why is most of the mass of an atom in the nucleus

Answer:

Bonding;lone

Explanation:

As the reaction between the two gases proceeds, the volume of the container will decrease due to the formation of a new gas, XY, which takes up less space than the two gases combined.

In a closed system, the decrease in volume is accompanied by an increase in pressure, as the molecules of XY have less space to move around in than the molecules of X and Y.

This is because the increased pressure will cause the molecules to move faster, thereby increasing the kinetic energy of the system. This increase in temperature will cause the reaction to speed up, leading to more molecules of XY being formed. As the reaction continues, the pressure, temperature, and volume will continue to change in a dynamic equilibrium until all the reactants are used up.

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In a peptide bond, the carboxyl group (C=O) of one amino acid is linked to the amino group (N-H) of another amino acid. The backbone of the peptide consists of alternating nitrogen (N), alpha carbon (Cα), and carbonyl carbon (C) atoms. In the case of two peptide bonds, the arrangement would be Cα—N—C—C—N—Cα.

The correct answer is D) Cα-C-N-Cα-C-N. The backbone arrangement of two peptide bonds is represented by the repeating pattern of Cα-C-N, where the Cα (alpha carbon) is attached to the amino acid side chain, the N is the nitrogen atom of the peptide bond, and the C is the carbonyl carbon of the peptide bond. This pattern repeats throughout the entire protein chain to form the backbone of the protein. Option D correctly represents this pattern with two peptide bonds connected by Cα-C.
Hi! The backbone arrangement of two peptide bonds can be best represented by the following option:

B) Cα—N—C—C—N—Cα

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The correct options for 8, 9 and 10 are C, A and A respectively.

8. Nuclear reactions, including nuclear fusion and nuclear fission, both involve the conversion of mass into energy and the release of large amounts of energy.

9. The correct reaction is Be+,He-12C+1on.

The process of producing a nuclear reaction by colliding atomic nuclei with particles is called artificial transmutation. In this example, an alpha particle (He-12C) is used to bombard a beryllium nucleus (Be) to create a separate nucleus.

10. The picture shows a neutron colliding with a heavy nucleus, causing the nucleus to break into smaller pieces. This process is named nuclear fission.

11. Nuclear fission is a type of nuclear reaction that equation 1 shows. In this reaction a neutron is absorbed by a uranium-235 nucleus, resulting in the release of krypton-92, barium-142, another neutron, and energy. Nuclear fission, which is characterized by the breaking of a heavy nucleus into smaller pieces, occurs during this reaction.

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The compressibility factor is always greater than unity above the Boyle temperature and rises gradually but steadily with pressure.

A real gas begins to act like an ideal gas at a certain pressure range at a temperature, which is known as the boyle temperature. A Boyle temperature is the point at which the second coefficient of an equation reaches zero.

The temperature at which a real gas begins to behave like an ideal gas across a specific range of pressure is known as Boyle's temperature or the Boyle point. Compressibility factor Z and pressure P are represented on a graph.

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The IUPAC name of the compound is propanal and acetone.

Propanal is also called propanaldehyde, and it is an aldehyde which has one double bond and oxygen.

Acetone is a ketone. Ketones have functional group of R2CO.

Thus, the IUPAC name of the compound is propanal and acetone.

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Over the last 50 years, the levels of atmospheric greenhouse gas methane (CH4) have been increasing. Methane is a potent greenhouse gas, and its concentration in the atmosphere has been rising primarily due to human activities.

The increase in methane emissions can be attributed to several factors, including agricultural practices such as livestock farming and rice cultivation, the extraction and distribution of fossil fuels, landfill emissions, and the decay of organic waste. Additionally, natural sources such as wetlands and termites also contribute to methane emissions.

The rise in methane levels is a concern because methane has a significant warming potential compared to carbon dioxide (CO2), although it persists in the atmosphere for a shorter time. It contributes to global warming and climate change.

Efforts are being made to monitor and reduce methane emissions, recognizing the importance of addressing this potent greenhouse gas in mitigating climate change.

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A chemical reaction that has the general formula of nA → (A)n is best classified as a polymerization reaction.

Explanation:

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Answer:c

Explanation:

Answer:

It's organic

Explanation:

Answer:

B) Conduction requires two objects to be in physical contact.

Explanation:

Conduction is when two objects are directly touching each other. So, the objects must come in physical contact with each other.

4.5 days will pass if 2. 40 mg of calcium-47 decayed to 1. 2 mg of calcium-47.

The decay of calcium-47 is a first-order process, so we can use the equation for radioactive decay,

N(t) = N0 * e^(-kt)

where N(t) is the amount of calcium-47 at time t, N0 is the initial amount of calcium-47, k is the decay constant, and e is the base of the natural logarithm.

