21.47 what alkyl halides are needed to prepare each ketone using the acetoacetic ester synthesis?

Answer: How The World Works

Explanation: Our world is made out of atoms, molecules and ions. Their behavior determines the properties of the substances we encounter in our daily lives: their structure, color, smell, and the way they interact with each other.

Explanation:

one mole contains Avogadro number of particles

So,

40g( the atomic mass) contains 6.023× 10^23 atoms.

so 1 g contains 40÷(6.023×10^23)

so, 52.3 g contains (40×52.3) ÷6.023×10^23

= 3.47× 10^-21

Answer:B

Explanation:

.

The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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The component depicted in the red box would be the reactants in the chemical equation 2 H2 + O2.  In this instance, the reactants are hydrogen gas (H2) and oxygen gas (O2).

A substance or molecule that takes part in a chemical reaction is known as a reactant. During the reaction, the initial substance experiences a chemical change. In the process, reactants are consumed and changed into products.

A chemical reaction is the process by which one or more chemicals, referred to as reactants, change to create one or more new compounds, referred to as products. The bonds between atoms are broken and rearranged during a chemical reaction, creating new compounds with various chemical characteristics. Atoms are neither generated nor destroyed during a chemical reaction, and the total mass and energy remain constant.

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The document along with the initial capabilities document is Materiel Solution Analysis phase, Technology Maturation and Risk Reduction, the Engineering and Manufacturing, Production and Deployment, and finally Operations.

In order to close a particular capability gap, the Initial Capabilities Document (ICD) outlines the requirement for a material strategy or an approach that combines materiel and non-materiel.  An operational user's first examination of material methods and, if necessary, a separate analysis of material alternatives are used to determine a capability gap.

It outlines the capacity gap with respect to the functional domain, the applicable military operations' scope, intended outcomes, and time. The Doctrine, Organisation, Training, Materiel, Leadership, and Education, Personnel, and Facilities (DOTMLPF) study is summarised in the ICD, which also explains why it was determined that non-material improvements alone were insufficient to completely provide the capacity.  A Materiel Development Decision (MDD) entry requirement is a verified ICD.

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In a positive ion, the number of protons remains the same as the original atom, but there are fewer electrons. On the other hand, in a negative ion, the number of protons also remains the same, but there are more electrons.

In a positive ion, the number of protons exceeds the number of electrons and this results in an overall positive charge because protons carry a positive charge (+1) while electrons carry a negative charge (-1).

In a negative ion, the number of electrons exceeds the number of protons and this results in an overall negative charge because there are more negatively charged electrons (-1) than positively charged protons (+1).

So, it can be concluded that positive ion has fewer electrons as compared to protons whereas negative ion has more electrons as compared to protons.

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Answer:

energy transformation

Explanation:

energy transformation is when energy changes from one form to another. like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy.

The VSEPR theory states that the ClO3 ion's pyramidal geometry results from the presence of one lone pair and three bond pairs, which cause sp3 hybridization.

What is VSPER Theory?

From the electron pairs that surround the core atoms of the molecule, the VSEPR theory is utilised to predict the shape of the molecules. Sidgwick and Powell initially introduced the theory in 1940. The VSEPR theory is predicated on the idea that the molecule will adopt a form that minimises electronic repulsion in that atom's valence shell.

The VSEPR hypothesis, also known as the "Valence Shell Electron Pair Repulsion Theory," is based on the idea that all atoms have a repulsion between their pairs of valence electrons,

The valence shell electron pair repulsion (VSEPR) theory is a model that predicts the 3-D form of molecules based on the amount of valence shell electron bond pairs that exist between the atoms in a molecule or ion. This theory predicts that electron couples will arrange themselves to minimise the effects of their mutual repulsion. The electron pairs are, to put it another way, as far apart as they can be.

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In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the cathode; the chemical change that occurs at this electrode is called reduction.

An electrolyte is a material that separates into charged ions when it is in contact with water. Cations are positively charged ions. Anions are ions that are negatively charged. A substance that may conduct an electric current when melted or dissolved in water is known as an electrolyte.

There are three main categories of electrochemical cells. the galvanic cell, the concentration cell, and the electrolytic cell. These cells all share the same four fundamental components. These are the elements

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First, we define density as:

Density = mass/volume;

We focus first on the volume of air in the room.

Volume:

We have the measurements of where the air is.

We calculate the volume with these measurements, but first, we change the units to L:

1 inch = 2.54 cm

1 L = 10^3 cm^3

1 ft = 12 inch

Now,

11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm

12.0 ft = 365.76 cm

10.0 ft = 304.8 cm

Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm

Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L

From the Density equation, we clear the mass:

Density x volume = mass (g)

1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg

Answer: 44.5 kg

So,

There's an equation that we could use in order to find frequency, and it is the next one:

This equation tells us that the energy of the photon is equal to the product of the Plank constant (h), which is 6.626*10^-34 J.s, and the frequency.

In this problem, we know the value of E and the value of h, so we need to solve for v:

Therefore, the correct answer option is A.

Answer:

Its C

Explanation:

Ok. You really know how.

Answer:

the answer would be b

Explanation:

The time that is required to deposit 1.00 g of chromium metal is 30.9 mins.

Faraday's II Law of electrolysis states that if the equal quantity of energy is handed thru extraordinary electrolytes, the loads of ions deposited on the electrodes are without delay proportional to their chemical equivalents.

The chemical equation of the reaction can be represented as follows:

Cr6+ + 6e → Cr

Moles of Cr = mass / molar mass = 1 / 52 = 0.0192 mol

Moles of electrons needed = 6 * moles of Cr = 6 * 0.0192 = 0.1152 mol

Charge needed = moles of e * charge per mole of e = 0.1152 * 96485.33 = 11115.110 C

Now time needed = charge / current = 11115.110 / 6 = 1852.52 seconds = 1852.52 / 60 min = 30.9 min

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Answer:

There are 122.1982401 moles of  H2O in \(7.36*10^{25}\)  molecules of H2O

Explanation:

We know,

\(6.023*10^{23}\)  molecules of H2O contains 1 mole H2O

            1      molecules of H2O contains \(\frac{1}{6.023*10^{23}}\)  mole H2O

∴ \(7.36*10^{25}\) molecules of H2O contains \(\frac{1}{6.023*10^{23}}*(7.36*10^{25})\) moles of H2O

                                                               = 122.1982401 moles of  H2O

∴ There are 122.1982401 moles of  H2O in \(7.36*10^{25}\)  molecules of H2O

Answer:

pH ≈ 4.21

The acidity of a solution can be expressed as:

pH = -log₁₀[H⁺] = -log₁₀[H₃O⁺]. Historically, pH is an acronym for "potential of Hydrogen". The scale goes from 1 to 14, where acidic solutions are measured to have lower pH values than basic or alkaline solutions. a pH of 7 represents a neutral solution. Pure distilled water has a pH of 7, whereas drinking water has a slightly greater pH than 7, due to the chemicals added to eliminate harmful bacteria.

Generally, in calculating pH, we use the formula: pH = -log₁₀[H⁺], where [H⁺] = concentration of hydrogen ions. However, sometimes the formula pH = -log₁₀[H₃O⁺] may also be used where [H3O+] = hydronium ion concentration. The hydronium ion is basically just the H⁺ ion released that bonds with the H₂O molecule to form H₃O⁺. The two above formulas can be used interchangeably.

To calculate the pH of a solution with [H₃O⁺] = 6.19×10⁻⁵ M:

pH = -log₁₀(6.19×10⁻⁵) ≈ 4.208

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Answer:

Baking soda is an alkaline, or base, substance. This means that when we dissolve baking soda in water, it forms an alkaline solution. For example, a 0.1 molar solution of baking soda has a pH of around 8.3. Lemon juice contains citric acid and has a pH of around 3.

To determine the number of grams of sulfur dioxide formed when 10.0 mol of copper(I) sulfide reacts during the process of roasting, we need to use the balanced chemical equation and the molar masses of the compounds involved.

The balanced chemical equation for the reaction of copper(I) sulfide (Cu2S) with oxygen (O2) to form copper(I) oxide (Cu2O) and sulfur dioxide (SO2) is:

2 Cu2S + 3 O2 → 2 Cu2O + 2 SO2

From the balanced equation, we can see that for every 2 moles of Cu2S, 2 moles of SO2 are formed.

Therefore, using the stoichiometry of the reaction:

10.0 mol Cu2S * (2 mol SO2 / 2 mol Cu2S) = 10.0 mol SO2

Next, we can calculate the mass of sulfur dioxide using the molar mass of SO2, which is approximately 64.06 g/mol:

Mass of SO2 = 10.0 mol SO2 * 64.06 g/mol

= 640.6 g

Therefore, when 10.0 mol of copper(I) sulfide reacts during roasting, approximately 640.6 grams of sulfur dioxide are formed.

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Answer:

One atom must be much more electronegative than the other.

Among the following species, HI has the least polar bond.

