What are some non-examples of the Van der Waals force?

Answer:

b labeling all chemical immediately

Al₂(CO3)3 has the highest melting point. Aluminum carbonate has melting point of 58 degree Celsius.

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The solubility of MgCO₃ in a solution that contains 0.055 M Mg²⁺ ions is 6.36 * 10⁻⁷.

The solubility of a solution is the amount of solute present in a given volume of solvent.

The solubility of MgCO₃ in a solution that contains 0.055 M Mg²⁺ ions is calculated from the dissociation equation for the reaction given below:

The solubility product constant, Ksp =  [Mg²⁺] * [CO₃²⁻]

At equilibrium, [Mg²⁺] = 0.055 + x

[CO₃²⁻] = x

Assuming x is <<< 0.055, hence 0.055 + x = 0.055

Ksp = 0.055 * x

x = Ksp / 0.055

x = 3.5 × 10⁻⁸ / 0.055

x = 6.36 * 10⁻⁷

Hence, the solubility of MgCO₃ = 6.36 * 10⁻⁷

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The molecular formula for the compound in the task given above is 2,2,3-trimethylbutane.

The correct answer choice is option b.

The molecular formula of a compound is the name of the compound derived from its structural formula. From the task given above, the parent chain is butane. There are three different substituents groups; 2 different methyl group on carbon 2 and another methyl substituent at carbon 3.

The image to further illustrate the solution to the above problem is attached.

That being said, organic compounds are those compounds which contains carbon and hydrogen.

In conclusion, from the detailed explanation above, it can be deduced that the name of the compound above is 2,2,3-trimethylbutane

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1) The transition that produces the least energy is n = 4 → n = 3

2) The transition that produces a photon with the highest frequency is n = 6 → n = 3

3) The  transition that produces a photon with the shortest wavelength n = 4 → n = 3

We know from the Bohr model that an electron that is found in the hydrogen atom can be moved from a lower to a higher energy level and that would happen when the electron is able to absorb energy in the form of visible light.

Looking at the transitions as we have it here, we can see that the photon that would photons produce the least energy would be two levels that are closest together.

Also, the photon that would have the highest frequency is the photon that is involved in the transition that has the furthest energy apart from each other.

The transition that produces  a photon with the shortest wavelength must also be farthest  apart in energy.

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The two isotopes' relative abundances are: 121 antimony = 57.2% and

123 antimony = 42.8%.

The average mass of all antimony isotopes is 121.76 amu.

Taking into account your data,

(the sum of both abundances is 100%), and

120.904x+122.904y=121.76

Now, some high school algebra will assist us in understanding the solution.

= 120.904x+12.2904x=121.76x=0.572, and thus

x+ y= 1

∴y≈ 0.42

Results show that 121 Sb has a relative abundance of about 57.2% and 123 Sb has a relative abundance of about 42.8% when these decimals are converted into percentages.

There are 2 naturally occurring isotopes of antimony. Antimony-121 has a mass of 120.904 amu, and antimony-123 has a mass of 122.904 amu.

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Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

In the displacement reaction , one atom is displaced by the the another atom according to their reactive strength . the highly reactive atom displace the low reactive atom called as displacement reaction.

The reactions are given as :

FeSO₄  +  Zn  ---->  ZnSO₄   +   Fe

Fe(NO₃)₂   +  Zn ----->   Zn(NO₃)₂   +  Fe

Here the zinc is more reactive than the iron . so, Zinc displace the iron in both the cases. Zinc displace the iron in both the cases. The reaction is called as displacement reaction.

Thus, Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

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The maximum number of dots an electron dot diagram can have is 8.

The maximum number of dots drawn on the side of a chemical symbol in an electron dot diagram is 2.

The electron dot diagrams is otherwise known as Lewis electron dot diagrams, Lewis structure, or simple Lewis diagram. It is a diagrammatic representation of the valence electrons of atoms using dots to represent electrons around the symbols of atoms.

The valence electron of an atom is the number of electrons present in the outermost shell of the atom. According to the rules, the first shell of an atom can take a maximum of 2 electrons while the remaining shells can take a maximum of 8 electrons each.

Atoms with 8 electrons in their outermost shells are said to be in an octet state.

The number of dots an atom will have around it will, therefore, depend on the number of valence electrons it has.  As a rule of thumb, each side of an atom can take a maximum of 2 electrons. Thus, an atom with 8 valence electrons will have 2 dots each on its 4 sides.

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Answer:

the first is 8 an the second one is 2

Explanation:

What will happen to the solute molecules on the left side of the container would depend on the kind of solution present on the right side.

What will happen to the solutes in the container can be explained using osmosis.

