Benzoic acid, ch3cooh, is a weak acid with ka = 6.3 10-5.


ch3co,h(aq) + h2o(1) = h2o+(aq) + ch3co2 (aq)


1. calculate the ph of a 0.150 m benzoic acid solution. show all calculations.

In order to reduce the risk of radiation exposure to individuals and environmental contamination, radioactive wastes are kept. The wastes' radioactivity decreases over time.

Large steel and concrete barrels that contain the garbage are typically properly sealed, although accidents and leaks can still happen. Cancerous growths can result from the severe negative impacts of nuclear waste on life.

Currently, dry casks are used to store all of the nuclear waste that a power plant produces over the course of its lifetime. Since 1987, Yucca Mountain in Nevada has been intended as a permanent disposal location for spent nuclear material.

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In fluorescence spectroscopy, the wavelength of the emitted radiation is longer than the wavelength of the radiation used for excitation of the analyte because during excitation, the analyte absorbs energy and moves to a higher energy state.

This excited state is unstable and the analyte returns to its ground state by releasing the excess energy as a photon of lower energy, which corresponds to a longer wavelength. This phenomenon is known as Stokes' shift and is a fundamental property of fluorescence. The Stokes' shift is useful in identifying and characterizing analytes, as it provides information on their energy states and structures.

This shift occurs because the analyte undergoes a non-radiative relaxation process called internal conversion, which causes a loss of some energy before fluorescence emission. As a result, the emitted radiation has lower energy and longer wavelength compared to the excitation radiation.

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Answer:

0.898 moles

Explanation:

In order to solve this, we need the gas constant:

gas constant: R=0.082057338 L atm K^(-1) mol^(-1)

p = pressure = 1.34 atm

v = 15.4 L

t = temperature = 280K

pv / (Rt) =

\(\frac{1.34 atm * 15.4 L}{0.082057338 Latm K^{-1}mol^{-1} * 280K}\) =  ==> substitute known values

\(\frac{20.636}{0.082057338 * 280}\) =  ==> simplify

\(\frac{20.636}{22.976}\) =0.898 moles

The transition state is the structure in a reaction with the highest potential energy.

Option C is correct.

In a synthetic response, a change state is a transitional stage among reactants and items. A temporary arrangement of atoms at the reaction's potential energy barrier is known as a transition state. The activation energy of the reaction is determined by the amount of energy required to cross the potential energy barrier.

The energy of a reaction changes as the reaction progresses and the reactants are transformed into products.

The process by which atoms are rearranged to produce one or more distinct substances is known as a chemical reaction. Changes that can be seen include the production of heat and light, the formation of gas bubbles, and color shifts in the reactants during chemical reactions. In synthetic responses, molecules revise, bond, or fall to pieces.

The reactants are the atoms in the reaction's initial state, and the products are the atoms in the reaction's final state. Through the formation and breaking of chemical bonds, the reactants become the products. The equilibrium of a reaction is always maintained, which means that both sides of the equation have the same number of atoms.

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The statement "You will have enough gas" is true.

The ideal gas law provides a relationship between pressure (P), volume (V), temperature (T), and the number of moles of gas (n). T

he relationship is given by PV = nRT, where R is the gas constant, which has a value of 8.31 L-kPa/mol-K.

To use this equation, the conditions under which the gas is being measured must be specified.The gas in question is given as having a volume of 25.0 L, a pressure of 101.5 kPa, and a temperature of 373 K.

At STP (Standard Temperature and Pressure), the temperature and pressure are 273 K and 101.3 kPa, respectively. To use this information, we need to calculate the number of moles of gas we have, and then compare that value to the number of moles needed for the reaction.

The equation PV = nRT can be rearranged to solve for n. Dividing both sides by RT, we get:n = PV/RTSubstituting the given values, we obtain:n = (101.5 kPa)(25.0 L) / (8.31 L-kPa/mol-K)(373 K)n = 7.55 mol

The volume of gas required for the reaction is 22.4 L at STP.

To convert this to the conditions we have, we must adjust for the pressure and temperature. The pressure ratio is:

101.5 kPa / 101.3 kPa = 1.00197

The volume ratio is:

273 K / 373 K = 0.73193

Multiplying the ratios gives the conversion factor:

1.00197 × 0.73193 = 0.7332

This means that 22.4 L of gas at STP would occupy 0.7332 × 22.4 L = 16.4 L at 101.5 kPa and 373 K.

The number of moles of gas required for the reaction is:

n = PV/RTn = (101.5 kPa)(16.4 L) / (8.31 L-kPa/mol-K)(373 K)n = 4.89 mol

The amount of gas we have is 7.55 mol, which is greater than the 4.89 mol needed for the reaction.

Hence, the statement "You will have an adequate amount of gas" is accurate.

The question should be:

A reaction requires 22.4 L of gas at STP. You have 25.0 L of gas at 101.5 kPa and 373 K. Which of the following statements is true? (Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K.)

You will have enough gas

You will have excess gas

You do not have enough gas

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The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer:

The equilibrium concentration of chlorine gas, Cl₂(g), is 0.0625 M

Explanation:

Chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed, so that no changes are observed as time passes, despite the fact that the substances present continue to react with each other.

The mathematical expression that represents Chemical Equilibrium is known as the Law of Mass Action and is stated as: The ratio of the product of high concentrations to the stoichiometric coefficients in the reaction of products and reactants remains constant at equilibrium. For any reaction:

aA + bB ⇄ cC + dD

the equilibrium constant Kc is calculated as:

\(Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b}}\)

In this case, you have:

2 ICl(g) → Cl₂(g) + I₂(g)

So, the equilibrium constant Kc is:

\(Kc=\frac{[Cl_{2} ]*[I_{2} ]}{[ICl]^{2} }\)

Being:

Replacing:

\(0.1=\frac{[Cl_{2} ]*0.40 M}{(0.50 M)^{2} }\)

Solving:

\(0.1=\frac{[Cl_{2} ]*0.40 M}{0.25 M^{2} }\)

0.1= 1.6 \(\frac{1}{M}\)* [Cl₂]

[Cl₂]= 0.1 ÷ 1.6 \(\frac{1}{M}\)

[Cl₂]= 0.0625 M

The equilibrium concentration of chlorine gas, Cl₂(g), is 0.0625 M

The equilibrium concentration of chlorine gas, if the equilibrium concentrations of ICl(g) and I₂(g) are known to be 0.50 M and 0.40 M respectively is 0.0625M.

Equilibrium constant for any reaction will be define as the ratio of the concentration of products to the concentration of reactants with raise to their respective coefficients.

Given chemical reaction is:

2ICl(g) → Cl₂(g) + I₂(g)

Equilibrium constant for this reaction will be calculated as:

Kc = [Cl₂][I₂] / [ICl]², where

Kc = equilibrium constant = 0.10

[I₂] = concentration of iodine gas = 0.40 M

[ICl]² = concentration of ICl = 0.50 M = (0.50M)² = 0.25M²

[Cl₂] = concentration of chlorine gas = to find?

On putting all these values on the above equation and calculate for the value of [Cl₂] as follow:
[Cl₂] = Kc × [ICl]² / [I₂]

[Cl₂] = (0.10)(0.25) / (0.40)

[Cl₂] = 0.0625M

Hence, equilibrium concentration of chlorine gas is 0.0625M.

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The statement about atoms that is FALSE from the following options is: B) Atoms are responsible for the sensation of smell.

What is an atom?

An atom is the smallest possible unit of matter that retains the chemical and physical characteristics of a component. Each element is made up of a unique kind of atom that has the same number of protons in its nucleus. In the periodic table, elements are arranged by atomic number.The following are the given options:A) Atoms compose all matter.B) Atoms are responsible for the sensation of smell.C) Atoms are the basic building block of nature.D) An atom is the smallest identifiable unit of an element.E) All of the above statements are true.Out of these given options, B) Atoms are responsible for the sensation of smell is the FALSE statement. The sensation of smell is produced by olfactory receptors in the nasal cavity, which are stimulated by molecules of various shapes and sizes.

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Answer:

2 moles of hydrogen gas reacts with 1 mole of oxygen gas to yield 2 moles of water. 4 grams of hydrogen gas reacts with 32 grams of oxygen gas to yield 36 grams of water. Oxygen gas is insufficient since it is only 4 grams. This means that all oxygen gas will react to a proportionate amount of hydrogen to form water.

Explanation:

BORK BORK Hope this helps <3

CAN I HAVE BEPIS

The physical property of the mineral is often misleading when trying to identify the mineral is the correct option is a) color.

The Color is the least useful physical property for the identification of the mineral, because the same type of mineral can be found in the several different colors due to the impurities in the mineral. The Color is rarely very helpful  for identifying the mineral. A mineral is the naturally occurring  element or the compound and having an ordered structure.

The Color should be considered as we identifying the mineral, but it should not be used as the major component  as identifying characteristic.

This question is incomplete, the complete question is :

what physical property of a mineral is often misleading when trying to identify a mineral? group of answer choices :

a) color

b) hardness

c) cleavage

d) all of the above

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To find the density of the unknown gas, we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure (in atm)

V = Volume (in L)

n = Number of moles

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature (in K)

We are given:

Molar mass of the gas (M) = 44.01 g/mol

Pressure (P) = 0.852 atm

Temperature (T) = 77.8 °C = 77.8 + 273.15 = 350.95 K

First, we need to calculate the number of moles (n) of the gas using the molar mass and the ideal gas equation:

n = m/M

where:

m = mass of the gas

Since the mass is not given, we cannot directly calculate the density. Therefore, without the mass of the gas, we cannot determine its density. None of the options provided in the question match the correct density value since we cannot perform the calculation.

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Find the density of an unknown gas (in g/L), which has a molar mass of 44.01 g/mol, with an ambient air pressure of 0.852 atm at 77.8 oC.

Question 18 options:

1.835

0.740

1.263

1.426

1.302

Answer:2, 7, 4, 6

Explanation:

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Answer: ahem...

Explanation: 1. True 2. reproducing 3. All of them 4. i would say true, the only thing is plants dont really digest food and it says "all" organisms... 5. B, C, and D...A is more of defense and not really "maintaining structure"

Extinct

When all of the members of species die out it is called extinct

Answer:

Explanation:

The space between the large nucleus and the electrons is huge. We know this because the alpha particles shot at the gold foil most went right on through. That means that the space between hold atoms is very large.

B

Not only that but the deflection that takes place is not frequent further telling us that the the nucleus must be positively charged. That observation comes from the deflection itself. The charge on the nucleus must be the same as the alpha particle. If they were different, and the nucleus was negative, those particles that were deflected would now be absorbed.

At 25.0°C, the osmotic pressure of a solution made from 22.3 g of methanol (MM = 32.04 g/mol) that was added to 681 mL of water is 0.224 atm.

The osmotic pressure of a solution is the minimum pressure required to prevent the solvent molecules from moving into the solution via osmosis. Osmotic pressure is determined by the concentration of the solute in the solution, which can be determined using a formula for osmotic pressure.

To calculate the osmotic pressure, first, we need to calculate the molarity of the methanol solution:
Molarity = (22.3 g methanol / 32.04 g/mol methanol) / (681 mL / 1000 mL/L)

= 0.077 mol/L

Then, using the Van’t Hoff equation, we can calculate the osmotic pressure of the solution:

Osmotic Pressure = i × M × R × T

i = number of ions (1 for non-ionized molecules)

M = molarity (0.077 mol/L)

R = ideal gas constant (0.08206 L atm/K mol)

T = temperature in Kelvin (25.0°C + 273.15 = 298.15 K)

Osmotic Pressure = 0.077 × 0.08206 × 298.15

= 0.224 atm

Thus, the osmotic pressure, in atm, of a solution made from 22.3 g of methanol (MM = 32.04 g/mol) that was added to water to make 681 mL of solution at 25.0 °C is 0.224 atm.

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Answer:

The SAE curriculum includes practical farming tasks conducted outside the scheduled classroom and laboratory period by students. SAEs offer a method for students in agricultural education to gain real-world work opportunities that they are most interested in in the field of agriculture. Supervised agricultural experience is an essential component of agricultural education, and all Agriculture, Food and Natural Resources (AFNR) courses are a necessary component.

