8. At STP, 4.00 L of a pure gaseous substance has a mass of 10.0 grams. The molecular weight of this substance is?

Body systems work together to maintain the entire organism then the body response to the running mile is then the breathing may become heavy as well as pulse quicken as heart pump harder

According to the given data body temprature from starting it is 98.6°F (37°C) and the ending data is 99.1°F (38°C) and pulse and heart rate is from starting 80 bpm and ending it is 120 bpm and respiration rate is from starting 18 bpm and the ending it is 28 bpm and sweating in starting is normal and in the ending it is increase and skin temprature in starting is 91°F (33°C) and ending is 92.5°F (35°C) so when the student start to run the heat or temprature in the body is normal but when the student run a mile the temprature as well as pulse and heart rate and respiration rate is also increases

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An unknown metal is exposed to flame by chemists during a flame test. Based on the type of metal present in the substance, the flame will change color. Once the chemical is identified, the scientists can proceed.

The simplest method for determining whether group 1 metal ions are present in the chemical is a flame test. There are several effective methods for other metals, but a flame test will give you a better idea of what to look for.

Chemists place an unidentified metal under a flame as part of a flame test. Depending on whatever metal is present in the substance, the flame will take on a variety of colors. Thus, the mystery material can be identified by the scientists.

Metals have observable characteristics that are particular to each one, much like all other elements, such as density, boiling temperature, melting point, and specific heat. These characteristics can be utilized to identify unknown metal samples since they are special.

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The smallest molecule in the group, fluorine, or F2, will have the weakest London dispersion forces and the lowest boiling point.

The strength of the intermolecular forces of attraction that a molecule's components exhibit determines its boiling point. In our situation, you must determine how three nonpolar molecules' boiling temperatures relate to one another. The elements that make up group 17 of the periodic table, or the halogens, exist as diatomic molecules. These molecules won't display strong London dispersion forces because they are nonpolar. As a result, since bromine, Br2, is the largest molecule in the group, you may anticipate that it will display the strongest London dispersion forces have the greatest point of boiling.

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An element's electronegativity determines whether it is ionic or non-ionic. Fluorine has the most electronegativity while iodine has the lowest, which means that the Cs I ionic bond's power of attraction is at its lowest, allowing for the largest possible distance between their molecules.

The attracting and repellent forces that develop between the molecules of a substance are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces act as a bridge between the individual molecules of a substance. Intermolecular forces are primarily responsible for the physical and chemical properties of matter.

The following are the four main intermolecular forces: Van der Waals dipole-dipole interactions < Van der Waals dispersion forces <Ionic bonds <Hydrogen bonds .

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For miscible : Poler will be miscible in polar.

                       Non polar will miscible in non polar .

1) C8H18 and C6H6      ( Both are non polar , miscible)

2) H2SO4 and H2O      (  Ionic and  polar  ,  miscible )

3) CS2 and CCl4            ( Both are non -polar , miscible )

4) Na3PO4 , and H2O      ( Salt ionic and polar , miscible )

A liquid is a almost incompressible fluid that conforms to the form of its field however keeps a regular extent impartial of strain. As such, it's miles one of the 4 essential states of remember, and is the only country with a specific quantity but no constant shape.

The atoms in a liquid are loose to transport around, although they can't pass closer collectively or farther apart. This means a liquid flows and modifications shape to fill the space around it.

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The absorbance of a solution that absorbs 45.0% of incident 500nm is equal to 0.26.

Absorbance can be defined as the logarithm of the ratio of incident light to transmitted light through a sample. Absorbance may also be defined as the negative logarithm of one minus transmittance, as measured on a uniform sample.

If I₀  is the intensity of the incident light  and 'I' is the intensity of the light detected after traveling a distance 'd', the fraction transmitted T, is given by:

[tex]A = log\frac{I_o}{I}[/tex]

Given, the light absorbed by the solution = 45%

The radiation incident on the solution, I₀ = 100 %

The radiation transmitted by the solution = 100 - 45 = 55%

The absorbance of the solution is given by: A = log (I₀/I)

A = log (100/55)

A = 0.26

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Answer: frequency= speed of light * wavelength

1.44799757×10*11

Explanation:

Answer:

1.95 atm or 197 kPa*

Explanation:

To find the new pressure, you need to use the Combined Gas Law:

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the new pressure, volume, and temperature. Before using the equation, you need to:

(1) convert the pressure from kPa to atm (101.3 kPa = 1 atm)

(2) convert the temperatures from Celsius to Kelvin (°C + 273 = K)

You can then plug these values into the equation and solve for "P₂".

P₁ = 106 kPa / 101.3 = 1.05 atm                  P₂ = ? atm

V₁ = 6.5 L                                                     V₂ = 3.6 L

T₁ = 19°C + 273 = 292 K                              T₂ = 27°C + 273 = 300 K

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]                                               <----- Combined Gas Law

[tex]\frac{(1.05 atm)(6.5L)}{292K}=\frac{P_2(3.6L)}{300K}[/tex]                            <----- Insert values

[tex]0.0234=\frac{P_2(3.6L)}{300K}[/tex]                                       <----- Simplify left side

[tex]7.01 = P_2(3.6L)[/tex]                                         <----- Multiply both sides by 300

[tex]1.95 = P_2[/tex]                                                   <----- Divide both sides by 3.6

*1.95 atm x 101.3 = 197 kPa

197 kPa or 1.95 atm is a new pressure, you must apply the Combined Gas Law to determine the new pressure.

The starting pressure, volume, and temperature are denoted in this equation by "P1", "V1," and "T1," respectively. The new pressure, volume, and temperature are denoted by the letters "P2", "V2," and "T2". You must: before applying the equation:

(1) convert pressure to atm (101.3 kPa = 1 atm)

(2) Use the formula °C + 273 to convert temperatures from Celsius to Kelvin.

After that, you may solve for "P2" by plugging these numbers into the equation.

P1 = 101.3 kPa / 106 kPa = 1.05 atm P₂ = ? atm

V₁ = 6.5 L V₂ = 3.6 L

T₁ = 19°C + 273 = 292 K T₂ = 27°C + 273 = 300 K

Therefore, 1.95 atm X 101.3 = 197 kPa

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Answer: False

Explanation: Eggs are produced during ovulation once a month when someone has a period.

The pencil is the earth that rotates about its axis to give day and night.

A model can be regarded as a representation of reality. The model can be used for the purpose of prediction or for the purpose of explanation. In this case, we are trying to use the model for the purpose of explanation.

The whole pencil can be said to represent the globe and the lamp can stand for the sun. The part of the pencil that is exposed to the amp is the part of the earth that is exposed to the sun and has daylight while the other part of the globe would experience darkness.

The rotation of the pencil would denote the rotation of the earth that leads to the occurrence of day and night.

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When 0.1 mol of PCls (g) is heated at 78.5°C in a 1.00 L container, the pressure at equilibrium is 3.50 x 10⁵ Nm² so the degree of dissociation of PCIs is 60%

Dissociation is the breaking up of a compound into simpler constituents that are usually capable of recombining under other conditions.

Here given data is

Temprature = 78.5 °C

Pressure = 3.50 x 10⁵ Nm²

We have to calculate the degree of dissociation of PCI₅ = ?

Then the equation of dissociation of PCl₅ when heated is given below

PCl₅ → PCl₃ + Cl₂

Based on the equation of the dissociation of PCl₅ the 1 mole of PCl₅ decompose to give 1 mole of PCl₃ gas and 1 mole of Cl₂ gas

Hence 1 mole of  PCl₅ dissociates to give 2 mole of gas

So 0.1 mole of PCl₅ will dissociate to give 0.1×2moles of gas = 0.2 moles of gas

At STP the pressure of 0.2 mole of gas is calculated as follow

PV = nRT

Where P = pressure = ?

V = 1.00 L

n = number of moles = 0.2

R = molar gas constant = 0.082 L atm/kmol

T = temprature = (273 + 78.5)K

P = nRT

P = 0.2×0.082×351.5/1

P = 5.76 atm or 5.84×10⁵N/m²

Percentage dissociation of PCl₅ = (3.50×10⁵/5.84×10⁵)×100%

Percentage dissociation of PCl₅ = 60%

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A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 30.9 °C. the pressure in the gas tank then was 5.43 atm

According to gay lussac law :

P1 / T1 = P2 / T2

P1 = 5 atm

P2 = ?

T1 = 273 + 5 = 278 K

T2 = 273 + 30.9 = 303.9 K

now, P1 / T1 = P2 / T2

5 / 278 = P2 / 303.9

P2 = 5.43 atm

Thus, A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 30.9 °C. the pressure in the gas tank then was 5.43 atm

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Taking into account the reaction stoichiometry ,0.0140625 moles of Ba₃(PO₄)₂ can be produced if 275 mL of 0.250 M BaCl₂ is added to 225 mL of 0.125 M Na₃PO₄.

In first place, the balanced reaction is:

3 BaCl₂(aq) + 2 Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6 NaCl(aq)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

In this case, you know:

So, the amount of moles of each reagent can be calculated as:

moles of BaCl₂= Volume of BaCl₂× Molarity of BaCl₂

moles of BaCl₂= 0.275 L× 0.250 M

moles of BaCl₂= 0.06875 moles

moles of Na₃PO₄= Volume of Na₃PO₄× Molarity of Na₃PO₄

moles of Na₃PO₄= 0.225 L× 0.125 M

moles of Na₃PO₄= 0.028125 moles

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 2 moles of Na₃PO₄ reacts with 2 moles of Na₃PO₄, 0.06875 moles of BaCl₂ reacts with how many moles of Na₃PO₄?

amount of moles of Na₃PO₄= (0.06875 moles of BaCl₂× 2 moles of Na₃PO₄)÷ 2 moles of Na₃PO₄

amount of moles of Na₃PO₄= 0.04583 moles

But 0.04583 moles of Na₃PO₄ are not available, 0.028125 moles are available. Since you have less moles than you need to react with 0.06875 moles of BaCl₂, Na₃PO₄ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 2 moles of Na₃PO₄ form 1 mole of Ba₃(PO₄)₂, 0.028125 moles of Na₃PO₄ form how many moles of Ba₃(PO₄)₂?

amount of moles of Ba₃(PO₄)₂= (0.028125 moles of Na₃PO₄× 1 mole of Ba₃(PO₄)₂)÷ 2 moles of Na₃PO₄

amount of moles of Ba₃(PO₄)₂= 0.0140625 moles

Then, 0.0140625 moles of Ba₃(PO₄)₂ can be produced.

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There are 5.02 *10²² molecules in 12 grams of water.

What is a molecule?

This refers to two or more atoms joined by chemical bonds. egH₂0.

What is molecular weight?

This refers to the total weights of the individual atoms that comprise the molecule.

How to calculate number of molecules in a chemical compound.

.Calculate the molecular weight of the substance for one mole.

. Divide the molar mass value by the molecular mass.

. Finally, multiply by the Avogadro constant.

Recall,

1 mole of a subtance= 6.022×10²³ atoms(Avogadro's Law)

Hence calculating the number of molecules in 12g of H₂0 we have:

1 mole of H₂0=(1*2) +(8*2)

                      18g

18g of  H₂0 contains 6.022×10²³ atoms

Then 12g of  H₂0 contains:

number of molecules=Number of atoms /mass of H₂0

                                    =6.022×10²³/12

                                     =5.02×10²²

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Answer:

A its has 63 protons

B mass number is also 124

C Atomic number of x is 63

Explanation:

The spectroscope has changed the way scientists looked for elements in that it allows for the identification of elements from compounds without a need to decompose the compounds.

A spectroscope also known as a spectrometer is an instrument that produces and analyzes the spectra or absorption lines using visible light.

The spectrometer measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter.

These measurements are obtained or determined from the wavelength or frequency of the radiation.

A spectroscope is used to analyze and study the elemental components of compounds without having to decompose the compounds into elemental substances.

Thus, spectroscopes have proved to be useful in the study of the properties of elements in compounds.

Compounds are formed when two or more elements are combined together.

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Organic Chemistry Laboratory Manual 7A and 7B V.4.1

The formula for percent error is the absolute value of the difference between the measured value and the actual value divided by the actual value multiplied by 100. The purpose of calculating percent error is to analyze how close the measured value is to the actual value. teeth. This is part of a comprehensive error analysis.

For most fields, the percentage error is always expressed as a positive number but for other fields, it is legal to have positive or negative values. Sampling error is calculated by dividing the standard deviation of the population by the square root of the sample size and multiplying the result by a z-score based on the confidence interval.

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Hope this answer helps you a lot ✅✅

Answer:

cool

Explanation:

The variable that gets manipulated is Aluminium.

Hot water has more energy than cold water so the sugar dissolves faster in hot water than in cold water. When water is heated, the molecules gain energy and move faster. Because they move faster, they come into contact with the sugar more often dissolving it faster. I can do it. Changing the amount of water will affect the plant growth rate values.

Therefore, we know that the amount of water is the independent variable and the plant growth rate is the dependent variable. The energy from the hydrothermal molecules makes the solid more soluble. In hot water, molecules move more so there are more collisions between water molecules and solids.

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The audience that President Reagan appeals to in this part of the speech is  : "the American people" (Option A)

An audience is a group of people who read a certain piece of work. As a writer, you should anticipate your audience's wants or expectations in order to transmit information or argue for a certain position.

Knowing your audience helps you decide what information to include, how to arrange that information, and what type of supporting elements are required for the reader to grasp what you are presenting. It also has an impact on the tone and organization of the document.

The audience for a literary review is often composed of people of the writer's own discipline. However, these discipline colleagues may not be experts in the specific topic or problem addressed in the literature study.

The evidence in the text that indicates that the speaker is addressing the American People are:

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There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the angles can be found out by VSEPR theory.

VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.

According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element.

Angle A:120 since lone pair is in conjugation with the ring so sp² hybridized.

Angle B:120, sp² hybridized

Angle C:180, sp hybridized

Angle D:109.5 sp³ hybridized

Angle E:120, sp² hybridized

Therefore, the angles can be found out by VSEPR theory.

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The correct electron dot diagram for Al is Al with three dots. The option A is the correct option.

Aluminum is one of the element of the periodic table. It belongs to 13th group. The atomic number of aluminum is 13 and mass number is 26. The electronic configuration of aluminum is 1s1 2s2 2p6 3s2 3p1.

Since there are three electron in the lass shell. Therefore to obtain stable electronic configuration aluminium lose three electron. Since, last electronic configuration is 3 p. Thus, it belongs to p block and 3rd period.

The number of electron dot on an element is depend on the valancy of that particular atom. Let's learn with an example of Na. It has 11 as atomic number and have valancy 1. So, the dot present on Na symbol is one. In the same way, the aluminum has 3 valancy. So, the number of dots present is three.

Thus, we concluded that the correct electron dot diagram for Al is Al with three dots. The option A is the correct option.

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Carbon has a half-life of 5,730 years.

The rate of deterioration, or pastime, of a sample of a radioactive substance, is lower within the wide variety of radioactive nuclei in line with unit time.

The decay rate is expressed as a percent. We convert it to decimal through surely reducing the percentage and dividing it by means of 100. Then calculate the decay element b = 1-r. for example, if the rate of deterioration is 25%, the exponential characteristic's decay price is zero.25 and the decay thing b = 1- 0.25 = 0. seventy-five.

The rate of nuclear decay is also measured in terms of half of-lives. The 1/2-lifestyles is the amount of time it takes for a given isotope to lose half of its radioactivity. If a radioisotope has a 1/2-existence of 14 days, half of of its atoms will have decayed within 14 days.

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The new volume (in L) is 12.2 L

Information given:

Volume 1 = 15.0 L

Temperature 1 = 298 K ---------> Temperature 2 = 383 K

Pressure 1 = 3.36 Atm -----------> Pressure 2 = 5.308 Atm

Information they're asking: New Volume 2?

Substituting it with numbers (Yay! we were provided Kelvins, that's always a plus), we get;

3.36 Atm * 15.0 L * 383 K = V2  = 12.2 L

298 K * 5.308 Atm

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Answer:

mitochondria

Explanation:

mitochondria is an organelles that is used in cellular respiration and makesbenetgy

The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.

A component of an element is an atom. A specific element only has one kind of atom per atom. Protons, neutrons, and electrons, which are subatomic particles, make up the remainder of an atom. Chemical reactions can result in the combination of elements to create molecules. The number assigned to a chemical element by its atomic number in the periodic system places the elements in ascending order of the number of protons in their nuclei.

The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.

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The solution's freezing point is 1.65°C.

The freezing point depression formula is: Adding a solute to the original solvent causes the freezing point to decrease.

ΔT = kf×m×i

Where m is the molality of the solution (Moles CaBr2 -solute- / kg water -solvent), Kf is the freezing point depression constant of the solvent (1.86°C/m), and I is the Van't Hoff factor.

Molality of the solution is:

moles CaBr₂ = 193.9g ₓ (1mol / 199.89g) = 0.97 moles

Molality is:

0.97 moles CaBr₂ / 3.27kg water = 0.296m

For CaBr2, the van't hoff factor indicates how many moles of solute are generated following the dissolution of one mole of solid solute:

CaBr₂(s) → Ca²⁺ + 2Br⁻

1 mole of solid solute yields 3 moles of ions, and the Van't Hoff factor is 3.

ΔT = kf×m×i

ΔT = 1.86°C/m×0.296m×3

ΔT = 1.651

Water loses 1.65°C of its freezing point. Water's 0°C freezing point means that

The solution's freezing point is 1.65°C.

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Answer:

Calcium chloride in its anhydrous form is an economical drying agent and very important for drying processes in laboratories. Those are for example: drying of liquids and neutral gases. It is also a very good drying agent for a wide variety of solvents.

Calcium chloride compound in its anhydrous form is an economical drying agent and very important for drying processes in laboratories.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions.They make up the drying agent used to absorb the moisture.They have a unique chemical structure held together by chemical bonds .Molecular compounds where in atoms are joined by covalent bonds.

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Chemical formula Na2CO3 is ionic compound and CO is covalent compound.

The chemical formula of a compound is a symbolic representation of its chemical composition. The components of a compound's molecules are identified in its chemical formula, as well as the ratio in which its atoms combine to produce those molecules. For instance, a molecule of water has the molecular formula H2O, which indicates that it contains two hydrogen atoms and one oxygen atom.

A substance's molecular formula can be used to estimate the amount of its constituent constituents. In molecular formulae, the elements are denoted by the symbols from the periodic table, and the number of atoms in each element is denoted by a subscript. For instance, the molecular formula for glucose is C6H12O6.

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