100 POINTS AND BRAINLIEST PLEASE HELP ASAP For this assignment, you will write a research essay, or create a presentation, about a scientist who contributed knowledge to the field of chemistry. Your essay, or presentation, should include the following information about your scientist: Describe your scientist's contributions and innovations to his or her field. How did your scientist's research and data influence future use of his or her findings? Describe the background, interests, or goals that affected your scientist's observations and conclusions. Once you have selected a scientist, you will need to locate at least three different reliable resources to use to conduct your research. You may use textbooks, the Internet, or library books. These resources should be cited within your presentation and should be listed in a bibliography that you submit with your essay, or slide presentation. Use the Citations, Essay Writing, and Finding Reliable Resources tutorials to guide your writing. If you have another method by which you would like to present your research findings, please have it approved by your instructor before you begin writing. No matter what presentation style you choose, be sure to use complete sentences and paragraphs, and include all of the necessary research required. You should also review the grading rubric before you begin. Select one of the following scientists, or pick another scientist of interest with your instructor's permission, to conduct your research on: Yuan T. Lee

Yes, genetic drift causes allele frequencies to change by chance and does not work to produce adaptations.

Genetic drift is a random process that occurs when the frequency of alleles in a population changes by chance, rather than as a result of natural selection. This means that genetic drift does not result in adaptations because it does not favor specific traits that provide a survival or reproductive advantage.

Genetic drift is particularly significant in small populations where random events can have a larger impact on allele frequencies. Over time, genetic drift can lead to the loss of genetic variation within a population, making it less capable of adapting to environmental changes. It is important to note that genetic drift acts independently of natural selection, which is a non-random process that drives the evolution of beneficial adaptations in a population.

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When the child sits on the partially filled balloon, the pressure of the balloon increases. The pressure change is a doubling of the initial pressure, indicating a factor of 2 increase.

When the child sits on a partially filled balloon, the volume of the balloon decreases by half. According to Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature, the pressure inside the balloon increases.

Let's consider the initial volume of the balloon as V and the initial pressure as P. When the volume decreases by half, it becomes V/2. Since the amount of gas remains constant, the pressure increases to maintain equilibrium. The new pressure can be denoted as P'.

According to Boyle's Law, P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume. Plugging in the values, we have P * V = P' * (V/2).

Simplifying the equation, we get P' = 2P. This means the pressure of the balloon increases by a factor of 2, or it doubles. So, the pressure change can be expressed as an increase of two times the original pressure.

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Answer:

Li3N

Explanation:

Lithium nitride is a compound with the formula Li₃N

Hope this helped!!!

Answer:

C

the next answer is B

the next one is C

Explanation:

The initial and final pressures are not given, we cannot determine the exact value of \(T_{2}\)without that information. The pressure values would be needed to complete the calculation.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance, such as a gas, liquid, or solid. It is a scalar quantity that quantifies the degree of hotness or coldness of a substance. Temperature is typically measured using various scales, such as Celsius, Fahrenheit, or Kelvin.

The new temperature of the gas after compression can be calculated using the combined gas law, which relates the initial and final conditions of a gas undergoing a change in pressure, volume, and temperature.

The combined gas law is given by:

We can rearrange the equation to solve for \(T_{2}\):

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560 mL of gas is at 43.0 C. It is compressed to a volume of 52.0 mL. The new temperature of the gas will be 277.05K

What is ideal gas law ?

The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be ideal if its particles (a) do not interact with one another and (b) occupy no space (have no volume).

The law states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gram of an ideal gas.

V1/T1 ⇒ V2/T2

V1 ⇒ 560ml

T1 ⇒ 43.0 C

V2 ⇒ 52ml

T2⇒?

T2 ⇒ V2T1/V1

T2 ⇒ 52*43/560

T2 ⇒ 3.9 degree C i.e. 277.05K

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Answer:

unbalanced

Explanation:

as the atoms on the one side do not equal to the atoms on the other sides

An sp² hybridized central carbon atom with no lone pairs of electrons has 1 π bond and 3 σ bonds. So, the correct option is b. 1 π and 3 σ bonds.

An sp^2 hybridized central carbon atom with no lone pairs of electrons has 3 sigma (σ) bonds and 1 pi (π) bond. In sp^2 hybridization, the carbon atom hybridizes one s orbital and two p orbitals to form three sp^2 hybrid orbitals. These hybrid orbitals have trigonal planar geometry, with 120 degrees between each other. The remaining unhybridized p orbital lies perpendicular to the plane of the three hybrid orbitals.

