The Ka values for several weak acids are given below. Which acid (and its conjugate base) would be the best buffer at pH 3.7?
a. MES: Ka 7.9 x 10
b. HEPES; Ka 3.2 x 103
c. Tris; Ka 6.3 x 109
d. Formic acid: K 1.8 x 10

Answer:

Exothermic reactions are reactions in which energy is released in the form of light, heat, etc.

for example :-

=》CaO + H2O -> Ca(OH)2

Answer:

The answer is the first one.

Explanation:

The lower a pH level the higher the the number hydrogen ions present in the acid's container.

ph = - log(H)

4 = - log(H)

- 4 = log(h)

10^-4 = H+

1 * 10^-4 = H +

ph = - log(H)

ph = 2

- 2 = log(H)

10^-2 = H

1*10^-2 = h

Something the power - 2 is 100 times greater than something with the power of -4

Answer:

the guy above is correct

Explanation:

Filtration is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture.

Evaporation is a technique used to separate out homogeneous mixtures that contain one or more dissolved salts. This process drives liquid components out of solid components. This process usually heats the mixture until the liquid is gone.

Distillation is an effective method of separating mixtures of two or more pure liquids. Distillation is a purification process that vaporizes, condenses, and separates the components of a liquid mixture.

Chromatography is the separation of a mixture by passing it in solution or suspension, or as a vapor through a medium in which the components move at different rates. Thin-layer chromatography is a special type of chromatography used for separating and identifying mixtures that are or can be colored especially pigments.

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Answer:

1.59

Explanation:

14=pOH+pH

pOH=14-12.41

pOH=1.59

Answer:

I hope this will help

Explanation:

Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper.

Answer:

Its C!

Explanation:

NH3 and OH- are both a Brønsted-Lowry base, while H2O and NH4 are acids!

Hope this helped!

The following is an example of a Bronsted-Lowry base will be

A material that receives protons is known as just a Bronsted-Lowry base.

Ammonia was pleased to receive a proton mostly from water's hydrogen (H2O) to form NH4. Therefore, NH3 will be considered as Bronsted-Lowry base.

Therefore, the correct answer will be NH3.

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Answer:

C6H6

Explanation:

Just use the table method to find the ratio of C to H and then compare the RMM with that of the empirical formula.

Answer:

C6H6

Explanation:

We divide each percentage by the relative atomic mass of the element:

Carbon:  92.31 / 12.011 = 7.68

Hydrogen:  7.69 / 1.008 = 7.63

So the ratio of carbon to hydrogen is 1:1.

Empirical formula is CH  - which has a  MM of 13.019

The RMM is 78 so the molecular formula = 78/13.019 = 6 * CH

So it is C6H6  (Benzene).

The mass of H₂ used in the reaction, given that 2.75 g of CO was inserted is 0.39 grams

The mass of H₂ used in the reaction can be obtained as illustrated below:

Balanced equation:

CO + 2H₂ -> CH₃OH

From the balanced equation above,

28 grams of CO required 4 grams of H₂

Therefore,

2.75 grams of CO will require = (2.75 grams × 4 grams) / 28 grams = 0.39 grams of H₂

Thus, we can conclude that the mass of H₂ used in the reaction is 0.39 grams

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Answer:

When there is an interaction between two objects.

Explanation:

Answer:

The balloon transport system or Hot Air Balloon is one of several transportation methods in RuneScape. During the Enlightened Journey quest it can be used for travel between two locations. After the quest is complete, four more locations are available to be unlocked by completing respective journeys to those locations.

Explanation:

transportation

Answer:

B. changes in energy during the reaction

Explanation:

y-axis measures "energy" and x-axis measures "reaction progress". Those units fit well with (B) and not so well with concentration and time (A), phases and temperature (C), or reaction rate and time (D).

Answer:

b. changes in energy during reaction

Explanation:

graph

The density of aluminum 2.7 g/cm3 in kilograms per cubic meter is  2700 \(kg/m^{3}\) .

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. The formula for density is mass divided by volume:

ρ = M/V

where m is the mass and V is the volume.

The kilogramme is equal to one gramme divided by one thousand.

So, (2.7/1)×(1000000/1000)

= 2700 \(kg/m^{3}\)

Therefore, the density of aluminum 2.7 g/cm3 in kilograms per cubic meter is  2700 \(kg/m^{3}\) .

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None of the species NH4+, KMnO4, Fe(OH)2, and CH3COOH are insoluble in water.

NH4+ ions are typically soluble, forming ammonium compounds that dissolve in water. KMnO4, or potassium permanganate, is a strong oxidizing agent and dissolves well in water. Fe(OH)2, or iron(II) hydroxide, is only slightly soluble in water but still forms a suspension. CH3COOH, or acetic acid, is a weak acid that readily dissolves in water, producing a solution with a pH less than 7. Overall, all these species exhibit some level of solubility in water.

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Answer:

Filtration

Explanation:

The unscrambled word from CAPANTILLES is CAPITALS and the answer needs to be in all caps.  

The unscrambled Escape Word is "PANICATLAS."

The unscrambled word from CAPANTILLES is CAPITALS. The word was given in all caps in the question itself, hence the answer should also be in all caps.


1. The given word CAPANTILLES needs to be unscrambled.
2. After unscrambling, the word obtained is CAPITALS.
3. The answer needs to be in all caps as mentioned in the question.
4. Therefore, the correct answer is CAPITALS in all caps.

The answer to unscramble the given word CAPANTILLES is CAPITALS in all caps.


To unscramble the word "CAPANTILLES," we need to rearrange the letters in a way that creates a meaningful word. By rearranging the letters, we come up with the word "PANICATLAS."


1. Identify the given word: CAPANTILLES
2. Rearrange the letters to find a meaningful word
3. After rearranging the letters, the word PANICATLAS is formed
: After unscrambling the word CAPANTILLES, we get the Escape Word "PANICATLAS."

The unscrambled Escape Word from CAPANTILLES is PANICATLAS.

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Answer:

D

Explanation:

Answer:

Newtons Second law of motion

Explanation:

The parameter that is kept constant in a coffee-cup calorimeter is the pressure.

A coffee cup calorimeter consists of a coffee cup, a thermometer, water, and a reactant placed inside the cup. Unlike a bomb calorimeter, a coffee cup calorimeter is a constant pressure calorimeter.

calorimeter is a device used to measure the amount of heat involved in a chemical or physical process. For example, when an exothermic reaction occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature. When an endothermic reaction occurs, the heat required is absorbed from the thermal energy of the solution, which decreases its temperature . The temperature change, along with the specific heat and mass of the solution, can then be used to calculate the amount of heat involved in either case.

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MALDI-TOF MS has certain advantages over ESI-MS viz.

(i) MALDI-TOF MS produces singly charged ions, thus interpretation of data is easy comparative to ESI-MS,

(ii) for analysis by ESI-MS, prior separation by chromatography is required which is not needed for MALDI-TOF MS analysis (Everley et al., 2008).

Matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry (MS) has become a widely used technique for the rapid and accurate identification of bacteria, mycobacteria and certain fungal pathogens in the clinical microbiology laboratory.

MALDI is the abbreviation for "Matrix Assisted Laser Desorption/Ionization." The sample for MALDI is uniformly mixed in a large quantity of matrix. The matrix absorbs the ultraviolet light (nitrogen laser light, wavelength 337 nm) and converts it to heat energy.

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Scandium nitrate are Sc(NO3)3 ionic compound.

Using Type III binary compound criteria, compounds that only contain non-metal components are called. In contrast to ions, which have charges, these molecules are always neutral and only include two elements (for compounds that contain only non-metal elements but more than two elements, see the acid naming section below).

The ionic compound sodium chloride, on the other hand, includes ions. Ionic compounds are made of ions and are held together by the attraction interactions between the ions with opposing charges. The most popular ionic substance is table salt (sodium chloride).

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Answer: To efficiently communicate with others

Explanation:

this was the right on answer for me might be different for others

The main need or want the wave technology shown meets to see objects surrounding more clearly.

It is a floating device that operates in the same direction as the waves. With the use of the technology, energy may be captured even from relatively small waves. The device that is moved by waves activates a hydraulic system that can power a generator. The tube segment contains all the generation equipment and systems.

Early mechanization (1770s to 1830s), steam power and railroads (1830s to 1880s), electrical and heavy engineering (1880s to 1930s), Fordist mass production (1930s to 1970s), and information and communication are the five waves that have so far slammed into our society (1970s to 2010s).

Wave energy, also known as wave power, is the energy that ocean surface waves carry and absorb. The energy is then put to use in a variety of productive ways.

Thus, The main need or want the wave technology shown meets to see objects surrounding more clearly.

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The highest temperature during the day occurs many hours after the maximum solar radiation receipt, which illustrates the greatest lag.

Where in India is the temperature the highest?

Sri Gangapur. This city, located at an altitude of 178 metres in Jaipur, the largest state in the nation, has India's highest temperature. The highest temperature ever measured there was 50 degrees Celsius.

What's the maximum temperature a person can withstand?

Death will almost likely occur at 46 °C (111.2 °F) or higher, but people have been reported to live up to 43 °C (115.7 °F). Normal death occurs at 43 °C (109.4 °F), but there is also a chance of major brain injury, ongoing convulsions, and shock.

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The statement is true. An dipole occurs when one molecule with a permanent dipole repels another molecules electrons causing the electrons to be more concentrated on one end of the molecule than another.

Dipole-dipole attraction:

Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule.

For molecules of similar size and mass, the strength of these forces increases with increasing polarity. Polar molecules can also induce dipoles in nonpolar molecules, resulting in dipole-induced dipole forces.

A molecule with a permanent dipole moment is called a polar molecule. A permanent dipole occurs when two atoms in a molecule have substantially different electronegativity.

Therefore a dipole occurs when one molecule with a permanent dipole repels the electrons of another molecule to be more concentrated on one end of the molecule than another is a true statement.

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Answer:

Explanation: The goal of every country should be to produce more materials and goods

The final balanced chemical equation is; CNO₃⁻ + 2Sn²⁺ + 4H⁺ → 2Sn⁴⁺ + NO + 3H₂O, and the other balanced equation is; BIO₃⁻  + 5H₂SO₃ + 3H⁺ → I₂ + 5SO4²⁻ + 4H₂O.

Part; CNO₃⁻(aq)+Sn²⁺(aq)→Sn⁴⁺(aq)+NO(g)

First, we need to determine the oxidation states of each element:

CNO₃⁻; C(+3), N(+5), O(-2)

Sn²⁺; Sn(+2)

Sn⁴⁺; Sn(+4)

NO; N(+2), O(-2)

The oxidation state of nitrogen decreases from +5 to +2, while the oxidation state of tin increases from +2 to +4. Therefore, this is a redox reaction.

To balance the reaction, we can start by balancing the number of each type of atom. Then, we add H⁺ to balance the charges and finally, add electrons to balance the oxidation states.

CNO₃⁻ + Sn²⁺ → Sn⁴⁺ + NO

First, balance the number of each type of atom;

CNO₃⁻ + 2Sn²⁺ → 2Sn⁴⁺ + NO

Next, add H⁺ to balance the charges;

CNO³⁻ + 2Sn²⁺ + 4H⁺ → 2Sn⁴⁺ + NO + 3H₂O

Finally, add electrons to balance the oxidation states;

CNO₃⁻ + 2Sn²⁺ + 4H⁺ → 2Sn⁴⁺ + NO + 3H₂O

2e⁻ + CNO₃⁻ + 2Sn²⁺ + 4H⁺ → 2Sn⁴⁺ + NO + 3H₂O + 2e⁻

The final balanced equation is;

CNO₃⁻ + 2Sn²⁺ + 4H⁺ → 2Sn⁴⁺ + NO + 3H₂O

Part BIO₃⁻(aq)+H₂SO₃(aq)→I₂(aq)+SO4²⁻(aq)

First, we need to determine the oxidation states of each element;

BIO₃⁻;  B(+3), I(+5), O(-2)

H₂SO₃; H(+1), S(+4), O(-2)

I₂; I(0)

SO4²⁻; S(+6), O(-2)

The oxidation state of iodine decreases from +5 to 0, while the oxidation state of sulfur increases from +4 to +6. Therefore, this is a redox reaction.

To balance the reaction, we can start by balancing the number of each type of atom. Then, we add H⁺ to balance the charges and finally, add electrons to balance the oxidation states.

BIO₃⁻  + H₂SO₃ → I₂ + SO4²⁻

First, balance the number of each type of atom;

BIO₃⁻ + 5H₂SO₃ → I₂ + 5SO4²⁻ +H₂O

Next, add H+ to balance the charges;

BIO₃⁻  + 5H₂SO₃ + 3H⁺ →I₂ + 5SO4²⁻ + 4H₂O

Finally, add electrons to balance the oxidation states;

BIO₃⁻  + 5H₂SO₃ + 3H⁺ → I₂ + 5SO4²⁻+ 4H₂O

6e⁻ + BIO₃⁻  + 5H₂SO₃ + 3H⁺ → I₂ + 5SO4²⁻ + 4H₂O + 6e⁻

The final balanced equation is;

BIO₃⁻  + 5H₂SO₃ + 3H⁺ → I₂ + 5SO4²⁻ + 4H₂O.

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Answer:

Deciduous forests

Explanation:

Each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately \(1.8 * 10^{24}\) atoms in a mole of water.

In the International System of Units, the mole (symbol mol) is the unit of substance amount (SI). The amount of substance is a measurement of how many elementary entities of a given substance are present in an object or sample.

An elementary entity can be an atom, a molecule, an ion, an ion pair, or a subatomic particle such as an electron, depending on the substance. For example, despite having different volumes and masses, 10 moles of water (a chemical compound) and 10 moles of mercury (a chemical element) contain equal amounts of substance, and the mercury contains exactly one atom for each molecule of water.

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Answer:

sulfuric acid

Explanation:

The conjugate acid of HSO4 -1 is H2 SO4. Adding one hydrogen ion to the hydrogen sulfate ion generates the conjugate acid. Its name is sulfuric acid.