A 3.43 mol sample of helium is in a 27.17 L container. What is the
pressure of this gas in atmospheres at 219 °C?
A) 2.21 atm
B) 5.10 atm
C) 6.50 atm
D) 7.92 atm

A chemical process known as an oxidation-reduction (redox) reaction occurs when electrons are exchanged between two or more species.

Thus, This happens between two distinct elements in the majority of redox reactions. The element that loses electrons is said to be the reducing agent and is oxidized.

The oxidizing agent is the element that obtains electrons and is reduced. These oxidation/reduction reactions in acidic or basic solution can be expressed as balanced half-reactions. The total balanced redox reaction equation is created by adding these balanced half-reactions.

This is an equation for a redox reaction. We must recognize changes in oxidation states that take place between elements in order to balance the equation.

Thus, A chemical process known as an oxidation-reduction (redox) reaction occurs when electrons are exchanged between two or more species.

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Answer: 4

Explanation: because the zero doesn't count

The skier is able to coast between points s and t even though it is uphill because of gravity. The correct answer is A.

Gravity is the force that pulls objects towards each other. In the case of a skier coasting uphill between points s and t, gravity is still acting on the skier, pulling them towards the Earth. This gravitational force is what allows the skier to maintain their speed and momentum, even as they move uphill.

While centripetal force, cohesive force, and inertia are all important concepts in physics, they are not directly relevant to the scenario described in the question.

Centripetal force refers to the force that keeps an object moving in a circular path, cohesive force refers to the force that holds molecules together in a substance, and inertia refers to an object's tendency to resist changes in motion.

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The force that helps keep the Earth in its orbit around the Sun is the gravitational force.

The Sun has a massive gravitational pull due to its large mass, which causes the Earth to be attracted towards it. This force of attraction is what keeps the Earth in its stable orbit around the Sun.

The gravitational force between the Sun and the Earth is balanced by the Earth's velocity and centrifugal force, which allows it to maintain a stable orbit around the Sun.

The gravitational force is the attractive force that exists between any two objects with mass. The magnitude of the gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

This means that the larger the mass of the objects and the closer they are to each other, the stronger the gravitational force between them.

In the case of the Earth and the Sun, the Sun is much more massive than the Earth, which means it exerts a much stronger gravitational force on the Earth. The Earth is constantly falling towards the Sun due to the force of gravity.

However, the Earth also has a tangential velocity that keeps it moving in a circular orbit around the Sun. This is known as centrifugal force, which is the force that acts on an object moving in a circular path, pulling it away from the center of the circle.

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The experimenters could isolate the effect of the color of the cans on the temperature of the water inside, assuming all other variables were held constant.

A scientific or empirical approach of testing a hypothesis or looking into a particular phenomena or relationship between variables is to conduct an experiment. In order to monitor changes in one or more dependent variables, it entails changing one or more independent variables while holding all other variables constant.

The variables that were controlled in the experiment were:

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Answer:

[OH⁻] = 8.33 * 10⁻¹²

Explanation:

We know that [OH⁻] * [H⁺] = 10⁻¹⁴

plugging the value of [H⁺]

[OH⁻] * 1.2 * 10⁻³ = 10⁻¹⁴

[OH⁻] = 10⁻¹⁴ * (10³/1.2)

[OH⁻] = 833.3 * 10⁻¹⁴

[OH⁻] = 8.33 * 10⁻¹²

Explanation:

We determine the mass of the helium gas,

mHe, that is required to produce the given sample. We do this by first considering that neon gas behaves ideally with the given conditions, such that we use the equation

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. Moreover, we express the number of moles as:

n= mMW

where 'MW is the molar mass. We use the following values for the variables:

P =255atm

V =100.0 L

R = 0.08206Latm/molK

T = 25 + 273= 298 K

MW = 4.003 g/mol

We proceed with the solution.

