to how much water should 200. mL of 18 M sulfuric acid be added to prepare a 3.5 M solution

Answer: Yes

Explanation:

Answer:

trueeeeee

Explanation:

To solve this problem, we could use the Boyle's law since there's a sample of ideal gas and temperature is constant.

Boyle's law tells us that:

Replacing the values of the problem:

The new volume V equals 5.6L.

Osmosis is of two types:

Endosmosis– When a substance is placed in a hypotonic solution, the solvent molecules move inside the cell and the cell becomes turgid or undergoes deplasmolysis. This is known as endosmosis.

Exosmosis– When a substance is placed in a hypertonic solution, the solvent molecules move outside the cell and the cell becomes flaccid or undergoes plasmolysis. This is known as exosmosis.

There are some variations or types of osmosis on the basis of the direction of the movement of solvent molecules.

The percentage yield of H₂SO₄ given that 100 g of SO₂ was completely consumed is 65.3%

To calculate the percentage yield of H₂SO₄, we must first obtain the theoretical yield. This can be obataned as follow:

2SO₂ + O₂ + 2H₂O → 2H₂SO₄

Molar mass of SO₂ = 32 + (16 × 2) = 64 g/mol

Mass of SO₂ from the balanced equation = 2 × 64 = 128 g

Molar mass of H₂SO₄ = (1 × 2) + 32 + (16 × 4) = 98 g/mol

Mass of H₂SO₄ from the balanced equation = 2 × 98 = 196 g

From the balanced equation above,

128 g of SO₂ reacted to produce 196 g of H₂SO₄

Therefore,

100 g of SO₂ will react to produce = (100 × 196) / 128 = 153.125 g of H₂SO₄

Finally, we shall determine the percentage yield of H₂SO₄. This shown below:

Percentage yield = (Actual /Theoretical) × 100

Percentage yield of H₂SO₄ = (100 / 153.125) × 100

Percentage yield of H₂SO₄ = 65.3%

Thus, the percentage yield is 65.3%

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The new volume of the gas in the syringe, after heating a 50 mL sample from 15°C to 50°C under constant atmospheric pressure, is approximately 0.056 L.

To calculate the new volume of the hot gas, we can use the ideal gas law equation:

\(PV = nRT\)

where P is the pressure,V is the volume,n is the number of moles,R is the ideal gas constant (8.314 J/(mol·K)),

and T is the temperature in Kelvin.

Given that the initial volume (V1) is 50 mL, which is equivalent to 0.050 L, and the initial temperature (T1) is 15°C, which is equivalent to 15 + 273.15 = 288.15 K.

We can assume that the pressure and the number of moles remain constant throughout the process.

To find the new volume (V2) at the final temperature (T2), we can rearrange the ideal gas law equation:

\(V2 = (P * V1 * T2) / (P * T1)\)

Since the pressure is constant and cancels out, the equation simplifies to:

\(V2 = (V1 * T2) / T1\)

Substituting the given values:

\(V2 = (0.050 L * 323.15 K) / 288.15 K\\V2 = 0.056 L\)

Therefore, the new volume of the hot gas after heating the 50 mL sample from 15°C to 50°C is approximately 0.056 L.

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Based on the lab values provided, the answer would be D. The patient has been immunized against hepatitis B as indicated by the presence of HBsAB.

The absence of HBsAg and HBcAb suggest that the patient has not had a recent or current infection with hepatitis B. It is important to note that these lab values should be interpreted by a health care provider in the context of the patient's medical history and any additional lab or clinical findings.

HBcAb (-) means the patient does not have antibodies for the hepatitis B core antigen, suggesting no past infection. These results suggest that the patient has been immunized against hepatitis B.

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Interpreting these lab values for a 40-year-old patient with the given terms:

HBsAg (-), HBsAB(+), HBcAb(-)

a. the pt had hepatitis
b. the pt has hepatitis
c. the pt should consider immunization
d. the pt has been immunized

Your answer: d. the pt has been immunized.

