Which two phase transitions can liquid undergo? (2 answers)
A. melting
B. depostion
C. vaporization
D. freezing
E. sublimation
​

Both students have correctly prepared a 1.0 M aqueous solution of potassium phosphate.

To determine which student has correctly prepared a 1.0 M aqueous solution of potassium phosphate (K₃PO₄), we need to compare their procedures.

Jennifer filled a 1.0 liter volumetric flask to calibration line having with water and then weighs out 212.3 g of potassium phosphate to add to the flask.

Joe, on the other hand, weighs out 212.3 g of the potassium phosphate as well as adds it to a 1.0 liter volumetric flask. He then fills the flask to the calibration line with water.

To determine the correct preparation method, we need to consider the molar mass of potassium phosphate (K₃PO₄), which we calculated previously as 212.27 g/mol.

Comparing the two methods;

Jennifer uses the correct amount of potassium phosphate (212.3 g), which corresponds to approximately 1 mole of K₃PO₄.

Joe also uses the correct amount of potassium phosphate (212.3 g), which corresponds to approximately 1 mole of K₃PO₄.

Both students have used the correct amount of potassium phosphate, which matches the molar mass of K₃PO₄. Therefore, both students have correctly prepared a 1.0 M aqueous solution of potassium phosphate.

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

"An experiment in chm 2045 requires students to prepare a 1.0 M aqueous solution of potassium phosphate. Jennifer fills a 1.0 liter volumetric flask to the calibration line with water. She then weighs out 212.3 g of potassium phosphate and adds it to the volumetric flask. Joe weighs out 212.3 g of potassium phosphate and adds it to a 1.0 liter volumetric flask. He then fills the volumetric flask to the calibration line with water. Which student has correctly prepared a 1.0 M aqueous solution of potassium phosphate?"--

The limiting reagent if 44 g of Copper combines with 33 g AgNO3 in Cu + AgNO3 --> Ag + Cu(NO3)2 is AgNO3.

To determine the limiting reagent when 44 g of Copper (Cu) combines with 33 g of AgNO3 in the reaction 2b: Cu + AgNO3 → Ag + Cu(NO3)2, follow these steps:

1. Find the molar mass of each reactant:
Cu: 63.55 g/mol
AgNO3: 169.87 g/mol (107.87 for Ag + 14 for N + 3*16 for O)

2. Calculate the moles of each reactant:
Moles of Cu = 44 g / 63.55 g/mol ≈ 0.692 moles
Moles of AgNO3 = 33 g / 169.87 g/mol ≈ 0.194 moles

3. Compare the mole ratio of the reactants to the coefficients in the balanced equation:
Cu/AgNO3 = (0.692 moles)/(0.194 moles) ≈ 3.57

The balanced equation shows a 1:1 ratio of Cu to AgNO3, but in this case, there is approximately 3.57 times more Cu present than AgNO3.

4. Determine the limiting reagent:
Since AgNO3 is present in lesser proportion compared to the balanced equation, it is the limiting reagent.

So, the limiting reagent when 44 g of Copper combines with 33 g AgNO3 in the reaction 2b is AgNO3.

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According to the stoichiometry of the mentioned chemical reaction,2.40 moles of NaOH are produced from 1.20 moles of Na₂O.

Stoichiometry  is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is used in balancing chemical equations for the law of conservation of mass to be implemented.

According to the reaction, as 1 mole  of sodium oxide produces 2 moles of NaOH , therefore 1.20 moles of sodium oxide will produce 1.20×2/1=2.40 moles of sodium hydroxide.

Thus, 2.40 moles of NaOH are produced from 1.20 moles of Na₂O.

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Answer:

Metal

Element: Calcium

Valency: 2

Explanation:

To find the element, let's use the periodic table. (Look below)

We already went past 3 shells, just need the 2 electrons after it.

Just skip to the 4th row and count 2 to the right

We end up at Calcium.

Calcium is a metal and we're also on the alkaline earth metals column.