We would need a total of 4.17×103 grams of helium gas.Now, we determine the mass when we are going to consider oxygen gas. We would be applying the same working equation but we use a different value for MW, wherein we have

MW=16.00g/mol

We proceed with the solution and plug in the variables

We would need a total of 1.67×10^4 grams of oxygen gas.

(Hopefully this helps u out!)

The gas behaves ideally, we can use the ideal gas law to determine the volume of the gas PV = nRT. The volume of the gas is 12.8 L at a temperature of 175 K and a pressure of 177.3 kPa.

Assuming the gas behaves ideally, we can use the ideal gas law to determine the volume of the gas:

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.

We can rearrange the ideal gas law to solve for V:

V = nRT/P

Substituting the given values, we get:

V = (2.75 moles)(8.31 J/mol-K)(175 K)/(177.3 kPa)

Note that we need to convert the pressure from atm to kPa, since the gas constant R is in units of J/mol-K.

Simplifying the expression, we get:

V = 12.8 L

Therefore, the volume of the gas is 12.8 L at a temperature of 175 K and a pressure of 177.3 kPa.

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The percent yield of the reaction 2NO(g)+O₂(g)→2NO₂(g) is 7.98%.

Mole ratio of NO to NO₂ is 2:2 or 1:1. Therefore, the number of moles of NO₂ formed is equal to the number of moles of NO reacted.

For an ideal gas, PV = nRT

                              n = PV/RT where temperature is in kelvin

volume of NO₂ formed = 98.3 L

temperature = 39.0°C or 312.15 K

pressure = 631 mmHg or 0.830 atm

n(NO) = PV/RT \

= (0.830 atm)(98.3 L)/(0.0821 L·atm/mol·K)(312.15 K)

= 33.6 mol

Since, the ratio is 1:1  yield of NO₂ is also 33.6 mol.

Actual yield can be found by converting moles in molar mass of NO₂

NO₂: 1 × 14.01 + 2 × 16.00 = 46.01 g/mol

If  the mass of NO2 obtained was 123.4 g. Then the number of moles of NO₂ is

n(NO₂) = m/M = 123.4 g/46.01 g/mol = 2.68 mol

% yield = (actual yield/theoretical yield) x 100%

= (2.68 mol/33.6 mol) x 100%

= 7.98%

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Answer: Pressure of the gas is 19.65 atm.

Explanation: Known quantities=

No of moles=37

Temperature=167 °C=440K

Volume=68 liters

unknown quantities

Pressure=x atm

The unknown quantity pressure can be found out by using the ideal gas law equation given by:

PV=nRT ---------- (1)

P = pressure.

V =volume.

n =amount of substance.

R= ideal gas constant.

Substituting the values in equation (1)

P=(37x0.0821x440)/(68)

=19.65 atm

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Answer: D

Explanation:

Thermal energy is akin to kinetic energy, which is movement of particles in a substance.

Answer:  3.142 M

Explanation:

use the dilution formula

M1V1=M2V2

M2= 5.9 X 4.1 / 7.7  = 3.142 M  if need to correct sig figs its 3.1 M

The AH for the reaction 2NC1(g) +[tex]3H_{2}[/tex](g) → [tex]N_{2}[/tex](g) + 6HCl(g) using bond energies is -1,074 kJ/mol, indicating an exothermic reaction.

To predict the enthalpy change (AH) of the reaction using bond energies, we need to calculate the energy required to break the bonds in the reactants and the energy released when the products' new bonds are established.

The AH of the reaction is the difference between the energy required to break the bonds in the reactants and the energy released when new bonds are formed in the products.

