Please please help me!!!! I WILL GIVE BRAINLIEST

In a solvent of DMSO, the best nucleophile in each of the following pairs would be c. NaSCH3.

NaSCH3, also known as sodium methanethiolate, is a stronger nucleophile compared to water (H20) and methanol (H25). This is due to the presence of a negatively charged sulfur atom in NaSCH3, which makes it a better electron donor and more capable of attacking electrophiles.

Water, on the other hand, is a weaker nucleophile because it has a neutral charge and a partial positive charge on the hydrogen atoms, making it less likely to react with electrophiles. Methanol is slightly more nucleophilic than water due to the presence of the -OH group, but it still has a weaker nucleophilic character compared to NaSCH3. Overall, when considering the strength of nucleophiles in a solvent of DMSO, NaSCH3 would be the best choice for reactions that require a strong nucleophile.

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Answer:

Ley.

Explanation:

En la teoría de la ciencia, la regularidad de los procesos en la naturaleza se denomina ley de la naturaleza. Las leyes naturales se diferencian de otras leyes en que los seres humanos no pueden ponerlas en vigor ni anularlas a su discreción. En tal sentido, la composición química del agua es indudablemente una ley natural, en tanto el hombre no puede modificarla sin modificar las características inherentes del agua como tal.

Answer:

Friction always slows a moving object down. ... Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding.

Answer:

B

Explanation:

it will not be waterproof anymore

Answer:

Likely an issue with the mitral valve.

Explanation:

If I read this correctly, you are likely referring to mitral regurgitation, which is a process where your mitral value does not close tightly enough to stop the blood to flow into left atrium.

Normally, when the left ventricle is full, the mitral valve shuts to prevent blood blood from flowing backward into the atrium while the ventricle contracts, and this allows for blood to go to aorta and to body. According to question since the process is reversed, I am gonna go out on a limb and say mitral valve is likely the structure affected by this since and how I came to conclusion is all the explaintion I did earlier.

To determine the pH of the buffer after adding hydrochloric acid, we need to consider the buffer's composition and its capacity to resist changes in pH.

A buffer solution consists of a weak acid and its conjugate base (or a weak base and its conjugate acid. It helps maintain a relatively constant pH when small amounts of acid or base are added. In this case, we need more information about the specific buffer used in order to calculate the pH accurately. The pH of a buffer depends on the pKa of the weak acid and its concentration, as well as the concentration of the conjugate base. Once the composition of the buffer is known, we can use the Henderson-Hasselbalch equation to calculate the pH:

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

Where:

pH = the pH of the buffer

pKa = the dissociation constant of the weak acid

[A-] = concentration of the conjugate base

[HA] = concentration of the weak acid

Given the volume and concentration of hydrochloric acid added, we would need information about the initial composition of the buffer to determine the resulting concentrations of the weak acid and conjugate base.

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Answer:

Scientific theories are still to be proven while as scientific laws are already proven.

Answer:

A pH scale is used to measure acidity.

Answer:

How acidic or alkaline a substance is.

Explanation:

1 = Strong acid e.g. Stomach acid

7 = Neutral e.g. Water

14 = Strong alkaline e.g. Sodium hydroxide

The calculation of quantities in chemical equations is called stoichiometry. So, the correct option is (d).

By definition, stoichiometry is applying the relationships found in the balanced chemical equation to calculate the amounts of reactants or products in a chemical process. Stoichiometry was first established by Jeremias Benjaim Richter in 1792 as the science of calculating the amounts or mass ratios of chemical elements.

The proportions of variations in the concentrations of species that are interacting chemically are the subject of stoichiometry. Because they contain information about which substances are connected to one another through reactions, their proportions also reveal the topological structure of reaction networks.

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The loss of biological nitrogen fixation over a five-year period would have significant ecological and agricultural consequences, directly impacting ecosystems, food production, and potentially exacerbating environmental issues such as carbon dioxide emissions.

The consequences of the decrease in biological nitrogen fixation due to the spread of the bacteriophage over a period of five years would be significant. Here are the potential impacts and consequences:

1. Impact on Ecosystems: Nitrogen fixation plays a vital role in the nitrogen cycle, where nitrogen gas from the atmosphere is converted into a usable form by nitrogen-fixing bacteria. This fixed nitrogen is essential for the growth of plants and other organisms. With the death of nitrogen-fixing bacteria, there would be a reduction in the availability of fixed nitrogen in ecosystems. This could lead to nitrogen deficiency, limiting plant growth and overall productivity in various ecosystems.

2. Impact on Food Production: Nitrogen is a critical nutrient for plant growth and is often supplemented through nitrogen fixation. A decline in nitrogen fixation would result in decreased availability of nitrogen for crop plants, leading to reduced agricultural productivity. This could result in lower crop yields and potential food shortages, impacting food security for human populations.

