which of the following solutions is matched with its correct intermolecular force between solute and solvent? a) ch2f2 and f2: dispersion b) ch2f2 and ch2o: hydrogen bonding c) ch2f2 and ph3: dipole-induced dipole d) ph3 and nh3: dipole-dipole e) ph3 and f2: dispersion

The percentage of mercury in the ore : 2.49%

Given

12 g of sample

2.89% HgS

Required

The percentage

Solution

mass of HgS in the ore :

= 2.89% x 12 g

= 0.3468 g HgS

Mass of Hg in HgS :

= (Ar Hg/MW HgS) x mass HgS

= (200.592/232,66 g/mol) x 0.3468

= 0.299 g

% mercury (Hg) in sample(a crude ore) :

= (0.299 g : 12 g) x 100%

= 2.49%

The probability that a system is in a particular state after a large number of periods is dependent on the beginning state of the system.

This is because the probability of transitioning from one state to another is influenced by the current state of the system.

However, as the number of periods increases, the probability of being in a particular state tends to converge to a fixed value, known as the steady-state probability.

This steady-state probability is not necessarily the same for every ending system, as it depends on the transition probabilities between states.

The probability of being in a particular state after a large number of periods can be calculated using Markov chain analysis, which considers the probabilities of transitioning between states over time.

Therefore, options a and d are incorrect, while options b and c partially capture the nature of the system's probability distribution.

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Answer:

radiant - chemical is the best answer

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Hope this helps

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Credit for 2021FOLLOWme

Answer:

HS is stripped from each O.

Answer:

d = 0.6975 g/cm³

Explanation:

d = m/V       d = density      m = mass      V = volume

1 mL = 1 cubic centimeter

d = 2640 g / 3785 cm³

d = 0.6974900925 g/cm³

four significant digits in problem, so four significant digits in answer

\(\\ \rm\rightarrowtail Density=\dfrac{Mass}{Volume}\)

\(\\ \rm\rightarrowtail Density=\dfrac{2640}{3785}\)

\(\\ \rm\rightarrowtail Density=0.697g/mL\)

The marginal cost of the 10th bottle of water produced is calculated as $1.50. The marginal cost of the 10th bottle of water produced is the cost of producing the 10th bottle alone, which includes the additional costs of raw materials, labor, and other expenses.

To calculate this cost, we need to know the total cost of producing the first 9 bottles and the total cost of producing 10 bottles.

Assuming that the cost of producing each bottle of water remains constant, we can use the following formula to calculate the marginal cost: Marginal cost = (Total cost of producing 10 bottles - Total cost of producing 9 bottles) / (10 - 9)

Let's say that the total cost of producing 9 bottles of water is $15.00 and the total cost of producing 10 bottles is $16.50. Using the formula above, we get: Marginal cost = ($16.50 - $15.00) / (10 - 9) = $1.50

Therefore, the marginal cost of the 10th bottle of water produced is $1.50.

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Answer:

1:1

Explanation:

Based on Avogadro's law, the volume of an ideal gas is directly proportional to the moles (Or number of molecules) presents of this gas under constant temperature.

The volume of the gas is independent to the nature of the gas

Using this law, we can change the state as:

X number of molecules of CO₂ in X number of molecules of CH₄ (Because are occupying the same volume). That means the ratio of molecules is:

The value of pKb of propylamine is approximately 4.28.

To determine the pKb of propylamine (C₃H₇NH₂) from the given pH value of its 0.1 M aqueous solution (11.86), we can use the following steps:

1. Calculate the pOH:
pOH = 14 - pH = 14 - 11.86 = 2.14

2. Find the concentration of OH⁻ ions:
[OH⁻] = 10^(-pOH) = 10^(-2.14) = 7.24 x 10³ M

3. Use the expression for Kb, the base dissociation constant:
Kb = ([C₃H₇NH₃⁺][OH⁻])/[C₃H₇NH₂]

Since the initial concentration of propylamine is 0.1 M, and the concentration of OH⁻ ions is 7.24 x 10⁻³ M, we can approximate the concentration of C₃H₇NH₃⁺ to be the same as the concentration of OH⁻ ions, and the concentration of C₃H₇NH₂ to be 0.1 - 7.24 x 10⁻³ M.