The three sp^2 hybrid orbitals overlap with the orbitals of three other atoms, forming three sigma (σ) bonds. These are strong, directional bonds that result from head-on overlap of atomic orbitals. The fourth bond is formed by the unhybridized p orbital, which can form a pi (π) bond with another atom's p orbital that is perpendicular to the sigma bonds. The pi bond results from sideways overlap of the p orbitals, and is weaker than the sigma bonds.

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Answer:

double displacement reaction also neutralization reaction cause of acid and base

Answer:

Double Replacement Reaction

Explanation:

KOH + H₃PO₄ --> K₃PO₄ + H₂O

AB + CD --> AD + BC

K goes with PO4 and H goes with OH

Answer:

The temperature at which the vapor pressure of a liquid is just equal to the external ... The conversion of a liquid to a gas below the boiling point is called ... equilibrium temperature of the mixture was 36.0 °C. What is the specific heat (J/ g°C) of the metal

Explanation:

Answer:

1.nhl

Explanation:

The concentration of copper in the new alloy is a function of the change in the amount of copper added or removed (i.e., the value of kg).

When copper is added, the proportion of copper in the alloy increases, resulting in a higher concentration of copper. Conversely, when copper is removed, the proportion of tin in the alloy increases, resulting in a lower concentration of copper.
The concentration of copper in the new alloy depends on the amount of copper added or removed.

This is an important factor to consider when creating bronze alloys for specific purposes, as the concentration of copper can affect the properties and characteristics of the alloy.

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The result if heat is added to an endothermic reaction is that it will increasing the amounts of the products and will decreasing the amounts of the reactants.

If the reaction is the endothermic reaction and if we add the heat to the endothermic reaction then it will  increase in the temperature and it will cause the forward reaction to occur, and increasing the amounts of the products and will decreasing the amounts of the reactants. The Lowering of the temperature will be produce the opposite of the response.

Thus, the increase in the amount of the product occurs if we add the heat to the endothermic reaction.

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The geometrical configuration of the electron groups around the main atom is known as the electron geometry. The geometrical positioning of the surrounding atoms around the core atom is known as molecular geometry.

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In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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To balance the chemical equation PC15 + H2O → H3PO4 + HCl using linear algebra technique, we can set up an augmented matrix and solve the system of equations. Here's the step-by-step process:

Create a matrix or put it in vector form by assigning variables to P, Cl, H, O: Let's assign:

P = x (coefficient for PCl5)

Cl = y (coefficient for HCl)

H = z (coefficient for H3PO4)

O = w (coefficient for H2O)

The equation becomes: xPCl5 + yH2O → zH3PO4 + wHCl Set up the equation in matrix form:

| PCl5 | + | H2O | = | H3PO4 | + | HCl |

| 1 | + | 0 | = | 0 | + | 0 |

| 0 | + | 2 | = | 0 | + | 0 |

| 0 | + | 0 | = | 1 | + | -1 |

| 0 | + | 0 | = | 0 | + | 24 |

This gives us the augmented matrix form:

| 1 0 0 0 0 |

| 0 1 2 0 0 |

| 0 0 0 1 -1 |

| 0 0 0 0 24 |

Solve the system using row operations: Performing row operations to simplify the augmented matrix:

R2 = R2 - 2R1

R4 = R4 / 24

The simplified augmented matrix becomes:

| 1 0 0 0 0 |

| 0 1 0 0 0 |

| 0 0 0 1 -1 |

| 0 0 0 0 1 |

From the simplified matrix, we can assign values to the variables:

P = 0

Cl = 0

H = 0

O = 0

This implies that the coefficients for PCl5, H2O, H3PO4, and HCl are all zero. Enter the coefficients into the chemical equation: The balanced chemical equation is:

0PCl5 + 0H2O → 0H3PO4 + 0HCl

Therefore, the balanced equation is: PCl5 + H2O → H3PO4 + HCl (unbalanced)

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Answer:

Conversion of kinetic energy to potential energy (chemo mechanical energy)

In the state of rest, the rubber is a tangled mass of long chained cross-linked polymer that due to their disorderliness are in a state of increased entropy. By pulling on the polymer, the applied kinetic energy stretches the polymer into straight chains, giving them order and reducing their entropy. The stretched rubber then has energy stored in the form of chemo mechanical energy which is a form of potential energy

Conversion of the stored potential energy in the stretched to kinetic energy

By remaining in a stretched condition, the rubber is in a state of high potential energy, when the force holding the rubber in place is removed, due to the laws of thermodynamics, the polymers in the rubber curls back to their state of "random" tangled mass releasing the stored potential energy in the process and doing work such as moving items placed in the rubber's path of motion such as an object that has weight, w then takes up the kinetic energy 1/2×m×v² which can can result in the flight of the object.

