In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using? chromatography distillation filtration fragmentation condensation

The Lewis structure for MgI2 shows 3 lone pairs of electrons on each I atom and no lone pairs on the Mg atom.

The Lewis structure for MgI2 can be drawn by following a few steps:

The final Lewis structure for MgI2 will have 3 lone pairs of electrons on each I atom and no lone pairs on the Mg atom.

https://brainly.com/question/9908915

#SPJ6

Final answer:

Rhodopsin, found in the retina's rod cells, is essential for vision by changing shape when exposed to light, initiating signal transduction to the brain. Rods are crucial for dim light vision, while cones handle color vision. The absorption of light by rhodopsin ultimately allows humans to see.

Explanation:

The human eye detects light through a sophisticated process involving rhodopsin, a special photopigment found in the retina. This pigment is a combination of a protein called opsin and the molecule 11-cis-retinal. When light reaches the photoreceptors, rods and cones, within the retina, it causes a conformational change in rhodopsin. Specifically, when light hits the rods, it causes the 11-cis retinal to change to all-trans retinal, splitting rhodopsin into opsin and all-trans retinal. This change sends a signal to the brain, allowing us to perceive the presence of light and, ultimately, see.

Rod cells are more sensitive and are crucial for vision in dim light, while cone cells provide detailed color vision under brighter light conditions. Rods contain rhodopsin with a maximum absorption around 500 nm, mainly in the blue-green region of the visible spectrum. Cones contain three types of photopigments, called opsins, each sensitive to different wavelengths of light corresponding to the primary colors red, green, and blue. The process of light absorption by rhodopsin and signal transduction to the brain is fundamental for human vision.

Explanation:

It is known that density of water at [tex]20^{o}C[/tex] is 998,29 [tex]kg/m^{3}[/tex] or 0.998 g/ml (as 1 [tex]kg/m^{3}[/tex] = 0.001 g/ml).

Therefore, calculate mass of water as follows.

        Mass of water = Final mass - initial mass

                                = 20.2144 g - 10.2634 g

                                = 9.951 g

As we known that density is the amount of mass present in a unit volume.                            

Mathematically,       Density = [tex]\frac{mass}{volume}[/tex]

Therefore, putting the given values into the above formula we will calculate the volume as follows.

                         Density = [tex]\frac{mass}{volume}[/tex]

                         0.998 g/ml = [tex]\frac{9.951 g}{Volume}[/tex]

                        Volume = 9.97 ml

Thus, we can conclude that volume of the flask at [tex]20^{o}C[/tex] is 9.97 ml.

The true volume of the flask at 20°C is 8.30145 mL.

The true volume of the flask can be calculated using the difference in mass before and after adding water.

Therefore, the true volume of the flask at 20°C is 8.30145 mL.

Correct question is: An empty 10 ml volumetric flask weighs 10.2634 g. when filled to the mark with distilled water and weighed again in the air at 20°C , the mass is 20.2144 g. What is the true volume of the flask at 20°C ?

O2 experiences London dispersion forces, NBr3 experiences dipole-dipole interaction, CH4 experiences London dispersion forces, and HF experiences hydrogen bonding due to the presence of a hydrogen atom bonded to a highly electronegative atom.

The given molecules show different types of intermolecular forces. Oxygen gas (O2) is a non-polar molecule and it interacts through London dispersion forces, the weakest form of forces. Nitrogen tribromide (NBr3) has polar bonds, so this compound's main intermolecular force would be dipole-dipole interaction. Methane (CH4) is non-polar, so the intermolecular forces are due to London dispersion forces. Hydrogen Fluoride (HF) experiences hydrogen bonding because it contains a hydrogen atom bonded to a more electronegative atom, fluorine.

https://brainly.com/question/34620632

#SPJ11

According to Charles's law, the final volume of a gas that is cooled from 27 °c to 11 °c at constant pressure, and initially in a 2.6 L flask, is 2.46 L.

This question pertains to Charles's law, which states that the volume of a gas is directly proportional to its temperature if kept at a constant pressure. In this case, the initial temperature T₁ is 27°C (which converts to 300 K) and the final temperature T₂ is 11°C (or 284 K). The initial volume V₁ is 2.6 L. Remembering to convert degrees Celsius to Kelvin (by adding 273), we can solve for V₂, the unknown final volume, by setting up the equation V₁/T₁ = V₂/T₂.

Solving for V₂ yields V₂ = V₁ × (T₂/T₁) = 2.6 L × (284K/300K) = 2.46 L. So, if a gas originally at 27 °c and 1.00 atm pressure in a 2.6 L flask is cooled at constant pressure until the temperature is 11 °c, the new volume of the gas is 2.46 L.

https://brainly.com/question/16927784

#SPJ3

Answer:

Aluminium.

Explanation:

Hello,

In this case, the most appropriated metal turns out being the Aluminum since  it is higher in the activity series than nickel. Don't forget that activity series is an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacement reactions and ore extraction.

Best regards.

The ability to attract an electron for bonding is called Electronegativity. Hence, option C is correct.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

Electronegativity is a measure of an atom's ability to attract shared electrons to itself.

The more strongly an atom attracts the electrons in its bonds, the larger its electronegativity.

Hence, option C is correct.

Learn more about atom here:

brainly.com/question/1566330

#SPJ5

Chlorine (Cl2) exhibits dispersion forces as its strongest intermolecular force. HBr exhibits dipole-dipole forces, and Co and NaCl show stronger forms of bonding (metallic and ionic, respectively). Larger, heavier atoms or molecules generally display stronger dispersion forces due to their greater number of electrons.

