_____ is the process of an atom giving up or gaining one or more electrons through its interactions with other atoms.

Answer : The mass of nitrogen gas collected is, 290.9 grams

Explanation :

To calculate the mass of nitrogen gas we are using ideal gas equation:

[tex]PV=nRT\\\\PV=\frac{w}{M}RT[/tex]

where,

P = pressure of nitrogen gas = 1 atm

V = volume of nitrogen gas = 250 L

T = temperature of nitrogen gas = [tex]20^oC=273+20=293K[/tex]

R = gas constant = 0.0821 L.atm/mole.K

w = mass of nitrogen gas = ?

M = molar mass of nitrogen gas = 28 g/mole

Now put all the given values in the ideal gas equation, we get:

[tex](1atm)\times (250L)=\frac{w}{28g/mole}\times (0.0821L.atm/mole.K)\times (293K)[/tex]

[tex]w=290.9g[/tex]

Therefore, the mass of nitrogen gas collected is, 290.9 grams.

Answer:

e. Na, Fe, K

Explanation:

The group of elements that will be positive charge ions is metal. You can find metal in the first 2 columns of the periodic table and in the transition area. Natrium/sodium (Na), iron (Fe), and kalium/potassium(K) categorized as metal and they will form positive charge ions.  

On the other hand carbon(C),  oxygen (O), arsenic(As) and bromine(Br) is gas and will form negative charge ions. Gas located on the right side of the periodic table.

The elements that readily form positively charged ions, or cations, are more often metals like Sodium (Na), Iron (Fe), and Potassium (K). Therefore, the correct answer from the options given is 'Na, Fe, K'. option e.

The elements that form cations, or positively charged ions, readily are elements that tend to lose electrons. This characteristic is typically associated with metals. In the options given, Na (Sodium), Fe (Iron), and K (Potassium) are the ones which are more likely to form cations. So, the correct answer to your question: 'Which of the following elements form cations (positively charged ions) readily: C, O, Na, Fe, As, Br, K?' would be option e. Na, Fe, K.

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Except for __________, the following statements about blood are true.

a.The viscosity is three to five times greater than water.

b The pH is slightly acidic.

c. It contains about 55% plasma.

D. It contains dissolved gases.

Except for the pH is slightly acidic, the following statements about blood are true.

Viscosity is an inherent feature of liquid compared to the inner resistance of nearby fluid films pushing through one another. All blood has a much greater viscosity than water.  Authorities regard these matters as “non-Newtonian fluids,” of which ketchup and blood are excellent illustrations.

Blood is usually slightly basic, with a typical pH scale of approximately 7.35 to 7.45. Plasma composes 55% of the whole blood volume. The albumin included in plasma restricts the blood from dropping too much water. The plasma of vertebrates also includes dissolved gases.

Blood is a fluid connective tissue that is 92 percent water. It is slightly more acidic, viscous, and salty than water.

Blood is a fluid connective tissue composed of plasma, dissolved substances, and blood cells. It is about 92 percent water, making the statement provided true. However, blood is slightly more acidic than water, slightly more viscous than water, and slightly more salty than seawater, making these statements false. Red blood cells carry oxygen, white blood cells defend the body, and platelets help blood clot.

Answer:

The correct answer is No, it would boil at 109.13°C

Explanation:

This question can be solved by knowing the boiling point elevation formula and the fact that ethylene glycol dissolves in water without dissociation

The boiling point elevation formula is given by

ΔT = i × [tex]K_{b}[/tex] ×[tex]m_{solute}[/tex]

Where [tex]K_{b}[/tex] = 0.51 °C/mole

i = Vant't Hoff factor

m = molality of the solution

When ethylene glycol, C2H6O2, (antifreeze) enters into solution in water it disociates into

C2H6O2 (aq) ---> 2OH(-1)(aq) + C2H4(+2)(aq)

Thus one mole of C2H6O2 dissociates into two moles of hydroxyl ions and one mole of C2H4(+2) ion

