5. Part of a human body system is pictured. The main function of this system is to —

The concentration measures will change in value as the temperature of a solution changes is molarity. The correct option is 4.

The molarity of a substance refers to how much of it is present in a given volume of solution (M). Molarity is the measure of how many moles of a solute are present per liter of a solution. Molarity is also referred to as a solution's molar concentration.

To find the equation for molarity, divide the volume of solvent used to dissolve the given solute by the number of moles of that solute. M = n V

Since the volume of the solution rises as the temperature rises, molarity decreases. Therefore, molarity is normally affected when therefore is a change in temperature of a solution either when it increases or decreases.

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Erwin Schrodinger is the scientist who created the present theory of the atom, which states that electrons are found in areas known as orbitals or electron clouds.

He proposed the treatment of electrons as matter waves in the quantum mechanical model of the atom. In 1926, Erwin Schrodinger created the "Electron Cloud Model." It was made up of an electron cloud with many different orbital levels surrounding a dense nucleus. He determined areas around the nucleus that are most likely to contain electrons based on his estimates. He referred to these areas as orbitals. "Lobes" are a term used to describe the likelihood of finding electrons in orbitals. This atomic model is a representation of an atom that has a small, massive nucleus that is encircled by a cloud of electrons that are travelling quickly.

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During chemistry class, carl performed several lab tests on two white solids. The results of three tests are seen in the data table. Based on this data, carl has concluded that substance b must have ionic bonds.

The complete transfer of certain electrons from one atom to another results in the formation of an ionic connection. A negatively charged ion known as a cation results from an atom losing one or more electrons. An anion, or negatively charged ion, is created when an atom gains one or more electrons.

If the electronegativity of the two atoms differs by enough to allow one to totally draw an electron away from the other, the connection is ionic. Compounds that mix elements from the left-hand side of the periodic table frequently encounter such circumstance (sodium, potassium, calcium, etc.)

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Answer: thunderstorms

Explanation:

Answer:

c.

Explanation:

the closest would be C.

1N = 0.10197 kg

1 kg = 9.81 N

9.81×72.5=711.225

Any area that has been treated with talcum powder or skin lotion must be rubbed with alcohol to remove the residue and facilitate the adherence of the leads.

This is referred to as a substance which is derived from the fermentation of sugar under anaerobic conditions and it usually has an intoxicating effect.

However, it is also used for other purposes such as skin care and is usually applied after it has been treated with talcum powder or skin lotion so as to remove the residue and facilitate the adherence of the leads thereby making alcohol the correct choice in this scenario.

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The amount, in liters, of water needed to be added to prepare 1000 mL of 0.3 M NaCl from a 5 M NaCl stock solution would be 0.94 L.

According to the dilution principle, the number of moles of solutes before dilution must be equal to the number of moles of solutes after dilution. This is mathematically expressed as:

[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]

Where [tex]m_1[/tex] and [tex]m_2[/tex] are molarities before and after dilution, and [tex]v_1[/tex] and [tex]v_2[/tex] are volumes before and after dilution.

In this case, [tex]m_1[/tex] = 5 M, [tex]m_2[/tex] = 0.3 M, [tex]v_2[/tex] = 1000 mL.

Let's find [tex]v_1[/tex]:

[tex]v_1[/tex] =  [tex]m_2v_2[/tex] /[tex]m_1[/tex]

  = 0.3x1000/5

  = 60 mL

In other words, the volume of the stock solution to be taken is 60 mL. This volume has to be diluted by water to the 1000 mL mark. Thus, the amount of water to be added would be:

1000 - 60 = 940 mL

940 mL = 0.94 L

In summary, 0.94 L of water will be required to prepare the solution.

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If two  different samples of matter are measured in each of these glass containers and Both of the containers show the same measure for both samples of matter. They would have same volume in common

The space occupied inside an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.

The capacity of a thing is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim.

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Complete question unfound

Answer:

To calculate acceleration due to gravity using a pendulum, you need to measure the length of the pendulum in meters and the average period of the pendulum's swing in seconds. Once you have these measurements, you can use the following formula to calculate acceleration due to gravity:

g = 4π^2L/T^2

where g is the acceleration due to gravity, L is the length of the pendulum in meters, and T is the average period of the pendulum's swing in seconds.

For example, if the length of the pendulum is 1 meter and the average period of the pendulum's swing is 2 seconds, the acceleration due to gravity would be calculated as follows:

g = 4π^2(1)/(2)^2 = 4π^2/4 = π^2 = 9.87 m/s^2

Therefore, the acceleration due to gravity on Earth would be approximately 9.87 meters per second squared.