Polar covalent bond: The bond formed between two atoms having difference in electronegativity by sharing electrons.

Electronegativity is the tendency of an atom to attract electrons toward it and the trend of electronegativity in the modern periodic table is it generally increases as you move from left to right across a period and decreases as you move down a group.

Now, compared to HF, HCl, HBr, and HI the electrons shared between the atoms hydrogen and iodine are weak because iodine is a 5th-period element and has the least electronegativity hence the least polar bond between hydrogen and iodine molecule.

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A buffer is made from an acid - base conjugate pair as shown by option A

Buffers are often composed of weak acids and their conjugate bases (or weak bases and their conjugate acids). The weak acid can contribute a proton to balance any new base, whereas the conjugate base can absorb a proton to do so.

This balance between the acid and its conjugate base allows the buffer to survive pH changes. Buffers are essential in biological systems because many biochemical processes are particularly sensitive to pH changes.

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Answer:

option B it was captured by earth's gravity

Explanation:

please Brinlmark me please

We emphasize the valence electrons in an atom when discussing atomic properties, as they are most accessible to other atoms.

The valence electrons are the electrons that are present in the outer shell of the atoms. These electrons are free for making bonds with the electrons of other atoms.

Electrons are joined with other electrons to make a compound. These electrons are shared by or gained by other atoms.

Thus, when discussing atomic qualities, we focus on the valence electrons in an atom since they are the most receptive to other atoms.

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Neptunium-237 undergoes alpha decay to form d. ²³³₉₁Pa + ⁴₂He.

Alpha decay is a nuclear decay technique in which an unstable nucleus adjusts to any other element by using taking pictures of a particle composed of two protons and two neutrons. This ejected particle is referred to as an alpha particle and is actually a helium nucleus. Alpha particles have a surprisingly big mass and a wonderful price.

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and thereby transforms or decays right into a different atomic nucleus, with a mass number this is reduced via 4 and an atomic number that is decreased through.

Alpha decay takes place when a nucleus is unstable because it has too many protons. The figure underneath suggests what occurs all through alpha decay. The nucleus emits an alpha particle and electricity. An alpha particle consists of protons and neutrons, which is virtually a helium nucleus.

Disclaimer:- Your question is incomplete, please see below for the complete question.

Neptunium-237 undergoes alpha decay to form what daughter isotope and decay particle?

a. ²³³/₉₁Pa + ⁴/₂He

b. Pa²³³/9 + He⁴/²

c. Pa₉₁²³³ + He⁴₂

d. ²³³₉₁Pa + ⁴₂He

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Using DNA recombinant technology, scientists combine the Gfp gene with another gene that generates a protein they wish to study, and then they introduce the resulting complex into a cell. If a cell produces the green fluorescence, scientists assume that it is expressing the target gene.

What is the most likely result of expressing this chimeric gfp in a cell that is otherwise healthy?

Because it retains its fluorescent properties when recombinantly expressed in both prokaryotic (Escherichia coli) and eukaryotic (Caenorhabditis elegans and Drosophila melanogaster) living cells, the green fluorescent protein (GFP) of the jellyfish Aequorea victoria can be used as a potent marker of gene expression in vitro cell.

The essential amino acids include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The non-essential amino acids are alanine, asparagine, aspartic acid, glutamic acid, and serine.

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The Gfp gene is joined to another gene that produces an intriguing protein using DNA recombinant technology, and the resulting complex is then introduced into a cell. Scientists presume that a cell is actively expressing the target gene if it exhibits the green fluorescence.

The green fluorescent protein (GFP) of the jellyfish Aequorea victoria can be used as a strong marker of gene expression in vitro cells because it maintains its fluorescent properties of when it is recombinantly expressed in both prokaryotic (Escherichia coli) and eukaryotic (Caenorhabditis elegans and Drosophila melanogaster) like living cells.

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45,849 calories are given off when 85 gram of steam condenses to liquid water.

Vaporization is always a highly endothermic (heat-absorbing) process because you must break all the intermolecular interactions present inside of the liquid phase.

So,

Q = mass × heat of vapourization

Q = m×ΔH\(_{vap}\)

Q = 85 × 539.4

Q = 45,849 cal

Therefore, 45,849 calories are given off when 85 gram of steam condenses to liquid water.

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The number of electrons, protons, and neutrons in argon is 18, 18 , and 22 respectively, the number of electrons , protons and neutrons in sulphur-32 is 16, 16, 16 respectively. The number of protons, neutrons, and electrons are 6 , 8 and 6. And for uranium-238 , 92 protons , 92 electrons and 146 neutrons.

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