What is the ph of a solution that results from adding 0.059 mol naoh (s) to 1.47 l of a buffer comprised of 0.391 m benzoic acid, c6h5cooh and 0.391 m sodium benzoate, c6h5coona?

Answer:

The Lewis dot structure for H is H, while the Lewis dot structure for He is He. The difference is due to the different number of valence electrons in each atom. H has one valence electron, while He has two valence electrons.

Explanation:

The explanation for this is that, according to the octet rule, atoms will tend to form bonds until they have eight valence electrons around them. H only has one valence electron, so it can only form one bond. He, on the other hand, has two valence electrons, so it can form two bonds.

on which object will earth gravity act with the greatest magnitude?

ANSWER

a piano

Compounds can be created by chemically combining elements, hence a compound is made up of two or more elements combined in specific ratios. Ionic or covalent bonds between the atoms of constituent elements can be used to create compounds.

What are substances, exactly?

A matter with certain qualities and makeup is referred to as a substance. Every pure element and compound counts as a substance. Pure substance made of hydrogen and oxygen is called water, or H2O. Each homogenous pure substance exists.

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The specific volume of the sample is 0.018 ft³/ lb. And the density of the sample is 55.5 lb/ ft³.

A specific volume of a substance is defined as the ratio of its volume to its mass. It is the reciprocal of the density of a substance. Whereas density is defined as the ratio of the mass of the substance to its volume. SI unit of specific volume is m³ per kg. SI unit of density is kg / m³.

The mass of the sample = 2 lb

The volume of the sample = 62.6 in³

The specific volume of the sample is,

[tex]Specific\ volume = \frac{mass}{volume}\\\\Specific\ volume = \frac{V}{M}[/tex]

[tex]Specific\ volume = \[\frac{62.6}{2\times {{\left( 12 \right)}^{3}}}\]\[/tex]

[tex]Specific\ volume = 0.018\ ft^{3}/lb[/tex]

The specific volume of the sample is 0.018 ft³/ lb.

The density is the inverse of specific volume.

So, the density of the sample is,

[tex]Density = \frac{1}{specific\ voume}\\\\Density = \frac{1}{0.018} \\\\Density = 55.5\ lb/ft^{3}[/tex]

Thus, the density of the sample is 55.5 lb/ ft³.

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The product that is produced during fermentation reactions (lactic acid fermentation or ethanol fermentation) and the electron transport chain is NAD+.

Throughout the process anaerobic glycolysis the two molecules of NADH that are bring back to their oxidized form NAD+ in the method of the fermentation. So the reclamation of glycolysis-related NADH is filled up. The method of aerobic respiration produces six molecules of NADH that being bring back into NAD+ form throughout the process of oxidative phosphorylation.

Fermentation abide by the glycolysis in the absenteeism of oxygen. Alcoholic fermentation generates ethanol, carbon dioxide, and NAD+. Lactic acid fermentation generates lactic acid (lactate) and NAD+.

Hence, in the conclusion NAD+ will be produced.

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The negative charge on each oxygen of the carbonate ion is -0.67 among the given options.

In this problem, when we look at the carbonate ion, firstly we need to look at how much negative charge is carried on the oxygen. Carbonate ion, (CO₃)²⁻ has two negative charges and there are three oxygen. So, -0.67 is the charge on each oxygen of carbonate ion.

Since, there are three oxygen in a carbonate ion, charge is divided as -

                   O                   O⁻                 O                  O⁻

                   ║                    |                    ║                   |

                   C          ↔      C        ↔       C     →          C

                 /    \                /    \\              /    \              /   \

              ⁻O     O⁻       ⁻ O     O         ⁻O    O⁻       ⁻O    O⁻

Negative charge for each oxygen will be -

-2/3, because two negative charges are divided by 3 oxygen.

Therefore, negative charge on each oxygen = -2/3 = -0.67

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As mixed acids continue to be catabolized to produce the neutral product, the methyl red test is used to gauge the pH shift from 4.4 to 6.0.

The pH scale is used to determine an aqueous solution's acidity or basicity. Historically, pH stood for "potential of hydrogen" (or "power of hydrogen"). In comparison to basic or alkaline solutions (solutions with higher concentrations of H+ ions), acidic solutions have lower pH values measured.

The hydrogen ion concentration in the solution is inversely proportional to the pH scale's logarithmic scale. The origin of the pH scale can be traced to a collection of standard solutions whose pH has been established by consensus on a global scale. Utilizing a concentration cell with transference, the primary pH standard values are computed by measuring the potential difference between a hydrogen electrode and a standard electrode, such as the silver chloride electrode.

Methyl red is a pH indicator with a pKa of 5.1; it is red at pH values below 4.4, yellow at pH values over 6.2, and orange at pH values in the middle. As potential boosters of the sonochemical annihilation of chlorinated hydrocarbon contaminants, murexide and methyl red are being studied.

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The charges are;

A charge is a specie that has a positive or a negative charge. We know that in chemistry, an atom could acquire a charge by the loss or gain of an electron. We now want to see the kind of charge that is formed from the spices as shown in the question.

Thus, according to the groups that the elements belong;

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Natural resources are those that are accessible without human intervention. Like the sun, the atmosphere, the air, the water, the land, the mines, the vegetation, and animal life.

Renewable resources :

Non Renewable resources :

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The cobalt ion is paramagnetic.

The shape of compounds with six atoms or groups of atoms or ligands symmetrically grouped around a central atom, defining the vertices of an octahedron, is described by octahedral molecular geometry, also known as square bipyramidal, in chemistry.

High spin electrons will occupy the d orbitals as if they were degenerate when  Δ is small because the pairing energy is greater than the splitting energy. How little or huge is  Δ also depends on the metal's oxidation state.

[Co(NH₃ )₆ ​]⁺ Due to the existence of an unpaired electron and a high field ligand, the ion 2+ exhibits paramagnetic behavior (low-spin complex). Co is a d⁷ electron system since it is in the +2 oxidation state in this instance. All electrons pair together in the presence of a strong ligand, leaving one electron unpaired.

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To obtain 0.250g of silver nitrate, we make a solution of 0.00147M of 1L.

What is a hollow glass stoppered reagent bottle?

Product has a narrow mouth and a replaceable hollow hexagonal glass stopper. Reagent bottles are borosilicate glass containers with unique glass stoppers on top. They are also known as media bottles or graduated bottles. They are designed to hold chemicals for laboratories in liquid or powder form, where they will be housed in cabinets or on shelves.

Mass of silver nitrate (solute): 0.250g

Moles of silver nitrate: 0.00147

Molarity of the solution: 0.00147M

So to obtain 0.250g of silver nitrate, we make a solution of 0.00147M of 1L.

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The answer would be 25% remains left i.e., a radioactive substance has a half life of 5000 years, if the original sample contained 20 grams of the radioactive isotope, 25% will remains after 5000 years elapsed.

In this question (t1/2) is 5000 years , which refers that after 5000 years is half of the sample would have decayed and half would be left as it is.

Given , 20 g sample .

After 5000 years ( first half life) 20/2 = 10 g decays and 10 g remains left.

Two half lives or 5000 years 10 /2 = 5 g decays and 2.5 g remains left .

so we started with 20 g and after 5000 years 5 g of the sample will be left not decayed.

Percentage of sample left = mass of sample left x 100 / original mass of sample

Percentage of sample left = 5 g x 100 / 20g = 25 %

In conclusion, 25% remains after 5000 years have elapsed.

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The oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) and the oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water).

Oxidation is that the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation number of a molecule, atom or ion is increased. the other process is called reduction, which occurs when there's a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.

The term oxidation was first employed by Antoine Lavoisier to signify the reaction of a substance with oxygen. Much later, it had been realized that the substance, upon being oxidized, loses electrons, and therefore the meaning was extended to include other reactions in which electrons are lost, no matter whether oxygen was involved.

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Analyze the effectiveness of binary similarity techniques for identifying compounds in untargeted metabolomics.

What is mass spectrometry metabolomics?

Many thousands of metabolite characteristics can be simultaneously detected and quantified using mass spectrometry-based metabolomics methods. However, because of the metabolome's chemical complexity and wide dynamic range, compound identification and accurate quantification are far more difficult.

Many thousands of metabolite characteristics can be concurrently detected and quantified using metabolomics technologies based on mass spectrometry. Due to the metabolome's chemical complexity and dynamic range, molecule identification and accurate quantification are, nonetheless, extremely challenging tasks.

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The density of an unknown metal object if its mass is 53.72 g and it displaces 7.9 ml of water is 6.8 g/mL.  

Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.

In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.

According to the question,

The mass of the metal object = 53.72 g.

The volume of the metal object = 7.9 ml.

The formula for calculating the density is as follows:

                      = 53.72 g / 7.9 ml = 6.8 g/mL.

Therefore, the density of an unknown metal object if its mass is 53.72 g and it displaces 7.9 ml of water is 6.8 g/mL.  

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1.  The empirical formula is ZnI₂.

2.  Balanced chemical equation for the reaction between zinc and iodine to form zinc iodide.

                   Zn + 2I → ZnI₂

3.  To find empirical formula, we have to do following steps.

    Step 1: Write given atoms.

    Step 2: Write given masses of corresponding  atoms.  

    Step 3: In next step atomic masses are written respectively.

    Step 4:Number of moles is calculated using,

              Number of Mole= Given mass/Molecular mass

    Step 5: Mole ratio is obtained by dividing with smallest mole.

Empirical formula of given problem is H₂O.

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Flammability, and the ability to corrode, are examples of J chemical properties.

The ability of a chemical to burn or ignite, resulting in fire or combustion, is referred to as flammability. Fire testing determines the degree of difficulties involved required to cause a chemical to burn. Materials are typically classified as highly flammable, flammable, or non-flammable.

A chemical property is any property of a material that emerges during or after a chemical reaction; that really is, any quality that can only be established by changing a substance's chemical identity. A chemical property is the ability or inability to change one type of matter into another. Chemical properties involve flammability, toxicity, acidity, reactivity (of various kinds), and heat of combustion.

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The true statements are: the K⁺ ion is formed when potassium loses one electron.

The Fe⁺² and Fe⁺³ ions have same number of protons.

1) The K⁺  ion is formed when potassium loses one electron.

When an atom loses one electron then it gets a positive charge on it that is why statement 1 is correct.

2) When an atom gains an electron, it becomes a cation.

When an atom gains an electron it becomes an anion so statement  2 is incorrect.

3) The Fe⁺² and Fe⁺³ ions have same number of protons.

Whenever an atom loses or gain electrons then they get charge on them but that changes the number of electrons present in it and not the number of protons in them. So, statement 3 is correct.

4) The Cu and Cu²⁺ ions have the same number of electrons.

When an atom gains electrons then the number of electrons in it changes. So, statement 4 is incorrect.

5) The Cl⁻ and Br⁻ ions have the same number of electrons.

They do not have same number of electrons so it is incorrect.

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The mass of chlorine required to react with 10.0 g of sodium metal to produce sodium chloride is 15.26 g.

The balanced chemical reaction is :

           2Na + Cl₂ → 2NaCl

Given data :

Mass of sodium = 10.0 g

Number of moles of Na -

Number of moles =  Given mass  

                                    Molar mass

Number of moles = 10.0 g = 0.43 mol

                                  23 g

Comparing moles of Na and Cl₂ from the balanced chemical equation,

                                            Na        :        Cl₂

                                             2          :         1

                                             0.43     :         1 x 0.43 = 0.215 mol

                                                                   2

Mass of chlorine gas :

          (molar mass of chlorine = 71 g)

Mass of chlorine = number of moles x molar mass

Mass = 0.215 mol x 71 g/mol

          = 15.26 g

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Molar solubility of Fe(oh)3 in a solution that is buffered at pH 2.50 is 2.0×10−3M.

A salt compound will dissolve in the liquid water by forming an aqueous solution of its constituent ions. The saturated solution has compound dissociation reaction in a solubility equilibrium and we define this state using the compound's solubility product constant Ksp . This parameter will only change with solution temperature. In contrast, compound's molar solubility limit in the saturated solution can be manipulated in numerous other methods. One example involves trying to dissolve an acidic/basic salt compound in a solution that is buffered at certain pH. The pH will control compound's molar solubility because it affects the molarity of the acidic/basic constituent ion in the solution.

Iron (III) hydroxide has following solubility equilibrium for its saturated solution with the given constant value:

Fe(OH)3(s)⇋Fe3+(a q)+3OH−(a q)

Ks p=6.3×10−38=[Fe3+][OH−]3

From the given pH we find hydroxide ion molarity:

pH=2.50

pOH=14.00−2.50=11.50[OH−]=10−pOH=10−11.50=3.2×10−12 M

It is assumed that the iron (III) hydroxide makes a negligible contribution to hydroxide ion molarity. We solve the expression for molar solubility of this compound x:

Ksp=6.3×10−38=(x)(3.2×10−12 M)3

x=2.0×10−3M

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The mass of oxygen gas released is 3.2grams.

From the above decomposition reaction, the chemical notation of reaction is given by,

2MgO = 2Mg + O₂

From above reaction, we can say that 2 moles or 80.6 grams of Mg decomposes to give 2 moles or 48.6 grams of Mg and 1 mole or 32 grams of O₂.

So 8.06 gram of MgO will give (8.06 × 32) / 80.6

= 3.2 grams of oxygen gas.

Thus the amount of oxygen gas released is 3.2grams.

Decomposition reaction occur when complex chemical entities breakdown into smaller components. Decomposition reactions often demand energy input.

The digestion of food in our bodies is a typical illustration of the decomposition response. Here, food components including proteins, lipids, and carbs will break down into a variety of easier and more compact parts.

Decomposition reaction is classified into three types, they are thermolysis, electrolysis and photolysis.

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The hydrophobic groups buried in the center that form in water are called  bilayer membranes

The lipid bilayer (or phospholipid bilayer) may be a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form endless barrier around all cells

The purpose of the bilayer membrane is to separate the cell contents from the outside environment. the surface of the cell is mostly water and the inside of the cell is mostly water

A cell wall is a bilayer because it is made up of 2 layers of lipids. The heads of the lipids are faced towards the opposites sides (the inside and out of doors of a cell) while the tail (the 2 fatty acids) are inside the layer facing each other

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The unit of measurement for specific heat is Joules per g times degree Celsius.