Increasing order of boiling point of the given molecules is

Benzene< Benzaldehyde<Phenol<Benzoic acid.

Boiling point is directly proportional to intermolecular forces.

The intermolecular forces present in the given molecules are.

so, as benzene is nonpolar , only weak london dispersion force is present. Hence boiling point of benzene is least among the given molecules. Benzaldehyde is polar, so dipole -dipole force is also present. But no H-bonding is present. Hence, boiling point of benzaldehyde is less than that of phenol and benzoic acid. Now, both phenol and benzoic acid is polar as well as they can form H-bonding. But phenol can only form intermolecular hydrogen bonding, but benzoic acid can form both intermolecular as well as intramolecular H bonding. So it can exist as dimer. The presence of dimer further strengthen the vander Waals dispersion forces , that increases the boiling point of Benzoic acid.

Hence increasing order of boiling point of the given molecules is

Benzene< Benzaldehyde<Phenol<Benzoic acid.

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the half-life of plutonium-234 is 9 hours. if 80 milligrams is present now, 80/(3.2^8)  will be present in 3 days.

3 days = 72 hrs= 8 half lives, amount remaining after 't' half lives is 80(1/2^t), amnt after 70 hrs = 80(1/2^8)., amnt after 79 hrs = 80(1/2^9).

amnt decayed in the 9th half life is 80((1/2^8)-(1/2^9))=80(1/2^9)., amnt decayed from 70 hrs to 72 hrs = (2/3)(70/2^9). amnt remaining after 72 hrs = 80(1/2^8) - (2/3)(80/2^9) = 80/(3.2^8) ans

The half-life of a quantity is the time it takes to decrease to half of its original value. In nuclear physics, the term is frequently used to define how quickly atoms undergo radioactivity or how long steady atoms stay alive. The term is also used to describe any form of exponentially decaying in general. The half-life is then determined by calculating to use the fundamental description of activity, which is defined as the good or service of the radionuclide decay constant, as well as the amount of radioactive atoms present, N. One solves for and obtains the half-life from the equation = ln2/T1/2.

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The electrons in an atom are depicted in orbital diagrams in visual form. For creating orbital diagrams, three rules are helpful.

Each electron resides in the orbital with the , in accordance with the Auf Bau Principle.

According to the Pauli Exclusion Principle, an orbital can hold no more than two electrons. According to Hund's rule, electrons enter various orbitals within a single sub-level before doubling up within orbitals.

We have seen how the quantity and kind of valence electrons play a crucial role in establishing the chemical characteristics of a specific element. Due to their propensity to lose their single valence, Group 1A metals are extremely reactive.

Therefore, The electrons in an atom are depicted in orbital diagrams in visual form. For creating orbital diagrams, three rules are helpful.

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The molarity of HCl is 1.0 M. the volume of HCl is calculated as follows:

The volume of HCl = Number of moles/Molarity

0.017 mol/1.0 mol/L

= 0.017 L

=17 mL

Since the total volume of the buffer solution is 1 L. The volume of water is calculated as:

The volume of water = 1 - Volume of HCI

= 1-0.017

= 0.983 L

Hence, to prepare a phosphate buffer, 7.1 g of Na, HPO4, 17 mL of HCl, and 0.983 L of water are mixed together.

Phosphate-buffered saline is a commonly used buffer in biological research. This is an aqueous saline solution containing disodium hydrogen phosphate, sodium chloride, and in some formulations potassium chloride and potassium dihydrogen phosphate. Buffers help maintain a constant pH.

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The following statement is false about crystal field theory : the color of a coordination compound is the color of light absorbed.

Crystal field theory (CFT) describes how a static electric field produced by a surrounding charge distribution breaks degeneracies of electron orbital states, usually d or f orbitals (anion neighbours).

Hans Bethe, a physicist, developed the crystal field theory (CFT) for crystalline solids in 1929.

The following is how Crystal Field Theory explains the colors of coordination compounds: The splitting of a d-orbital into multiple orbitals is known as crystal field splitting. When white light strikes the compound, an electron moves into a higher state, absorbing a specific wavelength of light.

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Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option A.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Chemicals in the paint absorb light energy in a process called phosphorescence, radioactive elements keep the glow going.

Therefore, the correct option is option A.

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The reaction would be endothermic since heat flowed INTO the system

The temperature of the water bath would down since heat left the water and entered the system

The piston would move in since it is doing work ON the system.

