What choice
demonstrates the Law of
Conservation of Mass?

The actual value of the van't Hoff factor, i, is 2, as KNO₃ dissociates into two ions (K+ and NO₃-) in solution.

To calculate the grams of KNO₃ needed to produce a solution that freezes at -14.5 °C, we can use the formula:

ΔT = Kf * m * i

where ΔT is the change in freezing point, Kf is the molal freezing point depression constant, m is the molality of the solution, and i is the van't Hoff factor.

First, let's calculate the molality (m) of the solution:

m = moles of solute / mass of solvent (in kg)

Since we have 275 mL of water, which is equivalent to 0.275 L, and assuming water has a density of 1 g/mL, the mass of the solvent is 0.275 kg.

To determine the moles of solute, we need to use the equation:

ΔT = Kf * m * i

Substituting the given values:

-14.5 °C = (1.86 °C/m) * m * i

Solving for m * i:

m * i = -14.5 °C / (1.86 °C/m)

m * i = -7.80 m

Since KNO₃ dissociates into K+ and NO₃- ions, the van't Hoff factor (i) is 2.

Now we can solve for the molality of the solution (m):

m * i = -7.80 m

2m = -7.80 m

m = -7.80 m / 2

m = -3.90 m

Finally, we can calculate the moles of KNO₃:

moles of solute = m * mass of solvent (in kg)

moles of KNO₃ = (-3.90 m) * 0.275 kg

To convert moles to grams, we multiply by the molar mass of KNO₃, which is approximately 101.1 g/mol.

grams of KNO₃ = moles of KNO₃ * molar mass of KNO₃

Therefore, the number of grams of KNO₃ required to produce the solution is:

grams of KNO₃ = (-3.90 m) * 0.275 kg * 101.1 g/mol

The actual value of the van't Hoff factor, i, is 2, as KNO₃ dissociates into two ions (K+ and NO₃-) in solution.

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the ΔG° value is expected to be closest to ΔH° for reactions with low entropy changes, such as the dissolution of NaCl(s) NaCl(s) → Na+(aq) + Cl-(aq)

The relationship between the change in Gibbs free energy (ΔG°) and the change in enthalpy (ΔH°) is described by the equation ΔG° = ΔH° - TΔS°, where T is the temperature and ΔS° is the change in entropy.

In order for ΔG° to be closest to ΔH°, the value of ΔS° must be small. This is because as the temperature increases, the contribution of the entropy term to ΔG° becomes more significant, and the value of ΔG° deviates further from ΔH°. Therefore, for reactions with low entropy changes, ΔG° will be closest to ΔH°.

Looking at the given reactions, the one with the lowest entropy change is the formation of Na+(aq) and Cl-(aq) from NaCl(s). This reaction involves the dissolution of a crystalline solid into its constituent ions in solution, which is a highly ordered process and thus has a low entropy change. Therefore, for this reaction, ΔG° is expected to be closest to ΔH°.

In contrast, the reaction involving the synthesis of NH₃(g) from N₂(g) and H₂(g) has a large increase in entropy due to the formation of a gas from two reactants. Therefore, ΔG° for this reaction will deviate significantly from ΔH° at higher temperatures.

In summary, the ΔG° value is expected to be closest to ΔH° for reactions with low entropy changes, such as the dissolution of NaCl(s).

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The amount of  Na₂SO₄ would be 15.09 grams

From the equation of the reaction:

4NaOH + 2H₂SO₄ --> 2Na₂SO₄ + 4H₂O

Mole ratio of NaOH and Na₂SO₄ = 2:1

Mole of 8.50 grams of NaOH = 8.50/40

                                                 = 0.21 mole

Equivalent mole of Na₂SO₄ = 0.21/2

                                              = 0.11 mole

Mass of 0.11 mole Na₂SO₄ = 0.11 x 142.04

                                             = 15.09 grams

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Answer:

∴ Q = -7.52kCal

Explanation:

Using the formula for specific heat capacity:

Q = mcΔT

where ΔT = change in temperature (final - initial)  = (0 - 100)°C = -100°C

m = mass (g) = 75g

c = specific heat capacity = 4.2 J/g°C in water

⇒ Q = 75 × 4.2 × -100

= -31,500J

But 1J - 0.000239kCal

∴ Q = -7.52kCal

Let me know if I can be of further assistance.

Answer:

cholera and salmonella

Explanation:

i believe so

The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

Answer:

i think the answer is c because it says that is all they care

The combination of aqueous solutions that should produce a precipitate is the correct option b) MgCl2 and (NH4)2CO3.

This combination of aqueous solutions should produce a precipitate because when magnesium chloride (MgCl2) reacts with ammonium carbonate ((NH4)2CO3), it forms magnesium carbonate (MgCO3), which is an insoluble precipitate, along with ammonium chloride (NH4Cl), which remains dissolved in the solution.

This mixture of aqueous solutions ought to result in a precipitate because ammonium carbonate (NH4)2CO3 and magnesium chloride (MgCl2) react to form magnesium carbonate (MgCO3), an insoluble precipitate, and ammonium chloride (NH4Cl), which stays dissolved in the solution. Because of this, option (b) MgCl2 and (NH4)2CO3 is the combination of aqueous solutions that should precipitate.

Hence, The combination of aqueous solutions that should produce a precipitate is the correct option b) MgCl2 and (NH4)2CO3.

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Multiple personality or dissociative identity disorder often begins in childhood as a result of unbearable experiences.

The correct option is b) in childhood as a result of unbearable experiences.

Dissociative identity disorder (DID), previously known as multiple personality disorder, is a mental health condition characterized by the presence of two or more distinct identities or personality states within an individual. These identities may take control of the person's behavior and memory at different times.

In most cases, DID begins in childhood as a result of unbearable experiences. Children who have experienced trauma, such as physical or sexual abuse, neglect, or other forms of significant emotional distress, may develop DID as a way to cope with and dissociate from these overwhelming experiences. Dissociation serves as a defense mechanism to protect the individual from the pain and emotional turmoil associated with their traumatic past.

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The molar mass of a 0.314-gram sample of gas having a volume of 1.6L at 287K and 0.92 atm is 0.503g/mol.

The temperature and pressure of a gas that behaves like an ideal gas is directly proportional to one another.

First, calculating molar mass :

The molar mass of a substance can be calculated by dividing the mass of the substance by its number of moles.

However, the number of moles can be calculated using the formula:

PV = nRT

From where;

P = pressure

V = volume

R = gas law constant

T = temperature

n = number of moles

0.92 × 1.6 = n × 0.0821 × 287

1.47 = 23.56n

n = 1.47/23.56

n = 0.624 moles

Molar mass = 0.314 g ÷ 0.624 mol

Molar mass = 0.503 g/mol

Therefore, the molar mass of a 0.314-gram sample of gas having a volume of 1.6L at 287K and 0.92 atm is 0.503g/mol.

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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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Using the conservation of mass law, we know that the total mass of the reactants must be equal to the total mass of the products. In this case, we have 0.115 g of hydrogen reacting with an unknown mass of oxygen to give 1.024 g of water.

We can calculate the mass of oxygen by subtracting the mass of hydrogen and water from the total mass of the products: Total mass of products = mass of hydrogen + mass of water = 0.115 g + 1.024 g = 1.139 g, Mass of oxygen = total mass of products - mass of hydrogen - mass of water = 1.139 g - 0.115 g - 1.024 g = 0.0008 g. Therefore, the mass of reacting oxygen is 0.0008 g.The answer is (e) none of the above.

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The name for a positive ion is a cation.

The best way to explain how baking a cake or frying an egg is a chemical change is that the end products of both cannot be reversed to their original forms. Thus, option D is correct.

In both baking a cake and frying an egg, the process involves a chemical reaction that causes a permanent change in the substances involved. In baking, the ingredients undergo a chemical transformation through reactions such as the interaction of flour, sugar, eggs, and leavening agents like baking powder or baking soda.

The heat applied during baking causes these reactions to occur, resulting in the formation of a completely new substance with a different structure, texture, and taste.

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Your question is incomplete, most probably the full question is this:

Which of the following is the best way to explain how baking a cake or frying an egg is a chemical change?

A. Both are changing size and shape.

B Heat is changing the texture of both substances.

C Heat is being added to both, causing a phase change.

D The end products of both cannot be reversed to their original forms.

Answer: Velocity is a mathematical vector. That means it has both a magnitude (speed) and a direction. Scientists need to consider an object’s velocity to calculate its momentum — its velocity multiplied by its mass. Scientists use measures of velocity in everything from figuring out how much rain is falling to sending a rocket to space.

Explanation: Hope this help:)

Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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Answer:

1. thermometer

2. thermal energy

3. specific heat

4. temperature

5. Celsius

6. heat

7. mass

Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

Answer:

The volume will remain the same.

Explanation:

The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles's law)

There are so many gas laws like Charles's law, Avogadro’s law, Boyle 's law and many more. If pressure of gas is kept constant, then volume of the gas will be increasing.

According to Charles's law, gas expands on heating. At constant pressure, volume well be directly proportional to temperature.

According to ideal gas equation

PV=nRT

On keeping pressure constant the following equation can be deduced to Charles's law as

V₁÷T₁=V₂÷T₂

where,

V₁= initial volume

V₂= final volume

T₁=initial temperature

T₂=final temperature

According to Charles's law, the volume of a given gas sample is directly proportional to its absolute temperature at constant pressure.

Therefore, if pressure is kept constant, then volume of the gas will be increasing.

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.

its electrical energy -------> light and heat

Hope this helps

mark brainliest if helpful

Answer:

C

Explanation:

Potential energy is obtained by an object's positioning so the first and last choice cannot be correct.

Of course the electrical energy is not destroyed so that one's not correct either.

The energy conversion that takes place must be electrical energy to light and heat.

Start by setting up your materials you would put one plant in mulch and one without. After 2-3 weeks of proper care of the plants you record your findings, did the plant grow more without without the mulch?

The maximum amount of NaNO3 that can be produced is equal to the number of moles of NaCl used in the experiment divided by two.

To determine the maximum amount of NaNO3 that was produced during the experiment, the balanced chemical equation and the limiting reactant should be determined.

Here is an explanation to answer your question:

Balance the chemical equation:2 NaCl(aq) + H2SO4(aq) → 2 HCl(g) + Na2SO4(aq)

Sodium chloride reacts with sulfuric acid to produce hydrogen chloride and sodium sulfate. Two moles of NaCl and one mole of H2SO4 are needed to make two moles of HCl and one mole of Na2SO4. This balanced chemical equation is critical to determine the maximum amount of NaNO3 produced.Find the limiting reactant:

The amount of NaNO3 produced in the experiment is determined by the limiting reactant. This is the reactant that runs out first and thus determines the quantity of product generated. The limiting reactant can be determined by comparing the amount of each reactant present in the experiment with the mole ratio in the balanced chemical equation.

Once the amount of NaCl and H2SO4 used in the experiment are determined, they can be converted to moles by dividing by their respective molar masses. The mole ratio of NaCl to NaNO3 in the balanced chemical equation is 2:1. As a result, the maximum amount of NaNO3 that can be produced is equal to the number of moles of NaCl used in the experiment divided by two.

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Answer:

please

. please

Explanation:

ANZFWZIQBQ

Answer:

A conversion factor is a variable that transforms the dimension of one variable into the terms of another variable.

Explanation:

Let be \(x\) and \(y\) two variables with diferent dimensions (units), \(r\) is a conversion if transforms the dimension of one variable into the terms of the other variable. That is:

\(y = r\cdot x\) (1)

Where:

\(x\) - Input, [input unit]

\(y\) - Output, [output unit]

\(r\) - Conversion factor, [output unit] per [input unit]

Answer:

d

Explanation:

Answer:

D

Explanation:

help me on my work please

If a solution is diluted by doubling its volume with water, its concentration will be reduced by half.

This is because the amount of solute remains the same, but the volume of the solution has increased. Therefore, the concentration, which is the amount of solute per unit volume, will be diluted by a factor of 2. For example, if a solution originally had a concentration of 1 M, it would become 0.5 M after dilution with water.
When a solution is diluted by doubling its volume with water, its concentration will be reduced to half of the original concentration. This occurs because the amount of solute stays constant while the volume of the solution increases, resulting in a lower concentration.

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The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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The outer shell of the given element was determined as illustrated must be a noble gas. Therefore, option D is correct.

Noble gases can be described as the 6 elements that are organized in group 18 of the modern periodic table. The noble gases are Helium, Neon, Argon, Krypton, Xenon, and Radon.

Under standard temperature and pressure, noble gases exist in the gaseous form and possess low reactivity. Therefore, noble gases are also referred to as inert gas.  All the noble gases exhibit stable electronic configurations in their valence shell that are completely filled. Noble gases generally exist as monoatomic.

The general outer configuration of the noble gases can be written as ns²np⁶,  n is the principal quantum number. Therefore, the given electron dot diagram has eight electrons in its valence shell so it is representing a noble gas.

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