pls. help for chemistry hw. ASAP

The image is not a scientific model

A scientific model is a condensed representation of a real-world occurrence that helps scientists understand and justify it. In order to make predictions or test hypotheses, scientists utilize models. They could be intellectual, mathematical, or physical.

On the other hand, a NASA image is a visual representation of a real-world item, situation, or phenomenon that has been captured by a spacecraft or telescope. Images from NASA are accurate depictions, not simplified renditions, of what was observed in space.

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Taking into account the definition of dilution, the final concentration of the solution is 0.68 M.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, and the volume of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

4.2 M× 14 mL= Cf× 86 mL

Solving:

(4.2 M× 14 mL)÷ 86 mL= Cf

0.68 M= Cf

In summary, the final concentration is 0.68 M.

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Intermolecular force connects atoms in different molecules. Intermolecular forces determine physical qualities including boiling temperature, melting point, viscosity, and surface tension.

London dispersion, dipole-dipole, and hydrogen bonding are intermolecular forces. London dispersion forces, caused by electron movement-induced dipoles, are the smallest intermolecular interactions between all atoms and molecules.

Polar molecules have greater dipole-dipole interactions than London dispersion forces. Hydrogen bonding is a specific dipole-dipole interaction between a hydrogen atom bound to an electronegative atom (N, O, or F) in one molecule and an electronegative atom in another molecule.

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Answer: The mass in grams is 290g.

Explanation: In order to find the mass you need to multiply the number of moles given by the molar mass of the compound.

You find the molar mass by adding all the atomic masses of each atom in the compound.

Since 0.75 has 2 significant figures, your final answer also needs to have 2 sig figs.

Explanation:

Only protons and electrons contribute to the charge of an atom ...NEUTRons are NEUTRal...

Protons are    + charge  

Electrons are  - charge

21 negative charges added to 17 positive charges results in

   - 4  charge

Answer:

cual es el propósito de este experimento

To convert torr to kilopascals, we can use the following conversion factors:

1 torr = 1/760 atm

1 atm = 101.325 kPa

So, we can write: 656 torr × (1/760 atm) × (101.325 kPa/atm) = 87.0 kPa

Therefore, the atmospheric pressure during hurricane Patricia was 87.0 kPa.

Certainly!

In this exercise, converting a pressure value from torr to kilopascals (kPa) is required. Torr is a common unit of pressure used in physics and chemistry, while kPa is a common unit of pressure used in engineering and other disciplines.

We may utilise a conversion factor that connects torr to kPa to carry out the conversion. We must employ the following conversion factor:

0.133322 kPa per torr

As a result, 0.133322 kPa is equal to 1 torr. A pressure value in torr may be converted to a pressure value in kPa by multiplying the torr value by the conversion factor. This enables us to eliminate the torr units and obtain a value in kPa.

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The expected temperature change would be approximately 4.32°F if 0.5-gram sample of water released 0.0501 j of heat energy.

The specific heat of a substance is the amount of heat energy required to raise the temperature of one gram of the substance by one degree Celsius. The expected temperature change can be calculated using the formula:

q = m × c × ΔT

where q is the heat energy released, m is the mass of water, c is the specific heat of water, and ΔT is the change in temperature.

Rearranging the formula to solve for ΔT, we get:

ΔT = q ÷ (m × c)

Substituting the given values, we get:

ΔT = 0.0501 J ÷ (0.5 g × 4.184 J/g°C)

ΔT ≈ 2.4°C or 4.32°F

When a substance undergoes a change in temperature, it either gains or loses heat energy.

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Using the Clausius-Clapeyron equation, we can see that the new boling point is  34.6 K.

To calculate the boiling point of argon at 1.2 atm, we can use the Clausius-Clapeyron equation, which relates the boiling point of a substance at one pressure to its boiling point at another pressure, along with the latent heat of vaporization.