Calcium will need to lose 2 electrons to reach stability, so the valency is 2.

x CO₂  = 0.236

x H₂  = 0.764

Given

P CO₂ = 217 mmHg

P H₂ = 703 mmHg

Required

The mole fraction

Solution

Dalton's law :

The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases  

Can be formulated:  

P tot = P1 + P2 + P3 ....  

P tot for the mixture :

= 217 mmHg + 703 mmHg

= 920 mmHg

Mole fraction of each gas :

x CO₂ = 217 mmHg/920 mmHg = 0.236

x H₂ = 703 mmHg/920 mmHg = 0.764

Answer:

the escape velocity

Explanation:

To do this, your rock has to go very fast – more than 11 kilometers per second. This velocity is called the escape velocity, the speed an object must achieve in order to overcome the gravitational attraction of a celestial body (be it a planet, a star, or a galaxy) and escape into space

found it online, lol better then nothing

The balanced equation for the reaction between NO and O2 is given below;

2NO + O2 → 2NO2

The amount of NO used is greater than the amount of NO given.Therefore, O2 is the limiting reactant. The number of moles of NO2 produced is 0.0157 mol.

The balanced equation for the reaction between NO and O2 is given below;

2NO + O2 → 2NO2

Molar mass of NO = 30 g/mol

Molar mass of O2 = 32 g/molar

Calculate moles of NO and O2 in the reaction;

Moles of NO = Mass / Molar mass = 0.886 / 30 = 0.0295 mol

Moles of O2 = Mass / Molar mass = 0.503 / 32 = 0.0157 mol

b) Determine the limiting reactant;

To determine the limiting reactant, we compare the moles of the reactants with their coefficients in the balanced equation.

Moles of NO = 0.0295 mol

Coefficient of NO = 2

Moles of O2 = 0.0157 mol

Coefficient of O2 = 1

For NO,

Moles of NO used = 2 x Moles of O2 used = 2 x 0.0157 = 0.0314 mol

So, the amount of NO used is greater than the amount of NO given.Therefore, O2 is the limiting reactant.

c) Calculate the moles of NO2 produced;

The number of moles of NO2 produced is equal to the number of moles of the limiting reactant. Since the limiting reactant is O2,

Moles of NO2 = Moles of O2 = 0.0157 mol

Therefore, the number of moles of NO2 produced is 0.0157 mol.

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The efficiency of this power plant that combusts methane to produce electricity is 4.8%.

Given the area of methane = 37,500,000 cubic yards

The power of electricity = 61,626,000 kWh

It is given that the power plant combusts methane to produce electricity.

We know that the efficiency of power is equal to the electricity generated divided by the energy used for combustion.

1 yard^3 = 27ft^3

37,500,000 cubic yards x 27 = 1,012,500,000 cubic feet

Efficiency = energy output/energy input

Efficiency = (61,626,000 kWh) / 1,012,500,000 cubic feet

Here, BTU is the common unit of energy so,

1,012,500,000 cubic feet of methane = 5,072,500,000,000 Joules where 1 Joule = 0.0009478 BTU

5,072,500,000,000 Joules x 0.0009478 = 4,787,039,500,000 BTU

We know that 1 kWh = 3412 BTU then,

61,626,000 kWh = 61,626,000 *  3412 BTU = 210,343,312,000 BTU

efficiency = 210,343,312,000 BTU / 4,787,039,500,000 BTU = 0.0438%

Efficiency = 4.38%

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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Because it is a superior light absorber, a darker item emits heat more effectively. A white object, on the other hand, appears white because it reflects all the various wavelengths of light and absorbs little to no light.

Here the black can seems to absorb more radiation and it is hotter as compared to the silver can.

A black item absorbs all light waves and transforms them into heat, which causes the object to warm up. A white object reflects all visible light wavelengths, preventing heat from being produced and a noticeable rise in temperature.

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Entropy of the system after salt crystals dissolve completely is higher than the entropy of the system after adding water.