The half-life of calcium-47 is 4.5 days, so we can use the half-life to find the decay constant,

t1/2 = 0.693 / k

k = 0.693 / t1/2

k = 0.693 / 4.5 days

k = 0.154 days^-1

Now we can use the equation for radioactive decay to find the time elapsed between the initial amount (N0 = 2.40 mg) and the final amount (N(t) = 1.2 mg),

N(t) = N0 * e^(-kt)

1.2 mg = 2.40 mg * e^(-0.154 days^-1 * t)

0.5 = e^(-0.154 days^-1 * t)

ln(0.5) = -0.154 days^-1 * t

t = ln(0.5) / (-0.154 days^-1)

t = 4.50 days

Therefore, approximately 4.5 days have passed since 2.40 mg of calcium-47 decayed to 1.2 mg of calcium-47. However, since we are asked to express our answer using two significant figures, we round the answer to 4.5 days.

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--The complete question is, How many days have passed if 2.40 mg of calcium-47 decayed to 1.2 mg of calcium-47? Express your answer using two significant figures.--

Answer:

179.986995

Explanation:

1 mole is equal to 39.99711 grams.

so muitiply 39.99711 by 4.5 and get 179.986995

Answer:

NH3 and HCl

Explanation:

NH3 and HCl are acids because of their hydrogen ions. NHO3 and NaOH are bases (you can tell because they have an OH). I don't believe SCl2 is an acid or a base

Answer:

A) 0.1 M solution of HCl contains more H3O+ ions than OH- ions. This is because HCl is a strong acid that dissociates completely in water to form H3O+ and Cl- ions. The concentration of H3O+ ions in the solution will be equal to the concentration of HCl, which is 0.1 M. Since water also undergoes autoionization to form H3O+ and OH- ions, the concentration of OH- ions in the solution will be determined by the ion product constant for water (Kw), which is equal to [H3O+][OH-] = 1.0 x 10^-14 at 25°C. Since [H3O+] = 0.1 M, [OH-] = Kw / [H3O+] = 1.0 x 10^-14 / 0.1 = 1.0 x 10^-13 M. Therefore, the concentration of H3O+ ions is greater than the concentration of OH- ions in a 0.1 M solution of HCl, so the correct answer is B) More H3O+ ions than OH- ions.

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The dilution factor is 1:100. The final concentration of cells is 3.6 x 104 CFU/mL. The main answer is that the dilution factor is 1:100 and the final concentration of cells is 3.6 x 104 CFU/mL.


1) Determine the total volume of the diluted culture: Add the volume of the undiluted culture (0.05 mL) to the volume of the sterile diluent (4.95 mL).
Total volume = 0.05 mL + 4.95 mL = 5 mL

2) Calculate the dilution factor: Divide the total volume by the volume of the undiluted culture.
Dilution factor = 5 mL / 0.05 mL = 100

3) Calculate the final concentration of cells: Divide the initial concentration (3.6 x 10^6 CFU/mL) by the dilution factor.
Final concentration = (3.6 x 10^6 CFU/mL) / 100 = 3.6 x 10^4 CFU/mL

The dilution factor is 100, and the final concentration of cells in the diluted culture is 3.6 x 10^4 CFU/mL.

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Answer:

look

Explanation:

diffculte ou my good i need help too

Answer:

Explanation:

A and b are Sodium chloride and Hydrogen chloride which are both compounds.

Answer:

percent yield = 80.7%

Theoretical yield of silver sulfide = 30.975 g

Actual yield  = 25 g

Explanation:

Given data:

Mass of silver = 27 g

Mass of silver sulfide formed = 25 g

Theoretical yield of silver sulfide = ?

Actual yield = ?

Percent yield = ?

Solution:

Chemical equation:

2Ag + S   →     Ag₂S

Number of moles of Ag:

Number of moles = mass/molar mass

Molar mass of silver = 107.8 g/mol

Number of moles = 27 g/ 107.8 g/mol

Number of moles = 0.25 mol

Now we will compare the moles of silver with silver sulfide.

               Ag         :       Ag₂S

               2            :         1

              0.25        :      1/2×0.25 = 0.125 mol

Theoretical yield of silver sulfide:

Mass = number of moles × molar mass

Mass = 0.125 mol ×  247.8 g/mol

Mass = 30.975 g

Actual yield is given in question = 25 g

Percent yield:

Percent yield = (actual yield / theoretical yield) × 100

Percent yield = (25 g/ 30.975 g ) × 100

percent yield = 80.7%

The every 18.02 g of the water contains 6.022 x 10²³ water molecules. For the each molecule contains the three atoms. The number of atoms are there in 500.0 g of water is 5 × 10²⁵ atoms.