3. Increased Reliance on Synthetic Fertilizers: With a decline in natural nitrogen fixation, there would be an increased reliance on synthetic fertilizers to meet the nitrogen requirements of crops. Synthetic fertilizers are manufactured using energy-intensive processes and can have negative environmental impacts, such as contributing to water pollution through runoff and greenhouse gas emissions during production. Increased usage of synthetic fertilizers would exacerbate these environmental issues.

4. Impact on Carbon Dioxide Emissions: Nitrogen fixation is closely linked to the cycling of carbon and nitrogen in ecosystems. Nitrogen availability affects the growth and productivity of plants, which in turn influences the uptake and storage of carbon dioxide through photosynthesis. A decrease in nitrogen fixation would potentially limit plant growth, leading to reduced carbon dioxide uptake by plants. This could contribute to increased atmospheric carbon dioxide levels and exacerbate climate change.

Overall, It is important to note that this scenario assumes a complete absence of biological nitrogen fixation, which is unlikely in reality due to the presence of non-targeted nitrogen-fixing bacteria and other mechanisms of nitrogen input in ecosystems.

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Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

The fraction of 12c in the sample is 60% or 0.6

Isotopes are two or more different atom types that share the same atomic number and are placed in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers. Or, any of two or more types of atoms of a chemical element that have the same atomic number and essentially the same chemical behavior, but have distinct atomic masses or mass numbers and different physical properties. Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, with respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.

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The concentration of the original (undiluted) sample is 20 m.

Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.

C₁V₁ = C₂V₂

where C₁ = initial concentration of sample

V₁ = initial volume of sample = 2.5 ml

C₂ = final concentration after dilution = 0.25m

V₂ = total final volume after dilution = 200 ml

Plug in the values to the formula and solve for the concentration of the original (undiluted) sample, C₁.

C₁V₁ = C₂V₂

C₁(2.5 ml) = (0.25 m)(200 ml)

C₁ = 20 m

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Answer:

honey

Coffee

blood

Explanation:

These components are uniformly distrubuted and these cannot be seperated unlike heterogeneous

Answer:

I believe it 3

291.43mL

According to the combined gas law;

where:

• P₁ and P₂ are the, initial and final pressure, respectively

• V₁ and V₂ are the, initial and final volume, respectively

• T₁ and T₂ are the ,initial and final temperature, respectively (in Kelvin)

Given the following parameters

Substitute the given parameters into the formula to get the final volume V₂

On substituting these values

Hence its volume at a temperature of 80.0 °C and a pressure of 180 kPa is 291.43mL

Answer:

where two plates meet and ring of fire

Answer:

1. Volcanoes and earthquakes often occur where two plates meet.

Explanation:

2. Earthquakes and volcanoes are frequent along The Ring of Fire

Answer:

it is an endothermic reaction

Explanation:

This is because there is a rise in temperature from 20 to 46. this means that the reaction takes in heat from the suuroundings

Answer:

the one that has more power to it

According to the given statement the complete dissociation of ionic compounds is C₆H₁₂O₆ < NaCl ≈ CH₃OH < MgCl₂.

A composite is a material created by the chemical fusion of two or more elements. Bonds and metallic bonding are two typical forms of bonds that hold components in a compound together. Any synthesis will always include each ingredient in a specific ratio.

The formula for osmotic pressure (Π) is

Π = icRT

If T is constant,

Π = kic

C₆H₁₂O₆:

Π

= k × 1 × 1 = k

MgCl₂:

Π

= k × 3 × 1 = 3k

CH₃OH:

Π

= k × 1 × 2 = 2k

NaCl:

Π

= k  × 2 × 1 = 2k

The order of osmotic pressures is  

C₆H₁₂O₆ < NaCl ≈ CH₃OH < MgCl₂

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The complete question is -

The following solutions are prepared by dissolving the requisite amount of solute in water to obtain the desired concentrations. Rank the solutions according to their respective osmotic pressures in decreasing order assuming the complete dissociation of ionic compounds. Rank from highest to lowest osmotic pressure. To rank items as equivalent, overlap them. 1M C6H12O6, 1M MgCl2, 2M CH3OH, 1M NaCl

Endothermic reactions are those in which heat is absorbed from the surroundings.

They are reactions in which heat is absorbed from the surrounding, making the reaction vessels become colder.

It is unlike exothermic reactions in which heat is released into the surrounding, making the reaction vessel to be warmer.

For endothermic reactions, the enthalpy change is always positive because heat is absorbed. It is however negative for exothermic reactions because heat is evolved.

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Answer:

B. 6CO2 + 12H2O + energy =  C6H12O6 + 6O2 + 6H2O

Explanation:

Based on the structure of meta-hydroxyacetophenone and para-hydroxyacetophenone, we can make an assessment of their relative acidity. In both compounds, the hydroxyl group (OH) is attached to the phenyl ring. The position of the hydroxyl group relative to the acetophenone moiety is what distinguishes the two isomers.

In meta-hydroxyacetophenone, the hydroxyl group is attached to the meta position, which means it is three carbons away from the carbonyl group (C=O). In para-hydroxyacetophenone, the hydroxyl group is attached to the para position, meaning it is directly opposite the carbonyl group.The acidity of a phenolic compound is influenced by the stability of the phenoxide ion formed when the hydroxyl group loses a proton (H+). The stability of the phenoxide ion is affected by the electron density and resonance stabilization in the phenyl ring.In the case of para-hydroxyacetophenone, the para position allows for greater electron delocalization and resonance stabilization within the phenyl ring. This increased stability of the phenoxide ion makes para-hydroxyacetophenone more acidic than meta-hydroxyacetophenone.
Therefore, we would expect para-hydroxyacetophenone to be more acidic than meta-hydroxyacetophenone due to the enhanced resonance stabilization of the phenoxide ion in the para position.

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Answer:

Industrial activity increases the emission of greenhouse gases in the atmosphere, especially carbon dioxide (CO2), and it negatively affects climate by increasing global warming.

Two actions to face the global warming:

1- To substitute the use of fossil fuels by alternative clean energy sources such as, for example, hydroelectric, geothermal, solar and wind energy resources.  

2- The government's policies decided to develop electric cars and to stimulate healthy habits such as walking instead of the use of conventional fossil-fueled transport modes.

Answer:

18.015

Explanation:

That other guy is on something, their answer didn't relate to the question at all. Anyways.. Jesus loves YOU!

Here is the answer in picture form

The value of ΔG at 298 K for a reaction mixture containing 1.9 atm N2, 1.6 atm H2, and 0.65 atm, the answer is (a) -3.86 × 10^3.

NH3 can be calculated using the equation:

ΔG = ΔG° + RT ln(Q)

where ΔG is the standard Gibbs free energy change, ΔG° is the standard Gibbs free energy change at standard conditions, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

In this case, we are given ΔG° as -33.3 kJ/mol. To calculate Q, we need to use the partial pressures of the gases in the reaction mixture. The reaction stoichiometry tells us that the ratio of the partial pressures of N2, H2, and NH3 is 1:3:2. Therefore, we can write:

Q = (P(NH3))^2 / (P(N2) * P(H2)^3)

Plugging in the given values of P(N2) = 1.9 atm, P(H2) = 1.6 atm, and P(NH3) = 0.65 atm, we can calculate Q. Then, using the value of R = 8.314 J/(mol·K) and the temperature T = 298 K, we can substitute these values into the equation and solve for ΔG.

The calculated value of ΔG at 298 K for the given reaction mixture is approximately -3.86 × 10^3 J/mol. This value is equivalent to -3.86 kJ/mol. Therefore, the answer is (a) -3.86 × 10^3.

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The volume and shape of a nanoparticle determines how it interacts with light. This determines the color of a nanoparticle solution.

The coloration depends on the size and form of the nanoparticles, in addition to the distance between them. Right here, the red nano gold particles are approximately 20 nanometers across, whilst the orange nano gold particles are about 80 nanometers across.

Nanoparticles appear positive colors because they mirror (scatter) and take in unique wavelengths of visible light. Light which seems white is a more or less same combination of the wavelengths of light that can be perceived by means of the human eye, more or less four 100 to 750 nm.

As particle length increases, the wavelength of surface plasmon resonance associated absorption shifts to longer, redder wavelengths. red light is then absorbed, and blue light is pondered, yielding answers with a faded blue or red color.

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The density of the substance is 0.77 g/cm³.

The density of a substance is calculated by dividing its mass by its volume. In this case, the mass of the substance is 85g and the volume is 110cm³.

Density = Mass / Volume

Density = 85g / 110cm³

To obtain the answer, we divide 85g by 110cm³.

Calculating the division, we find that the density of the substance is approximately 0.77 g/cm³.

Therefore, the density of the substance is 0.77 g/cm³.

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Liquid is the state of matter that has particles close together but can slide past each other.

Liquid is an incompressible fluid. It gains the shape of the container in which it is placed. It has nearly constant volume. It is independent of pressure. It can flow so that its particles can slide past each other. Density of liquid is closer to solid. Its particles are bound firmly but not rigidly. The most common example of liquid is water.

If we heat a liquid ,the atoms or molecules gain kinetic energy . If the temperature becomes sufficiently high, the liquid becomes a gas.

If we decrease the temperature of the liquid, the atoms or molecules lose kinetic energy. If the temperature becomes low enough, the liquid becomes a solid.  Example ice

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