To make an acetate buffer at ph 4.76 starting with 500 ml of 0.1 m sodium acetate (pk acetic acid = 4.76), you could add:_________

The molality of the solution that contains 16.32 g of glucose is calculated as 0.180 m.

Molality can be defined as number of moles of solute per kilogram of solvent. To find the molality of the solution, we need to calculate number of moles of glucose and the mass of the solvent.

Molar mass of glucose (C6H12O6) is: 6 x 12.01 + 12 x 1.01 + 6 x 16.00 = 180.18 g/mol

Number of moles of glucose is: n = m / M = 16.32 g / 180.18 g/mol = 0.0905 mol

Mass of water is 505.0 g.

The molality is: molality = moles of solute / mass of solvent in kg

mass of solvent = 505.0 g = 0.5050 kg

molality = 0.0905 mol / 0.5050 kg = 0.1795 mol/kg

molality = 0.180 m

Therefore, the molality of the solution is 0.180 m.

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Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of blood = 473.176 mL

density = 1.06 g/mL

The mass of the blood is

mass = 473.176 × 1.06 = 501.56656

We have the final answer as

Hope this helps you

Answer:

501.57

Explanation:

i got it right

Answer:

When filling a burette for a titrant, adjust the burette so that the opening is near or below the eye leve preferably over the sink. Then, use a funnel to add the titrant into the burette. The titrant should be filled almost to the zero mark.

In quantum mechanics, an atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom.

This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus. The term, atomic orbital, may also refer to the physical region or space where the electron can be calculated to be present, as defined by the particular mathematical form of the orbital.

Each orbital in an atom is characterized by a unique set of values of the three quantum numbers n, ℓ, and m, which respectively correspond to the electron's energy, angular momentum, and an angular momentum vector component (the magnetic quantum number). Each such orbital can be occupied by a maximum of two electrons, each with its own spin quantum number s. The simple names s orbital, p orbital, d orbital and f orbital refer to orbitals with angular momentum quantum number ℓ = 0, 1, 2 and 3respectively. These names, together with the value of n, are used to describe the electron configurations of atoms. They are derived from the description by early spectroscopists of certain series of alkali metal spectroscopic lines as sharp, principal, diffuse, and fundamental. Orbitals for ℓ > 3 continue alphabetically, omitting j (g, h, i, k, …) because some languages do not distinguish between the letters "i" and "j".

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the grams of citric acid added to a 355 ml (12 oz) soda is 3.55e-1 grams

Assuming a concentration of 0.1%, which is a common level, we can estimate the amount of citric acid in a 355 ml (12 oz) soda can as follows:

0.1% = 0.1/100 = 0.001

Mass of citric acid in a 355 ml soda can = 0.001 x 355 = 0.355 grams

Therefore, the estimated mass of citric acid in a 355 ml (12 oz) soda can is 0.355 grams, which can be written in scientific notation as 3.55e-1 grams.

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Answer:

B and C

Explanation:

Most animals that live underwater have have gills and tails and vise versa hope this helps!

koukladina stop deleting my answers I'm trying to help people I'm not doing anything wrong stop it

Answer:

the two major sources of energy for the rock cycle are also shown; the sun provides energy for surface processes such as weathering, erosion, and transport, and the Earth's internal heat provides energy for processes like subduction, melting, and metamorphism.

The La Brea asphalt deposits have been trapping and preserving

organisms  for at least 38,000 years.

The La Brea Tar Pits, located in Los Angeles, California, are a group of tar pits that have been seeping asphalt for thousands of years. The asphalt has trapped and preserved the bones of animals that became stuck in it, as well as the remains of plants and other organic material.

The tar pits have been an important site for the study of Pleistocene era life, and the fossils that have been found there have provided a wealth of information about the animals that lived in the area during that time period. Some of the most commonly found species at the La Brea Tar Pits include saber-toothed cats, dire wolves, mammoths, and mastodons.

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Answer:

??

Explanation:

I can't tell, you don't have the answer choices up I can't see them

what are the in the drop-down boxes?

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

Answer:

No, hydrogen can't be a central atom.

Answer:

no

Explanation:

Answer:

the sing post

Explanation:

because the reference frame is a fixed object that determines whether a body is in motion or not so the other passengers are fixed but relative to the the the man is at rest but relative to the sign post it is in the motion, did I get me, sister

Taking into account the reaction stoichiometry, 0.14175 grams of H₂O are formed when a 17.50 mL sample of a 0.150 M solution of H₃PO₄ reacts with excess Ba(OH)₂.

In first place, the balanced reaction is:

2 H₃PO₄ + 3 Ba(OH)₂  → Ba₃(PO₄)₂ + 6 H₂O

By reaction stoichiometry (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:

The molar mass of the compounds is:

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

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= amount of moles÷ volume

In this case, you know for the reactant H₃PO₄:

Replacing in the definition of molarity:

0.150 M= amount of moles÷ 0.0175 L

0.150 M× 0.0175 L= amount of moles

0.002625 moles= amount of moles

So, 0.002625 moles of H₃PO₄ react.

The following rules of three can be applied: if by reaction stoichiometry 2 moles of H₃PO₄ form 108 grams of H₂O, 0.002625 H₃PO₄ form how much mass of H₂O?

\(mass of H_{2}O=\frac{0.002625 moles of H_{3}PO_{4} x108 grams of H_{2}O}{2moles of H_{3}PO_{4}}\)

mass of H₂O= 0.14175 grams

Finally, 0.14175 grams of H₂O are formed when a 17.50 mL sample of a 0.150 M solution of H₃PO₄ reacts with excess Ba(OH)₂.

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Halogenation, Nitration, Sulfonation, Friedel-Crafts acylation, Friedel-Crafts alkylation, Oxidation of methyl group, Reduction of nitro group are  distinct chemical reactions involving organic compounds.

Using Halogenation, Nitration, Sulfonation, Friedel-Crafts acylation and alkylation, Oxidation of methyl group and Reduction of nitro group, benzene, toluene, or phenol can be synthesized in the following ways:

1. Halogenation: Benzene, toluene, or phenol can be halogenated by reacting them with a halogen (e.g., chlorine or bromine) in the presence of a Lewis acid catalyst.

For example, benzene can be chlorinated to form chlorobenzene using FeCl3 as a catalyst.

2. Nitration: Nitration of benzene, toluene, or phenol involves the substitution of a nitro group (-NO2) onto the aromatic ring.

This reaction is typically carried out by treating the compound with a mixture of concentrated nitric acid and sulfuric acid. For instance, benzene can be nitrated to produce nitrobenzene.

3. Sulfonation: Sulfonation introduces a sulfonic acid group (-SO3H) onto the aromatic ring. It can be achieved by reacting benzene, toluene, or phenol with concentrated sulfuric acid.

For example, benzene can be sulfonated to form benzenesulfonic acid.

4. Friedel-Crafts acylation: Friedel-Crafts acylation involves the reaction of benzene or toluene with an acyl chloride in the presence of a Lewis acid catalyst, such as aluminum chloride (AlCl3).

This reaction results in the formation of an aromatic ketone. For instance, benzene can be acylated to produce acetophenone.

5. Friedel-Crafts alkylation: Friedel-Crafts alkylation allows the introduction of an alkyl group onto the aromatic ring.

It can be achieved by reacting benzene or toluene with an alkyl halide in the presence of a Lewis acid catalyst. For example, benzene can be alkylated to form ethylbenzene.

6. Oxidation of methyl group: Toluene contains a methyl group attached to the aromatic ring, which can be oxidized to a carboxylic acid.

This can be accomplished by treating toluene with a strong oxidizing agent, such as potassium permanganate (KMnO4) or chromic acid (H2CrO4).

The oxidation of the methyl group in toluene results in the formation of benzoic acid.

7. Reduction of nitro group: Nitro groups (-NO2) can be reduced to amino groups (-NH2) by various reducing agents, such as hydrogen gas in the presence of a metal catalyst (e.g., palladium, Pt).

For example, nitrobenzene can be reduced to aniline (phenylamine) by catalytic hydrogenation.

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A mixture of gases contains 12. 0 grams of n2 and 15. 0 grams of ar, under a total pressure of 1. 32 atm. What is the partial pressure of n2?.

The partial pressure of n2 in the mixture of above gases is 0.7atm.

What is partial pressure?

Each gas in a mixture of gases has a partial pressure, which is the pressure that would exist if that gas alone had filled the complete volume of the original mixture at the same temperature.

N=12.0, Ar=15.0

Total pressure=1.32

Partial pressure of n2=?

WN2=12.0

WAr =15.0

nN2=12/28 =0.42

nAr=15/40 =0.37

Xn2=0.42/0.42+0.37 =0.53

Pn=Xn2×Ptotal

=0.53×1.32=0.69atm that ie nearly equal to 0.7atm

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this is the answer, but check the calculations first and see if it matches 0.300 mol/Ls

The following statements correctly describe the effect of molecular polarity  is a) The physical properties of a molecular compound are directly related to molecular polarity.

b) A polar compound will experience stronger intermolecular forces than a non polar compound.

The following statements correctly describe the effect of molecular polarity on the behavior of a molecular compound are :

a) The physical properties of the  compounds is depends on the physical properties of the molecular compound such as the boiling point , the melting point , the solubility etc.

b) The polar compounds will have the stronger force of intermolecular attraction ,  the boiling point of the polar compound is high that's means it has strong intermolecular forces.

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Answer:

nonmetal

Explanation:

correcto answers only

According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds. 

Thus,  When speaking of polyatomic ions, the distinction between them and ions is frequently ignored in the fields of quantum physics, organic chemistry, and biochemistry.

