4. What is the Osmotic Pressure of a 2. 36 Molar Cr(NO3), solution at 293 K? R = 0. 0821

5. What is the number of ions in solution if 2 molecules of Cr(NO3), completely dissociate?

6. What is the molarity of a solution if 300 grams of Cr(NO3), are dissolved in enough water to bring the

solution up to 250 milliliters?

Answer:

A. any nucleus.

Explanation:

Let's remember the concepts of strong nuclear force and electrostatic force:

- Strong nuclear force: is the force that keeps the nuclei together (protons and neutrons together).

- Electrostatic force: is the attractive and repulsive forces between particles due to electric charges (positive and negative charges).

We have to take into account that the strong nuclear force is the strongest fundamental force in nature, so this means that the strong nuclear force is greater than the electrostatic force.

Thus, based on this logic, the answer would be that any nucleus has a strong nuclear force that is greater than the electrostatic force, so the answer is A. any nucleus.

Given what we know, we can confirm that when forming an expanded octet, selenium hexafluo ride will hold 6 pairs of shared electrons around its center selenium atom.

Therefore, given that during an expanded octet formation, the central atom is capable of holding more than 8 valence electrons in its outer shell, the central atom of a selenium hexafluo ride compound will have 12 electrons being shared, which results in 6 pairs, making C the correct answer.

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1) The theoretical yield is 18.02 g

2) The percent yield is 67%

3) The percent yield is  55.8 %

The balanced reaction equation is;

N2 + 3H2 ----> 2NH3

Number of moles of N2 = 15g/28 g/mol = 0.53 moles

If 1 moles of N2 produced 2 moles of NH3

0.53 moles of N2 will produce 0.53 * 2/1

= 1.06 moles

Theoretical yield = 1.06 moles * 17 g/mol

= 18.02 g

The percent yield = 12.1/18.02 * 100/1

= 67%

The percent yield = 19.8 g/35.5 g * 100/1

= 55.8 % as shown

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Answer:

1171.12 mL

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (milliliters)

V2 = final volume (milliliters)

T1 = initial temperature (Kelvin)

T2 = final temperature (Kelvin)

According to the information provided in this question:

P1 = 300 mmHg

P2 = 140 mmHg

V1 = 400 mL

V2 = ?

T1 = 0°C = 273K

T2 = 100°C = 100 + 273 = 373K

Using P1V1/T1 = P2V2/T2

300 × 400/273 = 140 × V2/373

120000/273 = 140V2/373

120000 × 373 = 273 × 140V2

44760000 = 38220V2

V2 = 44760000 ÷ 38220

V2 = 1171.115

The new volume is 1171.12 mL

Answer:

Explanation:

Limitation of Lewis concept: -This fails to explain the cause of covalent bond formation and the nature of attractive force between the adjacent atoms in molecules likeH2,Cl2. -Fails to explain the geometry of a molecule. -It could not explain the release of energy during formation of covalent bonds.

When q > k, the amount of the products must decrease and the amount of the reactants must increase until equilibrium is established. The reaction will proceed toward the reactants

In a reversible chemical reaction, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. When a chemical reaction is reversible, the products react with the original reactants as soon as they are created.

There is no net change in the quantity of the chemicals involved when the two opposing reactions are in equilibrium because they are occurring at identical rates, or velocities. At this point, the reaction may be deemed to be finished, meaning that the maximum amount of reactants to products has been converted under the given reaction conditions. It is possible to formulate the equilibrium conditions quantitatively.

For example, for the reversible reaction A ⇋ B + C, the velocity of the reaction to the right, \(r_{1}\), is given by the mathematical expression (based on the law of mass action) \(r_{1}\)= \(k_{1}\)(A), where \(k_{1}\) is the reaction-rate constant and the symbol in parentheses represents the concentration of A. The velocity of the reaction to the left, \(r_{2}\), is \(r_{2}\)= \(k_{2}\)(B)(C). At equilibrium, \(r_{1}\)= \(r_{2}\), therefore:

\(k_{1}(A)_{e} = k_{2} (B)_{e} (C)_{e}\)  or

\(k_{1}/k_{2} = (B)_{e} (C)_{e}/(A)_{e}=K\)

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Answer:

There are no options but the question can be answered based on general understanding of experimentation.

Group A: Control group

Group B: Experimental group

Explanation:

In an experiment, there are two groups viz: the control group and the experimental group. A control group is the group that does not receive any experimental treatment. It is considered the normal group while the experimental group is the group that is subjected to experimental treatment.

