Calculate the
pH of the acetate buffer CH3COOH + CH3COONa, containing 0.01 of each of the compound. Ka= 1.8×10^-5​

Answer:

6

What do AIA, SAG, AFP and AMA all stand for? Select four options.

American Institute of Architects

American Society of Mechanical Engineers

American Medical Association

Screen Actors Guild

Association for Finance Professionals

Professional Colleges

The stoichiometric ratio of chlorine feed to ammonia feed for combined chlorination is 1:2.

To calculate the stoichiometric ratio of chlorine feed to ammonia feed for combined chlorination, we need to consider the balanced chemical equation for the reaction that forms dichloramine.

The balanced equation for the reaction between chlorine (Cl₂) and ammonia (NH3) to form dichloramine (NH₂Cl) is:

Cl₂ + 2 NH₃ -> 2 NH₂Cl

From the balanced equation, we can see that the stoichiometric ratio of chlorine to ammonia is 1:2.

This means that for every 1 mole of chlorine, we need 2 moles of ammonia to react completely and form 2 moles of dichlorine.

The term "stoichiometric" refers to the balanced and exact proportions in which reactants combine and products form in a chemical reaction.

It describes the ideal or theoretical ratio of reactants required for a complete reaction based on the stoichiometry, which is determined by the balanced chemical equation.

In a stoichiometric reaction, the amount of each reactant is precisely balanced so that all reactants are consumed, and the maximum amount of products is formed.

The stoichiometric ratio is determined by the coefficients of the balanced equation, indicating the number of moles or molecules of each reactant and product involved.

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In this problem, we need to find the pH of a buffer (pH = 4.45) that is produced by the reaction of strong acids as HBr that reacts with weak bases as NaC₇H₅O₂ producing its weak acid and a salt, as follows:

HBr + NaC₇H₅O₂ → HC₇H₅O₂ + NaBr

If in the reaction, the limiting reactant is the strong acid, we will produce a buffer (The aqueous mixture of a weak acid and its strong base).

Using Henderson-Hasselbalch equation, we can find the pH of this buffer:

\(pH = pKa + log \frac{[NaC_7H_5O_2]}{[HC_7H_5O_2]}\)

Where:

pKa is -log Ka = 4.20

[] could be taken as the moles of each species

After the reaction, the moles of HBr = Moles of HC₇H₅O₂ and the remaining moles of NaC₇H₅O₂ = Initial moles of NaC₇H₅O₂ - Moles of HBr.

Moles HBr:

22.5mL = 0.0225L * (0.200mol/L) = 4.5x10⁻³ moles HBr

Moles NaC₇H₅O₂:

50.0mL = 0.0500L * (0.250mol/L) = 0.0125 moles NaC₇H₅O₂

That means the moles after the reaction of the species of the buffer are:

Moles HC₇H₅O₂ = Moles HBr = 4.5x10⁻³ moles

Moles NaC₇H₅O₂ = 0.0125 moles - 4.5x10⁻³ moles = 8.0x10⁻³ moles

Replacing in H-H equation:

\(pH = 4.20+ log \frac{[8.0x10^{-3}]}{[4.5x10^{-3}]}\)

pH = 4.45

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A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. (1) Since it is given that the white gold is having a uniform composition throughout.So,it means this is a Homogeneous mixtures.

Since most chemical reactions that must be done within a living cell would happen very slowly, too slowly for the cell to stay alive, cells use chemicals called enzymes to speed up almost all chemical reactions in a living thing.

Enzymes are proteins that are responsible for controlling chemical reactions in the body. They are critical to human life because they help to regulate the vast array of chemical reactions that occur in the body. Enzymes catalyze a wide range of reactions and play a critical role in the metabolism of cells. They are involved in almost every aspect of cell metabolism and are essential for the survival of cells. There are various types of enzymes, and each type of enzyme is specific to the reaction it catalyzes.

The enzymes' catalytic properties are due to their unique 3D structure, which is formed by the arrangement of the amino acids that make up the enzyme's protein chain.The rate of reaction depends on the availability of substrates, the temperature, and the pH. Enzymes are also affected by the concentration of the product and the substrate they catalyze. In general, enzymes speed up chemical reactions by lowering the activation energy required for the reaction to occur.

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Answer:

B.

Explanation:

Rust is a chemical change because you can not undo it. Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.

Verify that the number of atoms of each element is equal on both sides of the equation and, if the equation contains ions, that the charges are balanced equation.

The number and type of each atom in balanced chemical equations are the same on both sides of the equation. The simplest whole number ratio must be used as the coefficients in a balanced equation. In chemical processes, mass is always preserved.

Each element must have the same number of atoms on the left as it has on the right. You must add integers to the left of one or more equations to balance an imbalanced equation.

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1 meter = 1000 km

2500 meter = 2500/1000 km

= 2.5 km

Answer:

20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

Explanation:

A mole contains 6.022 x 10^23 atoms, which is also known as Avogadro's number, and this number is same for each element. So, there are 20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

The number of atoms are there in 20 moles of calcium is 120.4 × 10²³.

Avogadro's number is the number which is equal to the number of atoms of any substance that are present in one mole of that substance, and it is equal to 6.022 × 10²³.

Given moles of calcium = 20 moles

So, number of atoms in given moles of calcium will be calculated as:
No. of Ca in 20 mol = 20mol × 6.022 × 10²³ atoms/mol = 120.4 × 10²³ atoms

Hence required atoms of calcium is 120.4 × 10²³.

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For the pH after the addition of each volume of acid, we need to consider the reaction between methylamine (CH₃NH₂) and HNO₃. Methylamine is a weak base, and HNO3 is a strong acid. The reaction can be written as:

CH₃NH₂ + HNO₃ -> CH₃NH₃+ + NO₃-

First, let's calculate the initial moles of methylamine in the 100.0 ml sample:

moles CH₃NH₂ = volume (L) * concentration (mol/L)

moles CH₃NH₂ = 0.100 L * 0.100 mol/L

moles CH₃NH₂ = 0.010 mol

Since CH₃NH₂ is a weak base, it will react with HNO₃ in a 1:1 ratio. Therefore, the number of moles of CH₃NH₂ reacting will be equal to the number of moles of HNO₃ added.

Now let's calculate the moles of HNO₃ added for each case:

a) 0.0 ml (no HNO₃ added): 0.010 mol

b) 20.0 ml: moles HNO₃ = 0.020 L * 0.250 mol/L = 0.005 mol

c) 40.0 ml: moles HNO₃ = 0.040 L * 0.250 mol/L = 0.010 mol

d) 60.0 ml: moles HNO₃ = 0.060 L * 0.250 mol/L = 0.015 mol

Now we need to calculate the moles of CH₃NH₂ and CH₃NH₃+ remaining after the reaction.

For case a) 0.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.000 mol = 0.010 mol

moles CH₃NH₃+ formed = 0.000 mol

For case b) 20.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.005 mol = 0.005 mol

moles CH₃NH₃+ formed = 0.005 mol

For case c) 40.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.010 mol = 0.000 mol

moles CH₃NH₃+ formed = 0.010 mol

For case d) 60.0 ml:

moles CH₃NH₂ remaining = 0.010 mol - 0.015 mol = -0.005 mol (Excess acid)

moles CH₃NH₃₊ formed = 0.015 mol

Since methylamine is a weak base, we need to consider the Kb value to calculate the concentration of hydroxide ions (OH-) and then convert it to pH.

The Kb expression for methylamine is:

Kb = [CH₃NH₃+][OH-] / [CH₃NH₂]

We can assume that [OH-] ≈ [CH₃NH₃+], so the equation becomes:

Kb = [OH-]^2 / [CH₃NH₂]

Rearranging the equation:

[OH-] = sqrt(Kb * [CH₃NH₂])

Now, let's calculate the OH- concentration and convert it to pH for each case:

a) 0.0 ml:

[OH-] = sqrt(3.7x10^-4 * 0.010 mol) ≈ 0.00608 M

pOH = -log10(0.00608) ≈ 2.22

pH = 14

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The pH of the resulting solution is approximately 4.3. To calculate the pH of the resulting solution, we need to use the equation for pH: pH = -log[H⁺]

First, let's calculate the number of moles of HCl that are present in the solution. We can use the formula:

moles = concentration * volume

Concentration of HCl = 1.0 M
Volume of HCl = 0.05 mL

= 0.05 * 10⁻³  L

= 5 * 10⁻⁵ L

moles of HCl = 1.0 M * 5 * 10⁻⁵ L

= 5 * 10⁻⁵ moles

Now, let's calculate the total volume of the resulting solution:

Total volume = 0.05 mL + 999.95 mL

= 1000 mL

= 1000 * 10⁻³ L

= 1 L

To calculate the concentration of H⁺ ions in the solution, we divide the moles of HCl by the total volume:

[H⁺] = moles of HCl / total volume

[H⁺] = 5 * 10⁻⁵ moles / 1 L

= 5 * 10⁻⁵ M

Finally, we can calculate the pH using the equation:

pH = -log[H⁺]

pH = -log(5 * 10⁻⁵)

= -(-4.3)

= 4.3

Therefore, the pH of the resulting solution is approximately 4.3.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

C. A down-filled coat via a p e x

Thermal insulation maintains the temperature inside the system and inhibits heat transfer. A down-filled coat would have the best thermal insulation properties. Thus, option C is correct.

Thermal insulation is the property of the substance to resist the heat and energy transfer from a substance of abundance to a lesser concentration. They lack the conducting particles.

It inhibits the heat to get transferred to other substances. The minimum heat transfer is achieved by the structural formation and the choice of the substance.

A down-filled coat is made of insulation material that keeps warm during the winters as its structure can trap and retain heat making the person warm during colds.

Therefore, option C. A down-filled coat best shows thermal insulation.

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This shows that you have insufficient moles of silver nitrate to allow for all the moles of sodium chloride to react → silver nitrate is a limiting reagent.

According to the balanced chemical equation's coefficients, 2 moles of silver (I) nitrate and 1 mole of copper combine to generate 2 moles of silver. is the limiting reactant, as silver (I) nitrate produces fewer moles of silver.

We can determine the theoretical quantity of silver chloride that can be created from one mole of silver nitrate using the molar ratios in the balancing equation:

1 mole silver nitrite x (1 mole silver chloride / 1 mole silver nitrite) = 1 mole silver chloride

In a similar manner, we may determine how much silver chloride, theoretically, can be created from 0.8 moles of sodium chloride:

0.8 mole sodium chloride x (1 mole silver chloride / 1 mole sodium chloride) = 0.8 mole silver chloride

Sodium chloride is the limiting reactant because the predicted yield of silver chloride is smaller for sodium chloride (0.8 mole) than for silver nitrate (1 mole).

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Answer: electrostatic force

Explanation:

Oppositely charged particles attract each other. This attractive force is often referred to as an electrostatic force. An ionic bond is the electrostatic force that holds ions together in an ionic compound

Answer:

D, when there is a large antelope population

Explanation:

I took the k12 test and got it right

The amount of heat that is needed to change 250.0 grams of water at 80°C to steam at 100°C is 20900 J of heat.

Heat change is the amount of heat that must be added or that is evolved when a particular change occurs in a substance.

The amount of heat required is determined from the formula of heat given below as follows:

Heat change = mass * specific heat capacity * temperature change

Heat required = 250 * 4.18 * (100 - 80)

Hee=at required = 20900 J

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To determine the mass of PCI3 formed in the reaction, we need to calculate the molar mass of P4CI2 and then use stoichiometry to find the molar ratio between P4CI2 and PCI3. From there, we can calculate the moles of PCI3 formed and convert it to grams using its molar mass. The mass of PCI3 formed in the reaction of 75.0 g of P4CI2 is approximately 104.9 g.

First, we need to calculate the molar mass of P4CI2. Phosphorus (P) has a molar mass of 31.0 g/mol, and chlorine (CI) has a molar mass of 35.5 g/mol. Since P4CI2 consists of four phosphorus atoms and two chlorine atoms, the molar mass of P4CI2 is (4 * 31.0 g/mol) + (2 * 35.5 g/mol) = 207.0 g/mol.

Next, we use stoichiometry to find the molar ratio between P4CI2 and PCI3. The balanced chemical equation for the reaction is: P4CI2 + 6CI2 -> 4PCI3. From the equation, we can see that for every 1 mole of P4CI2, 4 moles of PCI3 are formed.

To find the moles of PCI3 formed, we divide the given mass of P4CI2 (75.0 g) by its molar mass (207.0 g/mol): 75.0 g / 207.0 g/mol = 0.362 moles of P4CI2.

Using the molar ratio, we can calculate the moles of PCI3 formed: 0.362 moles of P4CI2 * (4 moles PCI3 / 1 mole P4CI2) = 1.448 moles of PCI3.

Finally, we convert the moles of PCI3 to grams by multiplying it by the molar mass of PCI3, which is 208.25 g/mol. The mass of PCI3 formed is: 1.448 moles of PCI3 * 208.25 g/mol = 301.4 g, rounded to 104.9 g. Therefore, approximately 104.9 g of PCI3 forms in the reaction of 75.0 g of P4CI2.

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What exposing potassium t-butoxide to air can cause is;

Lung damage when inhaled

Severe chemical burns when in contact with skin

Potassium t-butoxide is a colorless solid which is a strong base, which is useful in organic synthesis.

Potassium tert-butoxide catalyzes the reaction of hydrosilanes and heterocyclic compounds to give the silyl derivatives, with release of Hydrogen gas.

This potassium t-butoxide when exposed to the air can cause respiratory irritation in some persons.

The body's response to such irritation can cause further lung damage.

Inhaling corrosive bases may irritate the respiratory tract.

The symptoms include cough, choking, pain and damage to the mucous membrane.

Persons with impaired respiratory function, airway diseases and conditions such as emphysema or chronic bronchitis, may incur

further disability if excessive concentrations of particulate are inhaled.