Hence the Van't Hoff factor, i, = 3

Therefore the mass of the mole

Therefore ΔT = 3 × 0.51 × 17.9 = 27.387 K

However Ethylene formula = (CH2OH)2 it dissolves in water without dissociation

Therefore i = 1

and ΔT = 1 × 0.51 × 17.9 = 9.129 ≅ 9.13

Hence at the boiling point of the water with antifreeze dissolved in it it

Boiling point of water + Boiling point elevation = 100 + 9.13 = 109.13 °C

The water will not boil until it reaches 109.13 °C

The coolant mixture will not boil at 108°C. The calculated boiling point elevation suggests it will boil at approximately 109.16°C, based on the molality and the boiling point elevation constant for water.

To determine whether the coolant mixture in your car will boil at 108°C, we can use the concept of boiling point elevation. The boiling point of a solution increases when a solute is added to a solvent due to the colligative properties of the solution. Using the molality provided (17.9m), and knowing the boiling point elevation constant (Kb) for water is approximately 0.512 °C/m, we can calculate the boiling point elevation.

ΔTb = i * Kb * m

Where ΔTb is the boiling point elevation, i is the van't Hoff factor (i = 1 for ethylene glycol as it does not dissociate in solution), Kb is the ebullioscopic constant for water, and m is the molality of the solution.

ΔTb = 1 * 0.512 °C/m * 17.9m = 9.16 °C

The normal boiling point of water is 100°C, so adding the elevation to the normal boiling point gives us:

100°C + 9.16°C = 109.16°C

Therefore, the solution will not boil at 108°C because it would boil at approximately 109.16°C.

Answer:

a) 2

b) 1/4

c) 9

Explanation:

a) for a first order reaction in reactant A

r initial = k*[A initial]

then if the concentration is doubled [A final ]= 2*[A initial]  , then

r final = k*[A final ] = 2* k*[A initial] = 2*r initial

then the velocity changes by a factor of 2

b) for a second order reaction in reactant B

r initial = k*[B initial]²

then if the concentration is halved: [B final ]= [B initial]/2  , then

r final = k*[B final ]²  = k*( [B initial]/2 )²  =k* [B initial]² /4 = r initial /4

then the velocity changes by a factor of 1/4

c) for a second order reaction in reactant C

r initial = k*[C initial]²

then if the concentration is tripled : [C final ]= 3* [C initial]  , then

r final = k*[C final ]²  = k*( 3*[C initial] )²  =k* [C initial]² *9 = 9 * r initial  

then the velocity changes by a factor of 9

For first-order reactions, doubling the concentration of the reactant doubles the reaction rate. For second-order reactions, halving the concentration reduces the rate by a factor of four, while tripling the concentration increases the rate by a factor of nine.

(a) For a reaction that is first order in reactant A, if [A] is doubled, the rate of the reaction will also double. This is because the rate of a first-order reaction is directly proportional to the concentration of the reactant. When [A] is doubled, the rate is doubled as well.

(b) For a reaction that is second order in reactant B, if [B] is halved, the rate of the reaction will decrease by a factor of four. This is because the rate of a second-order reaction is directly proportional to the square of the concentration of the reactant. When [B] is halved, the concentration is squared and the rate is decreased by a factor of four.

(c) For a reaction that is second order in reactant C, if [C] is tripled, the rate of the reaction will increase by a factor of nine. Similar to the previous case, the rate of a second-order reaction is directly proportional to the square of the concentration of the reactant. When [C] is tripled, the concentration is squared and the rate is increased by a factor of nine.

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Final answer:

Silicon dioxide, or silica, is integral to microelectronics as an electrical insulator and is used in applications such as isolation, gate insulation, and dopant diffusion. Chemical Vapor Deposition is commonly used to deposit silica thin films. The material's tetrahedral structure ensures stability under rapid temperature changes, vital for semiconductor industries.

Explanation:

Silicon dioxide (SiO2), often referred to as silica, plays a crucial role in the world of microelectronics. Its excellent electrical insulating properties make it essential for various applications within semiconductor devices. Silicon dioxide is employed for the isolation of conductive layers as well as for its dielectric properties which are used in gate insulation. Moreover, it serves to facilitate the diffusion of dopants from oxides and as a means to prevent the loss of dopants when capping films.

The Chemical Vapor Deposition (CVD) method is widely used for depositing thin layers of SiO2 during semiconductor processing. This is due to the unique challenges associated with its application in creating insulating thin films. Additionally, silica's unique diamond-like network structure allows for rapid temperature changes, making it invaluable in the steel, electronic, and semiconductor industries.

Silica's three-dimensional tetrahedral structure, where silicon atoms are bonded to oxygen, confers stability and resilience that is crucial for the high temperature processes involved in microelectronic device fabrication. Different forms of silicon dioxide, such as quartz and fused silica, contribute to the diversity of silica's properties and applications. Its naturally abundant presence and the numerous crystalline forms it can take, underscore the material's importance to technology and industry.

Answer:

The answer to your question is   2NaCl  + 2H₂O    ⇒   2NaOH  +  Cl₂  +  H₂

Explanation:

Original chemical equation

                   NaCl  +  H₂O    ⇒   NaOH  +  Cl₂  +  H₂

                   Reactant      Element        Products

                       1                    Na                    1

                       1                    Cl                      2

                       2                    H                      3

                       1                     O                      1

This reactions is unbalanced

                2NaCl  + 2H₂O    ⇒   2NaOH  +  Cl₂  +  H₂

                   Reactant      Element        Products

                      2                    Na                    1

                      2                    Cl                     2

                      4                    H                      4

                      2                     O                     2

Now, the reaction is balanced

Answer:

NaCl +     2         H2 O →     2      NaOH +      Blank    Cl 2 + Blank                H 2

Answer:0.119g

Explanation:equation of rxn is

2Al+6HCl=2AlCl3+3H2

From ideal gas eqn

PV=nRT

n=PV/RT

P here is the partial pressure of H2 from the qtn.According to Dalton law of partial pressure, PT=PH2+PH20

PT=0.89atm given

PH20=25.2mmhg given=25.2/760atm,=0.033atm

PH2=PT-PH20

PH2=0.89-0.033=0.857atm

T=26+273=299K

R=0.082atmdm^-3mol^-1K^-1

V=190.6ml=190.6cm3=190.6/1000=0.1906dm3

n=PV/RT

n=0.857*0.1906/0.082*299

=0.00667moles of H2.

From the eqn of reaction,

2moles of Al reacts to gv 3moles of H2

xmoles of Al will give 0.00667moles of H2

xmoles=0.00667*2/3 (cross multiplying)=0.00444moles of Al

From the relationship, n=mass/MW

mass=MW*n

MW of Al=27g/mol

mass=0.0044moles*27g/moles

mass=0.119grams of Al.

The mass of aluminum that has reacted is 0.119 g.  The mass of the reactant can be calculated by finding its moles.

the mass of the reactant can be calculated by finding its moles in the reaction and putting the value in the mole formula.

The given reaction is:

[tex]\bold {2Al+6HCl\rightarrow 2AlCl_3+3H_2}[/tex]

First, calculate the moles of the Hydrogen from the ideal gas equation,

[tex]n=\dfrac {0.857\times 0.1906}{0.082\times 299}\\\\ n = \rm 0.00667 \ moles \ of \ H2.[/tex]

The molar ratio between Al and [tex]\bold {H_2 }[/tex] is 3:2.

Thus, moles of Aluminium is:

[tex]\text{Moles of Al} = 0.00667\times \dfrac 23 \\\\\text{Moles of Al} = 0.00444 \rm \ moles[/tex]

Thus the mass of Aluminium,

[tex]m ={\rm 0.0044 \ moles\times 27 \ g/moles}\\\\m = 0.119\rm \ g[/tex]

Therefore, the mass of aluminum that has reacted is 0.119 g.

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Answer:

12.9 m³ is the new volume

Explanation:

As the temperature keeps on constant, and the moles of the gas remains constant too, if we decrease the pressure, the volume will increase.  If the volume is decreased, pressure will be higher.