The Clausius-Clapeyron equation is given as:

ln(P1/P2) = ΔHvap/R * (1/T1 - 1/T2)

where:

Given:

We can rearrange the Clausius-Clapeyron equation to solve for T2 (the boiling point at 1.2 atm):

ln(P1/P2) = ΔHvap/R * (1/T1 - 1/T2)

Rearranging further:

1/T2 = (ln(P1/P2) * R) / ΔHvap + 1/T1

Plugging in the given values:

1/T2 = (ln(1 atm / 1.2 atm) * (8.314 J/(mol*K))) / (1.57 * 10^3 J/mol) + 1/21.9 K

Simplifying:

1/T2 = -0.0624 + 0.0456 + 0.0457

1/T2 = 0.0289

T2 = 1 / 0.0289

T2 = 34.6 K

That is the new one.

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From the balanced chemical equation we can see tha the mass of water produced is 2.47 grams.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and magnesium hydroxide (Mg(OH)2) is:

2 HCl + Mg(OH)2 → MgCl2 + 2 H2O

From the equation, we can see that 2 moles of hydrochloric acid react with 1 mole of magnesium hydroxide to produce 2 moles of water. To calculate the mass of water produced, we need to determine the limiting reactant, which is the reactant that is completely consumed first and determines the amount of product formed.

First, let's calculate the number of moles of each reactant:

Mass of HCl = 5.0 g

Molar mass of HCl = 36.46 g/mol

Number of moles of HCl = 5.0 g / 36.46 g/mol = 0.137 mol

Mass of Mg(OH)2 = 24.0 g

Molar mass of Mg(OH)2 = 58.33 g/mol

Number of moles of Mg(OH)2 = 24.0 g / 58.33 g/mol = 0.411 mol

According to the balanced chemical equation, 2 moles of HCl react with 1 mole of Mg(OH)2 to produce 2 moles of water. Therefore, the stoichiometry of the reaction requires 2 moles of HCl for every 1 mole of Mg(OH)2. Since we have only 0.137 mol of HCl and 0.411 mol of Mg(OH)2, the HCl is the limiting reactant because it is completely consumed first.

The molar ratio of HCl to water is 2:2, which simplifies to 1:1. Therefore, the number of moles of water produced is also 0.137 mol.

Now, let's calculate the mass of water produced using the molar mass of water:

Molar mass of water (H2O) = 18.02 g/mol

Mass of water produced = 0.137 mol x 18.02 g/mol = 2.47 g

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The pressure of the gas in the flask, given that the temperature is reduced to -15 is 0.38 mmHg

From the question given above, the following data were obtained:

The new pressure of the gas can be obtained by using the combined gas equation as shown below:

P₁V₁ / T₁ = P₂V₂ / T₂

(0.225 × 338) / 345 = (P₂ × 150) / 258

Cross multiply

345 × 150 × P₂ = 0.225 × 338 × 258

Divide both sides by (345 × 150)

P₂ = (0.225 × 338 × 258) / (345 × 150)

P₂ = 0.38 mmHg

Thus, we can conclude the pressure of the gas is 0.38 mmHg

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Based on the values of ΔG° for the three reactions represented above, the value of ΔG° for the reaction given is −1320 kJ/molrxn. The correct option is D.

To determine the value of ΔG° for the given reaction, we can use Hess's law, which states that the change in enthalpy (ΔH) for a reaction is equal to the sum of the enthalpy changes for a series of reactions that add up to the original reaction.

The same principle applies to Gibbs free energy (ΔG), so we can use the ΔG° values for the three given reactions to calculate the ΔG° for the target reaction.

We can use Reaction 1 and Reaction 2 to obtain the following overall reaction, which is the reverse of Reaction 3:

[tex]4 NH_3(g) + 6 O_2(g) --- > 4 NO(g) + 6 H_2O(l)[/tex] ΔG° = 1010 kJ/molrxn

[tex]2 NO_2(g) + O_2(g) --- > 2 NO(g) + O_2(g)[/tex] ΔG° = -70 kJ/molrxn (reverse of Reaction 2)

Next, we can add the two reactions above to obtain:

[tex]4 NH_3(g) + 8 O_2(g) + 2 NO_2(g) --- > 4 NO(g) + 4 HNO_3(aq)[/tex] ΔG° = 940 kJ/molrxn

Finally, we can use Reaction 3 to obtain the target reaction by adding 4 HNO3(aq) and subtracting 2 H2O(l):

[tex]4 NH_3(g) + 8 O_2(g) --- > 4 HNO_3(aq) + 4 H_2O(l)[/tex] ΔG° = -170 kJ/molrxn

Therefore, the answer is (D) −1320 kJ/molrxn.

