What is the symbol for entropy? S ΔH H ΔS

Answer:

43 g N₂

Explanation:

To find the mass of N₂ required, you need to (1) convert grams H₂ to moles H₂ (via molar mass), then (2) convert moles H₂ to moles N₂ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles N₂ to grams N₂ (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 2 sig figs to match the amount of sig figs of the given value.

Molar Mass (H₂): 2(1.008 g/mol)

Molar Mass (H₂): 2.016 g/mol

Molar Mass (N₂): 2(14.009 g/mol)

Molar Mass (N₂): 28.018 g/mol

1 N₂(g) + 3 H₂(g) -----> 2 NH₃(g)

9.3 g H₂           1 mole             1 mole N₂             28.018 g
--------------  x  ----------------  x  --------------------  x  ------------------  =  43 g N₂
                        2.016 g            3 moles H₂            1 mole

The question requires us to calculate the amount of a 0.250 M sucrose solution necessary to prepare 400.0 mL of a 0.0310 M solution.

The question provided the following information:

molarity of more concentrated solution = C(A) = 0.250 M = 0.250 mol/L

molarity of less concentrated solution = C(B) = 0.0310 M = 0.0310 mol/L

volume of less concentrated solution = V(B) = 400.0 mL

The question refers to a simple dilution process, where we use a more concentrated solution (A) to preare a less concentrated solution (B). The amount of sucrose in both solutions doesn't change, thus we can say that the number of moles of sucrose in A is the same as it is in B:

From the definition of molar concentration (also called molarity), we can say that the number of moles of a solution corresponds to its concentration (in mol/L) multiplied by its volume (in L):

Considering the two equations above, we can write:

We can also rearrange this equation in order to calculate the volume of more concentrated solution, V(A), necessary:

Now, we can use the values given by the question in the equation to calculate V(A):

Therefore, 49.6 mL of a 0.250 M sucrose solution are necessary to prepare 400.0 mL of a 0.0310 M solution. Note that, as 400.0 mL is the total volume of the solution B, this solution should be prepared with 49.6 mL of solution A + 350.4 mL of water.

The "air" that puffs up a potato chip bag is primarily composed of nitrogen gas (N₂).

Nitrogen gas is used for packaging due to its non-reactive nature. When the bags are filled with nitrogen gas, it displaces the oxygen inside, creating a controlled atmosphere. This is done to prevent the chips from getting stale. Oxygen can lead to oxidative reactions, causing the chips to go rancid or lose their crispiness. Nitrogen, being an inert gas, doesn't react with the chips or affect their taste or texture.

It acts as a protective barrier, shielding the chips from moisture and oxygen, thereby maintaining their freshness and extending their shelf life. The use of nitrogen gas ensures that the chips remain crispy and flavorful when you open the bag.

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Answer: a,

endothermic with the release of energy

Answer:

I think B sorry if wrong

Explanation:

have a good day

Answer:

The acid mist is known as laze - a term combining the words lava and haze - when laze and sea water combine. Laze is potentially deadly if inhaled and can be hot and corrosive. If anyone goes near it, they can experience breathing difficulties and irritation of their eyes and skin.

Explanation:

hope it helps :)

The statement that correctly describes the reaction of sulfur dioxide gas in the presence of oxygen and vanadium(V) oxide to form sulfur trioxide is: Vanadium (V) oxide is a catalyst.

The correct option is 4.

A catalyst is a substance that alters the rate of a chemical reaction but which remains chemically unchanged at the end of the chemical reaction.

A catalyst can increase the rate of chemical reactions and it can also decrease the rate of chemical reactions. Catalysts that increase the rate of chemical reactions are called positive catalysts whole catalysts that decrease the rate of chemical reactions are called negative catalysts.

Catalysts alter the rate of chemical reactions by lowering or raising the activation energy of a reaction.

The reaction of sulfur dioxide gas in the presence of oxygen and vanadium(V) oxide to form sulfur trioxide is a catalytic reaction.

In the reaction, vanadium(V) oxide acts as a positive catalyst by speeding up the rate of the reaction.

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Complete question:

Sulfur dioxide gas can react in the presence of oxygen and vanadium(V) oxide to form sulfur trioxide. Sulfur trioxide is the only product of the reaction. Which statement correctly describes this reaction?

1) Sulfur dioxide is a catalyst

2) Sulfur trioxide is a catalyst

3) Oxygen is a catalyst

4) Vanadium (V) oxide is a catalyst

An Arrhenius base is a molecule that when dissolved in water will break down to yield an \(OH^-\)or hydroxide ion in solution.

An Arrhenius base is a compound that increases the \(OH^-\) ion concentration in aqueous solution.

An Arrhenius base is a substance that, when dissolved in an aqueous solution, increases the concentration of hydroxide, or , \(OH^-\) ions in the solution.

Bases Properties

Arrhenius bases that are soluble in water can conduct electricity.

Bases often have a bitter taste and are found in foods less frequently than acids. Many bases, like soaps, are slippery to the touch.

Bases also change the colour of indicators. Red litmus turns blue in the presence of a base (see figure below), while phenolphthalein turns pink.

Some bases react with metals to produce hydrogen gas.

Acids (pH < 7.0) react with bases (pH > 7.0) to produce a salt and water. When equal moles of an acid and a base are combined, the acid is neutralized by the base. The resulting mixture will have a more neutral pH.

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of \(H^+\) ions in the water. In contrast, an Arrhenius base dissociates in water to form hydroxide ions \(OH^-\).

Example, sodium hydroxide, is added to an aqueous solution. NaOH dissociates into sodium, \(Na^+\), and hydroxide, \(OH^-\) ions.

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Answer:

brittle

Explanation:

Answer:

brittle

Explanation:

Dew forms on the grass in the early morning due to the process of condensation.

During the day, the sun heats up the ground and the air around it. When the sun sets, the ground and the air begin to cool down. As the air cools, its ability to hold moisture decreases. When the temperature drops below the dew point, which is the temperature at which the air is saturated and cannot hold any more moisture, the excess moisture in the air condenses into liquid water droplets. These droplets then collect on cool surfaces, such as grass, forming dew.

The grass is a good surface for dew to form on because it is usually cooler than the surrounding air due to transpiration, the process by which water evaporates from the leaves and stems of plants. This causes the grass to cool down faster than the air around it, making it more likely for dew to form on its surface.

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Answer:

C2H3Br + O2 → CO2 + H2O + HBr

Explanation:

So it should be D :)

Answer:

the person above is correct.

Explanation:

Answer:

1) Pure water can conduct electricity because a small proportion of its molecules dissociate into ions . The two ions formed in water are, hydrogen ions, H +, and hydroxide ions, OH -.

2) dynamic equilibrium

Explanation:

I hope this helps!

The term "ionizes" refers to the process by which an acid dissociates into its ions in solution. An acid that ionizes only slightly in solution is considered a weak acid.

A 0.12 m (molar) solution of a weak acid that ionizes only slightly would be considered dilute because it contains a relatively low concentration of acid molecules.
A 0.12 M solution of an acid that ionizes only slightly in solution would be termed a "weak acid."

Weak acids do not fully ionize in solution, meaning they only partially dissociate into their constituent ions. This results in a lower concentration of H+ ions and a higher pH value compared to strong acids.

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A mole is defined as the amount of substance in grams that has a number of particles equal to the number of atoms in 12 g of carbon-12. One mole of any substance has a mass equal to its molecular or atomic weight. Molarity is expressed as moles of solute per liter of solution.

Therefore, we can use the following formula to calculate the number of moles of solute contained in a specific volume of a solution: moles of solute = molarity x volume of solution, To calculate the number of moles of sodium hydroxide (NaOH) in 2.00 L of a 2.6 M NaOH solution.

We will use the above formula: moles of NaOH = molarity x volume of solution = 2.6 M x 2.00 L = 5.2 moles of NaOH. So, there will be 5.2 moles of NaOH contained in 2.00 L of a 2.6 M NaOH solution.

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The correct formula for a compound formed from the elements Al and O is Al₂O₃.

Correct option is C.

Aluminum oxide is an oxide of aluminum with the chemical formula Al₂O₃ which is primarily composed of two chemically bonded aluminum and oxygen atoms. Aluminum oxide chemical compounds exist in various forms, with the most common being alpha, gamma, and theta.

The solid compound is an odorless, white powder which is insoluble in water and is a major component of the Earth's crust. It occurs naturally as corundum, bauxite, and cryolite and can be synthetically produced through burning aluminum metal or dissolving alumina tri-hydrate.

Aluminum oxide is widely used in a variety of applications due to its unique properties such as hardness, thermal conductivity, electrical conductivity, optical properties, and chemical inertness.

Correct option is C.

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The rate of solvation can be increased by changing the size of the solute particles, increasing the temperature of the solvent, and increasing the surface area of the solute. This will increase the number of particles exposed to the solvent and the frequency of collisions.

The rate of solvation can be increased by changing the size of the solute particles, increasing the temperature of the solvent, and increasing the surface area of the solute. When a solute is dissolved in a solvent, the solute particles are exposed to the solvent particles. The rate at which a solute dissolves in liquids is affected by the collision of particles. Solute particles must collide with the solvent particles in order to dissolve.

The greater the number of collisions, the faster the rate of solvation. Smaller solute particles will have a larger surface area and will be more easily dissolved in the solvent. A higher temperature will cause the solvent particles to move more rapidly, which will increase the frequency of collisions. The rate of solvation can be designed to occur at an increased rate by increasing the surface area of the solute.

This can be done by grinding the solute into a powder, which will increase the number of particles and increase the surface area. By increasing the surface area, more particles will be exposed to the solvent, which will increase the frequency of collisions.

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Answer:

The volume of the gas is approximately 4.41 liters

Explanation:

The details of the data of the Neon gas are;

The number of moles of Neon gas present, n = 11.6 moles

The temperature of the sample of Neon gas, T = 120 K

The pressure of the sample of the Neon gas, P = 25.6 atm

By the ideal gas equation, we have;

P·V = n·R·T

Where;

R = The universal gal constant = 0.08205 L·atm·mol⁻¹·K⁻¹

Therefore, we get;

V = n·R·T/P

Which gives;

V = 11.6 moles × 0.08205 L·atm·mol⁻¹·K⁻¹ × 120 K/(25.9 atm) ≈ 4.4097915 L

The volume of the gas, V ≈ 4.41 L.

The answers to the given questions are: (a) The work done by the gas is -1831 J, (b) The energy transferred as heat Q is 2472 J, (c) The change in internal energy of the gas is 928 J, (d) The change in the average kinetic energy per atom is 3.11 × 10^-22 J/atom.

Given data: Number of moles of gas n = 4.10 mol

Change in temperature ∆T = 15 K

For an ideal monatomic gas, we know that the internal energy U depends only on the temperature T.

The internal energy of an ideal monatomic gas is given by the following formula: U = 3/2 nRT

where R is the gas constant. Work done by the gas in an adiabatic process is given by the following formula: W = -∆U = -3/2 nR∆T

Now, we can substitute the given values to find the work done by the gas, W = -3/2 × 4.10 × 8.31 × 15.0= -1831 J

The first law of thermodynamics states that ∆U = Q + W

The energy transferred as heat Q is: Q = ∆U - W= 3/2 nR∆T - (-1831) = 3/2 × 4.10 × 8.31 × 15.0 + 1831= 2472 J

The change in internal energy of the gas is given by: ∆U = 3/2 nR∆T= 3/2 × 4.10 × 8.31 × 15.0= 928 J

The average kinetic energy per atom is given by the following formula: K = 3/2 kT

Where k is Boltzmann's constant. Kinetic energy of one mole of an ideal gas can be written as follows: K = 3/2 RT

Where R is the gas constant. So, the change in the average kinetic energy per atom is:∆K = 3/2 k ∆T= 3/2 × 1.38 × 10^-23 × 15.0= 3.11 × 10^-22 J/atom

Therefore, the answers to the given questions are: (a) The work done by the gas is -1831 J.