N.B: The experimental treatment in this case is the "Oxygen level"

According to the question, out of 20 petri-dishes used to grow bacteria, half (10) of the petri-dishes were placed in a container with normal atmosphere while the other 10 petri-dishes were placed in another container that have double the normal oxygen level. The first group of bacteria labelled GROUP A are the CONTROL GROUP because they were not given any treatment i.e placed under normal conditions while GROUP B are the EXPERIMENTAL GROUP because they are the group that received the experimental treatment (increased oxygen level).

Answer:

if ur here for the coffee one its between cola and acid rain

Explanation:

ur mom

Answer:0.19m

Explanation:

Molality (m) of the solution is  = 0.192 mol/kg. Molality (also molal concentration) is represented by symbol m, it measures the number of moles of solute (here a non-electrolyte solute A) present  in 1 kg of solvent. Here, moles of solute can be calculated by dividing given mass of non-electrolyte A with molecular weight of A.

Molecular mass of non-electrolyte A = 60g

Mass of non-electrolyte A = 6g

Volume of solution = 500mL

Density of solution = 1.05g

To calculate molality of solution using formula of molality:

Molality = moles of solute / kilograms of solvent (mol/kg). Here we need to calculate mass of the solvent in kg that is not directly given in the question. Hence, it is required to calculate mass of the solution first and then subtract the mass of solute from it. Also, to calculate the mass of solution, density and volume are given. So, the calculations are done as follows;

Firstly,

To calculate mass of solution using formula of density; D (ρ) = mass/volume. Density (ρ) is the mass of substance divide by it's volume. Therefore, Mass of solution = Density  × volume

Mass of solution = 1.05 × 500

Mass of solution = 525 g

Now, Mass of solvent is calculated as Mass of solute (non-electrolyte A) subtracted from mass of solution. Therefore,

Mass of solvent = 525 - 6 = 519 g (0.519 kg)

Moles of solute are calculated as given weight of solute divided by molecular weight of solute. Hence, moles of solute = 6/60

Moles of solute = 0.1

Molality of solution is calculated as moles of solute divided by mass of solvent or kilograms of solvent (mol/kg)

Molality of solution = 0.1/ 0.519

Molality (m) = 0.192 mol/kg

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The best statement that describes John Dalton’s use of creativity is that He recorded his results as four parts of the atomic theory, option C.

John Dalton was an English chemist and physicist who lived in the late 18th and early 19th centuries. He is best known for his pioneering work in atomic theory, which he formulated in the early 19th century. According to Dalton's theory, matter is composed of tiny indivisible particles called atoms, which can combine to form molecules.

John Dalton recorded his results as four parts of the atomic theory to describe the fundamental nature of matter. He proposed that all elements are made of tiny indivisible particles called atoms, which are unique to each element.

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Answer:

1 is an element

2 is a compound

3 is a mixture

Explanation:

One consists of only one type of material

two has two particles chemically bound together

three is a heterogeneous mixture which means they do not have a constant and uniform apperrance and composition

Answer:

B

Explanation:

Ne has 10 electrons.

so the first shell will takes 2 (10-2=8)

the second shell will take 8 (8-8=0)

Technetium-99m is a radioisotope that is widely used in nuclear medicine for various imaging studies. It is usually produced through a process called generator system from the decay of its parent isotope, Molybdenum-99 (Mo-99).

How technetium-99m is generated:Technetium-99m is generated by a process called a generator system from the decay of its parent isotope, Molybdenum-99 (Mo-99). This generator system is essentially a column packed with a gel-like substance, which is usually made of alumina, silica, or another material. The column contains Mo-99, which is produced in a nuclear reactor, and its daughter isotope Technetium-99m (Tc-99m).The Mo-99 decays into Tc-99m by beta decay, emitting a beta particle and a neutrino.

As a result, Tc-99m is separated from Mo-99 by using a saline solution or another eluant to flush the column. The Tc-99m-containing eluant is then used for imaging studies.There are several advantages to using Tc-99m for imaging studies. It has a short half-life of only six hours, which means that it does not stay in the body for a long time and is eliminated quickly. This makes it safer for patients than isotopes with longer half-lives. Additionally, Tc-99m emits gamma rays, which can be detected by imaging equipment such as gamma cameras. This allows for high-quality imaging studies that can help diagnose a wide range of medical conditions.

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Answer:

Mg

Explanation:

Mg forms 2+ ions and mgcl2 has a melting point over 700°C I believe.

ANSWER

EXPLANATION

Firstly, we need to define the word titration.

Titration is defined as a technique that is used to determine the known concentration of an unknown solution.

This normally occurs between an acid and a base

During titration, an indicator changes color when equilibrium has been attained between the two solutions. The solutions are normally acid and base. At equilibrium, the number of moles of acid is equal to the number of base.

Therefore, the correct answer is option C

According to Wegener's hypothesis of continental drift, evidence led from the theory of continental drift the theory of plate tectonics are the distribution of ancient fossils, rocks, and mountain ranges and  perfect fitting of continents.

