the c―h bond in acetone, (ch3)2c═o, has a pka of 19.2. draw two resonance structures for its conjugate base. then, explain why acetone is much more acidic than propane, ch3ch2ch3 (pka

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 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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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.

The diameter of 150 ml container has more space and so its exposed, so it evaporates more quickly in lesser time.

Reason can be described as, 150 mL container is with 12 cm diameter evaporates faster because its surface area is larger and it has more number of water molecules on the surface. So, it has greater vapour pressure than the 75 ml container and the water also evaporates faster due to large surface area and more exposure.  

So, that the vapour pressure occurs between the molecues.

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When a chemist did an experiment to find out if fluorine reacts with xenon. The two gases were mixed in a glass container. The only product detected was silicon fluoride because fluorine reacted with silicon from glass.

All of the halogens strongly react with silicon to generate silicon tetrahalides. In order to create silicon(IV) fluoride, it combines with the elements fluorine (F2).Silicon tetrafluoride, also known as tetrafluorosilane, is a chemical compound having the formula SiF4.

The small liquid range of this colorless gas is noteworthy; the difference between its melting and boiling points is only 4°C. It was initially created in 1771 by Carl Wilhelm Scheele, who dissolved silica in hydrofluoric acid. John Davy later created it in 1812. Silicon tetrafluoride is a corrosive, tetrahedral molecule.

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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 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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There is a cinder block on a 20-meter-high platform. If it has a mass of 8 kg The energy is 1568 joules.

a numerical representation of the fundamental characteristic of all matter, inertia. In essence, it's the resistance of a mass of matter to changing its direction or speed in reaction to the application of a force. The more mass a body possesses, the smaller the change that is brought about by an applied force.

The formula F = m a, where F is force, m is mass, and an is acceleration, can be used to calculate mass. Determine the force, which is equivalent to weight, the acceleration, which is equivalent to gravity, and the mass.

mass= 8 kg

height= 20 m

acceleration= 9.8

The energy can be calculated as follows

= mgh

= 8×9.8×20

= 1568

The energy is 1568 joules.

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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 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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After completing the reaction, the number of neutrons generated is 2 neutrons.

What are neutrons in an atom of the reaction?

The neutron is an elementary particle that goes by the letters n or n0. It has a neutral charge—one that is neither positive nor negative—and a mass that is somewhat higher than that of a proton. Protons and neutrons make up the atom's nucleus. Due to their comparable functions inside the nucleus and masses of around one atomic mass unit, protons and neutrons are both referred to as nucleons.

Neutron generators, research reactors, and spallation sources are examples of dedicated neutron sources that generate free neutrons for use in neutron scattering and irradiation investigations.

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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:

Alkylation of ethyl acetoacetate followed by decarboxylation could not produce base.

What is alkylation?

By nucleophilic assault on a haloalkane, the conjugate base is alkylated. The alkylated acetoacetate is hydrolyzed, which causes the keto acid to be decarboxylated and produces a ketone. The alkylated malonate ester undergoes hydrolysis, which results in the diacid's decarboxylation and acid's production.

Alkylation is a chemical process whereby an alkyl group is added to or substituted onto a molecule of an organic substrate. Alkane molecules without hydrogen atoms are referred to as alkyl groups. For instance, the removal of a hydrogen atom from methane produces methyl groups, the most basic type of alkyl.

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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 statement that is not true about molecules and compounds is compounds are made up of the same type of atom. The correct option is A.

In chemistry, molecules and compounds are fundamental ideas. Two or more atoms that are chemically linked together make up a molecule.

A specific class of molecule known as a compound is made up of various atom types that are chemically combined in predetermined ratios.

As the fundamental units of matter, atoms make up all molecules and compounds. However, it is untrue to say that all compounds contain the same kind of atom.

While molecules can be made up of atoms from the same element or from different elements, compounds are created by the mixing of various types of atoms.

Thus, the correct option is A.

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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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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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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 notation type below is nuclide.  

In 141 Ce we have 58 protons, 83 neutrons and in  140 Ce we have  58 protons and  82 neutrons.

An isotope of a chemical element is any of two or more species of atoms that have almost similar chemical properties, the same atomic number, location in the periodic table, and different atomic masses and physical properties. Every chemical element has one or more isotopes.

Two subatomic particles known as neutrons and protons are found in the nucleus of every atom. The only exception is hydrogen, which contains one proton in its nucleus. Neutrons are somewhat heavier than positively charged protons and have an electric charge that is neither positive nor negative.

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Neutralizing them: FALSE.

Acids hp in the digestion of proteins by ;

NEUTRALISING THEM: FALSE.

PARTIALLY DENATURATING THEM: TRUE beacuse acids denature proteins and make them to lose their activity

PREVENTING THEIR ABSORPTION: FALSE

CLEAVING PEPSINOGEN:: TRUE pepsinogen os cleaved and then converted into active pepsin, which converts proteins into peptones and peptides.

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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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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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By graphing periodic properties we can identify that which compounds lies in which period or group and what are their properties.

  In, modern periodic table , we can able to identify the no. of electron an atom can fill .helps in giving the position of players . their role , physc chemical properties.

Thus, from the above conclusion we can say that, by graphing periodic properties we can identify that which compounds lies in which period or group and what are their properties.

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

ANSWER

a piano

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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If a reaction takes several days to occur without an enzyme it can occur in a few seconds with an enzyme.

What are enzymes?

Enzymes are proteins that hasten chemical reactions and act as biological catalysts. Substrates are the substances that interact with enzymes, and the enzyme changes the substrates into products, which are other molecules. The majority of cellular metabolic activities must use enzyme catalysis to go forward at rates fast enough to sustain life. An enzyme is a type of biological catalyst that is typically always a protein. It quickens a certain chemical process in the cell. During the reaction, the enzyme is continuously used and is not destroyed.

Thus, If a reaction takes several days to occur without an enzyme it can occur in a few seconds with an enzyme.

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If two versions of the same element have different numbers of electrons, at least one must be an ion.

Isotopes are the atoms of same element that have different number of neutron in them but same number of protons and electrons in them.

Isobars are the elements of different elements having same mass number but different atomic number.

But if the elements are same and the number of protons and neutrons are same but they have different number of electrons in them then they are atoms and ions.

Ions can be divided into cations and anions.

If the number of electrons in the ion is more than the number of electron in its atomic form then it forms an anion.

If the number of electron in the ion is less than the number of electrons in its atomic form then it forms a cation.

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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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a = 0, b = 0 and c= 1

Carbon a has 3 bonds with carbon and no hydrogen, carbon b has 4 bonds with carbon and no hydrogen and carbon c has only 1 bond with carbon and 3 bonds with hydrogen

Carbon is a chemical element with symbol C and atomic mass 6.

It is a chemical building block of all the life on earth. It is widely distributed forming organic compounds when combined with hydrogen, oxygen, nitrogen etc.

Carbon can easily form bond with hydrogen and oxygen atoms

Thus, a = 0, b = 0 and c= 1

Carbon a has 3 bonds with carbon and no hydrogen, carbon b has 4 bonds with carbon and no hydrogen and carbon c has only 1 bond with carbon and 3 bonds with hydrogen.

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Your question is incomplete, but probably your complete question was

in each box, write the number of H's that each labeled carbon has. for example, if the carbon next to the letter a has 3H's write in the box marked a.

The image is attached