Explanation:

Answer:

Elastic potential energy------> kinetic energy --------> elastic potential energy

Explanation:

Elastic potential energy is the energy stored in a spiral spring. When a rubber band is stretched, this elastic potential energy is capable of doing work. This energy is just stored inside the rubber band and released when work is done by the rubber band.

Once the rubber band is released and it is in motion, the energy of the rubber is kinetic energy.

The system is similar to a simple pendulum.

In a mass spectrometry (mass spec) analysis of a compound with one chlorine atom and a compound with one bromine atom, the key differences will be observed in the mass-to-charge ratio (m/z) of their respective molecular ion peaks and isotopic patterns.

A compound with one chlorine atom will show a molecular ion peak at its molecular weight (M) and a second peak at M+2 due to the natural presence of the stable isotope chlorine-37. The ratio of M to M+2 peaks will be approximately 3:1, as the natural abundance of chlorine-35 is about 75% and chlorine-37 is about 25%.
On the other hand, a compound with one bromine atom will show a molecular ion peak at its molecular weight (M) and a second peak at M+2, similar to chlorine. However, the ratio of M to M+2 peaks will be approximately 1:1, as the natural abundance of bromine-79 is about 50% and bromine-81 is about 50%. A mass spec of a compound with one chlorine atom will have a 3:1 ratio for M and M+2 peaks, while a compound with one bromine atom will have a 1:1 ratio for the same peaks, allowing us to differentiate between the two.

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The formula of Hypolaryous acid wold depend on the valency of hydrogen and the valency of Laryine. The formula of  Hypolaryous acid will be HLy.

Hydrogen is an element in found in group 1 while Laryine is a halogen. Halogens are placed in group 17 while hydrogen is placed in group 1 for convenience.

Both hydrogen and Laryine have a valency of + 1. This implies that the compound formed by the two elements (Hypolaryous acid) will have the formula HLy.

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The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.

The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.

In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.

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Option (B) ΔS universe is correct .

According to the Second Law of Thermodynamics, for a reaction to be spontaneous, the value that must increase is B) ΔS universe (the change in entropy of the universe).

The Second Law of Thermodynamics states that the entropy of the universe tends to increase for spontaneous processes. The entropy change of the universe (ΔS universe) is the sum of the entropy change of the system (ΔS sys) and the entropy change of the surroundings (ΔS surr):

ΔS universe = ΔS sys + ΔS surr

The entropy change of the system (ΔS sys) can be positive or negative, depending on the nature of the reaction. However, for a spontaneous reaction, the entropy change of the universe (ΔS universe) must be positive.

When a reaction occurs spontaneously, it is often associated with an increase in the total entropy of the system and its surroundings. This means that both the system and the surroundings experience an increase in their respective entropy values, but the magnitude of the increase in the surroundings' entropy is typically greater. Therefore, the value that must increase for a spontaneous reaction according to the Second Law of Thermodynamics is ΔS universe.

According to the Second Law of Thermodynamics, for a reaction to be spontaneous, the entropy change of the universe (ΔS universe) must increase. This principle highlights the tendency of the universe to move towards higher entropy states during spontaneous processes. While the entropy change of the system (ΔS sys) can be positive or negative, it is the overall change in entropy of the universe that determines the spontaneity of a reaction.

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Answer:

The correct option is;

a. Delocalised electrons

Explanation:

The particles that enable electrical conductivity are the delocalised electrons

The metallic structure consists of identically shaped elements having positive ions that have a resultant alignment, surrounded by a vast array of deloclised electrons, which move freely in the metallic structure such that a metallic part usually has a high electrical conductivity.

Therefore, the freely moving delocalised electron in a metal give them the property of good conductors of electricity.

The compound that is likely to have the lowest boiling point is d). CH4.

Boiling point is the temperature at which a liquid becomes a gas. It is determined by the strength of the intermolecular forces between the molecules of the compound. The stronger the intermolecular forces, the higher the boiling point.

In the case of the compounds listed, they are all alkanes, which are nonpolar and only have London dispersion forces between their molecules. London dispersion forces are the weakest type of intermolecular force, and their strength depends on the size of the molecule. The larger the molecule, the stronger the London dispersion forces and the higher the boiling point.

Since CH4 is the smallest molecule among the options, it will have the weakest London dispersion forces and the lowest boiling point.

Therefore, the answer is d). CH4.

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The electrostatic potential energy between an electron and a proton that are separated by 53pm is 4.27 × 10^-18 J.

The electrostatic potential energy between two charged particles can be calculated using the

formula U = k*q1*q2/r,

where:

k is the Coulomb constant,

q1 and q2 are the charges of the two particles, and

r is the distance between them.

In this case, we have q1 = -1.60*10^-19 C (charge of the electron), q2 = 1.60*10^-19 C (charge of the proton), and r = 53 pm = 5.3*10^-10 m. Plugging these values into the formula, we get:

U = (8.99*10^9 N m2/C2)*(-1.60*10^-19 C)*(1.60*10^-19 C)/(5.3*10^-10 m)

U = 4.27 × 10^-18 J

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Answer:

Check the electronic configuration of elements.

Explanation:

▪Valence electrons are the elwctrons present in the outermost shell of any element.

For example,

Electronic Configuration of Sodium = 2,8,1

Here , Sodium has 1 valence electrons.

▪Valency of an element is the total no. of electrons to be gained/losed in order to achieve duplet/octate state.

For example,

Electronic configuration of Sodium = 2,8,1

Sodium can achieve octate state either by losing 1 electron or gaining 7 electrons. But losing 1 electron is eay than gaining 7 electrons. So Valency of Sodium = +1

☆Metals have 1 or 2 or 3 valence electrons.

☆Non metals have 4 or 5 or 6 or 7 valence electrons.

☆Noble gases tend to stay in duplet/octate state i.e they have 2 or 8 valence electrons.

Answer:

C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + H₂O

Explanation:

When a forest burns and all that's left is some ash,  most of the mass of the trees go to the atmosphere, in the form of carbon dioxide.

In a total combustion process of organic matter, the two molecules produced are carbon dioxide and water. (CO₂ and H₂O)

The equation for the combustion of glucose is:

C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + H₂O

Answer:  i think C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + H₂O

Explanation:

Based on the calculations, the total pressure of the final products is equal to 1.76 atm.

From the information provided about this chemical reaction, we can logically deduce the following parameters:

Next, we would write the properly balanced chemical equation for this chemical reaction:

                               I₂ + 5F₂   ⇒  2IF₅

Also, we would determine the number of moles of each atom of I₂ and F₂:

\(Number \;of \;moles = \frac{mass}{molar\;mass}\)

Substituting the given parameters into the formula, we have;

Number of moles = 63.45/253.8

Number of moles = 0.25 moles.

Assuming I₂ were limiting, we would need:

5 × 0.25 = 1.25 moles of F₂.

For fluorine gas, we have:

PV = mRT/MM

Mass, m = PVMM/RT

Mass, m = 2.5(5.00)(38)/(0.0821 × 298)

Mass, m = 475/24.4658

Mass, m = 19.42 grams.

Number of moles = 19.42/38

Number of moles = 0.51 moles.

The total number of moles = 0.25 + 0.51 = 0.76 mol.

For the mole fraction of I₂, we have:

Mf = 0.25/0.76

Mole fraction = 0.33.

For the mole fraction of F₂, we have:

Mole fraction = 1 - 0.33 = 0.67.

Next, we would determine the total pressure of the two elements by applying Dalton's law:

Total pressure = 0.33 × 0.27 + 0.67 × 2.5

Total pressure = 1.76 atm.

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The enthalpy change of the reaction in terms of kJ/mol KOH is -11.902 kJ/mol  KOH.

To calculate the enthalpy change of the reaction in terms of kJ/mol KOH, we need to first determine the amount of KOH that reacted with the HCl. Using the given concentration and volume of HCl, we can calculate the number of moles of HCl:

1.5 mol/L * 0.100 L = 0.150 mol HCl

Since KOH and HCl react in a 1:1 molar ratio, the amount of KOH used in the reaction is also 0.150 mol.

Next, we need to calculate the heat released or absorbed by the reaction using the formula q = mCΔT, where q is the heat absorbed or released, m is the mass of the solution, C is the specific heat of the solution, and ΔT is the change in temperature.

The mass of the solution can be calculated using the density:

mass = volume * density = 100 mL * 1.00 g/mL = 100 g

Thus, q = 100 g * 4.185 J/g*K * (34.5°C - 30°C) = 1785.3 J

Finally, we can use the formula ΔH = -q/n, where n is the number of moles of KOH, to calculate the enthalpy change of the reaction:

ΔH = -1785.3 J / 0.150 mol = -11902 J/mol

Converting to kJ/mol:

ΔH = -11.902 kJ/mol

Therefore, the enthalpy change of the reaction in terms of kJ/mol KOH is -11.902 kJ/mol.

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass = 35 g

volume = 7 cm³

The density is

\(density = \frac{35}{7} \\ \)

We have the final answer as

Hope this helps you

The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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Answer:

Bond broking

Explanation:

Bond broking.

Answer:

\(^{}\)wer here. Link below!

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bit.\(^{}\)

Explanation: