how should you react to questions you are unable to answer in the question-and-answer session of a presentation? group of answer choices simply tell them you don't know. close the question-and-answer session.

Amount of heat energy that is required to heat 906 g of ice to steam is 530952 Joules.

Explanation:

Given:

Amount of transferred energy = Q =?

Mass of ice (water) = m = 906 g

Initial temperature of ice = T(i) = -22° C

Final temperature of steam = T(f) = 118°C

Formula for Heat capacity is given by

Q = m×c×Δt ........................................(1)

where:

Q = Heat capacity of the substance (in J)

m=mass of the substance being heated in grams(g)

c = the specific heat of the substance in J/(g.°C)

Δt = Change in temperature (in °C)

Δt = (Final temperature - Initial temperature) = T(f) - T(i)

                                                                          = 118 - (-22) = 140°C

Specific heat of water is c = 4.186 J /g. °C

Substituting these in equation (1), we get

Q = m×c×Δt

   = 906 × 4.186 × 140

   = 530952.24 J

The heat energy required is equal to 530952.24 Joules ≅ 530952 Joules.

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In the gas phase, orbital mixing or sigma pi crossover occurs at high temperatures. Between carbon and oxygen molecules, there are differences in the molecular orbital arrangement.

What do you think of orbital theory?

Every atom has a propensity to cluster together to form molecular orbitals, claims the molecular orbital theory. Because of this arrangement, electrons are commonly connected to various nuclei and can be found in a wide range of atomic orbitals.

How is the theory of molecular orbitals created?

The atomic orbitals of the molecules' atoms are combined to form the molecules' molecular orbitals. Take the H2 molecule as an illustration. The mathematical functions for the two 1s atomic orbitals that combine to produce one of the molecule's molecular orbitals are added together.

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Lewis structure for nbr3 is:

5+7(3) = 26

structure:

:[tex]\ddot{Br}[/tex]:[tex]\ddot{N}[/tex]:[tex]\ddot{Br}[/tex]:

    :[tex]\ddot{Br}[/tex]:

What is Lewis structure?

A Lewis structure is a very condensed representation of the electrons in the valence shell of a molecule. It provides a picture of the location of the electrons around the atoms of a particular molecule. The electrons are shown as "dots" or as a line when two atoms are bound together.

An oxygen atom, for example, has six electrons in its outer shell.

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581.247 g of fluorine, F₂, are needed to generate 7.65 moles of carbon tetrafluoride, CF₄.

A mole is a very crucial unit of measurement used by chemists. A mole of a thing means you have 602,214,076,000,000,000,000,000 eggs. Just 12 eggs means she has 12 eggs. Chemists need to measure very small things such as atoms, molecules and other particles in moles. The number of moles, Avogadro's number, relates to the relative sizes of atomic mass units and gram mass units. A hydrogen atom has a mass of about 1 u, while a mole of H atoms has a mass of about 1 gram.

C + 2F₂ → CF₄

Mole ratio of F₂ and CF₄ is 2:1 i.e, the moles of fluorine are twice as much as the moles of carbon tetrafluoride.

Moles of carbon tetrafluoride = 7.65 moles

Moles of fluorine = 2 × 7.65

= 15.3 moles.

For mass of fluorine:

m = n × Mm

Where, m = mass of fluorine

n = moles of fluorine (15.3 moles)

Mm = molar mass of fluorine (37.99 g/mol)

m = 15.3 × 37.99

m = 581.247 g

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The ethanol solution (400 ml) was diluted to 4.00 l, which gives a concentration of 0.0400 M. The concentration of the original solution is 0.400 M.

To solve this question, first we need to convert the given volume of a diluted solution in ml

4.00 L×(1000 mL/1 L)=4000 mL

According to the dilution law, degree of dissociation of a weak electrolyte is inversely proportional to the square root of molar concentration. The dilution law in the form of formula is

M₁V₁=M₂V₂

Where, M₁=?

V₁=400 mL

V₂=4000 mL

M₂=0.0400 M

Rearrange the formula for M₁ and solve

M₁=(M₂×V₂/V₁)

M₁=(0.0400 M×4000 mL/400 mL)

M₁=(160 M/400)

M₁=0.400 M

Therefore, the concentration of the original solution is 0.400 M.

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The balanced reaction equation is:

C2H2(g)+2H2(g)→C2H6(g)

The given volume of ethane product is:

vC2H6) = 7.5 L

We assume that this ethane was formed at constant temperature and pressure conditions. Therefore, we can relate volume values through the given stoichiometry. Assuming complete reaction, the ethane volume was formed from the given volume of hydrogen reactant:

v(H2) = 15 L

Acetylene and hydrogen react in a 1:2 ratio, so the required volume of acetylene is:

v(C2H2) = 7.5 L

Gas-Phase Chemical Reaction:

The volume of a gaseous species is highly sensitive to its temperature and pressure conditions. If these conditions are held constant, then the gas volume will vary proportionally to its molar quantity. If a given reaction system occurs in the gas phase at constant temperature and pressure conditions, then the behavior described here will apply to every gaseous species present. Therefore, the volume of each reactant will decrease over time, while the volume of each product will increase over time. The set of volume values will be related through the balanced stoichiometry.

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The initial volume of the solution of Pb(NO3)2 is 37.29 milliliters required to dilute for mentioned condition.

The volume will be calculated by the formula -

[tex] M_{1}[/tex][tex] V_{1}[/tex] = [tex] M_{2}[/tex][tex] V_{2}[/tex], where we have initial concentration and volume on Left Hand Side and final concentration and volume on Right Hand Side. Now, keeping the values in formula to find the final volume in milliliters.

0.49 × [tex] V_{1}[/tex] = 0.21 × 87

Performing multiplication on Right Hand Side of the equation

0.49 × [tex] V_{1}[/tex] = 18.27

Shifting the numerical value from Left Hand Side to Right Hand Side of the equation

[tex] V_{1}[/tex] = 18.27 ÷ 0.49

Performing division on Right Hand Side of the equation

[tex] V_{1}[/tex] = 37.29 millilitres

Hence, the volume is 37.29 milliliters.

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The kinetics of first order governs nuclear decay. The nuclide's rate constant is 0.0803 min1, and it decays from 12.9 g to 2.04 g in 23.0 minutes.

This number of protons, neutron, and the activity state of a nucleus define a species of atom known as a nuclide, also known as a nuclear species. Thus, a nuclide is identified by its atomic number and mass number (A) (Z).

A kind of atom known as a nuclide is one that has a particular number of proton and neutrons with in nucleus, such as carbon-13, which has 6 protons & 7 neutrons. Radionuclides connected to the carrier release ionizing radiation that kills cancer cells.

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If we added concentrated nitric acid (hno3) instead of hydrochloric acid to each test tube in step 7 Both NaCl(s) and NaC,H,O,(s) would precipitate out of solution.

Salt is another name for sodium chloride. It occurs in sea and inland waters. Additionally, rock salt is obtainable. Seawater contains 1% to 5% sodium chloride. It is a crystalline, white substance. When it is in an aqueous state, it is referred to as a saline solution. This substance is water soluble and contains sodium cation and chloride anion. Sodium and chloride ions are present in a 1:1 ratio. It is commonly known as table salt and is primarily used in the food industry for flavouring and preservation. The pH of sodium chloride is 7.

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Answer:

D. 25 amu

Explanation:

Answer:

D

Expla

14 NHÂN 1 + 11 NHÂN 1 = 25 AMU

The chemical that is forms a white precipitate when you test for sulphate ions in solution is called barium sulfate.

Barium sulfate is described as the inorganic compound with the chemical formula BaSO₄ that is a white crystalline solid that is odorless and insoluble in water. It occurs as the mineral barite, which is the main commercial source of barium and materials prepared from it.

During qualitative analysis of anions, sulphates react with barium chloride to form white precipitate of barium sulphate.

Barium Sulphate is known to be composed of a barium cation and the sulphate anion. The sulphur is seen to be attached to four oxygen atoms. BaSO4 is a sulphate salt of barium and is found as the mineral barite which is a crystalline solid white which is insoluble in water and alcohol but soluble in concentrated acids.

Barium Sulphate is odourless.

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As more co2 is absorbed into the oceans the PH of the oceans dropped, making the water there more acidic.

Why does seawater include substances?

Seawater contains a wide variety of distinctive compounds. Numerous of these chemicals can be seen as a result of freshwater in water evaporating and leaving behind salt. Water, or H2O, is a pure substance made up only of water and oxygen.

What class of chemical solution is seawater?

Seawater is a mixture of dissolved chemicals and rainwater. Water is a fantastic solvent. Solvents are juices that dissolve other substances. The bulk of the water on earth, including the liquid in oceans, lakes, rivers, and ponds, contains a variety of solutes.

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The heat was required for his temperature change  26752 J.

given that :

volume : 100 mL

The initial temperature = 23 °C

The final temperature = 87 °C

ΔT = 87  °C - 23  °C = 64 °C

density = mass / volume

mass = density × volume

         = 1 × 100

         = 100 g

the specific heat expression is given as :

Q = m c ΔT

where,

specific heat capacity , c = 4.18 J/g °C

mass of water , m = 100 g

change in temperature , ΔT = 64 °C

Q = 100 × 4.18 × 64

Q = 26752 J

Thus, the initial temperature of 100.0 ml of water was 23 °C . the water was then heated to 87 °C .heat (in j) was required for this temperature change is 26752 J.

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Reactants for a neutralization reaction are shown in the equation. When these reactants produce products, H+ will be released and will bind with OH- to form water.

In a neutralization reaction, which takes place when an acid and a base react to produce water and a salt, the interaction of H+ ions and OH- ions results in the production of water. The neutralization of a strong acid and strong base yields a pH of 7. Neutralization or neutralisation is the quantitative chemical reaction between an acid and a base. Hydroxide or surplus hydrogen ions are eliminated from the solution by neutralizing the reaction in water.

Strong acid and strong base reactions produce a salt that is neither acidic nor basic in nature, or neutral. For instance, sodium chloride and water are produced when HCl (hydrochloric acid), a powerful acid, combines with NaOH, a powerful base.

Taking a base balances out our stomach's excess acid. Due to the formic acid in the ant sting, it can be painful. Using moist baking soda, which is basic in nature, we can counteract this acid effect and lessen the pain brought on by the sting.

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Mass of h2s can be vaporized (at its boiling point) with 100 kj of energy is 181g.

Energy = 100 kj

heat of vaporization of h2s =   18.8 kj/mol

Mass of h2s can be vaporized = Energy x molar mass/ heat of vaporization .

100 x 1 x 34.1g/18.8  = 181g

An object's or a substance's mass is a measurement of how much matter there is in it. Although grams can be used to measure smaller masses instead of kilograms, which is the standard SI unit for mass Using a balance would be necessary to determine mass. The quantity of matter in a specific object is measured by its mass. It will have the same mass regardless of where that object is in the vast universe. A measurement of the gravitational force acting on an object is its weight, on the other hand. Mass/weight units. The metric system uses the mass units gram (g), kilogram (kg), and tonne (t). 1000 g = 1 kg. A ton is 1000 kilograms.

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NO3 is a form of nitrogen that can be utilized by plants.

What is an NO3?

The chemical formula for the polyatomic ion nitrate is NO3. The word "nitrates" refers to salts that include this ion. Many fertilizers and explosives have nitrates as a component. Water can dissolve almost all inorganic nitrates.

What is an nitrogen?

In Group 15 [Va] of the periodic table, nitrogen (N) is a nonmetallic element. The most prevalent element in the atmosphere of Earth is this colorless, flavorless, and odorless gas, which is also a component of all living things  nitrogen.

Therefore, NO3 is correct answer.

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The above reaction is a spontaneous reaction as E0cell>0 and the reaction proceeds spontaneously.

What is electromotive potential?

The terminal potential difference, also known as EMF or electromotive force, occurs when no current flows.

The half reactions of the equation being

Zn (s) → Zn2+ (aq) + 2e- oxidation half-reaction  (Zn2+ (aq) + 2 e- → Zn (s) -0.76)

Cu2+ (aq) + 2e- → Cu (s) reduction half reaction (Cu2+ (aq) + 2 e- → Cu (s) +0.34)

E°oxid=- E°red= +0.76V

The chemical reaction occurs spontaneously, and an electron participates in it.

Therefore the above reaction is a spontaneous reaction as E0cell>0 and the reaction proceeds spontaneously.

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It will take 24 days long for the radiation level of barium-131 to drop to 1/4 of its original level.

What is radiation level?

To achieve a more stable state, an unstable atom will sometimes release energy on its own, causing radioactivity. Ionizing Energy released by a radioactive atom is known as radiation. Different radioactive atoms of the same element with varying amounts of neutrons are known as radioactive isotopes.

These forces eliminate extra atomic energy in order to achieve a strong, stable balance (radioactivity). Radiation is the term for the spontaneous emission of energy that may occur as a result of unstable nuclei during that process.

Therefore, It will take 24 days long for the radiation level of barium-131 to drop to 1/4 of its original level.

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SF6  gas is most likely to depart from the assumption of the kinetic-molecular theory that says there are no attractive or repulsive forces between molecules.

The synthetic fluorinated compound sulfur hexafluoride (SF6 gas) has a very stable molecular structure. Electricity utilities heavily rely on SF6 in electric power systems for voltage insulation, current interruption, and arc quenching during the transmission and distribution of electricity due to its special dielectric properties. The strongest greenhouse gas currently known, however, is this one. SF6 traps infrared radiation 22,800 times better over a 100-year period than an equivalent amount of carbon dioxide. With a 3,200-year atmospheric lifetime, SF6 is also a very stable chemical. As the gas is released, it builds up in the atmosphere where it remains essentially undamaged for centuries. Therefore, a relatively small amount of SF6 can have a big impact on the world.

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An assumption based on some evidence is known as a hypothesis. This is the starting step of any investigation that converts the research questions into hypotheses, such as protons and electron carriers.

Additionally, transport molecules and proteins as well as inorganic electron acceptor and donor are used in hypothesis. Variables, the population, and how the variables relate to one another are all included. The association between two or more variables is tested using a research hypothesis. An atom's stable negatively charged element is called an electron. The atom's nucleus is surrounded by and has electrons outside of it. When compared to a neutron or proton, an electron's mass is very little and it contains one unit of negative charge (1.602 x 10 -19 coulomb).

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Answer:

10.081g÷12.5cm³ = 0.806g/cm³

Answer:

Because coal takes millions of years to develop, it is classified as a nonrenewable energy source. Coal contains the energy accumulated by plants that thrived in marshy forests hundreds of millions of years ago. Biofuel, on the other hand, is derived from biomass, such as plant or algal material or animal waste.

Explanation:

N-acetyl-β-glucosamine is reducing sugar whereas D-gluconate and GlcN(α1-1α-)Glc are non reducing sugar.

Because it has a free anomeric carbon at position C-1 that can open to the straight-chain form and be oxidized, N-acetyl-β-glucosamine is a reducing sugar. D-gluconate is not a reducing sugar because its anomeric carbon at C-1 is already oxidized to the level of a carboxylic acid. Because it lacks a free anomeric carbon, the disaccharide GlcN(α1-1α-)Glc is not a reducing sugar. This compound's two glucose units' anomeric carbons are linked together by an O-glycosidic bond, preventing them from opening to the straight-chain forms needed for oxidation.

Hence, reducing behavior is decided on basis of free OH group on anomeric carbon.

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The hydrogen atoms in menthyl chloride are all facing the same direction, which places the chloride atom in a different location. Because of this, it is eliminated more slowly than neomenthyl chloride.

Low levels of chlorine in your body lead to hypochloremia. It can be brought on by fluid loss from vomiting or nausea as well as by pre-existing disorders, illnesses, or drugs. To confirm hypochloremia, your doctor could do a blood test. Restoring your body's chloride levels helps alleviate hypochloremia in minor cases.

Table salt and sea salt both include chloride in the form of sodium chloride. Additionally, many veggies contain it. Foods having greater chloride content include rye, tomatoes, seaweed, and.

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Error  we trying to reduce by using chilled water in a calorimeter before adding a hot metal is specific heat calculation.

These circumstances are ideal since they make temperature variations more obvious.

In this experiment, ice was introduced to the calorimeter to cool the water below room temperature before the hot metal was added. We can lower systemematic error in this method. The specific heat calculation would be off if we used water that was room temperature.

Unwanted heat loss to the environment is typically the main source of mistake in calorimetry. By adding a lid and insulating the calorimeter's sides, this can be decreased.

Following are three potential sources of mistake in a calorimetry: measurement of temperature, mass calculation, unwanted heat leakage to the environment.

Thus, using chilled water in a calorimeter before adding a hot metal will reduce systematic errors.

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The equation that can be used to find the pressure of the gas when the volume is changed is P(v) = 500/v.

An inverted container filled with water can be used to collect the gas produced during a chemical reaction and estimate its volume. Water is forced out of the container by the gas, and the amount of liquid expended serves as a gauge for the gas's volume.

Boyle's law, which states that the volume of a given quantity of gas held at constant temperature is inversely proportional to the pressure under which it is measured, encapsulates this principle.

p(v) = pressure of a gas

v = volume of the gas

P(v) varies inversely with v

let k = constant of proportionality

P(v) = k/v

If P(v) = 25 kg/cm² and v = 200cm²

Therefore,

P(v) = k/v

25 = k / 200

25 × 200 = k

k = 5,000

substitute the value of k into the equation

So, P(v) = 500/v

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All possible downward transitions for an electron in the 3d state are 1s 2s 2p 3s and 3p.

The transition state of a chemical reaction is a particular configuration along the reaction coordinate. It is defined as the state corresponding to the highest potential energy along the  reaction coordinate. It is often marked with the double dagger.

The transition state is a high-energy state, and some amount of energy the activation energy  must be added in order for the molecule reach it. Because the transition state is unstable, reactant molecules don't stay there long, but quickly proceed to the next step of the chemical reaction.

In an atom, electrons can transition up or down depending on whether they absorb energy or emit energy. Electrons naturally want to be in the lowest possible energy state. Downward transitions would be possible to any lower energy level than the one the electron starts in so all possible downward transitions for an electron in the 3d state are 1s 2s 2p 3s and 3p.

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To create the salt bridge from the cu chamber, potassium chloride or potassium nitrate that have gelled in the agar-agar media are dissolved in agar.

What is the salt bridge?

a type of electrochemical cell that joins the oxidation and reduction half cells with the aid of a salt bridge and a weak electrolyte. A salt bridge is a connector that connects an electrolytic solution's anodic and cathodic compartments.

What sort of salt bridge is this?

Salt bridges can be made using KCl, AgNO3, and other substances. Salt bridges are often utilized in a galvanic cell, such as a voltaic cell or Daniel cell. If there is no salt bridge, the solution in the half cell will accumulate the negative charge.

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During the transamination process, the enzyme transaminases use Pyridoxal pyrophosphate as a cofactor.

All transamination reactions, as well as several amino acid oxylation and deamination processes, involve the coenzyme pyridoxal phosphate. The aminotransferase enzyme's epsilon-amino group of a particular lysine group forms a Schiff-base bond with the aldehyde group of pyridoxal phosphate.

The epsilon-amino group of the lysine residue in the active site is replaced by the alpha-amino group of the amino acid substrate. The ensuing intermediate, a quinoid, undergoes deprotonation to become an aldimine, which is then protonated to become a ketimine by accepting a proton in a different position. Ketamine undergoes hydrolysis, leaving the amino group on the protein complex intact.

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In which species can we describe the central atom as having sp³d hybridization is SF₄.

The hybridization of SF₄ :

number of electron pair = 1 / 2 [ V + N + C - A ]

where, V = number of valence electron = 6

N = number of molecule = 4

C = cation = 0

A = anion = 0

number of electrons pair = 1 /2 [ 6 + 4 ]

                                       = 5

The , number of electron pair is 5 out which 4 are bonding electrons and one is non bonding electron pair , present as lone pair. the hybridization is sp³d.

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