Calculate density
Mass = 23.6 g
Volume = 30.0 cm³

Lithium has two isotopes. Lithium-6 has a atomic mass 6.01512 amu and Lithium-7 has a atomic mass 7.01601 amu. The average atomic mass of Lithium is 6.941 amu.

Let's take the relative abundance of Lithium-6 as X and the relative abundance of Lithium-7 as Y. The sum of the relative abundances is always taken to be 1.

X+Y=1

X=1-Y

The average atomic mass can be expressed as the following, based on the atomic masses and relative abundance of the two isotopes

6.941 = X(mass of Li-6) + Y(mass of Li-7)

6.941= 1-Y(6.01512) + Y(7.01601 )

from the above equation, Y=0.92506

Solving for X

X=0.07494

Therefore, the relative abundance of lithium-7 is 92.506% and that of lithium-6 is 7.494%

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The model is completed by inserting the sodium and the chloride ions in alternate positions.

It is common to show the arrangement of atoms or ions in a substance by the use of models. In the realm of science, a model could be used for the purpose of explanation or for the purpose of prediction. It is also possible to use a model as the way that we can be able to underscore and understudy the properties of a molecule.

Now we know that sodium chloride is an ionic compound. The ionic compounds are crystalline. This implies that the ions are arranged in a regular and a repeating pattern which enables the substance to have a definite shape as well as a high melting and a high melting point.

It then follows from the image that the ions of sodium and chlorine do occupy alternate positions in the solid in order to maximize the interaction between the ions. It then follows that the model is completed by inserting the sodium and the chloride ions in alternate positions.

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The nonelectrolyte is a substance that has been known to not ionize in an aqueous solution. The molar mass of the unknown compound at the freezing point of −1.80 ° C is 180.833 g/mol.

The freezing point has been the estimate of the temperature at which the substance is said to change its phase from the liquid to the solid state. It is just the opposite of the melting point.

Given,

ΔTc = -1.8 °C

Kc water = 1.86 °C.Kg/mol

Mass solvent =  100.0 g = 0.1 Kg

Mass solute = 17.5 g

Mass of solution = mass of solute + mass of solvent = 117.5 gm

Molality (m) is calculated as:

molality = solute (mol) ÷ solvent (Kg)

m = ( - 1.8 °C) ÷ ( - 1.86 °C.Kg/mol)

m = 0.9677 mol/Kg

Molar mass can be calculated from molality as:

moles of solute = molality × solvent

moles = 0.9677 mol/Kg × 0.100 Kg H2O

= 0.09677 mol

Now, moles and mass are used to calculate molar mass as:

Molar mass = mass ÷ moles

= 17.5 g  ÷ 0.09677 mol

= 180.833 g/mol

Therefore, the molar mass of the unknown substance is 180.833 g/mol.

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Answer:

0.25 g/cm

Explanation:

First, you multiply 10 *10 *10 and you get 1000. Then you divide it by 4000 and since 1000 is 1/4 of 4000 you get 0.25 or 1/4.

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The statement which is best supported by the table (see attachment) is: D. Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.

A wave can be defined as a disturbance in a medium that progressively transfers (transports) energy from a source to another location, especially without the transportation of mass (matter).

In Science, there are three (3) main types of wave and these include the following:

A longitudinal wave is the opposite of a transverse wave and it can be defined as a type of wave that usually travel in the same direction of its oscillation. Thus, the motion of a longitudinal wave is parallel to wave motion.

A transverse wave can be defined as a type of wave in which particles of the medium of propagation oscillates or vibrates (up and down) in a direction that is perpendicular to the direction that the wave moves i.e at right angle to the direction of propagation of the wave.

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Answer:

Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.

//D edge 2023//

Explanation:

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Law of definite composition: As long as something has the same formula, its mass will be the same.

According to the Law of Definite Proportions, a chemical compound will always include the same weight proportions of each element, regardless of the quantity or source. For instance, 21.5 grammes of carbon and 28.5 grammes of oxygen make up a 50-gram sample of carbon monoxide.

Ibuprofen is a medication used to treat pain, fever, and inflammation, and is a member of the nonsteroidal anti-inflammatory drug (NSAID) family. This includes menstruation pain, migraines, and rheumatoid arthritis. The patent ductus arteriosus of a premature newborn can also be sealed with this technique.

