Determine the molarity of a solution that is prepared by adding 600 mL of water to a 200 mL of 0.450 M solution of K2Cr2O7 ?

Answer:

81.5 L

Explanation:

We can use the combined gas law equation that gives the relationship among pressure, temperature and volume of gases for a fixed amount of gas.

P1V1 / T1 = P2V2 / T2

where P1 - pressure, V1 - volume and T1 - temperature at the first instance

P2 - pressure, V2 - volume and T2 - temperature at the second instance

substituting the values in the equation

1240 Torr x 47.2 L / 298 K = 730 Torr x V2 / 303 K

V2 = 81.5 L

the new volume the gas would occupy when the conditions have changed is 81.5 L

The problem involves using the ideal gas law to find the volume of oxygen gas under different conditions of temperature and pressure. The initial volume of 47.2 liters at 1240 torr and 298K changes to approximately 79.4 liters when the conditions are changed to 730 torr and 303K.

The subject of this question is the application of the ideal gas law, an equation used in physics and chemistry to calculate the properties of gases. The gas law equation is PV = nRT, where 'P' is the pressure, 'V' is the volume, 'n' is the number of moles, 'R' is the gas constant, and 'T' is the temperature. However, since the number of moles and the gas constant doesn't change in our problem, we can simplify it to P1*V1/T1 = P2*V2/T2. This equation is used to solve problems involving changes in pressure, volume, and temperature for a gas.

Given conditions: P1 = 1240 torr, V1 = 47.2 L, T1 = 298K; Required conditions: P2 = 730 torr, T2 = 303K. The volume V2 under the required conditions can be calculated by rearranging the formula to V2 = P1*V1*T2/(P2*T1).

Therefore, if you substitute the corresponding numbers into the formula, you will get V2 = 1240 torr * 47.2 L * 303K / (730 torr * 298K) which results in approximately 79.4 liters.

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Answer:

Dihydrate.

Explanation:

It comprises 2 molecules of H2O (water). This is the correct answer to this question.

Hope this helps!!!

Kyle.

Answer:

[tex]\boxed{\text{-862 kJ/mol}}[/tex]

Explanation:

One way to calculate the lattice energy is to use Hess's Law.

The lattice energy U is the energy released when the gaseous ions combine to form a solid ionic crystal:

Li⁺(g) + Cl⁻(g) ⟶ LiCl(s); U = ?

We must generate this reaction rom the equations given.

(1)  Li(s) + ½Cl₂ (g) ⟶ LiCl(s);      ΔHf°     = -409 kJ·mol⁻¹

(2) Li(s) ⟶ Li(g);                          ΔHsub =    161 kJ·mol⁻¹

(3) Cl₂(g) ⟶ 2Cl(g)                     BE        =   243 kJ·mol⁻¹

(4) Li(g) ⟶Li⁺(g) +e⁻                   IE₁         =   520 kJ·mol⁻¹

(5) Cl(g) + e⁻ ⟶ Cl⁻(g)                EA₁       =  -349 kJ·mol⁻¹

Now, we put these equations together to get the lattice energy.

                                                E/kJ  

(5) Li⁺(g) +e⁻ ⟶ Li(g)                520

(6) Li(g) ⟶ Li(s)                         -161

(7) Li(s) + ½Cl₂(g) ⟶ LiCl(s)     -409

(8) Cl(g) ⟶ ½Cl₂(g)                   -121.5

(9) Cl⁻(g) ⟶ Cl(g) + e⁻               +349

      Li⁺(g) +  Cl⁻(g) ⟶ LiCl(s)     -862

The lattice energy of LiCl is [tex]\boxed{\textbf{-862 kJ/mol}}[/tex].

Using the Born-Haber cycle and the provided thermodynamic data, the lattice energy of LiCl is calculated to be -1282 kJ/mol.

The lattice energy of a compound is the energy required to break apart the compound into its constituent ions. It can be calculated using Born-Haber cycle, Hess’s Law and the given thermodynamic data.

