what effect do you think global warming might have on the availability of fresh water

Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles

A mole is defined as 6.02214076 × 10²³ of some chemical unit, be it atoms, molecules, ions, or others.

Given:

volume=9.8 mL

Density= 0.960 g/mL

Percent concentration of solution= 25%

mass of nickel chloride=1.85 g

mass = density * volume

mass = 0.950 g/ml * 9.8 ml

mass = 9.31g

Since it is a 25 % solution of Ethylenediamine

mass of  ethylenediamine in 25 moles

moles of ethylenediamine = \(\frac{2.33g}{60g/mol}\)  =0.0388 moles

Thus, Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles.

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Answer:

its b

Explanation:

just did the test on A P E X

If the isotope models are accurate, One shows 8 neutrons, and one shows 9. Therefore, the correct option is option B.

A chemical element's isotope is one of more than one species of atoms that share the same atomic number, spot on the periodic table, and almost identical chemical activity, but differ in atomic mass and physical characteristics. There are a number of isotopes for each chemical element.

The first step in identifying and labelling an atom is to count the protons within its nucleus. Usually, this nuclear number is denoted by the letter Z. The fact that all atoms possessing the same number of electrons have essentially equal chemical characteristics lends the atomic number its enormous significance. If the isotope models are accurate, One shows 8 neutrons, and one shows 9.

Therefore, the correct option is option B. If the isotope models are accurate, One shows 8 neutrons, and one shows 9.

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Answer:

during reaction magnesium lises ions.

Explanation:

magnesium reacts by losing two ions which makes it smaller in size.

1.45 is the ratio of their velocities. The typical kinetic energy (K) of a gas molecule is equal to one-half of its mass (m) multiplied by its RMS speed (vrms) square.

Average Speed and Kinetic Energy The average speed of air molecules increases as temperature as well as average kinetic energy rise.

The typical kinetic energy (K) of a gas molecule is equal to one-half of its mass (m) multiplied by its RMS speed (vrms) square.

K.E. of HCl=1/2× mass of HCL (Volume of HCI)²

K.E. NH\(_3\)=1/2× mass of NH\(_3\) (VNH\(_3\))²

1/2× mass of NH\(_3\) (VNH\(_3\))²=1/2× mass of HCL (Volume of HCI)²

mass of NH\(_3\) ×(VNH\(_3\))²=mass of HCL ×(Volume of HCI)²

17.03×(VNH\(_3\))²= 36.4×(Volume of HCI)²

(VNH\(_3\))²/ (Volume of HCI)²= 36.4/17.03

(VNH\(_3\))²/ (Volume of HCI)²= 2.13

(VNH\(_3\))/ (Volume of HCI=1.45

Therefore, 1.45 is the ratio of their velocities.

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The substance with the higher freezing point depression is CaCl2.

Water freezes at 0° C in normal conditions but once water is mixed with other substances this temperature can change.

As previously mentioned, the freezing point changes according to the substance water is mixed with, here are the changes for the listed substances:

Based on this, the one that has the greatest freezing point depression is CaCl2.

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They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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Answer:

A.) Change only the coefficients

Explanation:

An equation is balanced when there is an equal quantity of each type of element on both sides of a reaction. When balancing an equation, the only way to manipulate the amounts of each element is by changing the coefficient values. The coefficients alter the amount of each molecule in the reaction.

The subscripts cannot be altered. If you were to change the subscripts, you would be altering the amount of atoms in a particular molecule.

Answer:

A. Oxygen pushes electrons towards the hydrogens.

Explanation:

The oxygen is reduced because it undergoes a partial gain of electrons. The oxygen atom in water has greater electron density near it than they did in the O₂ molecule.

Reduction is a chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased.

The electrons taken up by the substance reduced are supplied by another substance, which is thereby oxidized.

The hydrogen is oxidized because it added oxygen to form water.

Conversely the oxygen is reduced because it added hydrogen to form water.

Therefore, The oxygen is reduced because it undergoes a partial gain of electrons. The oxygen atom in water has greater electron density near it than they did in the O₂ molecule.

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Answer:

PLEASE MARK ME AS THE BRAINLIEST ANSWER :)

Explanation:

Phenols are much more acidic than alcohols because the negative charge in the phenoxide ion is not localized on the oxygen atom, as it is in an alkoxide ion, but is delocalized-it is shared by a number of carbon atoms in the benzene ring.

Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

The equilibrium constant for the system at this temperature is\(1.17 × 10^-31 mol^2/L^2\).

For the chemical equation:

N2(g) + O2(g) ⇌ 2NO(g)

The equilibrium mixture at a temperature of 1500 K is determined to contain 6.4 × 10^-3 mol/L of N2,\(1.7 × 10^-3\)mol/L of O2 and 1.1 × 10^-5 mol/L of NO.  First, we need to calculate the concentration of N2 and O2 required to produce

1.1 × 10^-5 mol/L of NO:

2NO(g) = N2(g) + O2(g)

Given that there are 1.1 × 10^-5 mol/L of NO, the number of moles of N2 and O2 are equal since the stoichiometric ratio is 1:1. Therefore:

\(1.1 × 10^-5 mol/L\) = [N2][O2]Kc = \(([NO]^2)/([N2][O2])Kc\)= \((1.1 × 10^-5 mol/L)^2/(6.4 × 10^-3 mol/L)(1.7 × 10^-3 mol/L)Kc\) =

1.17 × 10^-31 mol^2/L^2.

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Answer:The sun's enormous heat rips electrons off the hydrogen and helium molecules that make up the sun. ... Thomas Jefferson National Accelerator Facility

Explanation:

Answer:

C8H18(g) + 12.5O2(g) -> __8__CO2(g) + 9H2O(g) + heat

CH4(g) + _2___O2(g) -> ____CO2(g) + _2___H2O(g) + heat

C3H8(g) + _5___O2(g) -> _3___CO2(g) + __4__H2O(g) + heat

2C6H6(g) + __15__O2(g) ->  __12__CO2(g) + __6__H2O(g) + heat

Explanation:

I hope it helps!

Fossil fuels are natural energy resources formed from the remains of ancient plants and organisms, such as coal, oil, and natural gas, which are burned to release energy.

Balanced reactions are as follows:

C₈H₁₈ (g) + 12.5O₂ (g) → 8CO₂ (g) + 9H₂O(g) + heat

CH₄ (g) + 2O₂ (g) → 1CO₂ (g) + 2H₂O (g) + heat

C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) + heat

C₆H₆ (g) + 7.5O₂ (g) → 6CO₂ (g) + 3H₂O (g) + heat

A combustion reaction, also known as a combustion process, is a chemical reaction in which a substance combines with oxygen to produce heat and light. It involves the rapid oxidation of a fuel in the presence of an oxidizer, typically atmospheric oxygen. The reaction releases energy in the form of heat and light.

The general equation for a combustion reaction can be represented as: fuel + oxygen → carbon dioxide + water + energy.

Combustion reactions are essential for various processes, including the burning of fossil fuels for energy production, combustion engines in vehicles, and even the process of respiration in living organisms.

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You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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From the calculation, the pH of the solution can be obtained as 0.39.

We first have to obtain the dissociation constant of the solution;

α = √Ka/C

Ka = Cα^2

Ka = 4.9 * 10^-3 * 6

Ka = 0.0294

Then we have that;

0.0294 = [x]^2/[6 - x]

0.0294 * [6 - x] = x^2

0.1764 - 0.0294 x = x^2

x^2 +  0.0294 x - 0.1764 =0

x = 0.41 M

Thus the pH of the solution is;

pH = -log[0.41]

= 0.39

pH is an important parameter in chemistry, biology, and many other fields, as it can affect the behavior and properties of substances and reactions.

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From the calculation, the molecular mass of the  compound would be C2H4O2

We know that the molecular formula can be obtained from the use of the system;

Percentage of oxygen = 100 - (40 + 6.7)

= 53.3 %

C - 40/12,  H - 6.7/1,  O - 53.3/16

C - 3.33,  H - 6.7, O - 3.33

Dividing through by the lowest ratio we have that

CH2O

We are told that the relative molecular mass of the compound is 60 then we have that;

(12 + 2 + 16)n = 60

n = 2

The molecular formula is;

C2H4O2

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The Correct electron configuration of carbon as 1s² 2s² 2p². Option B.

To understand why this is the correct electron configuration, let's break it down step by step:

The atomic number of carbon is 6, which means it has six electrons. Electrons are distributed in energy levels or shells around the nucleus.

The first shell, known as the 1s orbital, can hold a maximum of 2 electrons. Therefore, the first part of the electron configuration is 1s², indicating that two electrons occupy the 1s orbital.

The second shell has two subshells: the 2s orbital and the 2p orbital. The 2s orbital can hold a maximum of 2 electrons, while the 2p orbital can hold a maximum of 6 electrons. In the case of carbon, after the 1s orbital, two more electrons occupy the 2s orbital. So far, we have 1s² 2s².

The remaining two electrons in carbon are placed in the 2p orbital. The 2p orbital consists of three separate p orbitals: 2px, 2py, and 2pz. Each p orbital can hold a maximum of 2 electrons. Therefore, the last part of the electron configuration for carbon is 2p², indicating that two electrons occupy the 2px and 2py orbitals. Option B is correct.

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Answer:

At 10ºC or 50ºF water can cotain the most dissolved sugar.

Answer:

yes but first he need to check himself

Explanation:

bcoz if he cannot produce a sperm than she might have cheated him and the baby might be of someone other.

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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The reaction you underwent was anhydride. Anhydride behavior is strikingly similar to that of acid chloride.  the motion of electrons, use a curving arrow. consist of all lone pairings. Any leftover acetic anhydride was destroyed by the addition of water. the end result of adding water to acetic anhydride.

What is acetic anhydride?

An anhydride functions very much like an acid chloride. electron movement is depicted by the curved arrow. An anhydride functions very much like an acid chloride. the motion of electrons, use a curving arrow. consist of all lone pairings. In a condensation reaction involving the elimination of a water molecule, acetic anhydride is created from two acetic acid molecules.

D and L-structures phenylalanine's are made up of amino acids, which both have amino groups.

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Answer:

Less than 7

Explanation:

during the titration of strong acid and weak base, the weak base is usually kept in the flask and strong acid is kept in the burette. So when we add strong acid slowly drop by drop, slowly the pH level of solution starts to decrease and at equivalence point the acid overpowers the base as a strong acid was taken over a weak base.

The electronic configuration 1s2,2s2,2p6,3s2  belongs to Magnesium.

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The correct structure that corresponds to the name in the image above is structure A. Details about hydrocarbons can be found below.

Alkanes are organic compound that belongs to any acyclic saturated hydrocarbon e.g. methane, ethane, etc.

Alkanes have a single carbon bond and can be attached to by certain compounds. Methyl is a compound with the formula; CH3.

Therefore, the correct structure that corresponds to the name in the image above is structure A.

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Answer:

C

Explanation:

It was right on acellus

The conversions that could be performed with these two conversion factors alone, Density—> molar mass or/formula mass—> is volume ---> moles; option D

Conversion factors are expressions or values which are used to convert from one unit or value to another.

The conversion factor given is:

Density—> molar mass or/formula mass—>

volume = density/mass

moles = mass/molar mass

Volume to moles = density/mass -->  mass/ molar mass

Volume to moles = density ---> molar mass or formula mass

The conversion of volume to moles will therefore require density and molar mass or formula.

In conclusion, conversion factors are used to convert from one unit  value to another.

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Answer:

The purpose of adding an aqueous solution of sodium bicarbonate is either to extract a certain compound or to remove/neutralize acidic compounds present in the reaction mixture.

Explanation:

Upon adding sodium bicarbonate, carbon dioxide is released (gaseous state at room temperature), which helps build up pressure that is able to push out the unwanted gas/liquid.

The heat of vaporization of CH3CN is obtained from the question as 25 KJ/mol.

We can obtain the number of moles from;

PV = nRT

P = 1 atm

V = 1.17 L

n = ?

R = 0.082 atm LK-1mol-1

T = 81.6 °C + 273 = 354.6 K

n = PV/RT

Substituting values;

n =  1 atm × 1.17 L/0.082 atm LK-1mol-1 × 354.6 K

n = 0.04 moles

Using; q = n·ΔHv

q = Heat absorbed

n = number of moles

Hv  = Heat of vaporization

ΔHv = q/n

ΔHv = 1.00 × 10^3/0.04

ΔHv = 25 KJ/mol

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