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The reaction between N2O4 and is at equilibrium at this time.2 Given by K = 0.028 is NO2. The amount of NO2 in the sample is 0.042 M.

K = [NO2] is the equilibrium expression for the reaction.²/[N₂O₄] When K and [NO2] are substituted in the equilibrium expression, we obtain 0.028 = (0.042).²/[N₂O₄]

We get at [N2O4] = 0.028/0.0422 = 0.0075 M after solving for [N2O4].

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The method that would assure random selection of a sample from the population is:

The researcher should randomly select students from among all the students in the state who are enrolled in the training program.

This method ensures that all students enrolled in the driver's education program in the state have an equal chance of being selected for the study. Random selection helps to eliminate bias and increases the likelihood that the sample is representative of the entire population.

The other options listed would not assure random selection of a sample from the population.

Selecting one high school or one city could introduce bias into the sample, as the success rate of the driver's education program may vary between different schools or cities.

Thus, selecting a random batch of students from one high school could also introduce bias into the sample, as the students selected may not be representative of all students enrolled in the driver's education program in the state.

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Depending on the pH of the solution, the surface charge of each nanocrystal, and the mixing of these two types of nanocrystals, complicated interactions may occur.

Friction is the most significant characteristic of nano metals. One of the many characteristics that make nanomaterials special is their small size. Nanomaterials can have a size up to a thousand times smaller than a human hair. The ratio of a nanoparticle's surface area to volume is very high.

Because of their distinct surface charges, these two different kinds of nanocrystals may exhibit electrostatic attraction or repulsion when combined in different pH environments. Positively charged nanocrystals with carboxylic acid caps may draw negatively charged ones with amine caps when the pH is low. The carboxylic acid-capped nanocrystals have a greater negatively charged surface charge when the pH rises, which may cause them to reject one another. The amine-capped nanocrystals, on the other hand, have a higher positive change in surface charge, which could cause them to attract.

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The amount of dissolved oxygen in water may decrease because of the decrease in temperature of water. therefore, the correct option is option C.

Remember the adage "like dissolves like." This indicates that for substances to form solutions, their intermolecular forces must be comparable. When a water-soluble solute is added to a solvent, the solute and solvent particles may come into contact.

When a liquid or solid solute is present, the interactions among the solute and solvent particles become so powerful that the individual particles of solute split from one another and enter the solution encircled by solvent molecules. The amount of dissolved oxygen in water may decrease because of the decrease in temperature of water.

Therefore, the correct option is option C.

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Answer: The molarity of the solution is 0.11 M.

Explanation: You first need to convert 65g of KCl to moles of KCl. When you do that you will get 0.871898055 moles of KCl, round anykind of answers you get at the end.

The second step is to use the molarity formula to find the molarity of the solution. Molarity = moles/liters

Molarity = 0.871898055 moles of KCl / 8.3 Liters of solution

M = 0.11

Make sure that your answer always has the correct number of significant figures. In the question both numbers given to you have 2 sig figs, therefore your final answer also needs to have 2 sig figs.

To calculate the volume of water needed to create a 0.450 M solution of Al(NO3)3, we need to use the formula:

Molarity = moles of solute / volume of solution in liters

First, we need to determine the number of moles of Al(NO3)3 we have:

moles of Al(NO3)3 = mass / molar mass

molar mass of Al(NO3)3 = 1 x atomic mass of Al + 3 x atomic mass of N + 9 x atomic mass of O = 1 x 26.98 + 3 x 14.01 + 9 x 16.00 = 212.99 g/mol

moles of Al(NO3)3 = 41.6 g / 212.99 g/mol = 0.195 mol

Next, we can rearrange the formula above to solve for the volume of solution:

volume of solution = moles of solute / molarity

volume of solution = 0.195 mol / 0.450 M = 0.433 L

Therefore, we need to add 0.433 L (or 433 mL) of water to 41.6 g of Al(NO3)3 to create a 0.450 M solution.

The stoichiometric ratio of NaHCO₃ to CH₃COOH, which is determined by the balancing equation, is 1:1, meaning that 1 mole of NaHCO₃ reacts with 1 mole of CH₃COOH.