HBsAg (Hepatitis B surface antigen) is negative, which indicates the patient does not have an active Hepatitis B infection.
HBsAB (Hepatitis B surface antibody) is positive, which suggests that the patient has developed immunity to Hepatitis B, either from previous exposure or immunization.
HBcAb (Hepatitis B core antibody) is negative, which means the patient has never been exposed to Hepatitis B.

Therefore, the interpretation of these lab values suggests that the patient has been immunized against Hepatitis B.

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There are approximately 1.387 moles in 25 grams of water (1) and 134.46 grams in 4.5 moles of Li₂O (2).

1. To calculate the number of moles, we need to divide the given mass of water by the molar mass of water, which is approximately 18.015 g/mol.

Number of moles = 25 grams / 18.015 g/mol

≈ 1.387 moles

Therefore, there are approximately 1.387 moles in 25 grams of water.

2. To calculate the mass in grams, we need to multiply the number of moles by the molar mass of Li₂O, which is approximately 29.88 g/mol.

Mass in grams = 4.5 moles x 29.88 g/mol

≈ 134.46 grams

Therefore, there are approximately 134.46 grams in 4.5 moles of Li₂O.

3. To determine the number of molecules in 23 moles of oxygen, we can use Avogadro's number, which states that there are 6.022 x 10²³ molecules in one mole of any substance. Therefore, for 23 moles of oxygen, we can calculate:

Number of molecules = 23 moles x 6.022 x 10²³ molecules/mole

= 1.38646 x 10²⁵ molecules

So, there are approximately 1.38646 x 10²⁵ molecules in 23 moles of oxygen.

4. To determine the number of moles in 3.4 x 10²³ molecules of H₂SO₄, we can use Avogadro's number. Since one mole contains 6.022 x 10²³ molecules, we can calculate:

Number of moles = (3.4 x 10²³ molecules) / (6.022 x 10²³ molecules/mole)

= 0.564 moles

So, there are approximately 0.564 moles in 3.4 x 10²³ molecules of H₂SO₄.

5. To determine the number of molecules in 25 grams of NH₃, we need to convert grams to moles using the molar mass of NH₃. The molar mass of NH₃ is 17.03 g/mol.

Number of moles = 25 grams / 17.03 g/mol

≈ 1.468 moles

Using Avogadro's number, we can calculate the number of molecules:

Number of molecules = (1.468 moles) x (6.022 x 10²³ molecules/mole)

= 8.831 x 10²³ molecules

So, there are approximately 8.831 x 10²³ molecules in 25 grams of NH₃.

The complete question is:

Answer the following questions:

1) How many moles are in 25 grams of water?

2) How many grams are in 4.5 moles of Li₂O?

3) How many molecules are in 23 moles of oxygen?

4) How many moles are in 3.4 x 10²³ molecules of H₂SO₄?

5) How many molecules are in 25 grams of NH₃ ?

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Answer:

mild

Explanation:

explanation

the chemical formula of water is H²O.

Hydrogen+Oxygen=water

answer

Hydrogen-Water-Hydrogen

Answer: The atomic symbol represent an isotope that undergoes radioactive decay to produce Pb-206 can be, Polonium (Po).

Answer:

This is because of the lone pairs present in the molecules. Bond and lone pairs of electrons have maximum mutual repulsion but lone pairs of electrons have a stronger mutual repulsion than bond pairs thus creating a bent or v shape in water and trigonal pyramidal shape in ammonia.

There are 4 pairs of electrons in water. if all were bond pairs then the bond angle would be 109.5 but because of the the two lone pairs you take away 2.5 per lone pair from 109.5. Same goes to ammonia if they were all bond pairs then it would be 109.5 but because of the one lone pair it becomes 107.

Explanation:

The metal that has the highest melting point is Mo while the metal that has the lowest melting point if Fr.

Metals are those elements found towards the left hand side of the periodic table. They are able to loose electrons easily and they have a high , melting and boiling point.

The metal that has the highest melting point is Mo while the metal that has the lowest melting point if Fr. This is clear from the chart of melting points in the image attached to the question.

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Balanced Chemical Equation is defined as the equation in which the number of atoms on the reactants side and number of atoms on the product side is equal.