Entropy is defined as the measure of the disorder of a system. Entropy also describes how much energy is not available to do work. The more disordered a system and higher the entropy, the less of a system's energy is available to do work.The experiment begins with crystalline salt at the bottom of an otherwise empty glass. Rate the entropy of the water. system during this process from highest entropy to the lowest entropy. Entropy always increases after a process. The entropy of the system after the salt dissolves completely is higher than the entropy of the system shortly after mixing begins and that is higher than the entropy of the system after adding water.

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Answer:

The eccentricity of the ellipse is 0.252.

Explanation:

The eccentricity of an ellipse (\(c\)), dimensionless, can be determined by means of the following expression:

\(e = \frac{\bar c}{\bar a}\) (1)

Where:

\(\bar c\) - Distance between the foci, dimensionless.

\(\bar a\) - Length of the major axis, dimensionless.

If we know that \(\bar c = 5.2\) and \(\bar a = 20.6\), then the eccentricity of the ellipse is:

\(e = \frac{5.2}{20.6}\)

\(e = 0.252\)

The eccentricity of the ellipse is 0.252.

Answer:

0.25moles

Explanation:

There are 1000\(cm^{3}\) for 1\(dm^{3}\)

Therefore in 1000\(cm^{3}\) of 0.5 mol/\(dm^{3}\) solution has = 0.5 moles

Therefore 500\(cm^{3}\) contains = 0.5/1000 x 500 = 0.25moles

The number of moles of sulfuric acid in 0.5 mol/dm³ solution is equal to 0.25 mol.

The concentration of the solution can be determined as the number of moles of a solute in per unit volume of a solution is known as molarity or molar concentration.

The Molarity of the solution is calculated in the following formula:

Molarity (M) = Moles (n)/Volume of the Solution (in L)

Now if we have to find the number of moles of solute in the solution, the formula becomes:

Number of moles of solute (n) = Molarity (M) × Volume of the Solution

Given, the concentration of the sulfuric acid solution = 0.5 mol/dm³

The volume of the solution, V = 500 cm³

As we know, 1 dm³ = 10³ cm³, the volume of solution = 0.5 dm³

The number of moles of the sulfuric acid = M × V

= 0.5 × 0.5 = 0.25 mol

Therefore, 0.25 moles of sulfuric acid in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid.

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One serving of peanuts has about 166.000 calorie then in joules are  695,000 Joule means  694.544 Joule and 'joule is the amount of energy exerted when a force of one newton is applied over a displacement of one meter'

A calorie is a unit of energy in nutrition, calories refer to the energy people get from the food and drink they consume, and the energy they use in physical activity and calories are listed in the nutritional information on all food packaging many weight loss programs center around reducing the intake of calories.

Here given data is peanuts = 166.000 calories given in the calories then we have to find in joules = ?

In the thermochemical calories to joule we have one given value i.e

1cal th = 4.184 J means here 1 cal  =  4.184 J

So, we have to calculate 166.000 calories

Then, 4.184×166.000

= 694.544 J

Which is approximately 695,000 J

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Answer:Since there is virtually nothing in space to scatter or re-radiate the light to our eye, we see no part of the light and the sky appears to be black.

Explanation:

The process of oxidation occurs when a reactant loses electrons during a reaction.

Al 3+ +3e −  →Al.

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The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass starting with grams of a radioactive isotope, 2.3g will be left after half-lives.

Starting with the isotope of 150g, after half-life the amount is reduced to

150g/2 = 75g, half the original amount.

This can be written as :

150g(1/2)¹

After the second half life:

75g/2 = 37.5 g

= 150g/ 4 = (150g) (1/2)²

But now we can see a pattern For each new half-life divide the amount by 2 to the first power so the number of half-lives is It grows, so it develops.

Then, We can then take the original amount and quickly calculate the half-life of 6 half life:

(150g)(1/2)⁶

=(150g)(1/64) = 150g/64

= 2.3g

The time it takes the isotope to do this depends on the isotope in question. And over other years and decades, the isotope usually decays into another element or isotope.

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When the equation is balanced, the coefficient of octane is 2.

A chemical equation is a representation of a chemical reaction in the form of symbols and formulae, where reactants are written on the left and products on the right. An equation must be balanced so that it follows the law of conservation of mass, which states that mass cannot be created nor destroyed in a chemical reaction. There are different ways to balance an equation, but the most common method is using coefficients.

Coefficients are whole numbers that are used to balance the number of atoms or molecules on each side of the equation. In the equation:-

C₈H₁₈ + O₂ → CO₂ + H₂O

there are 8 carbon atoms, 18 hydrogen atoms, and 2 oxygen atoms on the reactant side. On the product side, there are 1 carbon atom, 3 oxygen atoms, and 2 hydrogen atoms. To balance the equation, the coefficient of octane (C₈H₁₈) is set to 1.

This means that there is only 1 molecule of octane in the reaction. The coefficients of oxygen, carbon dioxide, and water are then adjusted accordingly to balance the number of atoms on both sides of the equation. The balanced equation is:-

C₈H₁₈ + 12.5O₂→ 8CO₂ + 9H₂O

or

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Therefore, the correct option is 2.

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Answer:

trimolecular

Explanation:

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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The substance that Channel X transmits would be the smallest substance dissolved in the extracellular fluid, which is likely to be potassium ions .

Channel X only transmits the smallest substances dissolved in the extracellular fluid through the axon membrane. . It would not be proteins as they are generally too large to be dissolved in the extracellular fluid, and sodium ions are not necessarily the smallest substance dissolved in the extracellular fluid. These channels are found in the axon membrane of neurons, and act as a gate that can open and close to allow the passage of potassium ions through the membrane. This allows the neuron to regulate the electrical potential across the membrane, and thus control the flow of electrical signals.

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Scene A depicts physical change while scene B depicts chemical change. chemical change results in different physical properties. chemical change results in change of state.

When two or more molecules interact, chemical changes take place at the molecular level. Atomic bonds that are formed or broken during chemical reactions result in chemical changes. Changing one or more of the physical properties of a substance without affecting its chemical properties is referred to as a physical change. In other words, a physical change does not result in matter changing into a different substance. Physical changes include those that affect the condition of matter, such as melting, boiling, and freezing. Chemical change, or chemical reaction, is a change in matter that results in the creation of one or more new substances. Atoms rearrange to create new compounds during a chemical reaction, giving them new physical qualities.

the complete question is- Scenes A and B depict changes in matter at the atomic scale: (a) Which show(s) a physical change? (b) Which show(s) a chemical change? (c) Which result(s) in different physical properties? (d) Which result(s) in different chemical properties? (e) Which result(s) in a change in state?

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Answer:

Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.Boiling occurs when a liquid changes to a gas below its surface as well as at the surface. The temperature at which a liquid boils is called its boiling point. The opposite of vaporization is called condensation. Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.

Answer:

A dunes windward side is the side where the wind is blowing and pushing material up. A dunes slip face is simply the side without wind. A slipface is usually smoother than a dunes windward side. A collection of dunes is called a dune belt or dune field.

Explanation:

Hope this helps...

By integrating the differential equation and determining the residence time at which the conversion reaches 80%, we can find the space time needed. The goal is to minimize the percentage of error in the calculation.

To solve this problem, we need to set up and solve the differential equation for the plug flow reactor. The rate equation given is γA = 10^(-2)C^(1/2) (mol/lit bee), where γ is the reaction rate constant and C is the concentration of A.

The differential equation for the plug flow reactor can be written as:

dCA/dV = -rA

Where CA is the concentration of A, V is the reactor volume, and rA is the rate of reaction. Since the reaction is homogeneous and follows the stoichiometry A → 3R, the rate of reaction is given by:

rA = -1/3 dCA/dt

Using the chain rule, we can rewrite the differential equation as:

dCA/dV = -1/3 dCA/dt dV/dt

The volume V is related to the reactor residence time τ (space time) by:

V = F₀τ

Where F₀ is the inlet molar flow rate. In this case, the feed consists of 50% A and 50% inert, so the inlet molar flow rate is 0.0325 mol/lit * 0.5 = 0.01625 mol/lit.

