Molarity}=\frac{\text{moles of solute}}{\text{liters of solution}}[/tex]

To find the moles of solute, we begin by finding the formula mass of NaOH.

This means 527 grams of NaOH is equal to [tex]\frac{527}{40}=13.175[/tex] moles.

So, the molarity is [tex]\frac{13.175}{1}=13.175 \text{ M}[/tex]

Answer: 0.101

Explanation:

Using the fact that molarity = (moles of solute)/(liters of solution), there are [tex](0.150)(35.5/1000)=0.005325[/tex] moles of barium hydroxide.

There are 2 moles of hydroxide ions per mole of barium hydroxide, meaning that there are [tex](0.005325)(2)=0.01065[/tex] moles of hydroxide ions.

To neutralize the solution, the number of moles of hydrogen ions must be equal to the number of moles of hydroxide ions.

Since there is 1 mole of hydrogen ions per mole of nitric acid, we need 0.01065 moles of nitric acid.

Substituting into the molarity formula yields that the concentration is [tex]\frac{0.01065}{0.105}=0.101[/tex] M.

1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat :

The malonic is the method of the synthesis for preparing the carboxylic acid from the alkyl halides. the alkyl halide are also called as the haloalkanes. one or more alkyl hydrogen atom are replaced by the halogen such as : fluorine, chlorine, bromine, iodine from the alkane compound. the halogen substituted alkanes are called as alkyl halide.

Thus, the alkyl halide form the carboxylic acids by the method of the malonic ester synthesis. the image is attached with the structure of the compounds.

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According to VSEPR theory , bond angles in organic compounds are generally close to 109°, 120° or 180°.

Hybridization is defined as the mixing of two atomic orbitals which give rise to a new hybridized molecular orbital.

The hybrid orbitals so formed are different in energies and shapes. Equal energy atomic orbitals take part in hybridization. Since, valence bond theory failed to correctly predict the molecular structure, hybridization helps to understand the concept of bond formation, bond energies and bond lengths.

The shape of a molecule can be predicted from the electron pairs that surround the central atom by using Valence Shell Electron Pair repulsion (VSEPR) theory. This theory is based on the assumption that for a molecule to take a shape, its electronic repulsion should be minimized. That is why, according to experimental findings the angles between atoms of organic compounds are generally close to 109°, 120° or 180°.

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This chemical reaction demonstrates the conservation of mass. Balanced chemical equation is 2KNO₃ → 2KNO₂ + O₂

What is Law of Conservation of Mass?

A neutral atom or molecule can become electrically charged atoms by obtaining or losing a free electron, which is the According to the principle of mass conservation, neither chemical processes nor physical changes can create or destroy mass in a closed system. The mass of the products of a chemical reaction must be equal to the mass of the reactants in accordance with the law of conservation of mass.

That is to say, the mass of any one element at the start of a reaction will be equal to that element's mass at the conclusion of the reaction. The overall mass will remain constant over time in any closed system if we take into account all reactants and products in a chemical reaction.

2KNO₃ → 2KNO₂ + O₂

Now the given equation is balanced because there are equal number of atoms of potassium, nitrogen and oxygen are present on both side of equation.

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Since chlorine only has 17 electrons, the atoms 1+ and 2+ require argon & potassium, that have 18 and 19 electrons, respectively. We require the atoms S- & P-2, which have 16 & 15 electrons respectively, for 1 and 2.

When the number of protons within the nucleus is different from the amount of electrons around that nucleus, an electrical charge is created in the atom of matter. A negative charge is present in an atom if it contains more electrons than protons. A positive charge is present in an atom if there are more protons than electrons.

Ampere-second or Coulomb are the SI units for measuring charge.

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The wavelength of a photon is 622nm and it is a red light.

The length of a waveform signal that is propagating in space or over a wire is measured by the separation between identical points (adjacent crests) in the adjacent cycles. This length is typically specified in meters (m), centimetres (cm), or millimetres (mm) in wireless systems (mm).

A discrete bundle (or quantum) of electromagnetic (or light) energy is referred to as a photon. Photons move at the speed of light (3 108 m/s) because they have no mass.

λ = v/f

where, f = frequency = 4.82 × [tex]10^{14} Hz[/tex]

v = speed of light = 3 × [tex]10 ^{8}[/tex] m/s

λ = 3 × [tex]10^{8}[/tex] / 4.82 × [tex]10^{14}[/tex]

λ = 6.22 × [tex]10^{-7}[/tex]

λ = 622 nm.

Hence, the wavelength of a photon is 622nm and it is red light.

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The masses that we need for the reaction are 261.6 g Zn; 630 g [tex]HNO_{3}[/tex]

We know that the place to begin when we are talking about a reaction is to be able to put down the equation of the reaction and this would help us so as to find what we are looking for.

In this case, the equation of the reaction can now be written as;

[tex]Zn (s)+ 2HNO_{3} (aq) ---- > Zn(NO_{3} )_{2} (aq) + H_{2} (g)[/tex].

Using the relation;

Number of moles = mass/molar mass

=  261.6 g/65 g/mol

4 moles

Number of moles of nitric acid = 630 g/63 g/mol

= 10 moles

Thus, we can see from the stoichiometry of the reaction that has been shown in the equation here that we need 261.6 g Zn; 630 g [tex]HNO_{3}[/tex] so as to obtain the required 00 g of ammonium nitrate as it is in the question that we have above.

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The reaction occurs at constant pressure, - 385.89 kJ amount of heat is released during the reaction.

The heat released by any reaction will be calculated as:

ΔH = ΔH of products -  ΔH of reactants

Given chemical reaction is:

2CH₄ + 5F₂ → 2CF₄ + 2HF

From the stoichiometry of the reaction, it is clear that,

2 moles of CH₄ = react with 5 moles of F₂

1 moles of CH₄ = react with 5/2 moles of F₂

So, 0.610 moles of CH₄ = react with 0.610×5/2=1.525 moles of F₂

Given moles of F₂ = 0.760moles, which is less as compared to the calculated moles so for this reaction F₂ is the limiting reactant.

From the stoichiometry:

5 moles of F₂ = produce 2 moles of CF₄ & HF each

0.760 moles of F₂ = produce 2/5×0.760=0. 304moles of CF₄ & HF each

From the stoichiometry of the reaction, it is also clear that 0.. 304 moles of CF₄ & HF each require 0.176 moles of CH₄.

We know that the value of heat of formation of the below molecules is as:

CF₄ = -74.8kJ/mole

HF = -271.1 kJ/mole

CF₄ = -925.0 kJ/mole  

F₂ = 0

Now we put all these values on the above equation with their respective moles, and we get

ΔH = (0.176 x -271.1 kJ/mole + 0.176 x -925 kJ/mole) - (0.176 x -74.8 kJ/mole) = - 389.95 kJ

Hence, - 385.89 kJ amount of heat is released.

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The concentration of the KOH=  0.15M.

What is concentration?

The concentration of a substance, such as salt, in a particular volume of tissue or liquid, such as blood. The substance concentrates when there is less water present.

What is stock solution?

A solution that has been diluted to a lower concentration and will be used. The default strategy could be used independently or as a component of a more complex solution. A working solution is the option we ultimately settle on.

M stock V stock = M dilute V dilute

25ml* 6M = M* 1L * 1000ML/1L

25Ml*6M/1000Ml = M

M dilute = 0.15M

Concentration of KOH = 0.15M

Therefore, the concentration of the KOH=  0.15M.

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The strong acid and strong base has high rate constant of dissociation. The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, when a base is made into an aqueous solution, it is called alkali.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion. when a base is made into an aqueous solution, it is called alkali.

Therefore, when a base is made into an aqueous solution, it is called alkali.

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The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.

Reaction is a response, typically sudden, to a particular event, situation, or stimulus. It is a type of behavior that occurs as a result of an external force, such as an event, person, or object. Reactions can be physical, emotional, mental, or a combination of all three. Examples of physical reactions include facial expressions, muscle tension, and changes in heart rate and breathing.

The heat of this endothermic reaction can be calculated using the equation q=mc∆T,
where q is the heat,
m is the total mass of the solution,
c is the specific heat capacity of water, and
∆T is the change in temperature.
In this case, the total mass of the solution is 300 mL and the change in temperature is (45.0°C - 15.8°C) = 29.2°C.
The specific heat capacity of water is 4.18 J/g°C.
Therefore, the heat of the reaction is q = (300 mL)(4.18 J/g°C)(29.2°C) = 366 kJ.
Since the reaction is 1 mole of BaCl₂,
The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.

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Answer:

Pressure Increases With Depth The weight of the water above a diver exerts pressure on their body. The deeper a diver descends, the more water they have above them, and the more pressure it exerts on their body.

Explanation:

Answer: a. n = 3, l = 2: The subshell in which electrons with these quantum numbers are found is the d subshell.

b. n = 1, l = 0: The subshell in which electrons with these quantum numbers are found is the s subshell.

c. n = 4, l = 3: The subshell in which electrons with these quantum numbers are found is the f subshell.

d. l = 3: It is not possible to determine the subshell in which electrons with this quantum number are found, as the principal quantum number "n" is not specified. The angular momentum quantum number "l" only specifies the shape of the orbital, not the energy level or subshell.

Explanation:

In virtually every stable compound, each of the atoms has achieved an electron configuration analogous to that of the noble elements.

Noble elements are those which have completely filled orbits, they are highly stable compounds, they do not react under normal conditions.

All the chemical compounds and elements have tendency to be stabilized by achieving the nearest inert electronic configuration.

They are classified as non-metals and they come under p-block elements. They have a complete octet; therefore, their electronic configuration is n[tex]s^{2}[/tex]n[tex]p^{6}[/tex],Their ionization enthalpy has a very high value, but xenon can react with highly electronegative atoms like oxygen and fluorine to form corresponding xenon compounds.

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There are more actual collisions between the reactant particles. We anticipate that the first step is the rate-determining step if the rate law is rate=k[A][B].

[C] has no effect on the reaction rate. On the other hand, we anticipate the second step to be the rate-determining step if the rate law is rate=k[A]B]C]. The following is the empirically discovered rate rule for ozone depletion: k [O3] = rate. A mechanism must be in accordance with the rate law discovered through experiment. The number of collisions increases as the temperature rises. The frequency of reactant collisions increases as a reactant's concentration rises, which in turn accelerates the rate of the reaction.

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pH of the solution is the negative logarithm of its H+ ion concentration. Nitric acid solution contains equal-molar H+ and nitrate ions. The pH of 0.380 M HNO₃ solution is 0.42.

pH of a solution is its measure of H+ ion concentration. It tells how much acidic or basic the solution is. The solution is neutral at a pH of 7 , acidic at pH below 7 and basic above 7.

Mathematically pH is the negative logarithm of H+ ion concentration. HNO₃ ionizes to equal H+ ions and NO₃ - ions. Thus, 0.380 M solution contains 0.380 M H+ ions.

pH = - log [H+]

     = - log (0.380 M)

     = 0.42

Therefore, the pH of the nitric acid solution is 0.42.

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Molarity of the original calcium hydroxide solution = (16.5 ml x 3.04 m KOH) / 32.8 ml = 0.95 m

Step 1: Calculate the moles of perchloric acid in the original solution:

Moles of perchloric acid = (1.41 m)(51.8 ml) = 72.3 moles

Step 2: Calculate the moles of calcium hydroxide in the original solution:

Moles of calcium hydroxide = (32.8 ml)(1 M) = 32.8 moles

Step 3: Calculate the moles of potassium hydroxide needed to reach neutrality:

Moles of potassium hydroxide = (16.5 ml)(3.04 M) = 49.76 moles

Step 4: Calculate the moles of calcium hydroxide in the solution after the addition of the potassium hydroxide:

Moles of calcium hydroxide = 32.8 moles + 49.76 moles = 82.56 moles

Step 5: Calculate the molarity of the calcium hydroxide in the original solution:

Molarity of calcium hydroxide = (82.56 moles)/(32.8 ml) = 2.52 M

Molarity is a measure of the concentration of a solute in a solution. It is expressed as the number of moles of solute per liter of solution (mol/L). It is used to calculate the amount of a solute that must be added to a solution to achieve a desired concentration. It is also used to measure the amount of a substance in a given volume of solution. Molarity is a key concept in chemistry, and is important to understand when discussing the behavior of solutions and the reactions they undergo.

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The decreasing order of lattice energy realesed is GaN>CaS>LICI>RbBr.

The lattice energy depends on the following two factors. They are product of charges of the compound and radius of the ions.

Higher the charge of ions, higher will be the lattice energy. Smaller the radius of ion, larger will be the lattice energy.

Consider the given compounds as follows: LiCl, CaS, GaN and RbBr

The charges of ions of given compounds are Li⁺, Cl⁻, Ca²⁺, S²⁻, Ga³⁺,N³, Rb⁺ and Br⁻. So, in the given compounds GaN has higher lattice energy. After GaN, CaS has higher lattice energy. Out of two compounds LiCl and RbBr, Li has less ionic well as ionic radius than Rb. Since in groups from top top to bottom atomic size increases as well as ionic radius.

Therefore, LiCl has higher lattice energy than RbBr.

Hence, the decreasing order of lattice energy realesed is GaN> CaS>LICI>RbBr

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The Molar concentration for the H2SO4 titrated against base is 8.55M.

Molar concentration=MV=0.90 x 19=17.1

Titrated against 2 mol base so dividing the molar concentration with 2 and finally getting required result.

New molar concentration=17.1/2=8.55M

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The answer which best describes type of solid the elements and compounds below form, in that order Kr , CH₃OH , BaBr₂ , Diamond are : the correct option is e ) atomic , molecular , ionic , network.  

The solid Kr is atomic in nature. Kr is represent the atom. The compound   CH₃OH is of molecular type. the OH group is attached to the carbon atom with covalent bond. so,  CH₃OH is the molecular compound. The compound BaBr₂  is the ionic compound , the bond present in the BaBr₂  is the ionic compound, that is the bond formed by the complete transfer of the electron. The diamond is the example of the network solid.

Thus, the correct option is :  atomic , molecular , ionic , network.

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45.1KJ is  the enthalpy of the given reaction.

The formation reaction of CO,NH3,HCN,H2O are-

Thus to attain the given equilibrium we reverse the equation 1 and 2 the add with 3 and 4. So ΔH of total reaction is 45.1KJ.

What is standard enthalpy of reaction?

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.

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The specifications that would not have to be sued to make the specification would have to be: .Leaves found in deciduous forest --- Leaves found in tropical forest Option B

Trees that drop all of their leaves annually make up the majority of a deciduous forest. Eastern North America, western Eurasia, and northeastern Asia are the three primary locations for this kind of forest. All of these regions have a winter season and a moderate environment.

These trees' leaves fall off each fall, thus the name "deciduous," which means "falling off." Wide, flat leaves are characteristic of most broad-leaved deciduous plants. As they expand, the branches of the trees generally take on a rounded form.

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answer key

1.Circular shaped leaves --- Irregular shaped leaves

2.Leaves found in deciduous forest --- Leaves found in tropical forest

3.Leaves symmetrical on stem --- Leaves asymmetrical on stem

4.Leaves bunched on stem --- Single leaf on stem

In this reaction, CuSO₄₍s₎ + 2HI₍aq₎ are reactant . Copper sulphate present in solid state and HI is present in aqueous state. Therefore, option B is correct.

Copper sulfate is used in agriculture and non-agricultural settings as a fungicide, algaecide, root killer, and herbicide. It's also an antimicrobial and a molluscicide. Individual products containing copper sulfate have a wide range of applications.

Copper and sulfuric acid are the two main ingredients used to make copper sulphate, but simply adding copper to a diluted acidic solution will not promote the oxidation reaction.

When pure copper sulphate is kept in water, it begins to dissolve, and a small amount of heat energy is released during the process. Its color changes to blue as 5 molecules of water cling to it.

Thus, option B is correct.

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Answer:

reacrans

Explanation: you are correct lol