You need to make an aqueous solution of 0.170 m iron(ii) chloride for an experiment in lab, using a 300 ml volumetric flask. how much solid iron(ii) chloride should you add?

The formal charges on each of the nitrogen atoms in the N3- ion shown are:

- Middle nitrogen atom: 0

- End nitrogen atoms: -1 (x²)

To calculate the formal charges on each of the nitrogen atoms in the N3- ion shown, we need to first determine the valence electrons of nitrogen. Nitrogen has five valence electrons, so in the N3- ion, there are a total of 15 valence electrons (5 valence electrons per nitrogen atom).

To calculate the formal charge, we need to subtract the number of non-bonded electrons (lone pairs) and half of the bonded electrons from the valence electrons of each nitrogen atom.

For the middle nitrogen atom, it has four non-bonded electrons and two bonded electrons, giving it a formal charge of 0.

For the two end nitrogen atoms, they each have two non-bonded electrons and four bonded electrons, giving them a formal charge of -1.

Overall, the N3- ion has a charge of -3, which is the sum of the formal charges on each nitrogen atom.

In summary, the formal charges on each of the nitrogen atoms in the N3- ion shown are:

- Middle nitrogen atom: 0

- End nitrogen atoms: -1 (x²)

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Answer: to protect giant pandas

Explanation:

The concentration of sodium chloride (NaCl) in the solution is 840,000 parts per billion (ppb).

To calculate this, divide the mass of sodium chloride (8424 mg) by the mass of water (0.1711 kg), then multiply the result by 1 billion (10^9).

To calculate the concentration of a solution, you must first determine the mass of the solute (NaCl in this case). The mass of the solute is given in the question as 8424 mg.

The mass of the solvent (water) is given as 0.1711 kg.

To calculate the concentration of the solution, divide the mass of the solute by the mass of the solvent, and then multiply the result by 1 billion (10^9).

In this example, 8424 mg divided by 0.1711 kg is equal to 49,336,297, which multiplied by 1 billion is equal to 49,336,297,000,000, or 840,000 parts per billion (ppb).

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Sodium has more protons, neutrons, and electrons than Lithium.

The nuclei of atoms consist of protons and neutrons. Both component form the bulk of the mass of atoms.

Outside the nucleus, electrons are found in the orbitals surrounding the nucleus.

The atomic number of an atom is the number of protons in the nucleus of the atom. For neutral atoms, the number of protons and electrons is the same.

The atomic number of Lithium is 2, while that of Sodium is 11. This means Lithium has 2 protons while sodium has 11.

The atomic mass of Lithium is 7 while that of sodium is 23. This means that sodium has more neutrons than lithium.

Thus, sodium has more neutrons, electrons, and protons, than lithium.

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Answer:

There are three factors that help in the prediction of the trends in the periodic table: number of protons in the nucleus, number of energy levels, and the shielding effect. The atomic radii increase from top to the bottom in any group. The atomic radii decrease from left to right across a period.

Explanation:

Major periodic trends include atomic radius, ionization energy, electron affinity, electronegativity, valency and metallic character. These trends exist because of the similar electronic configuration of the elements within their respective groups or periods and because of the periodic nature of the elements.

The least likely zone of formation for a large air mass is the equator. Large air masses form due to differences in temperature and pressure between different regions.

The equator is an area where temperatures are relatively consistent throughout the year and there are not significant differences in pressure systems, making it less likely for a large air mass to form. On the other hand, areas near the poles or where there are large landmasses or bodies of water can have significant differences in temperature and pressure, making them more likely to form large air masses.

Air masses typically form in regions with consistent temperature and humidity conditions, such as polar, tropical, and continental areas. The equatorial region is less likely to form large air masses because it experiences strong solar heating, high humidity, and a lot of weather variability, which prevents the development of stable, uniform air masses.
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Answer:

D

Explanation:

First, the change of state from gas to liquid is known as CONDENSATION

Then, according to kinetic theory, when gas changes to liquid, the molecules 'slow down' in their random motion and thus, their kinetic energy deceases.

Therefore, condensation is usually followed by decreasing in energy.

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 amount of oxygen necessary to react with 5.71 g of aluminum is 5.09 g of O₂ (rounded to two significant figures).

The balanced chemical equation for the reaction between aluminum and oxygen is:

4Al(s) + 3O₂(g) ⟶ 2Al₂O₃(s)

The equation shows that 3 moles of oxygen react with 4 moles of aluminum to produce 2 moles of aluminum oxide. Therefore, we can use the stoichiometry of the balanced equation to calculate the amount of oxygen required to react with a given amount of aluminum.

