Why does a straw look broken when it is placed in a water glass?

There are approximately 0.000486 moles of hydrogen present in the sample.

To find the number of moles of hydrogen present in the sample, you need to use the ideal gas law equation, which is PV = nRT where P is the pressure of the gas (in atm), V is the volume of the gas (in L), n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas (in K). First, you need to convert the pressure from torr to atm. You can do this by dividing the pressure in torr by 760, since 1 atm is equal to 760 torr. In this case, the pressure in atm would be: P = 764.5 torr / 760 = 1.0059 atm Next, you need to convert the volume from ml to L. You can do this by dividing the volume in ml by 1000, since 1 L is equal to 1000 ml. In this case, the volume in L would be: V = 30.42 ml / 1000 = 0.03042 L Finally, you need to convert the temperature from degrees Celsius to Kelvin. You can do this by adding 273.15 to the temperature in Celsius. In this case, the temperature in K would be:T = 25.58 degrees Celsius + 273.15 = 298.73 K Now that you have all the necessary values, you can plug them into the ideal gas law equation to solve for the number of moles of hydrogen: n = (PV) / (RT) = (1.0059 atm * 0.03042 L) / (8.31 J/mol*K * 298.73 K) = 4.86 x 10^-4 mol Therefore, there are approximately 0.000486 moles of hydrogen present in the sample

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the answer to you question is -2

The pH of the buffer solution is approximately 3.67.

To calculate the pH of the buffer solution, we need to first calculate the concentrations of the acid and its conjugate base after mixing the solutions.

The balanced chemical equation for the dissociation of lactic acid is:

CH3CH(OH)COOH  +  H2O  <-->  CH3CH(OH)COO-  +  H3O+

The acid dissociation constant (Ka) for lactic acid is 1.38 x 10^-4 at 25°C.

Using the Henderson-Hasselbalch equation, we can calculate the pH of the buffer solution:

pH = pKa + log([A-]/[HA])

where [A-] is the concentration of the conjugate base (sodium lactate) and [HA] is the concentration of the acid (lactic acid).

Step 1: Calculate the moles of lactic acid and sodium lactate

Moles of lactic acid = 0.13 mol/L x 0.085 L = 0.01105 mol

Moles of sodium lactate = 0.08 mol/L x 0.095 L = 0.0076 mol

Step 2: Calculate the total volume of the buffer

Total volume = 85 mL + 95 mL = 0.085 L + 0.095 L = 0.18 L

Step 3: Calculate the concentrations of lactic acid and sodium lactate

[HA] = moles of lactic acid / total volume = 0.01105 mol / 0.18 L = 0.0614 M

[A-] = moles of sodium lactate / total volume = 0.0076 mol / 0.18 L = 0.0422 M

Step 4: Calculate the pH of the buffer solution

pKa of lactic acid = -log(Ka) = -log(1.38 x 10^-4) = 3.86

pH = pKa + log([A-]/[HA])

= 3.86 + log(0.0422/0.0614)

= 3.86 - 0.19

= 3.67

Therefore,  by calculating we can say that the pH of the buffer solution is approximately 3.67.

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Answer:

P and Q

Q and R

Explanation:

To begin, we must bear in mind the meaning of isotope.

Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number present in the atoms involved.

Thus, we shall write out the number of protons, neutrons and electrons present in the model given above. This is given:

Model P:

Proton = 12

Neutron = 13

Electron = 13

Model Q:

Proton = 12

Neutron = 12

Electron = 13

Model R:

Proton = 12

Neutron = 13

Electron = 12

From the above data, we can say that:

1. P and Q are isotope since they have different Neutron number.

2. P and R are not isotope since they have the same Neutron number.

3. Q and R are isotope since they have different Neutron number.

Answer:

Flexible containers have the flexibility to alter their size or shape upon changing pressure or temperature, however rigid containers do not have that flexibility therefore that makes them different from each other

Explanation:

Hope this helps:)...if not sorry for wasting your time and may God bless you:)

3-sulfolene is more stable and simpler to synthesis than 1,3-butadiene, which makes it easier to handle and store.