Thus, the balanced equation of the sulfur and oxygen will be

\(\rm S_8 + O_2 \rightarrow 8 SO_2\).

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Answer:

It is D

Explanation

In philosophy there is a lot of emphasis on what exists. We call this ontology, which means, the study of being. What is less often examined is what does not exist.

It is understandable that we focus on what exists, as its effects are perhaps more visible. However, gaps or non-existence can also quite clearly have an impact on us in a number of ways. After all, death, often dreaded and feared, is merely the lack of existence in this world (unless you believe in ghosts). We are affected also by living people who are not there, objects that are not in our lives, and knowledge we never grasp.

Upon further contemplation, this seems quite odd and raises many questions. How can things that do not exist have such bearing upon our lives? Does nothing have a type of existence all of its own? And how do we start our inquiry into things we can’t interact with directly because they’re not there? When one opens a box, and exclaims “There is nothing inside it!”, is that different from a real emptiness or nothingness? Why is nothingness such a hard concept for philosophy to conceptualize?

Let us delve into our proposed box, and think inside it a little. When someone opens an empty box, they do not literally find it devoid of any sort of being at all, since there is still air, light, and possibly dust present. So the box is not truly empty. Rather, the word ‘empty’ here is used in conjunction with a prior assumption. Boxes were meant to hold things, not to just exist on their own. Inside they might have a present; an old family relic; a pizza; or maybe even another box. Since boxes have this purpose of containing things ascribed to them, there is always an expectation there will be something in a box. Therefore, this situation of nothingness arises from our expectations, or from our being accustomed. The same is true of statements such as “There is no one on this chair.” But if someone said, “There is no one on this blender”, they might get some odd looks. This is because a chair is understood as something that holds people, whereas a blender most likely not.

The same effect of expectation and corresponding absence arises with death. We do not often mourn people we only might have met; but we do mourn those we have known. This pain stems from expecting a presence and having none. Even people who have not experienced the presence of someone themselves can still feel their absence due to an expectation being confounded. Children who lose one or both of their parents early in life often feel that lack of being through the influence of the culturally usual idea of a family. Just as we have cultural notions about the box or chair, there is a standard idea of a nuclear family, containing two parents, and an absence can be noted even by those who have never known their parents.

This first type of nothingness I call ‘perceptive nothingness’. This nothingness is a negation of expectation: expecting something and being denied that expectation by reality. It is constructed by the individual human mind, frequently through comparison with a socially constructed concept.

Pure nothingness, on the other hand, does not contain anything at all: no air, no light, no dust. We cannot experience it with our senses, but we can conceive it with the mind. Possibly, this sort of absolute nothing might have existed before our universe sprang into being. Or can something not arise from nothing? In which case, pure nothing can never have existed.

As previously mentioned, electrons in atoms can only exist on specific energy levels and not in between them. The energy of an electron in an atom is said to be quantized, meaning that it can only equal a restricted range of values and can jump from one energy level to another with no smooth transition in between.

The finest knowledge of these subjects is provided through the use of quantum theory. Chemical bonding is preceded by this understanding. As previously mentioned, electrons in atoms can only exist on specific energy levels and not in between them.

Arnold Sommerfeld put forth the quantum free electron theory. His research explains how the high number of electrons disturbs the energy levels through the behavior of free electrons in various potential energy states. Free electron energies are quantized.

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Answer:

Mountains

Explanation:

Mountains are colder than the lower elevations.  When humid air enters a cooler region, the saturated air begins to cool  and this reduces the ability of the air to maintain the evaporated water is the gas state.  Molecules of water have reduced enerfy at the cooler temperatures.  They will slow down and coalesce with other water molecules to form small droplets of water.  The atmoshere cannot hold these heaevier droplets and they begin to fall  (i.e., rain).

One migh ask why does the air temperature drop at higher altitudes?  Heat rises, so why shouldn't it be warmer on top a mountain, compared to the valley.  The reason is that the atmosphere becomes less dense the further from Earth's center on gets.  This less dense air has a lower water saturation point, so it rains.

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Take the percentages divide them by the atomic relative mass of the atoms. After dividing you will get the values. Divide all the values with the smallest value which you get and by doing this you will get a ratio and this will be the empirical formula.

The smallest value in a list of numbers is referred to as the minimum (the greatest value is called the maximum).

The lowest point on a vertex is the minimal value of a function. Your quadratic equation will have a minimal value if it contains a positive term.

By graphing the function or by applying one of the two equations, you can determine this minimum value.

The lowest point on a vertex is the minimal value of a function. Your quadratic equation will have a minimal value if it contains a positive term.

By graphing the function or by using one of the two equations, you can determine this minimum value.

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Answer:

wat dose dis du

Explanation:

u to frend lit me now if yu need help with yur math and english homewirk. me got anser 2 evryting

Answer: (2S,3S)-2-Bromo-3-phenylbutane will undergo E2 reaction and form trans product of elimination due to its thermodynamic stability

Explanation:

Answer:

a closed series circuit

Answer:

An open series circuit

Explanation:

I'm late but for future people...

I took the test.

Answer:

because of atom don't put that as an answer

Explanation:

i need point to do finals

The different behavior of particles in solids and gases, including the intermolecular forces and kinetic energy, leads to solids filling only part of a closed jar while the same mass of a gas fills the whole jar. A solid fills only part of a closed jar, while the same mass of a gas fills the whole jar due to the differences in the behavior of particles in each state of matter.

1. Solid: In a solid, the particles are tightly packed and held in a fixed position. They have a definite shape and volume. The intermolecular forces between the particles are strong, preventing them from moving freely. As a result, solids occupy a specific amount of space within a container.

2. Gas: In a gas, the particles are spread out and move freely. They have no definite shape or volume. The intermolecular forces between the particles are weak, allowing them to move and fill the available space. As a result, gases can expand to fill the entire volume of a container.

When the same mass of a gas and a solid are placed in a closed jar, the gas particles have higher kinetic energy and are more mobile. They collide with each other and the walls of the container, exerting pressure and spreading out to occupy the entire space. Since the intermolecular forces are weak, the gas particles are not constrained by a fixed arrangement.

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Answer:

D

Explanation:

The correct answer for the question "What is a simple list in Lisp?" is "A list where every member is an atom," not "A list that is terminated by nil."

In Lisp, a simple list is defined as a list where every member is an atom. An atom in Lisp refers to a basic data element that is indivisible, such as a number, a symbol, or a string. In a simple list, each element within the list must be an atom, and there cannot be any nested lists or sublists. For example, (1 2 3) and ("apple" "banana" "orange") are both examples of simple lists because each member is an atom.

On the other hand, the statement "A list that is terminated by nil" is not a correct definition of a simple list. In Lisp, lists are typically represented as linked lists, where each element points to the next element in the list until it reaches the end. In this representation, the end of the list is denoted by the symbol nil.

However, a simple list is not defined by the termination by nil; it is defined by having every member as an atom.

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Answer:

There are three methods used to produce salt: solar, evaporation and rock mining.

Explanation:

Answer:  1 cm = 100m

Explanation:  Centi- is the prefix used to designate 0.01 (one hundredth) of something.  1 cm means 0.01 m.

1 cm = 100 m  is NOT a correct conversion factor. Option C is correct.

The conversion factors are the factors that re-use to convert some values from unit to unit of another value like from centimeter to meter from meter to kilometer from milligram to gram.

In one centimeter it is the suffix used to denote it is the one by hundred value of the on meter or which is equal t one meter so, 1cm = 0.01 meters as it is the 1/100 part f the one-meter distance.

Therefore, Option C is correct. 1 cm = 100 m  is NOT a correct conversion factor.

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If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.

The weight of an object is the product of the mass and the acceleration due to gravity. The acceleration due to gravity of an object is the impact owing to the fact that the object lies within the earth's gravitational field.

If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.

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The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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Answer :Yet Hooke was perhaps the single greatest experimental scientist of the  describing elasticity that is still used today ("Hooke's Law"); assisted Robert Boyle the history of biology largely rests on his book Micrographia, published in 1665.  than his compound microscope, but found simple microscopes difficult to use: he

Explanation: think you