ΔH°f[LiCl(s)] = Bond energy [Cl-Cl] + IE1 (Li) - EA1 (Cl) + ΔH°sublimation [Li] + Lattice energy

So, solving for Lattice Energy gives: Lattice energy = ΔH°f[LiCl(s)] - Bond energy [Cl-Cl] - IE1 (Li) + EA1 (Cl) - ΔH°sublimation [Li].

Substituting in the provided values gives: Lattice energy = -409 kJ/mol - 243 kJ/mol - 520 kJ/mol + (-349 kJ/mol) - 161 kJ/mol = -1282 kJ/mol. Therefore, the Lattice Energy of LiCl is -1282 kJ/mol.

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The muddy water and dead fish can be due to soil erosion or sediment runoff, changes in photosynthesis due to excess organic material causing eutrophication, or changes in habitat conditions due to clear-cutting of forests.

The muddiness of the stream and the presence of dead fish could be signs of a phenomenon called soil erosion or sediment runoff. This is where heavy rain washes soil, which can contain toxins or pollutants, into a water source such as a stream. The influx of silt can make the water muddy and unhealthy for aquatic life, leading to the death of fish. Changes or disruptions in the ecosystem such as clear-cutting of forests increase the risk of this erosion since trees and vegetation help to hold the soil in place and buffer waterways.

Another possibility is the change in the stream's photosynthesis processes due to the debris and excess organic materials like leaves being washed into the stream. The increase in organic material can lead to a process called eutrophication, where the decomposition of organic material uses up oxygen in the water, thus suffocating fish and other aquatic species.

The death of fish might also be due to changes in their habitat. Clearing of trees could have changed the temperature of the water as shadows from the tree cover, which kept temperatures lower, no longer exist. Aquatic life such as leeches, trout and other species that have adapted to the previous temperature conditions of the fast-moving water may not survive in the warmer, slower moving water.

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Increased sedimentation from soil erosion due to clear-cutting and heavy rainstorms can lead to murky water, which suffocates fish and disrupts the aquatic food web by reducing visibility needed for predators to find food.

You are in a clear-cut section of forest and you notice a nearby stream is very muddy with many dead fish. This could be due to sedimentation resulting from the recent heavy rainstorm. The clear-cutting of trees can exacerbate soil erosion, leading to increased sediment in the water, which can suffocate fish by clogging their gills or destroying their habitat. This also disrupts the ecosystem, as sediment-laden water can make it difficult for predators such as waterfowl, frogs, and fishes to find food, which often depend on clearer water to hunt using visual cues or chemical cues.

The mudflows and flash flooding caused by the monsoon, further compounded by deforestation, often introduce a large amount of sediment and organic material into waterways, degrading the aquatic environment and affecting the entire aquatic food web.

I would say diamond, because it consists only of carbon

Answer:a switch

Explanation:because the electricity will go to the battery to the bell and it will make a sound

To activate the bell in the circuit, connect wire A from the battery to wire B leading to the bell, completing the circuit and allowing electric current to flow, resulting in the bell producing sound vibrations.

To make the bell sound in the circuit:

1. Connect wire A, currently attached to the battery, to wire B, which is connected to the bell.

2. This will complete the circuit and allow the electric current to flow continuously from the battery through the bell.

3. When the circuit is closed by connecting wires A and B, the electric current will pass through the bell, causing it to vibrate and produce a sound.

4. The completion of the circuit enables the electrical energy to power the bell, resulting in its functionality and the production of sound.

Answer:

104 c = 377.15 k

-3 c = 270.15 k

Answer:

Coordinate

Explanation:

It comes in a set of values (x,y) in two dimensions or (x,y,z) in three dimensions. Coordinates are useful in many applications such as tracking planes in the air and also in the military in precision strikes. GPS also used coordinates to describe the location of a particular feature.

In physics, position refers to the location of an object, described relative to a frame of reference. Displacement is the change in position and includes both the straight line distance and the direction of motion. Understanding these concepts is key to studying the motion of objects.

