Find the pH during the titration of 20.00 mL of 0.1000 M butanoic acid, CH₃CH₂CH₂COOH (Kₐ = 1.54X10⁻⁵), with 0.1000 M NaOH solution after the following additions of titrant:(c) 15.00 mL

The pH of the 0.140 M citric acid solution that is H₃C₆H₅O₇ is 1.99.

The chemical equation is as :

            H₃C₆H₅O₇ + H₂O  --->   H₂C₆H₅O₇⁻ + H₃O⁺

Initial         0.140                                0                0

Change        -x                                   +x              +x

Eq.                0.140 - x                         x               x

The acid ionization constant is the very small, that means the change in the concentration  have the negligible effect on equilibrium concentration for the citric acid.

The expression for the Ka is as :

Ka = [H₂C₆H₅O₇⁻] [ H₃O⁺] / [H₃C₆H₅O₇]

7.4 × 10⁻⁴ = x₂ / 0.140

x = 0.0101

The concentration of the [ H₃O⁺] = 0.0101 M

The pH of the citric acid solution is :

pH = -log (0.0101)

pH = 1.99

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Answer:

Flerovium

Explanation:

Answer:

Fl or flerovium. Atomic number is the number above the element on a periodic table.

Answer: The main difference between the two is their fat content. Heavy cream has slightly more fat than whipping cream. Otherwise, they are nutritionally very similar. You can use them interchangeably in recipes without affecting the taste, although they may lead to different consistencies.

Explanation:

It is important to add the same amount of alkyl halide to each test tube in the nucleophilic substitution experiment for two main reasons.

Firstly, the amount of reactants used in a chemical reaction can greatly affect the outcome of the reaction. If different amounts of the alkyl halide are added to each test tube, the reaction rates will differ and the products obtained will be inconsistent, making it difficult to draw accurate conclusions from the experiment.

Secondly, by adding the same amount of alkyl halide to each test tube, the experiment can be considered fair and controlled. This means that any differences observed in the reactions can be attributed solely to the changes in the nucleophile used in each reaction. It allows for accurate comparison of the reactions and the identification of trends or patterns in the reactivity of different nucleophiles.

Overall, adding the same amount of alkyl halide to each test tube in the nucleophilic substitution experiment ensures that the results obtained are reliable and can be used to draw meaningful conclusions.

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Answer:  P2 = 0.858 atm

Explanation:

Use the combined gas law:  P1V1/T1 = P2V2/T2,

where the subscripts are the initial (1) and final (2) states.  Temperature must be in Kelvin.  We want P2, so rearrange the equation to solve for P2:

P2 = P1(V1/V2)(T2/T1)

Note how I've arranged the volume and temperature values:  as ratios.  Now it is easy to cancel units and see what is going to happen to the pressure if we lower the temperature.  Since the pressure change is a function of (T2/T1), and we are lowering the temperature (T2), we'd expect this to decrease the pressure.

No information is given on volume, so we'll assume a convenient value of 1 liter.  Now enter the data:

P2 = (0.917atm)*(1)*(322K/344K)

P2 = 0.858 atm

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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The percent yield of b in a reaction that uses 25.0 g of starting material a, has a theoretical yield of 2.0g of b, and an actual yield of 17.0 g of b is 11.764%

The percentage yield is experimental to theoretical yield divided by 100

Theoretical yield of 2.0g of b, and an actual yield of 17.0 g of b

So % yield is 2/17x100=11.764

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Answer:

the answer is d.

1. Write the symbols for each element.

2. Find the charge for each element using the Periodic Table. Write it above each element. (because there is a (III) after nickel, the charge of nickel is +3. oxygen is in group 16, which means it has a -2 charge.)

3. See if the charges are balanced (if they are you're done!)

- when you criss cross (getting Ni2O3, the charges are canceled out, so the equation is balanced.

if you still need help or if this is confusing, look up How to Write the Formula for Nickel (III) oxide  by Wayne Breslyn on YT.

Answer:

D.) Ni2O3

Explanation:

edge 2021 (just needed the daily answer)

The digital signal is a signal that encodes data as a series of discrete values; at any one moment, it can only take on a maximum of one of a finite set of values.

A digital signal, in contrast, represents continuous values; it always reflects a real number within a continuous range of values. Information is represented by simple digital signals in discrete analogue level bands. The same information state is represented by all levels in a band of values. The signal in the majority of digital circuits can have two legitimate possible values; this is known as a binary signal or logic signal.

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Answer:

\(\Delta T=57.01^{\circ} C\)

Explanation:

Given that,

The mass of nickel, m = 70 g

Energy absorbed, Q = 1756 J

The specific heat of Nickel, c = 0.440 J/g °C

We know that,

The heat absorbed is given by :

\(Q=mc\Delta T\\\\\Delta T=\dfrac{Q}{mc}\\\\\Delta T=\dfrac{1756}{70\times 0.44}\\\\=57.01^{\circ} C\)

So, the change in temperature is equal to \(57.01^{\circ} C\).

In a sample of ground beef, there were 18.9% protein and 21.4% fat, both expressed in mass. Therefore, 125g of ground beef has 147.5 kilocalories.

The now-defunct kinetic theory of heat served as the basis for the calorie, a unit of energy. For historical reasons, the term "calorie" has two main definitions that are often employed.

Originally, the amount of heat needed to raise the temperature of one kg of water by one degree Celsius was referred to as a large calorie, dinner calorie, dietary nutrient, and kilo calorie (or one kelvin). A minuscule calorie or tiny calorie is the term used to describe the quantity of heat needed to produce the same increase in one kilogram of water.

The needed number of calories for ground beef is m.

protein in it = .18m

fat in it =  .21m

1 gram of protein gives 4 cals .

1 gram of fat gives 9 cals .

4 x .18m  + 9 x  .21m = 350

m = 147.5kilocalories

Therefore, 125g of ground beef has 147.5 kilocalories.

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Answer:

cell membrains

Explanation:

Answer:

690 g IrI₃

Explanation:

To convert from moles to grams, you have to use the molar mass of the compound. The molar mass of IrI₃ is 572.92 g/mol. You use this as the unit converter in this equation:

\(1.2molIrI3 * \frac{572.92g}{1mol} = 687.504 g IrI3\)

Round to the lowest number of significant figures which is 2 to get 690 g IrI₃.

The molar mass of the unknown gas is 43.87 g/mol.

To determine the molar mass of the unknown gas, consider Graham's law of effusion, wherein we can equate the ratio between the times of effusion of the two gases, to the ratio of the roots of the molar masses of the unknown gas and He gas, such that:

t_He / t_unknown gas = √MW_He / √MW_unknown gas

If He gas is observed to effuse through a porous barrier in 8.76 minutes and under the same conditions, the same number of moles of an unknown gas requires 29.0 minutes to effuse through the same barrier, then the molar mass of the unknown gas can be solved as follows.

8.76 minutes / 29.0 minutes = (√4.002602 g/mol) / √MW_unknown gas

√MW_unknown gas = (√4.002602)(29.0 minutes) / (8.76 minutes)

MW_unknown gas = 43.87 g/mol

Hence, the molar mass of the unknown gas is 43.87 g/mol.

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The difference in binding energy per nucleon between 23/11 Na and 23/12 Mg can be calculated by finding the total binding energy for each isobar and dividing it by the respective number of nucleons.

To calculate the difference in binding energy per nucleon between the isobars 23/11 Na and 23/12 Mg, we need to find the total binding energy for each isobar and then divide it by the respective number of nucleons.

The atomic mass of 23/11 Na is 23, which means it has 23 nucleons (protons and neutrons). The atomic number is 11, indicating it has 11 protons.

The atomic mass of 23/12 Mg is also 23, so it has 23 nucleons. However, the atomic number is 12, indicating it has 12 protons.

We can use the equation:

Binding Energy per Nucleon = (Total Binding Energy) / (Number of Nucleons)

To find the total binding energy, we can consult a table or use an approximate average value. Let's assume the average binding energy per nucleon for both elements is 8.5 MeV (million electron volts).

For 23/11 Na:

Binding Energy per Nucleon = (Total Binding Energy of Na) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

For 23/12 Mg:

Binding Energy per Nucleon = (Total Binding Energy of Mg) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

The difference in binding energy per nucleon can then be calculated by subtracting the value for Na from the value for Mg.

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Answer:

What is the name of the lab tool that is used to transfer a sample to a microscope slide?

A-a dropper

C-scissors

D-a ruler

Explanation:

got it wrong but this is the answer edg 2021

In the preparation of a microscopic slide, the items which are used are medicine dropper, scissors, and a slip cover. Thus, the correct option is D.

Microscope slides are made for the purpose of observations of different objects. After the observation, the slides are discarded. In most cases, the slides use a liquid mounting medium such as water or glycerin.

The procedure for the preparation of the slide is as follows:

1. Place a drop of liquid mounting medium in the center of the slide.

2. Position the sample on liquid with the use of tweezers.

3. At an angle, place one side of the cover slip against the microscopic slide making contact with outer edge of the liquid drop.

4. Lower the cover slip slowly, avoiding air bubbles.

5. Remove the excess water present in it with the help of paper towel.

Therefore, the correct option is D.

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Answer:

The order of the reaction with respect to D is 2, and the order with respect to G is 1.

Explanation:

To determine the order of a reaction with respect to each reactant, we look at how changing the concentration of a reactant changes the rate of the reaction.

Looking at the initial concentrations and rates for D in experiments 1 and 2, when the concentration of D is doubled (from 0.025 to 0.050), the rate of reaction quadruples (from 0.00480 to 0.0192). This indicates that the order of the reaction with respect to D is 2, because the rate of reaction changes by the square of the change in concentration.

Next, we look at the initial concentrations and rates for G in experiments 3 and 4. In these experiments, when the concentration of G is quadrupled (from 0.020 to 0.080), the rate of the reaction also quadruples (from 0.0986 to 0.394). This indicates that the order of the reaction with respect to G is 1, because the rate of reaction changes directly with the change in concentration.

So, the order of the reaction with respect to D is 2, and the order with respect to G is 1.

The density of the unknown solid is approximately 109.864 lb/ft³. To convert the density from grams per cubic centimeter (g/cm³) to pounds per cubic foot (lb/ft³), we need to use appropriate conversion factors.

1 gram is equal to 0.00220462 pounds, and 1 cubic centimeter is equal to 0.0000353147 cubic feet.

First, let's convert the density from g/cm³ to kg/m³. Since 1 kg is equal to 1000 grams and 1 cubic meter is equal to 1,000,000 cubic centimeters, we can use the following conversion:

Density in kg/m³ = Density in g/cm³ × 1000 kg/m³ ÷ 1 g/cm³

Density in kg/m³ = 18.5 g/cm³ × 1000 kg/m³ ÷ 1 g/cm³ = 18500 kg/m³

Now, let's convert the density from kg/m³ to lb/ft³. Since 1 kilogram is equal to 2.20462 pounds and 1 cubic meter is equal to 35.3147 cubic feet, we can use the following conversion:

Density in lb/ft³ = Density in kg/m³ × 2.20462 lb/ft³ ÷ 1 kg/m³ ÷ 35.3147 ft³/m³

Density in lb/ft³ = 18500 kg/m³ × 2.20462 lb/ft³ ÷ 1 kg/m³ ÷ 35.3147 ft³/m³ ≈ 109.864 lb/ft³

Therefore, the density of the unknown solid is approximately 109.864 lb/ft³.

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Answer:

A

Explanation:

potassium because it has valance electrons by giving out proteins

Answer:

Explanation:

Electron affinity is the measure of an atom 's tendency to form a negative ion. Electron affinity can be measured by the amount of energy released when an electron is added to an atom to form a negative ion. When forming a negative ion, an atom undergoes the following reaction:: atom + electron (e -) -> negative ion + energy

Answer:

Ions and charged particles

Explanation:

An ionic compound consists of a ions and a charged particles

The two kinds of carbonyl acceptor structures that can be used in addition to benzoate esters in the reaction with phenylmagnesium bromide to afford triphenylmethanol are aldehydes and ketones.

Aldehydes and ketones are organic compounds that contain a carbonyl group, which consists of a carbon atom double-bonded to an oxygen atom. In aldehydes, the carbonyl group is located at the end of a carbon chain, while in ketones, it is positioned in the middle of a carbon chain. Both aldehydes and ketones can undergo a reaction with phenylmagnesium bromide (PhMgBr) to form a Grignard reagent, which is a highly reactive organometallic compound. The Grignard reagent can then attack the carbonyl carbon, leading to the addition of a phenyl group (C6H5) to form an alcohol known as triphenylmethanol. This reaction is a common method for synthesizing triphenylmethanol and other related compounds in organic chemistry.

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0.034 mol of carbon dioxide gas, are there in 0.667 L.

We can assume that the volume of one mole of any gas is 22.4 L we know that the pressure of the gas is 1 atmosphere and that the temperature of a gas is 0C

This type is called standard temperature and pressure (STP).

This can be calculated by using the formula in which we can find the moles:

PV =nRT------(1)

Where P is the pressure

V is volume

T is the temperature in Kelvin

R is the ideal gas constant consistent with the units of volume and pressure.

0.667 L x 1 mol/22.4 L = 0.034 mol

And 0.667 liters of CO2 or any other gas at STP would contain 0.034 moles.

If the gas was at some other temperature or pressure, assuming they were “moderate,” you could calculate the number of moles by solving the following formula for n.

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The atomic number remains the same for all atoms of the same element.

The atom is composed of;

The electrons are found in the orbit while protons and neutrons are found in the nucleus of the atom.

The number of protons in an atom is its atomic number. It is the identity of an element. All atoms of the same element must have the same atomic number even though they may differ in mass number.

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Answer:

D. 1x10⁻¹¹ M

Explanation:

For any given aqueous solution the following formula is true:

1x10⁻¹⁴ = [H₃O⁺] * [OH⁻]

1x10⁻¹⁴ is the ion-product constant of water, Kw.

We input the given value of [H₃O⁺]:

1x10⁻¹⁴ = 1x10⁻³ * [OH⁻]

And solve for [OH⁻]:

[OH⁻] = 1x10⁻¹¹ M

Thus the correct answer is option D. 1x10⁻¹¹ M.

Answer:

D. 1x10⁻¹¹ M

Explanation:

I took the test :)

Explanation:

use the term electron sheilding, the more electrons between the valence el3ctron and nucleus the easier to lose the valence electron (more sheilding = easier to lose)