First, we need to calculate the number of moles of aluminum in 5.71 g of aluminum:

moles of Al = mass of Al / molar mass of Al

moles of Al = 5.71 g / 26.98 g/mol

moles of Al = 0.212 mol

Next, we can use the mole ratio from the balanced equation to calculate the number of moles of oxygen required:

moles of O₂ = (3/4) × moles of Al

moles of O₂ = (3/4) × 0.212 mol

moles of O₂ = 0.159 mol

Finally, we can convert the number of moles of oxygen to grams:

mass of O₂ = moles of O₂× molar mass of O₂

mass of O₂= 0.159 mol × 32.00 g/mol

mass of O₂ = 5.09 g

Therefore, the amount of oxygen necessary to react with 5.71 g of aluminum is 5.09 g of O₂ (rounded to two significant figures).

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The ratio of the vapor pressure of the air in equilibrium with a substance to the vapor pressure of pure water is known as Water activity.

Vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with the condensed phase at a given temperature in a closed system. Equilibrium vapor pressure is a measure of the evaporation rate of a liquid.

The relative humidity is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a specified or given temperature. The relative humidity is defined as the ratio of vapor pressure to saturated vapor pressure, expressed as a percentage. The relative humidity is always defined for a flat surface of pure liquid water. Vapor pressure is the equilibrium vapor pressure when the rate of evaporation equals the rate of condensation.

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Answer:

D. +2

Explanation:

To find charge use the formula:

Protons - Electrons = Charge

Answer:

D

Explanation:

it just is bro its general knowledge if you know what i mean,

im drinking sucky with the mafia

i got half a mill in monopoly money

SHEeSsh

25 moles of dihydrogen monoxide (H₂O) are produced from the combustion of 12.5 moles of methane (CH₄).

From the balanced chemical equation: CH₄ + 2O₂ → CO₂ + 2H₂O

We can see that for every 1 mole of methane (CH₄) that reacts, 2 moles of water (H₂O) are produced.

Given: Moles of methane (CH₄) = 12.5

To find the moles of water (H₂O) produced, we multiply the moles of methane by the stoichiometric coefficient of water in the balanced equation.

Moles of H₂O = 2 * 12.5 moles = 25 moles

Therefore, 25 moles of dihydrogen monoxide (H₂O) are produced from the combustion of 12.5 moles of methane (CH₄).

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Answer:

I am not sure this one is False.

Explanation:

Answer:

False

Explanation:

This is false because the outer part of earth is cooler than the inner. For example, the inner is filled with lava, and all kinds of stuff, so this is technically saying that the outer is much cooler, It has dirt, and dirt can be cool.

Breaking bonds in the reagents, rearranging those atoms into new groups (the products), and creating new bonds in the products are all components of a chemical reaction.

In a chemical reaction, one or more chemicals, usually known as reactants, change into one or more other compounds, frequently referred to as products. Chemical parts or chemical elements make up substances. A response is a behavior, propensity, or course of action that is different from what was first intended. Decisions are taken in the heat of the moment without much thought or consideration of the potential repercussions. Reaction: Making a declaration in response to another person's action or remark.

Changes in color, temperature, gas production, or precipitant formation are common outcomes of chemical reactions. Combustion, digestion, and cooking are a few straightforward instances of daily reactions.

Atoms create and break chemical bonds during chemical reactions. Reactants are the molecules that initiate a chemical reaction,

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You can convert qualitative data into quantitative data by creating categories and assigning numerical values to each category.

Qualitative data is non-numerical data that is collected through methods such as interviews, observations, and focus groups. While qualitative data provides rich insights, it cannot be analyzed statistically without converting it into quantitative data. To convert qualitative data into quantitative data, you need to create categories and assign numerical values to each category.

For example, if you conducted an interview and asked participants to rate their satisfaction with a product on a scale of 1-5, you could assign numerical values to each rating. 1 could represent very dissatisfied, 2 could represent somewhat dissatisfied, 3 could represent neutral, 4 could represent somewhat satisfied, and 5 could represent very satisfied. By assigning numerical values to each category, you can analyze the data statistically and draw conclusions based on numerical data.

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Answer:125ml - volume of phosphoic acid

Explanation:

The equation of the reaction is

H3PO4 + 3 NaOH ---> Na3PO4 + 3H2O

Such that I mole of H3PO4 reacts with 3 moles of  NaOH to produce the products above.