4. Solve for Kb:
Kb = (7.24 x 10⁻³ x 7.24 x 10⁻³)/(0.1 - 7.24 x 10⁻³) = 5.24 x 10⁻⁵

5. Determine the pKb value:
pKb = -log(Kb) = -log(5.24 x 10⁻⁵) = 4.28

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Answer:

Mass = 26.8 g

Explanation:

Given data:

Mass of sodium hydroxide are required = ?

Mass of water = 232 g

Molarity of solution = 2.88 M

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

1 g = 0.001 L

232 g = 0.001 L× 232 =0.232 L

By putting values in molarity formula,

2.88 M = number of moles / 0.232 L

Number of moles = 2.88 M ×0.232 L

Number of moles = 0.67 mol

Mass of NaOH:

Mass = number of moles × molar mass

Mass = 0.67 mol × 40 g/mol

Mass = 26.8 g

Answer:

Normal boiling point is the temperature at which a liquid boils at 1 atmosphere of pressure.

Explanation:

The difference in temperature from standard that will cause an error of 1 part in 1×10⁴ when using a steel tape is approximately 0.005 degrees Celsius.

Steel tapes, like any measuring instrument, are affected by changes in temperature. When a steel tape is subjected to temperature variations, it expands or contracts, resulting in changes in its length. This thermal expansion or contraction can introduce errors in measurements if not properly accounted for.

To determine the temperature difference that will cause an error of 1 part in 1×10⁴, we need to consider the coefficient of linear expansion of the steel tape material. The coefficient of linear expansion represents the change in length per unit length per degree Celsius of temperature change.

Let's assume that the steel tape has a coefficient of linear expansion of α. To find the temperature difference, we can use the formula:

ΔT = (1 part in 1×10⁴) / (α × L)

Here, L represents the length of the steel tape.

Since the question mentions that both 46.99 and 47.0 are incorrect, we can conclude that the temperature difference causing the error is between these two values. This implies that the actual temperature difference is closer to 0.005 degrees Celsius.

By calculating the temperature difference using the given formula and the known coefficient of linear expansion for the specific steel tape being used, we can determine the exact value.

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Answer:

Continental polar

Explanation:

Answer:

Polar air masses!

Explanation:

They form between 50 and 60 degrees latitiude, Siberia and Northern Canada are the most commonplace for these to form!

Answer:

4. The question needs to focus more on a relationship instead of just numbers.

Explanation:

One of the characteristic of a good research questions that the answer to that question should be able to be used to make a certain decision. Without this, the question would be considered as useless.

The answer to the question "How many alligators live in the Everglades National Park?"  will not provide you with any useful information. Only non-useful fact. We need to make a little adjustment to make the answer becomes useful.

For example,  Let's say that we alter the question to;

"How littering contribute to the number of Alligators that live in the Everglades National Park?'

The answer to that question will provide us with something that we can use to make a decision. Let's say we find out that littering lead to decreasing number of alligators. We can use this data to convince the legislators to increase the budget to clean up the national park.

Explanation:

What is the best method for separating food dyes

in stoichiometric proportions, 3.1875 moles of oxygen are needed to react with 2.55 moles of ammonia.

The balanced chemical equation for the reaction between ammonia (NH₃) and oxygen (O₂) to form nitrogen monoxide (NO) and water (H₂O) is:

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

From the balanced equation, we can see that 4 moles of ammonia react with 5 moles of oxygen.

Given that 2.55 moles of ammonia are reacting, we can use this ratio to calculate the number of moles of oxygen required:

(2.55 moles NH₃) × (5 moles O₂ / 4 moles NH₃) = 3.1875 moles O₂

Therefore, in stoichiometric proportions, 3.1875 moles of oxygen are needed to react with 2.55 moles of ammonia.

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The osmotic concentration of a 10.0 mM MgCl2 solution is approximately 20.0 osmol/L.

Osmotic concentration refers to the concentration of osmotically active particles in a solution, which determines its osmotic pressure. To calculate the osmotic concentration of a solution, we need to consider the number of particles that contribute to the osmotic pressure.

In the case of MgCl2, it dissociates in water to produce three particles: one Mg2+ ion and two Cl- ions. Therefore, each mole of MgCl2 produces three osmotically active particles.

Given that the solution has a concentration of 10.0 mM (millimoles per liter) MgCl2, we can convert it to moles by dividing by 1000. So, 10.0 mM is equal to 0.010 moles per liter.

Since each mole of MgCl2 produces three osmotically active particles, we multiply the concentration by three to obtain the osmotic concentration. Therefore, the osmotic concentration of the 10.0 mM MgCl2 solution is approximately 0.010 moles/L × 3 = 0.030 osmol/L.

Finally, to convert osmol/L to milliosmoles per liter (mosmol/L), we multiply by 1000. Thus, the osmotic concentration of the 10.0 mM MgCl2 solution is approximately 0.030 osmol/L × 1000 = 30.0 mmol/L.

Therefore, the osmotic concentration of the 10.0 mM MgCl2 solution is approximately 30.0 mosmol/L, or simply 20.0 osmol/L (since osmol/L and mosmol/L represent the same unit of osmotic concentration).

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A molecule of ethanol (C2H6O) is composed of 9 atoms.

Breaking down the molecular formula: C2H6O

There are 2 carbon atoms (C2).

There are 6 hydrogen atoms (H6).

There is 1 oxygen atom (O).

In total, the molecule of ethanol contains 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom, summing up to a total of 9 atoms.

A molecule of ethanol (C2H6O) consists of 2 carbon atoms (C), 6 hydrogen atoms (H), and 1 oxygen atom (O). Therefore, there are a total of 2 + 6 + 1 = 9 atoms in a molecule of ethanol.

Adding up the individual atoms, we get a total of 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom, which sum up to 9 atoms in total.

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The molarity of 4 grams of KNO3 in 3.8 L of solution is approximately c) 0.01 M.

To calculate the molarity (M) of a solution, you need to divide the moles of solute by the volume of the solution in liters.

Given:

Mass of KNO3 = 4 grams

Volume of solution = 3.8 L

First, we need to determine the number of moles of KNO3 using its molar mass. The molar mass of KNO3 can be calculated as follows:

Molar mass of KNO3 = (atomic mass of K) + (atomic mass of N) + (3 x atomic mass of O)

Using the atomic masses from the periodic table:

Atomic mass of K = 39.10 g/mol

Atomic mass of N = 14.01 g/mol

Atomic mass of O = 16.00 g/mol

Molar mass of KNO3 = (39.10 g/mol) + (14.01 g/mol) + (3 x 16.00 g/mol)

Next, calculate the moles of KNO3 using the given mass:

Moles of KNO3 = Mass of KNO3 / Molar mass of KNO3

Now, divide the moles of KNO3 by the volume of the solution in liters to obtain the molarity:

Molarity (M) = Moles of KNO3 / Volume of solution (in liters)

Perform the calculations using the given values and constants to determine the molarity of the solution.

Now, let's calculate the molarity:

Molar mass of KNO3 = (39.10 g/mol) + (14.01 g/mol) + (3 x 16.00 g/mol) = 101.10 g/mol

Moles of KNO3 = 4 g / 101.10 g/mol

Molarity (M) = (4 g / 101.10 g/mol) / 3.8 L

Molarity (M) = 0.0105 M

Comparing the calculated molarity to the given answer choices:

a. 1.05 M (This is 10 times greater than the calculated value)

b. 1.08 M (This is 100 times greater than the calculated value)

c. 0.01 M (This matches the calculated value)

d. 0.02 M (This is twice the calculated value)

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The average atomic mass of chlorine in amu when chlorine occurs as a mixture of two stable isotopes with the following natural abundances: chlorine-35 (76%) and chlorine-37 (24%) is 35.48

The chlorine element is present in two isotopes namely 35Cl and 37Cl. The average atomic mass of chlorine is as follows;

       A.M=35×76+24×37/100=35.48

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Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

Since methane (CH4 C H 4) lacks an N-H, O-H, or F-H bond, it cannot form hydrogen bonds. Because the N, O, and F atoms are tiny and extremely electronegative, hydrogen bonding is only possible in molecules with those bonds.

A hydrogen atom that is bound to an electronegative and another electronegative atom atom that is close proximity interact with each other to form hydrogen, which are a special a kind attractive intermolecular forces. This process is known as hydroxyl group. Hydrogen, for example, is covalently linked to the more highly electronegative atom in water molecules (H2O).

Therefore, the charged particle interactions between both the hydrogen ion of one molecule of water and the oxygen molecule of another H2O molecule are just what cause hydrogen bonding to occur in water molecules.

What Prerequisites Must Be Met for Hydrogen Bonding?

Whenever a hydrogen atom is joined to an extremely electronegative atom in a molecule, it attracts .

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In one mole of sodium carbonate, there are 2 moles of sodium , 6 moles of oxygen and 1 mole of C. Hence, in 1.25 moles of the compound, 2.5 moles of Na, 7.5 moles of O and 1.25 moles of C.

The molar mass of a compound  is the mass of one mole of the compound. One mole of any compound contains 6.02 × 10²³ atoms. This number is called Avogadro number.

2.  Convert 2.50 mol of Na2CO3 to mass in g.

Molar mass of sodium carbonate  = 106 g/mol

then, mass of 2.50 mol = 265 g.

3. Convert 5.50 g of Na2CO3 to mol.

Number of moles in 5.50 g of sodium carbonate = 5.50 g/ 106 = 0.051 moles.

4.Covert 5.50 g of Na2CO3 to number of particles

Now, one mole of sodium carbonate contains Avogadro number of atoms or molecules . Then number of particles in 5.50 g that is 0.051 moles is:

0.051 × 6.022 × 10²³ = 3.072 × 10²² particles.

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Explanation:

the pressure and temperature of the air increase

reason:

the volume of the space containing air decreases.

Explanation:

Whether you know it or not, compressed air is involved in every aspect of our lives, from the balloons at your birthday party to the air in the tires of our cars and bicycles. It was probably even used when making the phone, tablet or computer you’re viewing this on.

The main ingredient of compressed air is - you guessed it! - air. Air is a gas mixture, which means it consists of many different gases. Primarily these are nitrogen (78%) and oxygen (21%).

The temperature of the air is directly proportional to the mean kinetic energy of these molecules. This means that the air temperature will be high if the mean kinetic energy is large (and the air molecules move faster). The temperature will be low when the kinetic energy is small.

Compressing the air makes the molecules move more rapidly, which increases the temperature. This phenomenon is called “heat of compression”. Compressing air is literally to force it into a smaller space and as a result bringing the molecules closer to each other. The energy that gets released when doing this is equal to the energy required to force the air into the smaller space. In other words, it stores the energy for future use.

Answer:

None of the above

Explanation:

Erikson's was a student of freud's and expanded of his theory of psychosexual development by emphasizing the importance of culture in parenting practices and motivations and adding three stages of adult development.

The soda water didn't freeze because of the depression in freezing point as compared to the water.

When a solute is added to a pure solvent , then the value of freezing point is reduced.

The decrease in the freezing point is directly proportional to the molality of the solute.

It is given in the question that

A student put a bottle of water and a can of sugared soda in the freezer to chill them quickly.

when she took them out, the bottle of water was frozen but the can of soda was not.

It is because water is the pure solvent , so freezing point is fixed but the soda water has sugar and Carbon Di oxide along with the solvent water , the presence of the sugar and Carbon -di-oxide decreases the freezing point of the soda water and so it doesn't freezes.

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Answer:

C - raising the temperature of a gas

Explanation:

as you raise temperature, kinetic energy rises, and so does pressure

Answer:

C.

raising the temperature of the gas

Explanation:

Edg. 2020

Other guy is right i got 100%

The bottoms of waste dumps should be lined with impermeable materials like clay or synthetic liners to protect aquifers from pollution.


Waste dumps can contain hazardous materials that can seep into the soil and contaminate groundwater, including aquifers, which are important sources of drinking water. Lining the bottoms of waste dumps with impermeable materials helps prevent these contaminants from leaching into the groundwater. Impermeable liners can include clay, plastic, or synthetic materials, and they are designed to create a barrier that prevents the movement of water and pollutants.

Lining the bottoms of waste dumps with impermeable materials is an important measure to protect the quality of groundwater and aquifers. It is important to properly design and maintain these liners to prevent leaks and ensure their effectiveness in preventing pollution.


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