The relation is this: P₁ . V₁  = P₂  . V₂

1 atm . 0.93m³ = 0.072 atm . V₂

0.93m³ .atm / 0.072 atm = V₂

V₂ = 12.9 m³

In conclusion and as we said, pressure has highly decreased so volume has highly increased.

Answer:

33.3 kg of air

Explanation:

This is a problem of conversion unit.

Density is mass / volume

Therefore we have to calculate the volume in the room, to be multiply by density. That answer will be the mass of air.

Volume of the room → 9 ft . 11 ft . 10 ft = 990 ft³

Density is in g/L, therefore we have to convert the ft³ to dm³ (1 dm³ = 1L)

990 ft³ . 28.3 dm³ / 1ft³ = 28017 dm³ → 28017 L

This is the volume of the room, if we replace it in the density formula we can know the mass of air in g.

1.19 g/L = Mass of air / 28017 L

Mass of air = 28017 L .  1.19 g/L → 33340 g of air

Finally, let's convert the mass in g to kg → 33340 g . 1kg / 1000 g = 33.3 kg

Answer : A hypotonic solution has a higher concentration of water and lower concentration of solute than the cell placed in the solution.

Explanation :

Solution : It is made up of the combination of amount solute and solvent.

Isotonic solutions : It is defined as the solutions in which the concentration of solute inside the cell and outside the cell is same.

Hypotonic solutions : It is defined as the solutions in which the concentration of solute inside the cell is lower than outside the cell.

For example : Diluted sugar syrup

Hypertonic solutions : It is defined as the solutions in which the concentration of solute inside the cell is higher than outside the cell.

For example : Concentrated sugar syrup

Hence, a hypotonic solution has a higher concentration of water and lower concentration of solute than the cell placed in the solution.

The term for a solution that has a higher concentration of water and a lower concentration of solute than a cell is 'hypotonic'. In this scenario, water moves into the cell via osmosis.

A(n) hypotonic solution has a higher concentration of water and lower concentration of solute than the cell placed in the solution. In biology, we often talk about the relationship between cells and their surrounding environment in terms of tonicity. In a hypotonic environment, there is less solute (like salt or sugar) outside the cell compared to inside the cell. This causes water to move into the cell by osmosis, because water moves from areas of high concentration to areas of low concentration until equilibrium is reached.

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The molarity of the given ethanol solution can be computed using its given molality and the density of the solution. The molality tells us the moles of ethanol per kilogram of water, and the density allows us to convert this to moles per liter, generally yielding a larger molarity for the same solution. Thus, the molarity of ethanol in this solution would be 914 M.

To calculate the molarity of the ethanol solution, we first need to know that the definition of molality (m) is the moles of solute (in this case, ethanol) per kilogram of solvent (here, water). Given that the density of the solution, is 0.914 g/mL, we can convert this to kg/L for ease of calculation. So, 0.914 g/mL is equivalent to 914 kg/m^3.

Next, let's take 21.71 molal solution, implying there are 21.71 moles ethanol in 1 kilogram of water. Since the density of the solution is 0.914 g/mL (or 914 kg/m^3), there would be 914 moles of ethanol in 1 m^3 of solution (since 1 L = 1 m^3).

Thus, the molarity (M), which is defined as the moles of solute per liter of solution, of the ethanol in the solution would be 914 M.

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Answer: The molecular formula for the given organic compound is [tex]C_4H_8O_2[/tex]

Explanation:

We are given:

Percentage of C = 54.5 %

Percentage of H = 9.1 %

Percentage of O = 36.4 %

Let the mass of compound be 100 g. So, percentages given are taken as mass.

Mass of C = 54.5 g

Mass of H = 9.1 g

Mass of O = 36.4 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon =[tex]\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{54.5g}{12g/mole}=4.54moles[/tex]

Moles of Hydrogen = [tex]\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{9.1g}{1g/mole}=9.1moles[/tex]

Moles of Oxygen = [tex]\frac{\text{Given mass of oxygen}}{\text{Molar mass of oxygen}}=\frac{36.4g}{16g/mole}=2.28moles[/tex]

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 2.28 moles.

For Carbon = [tex]\frac{4.54}{2.28}=1.99\approx 2[/tex]

For Hydrogen  = [tex]\frac{9.1}{2.28}=3.99\approx 4[/tex]

For Oxygen  = [tex]\frac{2.28}{2.28}=1[/tex]

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H : O = 2 : 4 : 1

Hence, the empirical formula for the given compound is [tex]C_2H_{4}O_1=C_2H_4O[/tex]

Mass of empirical formula = [tex]C_2H_4O[/tex]  = 2(12) + 4(1) + 16 = 44 g/eq.

Now we have to determine the molar mass of compound by using ideal gas equation.

[tex]PV=nRT\\\\PV=\frac{w}{M}RT[/tex]

where,

P = pressure of gas = 1.00 atm

V = volume of gas = 120 mL = 0.120 L

T = temperature of gas = [tex]100^oC=273+100=373K[/tex]

w = mass of gas = 0.345 g

M = molar mass of gas = ?

R = gas constant = 0.0821 L.atm/mol.K

Now put all the given values in the above formula, we get:

[tex]PV=\frac{w}{M}RT[/tex]

[tex](1.00atm)\times (0.120L)=\frac{0.345g}{M}\times (0.0821L.atm/mol.K)\times (373K)[/tex]

[tex]M=88.04g/mol[/tex]

For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is :

[tex]n=\frac{\text{molecular mass}}{\text{empirical mass}}[/tex]

We are given:

Mass of molecular formula = 88.04 g/mol

Mass of empirical formula = 44 g/mol

Putting values in above equation, we get:

[tex]n=\frac{88.04g/mol}{44g/mol}=2[/tex]

Multiplying this valency by the subscript of every element of empirical formula, we get:

[tex]C_2H_4O=(C_2H_4O)_n=(C_2H_4O)_2=C_4H_8O_2[/tex]

Thus, the molecular formula for the given compound is [tex]C_4H_8O_2[/tex]

The empirical formula of the given compound is [tex]\bold {C_2H_4O}[/tex]. The empirical formula is the smallest whole-number ratio of the compound.

Assume the mass of the compound is 100 g. So, the percentages given are taken as mass.

Mass of C = 54.5 g  = 4.54 moles

Mass of H = 9.1 g  = 9.1 moles

Mass of O = 36.4 g = 2.28 moles

To formulate the empirical formula, Calculate the molar ratio by dividing moles by the smallest number,

For the mole ratio, we divide each value of the moles by the smallest number of moles, we get.

For Carbon = 2

For Hydrogen  =4

For Oxygen  = 1

Therefore, the empirical formula of the given compound is [tex]\bold {C_2H_4O}[/tex].

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Answer:A

Explanation:

The solar system consist of the sun, the planets, stars and other objects. The chemical composition of the Sun consist mainly of Hydrogen and helium.

The sun is the largest object in the Solar system, it comprises nearly all the matter in the Solar System, Also the largest planet after the Sun are Jupiter and Saturn are giant planets forming almost the remaining matter of the solar system.

Like the Sun, the mass of Jupiter and Saturn are composed of roughly 98% hydrogen and helium with 2% of all the other elements combined.

Answer:

The peptide will definitely migrated towards cathode (negative terminal)

Explanation:

The positively and negatively charged side chains of proteins cause them to behave like amino acids in an electrical field; that is, they migrate during electrophoresis at low pH values to the cathode (negative terminal) and at high pH values to the anode (positive terminal). The isoelectric point, the pH value at which the protein molecule does not migrate, is in the range of pH 5 to 7 for many proteins.

Answer:I beams can withstand greater Moment compared to other beams like rectangular beam when given the same stress.

Rectangular beams are better for casting concrete beams, and for making beams of high and low moment of inertia and its centriod is easy to understand.

Explanation: I beams are beams usually used in metal work and in making beams of high moments of inertia.

Rectangular beams are beams whose centroid ( the geometric center of a regular rectangular beam) are easily identifiable and they can be built to give high and low moment of inertia. This is one of the advantage of using rectangular beams.

The advantage of use of I beam over rectangular beam has been the wide spread and high moment of inertia.

In the construction industry, for the support to the buildings and the structure, beams of different shapes has been used. I beam are the steel or metal beams that have high functionality.

I beam has been made with the shape of rolled joist. They have been installed in the building because of their high moment of inertia.

I beam has been working with the spread of moment of inertia in the structure, that has been able to bend and withstand the pressure more than compared to the rectangular cross-section with concentrated inertia.

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Answer:

Lowers the actual yield

Explanation:

Answer : The precipitate will not be formed when these solutions are mixed.

Explanation :

The chemical equation for the reaction of calcium chloride and lithium sulfate follows:

[tex]CaCl_2(aq)+Li_2SO_4(aq)\rightarrow 2LiCl(aq)+CaSO_4(s)[/tex]

We are given:

Concentration of calcium ion = [tex]2.1\times 10^{-5}M[/tex]

Concentration of sulfate ion = [tex]4.75\times 10^{-5}M[/tex]

[tex]K_{sp}=2.4\times 10^{-5}[/tex]

The salt produced is calcium sulfate.

The equation follows:

[tex]CaSO_4(s)\rightleftharpoons Ca^{2+}(aq)+SO_4^{2-}(aq)[/tex]

The expression of [tex]Q_{sp}[/tex] (ionic product) for above equation follows:

[tex]Q_{sp}=[Ca^{2+}]\times [SO_4^{2-}][/tex]

Putting values of the concentrations in above expression, we get:

[tex]Q_{sp}=(2.1\times 10^{-5})\times (4.75\times 10^{-5})\\\\Q_{sp}=9.9\times 10^{-10}[/tex]

There are 3 conditions:

As, the [tex]K_{sp}>Q_{sp}[/tex]. The above reaction is product favored. This means that no salt or precipitate will be formed.

Hence, the precipitate will not be formed when these solutions are mixed.

Answer:

The answer to your question is Pd₂H₄

Explanation:

Data

mass of palladium = 42.56 g

mass of hydrogen = 0.8 g

Process

1.- Convert the grams of each substance to moles

                   106 g of Pd ----------------- 1 mol

                    42.56 g of Pd -------------  x

                      x = (42.56 x 1)/106

                      x = 0.402 moles

                      1 g of H --------------------- 1 mol

                     0.8 g of H ------------------ x

                     x = (0.8 x 1)/1

                     x = 0.8 moles

2.- Divide by the lowest number of moles

Palladium = 0.402/0.402 = 1

Hydrogen = 0.8/0.402 = 1.99 ≈ 2              

3.- Write the empirical formula

                                 PdH₂

4.- Calculate the mass of the empirical formula

PdH₂ = 106 + 2 = 108

5.- Divide the molar mass by the molar mass of the empirical formula

                     216.8/108 = 2

6.- Get the molecular formula

                 2(PdH₂) = Pd₂H₄

The molecular formula of the compound is determined to be Pd2H4, based on the calculated mole ratio of palladium to hydrogen and considering the given molar mass of the compound.

To find the molecular formula of a compound, we first determine the mole ratio between palladium and hydrogen. The molar mass of palladium (Pd) is 106.42 g/mol and the molar mass of hydrogen (H) is 1.008 g/mol. Therefore, 42.56 g of Pd is equivalent to 42.56/106.42 = 0.4 mol, and 0.80 g of H is equivalent to 0.80/1.008 = 0.793 mol. This simplifies to a ratio of 1:2, indicating the empirical formula of the compound is PdH2.

Next, we compare the molar mass of the empirical formula with the molar mass given for the compound. The molar mass of PdH2 is 1.008*2 + 106.42 = 108.436 g/mol. The molar mass given for the compound is 216.8 g/mol. Therefore, the molecular formula is twice the empirical formula, result to be Pd2H4.

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Answer:

Lithium and Sodium

Explanation:

Losing and electron in natural setting is characterizes of elements in group one. These are elements known as the alkaline earth metals. They are the most electropositive elements on the periodic table.

These elements ionize by losing an electron yin their outermost shell to attain the configuration of the nearest noble gas. These elements are usually found in combined and rarely seen in uncombined state principally due to their very reactive nature.

Sodium naturally would ionize by losing one electron. Other elements capable of this even at a better rate because they are more electropositive are potassium and lithium. Both are also group one alkaline metals

Answer:

10

Explanation:

Binary search's runtime is proportional to log (base two) of the number of list elements.

Answer:

18.00 mL is the volume in mL of 1 mol of water

Explanation:

Water density = water mass / water volume

1 g/mL = water mass / water volume

1 mol of water weighs 18 g. Therefore, 1 g/mL = 18 g / water volume

water volume = 18 mL

Answer:

18.0

Explanation:

Enjoy. Jesus loves YOU!

Answer:

True is the correct answer to the above question.

Explanation:

Answer:

"True" is the correct answer to this question.

Explanation:

The program to the given question as follows:

Program:

public class data //defining class

{

  public static void main (String [] aw)//defining the main method

  {

String x="OH"; //defining string variable x and assign value

System.out.println("assign value: "+x); //print value

x = new String("OH"); //defining instance variable and assign value

System.out.println("assign value by creating instance: "+x); //print value

  }

}

Output:

assign value: OH

assign value by creating instance: OH

Explanation of the program:

In the above java program, a class data is defined, inside the class the main method is declared, In this main method a string variable "x" is defined that holds a value "OH", then we the print function to print this variable value.

In the next line, An instance of variable x is created, which holds a value "OH" in its parameter. In this question, both are correct because both hold the same value.

Answer:

w/v% = gm per 100 ml

75gm X gm 7500

------- = ------ == --------

1500ml 100ml 1500X

X=5%

Answer:

Law of definite proportion

Explanation:

As per law of definite proportion, ratio of elements present in a compound is always fixed irrespective of the  source, amount and method of preparation.

In the given case, the hydrogen and oxygen react with each other to form a compound. The ratio of oxygen and hydrogen is fixed which is 8 : 1 and this ratio does not change upon changing amount of oxygen and hydrogen.

So, the this experiment support the law of definite proportion.

Therefore, the correct option is option 4

Answer:

Option d: C₈H₉NO₂ = acetaminophen, analgesic

Explanation:

% composition of compound is:

63.57 g of C

6 g of H

9.267 g of N

21.17 g of O

First of all we divide each by the molar mass of the element

63.57 g / 12 gmol = 5.29 mol of C

6 g of H / 1 g/mol = 6 mol H

9.267 g of N / 14 g/mol =  0.662 mol of N

21.17 g of O / 16 g/mol = 1.32 mol of O

We divide each by the lowest value, in this case 0.662

5.29 / 0.662 = 8

6 / 0.662 = 9

0.662 / 0.662 = 1

1.32 / 0.662 = 2

Molecular formula of the compound is C₈H₉NO₂

Answer:

Yes, this is true. The reason is that the flower transpires and sucks the water in and distributes it as much as it can. You can also flip it upside down and hang it with petals down , allowing the liquid to enter the flower and then retaining color for longer periods of time and having more color.

Explanation:

Answer:

The answer to your question is letter B. 2.5 atm

Explanation:

Data

P1 = ?                  P2 = 2 atm

T1 = 45°C = 318°K           T2 = 35°C = 308°K

V1 = 28 L             V2 = 34 L

Formula

Combined gas law

   P1V1/T1 = P2V2/T2

solve for P1

   [tex]P1 = \frac{T1P2V2}{V1T2}[/tex]

Substitution

  P1 = (318 x 2 x 34) / (28 x 308)

Simplification

  P1 = 21624 / 8624

Result

  P1 = 2.5 atm

A reducing agent does get oxidized as it reacts in a process known as a redox reaction. During this reaction, the reducing agent loses electrons, effectively donating them to another substance. Disproportion reactions are also possible, where the same substance gets oxidized and reduced.