Similar to density, color, etc., specific heat is an intense feature that is independent of the amount of a substance present. This enables the use of heat specificity to identify compounds.

q = mcT, where q is the quantity of heat applied, m is the mass of the substance, c is its specific heat, and T is the temperature change.

Therefore, we can simply isolate the term in the calculation above to get c=qmT if we wish to find the units for specific heat.

We may calculate that c = JgC since heat is measured in Joules (J), mass in grams (g), and degree Celsius (C).

As a result, the unit of measurement for specific heat is Joules per g times degree Celsius.

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The pH of solution will reach upto 4.22 after bringing the solution to 1L.

The reaction is HCOOH + NaOH  ---->  HCOONa + H2O

What is pH?

Since the pH of a substance is essentially a measurement of the concentration of hydrogen ions (or protons), the letters pH stand for potential of hydrogen. Biologist Sren Peter Lauritz Srensen created the pH scale in 1923. (1868-1969).

Potential of Hydrogen is what pH is formally known as.The definition of pH as the quantity of hydrogen is given as the negative logarithm of the concentration of H+ ions. The hydrogen ion concentration in a solution is described by the pH scale, which also determines how acidic or basic a solution is.

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0.095grams of KOh is needed to neutralize 12.6 ml of 0.14m HCl in stomach.

Chemical reaction:

HCl + KOH → KCl + H2O

Moles HCl = molarity x volume

Moles HCl = 0.14 M x .00126 L

Moles HCl = 0.0017 moles

Calculate moles of KOH

For 1 mol of KOH, we need 1 mole of HCl to produce 1 mol of KOH and 1 mole of H2O

For 0.0017moles of HCl, we need 0.0017 moles of KOH.

Calculate the mass of KOH

Mass of KOH = moles x molar mass

Mass of KOH = 0.0017moles x 56.1 g/mol

Mass of KOH = 0.095g

Hence, 0.095 grams of KOH are needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

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To properly measure 20 ml of water, the 20 ml mark of the graduated cylinder must be at the meniscus.

We measure at the meniscus for what reason?

To have the "actual" volume be what is marked, the mark must be placed where the bottom of the meniscus should be on the glass. Therefore, by taking measurements from the bottom of the meniscus, you are harmonizing your measurement process with the method used to calibrate the markings on the glass in the first place.

The meniscus is what?

When a molecular substance (water, of course) comes into contact with another material, the surface forms a meniscus. You may imagine that happening with water when it adheres to the interior of a glass.

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The flavoring agent in club soda is the chemical potassium bicarbonate. This is an illustration of an emergent property because it is composed of potassium, carbon, hydrogen, and oxygen.

What is an emergent property?

An entity acquires an emergent attribute as it integrates into a larger system. Living things benefit from emergent qualities that enable them to survive by better adjusting to their surroundings.

By joining together to form the proteins, lipids, carbohydrates, and nucleic acids that comprise macromolecules, atoms like carbon, hydrogen, oxygen, and nitrogen found in molecules acquire new or emergent capabilities. Lipids are created, for instance, when particular combinations of carbon, hydrogen, and oxygen occur. Lipids have the ability to create cell membranes, which keep living cells isolated from their surroundings. Life could not exist without cell membranes, which are an emergent feature not present in the molecules that comprise them.

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Marathon is a 26.2 mile race that commemorates the run made by a Greek soldier, Pheidippides, that took place in 490 BC. He ran 41.9 kilometers.

The Greek soldier Pheidippides ran marathon of 26.2 miles.

So, the kilometers he ran -

1 mile = 1.6 km

26.2 mile = 1.6 x 26.2 km

                = 41.9 km

Why marathon is 26.2 miles?

Marathon is 26.2 miles long, as, the Queen Alexandra requested the race to be started from the lawn of the Windsor Castle, for the little royals to watch and to finish the race in front of the royal box of Olympic stadium, and the distance between lawn of castle and royal box was 26 miles and 385 yards.

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Answer:

41.9 km

Explanation:

I took the test.

Answer:

1568 Joules

Explanation:

MGH

Mass of 8kg time Gravity of 9.8 and Height of 20 meters

20*9.8*8

Answer: potential energy = mgh

8×20×10=1600joules

Explanation:

The diagram is in the given picture. Ketones are more reactive towards the base than aldehydes.

On using a base,  the bottom abstracts a proton from alpha hydrogen to form a carbanion. Carbanion formed is stabilized because the negative charge formed participates in resonance with the carbonyl group.

What is the carbonyl group?

A  group consists of a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares two of its six valence electrons with the carbonyl atom. Its remaining four valence electrons remain as two sets of electron lone pairs.

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