A molecule can be heteronuclear, which is a chemical compound made up of more than one element, such as water (two hydrogen atoms and one oxygen atom; H2O), or homonuclear, which is a molecule made up of atoms of one chemical element, such as the two  molecule in the oxygen molecule (O2).

The term "molecule" is frequently used to refer to any gaseous particle, regardless of its composition, in the kinetic theory of gases.

Thus, According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds. 

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There are 4,000 parts per million (ppm) of chlorine in the pool.

To calculate the parts per million (ppm) of chlorine in the pool, we can use the formula:

ppm = (part / whole) x 1,000,000

In this case, the part is the amount of chlorine, which is given as 8 g, and the whole is the amount of water, which is 2,000,000 g. Substituting these values into the formula, we get:

ppm = (8 g / 2,000,000 g) x 1,000,000

Simplifying this expression, we find:

ppm = (4 x 10^-6) x 1,000,000

ppm = 4,000

This means that for every one million parts of the pool's water, there are 4,000 parts of chlorine. In other words, the concentration of chlorine in the pool is 4,000 ppm, indicating a relatively high level of chlorine compared to the water.

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Answer:

even though the particles of a liquid are moving, they are attracted to each other so they don't spread far apart to become a gas.

Explanation:

"but some do when they evaporate"

In liquids, the particles are allowed to move freely rather than the solid. The gaseous particles can move more freely than liquids.

In liquids, the particles are placed randomly and thus are allowed to move freely but they do not become a gas as liquids are slightly less compressible than gases.  Even though the particles of a liquid are moving, they are attracted to each other so they don't just spread far apart to become a gas.

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The correct answer is c. sarcoplasmic reticulum. Ca2+ ions, which are essential for muscle contraction, are stored in the sarcoplasmic reticulum (SR) of muscle cells.

The sarcoplasmic reticulum is a specialized network of membranous sacs within muscle fibers, specifically designed for the storage and release of calcium ions during muscle contraction.

When a muscle is stimulated, an action potential triggers the release of stored Ca2+ ions from the sarcoplasmic reticulum into the sarcoplasm, the cytoplasm of muscle cells. The influx of Ca2+ ions into the sarcoplasm initiates a series of events leading to muscle contraction.

The sarcoplasm refers to the cytoplasm of muscle cells, the sarcolemma is the plasma membrane of muscle cells, and T-tubules are invaginations of the sarcolemma that help transmit the action potential deep into the muscle fiber.

Therefore, the correct location where Ca2+ ions are stored for muscle contraction is the sarcoplasmic reticulum (c).

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The balanced half-reactions are given below:

A. Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

Half-reactions refers to either of the two reactions in a redox reaction.

A redox reaction is a reaction in which oxidation and reduction occur simultaneously and to the same extent.

Oxidation reaction involves a loss of electrons while reduction reaction involves a gain of electrons.

The balanced half-reactions are given below:

A. Mo³⁺ (aq) → Mo(s) ( in acidic solution)

This is a reduction reaction:

Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) → SO₄⁻ (aq) (acidic solution)

This is an oxidation reaction

H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) → NO (g) (acidic solution)

This is a reduction reaction

NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) → H₂O (l) (acidic solution

This is a reduction reaction

O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

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Answer:

x = 25.02 or 25°c

Explanation:

Given:

mass of water : 7.50×10² =750 gm

Ccal = 8.20× 10² = 820 J/°c

Let assume final temp = x°c

then, heat gained by the water + heat gained by calorimeter

= 25400 J

⇒ Mw × Cw× ΔTw+ Ccal ×ΔT = 25400

⇒ 750× 4.184 × (x - 18.6) + 820 ×(x-18.6) = 25400

⇒ x = 25.02 or 25°c

The transfer of heat that occurs when 1.31 mol H2 reacts with 0.624 mol O2 is an exothermic reaction, where the reactants release energy as heat. This heat is absorbed by the product and can be used to do work.

When 1.31 mol of H2 reacts with 0.624 mol of O2, heat transfer occurs through an exothermic reaction. Heat is released by the reactants as they react and form a new product.

This release of heat is called the enthalpy of reaction (ΔH).

When the reactants form a product, energy is released from the reactants as heat. This heat is absorbed by the product. This heat transfer can be seen in an energy diagram for the reaction.

The energy released in the reaction can be used to do work. Heat transfer occurs in the form of kinetic energy, which is the energy of motion. This kinetic energy can be used to do work, such as powering machinery.

Heat transfer is important in many chemical and physical processes, such as cooking and cooling.

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The half-reactions for a galvanic cell with Zn and Ni electrodes are,

Zn(s) → Zn2+(aq) + 2e- (oxidation half-reaction) and Ni2+(aq) + 2e- → Ni(s) (reduction half-reaction)

The correct option is option D. Zn(s) → Zn2+(aq) + 2e and Ni2+(aq) + 2e → Ni(s).

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