allylic bromination of methylenecyclohexane would be expected to give two isomeric monobromination products. identify the other isomer. multiple choice a b c d

Explanation: Sulphur trioxide forms Sulphur acid with water.

Phosphorus has unpaired electrons in 3p state

Answer: The answer is to receive stimuli from inside and outside the body.

Explanation:

The following is true about the total number of reactants and the total number of products in the reaction is : c) 2 molecules of reactants chemically change into 3 molecules of product

The reaction is given as :

2H₂O  ---->   2H₂   +   O₂

this is example of the decomposition reaction. according to the law of mass of conservation is that mass neither be created nor be destroyed.  in this reaction 2 moles of the water will be decompose into the two moles of hydrogen and the one mole of the oxygen. thus, the correct from the following option is (c ) that is  2 molecules of reactants chemically change into 3 molecules of product .

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Answer:

Explanation:

one mole of AgNO₃ reacts to inactivate one mole of enzyme

mg of enzyme in 10 mL = 3.4 x 10 mg = 34 mg .

required AgNO₃ = .134 x 10⁻⁶ mole

.134 x 10⁻⁶ mole AgNO₃ is required for inactivating 34 mg of enzyme

1 mole of AgNO₃ will be  required for inactivating 34 / (.134 x 10⁻⁶ ) mg of enzyme

= 253.73 x 10⁶ mg of enzyme

= 253.73 x 10³ g of enzyme

Mol weight of enzyme =  253.73 x 10³ .

The false statements about isotopes are options a) Radiopharmaceuticals contain specific isomer formulations and c) Isotopes are made by redox reactions.

a) Radiopharmaceuticals contain specific isomer formulations. This statement is false. Radiopharmaceuticals typically contain specific isotopes, not isomers. Isotopes refer to atoms of the same element with different numbers of neutrons, whereas isomers are different forms of the same molecule with the same chemical formula but different arrangements of atoms.

c) Isotopes are made by redox reactions. This statement is false. Isotopes are not created or made through redox reactions. Isotopes naturally occur or can be produced through various processes, such as radioactive decay, nuclear reactions, or isotopic enrichment methods.

b) Iodine-123 is an example of an isotope used in medical applications. This statement is true. Iodine-123 is indeed an isotope of iodine that is used in medical applications, particularly in diagnostic imaging of the thyroid gland using gamma cameras or single-photon emission computed tomography (SPECT).

d) Isotopes are important in nuclear medicine. This statement is true. Isotopes play a crucial role in nuclear medicine. Radioactive isotopes are used for various medical purposes, including imaging, diagnosis, and treatment of diseases such as cancer. For example, isotopes like technetium-99m and iodine-131 are commonly used in nuclear medicine procedures like positron emission tomography (PET) and radiotherapy.

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The question is incomplete. Find the full content below:

Choose the false statement(s) about isotopes. To be marked correct, you'll need to select all false statements, as there may be more than one correct answer.

a) Radiopharmaceuticals contain specific isomer formulations.

b) Iodine-123 is an example of an isotope used in medical applications

c)Isotopes are made by redox reactions.

d) Isotopes are important in nuclear medicine.

Answer:

something that is impossible

The net ionic equation shows that the reaction involves the transfer of a proton (H+) from water to hypochlorous acid (HOCl), forming hydroxide ions (OH-) and the hypochlorite ion (OCl-).

What is Ionic Equation?

An ionic equation is a chemical equation that shows only the species that actually participate in a chemical reaction, including ions and other charged particles. It is a simplified form of a chemical equation that omits the spectator ions, which are present in solution but do not participate in the reaction.

The chemical formula for barium hypochlorite is Ba(ClO)2. When it is dissolved in water, it hydrolyzes to form an acidic and a basic species, resulting in an acid-base equilibrium:

Ba(ClO)2(s) + 2H2O(l) ⇌ Ba(OH)2(aq) + 2HOCl(aq)

Ba2+(aq) + 2ClO-(aq) + 2H2O(l) ⇌ Ba2+(aq) + 2OH-(aq) + 2HOCl(aq)

The spectator ions in this reaction are Ba2+ and ClO-, which appear on both sides of the equation and can be canceled out. The net ionic equation shows that the reaction involves the transfer of a proton (H+) from water to hypochlorous acid (HOCl), forming hydroxide ions (OH-) and the hypochlorite ion (OCl-).

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Consider the model of a sodium atom. An orange circle labeled upper n a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. The distribution of electrons in different shells feature does the model show accurately.

Sodium is a chemical element with the atomic number 11 and the symbol Na (derived from the Latin natrium). It is a delicate, silvery-white metal that is exceedingly reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it.

The periodic table's chemical element sodium has the atom number 11 and the symbol Na (Natrium in Latin). Alkali metals include the soft, waxy, silvery sodium, which is a reactive metal that occurs frequently in natural substances (especially halite).

Alkali metal group (Group 1 [Ia]) element sodium (Na), according to the periodic table. The element sodium is a very delicate silvery-white.

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The complete question is ''Consider the model of a sodium atom. An orange circle labeled upper N a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. Which feature does the model show accurately?

A) the size of the electrons in different shells

B) the shapes of the orbitals in different shells

C)the distribution of electrons in different shells

D)the orientation of the orbitals in different shells

Density is the ratio of the mass to the volume of an object.

The density would have to do with the ratio of the quantity of matter to the volume of the matter. This is why the mathematical relatiosnhip of the density of the object is often written in the form of;

Density = Mass / Volume

Strong intermolecular interactions keep the particles of a solid locked in place and closely packed together. As a result of their particles' limited volume compared to their mass, solids have a high density.

Despite being closely packed, the particles in a liquid are not kept in a fixed location. Because their particles occupy a bigger volume compared to their mass, liquids have a lower density than solids because they can move around and glide past one another.

A gas has widely spread, randomly moving particles that flow in all directions. As a result of their particles' huge volume compared to their mass, gases have a very low density.

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The additional information that is required to obtain the enthalpy of neutralization is the density of the solution.

We know that the enthalpy of neutralization is defined as the heat that is evolved when  an acid is neutralized by a base under standard conditions. We can be able to obtain the enthalpy of the neutralization of the acid and the base by performance of some simple chemical calculations.

To carry out this calculations we need the all of the pieces of information that have been listed in the question such as the masses of the solution, the temperature of the solution in the initial and final states and so on.

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Answer:

1. All red calves i.e. RR

2. All roan calves i.e RW

3. 2 red calves (RR) and two roan calves (RW)

Explanation:

According to this question, a gene coding for fur colour in cattle is involved. Red alleles (R) and white alleles (W) are co-dominant to produce a roan cattle (RW). The possible traits of the following crosses are (see attached punnet square):

1) A red bull (RR) is mated to a red (RR) cow: All red calves i.e. RR

2) A red (RR) bullis mated with white (WW) cow: All roan calves i.e RW

3) A roan bull (RW) is mated with red (RR) cow: 2 red calves (RR) and two roan calves (RW).

One grain of calcium carbonate, or 64.8 milligrams, is dissolved in one US gallon of water to represent one grain per gallon (gpg), a measure of water hardness (3.785412 L).

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The correct expression for calculating the number of grams of aluminum produced is (A) (10 x 15 x 96500)/ (27 x 60),

This can be derived using the Faraday's laws of electrolysis, which states that the amount of substance produced by electrolysis is directly proportional to the quantity of electricity passed through the cell. In this case, the steady current of 10 amperes was passed through the cell for 15 minutes, which is equivalent to 900 seconds (15 minutes x 60 seconds).
To calculate the quantity of electricity passed through the cell, we use the formula I x t, where I is the current in amperes and t is the time in seconds. Therefore, the quantity of electricity passed through the cell is 10 x 900 = 9000 coulombs.
Now, using the equation Q = nF, where Q is the quantity of electricity passed through the cell, n is the number of moles of aluminum produced, and F is the Faraday constant (96,500 coulombs), we can calculate the number of moles of aluminum produced.
n = Q/F = 9000/96500 = 0.093 moles of aluminum
Finally, we can calculate the mass of aluminum produced using the equation m = nM, where M is the molar mass of aluminum (27 g/mol).
m = 0.093 x 27 = 2.511 g of aluminum.
Therefore, the correct expression for calculating the number of grams of aluminum produced is (A) (10 x 15 x 96500)/ (27 x 60), which gives the answer of 2.511 g.

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complete question:

As steady current of 10 amperes in passed though an aluminum-production cell for 15 minutes. Which of the following is the correct expressions for calculating the number of grams of aluminum produced? (1 faraday = 96,500 coulombs)

(A) (10 x 15 x 96500)/ (27 x 60)

(B) (10 x 15 x 27)/ (96500 x 60)

(C) (10 x 15 x 60 x 27)/ (3 x 96500)

(D) (27 x 96500)/ (10 x 15 x 60 x 3)

(E) (27 x 3)/ (96500 x 10 x 15 x 60)

Answer:

D

Explanation:

The two atoms must be of the same element in order for two atoms  to share electrons equally in a chemical bond.

An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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Answer:

The electron cloud - or - electron orbitals

Explanation:

Protons and neutrons are held in the nucleus of the atom; electrons orbit around the nucleus in orbitals. Modern atomic theory tells us that these orbitals are not necessarily a circular or elliptical path but more like a cloud-like area where electrons are likely to be found at any given time.

Answer:

elements in the same period have the same number of shells

the period number the element is in, that is the number of shells it has.

Explanation:

See the table above. Periods at the side, metals at the top, non metals to the right, group to the right of that

NMR signals may consist of a single peak, be split into several peaks, which is known as multiplicity.

The number of peaks of NMR and their relative intensities provide information about the chemical environment of the nuclei being observed. Multiplicity arises from spin-spin coupling between the observed nucleus and one or more neighboring nuclei. This coupling occurs because the magnetic field generated by the neighboring nuclei affects the local magnetic field experienced by the observed nucleus. The pattern of multiplicity can provide valuable information about the number and types of neighboring nuclei and the nature of the chemical bonds between them.

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Answer:

Answer: medium level profession can be defined as some one who has moved past entry level but isn't nearing the end . whereas high level profession means a person has moved past entry level and also has reached the end.

Answer:

medium level profession refers to the profession that can be carried out with the help of extra khowledge,skill and vocational training

higher level profession refers to the top level profession that requires higher education and special indeth tranning

The mass of \(Ag_2CrO_4\) that would be formed will be 2.69 grams.

Mole of 2.5 grams silver nitrate = 2.5/143.32 = 0.017 mol

Mole of 18.0 mL, 0.450 M sodium chromate = 18/1000 x 0.450 = 0.0081

From the balanced equation of the reaction, the mole ratio of silver nitrate to sodium chromate is 2:1. In other words, the sodium chromate is a bit limiting.

The mole ratio of sodium chromate and  \(Ag_2CrO_4\) is 1:1. Hence, the equivalent mole of \(Ag_2CrO_4\) formed would also be 0.0081 mol.

Mass of 0.0081 mol \(Ag_2CrO_4\) = 0.0081 x 331.73

                                                 = 2.69 grams

In other words, the mass of \(Ag_2CrO_4\) formed from the reaction would be 2.68 grams.

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Diatomaceous earth filters c. Can be used for a public water treatment system.

Diatomaceous earth filters are effective in removing particles and impurities from water. While they can be used as part of a public water treatment system, they may be combined with other methods, such as a chlorination system for disinfection or a sand filtration system for further filtration. However, diatomaceous earth filters are not typically used in public sewer treatment systems.