Both the conjugated dienes 1,3-butadiene and 3-sulfolene are capable of undergoing Diels-Alder reactions. Yet, there are a number of reasons why 3-sulfolene was chosen for this reaction rather than 1,3-butadiene. There are a number of reasons why 3-sulfolene was chosen for this reaction rather than 1,3-butadiene. First off, 3-sulfolene is more stable and simpler to synthesis than 1,3-butadiene, which makes it easier to handle and store. Second, employing 3-sulfolene increases the Diels-Alder reaction's regioselectivity, making it more effective at producing the desired product. In addition, 3-sulfolene is a superior diene for the reaction with the electron-deficient dienophile because it has a larger electron density and is more nucleophilic than 1,3-butadiene. Lastly, unlike 1,3-butadiene, 3-sulfolene includes a sulfone group that may be easily removed under moderate circumstances to produce the desired product.

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From the stoichiometry of the reaction, carbon is in excess and 5.856 g s left over.

The reaction can be written as; 4C(s) + 5H2(g) -----> C4H10(g)

Number of moles of C =  13.45 g/1 2g/mol = 1.12 moles

If 1 mole of hydrogen occupies 22.4 L

x moles of hydrogen occupies  17.65 L

x = 0.79 moles

Now;

4 moles of carbon reacts with 5 moles of hydrogen

1.12 moles of carbon reacts with  1.12 moles * 5 moles/4 moles

= 1.4 moles of hydrogen

Hence hydrogen is the limiting reactant here and carbon is in excess.

If 4 moles of carbon reacts with 5 moles of hydrogen

x moles of carbon reacts with 0.79 moles of hydrogen

x = 0.632 moles

Number of moles of carbon unreacted =  1.12 moles -  0.632 moles

= 0.488 moles

Mass of carbon unreacted = 0.488 moles * 12 g/mol

= 5.856 g

Volume of butane produced is obtained from;

5 moles of hydrogen produces 1 mole of butane

0.79 moles of hydrogen produces 0.79 moles *  1 mole/ 5 moles

= 0.158 moles

1 mole of butane occupies 22.4 L

0.158 moles of butane occupies 0.158 moles * 22.4 L/ 1 mole

= 3.53 L

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Answer:

[2]HBr + [ ] Ba(OH)2 ➖ [ ] BaBr2 + [2] H20

Hope it will help :)

The number of electrons in a system of cyclic conjugation can be determined based on the concept of the Huckel rule.

In a cyclic conjugated system, the number of π electrons can be calculated using the formula 4n + 2, where 'n' is the number of conjugated π molecular orbitals. This formula is derived from the Huckel rule, which states that cyclic conjugated systems with 4n + 2 π electrons are aromatic and exhibit enhanced stability.

If a system does not satisfy the Huckel rule (i.e., the number of π electrons is not in the form of 4n + 2), then the system does not exhibit cyclic conjugation, and the number of electrons in the system is zero.

To determine the number of electrons in a specific cyclic conjugated system, the structure of the molecule needs to be known, and the number of delocalized π electrons can be counted based on the number of conjugated bonds or π molecular orbitals present in the cycle.

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Answer:

yes

Explanation:

The warm air in Earth’s atmosphere and the warm water in Earth’s oceans sink instead of rise.

The heat energy can be transported by convection by the temperature differential between the two portions of the fluid. Hot fluids tend to ascend due to the temperature differential, but cold fluids prefer to sink. This causes a convection current to form inside the fluid.

Differential heating causes convection currents. Warmer (less dense) stuff rises, whereas cooler (more dense) material sinks. This movement is responsible for the formation of circulation patterns known as convection currents in the Earth’s atmosphere, ocean, and mantle.

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In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals

Neutralization reaction is the reaction that occur between acid and base.

Neutralization reaction is the reaction that take place between acid and base to produce salt and water. For examples HCl react with NaOH to produce NaCl and H2O

Therefore, Neutralization reaction is the reaction between acid and base.

The question is not complete but the option are gotten from another website.

Here are the options.

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Answer:3 oxygen atoms.

Explanation: Each formula unit of Fe2O3 contains 2 atoms of iron and 3 atoms of oxygen (technically they are ions, but that doesn't matter).

Answer:

Mass =116.16 g

Explanation:

Given data:

Moles of CF₄ = 1.32 mol

Mass of  CF₄ = ?

Solution:

Molar mass of  CF₄= 88 g/mol

Formula:

Number of moles = mass/ molar mass

Number of moles × molar mass = Mass

Mass = 1.32 mol ×  88 g/mol

Mass =116.16 g

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."--

Chromosomes contain many genes, and genes are instructions for producing proteins.