Now, we can substitute the expressions for V and dV/dt into the differential equation and rearrange it as:

(1/τ) dCA/dτ = -1/3 dCA/dt

To solve this differential equation numerically, we can use a method like the fourth-order Runge-Kutta method. We start with the initial condition CA = CA₀ at τ = 0 and integrate the differential equation until the conversion reaches 80% (CA = 0.0325 * 0.5 * 0.2 = 0.00325 mol/lit).

By varying the residence time τ and checking the conversion, we can determine the residence time at which the conversion is closest to 80%. This residence time will give us the space time needed for 80% conversion.

To minimize the percentage of error in the calculation, we can adjust the step size in the numerical integration method to achieve a desired level of accuracy. Smaller step sizes generally lead to more accurate results but require more computational effort.

By implementing the numerical integration method and adjusting the step size, we can find the space time needed for 80% conversion with minimized error.

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If the volume is decreased to 2.6 L and pressure is decreased to 3.2 atm, then temperature become 156.98K.

This problem can be solved by using the concept of Ideal gas equation.

The equation of ideal gas can be expressed as

PV = nRT

where,

P is the pressure of the gas

V is the volume taken

n is the number of moles of the gas

R is the gas constant = 6.314 J/ mol K

T is the temperature

Now from given data, we have the values of

V = 3.2 L

P = 5.5 atm

T = 53°C = 273 + 53 = 326 K

By substituting all the values, we get the value of n

3.2 × 5.5 = n × 6.314 × 326

17.6 = n × 2058.36

n = 17.6 / 2058.36

n = 0.0085 mol

Now, we have to find the temperature

n = 0.0085 mol

V = 2.6 L

P = 3.2 atm

By substituting all the values, we get

3.2 × 2.6 = 0.0085 × 6.314 × T

8.32 = 0.053 T

T = 8.32/ 0.053

T = 156.98 K

Thus, we concluded that if the volume is decreased to 2.6 L and pressure is decreased to 3.2 atm, then temperature become 156.98K.

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Answer: a

Explanation:

The inflation rate from 2014 to 2015, assuming 2014 as the base year, is 68.09%.

The inflation rate from 2014 to 2015, assuming that 2014 is the base year, can be determined using the Consumer Price Index (CPI). The CPI measures the cost of goods and services over time and is used to calculate inflation. The formula for calculating inflation rate using CPI is as follows: Inflation rate = ((CPI year 2 - CPI year 1) / CPI year 1) x 100To solve this problem, we first need to calculate the CPI for each year using the prices and quantities of nuts and meat.

Calculating CPI for 2014:CPI 2014 = (300 x $9) + (175 x $19) = $5,625 Calculating CPI for 2015:CPI 2015 = (420 x $9) + (340 x $14) = $9,460Using the CPI formula, we can calculate the inflation rate from 2014 to 2015:Inflation rate = ((CPI 2015 - CPI 2014) / CPI 2014) x 100= (($9,460 - $5,625) / $5,625) x 100= $3,835 / $5,625 x 100= 68.09% (to 2 decimal places) Therefore, the inflation rate from 2014 to 2015, assuming 2014 as the base year, is 68.09%.

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The mass of one methane molecule is 2.7\times 10^(-23) gram. Then the mass of 60,000 methane molecules is 1.62 × 10⁻¹⁹ grams.

Given that the mass of one methane molecule is 2.7 × 10⁻²³ grams, we can calculate the mass of 60,000 methane molecules by multiplying the mass of one molecule by the number of molecules.

Mass of 60,000 methane molecules = (2.7 × 10⁻²³ grams/molecule) × (60,000 molecules)

To multiply these values, we can multiply the coefficients (2.7 and 60,000) and add the exponents of 10.

2.7 × 60,000 = 162,000

Since the exponent of 10 in the mass of one molecule is -23 and we are multiplying by 60,000, the exponent of 10 will be -23 + 5 = -18 (moving the decimal point 5 places to the right).

Therefore, the mass of 60,000 methane molecules is 1.62 × 10⁻¹⁹ grams.

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