The reaction would absorb energy since both heat and work are being done ON the system

∆E = q + w = 270. kJ + 365. kJ = 635 kJ of energy absorbed by the reaction

How hot or cold something is can be expressed numerically using the physical concept of temperature. Temperature is measured with a thermometer.

Different temperature scales, which traditionally established various reference points and thermometric materials, are used to calibrate thermometers. The most widely used scales are the Kelvin scale (K), which is mostly used in science, the Fahrenheit scale (°F), and the Celsius scale, also referred to as centigrade and denoted by the unit symbol °C. The kelvin is one of the seven base units in the International System of Units (SI).

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A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1atm. The cylinder is also submerged in a large insulated water bath.

The temperature of the water bath is monitored, and it is determined from this data that  270.kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 365.kJ of work on the system during the reaction.

a) Is the reaction endo- or exo- thermic?

b) Does the temp. of the water bath go up or down?

c) Does the piston move in or out?

d) Does the reaction absorb or release energy?

e) How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits.

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The density of an unknown gas is 2.00 grams per liter at 3.00 atmosphere pressure and 127oc.the molar mass of this gas is 21.87 g/mol.

given that :

density , d = 2 g/L

pressure P = 3 atm

temperature , T = 127 °C

the ideal gas equation is given as :

P V = nR T

and d = m / V

where,

m = mass

V = volume

Molar mass M = m/n

now the equation becomes :

P V / m = n R T / m

P / d = R T / M

M = d R T / P

M = ( 2 g/L × 0.082 L atm / mol K × 400.15 K ) / 3 atm

M = 21.87 g / mol

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3741.3 J is the total random kinetic energy of all the molecules in one mole of hydrogen at a temperature of 300 k.7482.6 m/s is the speed of a mole of hydrogen have to move so that the kinetic energy of the mass as a whole would be equal to the total random kinetic energy of its molecules

At 300 K, the total random kinetic energy of all the molecules in one mole of hydrogen is 3741.3 J. The speed at which a mole of hydrogen must move in order for its kinetic energy to equal the total random kinetic energy of its molecules is 7482.6 m/s. The average kinetic energy of gas molecules is determined by absolute temperature, according to kinetic theory. At a specific temperature, all gases share the same average kinetic energy". Kinetic energy = 3/2 * RT = 3/2 8.314 * 300 = 3741.3 J,KE = 1/2 m v2,v2 = 2 KE/m = 2* 3741.3/1.

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The lactic acid has a pka equal to 3.86. the fraction of total lactic acid will be dissociated to lactate at pH 7.0 is 1.3 × 10³.

given that :

pH = 7.0

the pka value for the lactic acid = 3.86

according to the Henderson hasselbalch we get :

pH = pka + log [ H] / [HA]
substituting all the values ,we get

pH = pka + log [ H] / [HA]

7 = 3.86 + log [ H] / [HA]

log [ H] / [HA] = 3.14

[ H] / [HA] = 10 ^ 3.14

[ H] / [HA] = 1380.3

[lactate]/ [lactic acid] = 1.3 × 10³

thus, the ratio of the [lactate]/ [lactic acid] = 1.3 × 10³

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The molar mass of caf2 is 78.075 g/mol is 4.14 x 10^ -11.

CaF2 (s) <----> Ca2+ (aq) + 2F- (aq)

At equilibrium [Ca2+] = S , [F-] = 2S , where S is amount of CaF2 dissolved i.e solubility.

The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a material is a bulk attribute rather than a molecular one.

given S = 1.7 x 10^ -2 g/L = 0.017 g/L

we can convert g/L to mol/L by dividing S with Molar mass of CaF2

S in mol / L = (S in g/L) / ( CaF2 molar mass) = ( 0.017g/L) / ( 78.07g/mol) = 0.000218 mol /L

[F-] = 2S = 2 x ( 0.000218) = 0.000436 mol/L

now Ksp = [Ca2+] [F-]^2

= ( 0.000218 ) (0.000436 )^2

= 4.14 x 10^ -11

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992 millimoles of zinc nitrate the chemist has added to the reaction flask.

Zinc nitrate is an inorganic compound with the formula Zn(NO₃)₂. This colorless, crystalline salt is extremely hydrophilic. it's generally encountered as a hexahydrate Zn(NO₃)₂·6H₂O. it's soluble in each water and alcohol. Zn Nitrate may be a colorless or white, odorless, crystalline (sand- like) solid or flake. it's used as a catalyst and a mordant for dyes, and in liquid plant food.

Chemists and materials scientists study substances at the atomic and molecular levels and analyze the ways that within which the substances move with each other. They use their information to develop new and improved product and to check the standard of factory-made product.

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A chemist adds 435.0mL of a 2.28 M zinc nitrate ZnNO32 solution to a reaction flask. Calculate the millimoles of zinc nitrate the chemist has added to the flask. Round your answer to 3 significant digits.

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There are 2 O atoms are in Ammonium acetate ( CH₃COONH₄ ).

Ammonium ( NH₄⁺ ) comes from Ammonia ( NH₃ ) :

NH₃ + H⁺ → NH₄⁺ ( Ammonium ion )

Acetate ( CH₃COO⁻ ) comes from Acetic acid ( CH₃COOH ) :

CH₃COOH → CH₃COO⁻ + H⁺

Ammonium acetate :

NH₄⁺ + CH₃COO⁻ = CH₃COONH₄

Here, Ammonium ion does not have any O atom and acetate have 2 o atoms,

0-O + 2-O = Total number of atom O

Total number of atom O = 2

So, the right option is B. 2, there are 2 O atoms are in Ammonium acetate ( CH₃COONH₄ ).

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-23.4kj is  the standard gibbs free energy associated with the formation of ammonia from nitrogen and hydrogen at 25 c and 500 c

-

The temperature is 25 deg C or 298 K.

ΔGo =−RTlnK=−8.314×298×ln1.3×104 =−23469J=−23.4kJ

Hence, the standard free energy change is -23.4 kJ

Gibbs free energy, thermodynamics The word "free energy" refers to a thermal potential that can be utilized to determine the maximal amount of work that a thermodynamically closed system can perform at constant pressure and temperature. The change in limitless energy that occurs when a chemical is created from its components in their most thermodynamically states under appropriate conditions is referred to as the free basic energy of formation. Ammonia is a colourless gas that has a strong suffocating odour. It easily dissolves in the water, forming an ammonium hypochlorite that can cause discomfort and burns. Under pressure, ammonia gas compresses easily and formation a clear, colourless liquid.

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Answer:

Gravity

Explanation:

The adding of an acid or base to a buffer seems to have no effect on the pH of the buffer. In contrast, going to add acid or base to unbuffered water drastically changes the pH.

Any hydrogen-containing substance skilled of making a donation a proton (hydrogen ion) to that other substance is defined as an acid. A base is a compound or ion that really can accept an acid's hydrogen ion. The sour flavours of weak acids is generally described by the contaminant that emits hydrogen ions in water and formation salts by incorporating with these metals. Acids have a bitter aftertaste and cause certain dyes to turn red. buffer is an aqueous solution that withstands adjustments in pH upon on the addition of either an acid or a base". Furthermore, adding water to a buffer or going to allow it to evaporate from of the buffer has no significant effect just on pH of the buffer.

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If XeF2 is polar or nonpolar based on the Lewis Structure and the molecular geometry (shape).

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If atoms were smaller, Planck's constant would be smaller.

Planck's constant is the proportionality constant  pertaining to a photon's strength to its frequency. a particle representing a quantum of mild or different electromagnetic radiation. A photon contains strength proportional to the radiation frequency however has 0 relaxation mass. The constant  offers the connection among the strength of a photon and its frequency, and through the mass-strength equivalence, the connection among mass and frequency. This constant is directly proportional to the number of atoms. therefore if atoms were smaller, Planck's constant would be smaller.

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The volume of 0.175M sodium sulfate solution that is necessary to completely react with 35.0 mL of 0.112M silver nitrate is 22.4mL.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The volume of a solution can be calculated using the following expression:

CaVa = CbVb

Where;

According to this question, 0.175M sodium sulfate solution completely reacts with 35.0 mL of 0.112M silver nitrate. The volume required for this reaction to occur can be calculated as follows:

0.175 × Va = 35 × 0.112

0.175Va = 3.92

Va = 3.92/0.175

Va = 22.4mL

Therefore, 22.4mL is the volume of the sodium sulfate needed.

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Answer:

The answer is 95.8 grams.

Explanation:

To solve this problem we need to use dimensional analysis. We have the amount in moles and want to find the mass in grams, so we need a conversion factor. This conversion factor is also given to us and allows us to "convert" between grams and moles. The dimensional analysis is modeled below:

2.0 mol * (47.9 g/1 mol) = 95.8 g

Notice how since we have the unit of moles in the numerator and the denominator, these will cancel out, yielding an answer expressed in grams.

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Answer: Diurnal temperature range is the difference between __maximum______ and ____minimum____ temperature each ___1 day______.

Explanation: