calculate the ph of a 0.10 m solution of sodium formate (NaHCOO) given that the Ka of formic acid (HCOOH) is 1.8 x 10^-4.

The cleaning action of soaps and detergents is attributable to their ability to form micelles. Micelles are small clusters of molecules that are formed when the hydrophobic (water-repelling) tail of a soap or detergent molecule faces inward, while the hydrophilic (water-attracting) head faces outward.

This arrangement allows the soap or detergent to surround and suspend dirt, oil, and other particles in water, making them easier to remove from surfaces. Soaps and detergents do not evaporate quickly, nor do they have short hydrocarbon tails or acidic character that contribute to their cleaning action.

Therefore, their ability to form micelles is the primary reason for their effectiveness in cleaning.

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The percentage strength of the solution is 1%.

According to question,

we are given that the 20mg of cromolyn sodium in 2 ml of normal saline is taken.

Now, to find the percentage strength first know the meaning of percentage strength.

The amount of solute dissolved in gram per liter of the solution is used to determine the solution's strength. It stands for the solution's potency or concentration. It uses gram per liter of expression.

Now here we are given the the mass and volume connection so we have to find the percentage in terms of it.

percentage strength=\(\frac{mass}{volume} *100\)

percentage strength=\(\frac{0.020*100}{2}\)

on solving we get,

percentage strength=1%

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Answer:

Car lights are designed for two functions - to assist the driver and to communicate with other drivers. Accidents are more likely to occur when motorists fail to practice proper use of their lights.

Car lights include: Headlights. There are two types of headlights—low beam and high beam. These lights allow the driver to see the roadway in the dark, while also signaling to other motorists that a car is present.

Most drivers simply get into the car, start it and doesn't even think of lighting or the fact that it can provide security. But most of the light is about security and communications. The headlights and tail lamps ensure that other drivers see you, even in reduced visibility. This is crucial to avoid accidents.

Answer: The volume for this gas is 0.732 L.

Explanation:

Given : No. of moles = 0.582 mol

Temperature = \(15^{o}C = (15 + 273) K = 288 K\)

Pressure = 18.8 atm

Using the ideal gas equation, volume for the given gas is calculated as follows.

PV = nRT

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula.

\(PV = nRT\\18.8 atm \times V = 0.582 mol \times 0.0821 L atm/mol K \times 288 K\\V = \frac{0.582 mol \times 0.0821 L atm/mol K \times 288 K}{18.8}\\= \frac{13.761}{18.8}\\= 0.732 L\)

Therefore, it can be concluded that the volume for this gas is 0.732 L.

The answer for {3. 45cm+1. 270cm+0. 05cm}{34. 921cm}x{89cm} is 12.149087 x 10^4 cm^3.

Scientific notation, also known as exponential notation, is a way of expressing numbers that are very large or very small. It is commonly used in scientific and mathematical calculations to represent numbers in a concise and standardized format.

To solve the given expression, let's perform the calculations step by step:

First, let's add the numbers in the numerator:

3.45 cm + 1.270 cm + 0.05 cm = 4.77 cm

Now, let's divide the numerator by the denominator:

4.77 cm / 34.921 cm = 0.136483

Finally, let's multiply the result by 89 cm and express it in scientific notation:

0.136483 x 89 cm = 12.149087 cm

So, the answer is 12.149087 x 10^4 cm^3.

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Answer:

the second one

Explanation:

it makes the most sense

Answer:

b

Explanation:

because the correct answer

The correct option is b) (i) electronegativity, (ii) Pauling, (iii) 4.0, (iv) increases, (v) decreases.

The ability of an atom to attract shared electrons to itself is called electronegativity. It is generally measured on the Pauling scale. An arbitrary value of 4.0 is assigned to fluorine, which has the greatest ability to attract electrons. Electronegativity generally increases across a period (from left to right in the periodic table) and decreases down a group (top to bottom). This is because the effective nuclear charge increases across a period, making it harder for electrons to be pulled away from the nucleus, whereas down a group, the increasing distance between the nucleus and valence electrons reduces the attraction between them.

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Complete question:

Fill in the blanks with the appropriate option. The ability of an atom to attract shared electrons to itself is called (i). It is generally measured on the (ii) scale. An arbitrary value of (iii) is assigned to fluorine (have greatest ability to attract electrons). It generally (iv) across a period and (v) down a group.

a) (i)polarity, (ii)Pauling, (iii)2.0, (iv)decreases, (v)increases

b) (i)electronegativity, (ii)Pauling, (iii) 4.0, (iv) increases, (v)decreases

c) (i)valency, (ii)Mulliken, (iii)1.0, (iv) decreases, (v)increases

d) (i)electron affinity, (ii)Mulliken, (iii)2.0, (iv)increases, (v)increases

Answer:

1) Tin. It is stable to water under ambient conditions but on heating with steam, tin reacts with water to from tin dioxide and hydrogen. It is stable in air under ambient conditions but on heating in air or oxygen, tin reacts with oxygen to from tin dioxide.

2) Nitric oxide combines with water vapour in the atmosphere to form nitric acid, which is one of the components of acid rain. Heightened levels of atmospheric nitric oxide resulting from industrial activity were also one of the causes of gradual depletion of the ozone layer in the upper atmosphere.

Answer:

A, D, E

Explanation:

Answer:

Made of cells

Explanation:

cells are the basic building blocks of life

The correct answer is b. an amino and a carboxyl group. The reaction of amino acids to form peptides involves the condensation reaction, also known as dehydration synthesis or peptide bond formation.

In this reaction, the carboxyl group (-COOH) of one amino acid reacts with the amino group (-NH2) of another amino acid, resulting in the formation of a peptide bond (-CO-NH-) and the release of a molecule of water. This process repeats as more amino acids join together, forming a peptide chain. The amino group of one amino acid links with the carboxyl group of the adjacent amino acid, and so on, leading to the formation of a peptide or protein. This reaction is known as a condensation reaction or dehydration synthesis because a molecule of water is eliminated during the bond formation process.

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Answer:

True

Explanation:

Generally makes sense.

Answer:

John Dalton

John Dalton, an English chemist and meteorologist, is credited with the first modern atomic theory based on his experiments with atmospheric gases.

Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals.

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Higher temperatures and lower pressures produce optimum gas behaviour. Because of the gas's intermolecular interactions, potential energy becomes significantly lower than kinetic energy under these circumstances.

What is potential energy?

Potential energy is a form of energy that is stored but is dependent on the relative positions of different system components. Stretching or compressing a spring increases its potential energy. A steel ball has more potential energy when it is raised above the surface of the earth than when it is brought to Earth.

Any object that is raised from rest has energy that can be released at a later time; for this reason, it is referred to as potential energy.

Therefore, Higher temperatures and lower pressures produce optimum gas behaviour.

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A laboratory owned by a company other than the physician's practice is typically referred to as an "independent laboratory" or an "external laboratory." These laboratories are separate entities from the physician's practice and may provide various diagnostic, testing, or research services. They operate independently and may serve multiple healthcare providers or organizations.

Independent laboratories play a crucial role in the healthcare industry by offering specialized testing, advanced technologies, and expertise that may not be available within a physician's practice. They often handle a wide range of laboratory services, including clinical chemistry, microbiology, pathology, genetic testing, and more.

Physicians and healthcare providers may send patient samples or specimens to independent laboratories for analysis and diagnostics. The results obtained from these laboratories can aid in accurate diagnoses, treatment decisions, and monitoring of patient health.

Overall, independent laboratories contribute to the comprehensive healthcare system by providing specialized laboratory services and collaborating with healthcare providers to deliver quality patient care.

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Answer:

what are the following?

As atom size grows, the bond dissociation energy of the halogen family decreases down the group.

The bond strength increases with bond length. A shorter bond results from a greater bond order for a given pair of atoms. The energy needed to dissolve a bond is known as the bond dissociation energy (BDE). The BDE is always positive since the production of a bond releases energy (H 0), but the breaking of a bond involves the intake of energy (H > 0). The weak attractive interactions that exist between the individual molecules of a molecular covalent material are known as intermolecular forces. The bond dissociation energy, or the amount of energy needed to dissolve a given covalent bond, is a measure of the bond's strength. molecules in a mole. Multiple bonds between the same atoms are more powerful than a single bond. I will have the weakest bond strength and F will have the strongest bond when it comes to electronegativity.

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The amount of energy needed to raise the temperature from -20° to 0° is 730.8 J.

1) The specific heat capacity of a substance is the amount of heat needed to raise its temperature by one degree Celsius. Joules are commonly used to measure the amount of heat (J).

2) The capacity of a substance to produce heat per gram is determined by another attribute called specific heat.

By using the formulae of specific heat capacity

q = m x C x ΔT

q = mxc x (T2 - T1)

q = amount of heat energy

m = mass of sample

C = heat capacity of ice =2.03  (J/g C°)

T2 = final temperature

T = initial temperature

Mass of ice = 18 g

Initial temperature =   -20 C

Final temperature = 0°

q =  18×2.03 × (0-(20))

q = 730.8 j

By using the heat capacity formulae we can find the heat energy to raise the temperature .

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Answer:

   ‏‏‎ ‎

Explanation:‏‏‎ ‎‏‏‎ ‎‏‏‎ ‎

Answer:

we make water dirty

Explanation:

Answer:

N/A

Explanation:

"what is the anwser to this question" Is Not Available because this no question.

Please like this.

A polymer-based material can be characterized using various techniques and instruments.

Here's how to determine whether the polymer is a thermoset, the amount of filler present in it, what the filler is, and the quantity of antioxidants and UV absorbents present:

1. To determine if the polymer is a thermoset, heat it. Thermosets don't melt, but thermoplastics do.

2. To determine the amount of filler in the polymer, weigh a sample of the polymer and then burn it. The residue will be the filler. Subtract the residue's mass from the polymer's initial weight to determine the filler's weight.

3. To determine what filler is present, observe the residue after burning.

4. UV absorbents can be detected using UV-Vis Spectroscopy, while antioxidants can be determined using FTIR Spectroscopy.

5. To determine if the material has dye or pigment coloring, use colorimetry to measure its color, then compare it to the reference color of the polymer. If the color is different, it has dye or pigment coloring.

6. The polymer's thermoset can be identified using Differential Scanning Calorimetry (DSC) to examine the melting temperature, which is unique to each thermoset.

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The mass (in grams) of C2H6O necessary to produce 12.0 g CO2 is 6.29 g.

Given the following reaction:

C2H6O (l) + 3O2 (g) → 2CO2 (g) + 3H2O (l)

In the given reaction, 2 moles of CO2 is produced per 1 mole of C2H6O consumed. And also, the molar mass of CO2 is 44 g/mol.

So, 2 moles of CO2 has a mass of 2 × 44 = 88 g/mol.

The number of moles of CO2 produced is 12.0 g ÷ 44 g/mol = 0.273 mol of CO2.

Since the mole ratio of CO2 to C2H6O is 2 : 1.

Then the number of moles of C2H6O required to produce 0.273 mol of CO2 will be:

=0.273 mol of CO2 × 1 mol of C2H6O ÷ 2 mol of CO2

= 0.1365 mol of C2H6O.

The molar mass of C2H6O = 2(12.01 g/mol) + 6(1.01 g/mol) + 1(16.00 g/mol)

                                             = 46.08 g/mol

The mass of C2H6O required is:

0.1365 mol of C2H6O × 46.08 g/mol = 6.29 g of C2H6O is necessary to produce 12.0 g CO2.

Therefore, the mass (in grams) of C2H6O necessary to produce 12.0 g CO2 is 6.29 g.

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Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed

The thing that is happen in a food sample as it is burned is the chemical and physical change.

Comubustion reactions are those reactions in which organic compound get burnt in the presence of oxygen for the formation of carbon dioxide gas and water molecule.

If the food sample contains the organic compound then it will convert into water and carbon dioxide gas and if it contains the matter in the form of inorganic compounds then it will convert into another product but having the same mass.

Hence if matter of food sample is burned then it will convert into small products as a result of physical or chemical change.

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The peptide bond between which two amino acid residues is cleaved by HIV protease will be "Phenylalanine Proline".

Whenever the carboxyl group with one molecule combines at all with  the amino group of the other molecule, a molecule of water is released, and a peptide bond is created among the two molecules (\(H_{2} O\))

The HIV protease breaks down large precursor proteins towards smaller ones. A new HIV virus is created when these smaller proteins interact with both the genetic material of HIV. HIV cannot replicate when protease is blocked by protease inhibitors (PIs).

HIV protease breaks down freshly created polyproteins specifically, Gag as well as Gag-Pol at nine cleavage sites to produce the mature protein components of such an HIV virion, the infectious version of the virus beyond the host cell. HIV virions do not spread disease in the absence of an efficient HIV protease.

Therefore, the peptide bond between which two amino acid residues is cleaved by HIV protease will be "Phenylalanine Proline".

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