Osmosis refers to the movement of water molecules from the region of high water potential or low solute concentration to the region of low water potential or high solute concentration through a selectively permeable membrane.

Now, let us assume that the solution on the right side of the container has a lower solute concentration, which means that water molecules would move from the right side to the left side through the semi-permeable membrane. The solutes in the left side of the container would become diluted.

If it were to be the other way round, that is, the solution on the right side has more solutes than the one on the left side. Water molecules will move from the left side to the right side. Thus, the solution on the left side will become more concentrated as a result of water loss.

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The partial pressure of nitrogen gas in 2L sample of gas 1 and gas 2 are equal.

The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's law of partial pressures, a gas law.

P'=X° ×Pt ( P' = partial pressure , Xi = mole fraction , Pt= Total pressure )

Gas 1  ( ∵1 mole of gas = 22.4L)

Nitrogen moles = 80% × 2L / 22.4L

=8/5x22.4L

Oxygen moles = 20% ×2L /22.4L

2/5 × 22.4l

Mole fraction of nitrogen =  (8/5 ×22.4L) ÷ (8/5 ×22.4L+ 2/5x22.4L)

=4/5

Partial pressure of nitrogen at 1 atm = 4/5 * 1

=4/5

Similarly Gas 2

Nitrogen moles = 80% × 2L / 22.4L

=16/10 × 22.4L

Oxygen moles = 15%  × 2L /22.4L

3/10 × 22.4l

Carbon dioxide moles = 5% × 2L /22.4L

1/10 × 22.4L

Mole fraction of nitrogen =  (16/10 × 22.4L) ÷ (16/10 ×22.4L+ 3/10x22.4l + 1/10X22.4L) = 4/5

Partial pressure of nitrogen at 1 atm = 4/5 * 1

=4/5

Hence, partial pressure of nitrogen in gas 1 and gas 2 are equal.

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The balanced net ionic equation for the reaction between potassium sulfide and lead(II) nitrate is Pb²⁺(aq) + S²⁻(aq) → PbS(s)

From the question, we are to write the balanced net ionic equation for the given chemical reaction.

The given chemical reaction is

K₂S(aq) + Pb(NO₃)₂(aq) →

The between potassium sulfide and lead(II) nitrate will produce potassium nitrate and lead sulfide.

That is,

K₂S(aq) + Pb(NO₃)₂(aq) → KNO₃(aq) + PbS(s)

Now, balance the equation

K₂S(aq) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + PbS(s)

Write the complete ionic equation

2K⁺(aq) + S²⁻(aq) + Pb²⁺(aq) + 2NO₃⁻(aq)  → 2K⁺(aq) + 2NO₃⁻(aq) + PbS(s)

Cancel out the spectator ions

S²⁻(aq) + Pb²⁺(aq)   → + PbS(s)

Hence, the balanced net ionic equation is

Pb²⁺(aq) + S²⁻(aq) → PbS(s)

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In both plants and animals, the process of cellular respiration may be broken down into the following steps: Oxygen + carbon dioxide.

When plant cells undergo cellular respiration, oxygen is taken in through the plant's leaves from the surrounding atmosphere, and carbon dioxide is exhaled back into the atmosphere as a byproduct of the process. In contrast, when animal cells undergo cellular respiration, oxygen is taken in through the lungs, and carbon dioxide is exhaled through the lungs.

Therefore, a quick review, throughout the process of cellular respiration, plants and animals trade oxygen and carbon dioxide with one another.

Therefore, we may draw the following conclusion: Oxygen + carbon dioxide is a shorthand for the process of cellular respiration in plants and animals.

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We obtain the mass percent of the element T as 96.5%.

We know that the mass percent actually has to do with the mass of the object that we could have in a compound expressed as a percentage. Note that we are told that most of the new elements that were discovered do exist as oxides this implies that they are binary compounds of the element that is involved and oxygen.

Now we have to look at the section of the table that have been given in the question so as to be able to obtain the the mass percent of the element as we have it. We can see as it has been written in the table that the atomic mass of the element T is found to be 362.31.

We would now have;

Molar mass of the compound = 6(362.31) + 5(16)

= 2173.86 + 80

= 2253.86

Mass percent composition of element T =  6(362.31)/2253.86 * 100/1

= 96.5%

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A) The work you do on the pumpkin is 31.36 J as you lift it from the ground.

B) The work is zero as you carry it from the field.

Work can be defined as the energy spent when applying a force to move an object through a certain displacement.

The work by a force to move an object through a displacement (d) can be written as:

W = Fdcosθ

Where θ is angle between force and displacement.