The following is the chemically balanced equation for the reaction:

2NC1(g) + [tex]3H_{2}[/tex](g) → [tex]N_{2}[/tex](g) + 6HCl(g)

The bond energies that we need are:

Bond energies to break:

N≡C1: 305 kJ/mol

H-H: 436 kJ/mol

Bond energies to form:

N≡N: 946 kJ/mol

H-Cl: 431 kJ/mol

Now we can calculate the energy required to break the bonds in the reactants:

2(N≡C1)(305 kJ/mol) + 3(H-H)(436 kJ/mol) = 2(610 kJ/mol) + 3(436 kJ/mol) = 2,218 kJ

We can also calculate the energy released when new bonds are formed in the products:

1(N≡N)(946 kJ/mol) + 6(H-Cl)(431 kJ/mol) = 1(946 kJ/mol) + 6(431 kJ/mol) = 3,292 kJ

Therefore, the AH of the reaction is:

AH = energy released when new bonds are formed minus energy needed to break existing bonds.

= -1,074 kJ/mol

The exothermic nature of the reaction, or the release of energy, is indicated by the negative sign. Therefore, the AH of the reaction is -1,074 kJ/mol.

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Answer: Shown below

Explanation:

CaCl2=calcium chloride

Mg(NO3)2=Magnesium nitrate

ZaCl2=Zinc Chloride

NH2Cl=Chloramine

AgNO2=Silver nitrate

NaCl= Sodium chloride

KI=Potassium iodide

PbSO4=Lead(II) Sulfate

n82CO3=Sodium carbonate

KNO3=Potassium nitrate

N82SO4=Sodium Sulfate.

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The name of the compounds and the involved ion are as follows;

Ionic compound is any of a large group of chemical compounds consisting of oppositely charged ions, wherein electron transfer, or ionic bonding, holds the atoms together.

Ionic compounds, when in an aqueous solution, dissociates into its respective ions. This question gives the chemical formula of certain compounds. For example, the sodium ions attract chloride ions and the chloride ion attracts sodium ions. The result is a three-dimensional structure of alternate Na⁺ and Cl⁻ ions.

The names of the chemical compound and the ionic elements that make them up are given in the main answer part.

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Answer: hope this helps

Explanation: Reduces the amount of dissolved oxygen in the water, making it challenging for aquatic life to breathe. Fish require more oxygen because their metabolic rate increases in warm water. Additionally, it may alter the timing of aquatic organisms' life cycles and breeding patterns, as well as the rates at which some species grow. The food chain may be disrupted, and the health of the ecosystem as a whole may suffer. In order to reduce their negative effects on aquatic life, power plants that release warm water into rivers need to be carefully regulated.

Answer:

The mass of all atoms is compared to the carbon atom

The solution contains 66 g of sodium acetate, which is less than the maximum amount that can remain in the solution, no recrystallization occurs when a seed crystal is added.

Calculate the amount of sodium acetate that dissolves in 100 g of water at 25°C:

46 g NaC₂H₃O₂ / 100 g H₂O = x / 100 g H₂O

x = 46 g

Therefore, at 25°C, the solution is already supersaturated and contains 112 g - 46 g = 66 g of undissolved sodium acetate.

When the solution is heated to 100°C, all the sodium acetate dissolves, since the solubility at this temperature is 170 g per 100 g H₂O. The total mass of the solution is now 100 g + 112 g = 212 g.

When the solution is cooled back to 20°C, the solubility of sodium acetate decreases to 46 g per 100 g H₂O. The maximum amount of sodium acetate that can remain in solution at this temperature is:

46 g NaC₂H₃O₂ / 100 g H₂O x 212 g H₂O = 97.52 g NaC₂H₃O₂

All the sodium acetate remains dissolved in the solution.

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The specific heat of the solid is 4.2 J/g/°C and the specific heat of the liquid is 36.3 J/g/°C.

In this case, we know that the mass of the solid is 9.80 g, the change in temperature is 235 °C, and the heat added is 10,000 J. We can solve for the specific heat of the solid as follows:

c = Q / m ΔT

= 10,000 J / 9.80 g / 235 °C

= 4.2 J/g/°C

The latent heat of fusion for the unknown material is 334 J/g. We can now calculate the heat required to melt the solid as follows:

Q = mLf

= 9.80 g * 334 J/g

= 32,832 J

The total heat added to the liquid is 10,000 J + 32,832 J = 42,832 J. The change in temperature of the liquid is 235 °C - 20 °C = 115 °C. We can now calculate the specific heat of the liquid as follows:

c = Q / m ΔT

= 42,832 J / 9.80 g / 115 °C

= 36.3 J/g/°C

Therefore, the specific heat of the solid is 4.2 J/g/°C and the specific heat of the liquid is 36.3 J/g/°C.

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An experiment is performed on an unknown material and produces the given heat curve. The temperature of the material is shown as a function of heat added. Other experiments determine that the material has a temperature of fusion of fusion=235 °C and a temperature of vaporization of vapor=471 °C.

If the sample of material has a mass of =9.80 g, calculate the specific heat when this material is a solid, s, and when it is liquid, l.

Answer:

Electrolysis of water

Explanation:

decomposition of water into oxygen and hydrogen due to an electric current being passed through the water.

1. 10.0 mol of Cr weighs 520.0 grams.

2. 2.40 mol of N2 weighs 67.25 grams.

3. 4.52 x 10^-5 mol of C2H4 weighs 0.00127 grams.

To convert quantities given in moles into grams, we need to use the molar mass of the substance. The molar mass is the mass of one mole of the substance, and it is expressed in grams per mole (g/mol).

1.) To convert 10.0 mol Cr into grams, we need to know the molar mass of Cr. The molar mass of Cr is 52.00 g/mol. Therefore:

10.0 mol Cr x 52.00 g/mol Cr = 520.0 g Cr

So 10.0 mol of Cr weighs 520.0 grams.

2.) To convert 2.40 mol N2 into grams, we need to know the molar mass of N2. The molar mass of N2 is 28.02 g/mol. Therefore:

2.40 mol N2 x 28.02 g/mol N2 = 67.25 g N2

So 2.40 mol of N2 weighs 67.25 grams.

3.) To convert 4.52 x 10^-5 mol C2H4 into grams, we need to know the molar mass of C2H4. The molar mass of C2H4 is 28.05 g/mol. Therefore:

4.52 x 10^-5 mol C2H4 x 28.05 g/mol C2H4 = 0.00127 g C2H4

So 4.52 x 10^-5 mol of C2H4 weighs 0.00127 grams.

In conclusion, to convert moles into grams, we need to use the molar mass of the substance. We multiply the number of moles by the molar mass to obtain the mass in grams. It is essential to use the correct units and pay attention to significant figures to get accurate results.

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The transition that involves the greatest change in energy is the transition shown by (f)

When an electron moves from one energy level to another, this is referred to as an energy transition in an atom. An atom's electrons can be found in various orbitals or energy levels, and because these levels are quantized, only specific values are permitted.

The transition in f involves a movement from n = 1 to n =4 that shows a great involvement of energy for such to occur.

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Temp. is lowered from 15 to 10 degrees C: Pressure decreased

Temp. rises from 20 to 30 degrees C: Pressure increased

More molecules of gas are introduced into the container: Pressure increased

The volume of the container holding gas is increased: Pressure decreased

The pressure of a gas is affected by several factors, such as temperature, the number of gas molecules present, and the volume of the container.

When the temperature of a gas is lowered, the kinetic energy of the gas molecules decreases. As a result, the molecules move slower and exert less force on the walls of the container, causing the pressure to decrease.

Conversely, when the temperature is raised, the kinetic energy of the gas molecules increases, leading to more collisions with the walls of the container and an increase in pressure.

When more gas molecules are added to a container, there are more collisions between the gas molecules and the walls of the container. This increase in collisions leads to an increase in pressure. On the other hand, if the number of gas molecules is decreased, there are fewer collisions with the walls of the container, resulting in a decrease in pressure.

Finally, the pressure of a gas is inversely proportional to the volume of the container holding the gas. When the volume of the container is increased, the gas molecules have more space to move around, and fewer collisions occur with the walls of the container.