Given that

M1= Molarity of phosphoric acid = 7.48x10^-2 M

n1= number of moles of phosphoric acid = 1

V1=? ml

M2= Molarity  of Sodium hydroxide =0.244 M

V2= volume of sodium hydroxide= 115ml

n2=number of moles of sodium hydroxide = 3

Using the Dilution equation formulae,

M1V1/n1 = M2V2/n2

7.48X10-2 x V1 /1= 0.244M x 115ml/3

V1=0.244Mx115mlx1/0.0748M X 3

V1= 28.06/0.2244= 125.04ml

V1=125.04ml rounded up to 125ml

Hi there!

\(\large\boxed{2 m/s}\)

Use the equation:

d / t = s where:

d = distance (m)

t = time (s)

s = speed (m/s)

Plug in the given values into the equation:

10 / 5 = s

s = 2 m /s

Extraction is a commonly used technique in chemistry to separate or isolate specific compounds from a mixture based on their differential solubility in different solvents.

Extraction involves dissolving the mixture in a suitable solvent and then selectively extracting the desired compound into another solvent phase.

To separate p-dichlorobenzene from p-chloroaniline by extraction, the following procedure can be employed:

1. Prepare the mixture: Combine the mixture containing p-dichlorobenzene and p-chloroaniline in a suitable container.

Ensure that the compounds are thoroughly mixed.

2. Select an appropriate solvent: Choose a solvent that is selective for dissolving p-dichlorobenzene while minimizing the solubility of p-chloroaniline.

In this case, a nonpolar organic solvent such as ether or dichloromethane would be suitable.

3. Perform extraction: Add the chosen solvent to the mixture and agitate or stir the mixture for a sufficient amount of time.

This allows the solvent to extract the p-dichlorobenzene from the mixture while leaving the p-chloroaniline behind.

4. Allow phase separation: After agitation, allow the mixture to settle so that two distinct phases form: an organic phase (containing the solvent and extracted p-dichlorobenzene) and an aqueous phase (containing the remaining p-chloroaniline).

5. Collect the organic phase: Carefully separate the organic phase from the aqueous phase using a separating funnel or by decantation.

The organic phase will contain the dissolved p-dichlorobenzene.

6. Optional repeat extraction: If necessary, the extraction process can be repeated with fresh solvent to enhance the separation efficiency.

7. Evaporate the solvent: In order to obtain pure p-dichlorobenzene, the solvent can be evaporated from the collected organic phase using techniques such as rotary evaporation or simple distillation.

This process leaves behind the p-dichlorobenzene as a solid residue.

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Answer:

it is C. take it to the local automotive parts store to be recycled

Explanation:

hope this helped have a nice day!

The pH of the solution is 0.886 when 29.9 ml of 0.100M barium hydroxide is mixed with 97 ml of 0.200M hydrochloric acid.

The reaction is: \(Ba(OH)2 + 2HCl -- > BaCl2 + 2H2O\)

Given the volume of barium hydroxide = 29.9ml

The concentration of barium hydroxide = 0.100M

number of moles of barium hydroxide = \(29.9 * 0.1 * 10^{-3\) = 0.0029mol

The volume of hydrochloric acid = 97ml

The concentration of hydrochloric acid = 0.200M

number of moles of hydrochloric acid = \(97 * 0.2 * 10^{-3\) = 0.0194mol

From the reaction, we can see that 1 mole of Ba(OH)2 reacts with 2 moles of HCl. here, barium hydroxide acts as limiting reagent.

The pH of the resulting solution must be <7 because you're left with a solution that contains a strong acid. The resulting solution contains (0.0194 - 0.0029 = 0.0165 moles of HCl) H+ ions.

Total volume of the solution = 29.9 + 97 = 126.9mL

[H+] = 0.0165/126.9 = 0.13M

We can use the equation pH = -log[H+] to calculate the pH of the solution.

pH = -log(0.13) = 0.886

Therefore, the pH of the solution is 0.88.

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0.3 moles of Oxygen is excess reactant (reagent) when yield is 100% .

NO =5.6 moles

O2= 3.1 moles

2NO + O2 --> 2NO2 the chemical reaction.

the ratio of NO and O2 is 2:1

therefore for 5.6 moles of NO, 2.8 moles of Oxygen(O2) is required. So 3.1moles - 2.8 moles = 0.3 moles

The reactant in a chemical reaction that is present in a quantity that is larger than what is required to fully react with the limiting yield is known as the excess reactant. The substance(s) still present after a chemical reaction has reached equilibrium in yield are the reactant(s). Subtract the mass of excess reagent eaten from the total mass of excess reagent provided to determine the quantity of yield that is still present. Reactants in a chemical reaction are referred to as excess reagents if they are still present after the reaction is complete.