(a) The mass, the displacement of the pumpkin from the ground, and the angle are:

m = 3.2 kg

d = 1.4 m

θ = 0∘

Here, the force exerted during lifting the pumpkin is equal to the weight of the pumpkin:

F = mg = (3.2)(9.8) = 31.36 N

Thus, the work done when lifting the pumpkin is

W = F d cosθ = (31.36 N)(1.4m)cos(0∘) = 44 J

(b) When carrying the pumpkin, the force exerted will be upward while the displacement of the pumpkin will always be directed forward. Therefore, they are perpendicular (i.e. θ = 90∘) to each other which is the reason why the work is zero.

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0.506 moles  of  aluminum are required to remove 0.253 mol of silver sulfide from a silver bowl.

3Ag2S(s) + 2Al(s) --> 6Ag(s) + Al2S3(s)

2 moles of Al required to make 1 mole  Al2S3

1 moles Al2S3= 2 moles Al

0.253 moles Al2S3 = 0.506 moles  Al

The mole idea facilitates the measurement of a material's amount. When interacting with particles at the atomic (or molecular) level, it is acknowledged that even a single gram of a pure element has a significant number of atoms. The mole theory is widely used in this context. The most often used unit of measurement is the "mole," which is a count of many particles.

The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". One of the most fundamental entities that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

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Answer:

B.) 10.9 g

Explanation:

To find the mass of Mg(NO₃)₂, you need to (1) convert the volume from mL to L, then (2) calculate the amount of moles (using the molarity equation), and then (3) convert moles to grams (using the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.

(Step 1)

1,000 mL = 1 L

 183 mL                1 L
--------------  x  -----------------  =  0.183 L
                        1,000 mL

(Step 2)

Molarity = moles / volume (L)                   <----- Molarity equation

0.400 M = moles / 0.183 L                        <----- Insert variables

0.0732 = moles                                        <----- Multiply both sides by 0.183

(Step 3)

Atomic Mass (Mg): 24.305 g/mol

Atomic Mass (N): 14.007 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.999 g/mol)

Molar Mass (Mg(NO₃)₂): 148.313 g/mol

 0.0732 moles Mg(NO₃)₂             148.313 g
---------------------------------------  x  ---------------------  =  10.9 g Mg(NO₃)₂
                                                         1 mole

The reaction the reversible reaction is given as :

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

The photosynthesis is to convert carbon dioxide and water and light in into glucose and oxygen.

photosynthesis :

6CO₂    +    6H₂O   + Heat    ------>     C₆H₁₂O₆    +    6O₂

In cellular respiration organism release energy stored in the chemical bond of glucose.

C₆H₁₂O₆    +    6O₂   ----->  6CO₂    +    6H₂O   + Heat    

The reversible reaction can be as follows :

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

                       reactants                      products

C                             6                                6

H                             12                                12

O                             18                                 18

The number of atoms present in reactant side is equal to the number of atom in product side. the equation is balanced.

6 moles of carbon dioxide produce 1 mole of oxygen

6 mole of water produce 1 mole of carbon dioxide

Thus, the reversible reaction given as:

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

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Answer:

Strength:

Weakness:

Answer:20 mi/s

Explanation:

The number of common amino acids that are formed and used by living organisms is twenty (20), and nine are essential for living.

Amino acids are the building blocks of proteins that are linked by peptide bonds to form biomolecules. Proteins may be composed of 20 different types of amino acids, which include 9 essential amino acids that the human cannot synthesize and must be consumed from the diet.

Amino acids include, for example, leucine, isoleucine, tryptophan, tyrosine, etc. All these molecules contain an amino group and also a carboxylic group that gives them the name of amino acids.

Therefore, with this data, we can see that amino acids are composed of an amine group and a carboxylic group and they are 20 of which nine (9) are essential because the human body cannot synthesize them and must be obtained from the foods.

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The volume (in L) of O₂ gas, measured at 792 mmHg and 23 °C, that is required to completely react with 52.6 g of Al is 34.14 L

We'll begin by obtaining the mole of O₂ that reacted. This can be obtained as follow:

4Al(s) + 3O₂(g) → 2Al₂O₃(s)

From the balanced equation above,

4 moles of Al reacted with 3 moles of O₂

Therefore,

1.948 moles of Al will react with = (1.948 × 3) / 4 = 1.461 mole

Finally, we shall determine the volume of the O₂ required. Details below

PV = nRT

1.042 × V = 1.461 × 0.0821 × 296

Divide both sides by 1.04

V = (1.461 × 0.0821 × 296) / 1.04

V = 34.14 L

Thus, the volume required is 34.14 L

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The balanced chemical equation is [tex]\rm 2SO_2 + O_2 \rightarrow 2SO_3[/tex].

Balanced chemical equation is defined as a formula where both the reactants and the products have the same amount of atoms of each kind. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.

The balanced chemical equation are

[tex]\rm 4NH_3 + 3O_2 \rightarrow 2N_2 + 6H_2O[/tex]

[tex]\rm C_4H_1_0+ 5O_2 \rightarrow 4CO_2 + 5H_2O[/tex]

[tex]\rm 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2[/tex]

[tex]\rm 8Al + 3Fe_3O_4 \rightarrow 4Al_2O_3 + 9Fe[/tex]

[tex]\rm Sr + 2H_2O \rightarrow Sr(OH)_2 + H_2[/tex]

Thus,  balancing the chemical equation is very important as per the law.

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Yes , the buoyant force from the atmosphere is greater on her car than your balloon .

So, She is correct.

Since, the density of helium is less than air, the buoyant force exerted by air is less than the weight of the balloon filled with helium, causing the balloon to float in the air and rise.

What do you mean by buoyant force?

The term light power alludes to the vertical coordinated force that a liquid applies on an item that is to some degree or totally drenched in the liquid. The light power emerges from contrasts in hydrostatic strain - the tension applied by a static liquid.

What is the buoyant force on a helium balloon in air?

Helium has 0.0114 pounds per cubic foot. For a one cubic foot helium filled balloon , gravity pulls the down on the helium with a force of 0.0114 pounds while the air pushes up with a force equal to the weight of the air of the helium displaced, or 0.0807 pounds.

        Hence, the buoyant force from the atmosphere is greater on the car than the balloon.

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No, there are no  concerns if you wait an hour or two after you calibrate the spectrophotometer to obtain the absorbance of your solutions and unknown as it will not change because the light source is not aging faster but if your light source age faster, then there are concerns.

In the case above, light source is the issue because it is deteriorating quickly. If you're lucky, the lamp's usable life will be at least four digits of hours. On the other hand, allowing the lamp to stabilize itself speeds up aging. Given the limited lifespan, it is advisable to calibrate frequently such as daily.

The calibration rate is determined by the goal of the measurement. For most photometric tests, parameter variations in the interval between calibration and measurement will be negligibly large enough to significantly increase the overall measurement error. (Take note that the amount of error in typical analytical measurements, including sample preparation, is often at or above 10%.)

The routine calibration then appears to be unnecessary because the effort you put out will be pointless. In any instance, the experimental analysis of the impact of daily or biweekly calibration (often conducted inside validation studies) will offer the response.

It may even make sense to calibrate the instrument every 5 or 10 operational hours if you are using it continuously for a long length of time. If the manufacturer changes the cuvette materials (they will also change the Lot No.), you should recalibrate depending on the light source's lifespan and the materials you used to place your samples there. however, you should be cautious of dust because it might significantly alter the outcomes if the lenses have dirt.

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The specific heat of the metal is 1.1106 J/g°C

Specific heat is the quantity of heat required to raise the temperature of one gram of a substance by one celsius degree

Here given data is

Mass of unknown metal = 23.8g

Temprature = 100°C

Mass of water = 50.0cm³ = 50 g

Temprature of water =  24.0°C

Final temprature of the system = 32.5°C

We have to find specific heat = ?

So first we determine the heat gain by water

Specific heat of water is 4.18 J/g°C

Q = mcΔT

Q =  50 g×8.5°C×4.18 J/g°C

Q = 1776.5 Joules

Then we determine the total heat lost by the unknown metal

Taking the specific heat f the metal to be x

Heat = 23.8g×67.5°C×x

1776.5 Joules = 23.8g×67.5°C×x

1776.5 Joules = 1606.5 J

x =  1606.5 J/1776.5 Joule

x = 1.1106 J/g°C

Specific heat of the metal is  1.1106 J/g°C

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Taking into account the reaction stoichiometry, 163.67 grams of C  is needed to reduce Al₂O₃ to produce 491 grams of pure aluminum.

In first place, the balanced reaction is:

2 Al₂O₃ + 3 C → 4 Al + 3 CO₂

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:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if 108 grams of Al are produced by 36 grams of C, 491 grams of Al are produced by how much mass of C?

mass of C= (491 grams of Al× 36 grams of C)÷ 108 grams of Al

mass of C= 163.67 grams

Finally, 163.67 grams of C is required.

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Answer: -210.08 J

Explanation:

Use the formula q = (m)(c)(ΔT)

q = (1.25)(2.02)(102.1-185.3)

q = -210.08 J

This is exothermic! Heat is lost.

Explanation:

H2So4=sulphuric acid , strong acid