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Answer:

dissolve

Explanation:

salt will dissolve in water while sand will not, so you arent going to see salt pass through

Answer:

b

Explanation:

For a liter of a buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate, and with a  result in a buffer pH of 4.01, the moles of HCl required is mathematically given as x=0.313mol

Generally, the equation for the pH   is mathematically given as

pH=pKa+logsalt/acid

Generally, the equation for the Chemical Reaction   is mathematically given as

HCl+CH3CooNa---->NaCl+CH3OOH

Therefore

4.01=4.74+log\frac{0.8-x}{1.3+x}

-0.52=log\frac{0.8-x}{1.3+x}

x=0.313mol

In conclusion, The moles of HCl required is

x=0.313mol

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Buffer is a solution that prevents pH variation in a solution when base or acid is added. In a liter of buffer 0.313 mol of hydrochloric acid must be added.

pH is the potential of hydrogen and is given as,

\(\rm pH =\rm pKa + log \dfrac{salt}{acid}\)

The chemical reaction is given as,

\(\rm HCl+CH_{3}COONa \rightarrow NaCl+CH_{3}OOH\)

Given,

pH =4.01

pKa = 4.74

Concentration of salt = 0.8 - x

Concentration of acid = 1.3 + x

Substituting values in the pH formula:

\(\begin{aligned} 4.01 &= 4.74 + \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\-0.52 &= \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\&= 0.313 \;\rm mol\end{aligned}\)

Therefore, 0.313 moles of HCl are needed.

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Combine with its sodium salt to make a solution buffered at ph 4.25 Formic acid.

Remember that the best range for a buffer is within 1 pH unit of the pKa. This eliminates hypochlorous acid and chlorous acid and then the closest to the desired 4.25 is chosen from the remaining nitrous acid and formic acid.

Use the HH equation to find the ratio of the conjugate base to the acid required to get pH 4.25. Set the desired pH into the equation along with the pKA and solve for the log(base/acid) and then put base 10 on everything to get rid of the log.

Within the Brønsted–Lowry definition of acids and bases, a conjugate acid–base pair includes two materials that differ simplest by way of the presence of a proton (H⁺). A conjugate acid is formed whilst a proton is delivered to a base, and a conjugate base is formed when a proton is removed from an acid.

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Answer:

C

Explanation:

Read it from my 8th grade text book a few years back.

Answer:

C   l i f e

Explanation:

Answer:

2,2-dimethylpropane : C5H12

becoz formula of propane is

C3H8

Answer:

191.11 grams of oxygen gas should be produced.

Explanation:

The balanced reaction is:

2 Al₂O₃ → 4 Al + 3 O₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Being the molar mass of each compound:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 108 grams of aluminum are produced along with 96 grams of oxygen, 215 grams of aluminum are produced along with how much mass of oxygen?

\(mass of oxygen=\frac{215 grams of aluminum*96 grams of oxygen}{108grams of aluminum}\)

mass of oxygen= 191.11 grams

191.11 grams of oxygen gas should be produced.

The correct balanced equation for hydrogen and oxygen reacting to form water is 2H₂ + O₂ ⇒ 2H₂O₂. Therefore, option B is correct.

Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically. Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations.

The left and right sides of the reaction arrow of a balanced equation have an equal number of each type of atom. The reactants and products are placed on the left and right sides of the arrow, respectively, to create a balanced equation.

Thus, The correct balanced equation for hydrogen and oxygen reacting to form water is 2H₂ + O₂ ⇒ 2H₂O₂. Therefore, option B is correct.

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im pretty sure its B

Explanation: also pretty sure we might be from the same class-

Por definición de porcentaje masa en masa, el porcentaje masa/masa de la solución es 20%.

En primer lugar, debes saber que una solución es una mezcla homogénea de dos o mas componentes, donde aquel que se encuentra en  mayor proporción se llama solvente y las demás sustancias se denominan solutos, que están disueltas en el disolvente.

La relación que existe entre la cantidad de soluto y la cantidad de disolvente recibe el nombre  de concentración.

Una de las unidades de concentración usadas es el porcentaje masa/masa. El porcentaje masa/masa (% m/m) indica la masa de soluto por masa de disolución. En otras palabras, el porcentaje en masa (o en peso) de una disolución es el número de gramos de soluto que hay por cada 100 gramos de disolución. Puede calcularse por la siguiente expresión:

\(Porcentaje masa en masa= \frac{masa soluto}{masa solucion}x100\)

En este caso,

Reemplazando en la definición de porcentaje masa/masa:

\(Porcentaje masa en masa= \frac{20 g}{100 g}x100\)

Resolviendo:

Porcentaje masa/masa= 20%

Finalmente, el porcentaje masa/masa de la solución es 20%.

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Answer:

B

Explanation:

I hope its right. I'm pretty sure.

Answer:

Explanation:

Copper Atom