The theory of continental drift suggests that the Earth's continents were once joined together in a single landmass called Pangaea, which began to break apart around 200 million years ago and has been drifting apart ever since. The theory was first proposed by German geophysicist Alfred Wegener in 1912, but it was not widely accepted until the 1960s when evidence from the ocean floor supported the idea.

Wegener based his theory on several lines of evidence, including the similarities in the shape of the coastlines of continents on opposite sides of the Atlantic Ocean, the distribution of fossils and rock formations on different continents, and the patterns of glaciation during the Earth's history. He suggested that the continents moved apart due to the movement of the Earth's crust, which he called continental drift.

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Answer:

C would be the answer

Explanation:

Answer:

Shampoo

Explanation:

Its a homo mixture because if you look at the way it is mixed you will

know it is a homogeneous mixture

a mushroom

Explanation:

it don't make sense because the tree is not food chain

Answer:

they are both primary producers so i would say they are at the same level, hope this helps

We must first convert the amount of atoms of helium to moles in order to solve this issue. This much helium gas can be used by Ngawang to fill about 14 balloons at STP.

Along with liquids, solids, and plasmas, gases are among the four basic states of matter. Gases are made up of atoms or molecules that are constantly moving and spaced far apart from one another. Gases, in contrast to solids and liquids, do not have a set shape or volume and always fill their container to the top.

In addition to other characteristics like density, viscosity, and compressibility, gases can be classified according to their volume, pressure, and temperature. Additionally, they can change physically and chemically through processes including expansion, compression.

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If you wanted to find a sample of fermium,which has an atomic mass of 100 I would look deep under the earth

Answer: 31.5L

Explanation:

Ideal gas law is valid only for ideal gas not for vanderwaal gas. The equation used is PV=nRT. Therefore the volume of oxygen gas is 31.5L.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of oxygen gas =78.5 kPa=78,500=0.7747atm

V= volume of oxygen gas=?

n =number of moles of oxygen gas = given mass÷ Molar mass

                                                          = 32.0g÷ 32

                                                          =1 mole

T =temperature of oxygen gas=298K

R = Gas constant = 0.0821 L.atm/K.mol

0.7747atm×V=1 mole×0.0821×298K

V=31.5L

Therefore the volume of oxygen gas is 31.5L.

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The discrepancy between the dyes' molecular weights and the distances they traveled on the gel might be explained by the differences in the size, shape, and charge of the dyes.

Gel electrophoresis is a technique used to separate molecules based on their size and charge. In this process, the molecules are subjected to an electric field and migrate through the gel matrix towards the opposite end of the gel. The rate of migration depends on the size, shape, and charge of the molecules.

In the case of dyes, the molecular weight is an important factor in determining the rate of migration. However, other factors such as the size, shape, and charge of the dyes can also play a role in the migration.

For example, larger dyes may move slower than smaller dyes through the gel matrix, despite having a higher molecular weight. This is because larger molecules experience more frictional resistance within the gel matrix and therefore migrate slower. Similarly, dyes with a more elongated or irregular shape may migrate differently than more compact molecules, despite having the same molecular weight.

Additionally, the charge of the dyes can also impact their migration through the gel. Dyes with a higher net charge will migrate faster due to their increased interaction with the electric field. This highlights the fact that the migration rate of a molecule depends more on its shape, charge, and size than solely on its molecular weight.

In conclusion, differences in size, shape, and charge of the dyes can affect how they migrate during gel electrophoresis, leading to a discrepancy between their molecular weights and the distances they travel on the gel. Therefore, when interpreting the results of gel electrophoresis, it is important to consider the size, shape, and charge of the molecules being analyzed, in addition to their molecular weight.

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Answer:

The second choice.

Explanation:

The products often have completely different properties than the reactants.

The first and third are wrong because matter is always preserved in a chemical reaction.

The last is not true.

The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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Answer:

The 2 types of behavioral adaptation are migration, and hibernation. Explanation: Adaptation of animal is the fitness towards its environment.

Explanation:

The command that allows moving a file from one location to another is the "mv command".

The mv command renames or transfers files and folders from one directory to another. A file or directory keeps its base file name when moved to a new directory. All links to other files are preserved when you transfer a file, with the exception of when you move it to a different file system. A directory and its contents are added beneath the existing directory when you transfer a directory into it.

The TargetDirectory option of the mv command allows you to provide a new file name or a new directory path name when renaming a file or directory.

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Answer:

Option C

Explanation:

The new method must support the law of definite proportions which means that if one mole of compound is distributed percentage wise then the sum of % share of each element must be equal to one mole of compound and this percentage distribution always remains the same in all conditions

Hence, option C is correct

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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