Position

To describe the motion of an object, you must first be able to describe its position (x): where it is at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, or other reference frames in motion relative to Earth. The displacement of an object is the change in its position, which includes the straight line distance and the direction of its motion between initial and final positions.

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Answer:

3.0 mol.

Explanation:

Molaity (m) is defined as the no. of moles of solute per kg of solvent.

m = (no. of moles of solute Ca(NO₃)₂)/(kg of solvent).

∴ no. of moles of solute Ca(NO₃)₂ = (m)(kg of solvent) = (3.0 m)(1.0 kg) = 3.0 mol.

Nitrogen has an electronegativity of 3.0 whereas hydrogen is 2.1 based on the Pauling scale. Therefore nitrogen is very electronegative and more electronegative than hydrogen

Electronegativity difference of N and H is 0.9

Covalent

A nuclear energy is the answer

The diagram above depicts an energy releasing process involving the uranium atom,Nuclear energy is the form of energy that the process depict.

Nuclear energy is the form of energy that depict from the time of above mentioned process.

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The enthalpy change for the overall reaction  is 999 kJ.

To find the enthalpy change for the overall reaction [tex]PCl_{5}[/tex](g) → [tex]PCl_{3}[/tex](g) + [tex]Cl_{2}[/tex](g), we need to combine the given intermediate equations.

The first equation is: [tex]P_{4}[/tex](s) + 6 [tex]Cl_{2}[/tex](g) → 4 [tex]PCl_{3}[/tex](g), with an enthalpy change of Δ[tex]H_{1}[/tex] = -2,439 kJ.

The second equation is: 4 [tex]PCl_{6}[/tex](g) → [tex]P_{4}[/tex](s) + 10 [tex]Cl_{2}[/tex](g), with an enthalpy change of Δ[tex]H_{2}[/tex] = 3,438 kJ.

By reversing the first equation and multiplying the second equation by 4, we can cancel out [tex]P_{4}[/tex] (s) and [tex]Cl_{2}[/tex] (g) to obtain the overall reaction: [tex]PCl_{5}[/tex](g) → [tex]PCl_{3}[/tex](g) + [tex]Cl_{2}[/tex](g).

Since enthalpy change is a state function, we can sum up the enthalpy changes of the intermediate reactions to calculate the enthalpy change for the overall reaction:

Δ[tex]H_{overall}[/tex] = -2,439 kJ + 3,438 kJ = 999 kJ

Answer:

Explanation:

increased levels of carbon dioxide from burning fossil fuels

Fossil fuels release carbon dioxide into the atmosphere. The burning of fossils shoots up carbon emission and leads to gloabl warming.

Carbondioxide is one of the greenhouse gases. Others are methane, water vapour.

Incoming radiation that reaches the surface can either be reflected or be absorbed on the earth surface. The part that is absorbed helps keep surface temperature in check. The reflected component of the radiation can get trapped when they come in contact with greenhouse gases like carbondioxie. The gas prevents the radiation from escaping the earth.

As the radiation lingers, it shoots up the earth temperature significantly.

The more the gases in the atmosphere the more the temperature rises.

Carbondioxide emission from various sources, chief of which is through burning of fossil fuels in industrial processes and automobiles have become a global problem.

When the earth warms, polar ice would recede and add more water to hydrosphere. This has been one of the leading cause of the increasing level of inundation the earth has been plagued with over the years.

Answer:

The electrons that participate in chemical bonds are the valence electrons, which are the electrons found in an atom 's outermost shell.

Explanation:

Chemical bonding involves valence electrons, the electrons in an atom's outermost shell. There are two main types of bonds: ionic, which involves electron transfer, and covalent, which involves electron sharing.

In the context of chemical bonding, the electrons involved are the ones located in the outermost shell of an atom, called the valence electrons. An atom's chemical behavior and its propensity to form bonds are determined by its valence electrons. There are two main types of chemical bonds: ionic bonds and covalent bonds.

