isoniazid is used in the treatment of tuberculosis and multiple sclerosis. identify each lone pair as either localized

The given diagram represents the bonding molecular orbital with 2 pi bonds overlapping laterally.

The bonding orbital term is used in the molecular orbital theory or the MO theory which is used to describe the attractive interactions which occur between the atomic orbitals of two or more than two atoms in a molecule.

There are two types of molecular orbitals namely the bonding molecular orbitals and the antibonding molecular orbitals. Bonding molecular orbitals are types of molecular orbitals which are involved in the formation of the chemical bonds whereas the antibonding molecular orbitals are the orbitals which contain the electrons that are present outside the region which is there between two atomic nuclei.

In the given diagram, there is a lateral overlap of two pi bonding molecular orbitals.

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Answer: 179 grams

Explanation:

In a chemical reaction, the law of conservation of mass applies, meaning that the total mass of the reactants is equal to the total mass of the products. In this case, the reactants are 162 grams of copper and 17 grams of oxygen, and the product is copper (II) oxide. Using the balanced chemical equation 2Cu + O2 -> CuO, we know that 1 copper atom reacts with 1 oxygen molecule to form 1 copper oxide. Therefore, the mass of copper oxide produced is equal to mass of copper plus mass of oxygen, which is 162g + 17g = 179g.

The mass of a gas molecule (or atom) can be computed from the specific heat at constant volume . The mass of the gas is 6.6 × 10⁻²³ kg. The molar mass of the is 39.74 g/mol

The specific heat at constant volume, cv =  0.075 cal/g °C.

Cv = ( 3/2) R = ( 3/2) ( 1.98) = 2.98 cal /mol K

The molar mass, M = m / n = Cv / cv

                                = 2.9805/0.075

                                =39.74 g/mol

The mass = molar mass / Na

The mass = 38.74 / 6.023 × 10²³

The mass = 6.6 × 10⁻²³ kg

This question is incomplete, the complete question is :

The mass of a gas molecule (or atom) can be computed from the specific heat at constant volume cv. given that the specific heat of argon is cv is 0.075 cal/g °C for a gas and calculate (a) the mass of its atom and (b) the molar mass.

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In the following biochemical reaction, the dissolved oxygen in mg/l is needed for the solution containing 1 mg/l of CH₂O is 1 mg /L.

The reaction is given as :

CH₂O   +   O₂  ---->  CO₂   +   H₂O

The molar mass of CH₂O = 30 g/mol

The molar mass of O₂  = 32 g /mol

1 mole of O₂  react with 1 mole of  CH₂O

30 g CH₂O react with 32 O₂

so, 1 mg / L of CH₂O require = (32 / 30 ) × 1 mg/L

 1 mg / L of CH₂O require = 1.0 mg/L of oxygen.                                              

Thus, the oxygen needed is 1.0 mg/L .

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The chemical characteristics of transported substances impact the type of diffusion that will be used by the cell.

What are the the chemical characteristics of transported substances ?

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Answer:

Explanation:

Na & I -> NaI (Sodium iodide)Be & Br -> BeBr2 (beryllium bromide)Ca & S -> CaS (Calcium sulfide)Ca & N -> Ca3N2 (Calcium Nitride)Al & P -> AlP (Aluminum phosphide)Al & Te -> AlTe (Aluminum telluride)K & O -> KO (Potassium oxide)Na & S -> Na2S (Sodium sulfide)Sr & Cl -> SrCl2 (Strontium chloride)Sr & S -> SrS (Strontium sulfide)Al & F -> AlF3 (Aluminum fluoride)Mg & S -> MgS (Magnesium sulfide)Rb & Se -> RbSe (Rubidium selenide)Al & O -> Al2O3 (Aluminum oxide)Ba & P -> Ba3P2 (Barium phosphide)It is important to note that these compounds are formed by ionic bonding where the metal atom loses electrons to form a positive ion ( cation) and the non-metal atom gains electrons to form a negative ion (anion). The cation and anion combine to form a neutral compound.Also, the nomenclature of these compounds follow the IUPAC rules, which have a set of conventions to name compounds based on the elements present and their oxidation states, and the number of atoms of each element in the compound.