(b) The energy transferred as heat Q is 2472 J.

(c) The change in internal energy of the gas is 928 J.

(d) The change in the average kinetic energy per atom is 3.11 × 10^-22 J/atom.

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Answer:

It is a single replacement (SR) reaction also known as displacement reaction

Explanation:

Here, we want to write the equation of reaction for the single replacement of magnesium and cadmium (II) nitrate

Magnesium ion is higher up than cadmium (ii) ion in the electrochemical series. What this means is that it can displace it from its salt

We have the equation of reaction in words as:

Using their symbols, we have the equation above as:

Answer:

all of them

Explanation:

these all are true

Answer:

They all are correct.

Explanation:

The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.

Y is the septum

The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.

Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.

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Answer:

Explanation:El mol es una unidad conveniente de usar debido a la gran cantidad de átomos, moléculas u otros en cualquier sustancia.

The following compounds have integer i values:KClNa2CO3

The following compounds have integer i values: KCl and Na2CO3.

i stands for van't Hoff factor and is the number of particles formed from one solute molecule in a solution.

An i value of 1 means that no particles are produced upon solvation or that the solute molecule exists independently in the solvent.

Conversely, an i value greater than one indicates that one molecule of solute produces more than one particle in the solvent. This includes molecules that dissociate into ions, form complexes, or exist in a solvent as aggregates.

It is worth noting that the i value is an experimentally derived value and may not necessarily be an integer.

According to the question, the following compounds have integer i values:KClNa2CO3

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Answer:

1.T

2.I

Explanation:

hope it help

#carry on learning

The object and description that matches is Object 2 and T.

Object 1 has no matching description.

A Fish aquarium filter is a filter whose function is to clean the water of debris, removes the toxic buildup of ammonia and nitrates, and aerates the water so that fish can in a conducive environment and breathe properly

An engine oil filter is a filter whose function is to filter and remove contaminants that may be present in the engine oil, transmission oil, lubricating oil, or hydraulic oil in order for proper functioning of the engine.

Therefore, the object and description that matches is Object 2 and T.

Object 1 has no matching description.

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The complete sentences are:

Page 3:

The effect of energy in phase transitions of matter is that it is required to break the intermolecular forces that hold the particles of a substance together. When energy is added to a substance, the particles move faster and the intermolecular forces are broken. This can cause the substance to change phase.

The interactive demonstration on the sample of water shows that energy is required to melt ice and boil water. When the ice is heated, the particles start to move faster and the ice melts. The temperature of the water stays constant at 0°C until all of the ice has melted. This is because the energy is being used to break the intermolecular forces in the ice. Once all of the ice has melted, the temperature of the water starts to rise again. When the water is boiled, the particles move so fast that they escape from the liquid state and become a gas. The temperature of the water stays constant at 100°C until all of the water has boiled. This is because the energy is being used to break the intermolecular forces in the water. Once all of the water has boiled, the temperature of the steam starts to rise again.

The complete sentences:

Page 4:

Heating curves show the temperature of a substance as it is heated. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Cooling curves show the temperature of a substance as it is cooled. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Both curves show that the temperature of a substance increases as it is heated and decreases as it is cooled.

A heating curve is more choppy than a cooling curve because there are more phase changes during heating than during cooling.

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Answer:

Sink

Explanation:

For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that \(25/7 > 1\), so the substance would sink.