Acetic acid (CH₃COOH), a component of vinegar, interacts with sodium bicarbonate (NaHCO₃) in baking soda to produce water, carbon dioxide gas, and sodium acetate.

CO₂(g) + H₂O(l) + NaC₂H₃O₂ = NaHCO₃(aq) + HC₂H₃O₂(aq) when yellow bubbles appear, an acidic gas H₂CO₃ has generated as a result of the reaction between CO₂ and water. The salt in the solution (NaC₂H₃O₂) is basic since the solution is red in colour.

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Okay, let's solve this step-by-step:

1) The standard reduction potentials for Cu2+/Cu are: E°Cu2+/Cu = +0.34 V.

This is the reduction potential when [Cu2+] = 1 M and [Cu] = 1 M.

2) The actual reduction potential (Ered) depends on the concentrations of oxidized and reduced species.

Here,

[Cu2+] = 4.48 M on the right side.

[Cu2+] = 0.0032 M on the left side.

3) Ered = E° + 0.0591 log([oxidized]/[reduced]) (Nernst equation)

So for the right side:

Ered = +0.34 + 0.0591 log(4.48/1) = +0.34 + 0.186 = +0.526 V

And for the left side:

Ered = +0.34 + 0.0591 log(0.0032/1) = +0.34 - 0.093 = +0.247 V

4) The cell potential (Ecell) is the difference between the two half-cell potentials:

Ecell = +0.526 - 0.247 = +0.279 V

So the cell potential for the given reaction at 25°C is +0.279 V.

Let me know if you have any other questions!

Answer:

The solar system formed from a cloud of gas and dust, known as the solar nebula, that collapsed under its own gravity about 4.6 billion years ago. As the solar nebula collapsed, it formed a spinning disk of gas and dust, with most of the material concentrated at the center. Over time, the material in the disk began to clump together due to gravity, forming small rocky and icy planetesimals, which collided and merged to form larger bodies. These larger bodies eventually became the planets, moons, asteroids, and other objects that make up the solar system today. The exact composition of the solar nebula and the materials that formed the solar system varied depending on the distance from the Sun and the temperature and pressure conditions in different regions of the nebula. Generally, the inner solar system (including the Sun, Mercury, Venus, Earth, and Mars) is composed mostly of rocky materials, while the outer solar system (including the gas giants Jupiter, Saturn, Uranus, and Neptune, as well as the dwarf planet Pluto) is composed mostly of ices, such as water, ammonia, and methane, as well as gases like hydrogen and helium.

short term answer: dust and gas.

Explanation: learned it in 5th grade science class, bye have a great day !

Answer:

Therefore, the volume required at 600 atm and 0 °C is 0.319 L.

Explanation:

We can use the ideal gas law to solve for the number of moles of methane present, assuming ideal gas behavior at both conditions:

PV = nRT

At 300 atm and 200 °C:

n = PV/RT = (300 atm * 0.138 L) / [(0.08206 L atm mol^-1 K^-1) * (200 + 273.15) K * 1.067]

n = 2.451 mol

At 600 atm and 0 °C:

n = PV/RT = (600 atm * V2) / [(0.08206 L atm mol^-1 K^-1) * (273.15 K) * 1.367]

n = 7.682 V2

Since the number of moles of methane must be the same at both conditions:

2.451 mol = 7.682 V2

Solving for V2:

V2 = 0.319 L

Therefore, the volume required at 600 atm and 0 °C is 0.319 L.

Answer: 2136 molecules of CO2 at STP will occupy a volume of 8.91 × 10^-24 L

Explanation:

STP (standard temperature and pressure), 1 mole of any gas occupies 22.4 L of volume. Also, 1 mole of any gas contains 6.022 × 10^23 molecules.

1 mole of CO2 contains = 6.022 × 10^23 molecules

Therefore, 2136 molecules of CO2 will be present in a volume of:

= (1 mole CO2 / 6.022 × 10^23 molecules CO2) × (22.4 L / 1 mole CO2) × (2136 molecules CO2 / 1)

= 8.91 × 10^-24 L

Based on the information given, the mole should be considered a base unit in the SI system because it serves as a universally accepted measure of the amount or quantity of substances.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

SI units refer to units of measurement that are universally accepted for measuring the properties of quantities of objects.

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The cell potential for the reaction Mg(s)+Fe2+(aq)Mg2+(aq)+Fe(s) is 2.87 V at 89 degrees Celsius.

The Nernst equation can be used to compute this: Where E° cell is the standard cell potential, R is the gas constant, T is the temperature in Kelvin, n is the number of electrons transported, F is the Faraday constant, and Q is the reaction quotient, E cell is defined as E° cell - (RT/nF)lnQ.

E° cell = -2.37 V, R = 8.314 J/K-mol, T = 362 K, n = 2, F = 96485 C/mol, and Q = [Mg2+]/[Fe2+] = 0.110/2.80 = 0.039 in this instance. The Nernst equation using these values as input produces the result E cell = -2.37 - (8.314*362/2*96485)ln(0.039) = 2.87 V.

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The temperature inside the freezer is approximately -164°C.

To solve this problem, we can use the combined gas law equation:

[tex](P1V1)/T1 = (P2V2)/T2[/tex]

where P is the pressure, V is the volume, and T is the temperature of the gas.

We know that the initial volume of the balloon is 145 mL and the final volume is 35 mL. We also know that the initial temperature is 25°C or 298 K, and we need to find the final temperature.

Assuming the pressure of the gas remains constant, we can rearrange the combined gas law equation to solve for the final temperature:

[tex]T2 = (P2V2/T1)(P1/V1)[/tex]

Plugging in the values we know, we get:

[tex]T2 = (1 atm * 35 mL/298 K)(1 atm/145 mL) = 0.0808 atm/mL[/tex]

Multiplying both sides by 298 K and dividing by 0.0808 atm/mL, we get:

T2 = 109.15 K or approximately -164°C

Therefore, the temperature inside the freezer is approximately -164°C.

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The compound's empirical formula is [tex]S_2P[/tex]. We must ascertain the molar mass of the empirical formula in order to derive the molecular formula.

A substance created when two or more elements are chemically mixed in a specific ratio is referred to be a compound. In general, compounds differ from mixes, which are made up of various ingredients in a random arrangement. Compounds contain things like carbon dioxide ([tex]Co_2[/tex]), table salt ([tex]Nacl[/tex]), and water ([tex]H_2o[/tex]). Chemical reactions can transform compounds into less complex ones.

[tex]S_2P[/tex] has a molar mass of 120 g/mol. The empirical formula must be multiplied by two to obtain the molecular formula, which is [tex]S_4P_2[/tex], because the compound's molar mass is 252 g/mol.

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The temperature of copper would rise by 263.8°C more than the temperature of water if we added the same amount of heat to equal masses of each substance.

Specific heat capacity is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius or Kelvin. To estimate the final temperature difference, we can use the specific heat capacity of each substance.

The specific heat capacity of copper is 0.385 J/g°C, while the specific heat capacity of water is 4.184 J/g°C. This means that water requires over ten times as much heat energy as copper to raise its temperature by one degree Celsius.

If we add an equal quantity of heat (in joules) to equal masses of copper and water, we can expect the temperature of copper to rise much more than the temperature of water. In fact, we can calculate the temperature difference using the following formula:

Q = mCΔT

where Q is the amount of heat added, m is the mass of the substance, C is its specific heat capacity, and ΔT is the change in temperature.

If we assume that we add the same amount of heat to equal masses of copper and water (let's say 100 grams each), then we can set up two equations using the specific heat capacities of each substance:

Q = 100 * 0.385 * ΔT (for copper)

Q = 100 * 4.184 * ΔT (for water)

Since Q is the same in both equations (we added the same amount of heat to each substance), we can set the two equations equal to each other and solve for ΔT:

100 * 0.385 * ΔT = 100 * 4.184 * ΔT

0.385 * ΔT = 4.184 * ΔT

3.799 * ΔT = Q (where Q is the amount of heat added)

ΔT = Q / 3.799

So, if we added 1000 joules of heat to 100 grams each of copper and water, we can expect the temperature difference between the two substances to be:

ΔT = 1000 / 3.799 = 263.8°C

This means that the temperature of copper would rise by 263.8°C more than the temperature of water if we added the same amount of heat to equal masses of each substance. However, it's important to note that this is a theoretical estimate, and in reality, there would be some loss of heat to the surroundings, which would affect the final temperature difference.

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