On adding 50 g sample of iron at 100°C is added to 500 mL of water at 35°C in a perfectly insulated container, then the heat energy which is lost by iron will be equal to the heat energy which is gained by water.

When a particular system is isolated inside an insulated container, then the heat energy is transferred from the sample to the water and also to the container. According to the law of conservation of energy, the heat energy which is lost by the added sample is equal to the heat energy which is gained by the water as well as the container.

When 50g of iron sample at 100°C is added to 500mL water at 35°C in an insulated container, then the heat energy which is lost by the iron sample will be equal to the heat energy gained by the water.

Hence, the correct option is D. The heat energy which is lost by iron will be equal to the heat energy that is gained by water.

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The value of n of the formula, Na₂SO₄•nH₂O is 10

To obtain the value of n in the formula, we shall determine the formula of the hydrate. Details below:

Divide by their molar mass

Na₂SO₄ = 1.42 / 142 = 0.01

H₂O = 1.8 / 18 = 0.1

Divide by the smallest

Na₂SO₄ = 0.01 / 0.01 = 1

H₂O = 0.1 / 0.01 = 10

Thus, the formula of the hydrate is Na₂SO₄•10H₂O

Comparing the formula of the hydrate, Na₂SO₄•10H₂O with this Na₂SO₄•nH₂O, we can see that the value of n is 10

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Buffering capacity measures a solution's capability to withstand pH fluctuations by either absorbing as well as desorbing H+ as well as OH- ions.

Aqueous buffer solutions were made up of a weak acid as well as its conjugate base or even a weak base as well as its conjugate acid. The capability of buffer solutions to keep a fairly constant pH value in reaction to the addition of a tiny amount of acid or base is an important attribute.

A buffer would be a solution that avoids pH changes when a minuscule portion of strong acid as well as strong base is added. Technical definition (How does one come up with one?): A buffer was made up of a weak acid and its conjugate base.

Thus, the correct answer will be option (b).

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The following which would not be an application of Stuart Wilkinson's theory as regards marrying the idea of useful robotic capabilities in terms of eating food is a recycling truck that feeds on petroleum and is denoted as option D.

This is referred to as a machine which is able to replicate certain human movements and functions automatically through the use of an external control device.

Since Stuart Wilkinson's theory intends to marry the idea of useful robotic capabilities in terms of eating food then a recycling truck that feeds on petroleum isn't accurate because petroleum isn't a source of food.

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You are not permitted to eat in the lab, but you may consume beverages. Eating and drinking are permitted in the laboratory as long as there are no open cultures on the bench top.

A laboratory is a controlled environment in which scientific or technological research, experiments, and measurements can be carried out. Laboratory services are available in a variety of settings, including doctors' offices, clinics, hospitals, and regional and national referral centres.

The various requirements of the specialists working within laboratories determine the organisation and content of laboratories. A physics laboratory might have a particle accelerator or a vacuum chamber, whereas a metallurgy laboratory might have equipment for casting, refining, or testing metal strength. A wet laboratory may be used by a chemist or biologist, whereas a psychologist's laboratory may be a room with one-way mirrors and hidden cameras to observe behaviour.

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The delta H (in KJ/mole NaOH) for the solution (9.55g sample of solid NaOH (sodium hydroxide) dissolves in 100g of calorimeter in coffee-cup calorimeter, the temperature rises from 23.6 to 47.4 Celsius.)  process = 31,204 kJ/mol

The specific heat capacity of a material is defined as the amount of heat (J) absorbed per unit mass (kg) when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Specific heat of water = 4.18 J/g °C

The total mass = 100 + 9.55 = 109.55 g

To determine the heat, use equation:

Q = mCΔT

Where:

Q = heat energy (Joule)

m = mass (kg)

C = specific heat (J/g°C)

ΔT = change in temp (°C)

Q = (109.55) x (4.18) x (47.4 - 23.6)

= 10,898 Joule

Moles of NaOH: mass / molar mass

= 9.55 / (23 + 16 + 1)

= 0.23

Enthalpy of reaction:

7177 / 0.23 = 31,204 kJ/mol NaOH

So, delta H (in KJ/mole NaOH) for the solution process = 31,204 kJ/mol

The question is incomplete, it should be:

When 9.55g sample of solid NaOH (sodium hydroxide) dissolves in 100g of calorimeter in coffee-cup calorimeter, the temperature rises from 23.6 to 47.4 Celsius. Calculate Delta H (in KJ/mole NaOH) for the solution process.  Assume that the specific heat of the solution is the same as that of pure water.

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Answer: a. C2H2 C 2 H 2 and C6H6 C 6 H 6

Explanation:

The pair with the same ratio will have the same empirical formula. a. C2H2 C 2 H 2 has a 1:1 ratio, and C6H6 C 6 H 6 also has a 1:1 ratio. Therefore, this pair shares the same empirical formula.

Epsomite or Epsom salt is one of the minerals in which magnesium sulfate is found in its hydrated form.

Magnesium sulfate heptahydrate, often known as epsomite, is a mineral having the chemical formula MgSO47H2O.

Epsomite often takes the form of vast encrustations, however, the orthorhombic system can occasionally produce acicular or fibrous crystals. It ranges from colourless to white with pink, green, and yellow undertones. The specific gravity is only 1.67 and the Mohs hardness ranges from 2 to 2.5.

It dissolves easily in water. After absorbing water from the air, it changes to hexahydrate, losing one water molecule along the way and adopting a monoclinic shape.

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Nucleic acids (DNA and RNA) are polymers of nucleotides, the structural backbone of nucleic acids contains "Phosphate - Sugar - Phosphate - Sugar'' repeating pattern.

In both RNA and DNA, every nucleotide has the same basic structure. This structure consists of a phosphate group that is bonded to a pentose sugar via a phosphodiester bond and that is then connected to an organic base.

Ribose is found in RNA, and deoxyribose is found in DNA. Both of these sugars are pentoses. In DNA, the organic bases are A, G, C, and T; in RNA, they are A, G, C, and U. (adenine stands for adenine, guanine for guanine, cytosine for cytosine, thymine for thymine, and uracil for uracil). The structural backbone of nucleic acids contains "Phosphate - Sugar - Phosphate - Sugar'' repeating pattern.

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Difference In electronegativity =3.0-2.1 = 0.9

Difference in electronegativity = 4.0 - 1.0 = 3.0

Difference in electronegativity = 2.5-2.1 = 0.4

Difference in electronegativity = 2.1-1.5 = 0.6

Not all atoms attract electrons with the same force. The amount of "pull" an atom exerts on electrons is called electronegativity. Atoms with high electronegativity – such as fluorine, oxygen and nitrogen − exert a greater attraction for electrons than atoms with low electronegativity.

In a bond, this causes an unequal sharing of electrons between atoms, as the electrons will be attracted towards the atom with the higher electronegativity.

Since electrons have a negative charge, the unequal sharing of electrons in bonds leads to the formation of an electric dipole: the separation of positive and negative electric charges. Because the number of charges separated in the dipole is usually less than the elementary charges, they are called partial charges, denoted as δ+ (delta plus) and δ− (delta minus).

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The wind is going to move to the west due to convection.

We have to know something about the convection current of a fluid. Let us note that when convection is taking place, there would be the movement of the warm fluid upwards while the cool fluid would move downwards.

We are told that a warm air mass is located in the southwest United States and a cold air mass is located in the southeast United States.

This is why there would be the movement of the warm air mass towards the west and this is due to the convection of the air mass as discussed here.

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The chemical equation for the given reaction is Cl₂+2KBr→2KCl+Br₂.

When chemical bonds between atoms are made or broken, chemical processes take place. Reactants are the substances that start a chemical reaction; products are the substances that come out of the process. To show the direction of a chemical equation, an arrow is drawn between the reactants and products. However, as we'll see in more detail in the section after this, a chemical equation is not always a "one-way street." Since no atoms are formed or destroyed during a typical chemical equation, equations must be balanced to reflect this principle. This principle is known as the law of conservation of matter.

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The name "Magnesium Dichloride" is incorrect for the compound MgCl2 because the compound is not composed of magnesium and chlorine only in a 1:1 ratio. The compound is actually composed of one Magnesium atom (Mg) and two Chlorine atoms (Cl2).

The correct name for the compound MgCl2 is Magnesium Chloride, which describes the chemical formula accurately. The prefix "di-" refers to two atoms and is used when there are two atoms of the same element in a compound, In this case, there are two chlorine atoms in MgCl2.

Answer:

I'm not sure but I think it is B. Over 50% of the water in watersheds may pose a health risk. I'm not sure but I think it is B

2 moles of oxygen have been necessary to start producing 1.6 moles of nitrogen monoxide.

Nitrogen, sometimes known as N, is an element that has no taste or color. Nitrogen can be found in the air we breathe, the liquids we drink, and the floor beneath our feet. In fact, nitrogen has been the most common element in the stratosphere, accounting up 78% of it.

The atomic number of the alkali metal nitrogen is seven, and its nucleus has seven protons. Single - molecule nitrogen is a chemical compound made up of two tightly bound nitrogen atoms (N2). Isolated nitrogen is a clear, odorless, unpalatable, and inert gas at ordinary temperatures and pressure.

The mole ratio,

O₂ : NO = 5:4

= 5 / 4 * 1.6

= 8 / 4

= 2 mol

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Option A, Black body radiation is related to photons.

A black body, is described as an ideal object that emits all frequencies of radiation. The spectra generated by this depends only on the temperature and not on the black body's composition. This happens because the black body wants to stay in thermal equilibrium. Black body radiations are explained with the help of following laws : Wien’s displacement law, Planck’s law and Stefan-Boltzmann law. Amongst these, the Planck's law states that energy emission (radiation) is not a continuous process, it takes place in discrete units or quanta of energy, the size of which involves a fundamental physical constant (Planck’s constant). These packets, called photons carry energy = hc/λ , where h = planck's constant, c = speed of light and λ = wavelength of radiation.

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The heat will remain constant.

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"We Are The Sun". Child looking at the moon. Just looks like the sun. These are the days. Some things don't change.

Summer, followed the sun till night reminiscing other times of life?

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II. Elements in group 7 show a gradual change in physical properties.

III. The position of an element in period 3 is related to the number of electrons in the highest Occupied energy level.

The periodic table is a table that displays each chemical element in each system. These chemical elements have a very large number, with different properties, from one element to another.

The purpose of making the periodic table of elements is to recognize the element names of chemical particles easily through grouping.

The periodic system is also defined as an arrangement that displays various chemical elements based on their atomic number and similar chemical properties.

In grouping the periodic table, the physical and chemical properties of each of these elements have been outlined by chemists in the form of a table of elements.

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The rules for deciding which digits in a measurement are significant are as follows: Rule 1: All nonzero digits in a measurement are significant.

What are measured quantities?

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For granulocyte concentrations, all of the following lab tests must be performed on the unit by the donor center except lymphocyte enumeration.

Granulocytes are immune cells with granules (small particles) containing enzymes that are released during infections, allergic reactions, and asthma attacks. Granulocytes include neutrophils, eosinophils, and basophils. Granulocytes are specialized white blood cells. On the other hand, lymphocytes are a type of white blood cells (leukocytes) which are agranulocytes - meaning, that they lack presence of granules in their cytoplasm - they are not granulocytes. Lymphocytes constitute of B and T cells. Lymphocyte enumeration is an assay designed for enumerating the percent and absolute cell counts of lymphocyte subsets in lysed whole blood. Antibodies which are specific for certain cell surface antigens present on the lymphocytes, are labeled with fluorochromes. When whole blood sample and these labelled antibodies are added together, these antibodies bind to the targeted antigens on the lymphocytes. Following incubation, lysing and fixation, absolute count and percentage count are enumerated utilizing an internal quantitation standard.

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Answer:

The strength of the magnetic field is inversely proportional to the distance from the current carrying conductor. That is, as the distance increases the magnetic field decreases.

There are two vertical nodal planes in each of the molecular orbitals for benzene.

The molecular orbitals of benzene are composed of overlapping p orbitals of the carbon atoms. These molecular orbitals include:

Each of these molecular orbitals contains two vertical nodal planes, which are planes of zero electron probability that divide the orbital into two lobes. The vertical nodal planes occur perpendicular to the plane of the hexagonal ring of benzene, and they separate the two lobes of the orbital. The two lobes are of equal size, and they are located on opposite sides of the nodal plane. As a result, the two vertical nodal planes form a cross-sectional cut of the molecular orbital.

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