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When HCl (acid) is added to the artificial cytosol, it typically results in a decrease in pH or an increase in acidity. This is because HCl is a strong acid that dissociates completely in water, releasing hydrogen ions (H+) into the solution.

The decrease in pH caused by the addition of HCl can have several effects on the artificial cytosol. It can alter the ionization states and activities of various molecules and ions present in the cytosol. For example, enzymes and proteins that are sensitive to changes in pH may undergo conformational changes or lose their functionality in an acidic environment. Additionally, the acidity may affect the solubility and stability of certain compounds in the cytosol.

The presence of hydrogen ions increases the concentration of protons in the solution, lowering the pH value. The decrease in pH may affect the chemical reactions and processes occurring in the artificial cytosol, potentially influencing the functionality and behavior of the components within the system.

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Answer:

25.56 degrees Celsius

Explanation:

Answer:

I hope this helps, sorry if it doesnt. Not really good with chemistry, hope you have a great day/night :}

Explanation:

A mole (mol) is the amount of a substance that contains 6.02 × 10 23 representative particles of that substance.

12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 1023).

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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The acronym "MAP" stands for Modified Atmospheric Packaging as it relates to food preservation. The correct option is B.

This method involves altering the composition of gases within a package to help preserve the food.

The air inside the package is replaced with a modified gas mixture that contains a lower level of oxygen and higher levels of carbon dioxide and/or nitrogen.

This helps to slow down the growth of microorganisms and reduce oxidation, which can cause spoilage and degradation.

This method is commonly used for packaging meat, poultry, seafood, fruits, and vegetables.

By using MAP, the shelf life of these foods can be extended while maintaining their quality and freshness.

It is a widely used method in the food industry, especially for perishable products that are intended for transportation or storage.

Therefore, the correct option is B, Modified Atmospheric Packaging relates to food preservation, the acronym "MAP".

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The yield of a chemical process is being studied and the question is being asked about the expectation of yield. The possible expected outcomes are as follows:a) The yield is expected to increase.b) The yield is expected to decrease.c) The yield is expected to remain the same.d)

The yield cannot be determined without further information.The expected outcome of yield depends on various factors and cannot be generalized. These factors include the nature of the chemical process, the environment, the presence of any impurities, temperature, concentration, etc.

Therefore, to provide a more accurate answer, it is necessary to know the specifics of the chemical process that is being studied and then make a prediction based on that information. Hence, the expected yield cannot be determined without further information.

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Evaporation is the process by which a liquid converts into a gas or vapor at a temperature below its boiling point. Latent heat of fusion is the amount of heat required to convert a solid into a liquid without any change in temperature.  Steam causes more severe burning as compared to boiling water at 100°C due to the large amount of latent heat of vaporization.

On the other hand, boiling is the process by which a liquid turns into a gas or vapor at a temperature equal to or above its boiling point. In other words, when the liquid is heated to a temperature equal to or greater than its boiling point, it turns into a gas or vapor. The effect of humidity on the rate of evaporation is that if the air around the liquid is already humid, then the rate of evaporation will be slower because the air is already saturated with water molecules.
Latent heat of fusion is the amount of heat required to convert a solid into a liquid without any change in temperature. In other words, it is the amount of heat required to break the intermolecular forces between the molecules of a solid to convert it into a liquid.
Steam causes more severe burning as compared to boiling water at 100°C because steam contains a large amount of latent heat of vaporization. When steam comes in contact with the skin, it releases a large amount of latent heat of vaporization, which causes more severe burns as compared to boiling water at 100°C.

Evaporation is the process of turning a liquid into a gas or vapor at a temperature below its boiling point. Boiling, on the other hand, is the process of turning a liquid into a gas or vapor at a temperature equal to or above its boiling point. Humidity affects the rate of evaporation. Latent heat of fusion is the amount of heat required to convert a solid into a liquid. Steam causes more severe burning as compared to boiling water at 100°C due to the large amount of latent heat of vaporization.

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As the compression is carried out quasi-statically, the gas's temperature will not change during the process. The temperature of the gas is T= 60.65 K.

The temperature of the gas will remain constant during the compression process since it is being done quasi-statically.

This means that the temperature of the gas will remain constant throughout the compression process.

Since the amount of work (500 J) is given, the temperature of the gas can be determined using the equation U = (3/2)nRT, where U is the work, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Solving for T, we find that the temperature of the gas is T = (2/3)(500 J)/(0.50 mol)(8.31 J/mol K) = 60.65 K.

Complete Question:

It takes 500 J of work to compress 0.50 mol of an ideal gas quasi-statically to one-fifth its original volume. What is the temperature of the gas, assuming it remains constant during the compression?

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