Diatomaceous earth filters are not typically used in public sewer treatment systems as they are designed to remove particles from water, and not sewage. In sewer treatment systems, other types of filtration and treatment methods are typically used, such as activated sludge processes, sedimentation tanks, and anaerobic digestion systems.

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The concentration of [Ag+] present in the solution is 6.53 × 10⁻⁸ M

From the given information, the equation for the reaction between silver ion and ammonia can be represented as:

Ag⁺ + 2NH₃ ↔ [Ag(NH₃)₂]⁺

Given that the solubility constant (Ksp) for the product formed = 1.7 × 10⁷.

The solubility constant for this reaction can be expressed as:

\(\mathbf{Ksp = \dfrac{[Ag(NH_3)_2]^+}{[Ag^+][NH_3]^2} }\)

where;

\(\mathbf{1.7 \times 10^7 = \dfrac{0.025}{(x)(0.15)^2}}\)

\(\mathbf{1.7 \times 10^7 = \dfrac{1.1111}{x}}\)

\(\mathbf{x = 6.54 \times 10^{-8} \ M}\)

Therefore, we can conclude that the concentration of  [Ag+] = x = 6.54 × 10⁻⁸ M.

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The physical properties of elements in the periodic table varies as follows;

The Periodic table is a table which arranges elements based on their increasing atomic number into vertical columns called groups and horizontal rows known as periods.

The physical properties of the periodic table refers to the properties in of the elements in the periodic table which vary in a regular pattern both down the groups and across the periods.

Some physical properties of the periodic table are as given below:

Melting and boiling point: the melting and boiling point of the metallic elements in the period table increases on going from left to to right across the period and decreases on going down the group. For non-metallic elements, the melting and boiling point decreases on going from left to to right across the period and increases on going down the group

Atomic size: the atomic size of the elements decrease across a period from left to right, but increases on going down the group.

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Answer:

876000

Explanation:

You first count three digits from the left, there after you check the next number to the digit to be rounded off. If the number is greater than or equal to 5 then add 1 to the rounding off number, but if it's less than 5, then don't do anything to the rounding off digit but replace the number to right with zeros.

Significant figures are the number of digits that add to the correctness of a value, frequently a measurement. The following number is rounded off to three significant digits as 876000.

The number of significant single digits (0 to 9 inclusive) in the coefficient of expression in the scientific notation is referred to as "significant figures" (SF). The expression's number of significant figures reveals the engineer's or scientist's level of assurance or precision when expressing a quantity.

When a number is rounded off, its value is maintained but is brought closer to the next number, simplifying the number. The crucial figures are preserved when numbers are rounded off.

The following number is rounded off:

876493 = 876000

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True. The element in period 3 that can be used in making computer chips is silicon. because it is a metalloid.

Metalloids have the have properties intermediate of metals and nonmetals. metals give electrons while nonmetals receive. metalloids do neither and rather decides to share. Metals conduct electricity  nonmetals don't while metalloids conduct electricity sparsely. Metals form basic oxides, non metals acidic oxides while metalloids amphoteric or slightly acidic oxides. Metalloids also display typical nonmetal properties like brittleness. Metalloids can also form alloys. The metalloids silicon (Si) is the elements found along the step like line between metals and non-metals of the periodic table and used in making computer chips. It consist of properties from both metals and non-metals.

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Answer:

D

Explanation:

at a point somewhere along the equator

In the case when the Sun appears to be directly overhead at noon should be along with the equator.

It is considered to be the imaginary line that should be arounded with the middle of the planet or the celestial body. It is halfway that lies between the  North Pole and the South Pole, at 0 degrees latitude. In the equator, it divides the planet into a Northern Hemisphere and a Southern Hemisphere

Therefore, based on the above explanation, the option d is correct.

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Answer:

due to the formation of an oxide or hydroxide layer

Explanation:

magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.