Yes, the statement is true: A reducing agent gets oxidized as it reacts. In redox reactions, the substance that is oxidized loses electrons and is therefore referred to as the reducing agent. For example, in the reaction, 'Al(s) + NiO(s) --> Al2O3(s) + Ni(s)', aluminum (Al) is the reducing agent as it gets oxidized from 0 to +3 oxidation state while reducing nickel oxide (NiO).

Redox reactions involve the transferring of electrons from one atom (which gets oxidized) to another (which gets reduced). In the process, the reducing agent is oxidized because it essentially donates its own electron to the other substance.

There are also cases of disproportion reactions where the same substance gets oxidized and reduced. These reactions are very interesting in the context of oxidation-reduction chemistry.

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Answer:

option c, 0.1 M [tex]AlCl_3[/tex]

Explanation:

Addition of non-volatile solute to a solvent decreases its vapour pressure which results in decrease in melting point.

Decrease in melting point is known as depression in freezing point. the depression in freezing point is related with molality and no. of ions as follows:

[tex]\Delta T_f = imK_f[/tex]

Where, i is von't Hoff factor, m is molatilty and ΔTf  is depression in freezing point.

As, in the given case concentration of all the solution is same, therefore, depression in freezing point will depend upon the no. of ions produced by the ionization of the salts in the aqueous solution.

In case of NaCl, the no. of ions produced will be 2.

Therefore, value of i will be 2

In case of [tex]MgCl_2[/tex], the no. of ions produced will be 3.

Therefore, value of i will be 3

In case of [tex]AlCl_3[/tex], the no. of ions produced will be 4.

Therefore, value of i will be 4.

More, the value of van't Hoff factor, more will be depression in freezing point.

Therefore, assuming the given solution to be aqueous, the solution expected to have lowest freezing point is 0.1 M  [tex]AlCl_3[/tex].

The correct option is b. 0.1 M MgCl2 would be expected to have the lowest freezing point.

To understand why 0.1 M MgCl2 has the lowest freezing point, we need to consider the colligative properties of solutions, specifically the freezing point depression. The freezing point depression is directly proportional to the number of particles (ions or molecules) in the solution. When a solute is dissolved in a solvent, it dissociates into ions, and the more ions it dissociates into, the greater the freezing point depression.

Let's analyze each of the given solutions:

a. 0.1 M NaCl: Sodium chloride (NaCl) dissociates into two ions in solution, Na+ and Cl-. Therefore, the total number of particles in solution is 2 times the concentration of NaCl, which is 0.2 moles of particles per liter.

b. 0.1 M MgCl2: Magnesium chloride (MgCl2) dissociates into three ions in solution, Mg2+ and 2Cl-. Therefore, the total number of particles in solution is 3 times the concentration of MgCl2, which is 0.3 moles of particles per liter.

c. 0.1 M AlCl3: Aluminum chloride (AlCl3) can dissociate into four ions in solution, Al3+ and 3Cl-. However, AlCl3 is not fully dissociated in aqueous solution due to its Lewis acid behavior and the formation of complex ions such as AlCl4-. Assuming complete dissociation for simplicity, which is not the case in reality, the total number of particles in solution would be 4 times the concentration of AlCl3, which is 0.4 moles of particles per liter.

Since MgCl2 dissociates into the most number of ions compared to NaCl and AlCl3 (assuming complete dissociation for AlCl3), it will have the greatest effect on freezing point depression. Therefore, 0.1 M MgCl2 is expected to have the lowest freezing point among the given options.

It is important to note that in reality, the actual freezing point depression of AlCl3 would be less than calculated here due to its incomplete dissociation and complex ion formation. This further supports the conclusion that MgCl2 would have the lowest freezing point, as AlCl3 would not reach the expected freezing point depression based on complete dissociation.