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The temperature of liquid nitrogen (LN), an inert cryogenic fluid, is 196 °C (320 °F). To drop the temperature of the concrete as much as is possible without causing it to freeze, LN is directly injected by lances into the batch water storage tank, the aggregate, or the mixer.

Cryopreservation is the process of preserving live cells, tissues, and other biological samples by placing them in a deep freezer at extremely low temperatures. The sample is typically stored at 196°C or lower. All of a cell's biological processes come to an end at such low temperatures, and the cell dies.

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Titration has been the process to estimate the unknown volume by the known amount of the concentration and volume. 230 mL of HBr is required to reach the halfway point.

The dilution formula can be used to estimate the unknown volume through the half-neutralization of the acid and base in the titration process. The final volume can be estimated by the known amount of HONH₂.

The formula is given as:

M₁V₁ = M₂V₂

Given,

Volume of HONH₂ (V₁) = 230 mL

Molar concentration of HONH₂ (M₁) = 0.4000 M = 0.2000 M

Molar concentration of HBr (M₂) = 0.2000 M

Volum of HBr = V₂

Substituting values as:

230 ml × 0.2000 M = 0.2000 M × V₂

V₂ = 230 mL

Therefore, 230 mL HBr is the volume at halfway point.

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Explanation:

Bromine is a halogen in group VII A of the periodic table with atomic number 35,an atomic weight of 79.91, and a density of 3.12 Mg.In the solid state it forms a cubic crystal with a melting point of -72 C and boiling point of 58 C.

Bromine's liquid state at 25°C indicates melting point below 25°C and boiling point above 25°C.

The observation of bromine being a liquid at 25°C reveals important details about its melting and boiling points. Since it exists as a liquid at this temperature, it signifies that its current state is beyond its melting point.

Therefore, bromine's melting point is below 25°C. However, since bromine has not transitioned into a gaseous state at 25°C, it indicates that its temperature is still below its boiling point. This suggests that the boiling point of bromine lies above 25°C.

The relatively narrow temperature range between its melting and boiling points makes bromine unique among elements and allows it to exist as a liquid at room temperature.

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Percentage yield = 87.3%

How to find percentage yield ?

As ,the reaction is :

4Fe + 3O2 →2Fe2O3

Molar mass of Fe = 55.8 g

Molar mass of Fe2O3= 159.6 g

According to the balanced equation :

This is the theoretical mass obtained .

Actual mass is 4.77

So, % yield is = (actual /theoretical )/100 =( 4.77/5.46 )/100 = 87.3%

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Explanation:

[tex] \frac{p1v1}{n1t1} = \frac{p2v2}{n2t2} (ideal \: gas \: equation) \\ \frac{v1}{t1} = \frac{v2}{t2} \\ convert \: degrees \: to \: kelvin \: \\ \frac{1.5l}{297k} = \frac{v2}{373k} \\ v2 = 1.88l \\ it \: increased \: by \: 80\%[/tex]

The concentration of copper in the solution is

[tex]5.1 \times 10^{18} \: M.[/tex]

The volume of the solution = 1.00 L

[tex]Moles \: of \:Cu(NO_{3}) _{2} = 2.50 \times 10 {}^{ - 4} [/tex]

[tex]Moles \: of \: Ethylenediamine = 1.20 \times 10.3[/tex]

[tex]k _{f} = 1.00 \times 10^{20} [/tex]

Overall balanced equation of reaction is,

[tex]Cu^{2 + }(aq) \: + 2en \: (aq)→ Cu(en) ^{2 + }_{2}(aq)[/tex]

[tex]Moles \: of \:Cu(NO_{3}) _{2} =0.00025 \: mol[/tex]

Mole ratio for,

[tex]Moles \: of\:Cu(NO_{3}) _{2}: en[/tex]

[tex]2: 1[/tex]

[tex]Moles \: of \: en = 0.000250 \times 2[/tex]

[tex] = 0.00050 \: moles[/tex]

Remained moles of en are= (0.00120-0.000500)

[tex] = 0.000700 \: moles[/tex]

The concentration of copper in the solution is,

[tex]k_{f} = \frac{Cu(en)^{2 + }_{2} }{Cu^{2+}en^{2} }[/tex]

[tex]1.00 \times 10 ^{20} = \frac{0.000250}{(Cu )^{2 +} \times (0.000700)^{2 + } }[/tex]

[tex] = 5.1 \times 10^{18} \: M.[/tex]

Therefore, the concentration of copper in the solution is

[tex]5.1 \times 10^{18} \: M.[/tex]

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The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

Rocks are of different types such as metamorphic, igneous, and sedimentary rocks.

Rocks that are more pliable, porous, or permeable weather more quickly than tougher rocks. Rocks weather more quickly in hot regions than in chilly ones.

In comparison to other rocks, rocks having minerals that break down slowly in water will weather more quickly. The rate of weathering increases with the amount of water present.

Therefore, The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

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The total electron charge contained in this volume of water is 8.565 x 10⁷c.

N total = N mole (10e⁻ / molecule) Nₐ

Nₐ = 6.022 x 10²³ molecules / mole

N mole = mass / molecular weight

= Vp / mol wt

= (1.6 × 10⁻¹⁹ c) (10³ kg /m³) / 18 g / mole (10⁻³ kg/g)

= 88.89 moles

N total = N mole (10e⁻ / molecule) Nₐ

N total = 88.89 moles (10e⁻ / molecule) (6.022 x 10²³ molecules / mole)

N total = 5.353 x 10²⁶e⁻

Q total = N Total (-e)

Q total = (5.353 x 10²⁶) (1.6 × 10−19 c )

Q total = 8.565 x 10⁷c

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Melting occurs when a solid changes state into a liquid.

Fusion occurs when a liquid changes state into a solid.

(So, basically, they are opposite of each other)

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Is Fe+S classified as as compound

Iron and sulfur are both elements from the periodic table of elements each one has its own unique physical and chemical properties iron is a metal, and sulfur is a nonmetal. when these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide when iron and sulphur are mixed then the reaction is called as redox reaction or oxidation reduction reaction in that reaction Fe loses electron that is Fe is undergoing in oxidation and we know that the substance which itself undergo oxidation act as a reducing agent so in this case Fe is the reducing agent. Fe+S is a compound because compound means the substance made from two or more different element that have been chemically joined and mixture means made up of two or more chemical component that are not chemically joined called mixture so given iron sulphide is a compound.

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4.83 M is the concentration of the original lead.

DILUTED and CONCENTRATED SOLUTIONS:

A solution is diluted when more solvent is added so that the concentration is lowered, whereas a solution is concentrated when solvent is removed from the solution so that the concentration increases. The removal of solvent can be done by evaporation. Both these processes involve the a change in the volume of the solution to cause a change in the concentration of the solution. This means that the same tools can be used to determine the concentration of a concentrated solution as would be done if it was a diluted solution.

The balanced reaction equation is:

[tex]Pb(NO_3)_2 (aq) + 2NaCl(aq) \rightarrow PbCl_2(s) + 2NaNO_3(aq)[/tex]

The molar mass of lead (II) chloride is 278.106 g/mol. The number of moles of lead(II) chloride is:

[tex]n = \frac{3.451 g}{278.106g/mol}[/tex]

[tex]n = 0.01241 mol[/tex]

The ratio between lead (II) chloride and lead (II) nitrate is 1:1 which means there was 0.0124mol of lead (II) nitrate in the solution. The concentration of lead (II) nitrate is:

[tex]M = \frac{0.01241 mol}{0.00200 L}[/tex]

[tex]M = 6.20mol/L[/tex]

This means the concentration of lead (II) nitrate in the partially evaporated solution is 6.20mol/L. The concentration of the original solution is:

[tex]M_1 V_1 = M_2 V_2[/tex]

[tex]M_1 = \frac{M_2 V_2}{V_1}[/tex]

[tex]M_1 = \frac{(6.20 M)(0.0779 L)}{0.1000 L}[/tex]

[tex]M_1 = 4.83 M[/tex]

Thus, the concentration of the original lead is 4.83 M.

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Comparison of techniques for GABA-edited MR spectroscopy data spectral alignment and signal modeling.

There are many ways to align and quantify magnetic resonance spectroscopy (MRS) data in order to assess -aminobutyric acid in vivo (GABA). Because there are few ground-truth measurements available, there is little research comparing the performance of different approaches. In comparison to white matter, the concentration of GABA is almost twice as high in grey matter.

Here, we assess the performance of four spectral alignment approaches (i.e., retrospective frequency and phase drift correction) and six GABA signal modeling methods using the percentage of grey matter present in the MRS voxel as a proxy for ground-truth GABA concentration.

