0 the following electron configurations represent excited states. identify the element and write its ground-state condensed electron configuration.

Average rate =   - d reactant/d time + d product/d time

negative sign indicates that decrease in concentration of reactant and positive sign shows the increment in concentration of product

d represents the change in concentration,  t represents time

Considering the reaction

2H3PO4→P2O5+3H2O

rate =  d ( p^2o^5)/ d t

     =  (p^2o^5) 40 sec -  (p^2o^5) 10 sec / 30  

  =  7.0 * 10^-3- 1.10 * 10^-3/30

  rate = 2 * 10^-4m/s

2H3PO4→P2O5+3H2O

rate = - d H3PO4/2t  = d ( p^2o^5)/ d t

d H3PO4/t = 2 *  d ( p^2o^5)/ d t

          = 2 * 2 * 10^-4

         = 4 * 10^4 m/s

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Answer: b=3-2c-a

Explanation:

a+b+2c=3

a-a+b+2c=3-a

b+2c=3-a

b+2c-2c=3-2c-a

b=3-2c-a

The ph of a dilute solution that contains a molar ratio of potassium acetate to acetic acid  is 5,46.

pH pKa log

pH 4.76 log ([acetate]/[acetic acid]), where [acetate]/[acetic acid] is the ratio given for each part of the question.

pH = pka + log [acetate/acetic acid]

pH = 4.76 + log ( 5/1)

pH = 5.46

Ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid are other names for acetic acid, which has the chemical formula CH3COOH.

As a byproduct of fermentation, acetic acid gives vinegar its distinctive smell. About 4-6% of the acetic acid in vinegar is water.

Acetic acid, officially known as ethanoic acid, is an organic molecule with the chemical formula CH3COOH that is acidic and colorless. Apart from water and other trace ingredients, vinegar has at least 4% acetic acid by volume, making acetic acid its primary ingredient.

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The balanced equation is a combustion reaction . The reaction is as follows:

2C₈H₁₈(g) + 25O₂(g) →16CO₂(g)+18H₂O(g)

Equating :

The number of moles in 20 grams of octane can be calculated as follows:

No. Of moles=mass/relative molecular mass.

=20/(12*8+1*8)

=20/104

=0.2moles

The reaction ratio is 2:25

Hence if 2 moles octane react with 25 moles of oxygen

According to the law of conservation of mass, the mass of the products must be same because the mass of the reactants in every chemical equation. Thus the amount of atoms of every element must be same on both sides of the equation.

2 moles of octane weigh = 2×114g/mol

                                         = 228g

25 moles of oxygen weigh = 25 × 32g/mol

                                         = 800g

Thus 228 g of octane reacts with 800 g of Oxygen.

20 g of octane reacts with  g of Oxygen.

                                 = [tex]\frac{800}{228} *20 = 70.2 g of oxygen[/tex]

What is combustion in a reaction?

combustion, a reaction between substances, usually including oxygen and typically accompanied by the generation of heat and light in the form of flame.Examples of Combustion Reactions

Imagine the wood burning during a fireplace. The wood is fuel which continuously reacts with oxygen within the air in a combustion reaction. the hearth produced is energy being released in a long exothermic reaction, while the smoke you see is CO2

What is the product of combustion reaction?

For a combustion reaction, the products will always be CO₂ (CO₂ C O 2 ) and water (H₂O H 2 O ). Combustion reactions always have two products: CO₂ and water.

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The complete sentences are as follows:

The molar concentration of a chemical specie in a solution, specifically the amount of a solute per unit volume of solution, is measured.

The most commonly used unit of molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units.

The number of moles of the solute present in one liter of solution is referred to as molarity. In layman's terms, 1 mole equals the atomic weight of the substance. 1 mole of acetic acid, for example, is equivalent to 60.05 g of acetic acid (molecular weight = 60.05). Method of calculation: Values that are well-known Glacial acetic acid density 1.049 g/ml.

Acetic acid is also used in the chemical reaction that yields purified terephthalic acid (PTA), which is used in the production of PET plastic resin, which is used in synthetic fibers, food containers, beverage bottles, and plastic films. Solvents: Acetic acid, like ethanol, is a hydrophilic solvent.

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irreducible complexity is the idea that many molecular machines are simply too complex to have formed via evolution.

What is irreducible complexity?

According to the irreducible complexity (IC) theory, no less complex system would function if some biological systems had evolved by natural selection from a series of minor adjustments to pre-existing functional systems. The creationist theory of intelligent design has made irreducible complexity a core tenet, whereas science rejects both intelligent design and the idea of irreducible complexity. One of the two primary defences of intelligent design, along with specified complexity, is known as irreducible complexity.

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The mass of the precipitate (AgCl) formed when 45.0 ml of 1.200 m of aqueous silver nitrate was mixed with 120.0 ml of 0.850 m of aqueous magnesium chloride is 7.73928 g.

Precipitate refers to the insoluble ionic solid products of a reaction. The formation of precipitate occurs when certain cations and anions combine in an aqueous solution.

To know the mass of the precipitate formed when aqueous silver nitrate and aqueous magnesium chloride are mixed, first is to get its balanced chemical reaction.

[tex]MgCl_{2(aq)} +2AgNO_{3(aq)}= 2AgCl_{(s)} +Mg(NO_{3} )_{2(aq)}[/tex]

This is a precipitation reaction where AgCl is the precipitate.

If the 45.0 ml aqueous silver nitrate has a concentration of 1.200 M, then
moles of solute = concentration x liters of solution

moles of AgNO3 = 1.200 mol/L x 0.045 L

moles of AgNO3 = 0.054

If the 120.0 ml aqueous magnesium chloride has a concentration of 0.850 M, then

moles of solute = concentration x liters of solution

moles of MgCl = 0.850 mol/L x 0.120 L

moles of MgCl = 0.102

From the balanced reaction, the mole ratio of the reactants and products are:

1 : 2 : 2 : 1

1 mole magnesium chloride mixed with 2 moles silver nitrate will produce 2 moles silver chloride and 1 mole magnesium nitrate

If there are 0.054 moles AgNO3, then it should react with 0.027 moles MgCl. The calculated number of moles of MgCl is in excess, thus making the AgNO3 the limiting reagent. The amount of product formed is limited by this reagent.

If there are 0.054 moles AgNO3, mixed with excess MgCl will produce 0.054 moles AgCl.

To solve for its mass, use the formula for its molar mass.

mass = molar mass x moles

mass AgCl = 143.32 g/mol x 0.054 moles AgCl

mass AgCl = 7.73928 g

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Nuclear fission splits an atom apart, while nuclear fusion fuses two atoms together. Option B.

In nuclear fission, a heavy nucleus or atom splits into smaller and lighter nuclei or atoms. Energy is released during this process as well.

In contrast, nuclear fusion has to do with the coming together of 2 or more light nuclei or atoms to form a single heavy nucleus or atom. This process requires that energy is consumed.

Thus, nuclear fission can be thought of as a process that splits an atom apart, while nuclear fusion fuses two atoms together.

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Answer:

Acetone will vaporize from the mixture before water.

Explanation:

You have mentioned that the bp of water is 100°C and the bp of acetone is 56°C.We know that in the distillation process of mixture the substance having low bp vaporizes,condenses and gets collected in the separete container before the one having high bp.So the one having high bp remains in the original container and that is water.

Thus, the second option is correct.

The theoretical yield of SnS₂ will be 4.20 gram can be produced using the following reaction

From the equation of the reaction:

The mole ratio of the reactant is 1:2.

Mole of 35.2 mL, 0.419 M SnBr₄  = 0.419 x 35.2/100 = 0.147 mols

Mole of 51.1 mL, 0.203 M Na₂S = 0.203 x 51.1/1000 = 0.0103 moles

Thus, Na₂S is in excess while SnBr4  is limiting.

Mole ratio of SnBr₄  and SnS₂ = 1:1

Equivalent mole of SnS₂ = 0.023 moles

Mass of 0.023 moles SnS₂ = 0.023 x 182.81 = 4.20 grams

The quantity of a product obtained from a reaction which is expressed in terms of the yield of the reaction. the quantity of product predicted by stoichiometry is called the theoretical yield, whereas the quantity obtained actually is called the actual yield.

A limiting reagent may be a chemical reactant that limits the amount of product that is formed. The limiting reagent gives the littlest yield of product calculated from the reagents (reactants) available. This smallest yield of product is named the theoretical yield.

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Fats or oils are created when the hydroxide group of glycerol combines in a dehydration synthesis process with the carboxyl group of fatty acids.

Your body loses more fluids when you are dehydrated than you are taking in. If unattended to, it could get worse and become a serious problem.

When you don't drink enough water or lose more than you take in, you become dehydrated. Sweat, tears, vomiting, urination, and diarrhea all cause fluid loss. Climate, level of physical activity, food, and other variables can all affect how severe dehydration is.

Dark urine, decreased urination, headaches, weariness, dry skin, decreased skin turgor, and poor focus are all indicators of dehydration.

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The correct option (D) Gamma ray. The Gamma-ray has the greatest penetrating ability among alpha, beta, gamma, and positron radiation.

The various emissions have very different levels of penetrating ability, also known as piercing power. A particle is the least incisive due to its size and slow emission. It can be blocked by a piece of paper or a human hand. Beta particles, which are more invasive than alpha particles, can be stopped by a small layer of metal.

Of the three main categories of emissions, gamma particles are the most harmful. A strong lead shield must be used to block gamma radiation. Fermions are a special case since they entirely disappear when they interact with electrons. The penetrating power of radioactive emissions is demonstrated by the generation of two 180-degree-distance gamma emissions as a result of an electron-positron collision.

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Answer:

7

Explanation:

yeah you just need to add 2 grams of potassium to 5 grams of oxygen

To solve this question we must know the concept of stoichiometry. Thus, 2.355ggrams of K₂O can be produced from 2 grams of K and 5 grams of O₂. option c is correct option

Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.

The balanced equation is

4 K + O₂ → 2 K₂O

From stoichiometry we can draw the following information

K: 4 moles

O₂: 1 mole

K₂O: 2 moles

The molar mass of the compounds is:

K: 39.1 g/mole

O₂: 32 g/mole

K₂O: 94.2 g/mole

The mole of respective molecule is

K: 2g÷39.1 g/mole= 0.05mole

O₂: 5g ÷32 g/mole= 0.15mole

K will be the limiting reagent.

4 mole of K produces= 2 mole of K₂O

1 mole of K produces=1/2 mole of  K₂O

0.05 mole of K produces = (1/2)×0.05

                                          = 0.025mole

mass of  K₂O=  94.2 g/mole×0.025mole =2.355g

Thus, 2.355ggrams of K₂O can be produced from 2 grams of K and 5 grams of O₂. option c is correct option

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A can of Red Bull provides the perception of increased energy because it contains a very high level of sugar and caffeine.

A methylxanthine class stimulant, caffeine stimulates the central nervous system (CNS). It is employed as a cognitive enhancer to improve alertness and attentional function. In order to increase the release of the neurotransmitter acetylcholine, caffeine works by preventing adenosine from attaching to the adenosine A1 receptor. Through nonselective inhibition of phosphodiesterase, caffeine also raises levels of cyclic AMP.

Chemically related to the adenine and guanine bases of ribonucleic acid and deoxyribonucleic acid (DNA), caffeine is a bitter, white crystalline purine known as a methylxanthine alkaloid (RNA). Many plants native to Africa, East Asia, and South America include it in their seeds, fruits, nuts, or leaves. By limiting the germination of neighboring seeds, it aids in protecting these plants from herbivores and competition.

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For elementary reaction, coefficients in a balanced chemical equation are the same as the exponents in the rate law.

For elementary reactions, the order of the elementary reaction is that the same as its molecularity. In contrast, the speed law cannot be determined from the balanced chemical equation for the overall reaction

Do coefficients affect reaction rate?

But the coefficient affects the worth of rate constant K. the worth of the coefficient k changes with the conditions that affect reaction rate, like temperature, pressure, area , etc. A smaller rate constant value shows that the reaction is slow, while a bigger rate constant indicates a faster reaction.