Explanation: Hope it helps

Explanation:

The basic concepts behind Organic farming are: ... Control of pests, diseases, and weeds is achieved largely by the development of an ecological balance within the system and by the use of bio-pesticides and various cultural techniques such as crop rotation, mixed cropping, and cultivation.

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Answer:

True

Explanation:

This is known as a lapse rate. When you shout something to someone across the lake, the sound waves near the surface end up moving faster than the sound waves higher up. Since the speed is greatest near the ground, sound waves bend upward, causing the audio to be just out of ears reach.

The half-life of the reaction at 36°C is 19.2 seconds.

We can use the following equation to determine the  half-life of the reaction at 36°C;

\(t_{1/2}\) = ln(2) / k

where \(t_{1/2}\) is the half-life of the reaction and k is the reaction rate constant at the given temperature.

First, we need to find the reaction rate constant at 36°C. We can use the two rate constants given for 30°C and 42°C and the Arrhenius equation;

ln(k₂/k₁) = (-Ea/R) × (1/T₂ - 1/T₁)

where k₁ and k₂ are the rate constants at temperatures T₁ and T₂, Ea will be the activation energy, R is gas constant, and T is temperature in Kelvin.

We can choose 30°C (303 K) as T₁ and 42°C (315 K) as T₂, and solve for ln(k₂/k₁) to get;

ln(k₂/k₁) = (-Ea/R) × (1/T₂ - 1/T₁)

ln(0.0608/0.0202) = (-Ea/8.314 J/(mol×K)) × (1/315 K - 1/303 K)

Ea ≈ 52.7 kJ/mol

Next, we can use the Arrhenius equation to find the rate constant at 36°C (309 K);

k = A × exp(-Ea/RT)

k = 0.0202 s⁻¹ × exp(-52.7 kJ/mol / (8.314 J/(mol×K) × 309 K))

k ≈ 0.036 s⁻¹

Finally, we can use the half-life equation with this rate constant to find the half-life at 36°C;

\(t_{1/2}\)= ln(2) / k

\(t_{1/2}\) = ln(2) / 0.036 s⁻¹

\(t_{1/2}\) ≈ 19.2 s

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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:

because battery have it's own voltage in it's composition

An atom Y has atomic number 13, so the no. of electrons and protons in it is 13 and after loses it will form cation and no. of electrons will become 10.

Atomic number of an atom is equal to the number of electrons or protons present in that atom.

Number of protons and electrons in the atom before loses electron is 13, as given atomic number is 13.

Number of elctrons in the atom is 10 and number of protons is 13, as protons are present in the nucleus.

So, number of protons is always same i.e. 13 within the atom and no. of electrons after losing 3 electrons is 10.

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It is expected that mercury would have a molten interior based on its small size, rapid rotation, and density. Mercury is one of the four inner planets in our solar system.

It is the smallest planet in our solar system and the one closest to the Sun. Mercury's diameter is just 40% of the Earth's diameter, making it the smallest planet in our solar system. It has a rocky surface that is heavily cratered and has numerous cliffs. Additionally, Mercury has a molten core that accounts for roughly 85 percent of its volume.Mercury's rapid rotation and density suggest that it has a molten interior. Mercury rotates three times on its axis for every two times it orbits the Sun.

This leads to a considerable amount of friction that warms the interior of the planet. Mercury's density is also quite high, indicating that the planet's interior is made up of metals such as iron, nickel, and sulfur, which have relatively high melting points. As a result, the planet's core is assumed to be molten.The above mentioned facts lead to the conclusion that Mercury would have a molten interior.

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Answer: Revoke the driver's license for at least 12 months

Explanation:

Chemical tests are used in order to measure the amount of drugs or alcohol that is in the body of a person when the person was arrested. To do this, samples of the urine or blood of the person can be taken and the result will be used to know if the person was driving under the influence of alcohol or not.

If the person refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to revoke the the driver's license of the person for at least 12 months.

Answer:

Electronic configurations of three magnesium atoms and two nitrogen atoms.

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