As a result, the pressure decreases. Conversely, when the volume of the container is decreased, the gas molecules have less space to move, leading to more collisions with the walls of the container and an increase in pressure.

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PROPER QUESTION

Read each description of the various conditions that are likely to affect the pressure of a gas. Drag each description into the correct box.

Temp. is lowered from 15 to 10 degrees C

Temp. rises from 20 to 30 degrees C

More molecules of gas are introduced into the container

The volume of the container holding gas is increased

Box:

Pressure increased

Pressure decreased

The physical examination of an organic compound are appearance and physical state, melting point and boiling point, solubility, density, and spectroscopic analysis

Appearance and physical state: observe the appearance of the compound and note its physical state.

Melting point and boiling point: measure the melting point and boiling point of the compound to determine its purity and identity.

Solubility: Test the solubility of the compound in different solvents such as water, ethanol, acetone, etc.

Density: determine the density of the compound to calculate its molecular weight and to assess its purity.

Spectroscopic analysis: use spectroscopic techniques such as nuclear magnetic resonance (NMR), and mass spectrometry (MS) to determine the functional groups, molecular structure, and identity of the compound.

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Answer:

false

Explanation:

Denitrifying bacteria and nitrogen-fixing bacteria perform opposite processes in the nitrogen cycle. Nitrogen-fixing bacteria convert atmospheric nitrogen into usable forms such as ammonia, while denitrifying bacteria convert nitrates in the soil back into atmospheric nitrogen

Answer:

a composition of elements

Because magnesium is in group two of the periodic table, a magnesium ion will most likely have a two-plus charge.

When placed in an electromagnetic field, the physical feature of matter known as electric charge causes matter to experience a force. A positive or negative electric charge can exist. Like charges repel one another, whereas unlike charges attract one another.

A neutral object is one that does not have any net charge.

When matter is placed in an electromagnetic field, it experiences a force due to its electric charge.

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Answer:2

Explanation:

To get the formula of an ionic compound from its name, we need to identify the ions present and balance their charges to determine the subscript of each ion.

Ionic compounds are composed of positively charged ions (cations) and negatively charged ions (anions). The name of an ionic compound provides information about the ions present in the compound.

In the case of calcium chloride, the name tells us that the compound contains a calcium ion (Ca²⁺) and a chloride ion (Cl⁻). To write the formula of the compound, we need to balance the charges of the ions. Since the calcium ion has a charge of +2 and the chloride ion has a charge of -1, we need two chloride ions to balance the charge of one calcium ion. Therefore, the formula of calcium chloride is CaCl₂.

To determine the formula of other ionic compounds from their names, we need to follow the same process of identifying the ions present and balancing their charges. For example, in sodium sulfide (Na₂S), the name tells us that the compound contains a sodium ion (Na⁺) and a sulfide ion (S²⁻). To balance the charges, we need two sodium ions for every one sulfide ion, so the formula of sodium sulfide is Na₂S.

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Both models represent nuclear reactions that produce energy, but Model 1 is most likely to occur in the sun, while Model 2 is most likely to occur in nuclear power plants.

option B is correct.

Based on the given models, the statement that is most likely correct is: Both models show reactions which produce energy in the sun.

Model 1 represents a type of nuclear reaction called fusion, which is the process of combining two atomic nuclei to form a heavier nucleus. Fusion reactions occur naturally in stars like the sun, where the high temperatures and pressures allow atomic nuclei to overcome their natural repulsion and fuse together. The energy released by fusion reactions in the sun is what makes it shine and provides the energy for life on Earth.

Model 2 represents a type of nuclear reaction called fission, which is the process of splitting a heavy atomic nucleus into two or more lighter nuclei. Fission reactions are typically used in nuclear power plants to generate energy, where the heat produced by the fission reactions is used to produce steam and generate electricity. both models represent nuclear reactions that produce energy, but Model 1 is most likely to occur in the sun, while Model 2 is most likely to occur in nuclear power plants.

so, the correct option B

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