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The balanced net ionic equation when aqueous solutions of Al(NO₃)₃ and Na₃PO₄ are mixed is:

Al³⁺(aq) + PO4³⁻(aq)(aq) → AlPO₄(s)

Balanced molecular chemical equation:

Al(NO₃)₃ (aq) + Na₃PO₄(aq) → AlPO₄(s) + 3NaNO₃(aq)

The balanced ionic equation:

Al³⁺(aq) + 3NO₃⁻(aq) + 3Na⁺(aq) + PO₄³⁻(aq) → AlPO₄(s) + 3Na⁺(aq) + 3NO₃⁻(aq)

The balanced net ionic equation: Al³⁺(aq) + PO₄³⁻(aq) → AlPO₄(s)

Aluminium phosphate (AlPO₄) is a white solid inorganic compound.

(s) is solid state of matter.

(aq) is aquatic solution

This is an example of the double replacement reactions (double displacement or metathesis reactions), two ionic compounds are exchanged, making two new compounds.

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Answer:

A. 3

____________________________________________
What are significant figures?

Significant figures are used to establish the number which is presented in the form of digits. These digits carry a meaningful representation of numbers. The term significant digits are also used often instead of figures. We can identify the number of significant digits by counting all the values starting from the 1st non-zero digit located on the left. For example, 12.45 has four significant digits.

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Have a WONDERFUL day! (:

Answer: A

Explanation:

1.89 ==> 1 + 8 + 9 ==> 3 sig figs ==> A

A typical atom's diameter is 10,000 times greater than its nucleus' diameter, and the nucleus is where the majority of the mass and density of the atom are concentrated.

At the center of each atom, there is a tiny, dense area known as the nucleus. It has a net positive charge because it is made up of positive protons and neutral neutrons. Although the nucleus only makes up a very small portion of the atom, it is where almost all of its mass is found.

A positively charged nucleus and one or more negatively charged particles known as electrons make up an atom. The atom has no excess of electrons because the positive charges cancel out the negative charges, making it electrically neutral.

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Answer:

6.156099 × 10^12

The volume of the balloon after he heats it to a temperature of 250.0°C is 0.718L.

The volume of a balloon at a particular temperature can be calculated by using the Charles law formula as follows:

V1/T1 = V2/T2

Where;

According to this question, a man heats a balloon in the oven. The balloon initially measures 0.402L with a temperature of 20.0°C. However, the volume of the balloon after he heats it to a temperature of 250.0°C can be calculated as follows:

0.402/293 = V2/523

523 × 0.402 = 293V2

210.25 = 293V2

V2 = 210.25/293

V2 = 0.718L

Therefore, the volume of the balloon after he heats it to a temperature of 250.0°C is 0.718L.

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An indicator dye called bromothymol blue (BMB) turns yellow in the presence of an acid. The pH of the solution is lowered when carbon dioxide is added because carbonic acid is formed as a result.

An indicator dye called bromothymol blue (BMB) turns yellow in the presence of an acid. The pH of the solution is lowered when carbon dioxide is added because carbonic acid is formed as a result.

Bromothymol blue with concentrated hydrochloric acid is the magenta color on the left. Bromothymol blue can be used as a respiratory indicator or for monitoring photosynthetic processes (turns yellow as CO 2 is added). Exhaling via a tube into a neutral BTB solution is a typical way to demonstrate BTB's pH indicator abilities.

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The class to which the compound present in several foods with the formula C44H86O8NP belongs to is lipids.

What are class of compounds?

Compound Classification Compounds can be divided into ionic and covalent classes based on how they form. When a metal and a non-metal come together, ionic compounds are created. Due to the presence of ions, they are also known as electrovalent compounds.

The MMPE compound is the one that makes up the chemical's molecule. Monomethylphosphatidylethanolamine is referred to as MMPE. It is a member of the lipids class and is found in a variety of foods.

Thus the molecule belongs to the class of lipids.

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The volume of the stock solution is 6.25 mL.

Stock solutions are manufactured by the technician or pharmacist and have a known concentration for ease of dispensing.

A closed surface-enclosed three-dimensional space's volume is measured physically.

12 molar of HCl is required to make 500 ml of 0.15 liters.

The number of moles n of HCl can be calculated as:

c = n / V

n = c × V

n = 0.15 M × 500 ml

n = 0.15 M × 500 × 10⁻³

n = 0.075 moles HCl

Now, the volume of the stock can be calculated using the number of moles of hydrochloric acid.

c = n / V

V = n / c

V(stock) = 0.075 moles / 12 M

V(stock) = 0.075 moles / (12 moles/ L )

V(stock) = 0.00625 L

V(stock) = 0.00625 × 10³ mL

V(stock) = 6.25 mL

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The flame test uses the distinctive color that salt gives the flame of a Bunsen burner to help visually identify an unknown metal or metalloid ion. The metal ions become excited atoms due to the flame's heat, and these excited atoms release visible light.

An orange-red flame test color is produced by a sample of an ionic chemical. Find the metal ion that is present. Pour a clean wire loop into a solid sample of the substance being tested to conduct a flame test.

Place the loop into the edge of a Bunsen burner's blue flame.

examine and note the hue of the flame that is produced.

The flame test's colors are a result of the electrons' excitement as a result of the elevated temperature.

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Plasmas that heat up at the same temperature as their surroundings.

In the substance known as plasma, a large number of electrons are free to move about among the atomic nuclei. The fourth state of matter, after solid, liquid, and gas, has been referred to as plasma. In a sample of matter that is solid, liquid, or gaseous, the electrons typically stick with the same atomic nucleus.

Although plasmas resemble gases, their atoms differ because they are composed of free electrons and ions of an element like neon (Ne). When you look around, you don't come across spontaneously occurring plasmas very frequently. They aren't occurrences that occur frequently on Earth.

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Maximum Kinetic energy is 10.2

A photoelectron's maximum kinetic energy at a particular frequency. = ℎ − , m an x, where h is that the Planck constant, f is that the frequency of the incoming photon, and W is that the work function of the metal surface, gives the maximal K.E. of a photo electron.

Measurements are made of the cross section for the elastic scattering of electrons with energies lower than 10.2 eV by free hydrogen atoms. A dc beam crossed an atomic hydrogen beam that was chopped at a low frequency in an experiment that was similar to Bederson's in that a signal was produced from the electrons dispersed by the particles in the neutral beam.

The signal from the electrons that were dispersed by the beam appeared at the modulation frequency and at a predetermined phase, with their identification.

The ratio of the hydrogen atom's and therefore the molecule's cross sections was directly measured, and absolute values for the atomic cross section were calculated using absolutely the molecular cross-section.The experimental findings support the thought .

Electron energy within the ground state is 0.13.6

Second energy level: 3.4; overall energy state difference: 10.2

Thus, K.E. equals 10.2.Therefore, we are aware that some electron K.E. was transmitted to the hydrogen atom during an elastic collision.

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The pH of the solution formed by adding 4.3 * 10^-5 moles of KOH in one litre of water is 9.6.

Given:

No. of moles of KOH = 4.3 * 10^-5 moles

Volume of solution = 1L

Molarity = No. of moles / Volume of solution

          M = 4.3 * 10^-5 / 1

          M = 4.3 * 10^-5

p[OH] = -log[OH^-]

p[OH] + p[H] = 14

pH = 14 - pOH

pOH = 14 - pH

14 - pH = -log(4.3 * 10^-5)

14 - pH = 4.3

pH = 14 - 4.3

pH = 9.6

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The no. of atoms comprise the motif of a fcc orb.

14 unit atoms make up 1 unit cell

256 atoms will make up 256/14 unit cells. = 18 unit cells.

What is an fcc lattice?

In the FCC structure, there are six atoms in the centre of each of the six unit cell faces and eight atoms in each of the unit cell's eight corners. Consequently, 8 + 6 = 14 atoms make up a unit cell.

One of the most typical atomic arrangements in pure solids is the Face-Centered Cubic (FCC) crystal structure. FCC has an APF of 0.74 because it is tightly packed. FCC is also incredibly ductile and has 12 distinct slip systems.

The number of atoms in a face-centered cubic unit cell is four. A line that runs diagonally from a cube's top corner to its bottom corner on the same side of the cube is equivalent to 4r.

14 unit atoms make up 1 unit cell

Thus, 256 atoms will make up 256/14 unit cells. = 18 unit cells.

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