The mass of water = 18.02 g

The number of molecules of water = 6.022 x 10²³ molecules

The  number of atoms are there in 500.0 g of water is as follows :

The number of atoms in 500 g of water :

= (500 g water ×  6.022 x 10²³ molecules / 18.02 water) × 3 atoms / 1 molecules

=  5 × 10²⁵ atoms

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Answer:

An aqueous solution is water that contains one or more dissolved substances. The dissolved substances in an aqueous solution may be solids, gases, or other liquids.

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:According to Dalton's law of partial pressures, the total pressure is equal to the sum of the partial pressures of each gas.  In equation form, this looks like this ...

Pt = P1 + P2 + ...

Pt = total pressure

P1 = partial pressure of gas 1

P2 = partial pressure of gas 2

Explanation:

Answer: 500 individual nerds candies for $5 would be better bc u would have more candy and it would last a while

Explanation: would have more candies

To solve this we must be knowing each and every concept related to division. Therefore, 500 individual nerds candy for $5 is preferable since you will have more candy and it will last longer.

Division is one of four fundamental mathematical operations, the others being addition, subtraction, and multiplication. Division is defined as the equal division of larger groups into smaller units.

The division of labor is the sequence of tasks given to and performed by the  group of staff in order to maximize efficiency. The splitting down of a job into multiple separate parts that make up the total is referred to as division of labor. 500 individual nerds candy for $5 is preferable since you will have more candy and it will last longer.

Therefore, 500 individual nerds candy for $5 is preferable since you will have more candy and it will last longer.

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Answer:

A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into aconical flask.

A burette is filled with dilute sulfuric acid.

Write a balanced symbol equation for the reaction between these chemicals when we neutralise.

Explanation:

The reactants of the given reaction are:

sodium hydroxide and dilute sulfuric acid.

The balanced chemical equation of the reaction is:

\(H_{2}SO_{4} (aq) + 2NaOH(aq) -> Na_{2} SO_{4} (aq)+ 2H_{2} O(l)\)

Acid and base raect with each other and form salt and water.

This reaction is called a neutralization reaction.

Answer:

The solid has broken down into pieces so small that its particles spread all throughout the new mixture.

The electronegativities of the period-3 elements are on the transparency. AI and P, Si and S are  period-3 elements. Therefore, option D and E are correct.

The propensity of an atom of a certain chemical element to draw shared electrons when forming a chemical bond is known as electronegativity and is denoted by the symbol. The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity.

Chlorine has a 3.0 electronegativity, compared to sodium's 0.9. Because of the rather large differential of 2.1, sodium and chlorine combine to produce an ionic compound. With hydrogen's electronegativity being 2.1 and oxygen's being 3.5, there is a 1.4 discrepancy.

Thus, option D and E are correct.

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The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

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The mass of magnesium chloride, MgCl₂ obtained from the reaction is 118.75 g

We'll begin by calculating the mass of Mg that reacted and the mass of MgCl₂ obtained from the balanced equation

Mg + 2HCI —> H₂ + MgCl₂

Molar mass of Mg = 24 g/mol

Mass of Mg from the balanced equation = 1 × 24 = 24 g

Molar mass of MgCl₂ = 24 + (35.5×2) = 95 g/mol

Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g

SUMMARY

From the balanced equation above,

24 g of Mg reacted to produce 95 g of MgCl₂.

From the balanced equation above,

24 g of Mg reacted to produce 95 g of MgCl₂.

Therefore,

30 g of Mg will react to produce = (30 × 95) / 24 = 118.75 g of MgCl₂.

Thus, 118.75 g of MgCl₂ were obtained from the reaction.

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E= -5.23 × 10^-19 J/ion pair for Cs+ Br- ion pair.

E= -1.58 × 10^-18 J/ion pair for Mn2+ O2- ion pair.

therefore, lattice energy of second compound is higher than the first one.

Lattice energy is the bond energy of the compound which is now seperated.

Formula: E = (kq1q2)/r

now inserting the values for Cs+ and Br- into the equation,

where q1 = +1, q2 = −1, and r = 441 pm

Energy associated with the formation of a single pair of Cs+Br-

E= 2.31×10^-28 (+1)(-1)/441 × 10^-12

E= -0.00523 × 10^-16

E= -5.23 × 10^-19 J/ion pair

now inserting the values for Mn+2 and O2- into the equation,

where q1 = +2, q2 = −2, and r = 292 pm

Energy associated with the formation of a single pair of Mn+2O-2

E= 2.31×10^-28 (+2)(-2)/292× 10^-12

E= -0.0158 × 10^-16

E= -1.58 × 10^-18 J/ion pair

Therefore comparing both the ion pairs , the lattice energy of Mn+2 O2- pair is higher than the Cs+ Br- ion pair.

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