the pka values for some indicators are given below. which of the indicators listed would be suitable for a titration with a ph of 2.97 at the equivalence point?

Commercial agriculture can lead to water-quality problems because water can be used for irrigation and washing chemical products.

The term commercial agriculture makes reference to the techniques to produce high yields in extensive crops.

Commercial agriculture may lead to contamination problems due to the use of herbicides and pesticides.

In conclusion, commercial agriculture can often lead to water-quality problems because water can be used for irrigation and washing chemical products.

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Answer:

An intermolecular force is the force of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions). Whereas the covalent bonds are the interatomic linkage that results from the sharing of an electron pair between two atoms.

Intermolecular forces hold molecules together in a liquid or solid. Intermolecular forces are generally much weaker than covalent bonds.

The lines representing Bag B and Bag C in the graph represent bags that contain a solution that is hypertonic at 50 minutes.

In order to determine which line(s) in the graph represent(s) bags that contain a solution that is hypertonic at 50 minutes, we need to first understand the concept of tonicity. Tonicity refers to the relative concentration of solutes in two solutions separated by a selectively permeable membrane. A hypertonic solution is one in which the concentration of solutes is greater than that of the solution on the other side of the membrane.

From the graph, we can see that as time increases, the percent change in mass of each bag changes. The bags with a higher concentration of sucrose will lose water to the surrounding solution, causing their mass to decrease. Conversely, the bags with a lower concentration of sucrose will gain water, causing their mass to increase.

To determine which line(s) represent(s) bags with a hypertonic solution at 50 minutes, we need to look for bags that have lost mass, indicating that they have a higher concentration of solutes than the surrounding solution. Based on the graph, it appears that Bag B and Bag C have lost mass, indicating that they are hypertonic at 50 minutes. Bag A has gained mass, indicating that it is hypotonic, and Bag D and Bag E have not changed significantly in mass, indicating that they are isotonic.

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480 meters

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Answer:

Mountains

Explanation:

Mountains are colder than the lower elevations.  When humid air enters a cooler region, the saturated air begins to cool  and this reduces the ability of the air to maintain the evaporated water is the gas state.  Molecules of water have reduced enerfy at the cooler temperatures.  They will slow down and coalesce with other water molecules to form small droplets of water.  The atmoshere cannot hold these heaevier droplets and they begin to fall  (i.e., rain).

One migh ask why does the air temperature drop at higher altitudes?  Heat rises, so why shouldn't it be warmer on top a mountain, compared to the valley.  The reason is that the atmosphere becomes less dense the further from Earth's center on gets.  This less dense air has a lower water saturation point, so it rains.

The specific heat of the metal is 0.30J/g°C.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Step 1: Data given

Mass of metal = 75.0 g

Temperature of the metal = 65°C

Mass of water = 100.0 g

Temperature of the water = 20.0°C

Final temperature of the water = 22.3 °C

The specific heat of water is 4.184 J/g°C

Step 2: Calculate the specific heat of metal

Qlost = -Qgained

Q= m xCxΔT

Qmetal = -Qwater

m(metal) x c(metal) x ΔT(metal) = - m(water) x c(water) x ΔT(water

⇒m(metal) = the mass of metal = 75.0 g

⇒c(metal) = the specific heat of the metal = ?

⇒ΔT = The change of temperature = 22.3 - 65°C = -42.7 °C

⇒m(water) = the mass of water = 100.0 g grams

⇒c(water) = the specific heat of water = 4.186 J/g°C

⇒ΔT(water) = T2 - T1 = 22.3 - 20.0 = 2.3 °C

75.0 g x c(metal) x -42.7 °C= -100.0 g x  4.186 x 2.3

75.0 g x c(metal) x -42.7 °C = −962.78

c(metal) = 0.3006338798J/g°C =0.30J/g°C

The specific heat of the metal is 0.30J/g°C.

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Answer:

1)NUCLEUS -> It is the center of an atom which contain protons and neutrons

SHELL-> the space where the probability of finding electrons is maximum in the atom is known as shell

there are mainly four shells KLMN

2)NUCLEUS->The average potential of Nuclei is different from that of an atom.

SHELL -> The average Potential varies.

3)NUCLEUS ->Particles of the shell structure of nuclei are neutrons and protons

SHELL->Particles of the shell structure of an atom are electrons

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The  given statement " about \(Co_{2}\),  Its accumulation in the blood is associated with a decrease in pH" is false  because Carbon dioxide (CO2) is a normal byproduct of metabolism. Its concentration in the blood is actually increased when \(Co_{2}\) accumulates. This accumulation of CO2 causes an increase in the acidity of the blood, which leads to an increase in the pH of the blood.

The \(Co_{2}\)  is then released as a gas, which causes the pH of the blood to decrease back to its normal range. Hyperventilation can lower the concentration of  in the blood by blowing off the \(Co_{2}\) that has been released as a gas. This increases the pH of the blood and can be dangerous if done excessively. More \(Co_{2}\) dissolves in the blood plasma than is carried in the red blood cells (RBCs).

\(Co_{2}\) is dissolved in the blood plasma and is then transported by the RBCs to the lungs where it is exhaled.\(Co_{2}\) concentrations are greater in venous blood than arterial blood because the venous blood has traveled from the tissues where the \(Co_{2}\) has been released from the cells, whereas the arterial blood has not yet traveled through the tissues. The arterial blood has higher oxygen concentrations, but lower \(Co_{2}\) concentrations.

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Answer:

27

Explanation:

Answer:

H2SO4 + 2NaNO2 → HNO2 + Na2SO4

The balanced equation for the breakdown of sulfuric acid and sodium nitrate is:

H2SO4 + 2NaNO2 -> HNO2 + Na2SO4

This equation shows that for every one molecule of sulfuric acid (H2SO4), two molecules of sodium nitrate (NaNO2) are required to produce one molecule of nitrous acid (HNO2) and one molecule of sodium sulfate (Na2SO4).

In terms of mass, the equation shows that for every 588 grams of sulfuric acid, 828 grams of sodium nitrate are required to produce 564 grams of nitrous acid and 384 grams of sodium sulfate.

Equilibrium concentration of NO  is 0.123 M

Equilibrium concentration of \(N_{2}\)  is 0.017 M

Equilibrium concentration of \(O_{2}\) is   0.017 M

We know that;

Kp = [\(N_{2}\)]. [\(O_{2}\)]/\([NO]^2\)

\(2.4 * 10^-3 = x^2/0.14 - x\\2.4 * 10^-3 (0.14 - x) = x^2\\3.36* 10^-4 - 2.4 * 10^-3x = x^2\\x^2 + 2.4 * 10^-3x - 3.36* 10^-4= 0\)

x = 0.017 M

Then

Equilibrium concentration of NO = 0.140 M - 0.017 M = 0.123 M

Equilibrium concentration of \(N_{2}\) = 0.017 M

Equilibrium concentration of \(O_{2}\) =  0.017 M

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Answer:

\(\boxed {\boxed {\sf About \ 2.96 \ moles \ of \ Argon}}\)

Explanation:

To convert from grams to moles we must use the molar mass, which is found on the Periodic Table.

Use the molar mass as a ratio.

\(\frac{39.9 \ g \ Ar}{1 \ mol \ Ar}\)

Multiply by the given number of grams: 118

\(118 \ g \ Ar *\frac{39.9 \ g \ Ar}{1 \ mol \ Ar}\)

Flip the fraction so the grams of argon will cancel each other out.

\(118 \ g\ Ar * \frac{1 \ mol \ Ar}{39.9 \ g \ Ar}\)

\(118 * \frac{ 1 \ mol \ Ar}{39.9 \ g \ Ar}\)

\(\frac {118 \ mol \ Ar }{ 39.9 }\)

\(2.95739348 \ mol \ Ar\)

The original measurement of grams had 3 significant figures, so our answer must have 3 sig figs.

For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 5 to a 6.

\(2.96 \ mol \ Ar\)

There are about 2.96 moles of Argon in 118 grams.

Answer:

it should be  0-0

Explanation:

If you originally had 200 g of substance A , 50 g of reactant have left after 4 half - lives .

At four half life  the fraction remaining of a substance is 1/16 or 0.25 of initial concentration and percentage remaining is 25 % .

So , If you originally had 200 g of substance A is present then amount of reactant  left after 4 half-lives = 200 g × 0.25 = 50 g .

Example of half - life is given below ,

Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half. For instance, if a sample contained 100g of Cf-251 at some point, there would still be 50g of Cf-251 after 800 years. There would only be 25g left after an additional 800 years (a total of 1600 years).

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When a Lewis acid and a Lewis base combine, the product may be referred to as an adduct.

An adduct is a chemical species that is formed when a Lewis acid and a Lewis base combine through a coordinate covalent bond. In this reaction, the Lewis base donates a pair of electrons to the Lewis acid, which accepts the electrons. This results in the formation of a new molecule, called an adduct, which contains a new covalent bond.

An example of an adduct is the reaction between boron trifluoride (BF3) and ammonia (NH3) to form boron trifluoride ammonia complex (BF3•NH3), which is an adduct.

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When CH₃CH₂CH₂CH₂OH undergoes alpha cleavage (See Pic2), the major fragment produced is CH₃CH₂CH₂CH₂.

The act of disassembling a molecule's molecular structure into smaller parts or fragments is referred to as fragmentation. Chemical processes, collision-induced dissociation, and photodissociation are just a few of the mechanisms that might cause this. By causing molecular ion fragmentation and examining the resultant fragments, fragmentation is a frequently used technique in mass spectrometry to ascertain the structure of a molecule. The distribution and intensity of the fragments can reveal crucial details about the chemistry and make-up of the original molecule.

By eliminating the alpha carbon and the hydrogen that is connected to it, alpha cleavage causes the carbonyl carbon and the beta carbon to establish a new carbon-carbon bond.

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The complete question is:

Provide the structure of the major fragment that results when the molecular ion of ch3ch2ch2ch2oh undergoes fragmentation via alpha cleavage (See Pic1).

1) I

2) II

3) III

4) IV

5) V

Answer

A reaction generally can be made to go more quickly by:

B. Adding a catalyst

C. Lowering the activation energy

D. Shaking the reactants

Explanation

The presence of a catalyst increases the rate of a reaction by lowering its activation energy. Chemical reactions occur when molecules collide with each other and undergo a chemical transformation.

Stirring and shaking provide some kinetic energy to the system. It increases slightly its temperature and the reaction rate. increasing the kinetic energy of reactant particles also means more of the reactant particles will have the minimum amount of energy required to form products (ie, activation energy) which leads to more successful collisions and therefore increases the reaction rate.

Answer:

D) a redox reaction to produce electricity

Explanation:

Electrolytic cell and chemical cells are the two types of electrochemical cells there is. Electrochemical cells are devices that interconvert electrical eneegy and chemical energy. Electrolytic cells are cells that induce chemical reactions when an electric current passes through them i.e. they need electric energy to generate chemical energy.

On the other hand, chemical cells generate electrical energy by undergoing chemical reactions involving oxidation and reduction of ions i.e. redox reaction. The chemical cell uses the energy that results from undergoing a redox reaction to generate electricity.

Answer:

well dont hurt yourself

Explanation:

its not very good to

Answer:

True

Explanation:

Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage.

For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water which bypasses the conversion to liquid stage and goes straight to the gaseous form.

Answer:

Explanation:

As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite.

Answer: it is A .

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Explanation:Be is not multivalent

Answer:

20 atoms total

Explanation:

N (3) + H (12) + P (1) + O(4) = 20 atoms

If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be positive.

This is defined as the energy used by a substance involved in a chemical reaction.

The Gibbs free energy and entropy has a direct relationship which is why a positive gibbs free energy will result in a corresponding positive entropy.

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Answer: The correct answer is Negative

Option (b) 3H₂ + N₂ → 2NH₃ is the chemical reaction that is balance among the following.

A balanced chemical reaction is one in which both sides of the equation have an equal amount of atoms of each element, i.e., the mass of the reactants and products are equal, like 2Mg+O₂ → 2MgO. The symbols or formulas in a chemical equation must be balanced by adding coefficients as necessary so that the same number of each type of atom appears in the reactants and products.

When comparing the number of atoms of each element on the two sides of a reaction, a chemical equation is always balanced. Balancing a chemical equation is crucial for understanding a chemical reaction. This is so that it can reveal the number of moles that are reacting and generating. Additionally, it indicates the number of electrons transferred from one compound to another. 

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If the volume is decreased to 2.6 L and pressure is decreased to 3.2 atm, then temperature become 156.98K.

This problem can be solved by using the concept of Ideal gas equation.

The equation of ideal gas can be expressed as

PV = nRT

where,

P is the pressure of the gas

V is the volume taken

n is the number of moles of the gas

R is the gas constant = 6.314 J/ mol K

T is the temperature

Now from given data, we have the values of

V = 3.2 L

P = 5.5 atm

T = 53°C = 273 + 53 = 326 K

By substituting all the values, we get the value of n

3.2 × 5.5 = n × 6.314 × 326

17.6 = n × 2058.36

n = 17.6 / 2058.36

n = 0.0085 mol

Now, we have to find the temperature

n = 0.0085 mol

V = 2.6 L

P = 3.2 atm

By substituting all the values, we get

3.2 × 2.6 = 0.0085 × 6.314 × T

8.32 = 0.053 T

T = 8.32/ 0.053

T = 156.98 K

Thus, we concluded that if the volume is decreased to 2.6 L and pressure is decreased to 3.2 atm, then temperature become 156.98K.

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Answer:

letter B is the answer

Explanation:

just take a look at the atoms

Answer:

B.) Only elements have one kind of atom.

Explanation:

An element consists of only one type of atom, while a compound consists of two or more types of elements