The alignment to the creatine (Cr) signal generates GABA+ estimates that account for around twice as much of the diversity in grey matter as the next highest performing alignment approach, according to our analysis of a broad dataset of 432 MEGA-PRESS scans targeting several brain areas.

Additionally, Cr alignment produced the fewest outliers and was the strongest. As opposed to this, all signal modeling techniques—aside from the single-Lorentzian model—performed equally well.

Our findings indicate that rather than frequency originating from first-order phase offsets within subspectra, performance variability is predominantly caused by variances in the zero-order phase calculated by each alignment method.

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The mass of the object could now be obtained as 45 Kg.

We define the term gravity as the force that drags an object down to the center of the earth. We know that every object that is found on earth has a mass. The mass of the object means that it is acted upon by the force of gravity.

Again we can obtain the weight of the object as the influence of the gravitational force on an object. In fact we define the weight of the object as the gravitational force that acts on an object. As such, the gravitational force or the weight of the object is given in Newton’s.

Given that;

Weight = mass * acceleration due to gravity

Mass = Weight/ acceleration due to gravity

Weight of the object = 441N

Acceleration due to gravity = 9.8 m/s^2

Mass of the object = 441N/9.8 m/s^2

= 45 Kg

The mass of the object could now be obtained as 45 Kg.

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The positive-positive repulsion is expected to slow the particles down slightly as they travel through the atoms since the plum pudding model predicts that the positive charge is distributed evenly throughout the atom. However, we do not anticipate any deflection of the particles.

The Rutherford model was not accepted.

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813.2 torr was computed as the value.

Air pressure is the force of the air around us, whereas atmospheric pressure is the force of the earth's atmosphere. Tore gauges are used to measure air pressure, while mercury barometers are used to measure atmospheric pressure. The planet's gravitational pull on the gases above its surface produces atmospheric pressure, which depends on the planet's mass, the radius of its surface, the quantity, composition, and vertical distribution of the gases in the atmosphere.

Factor of conversion: 760 Torr per atm

Torr = 1.07 Atm 760

Torr = 813.2

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The symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.

For writing the electronic configuration of any element by using the preceding noble gas configuration, we simply use the symbols of noble gas belongs to the previous period of that particular elements. We can't use the symbol of noble gas of same period from which the element belong.

A is the wrong option because the noble gas in the preceding period to the period from which antimony belongs is krypton.

The actual electronic configuration of antimony is as follow:

[Kr] 4d10 5s2 5p3

B is correct option because the noble gas in the preceding period to the period from which Cesium belongs is Xenon.

The actual electronic configuration of Cesium is as follow:

[Xe] 6s1

Thus, we concluded that the symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.

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1. The right atrium 2. veins 3. lungs 4. heart valves. 5. pulmonary artery   6. Lungs 7. pulmonic valves 8. left atrium.

Circulation is the process by which your heart continuously pumps around five liters (eight pints) of blood throughout our body. our cardiovascular system is made up of our heart, blood, and blood arteries (or heart and circulatory system). Because the majority of the oxygen has been used up by the body and brain, the right side of the heart receives blood that is deficient in oxygen. our lungs then take in a new supply of oxygen as a result of this being pumped to them. In order to be pumped back out to the brain and the rest of our body, the blood then travels back to the left side of the heart.

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The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

The molarity(M) of a solution can be expressed by the following formula,

Molarity(M) = Mass of solute/Molar mass of solute x 1000/Volume of the solution

We are given that, the molarity of a solution containing 22.5 grams of oxalic acid(Molar mass= 90 g) is 0.3 M.

Putting these values in the given formula, we can calculate the volume of the solution

0.3 = 22.5/90 x 1000/V

V = 22.5/90 x 1000/0.3

V = 833.3 ml.

Thus, The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

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Mole fraction of ethylene is = 0.144  

How to find mole fraction ?

As, Given that vapor pressure = 7.88 torr

pure water vapor pressure = 9.21 torr

∆P solvent = (X Solute)(Pº solvent)

∆Psolvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr

Xsolute = mole fraction of the solute = ?

Pºsolvent = vapor pressure of the pure solvent = 9.21 torr

1.33 torr = (Xsolute)(9.21)

Xsolute = 1.33 torr/9.21 torr)

Xsolute = 0.144

Hence the mole fraction of ethylene is = 0.144  

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