In ionic bonding, electrons are transferred from one atom (turning it into a positively charged ion, or cation) to another (turning it into a negatively charged ion, or anion). This results in an electrostatic attraction between the ions, forming an ionic bond.

Covalent bonding, on the other hand, involves the sharing of valence electrons between atoms. This can result in single, double, or triple bonds based on how many electron pairs are shared: two electrons for a single bond, four for a double bond, and six for a triple bond.

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Answer:

True

Explanation:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate.

Waves that require medium through which to travel are “electromagnetic waves”? Yes this is “TRUE”

a solution is two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (ex: sugar). The solvent is the one doing the dissolving (ex: water).

i learned this in science last year i hope this helped :)

Answer: A solution is made when one substance called the solute “dissolves” into another substance called the solvent.

Explanation:

Dissolving is when the solute breaks up from a larger crystal of molecules into much smaller groups or individual molecules. They do this by pulling away the ions and then surrounding the salt molecules.

Answer:

False

Explanation:

An explosive occurs when Gases expands. Therefore, option A is correct.

The term an explosion is defined as the rapid increase in volume and release of energy extremely.

An incendiary device or a chemical reaction that results in the rapid expansion of gas causes an explosion.

A very loud sound or a succession of noises and sensations, fire, heat, smoke, falling glass, or debris can all be indicators of an explosion.

Three general energy deposition techniques can lead to high explosive reactions, impact ignition by frictional and/or shear heating, bulk thermal heating and shock compression.

When there is a gas leak and a spark or flame are present, a gas explosion happens. Because they are frequently used for heating, gases including natural gas, methane, propane, and butane are the most frequent types of gases to cause explosions.

Thus, option A is correct.

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Answer:

2

Explanation:

A salt is an ionic compound produced from the combination of a cation from a base and an anion from an acid, often during a neutralization reaction.

A salt is an ionic compound formed when an acid and a base neutralize each other. This chemical reaction typically produces a salt and water as products. In the reaction, a positive ion or cation from the base combines with a negative ion or anion from the acid. An example of this process is the formation of sodium chloride (NaCl), where sodium ions (Na+) from sodium hydroxide (NaOH) react with chloride ions (Cl-) from hydrochloric acid (HCl), resulting in table salt, NaCl.

The general equation for a reaction between an acid and a base is: acid + base → water + salt
Salts can be formed from these reactions even if the solution is not neutral; they can be either acidic or basic, depending on the strengths of the original acid and base. It's noteworthy that the term neutralization reaction is often used to describe the process, as it typically involves the neutralization of the acid and base properties.

Answer:

When excited electrons fall to lower energy levels, they can release energy in the form of light. metal ions in the salts used in the flame tests.

Answer:

463.0 g.

Explanation:

n = mass/molar mass.

where, n is the mass of copper(ii) fluoride​ (m = 4.56 mol),

mass of copper(ii) fluoride​ = ??? g.

molar mass of copper(ii) fluoride​ = 101.543 g/mol.

∴ mass of copper(ii) fluoride​ = (n)(molar mass) = (4.56 mol)(101.543 g/mol) = 463.0 g.

Answer:

fluorine

Explanation:

fluorine is considered the most electronegative element

Final answer:

The correct answer is "flourine". The most electronegative element is fluorine due to its position at the top right of the periodic table and its electron configuration which is one electron short of a full octet.

Explanation:

The most electronegative element is fluorine. Electronegativity is a measure of an atom's ability to attract and hold onto electrons. In the periodic table, electronegativity increases as you move from left to right across a period and decreases as you move down a group. Therefore, fluorine, which is positioned at the top right of the periodic table (aside from the noble gases), exhibits the highest electronegativity.

Fluorine's high electronegativity is attributed to its atomic electron configuration of 1s² 2s² 2p⁵, making it one electron short of a full octet. This drives its strong tendency to gain electrons from other elements, making it a very strong oxidizing agent. In comparison, hydrogen, while being more electronegative than many other elements, such as carbon, does not approach the electronegativity of fluorine.

Thus, the correct answer to the question is B. fluorine.

Red color passes through the atmosphere and refracts toward the moon

What light color passes through the atmosphere and refracts toward the moon?

Red light color passes through the atmosphere and refracts toward the moon.

The straight red arrow passing from the surface through the atmosphere represents the fraction of the emitted infrared radiation that passes into space through the atmosphere without change. Red-colored light  is scattered very little. However it is refracted or bent inward towards the Moon. Red light that hits the Moon is reflected back toward Earth, therefore we see the Moon glowing red during totality.

Red is the color at the end of the visible spectrum of light. It is next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. Red is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan.

Hope it helps!

Grade:  9

Subject:  chemistry

Chapter:  color

Keywords:  the atmosphere, the moon, light color, refracts, Orange

Answer:

C. RED

Just took the test and got it right.

Explanation:

Answer:warm

Explanation: because it is in the southern hemisphere so in the winter while the northern hemisphere is in a cold winter the southern hemisphere is in a warm winter due to it being in the southern hemisphere where temperatures are really warm in the southern hemisphere.

Answer:the answer is warm

Explanation:

neutrons released during a fission reaction cause other nuclei to split. If this is an option

Answer:

A, Neutrons released during a fusion reaction cause other nuclei to fuse.

Explanation:

The neutron released in the nuclear reaction collides with other nuclei, and so on and so forth.

Answer:

C.) Jupiter

LOL ^_^

Explanation:

Answer: C) Jupiter

Explanation:

Answer:

The atomic radius of krypton is similar to that of bromine. However, the effective nuclear charge of krypton is greater than that of bromine.

Explanation:

Ionizing an atom require moving an electron from the electron cloud of the atom to a point infinitely far away from the atom. The first ionization energy of this atom is the energy change in this process.

The electron and the nucleus are oppositely-charged. There is an electrostatic force between the two. Removing the electron requires overcoming this attraction. The size of the energy input depends on the electrostatic potential energy of the electron (the gravitational potential energy is much smaller than the electrostatic potential energy.) The separation between the electron and the nucleus is much larger than their radii. Both objects can be considered as point charges. Coulomb's Law gives the electrostatic potential energy of the two point charge that are close to each other.

[tex]\displaystyle \text{Electrostatic Potential Energy} = -\frac{k\cdot (q_1\cdot q_2)}{r}[/tex],

where

Krypton and bromine are right next to each other in the same period. Their atomic radii will be similar to each other. The separation [tex]r[/tex] between the outermost electron and the nucleus will also be similar for the two elements.

The first charge [tex]q_1[/tex] can be the electron. However, data show that for elements after helium, the second charge [tex]q_2[/tex] is smaller than the sum of charges on all protons in the nucleus. It turns out that the inner shell electrons (all of which are also negative) repel electrons in the outermost valence shell. The effective nuclear charge [tex]Z_\text{eff}[/tex] of a neutral atom is approximately the same as the number of protons minus the number of non-valence electrons. That number will be slightly larger for krypton than for bromine. As a result, the electrostatic potential energy on a 4p (the outermost orbital for both Kr and Br) electron of krypton will be more negative than that on a 4p electron in bromine. Removing that electron will take more energy in Kr than in Br. The first ionization energy of Kr is hence greater than that of Br.

Answer:

because if krypton has more protons, therefore it has a greater nuclear charge so the electron is harder to remove.

Explanation:

Answer:

radiation

Explanation:

Heat transfer is the process of propagating heat in different media. Three types of heat transfer are known: conduction, convection and radiation

The transfer by radiation is given at a distance. In fact, at any distance, as long as there is nothing that absorbs that energy along the way, and does not need a means to propagate.

Answer:

Equilibrium constant expression is the ratio of product of concentration of products and product of concentration of reactants.

Here K= [CO2]/[O2]

Note: Solids won't contribute to equilibrium constant expression since their activity is always one.

Answer:

B.)

Explanation: