which substance is a mixture? A. table salt B. gasoline C. aluminium D. carbon dioxide​

The mass of Zn produced on the iron nail  is similar/ equal to the mass of Zn lost from the Zn electrode. Hence no loss of mass.

Mass of Zn produced in iron nail= 0.630g -0. 610g = 0.01g

Mass of Zn consumed = 5.720 to 5.710 g = 0.01g

Given length of time run= 5 min = 5× 60 = 300 second

Moles of Zn passed = 0.001g = 0.00015 mol

1 mol contain = 6.022×10^23 atoms

Total electron contain in 0.00015 mol of Zn atoms

= 0.00015 × 30 ×6.022× 10^23

= 0.00461 × 6.022 × 10^23

Therefore, number of moles of electron transferees = 0.00461×6.022×10^23 / 6.022×10 ^23

= 0.00461 mol

From the Faraday first law of electrolysis

I = mF / Et

= 0.01 × 96500/32.7×200

= 0.098 mps

The mass of Zn produced on the iron nail  is similar/ equal to the mass of Zn lost from the Zn electrode. Hence no loss of mass.

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Polar covalent bonds allow hydrophilic substances to interact with water. Polar covalent bonds allow hydrophilic substances to interact with water. In a polar covalent bond, the electrons are unequally shared between the atoms, resulting in partial positive and partial negative charges.

Polar covalent bonds occur when there is an unequal sharing of electrons between atoms, resulting in a partial positive charge on one atom and a partial negative charge on another. This polarity allows polar molecules or ions, such as hydrophilic substances, to form favorable interactions with water molecules through hydrogen bonding, which occurs between the positive hydrogen atoms in water and the negative regions of the polar molecule.

The presence of polar covalent bonds in a substance enables it to be hydrophilic, meaning it has an affinity for water. This interaction is crucial in many biological processes, as water serves as a universal solvent and plays a vital role in the dissolution, transport, and reactions of hydrophilic substances. The polarity of the covalent bonds allows for the formation of hydrogen bonds with water, facilitating the solubility and interaction of hydrophilic substances in aqueous environments.

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Answer:

A molecular formula tells us what atoms and how many of each type of atom are present in a molecule.

Explanation:

If only one atom of a specific type is present, no subscript is used.

For atoms that have two or more present, a subscript is written after the symbol for that atom.

Molecular formulas do not indicate how the atoms are arranged in the molecule.

- Hope this helps! -blazetoxic123

In a molecular formula, the subscripts represent the number of atoms of each element present in a molecule.

The molecular formula gives you the specific combination and quantity of atoms that make up a single molecule of a compound.

For example, consider the molecular formula of water, which is H₂O:

"H" represents hydrogen.

"O" represents oxygen.

The subscript "2" next to "H" indicates that there are two hydrogen atoms in one molecule of water.

The absence of a subscript next to "O" means that there is only one oxygen atom in one molecule of water.

So, the molecular formula H₂O tells us that a water molecule is composed of two hydrogen atoms and one oxygen atom bonded together.

Here are a few more examples to illustrate the importance of subscripts in molecular formulas:

Methane: CH₄ (One carbon atom and four hydrogen atoms)

Carbon dioxide: CO₂ (One carbon atom and two oxygen atoms)

Ethanol: C₂H₅OH (Two carbon atoms, six hydrogen atoms, and one oxygen atom)

The subscripts are crucial in distinguishing between different compounds with the same elements. For instance, carbon monoxide (CO) and carbon dioxide (CO₂) have different molecular structures and properties, even though they both contain carbon and oxygen. The subscripts in the molecular formula help to specify the unique arrangement of atoms within each molecule.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used. Therefore, the combined formula is PVM=mRT.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Real gas behave like an ideal gas at low pressure and high temperature. There is no forces of attraction or repulsion between the particles of ideal gas.

The formula that comes by combining  PV = nRT and  n = m/M is

PV = nRT

PV =( m/M )RT

PVM=mRT

From this formula we can find the molar mass easily.

Therefore, the combined formula is PVM=mRT.

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hi <3

for this conversion, you need to multiply by 10^6

thus, your answer would be 75000 mm

hope this helps :)

The Potassium chlorate, KClO₃ is a non-polar substance which is least soluble or less solubility in water at 60° C. So, option( 1) is right one.

In chemistry, solubility is the ability of a substance, say the solute to form a solution with another substance that is the solvent. The main property is that substances with similar polarities tend to be soluble in one another ("like dissolves like"). The degree to which a salt dissolves in water is called the it's solubility product constant. Now, here temperature = 60°C

Potassium nitrate KNO₃ is more-soluble than potassium chlorate KClO₃ due to on heating the saturated solution. At 60 degrees C, NaNO₃ has a solubility rate is 110 grams NaNO3 per 100 grams of water. So, it is more soluble than KNO₃. Now, NH₃ and KI both are polar in nature so, they are soluble in water. So, the least soluble is KClO₃.

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Answer:

CaCO3 + H2O

Step by step explanation

The compound E F and H are in the higher energy ring flip

Higher energy cyclic organic compounds are cyclic organic molecules that have a higher potential energy than other molecules with the same ring size.

This higher energy is due to the angle strain, torsional strain, or steric hindrance present in the cyclic structure, which causes the molecule to be less stable and have a higher potential energy.

Overall, higher energy cyclic organic compounds are generally less stable and more reactive than other cyclic organic compounds due to the strain present in their ring structures.

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The pH of H2SO4 is 1.20×10–2.

We need to determine the pH of a 0.310 M solution of H2SO4.In order to find pH, we'll need to find the [H+] of the solution.

At equilibrium, the concentration of H+ will be twice that of the initial concentration of H2SO4.

Thus, [H+] = 2 × 0.310 = 0.620 M

The concentration of [SO42-] will also be 0.310 M.

Using the Ka2 expression for H2SO4 gives:

Ka2 = ([H+][SO42-])/[H2SO4]1.20 × 10-2 = (0.620 x 0.310)/[H2SO4][H2SO4] = 0.12 M

The [H+] in the solution is 2 × 0.310 = 0.620 M,

so:

pH = -log([H+]) = -log(0.620) = 0.2064 (rounded to four significant figures)pH = 0.21 (rounded to two significant figures)

Therefore, the pH of a 0.310 M solution of H2SO4 is 0.21.

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Answer :  The acid ionization constant (Ka) for the given acid HA is 1.1 x 10^(-5), rounded to two significant figures.

To calculate the acid ionization constant (Ka) for the given acid HA, we must first find its pH using the given concentration of the solution. Then, we can use the pH to find the concentration of H+ ions in the solution. Finally, we can plug these values into the expression for Ka to solve for the acid ionization constant.

The pH of the 0.120 M solution of HA is given to be 3.28. This means that [H+] = 10^(-pH) = 10^(-3.28) = 5.01 x 10^(-4) M.
Now, we can use the expression for Ka: Ka = [H+][A-]/[HA],  Since HA is a weak acid, we can assume that it dissociates as follows: HA + H2O ⇌ H3O+ + A- This means that [A-] = [H3O+], and [HA] = initial concentration of the acid (0.120 M) - [H3O+].

Substituting these values, we get: Ka = (5.01 x 10^(-4) M)^2 / (0.120 M - 5.01 x 10^(-4) M) = 1.1 x 10^(-5). Therefore, the acid ionization constant (Ka) for the given acid HA is 1.1 x 10^(-5), rounded to two significant figures.

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2.87 kg will be equal to 2870 grams, when converted using the metric system.

The metric system is a decimalized system of measurement used in many parts of the world. It is based on a decimal system, where the base unit of measurement is the gram. The metric system is the most common system of measurement used in the world today and is used in many scientific and medical applications.

It is based on the decimal system, where units of measurement are based off of a single base unit. It is also easy to convert from one unit of measurement to another, as the conversions are based on multiples of ten. This makes it easier to use and understand and is beneficial in many applications.

In order to convert 2.87 kg to grams, the following steps can be taken:

1. Multiply 2.87 kg by 1000, as there are 1000 grams in 1 kg.

2. 2.87 kg x 1000 = 2870 g

Therefore, 2.87 kg is equal to 2870 grams when using the metric system.

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The mole fraction of oxygen gas is 0.290

First we will calculate the total pressure by adding the partial pressure of all gases as follows:

Partial pressure of CH₄= 143 mmHg

Partial pressure of N₂= 469mmHg

Partial pressure of O= 251mmHg

Total pressure = partial pressure of CH₄+ partial pressure of N₂+ partial          pressure of O₂

Total pressure= 143+ 469+ 251

                        =863mmHg

Finally we will calculate the mole fraction of O₂ with the help of formula written below:

Mole fraction=\(\frac{partial pressure }{total pressure}\)

Mole fraction of O₂=\(\frac{251}{863}\)

Mole fraction of O₂= 0.290

Therefor answer will be 0.290

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The volume of C₂H₂ : 28 L

Given

45g of water

Required

The volume of C₂H₂

Solution

Reaction

CaC₂(s) + 2 H₂O(l) ⇒ C₂H₂(g) + Ca(OH)₂(aq)

mol of water (MW = 18 g/mol) :

mol = mass : MW

mol = 45 g : 18 g/mol

mol = 2.5

From equation, mol ratio H₂O : C₂H₂ = 2 : 1, so mol C₂H₂ :

= 0.5 x mol H₂O

= 0.5 x 2.5

= 1.25

The volume of C₂H₂(assume at STP, 1 mol = 22.4 L) :

=1.25 mol x 22.4 L

=28 L

Answer:

the answer on acellus is 2, 3 , 2

The heat transfer from the refrigerant per unit mass is -198.16 kJ/kg.

Pressure of the refrigerant (P) = 900 kPa Temperature of the refrigerant (T) = 60°C Refrigerant leaves the condenser as saturated liquidThe first step is to determine the state of the refrigerant at the inlet and outlet of the condenser using refrigerant tables. Since the refrigerant leaves the condenser as a saturated liquid, it is at a saturated state at the outlet of the condenser.

The table values for R-134a refrigerant is given below: Pressure (kPa)  | Enthalpy (kJ/kg) | Specific Volume (m3/kg) | Temperature (°C) 900                | 272.82                   | 0.01999                    | 60At the inlet of the condenser:

Temperature (T) = 60°C = 333.15 K

Specific Enthalpy (h1)

= 272.82 kJ/kg

At the outlet of the condenser:

Pressure (P) = 900 kPa Specific Enthalpy (h2)

= hfg + hf= 197.16 + 272.82

= 470.98 kJ/kg Heat transfer from the refrigerant per unit mass can be calculated as follows:

q = h1 - h2

q = 272.82 - 470.98

q = -198.16 kJ/kg

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A solute dissolves in excess solvent to form a solution:

                            solute + solvent → solution

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.

A solution is a uniform mixture of two or more components that can exist in the solid, liquid, or gas phases. The amount of heat that is released or absorbed during the dissolving process is known as the enthalpy change of solution (at constant pressure).

There are two possible values for this enthalpy of solution ( H solution ) : positive (endothermic) and negative (exothermic). It is most straightforward to visualize a hypothetical three-step process occurring between two substances while trying to grasp the enthalpy of solution. The solute is one substance; let's call it A. The solvent is the second component; let's call it B.

The initial procedure exclusively affects the solute A and calls for disabling all intramolecular forces holding it together. This indicates that the molecules of the solute separate. This process' enthalpy is known as H1. Since breaking interactions requires energy, this is always an endothermic process, hence H1>0.

Their sign will be opposite.

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The formula mass of Cu2O is approximately 143.09 u.

The formula mass of a compound is calculated by summing the atomic masses of all the atoms in its chemical formula.

Molecular mass is the sum of the atomic masses of all the atoms in a molecule, while formula mass is the sum of the atomic masses of all the atoms in a formula unit of an ionic compound.

The formula mass of Cu2O is calculated by adding the atomic masses of two copper atoms and one oxygen atom, which gives:

Formula mass of Cu2O = (2 x atomic mass of Cu) + (1 x atomic mass of O)

= (2 x 63.55 u) + (1 x 15.99 u)

= 127.10 u + 15.99 u

= 143.09 u

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Based on this picture (weather map) which shows the snowfall during a snowstorm in New England in 1983, this picture illustrates and indicates the: C. weather conditions in New England, because it shows the precipitation over a few days

In Geography, a weather map can be defined as a type of chart (publication) that is typically used to provide information about the average atmospheric condition of a geographical region over a short period of time.

In Geography, weather can be defined as the average atmospheric conditions of a geographical region (area) over a short period of time. Additionally, there are various elements of weather and these include the following:

By critically observing the given weather map, we can reasonably infer and logically deduce that it represents the average atmospheric conditions of New England because it shows the amount of precipitation over a few days, which is from the 10th of February to 12th of February, 1983.

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Complete Question:

The picture below shows the snowfall during a snowstorm in New England in 1983. What does this picture show?

Control rods are used to control the rate of nuclear fission in a nuclear reactor.

Control rods work by absorbing neutrons, which slows down or stops the nuclear chain reaction in the reactor.The function of control rods in a nuclear reactor is to control the rate of nuclear fission that is taking place in the reactor core. Control rods are made of a material that can absorb neutrons, which are produced during fission. By absorbing neutrons, the control rods reduce the number of neutrons available to cause further fission reactions in the core. This process slows down the chain reaction and reduces the amount of heat that is produced by the reactor. The position of the control rods can be adjusted to regulate the amount of neutron absorption, and thus the rate of fission taking place.

The function of control rods in a nuclear reactor is to control the rate of nuclear fission that is taking place in the reactor core. Control rods work by absorbing neutrons, which slows down or stops the nuclear chain reaction in the reactor. By absorbing neutrons, the control rods reduce the number of neutrons available to cause further fission reactions in the core.

Control rods are an essential safety feature of a nuclear reactor. They are used to prevent the reactor from overheating, which could lead to a meltdown or other dangerous situations. By controlling the rate of fission in the reactor, control rods help to ensure that the reactor operates safely and efficiently.

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Answer:

87.2 liquid quarts (US)

Answer:

B

Explanation:

The student is not able to move the box in D --> 55N, 0N. Since the net force is 0, it means that no force is being applied. So you will choose answer B from your options.

Hope this helps, thank you !!

Because of their differing nuclear charges, and as a result of shielding by inner electron shells, the different atoms of the periodic table have different affinities for nearby electrons.

The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. So the more negative the electron affinity the more favourable the electron addition process is.

Not all elements form stable negative ions in which case the electron affinity is zero or even positive.

Electron affinity depends on the nuclear charge of an atom.

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Explanation:

remember the equation percentage yield = actual/theoretical yield

so 6.26/18.81 X 100 gives u 33.28017012 so to 3 SF ot would be 33.3%

hope this helps:)

The statement, that describes the percent yield is 33.280 g.

The percent yield is the ratio of actual yield to theoretical yield. It is computed by dividing the experimental yield by the theoretical yield and multiplying the result by 100 percent. If the actual and theoretical yields are equal, the percent yield is one hundred percent.

To express the efficiency of a reaction, use the following formula: percent yield

= (actual yield/theoretical yield) x 100

= (6.26 g/ 18.81 g) x 100

= 33.280 g

Hence the correct answer is 33.280 g.

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The contents of each layer are clearly labeled, with the reaction mixture containing the Nylon-6,10 monomers, the water layer containing the water-soluble initiator, and the oil layer containing the nonpolar solvent and the polymerized Nylon-6,10.  

The identity of each layer is indicated by the labeling of the solutions. The reaction mixture is labeled as layer 1, the water layer is labeled as layer 2, and the oil layer is labeled as layer 3.

An interfacial polymerization experiment to synthesize Nylon-6,10 typically involves the following steps:

Preparation of the reaction mixture: A solution of Nylon-6,10 monomers in a solvent is prepared. The monomers can be mixed in equal proportions or in different proportions to control the molecular weight and properties of the resulting polymer.

Preparation of the water layer: A separate solution of a water-soluble initiator is prepared. The initiator is added to the water, which is then stirred to create a homogeneous solution.

In this experiment, the contents and identity of each layer can be represented as follows:

The reaction mixture: A solution of Nylon-6,10 monomers in a solvent (layer 1)

The water layer: A solution of a water-soluble initiator (layer 2)

The oil layer: A solution of a nonpolar solvent, such as hexane (layer 3)

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According to the EPA, the most efficient way to cool or heat a home is through an energy-efficient HVAC system. An HVAC system works by circulating air throughout the home while using less energy than other cooling or heating methods.

Additionally, proper insulation, sealing air leaks, and using programmable thermostats can further improve energy efficiency and reduce costs. It's important to note that regular maintenance and filter changes are crucial to ensure optimal performance and efficiency.


1. Energy Star certified systems are designed to be more energy-efficient, which means they use less energy to provide the same level of comfort as other systems. This helps reduce greenhouse gas emissions and save on energy costs.

2. The EPA recommends regular maintenance of your HVAC system, including cleaning filters and ducts, to ensure optimal performance.

3. Additionally, using a programmable thermostat can help improve efficiency by allowing you to set specific temperatures for different times of the day, reducing energy consumption when it's not needed.

4. Lastly, proper insulation and sealing of your home can also improve the efficiency of your HVAC system by preventing air leaks and retaining the desired temperature.

By following these steps and using an Energy Star certified HVAC system, you can effectively cool or heat your home in the most efficient way.

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The kinetics of first order governs nuclear decay. A rate constant for a nuclide, which decays from 12.9 g to 2.04 g in 23.0 minutes, is 0.08.

identifying the root of the problem. The essential elements of a family, commonly their parents and kids, are referred to as the "nuclear family" in this phrase. Nuclear has a long history of metaphorical usage prior to its main association to "nuclear energy," with its meanings including "core" and even more merely "something basic."

As far as we are aware, the first order reaction rate is provided by:

               kt=2.303*log(R'/R)

We are aware that the following equation determines the rate of a first order reaction:

where k = rate of reaction

          t = time = 23 minutes

         R = end mass = 2.04 grams,

         where R' = beginning mass = 12.9 grams.

We obtain k = 0.08 by plugging these values into the equation above.

i.e., the nuclide's rate constant is 0.08.

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