Chromosomes are thread-like objects that are found in the nucleus (core) of cells. One chromosome is made up of one protein and one DNA molecule. Different chromosome sizes can be packed together into a nucleus thanks to proteins called histones. Our chromosomes would be as tall as ours without them. The exact instructions needed by your cells to create a distinct you are provided by your chromosomes.

There should be 23 pairs of chromosomes in humans (46 total). Chromosomes are divided into one pair of sex chromosomes and 22 numbered pairs (autosomes) (X and Y). You receive a pair of chromosomes, one from each parent. The building blocks of your body are your genes. The instructions to produce proteins are provided by some genes. Your body receives instructions from proteins about the kinds of physical traits you ought to have, such as your hair and eye colour. Some genes produce RNA that performs additional functions.

Hence, genetic information is translated into protein based on need.

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Answer:

39.5L

Explanation:

Dates are collected carefully and with a lot of laborious work, much as how they are cultivated. After adding water and filtering the homogenized result with a cellulose filter aid, date fruits are removed using a wet grinding process.

The polysaccharide cellulose, an organic molecule with the formula n, is made up of a linear chain of several hundred to many thousands of D-glucose units that are covalently bonded.

Plant cell walls include the carbohydrate cellulose. The structure of the carbohydrate is polysaccharide. A lengthy chain of many sugar units joined by chemical bonding makes up a polysaccharide. Examples of polysaccharides include starch, chitin, glycogen, cellulose, and glycogen.

Use of a reach lift varies greatly depending on the size of the trees. This lift carries an employee up the trees to gather the date bunches. The filtering aid might be date pits. Before filtering, a fermentation may be performed.

Thus, Dates are collected carefully and with a lot of laborious work, much as how they are cultivated.

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Therefore, the reaction free energy del G for the given reaction is approximately -204 kJ/mol.  

To calculate the reaction free energy del G for the given reaction, we can use the following equation:

del G = -RT ln Q

where R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (298.15 K = 25.0°C), ln is the natural logarithm, and Q is the reaction quotient.

The reaction quotient is defined as:

Q = [C] [A]/[B]

where [C], [A], and [B] are the concentrations of the reactants and products, respectively.

To find the reaction quotient, we can use the following equations:

[C] = 0.519 M

[A] = 2.18 M

[B] = 9.18 M

Therefore, the reaction quotient is:

Q = (0.519 M)(2.18 M)/(9.18 M) = 0.519 M

The reaction quotient is greater than 1, which means that the reaction is spontaneous. Therefore, the reaction is at equilibrium.

To find the reaction free energy del G, we can use the equation:

del G = -RT ln Q

Rearranging this equation, we get:

ln Q = ln [(1/R)(T/298.15)] - RT ln [C][A]/[B]

Taking the natural logarithm of both sides, we get:

ln Q = ln [(1/R)(T/298.15)] - RT ln 0.519

Substituting the values for R and T, we get:

ln Q = ln [(1/8.314)(298.15/298.15)] - (8.314 * 298.15) ln 0.519

ln Q = 0 - 203.66 J/mol

Taking the natural logarithm of both sides, we get:

ln Q = ln (0) - ln (203.66)

Substituting the value for ln (0), which is 0, we get:

ln Q = ln (203.66)

Taking the inverse natural logarithm of both sides, we get:

Q = e^(ln (203.66))

Q = 1.0021

Therefore, the reaction quotient is approximately 1.0021, which means that the reaction is at equilibrium.

To find the reaction free energy del G, we can use the equation:

del G = -RT ln Q

Substituting the value for Q, we get:

del G = -298.15 J/mol * 0.519 M / (9.18 M) * (298.15 K - 25.0 K)

Rearranging this equation, we get:

-RT ln Q = del G

Substituting the value for Q, we get:

-298.15 J/mol * 0.519 M / (9.18 M) * (298.15 K - 25.0 K) = -203.66 J/mol

Taking the natural logarithm of both sides, we get:

-RT ln Q = ln (203.66 J/mol)

Taking the inverse natural logarithm of both sides, we get:

Q = e^(-RT ln (203.66 J/mol))

Q = 1.0021

Therefore, the reaction free energy del G is approximately -203.66 J/mol.

Rounding the answer to the nearest kilojoule, we get:

del G ≈ -204 kJ/mol

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The final temperature of the air undergoing the polytropic process with n = 1.2 is 215.1 K. The specific heat capacity of air is a function of temperature, pressure, and volume in the process.

What is a polytropic process?

A polytropic process is a thermodynamic method that occurs when a system undergoes a change in pressure and volume and its internal energy is transformed through work. The term "polytropic" refers to a procedure in which pressure is modified but temperature is constant.

Polytropic processes can be described by the following formula:

P Vn = C (polytropic process formula)

The polytropic process's exponent "n" is frequently used to signify the nature of the compression. It can also indicate the procedure's efficiency. It is used to distinguish the nature of heat transfer from one substance to another in a closed system. Furthermore, the polytropic exponent is utilized to evaluate heat pumps, gas compressors and expanders, and combustion engines.

What is the formula for the final temperature of air?

The formula for calculating the final temperature of air undergoing a polytropic process with n = 1.2 is given byT2 = T1 * (p2/p1)^[(n-1)/n]

Here,

PA Initial temperature of the air, T1 = 400 °C

Final pressure of the air, p2 = 110 kPa = 0.11 MPa

Polytropic process exponent, n = 1.2

Using the above values in the formula,T2 = 400 + 273.15 * [(0.11/1)^[(1.2-1)/1.2]]T2 = 215.1 K

Therefore, the final temperature of the air undergoing the polytropic process with n = 1.2 is 215.1 K.

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Answer:

The answer is 101.1032

Explanation:

The more stable structure for the conjugate acid of guanidine is structure A.

Guanidine is a strong base and can act as a proton acceptor to form its conjugate acid. The conjugate acid of guanidine can exist in two different resonance structures, labeled A and B.

In structure A, the positive charge is located on the central nitrogen atom, which is a more stable configuration compared to structure B, where the positive charge is on one of the terminal nitrogen atoms.

This is because the central nitrogen atom is more electronegative than the terminal nitrogen atoms, which stabilizes the positive charge on it through resonance.

Additionally, in structure B, the positive charge is located on the nitrogen atom that is directly bonded to the carbon atom, which is less stable due to the inductive electron-withdrawing effect of the adjacent carbonyl group. Therefore, the more stable structure for the conjugate acid of guanidine is structure A.

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Answer:

friction

Explanation:

Answer:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

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(a) The natural sources of alkanoates includes fats and oils.

Alkanoates are organic compounds which are formed from the reaction which occurs between an alkanoic acid and alkanol.

So therefore, we can now confirm that one of the sources of esters are fatty oils.

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Answer:

11.03g/cm³

Explanation:

Given parameters:

Mass of the prism = 12358g

Height = 35cm

base side length = 4cm

second base side length = 8cm

Unknown:

Density of the rectangular prism = ?

Solution:

To find the density of the prism, we must find the volume first.

Density is the mass per unit volume of a substance;

   Density   = \(\frac{mass}{volume}\)

Volume of rectangular prism  = length x width x height

                                                 = 4 x 8 x 35

                                                 = 1120cm³

Insert the parameters;

  Density = \(\frac{12358}{1120}\)   = 11.03g/cm³

Answer:

2 Hydrogen atoms and 1 Oxygen atoms makes water

Explanation:

Hope this helps^^

Answer: Its chemical formula H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms,

Explanation: i hopes it helps :)

The answer is option 4. the histidine side-chain pKa value is lower because of favorable electrostatic interactions.

The histidine side-chain pKa value is lower in an environment surrounded by glutamates. This is because of favorable electrostatic interactions between the positively charged histidine and the negatively charged glutamate side chains.

In this scenario, the negatively charged glutamates stabilize the positively charged form of histidine, thereby making it easier for histidine to lose a proton and become charged. As a result, the pKa value, which is the measure of a molecule's acidity, decreases.

This outcome can be explained through the concept of electrostatics, where opposite charges attract and like charges repel each other. The presence of multiple negatively charged glutamate side chains surrounding histidine promotes the formation of favorable interactions between these oppositely charged groups. This leads to a lower energy state for the charged form of histidine, and thus, the pKa value decreases, reflecting the increased tendency for histidine to lose a proton and maintain a charged state in the presence of glutamates.

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