The molecule or compound that exhibits dispersion forces as its strongest intermolecular force among Co, HBr, Cl2, and NaCl is Cl2. Dispersion forces are the only type of intermolecular force that occurs between noble gas atoms and nonpolar molecules such as Cl2. They arise as a result of fluctuations in electron density in an atom or molecule, that create temporary regions of positive and negative charge. These forces can attract nearby oppositely charged regions in neighboring molecules.

In the provided list, Hydrogen Bromide (HBr) exhibits dipole-dipole forces which are stronger than dispersion forces because it's a polar molecule. Cobalt (Co) is a metal and exhibits metallic bonding which is stronger than the dispersion forces. Sodium chloride (NaCl) forms an ionic compound and hence shows ionic bonding, which is much stronger than the dispersion forces.

Molecules with larger and heavier atoms, like chlorine (Cl2) , generally exhibit stronger dispersion forces compared to the smaller and lighter atoms, because of the presence of more electrons that can create temporary poles. At room temperature, Cl2 is a gas, but its dispersion forces allow it to condense into a liquid or solid under the right conditions.

https://brainly.com/question/31306859

#SPJ3

the molecular egometry around each carbon atom in a staurated hydro carbon is tetrahydral

To calculate the concentration of Zn2+ at the cathode of a concentration cell, you apply the Nernst equation and solve for the unknown concentration using the given cell voltage, known ion concentration at the anode, and the idea that E^0 is 0 for concentration cells.

The student asked to calculate the concentration of the Zn2+ (aq) ion at the cathode of a zinc concentration cell at 25 °C, given that the cell voltage is 16.0 mV. To find this, we use the Nernst equation, which relates cell potential to ion concentration:

E = E^0 - (RT/nF)lnQ

With the given cell reaction Zn(s) → Zn2+ (aq) + 2e-, where the anode process is oxidation, and the cathode is where reduction occurs, we set up the reaction quotient Q as:

Q = [Zn2+]_{cathode} / [Zn2+]_{anode}

Since E^0 for a concentration cell is 0 (because both electrodes are of the same material), and the given [Zn2+]_{anode} is 0.100 M, we only need to find [Zn2+]_{cathode}. Rearranging and solving for [Zn2+]_{cathode}, we get:

16.0 mV = - (0.0592 V/2) * log(Q)

Q = 10^( -(16.0 mV) / (0.0592 V/2) )

[Zn2+]_{cathode} = Q * [Zn2+]_{anode} is then calculated to find the unknown concentration.

https://brainly.com/question/31667562

#SPJ6

Answer: Option (a) is the correct answer.

Explanation:

Rate of reaction is defined as the rate at which a chemical reaction occurs. That is, it tells how rapidly or slowly the products are formed.

Mathematically,         Rate = [tex]\frac{-\Delta [reactants]}{\Delta t}[/tex]

It also tells the number of successful collisions taking place.

Thus, we can conclude that the speed at which products form is measured by the reaction rate.

0.499 mg will remain after 13.0 days. So, the correct answer is (E).

The time which is required for a quantity to reduce to half of its initial value is defined as Half life. This is commonly used in nuclear physics to for the description of unstable atoms undergo radioactive decay or how much time stable atoms survive.

Formula for Half Life,

t1/2 = ln 2 / λ

where,

t1/2 is half-life

λ is radioactive decay constant

For given information,

here, t1/2 = 8.04 days

so, 8.04 days    = ln 2 / λ                        

λ  = ln 2 / 8.04 days

As per Radioactive decay law,

[tex]N_t = N_o[/tex]e∧(-λt)

where,

[tex]N_t[/tex] is amount of compound at t time,

[tex]N_o[/tex] is amount of compound at  t = 0 time

t is time taken to decay

λ is radioactive decay constant.

[tex]N_o[/tex] = 1.53 mg

λ  = ln 2 / 8.04 days = 0.693 / 8.04 days

t  = 13.0 days

By substituting,

[tex]N_t[/tex]= 1.53 mg e∧{(-0.693/8.04 days) x 13.0 days)}

[tex]N_t[/tex] = 0.4989 mg = 0.0.499 mg

Hence, mass of remaining sample after 13.0 days = 0.499 mg

Thus, 0.499 mg will remain after 13.0 days. So, the correct answer is (E).

Learn more about Half life, here:

https://brainly.com/question/24710827

#SPJ2

Chemical formula of compound when bond is formed between oxygen and hydrogen is OH₂.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

Learn more about chemical formula ,here:

https://brainly.com/question/11995171

#SPJ2

Final answer:

The conversion of pyruvate to acetyl CoA is represented by the equation: C3H3O3- + CoA-SH + NAD+ → CH3-C-S-CoA + CO2 + NADH + H+. This step catalyzed by the pyruvate dehydrogenase complex involves oxidative decarboxylation and connects glycolysis to the Krebs cycle.

Explanation:

The conversion of pyruvate to acetyl CoA is a critical step that links glycolysis, the initial phase of glucose catabolism, to the Krebs cycle, where further energy extraction occurs. The overall chemical equation representing the conversion of pyruvate (a three-carbon molecule) to acetyl CoA (a two-carbon molecule) is:

C3H3O3- (pyruvate) + CoA-SH + NAD+ → CH3-C-S-CoA (acetyl CoA) + CO2 + NADH + H+

This process, known as pyruvate oxidation, is catalyzed by the multi-enzyme complex pyruvate dehydrogenase. It involves the oxidative decarboxylation of pyruvate, resulting in one molecule of carbon dioxide and the reduction of NAD+ to NADH. The transferred acetyl group is then bound to Coenzyme A, forming acetyl CoA, which subsequently enters the Krebs cycle within the mitochondria.

1. Resonance Form 1: O-N-O with a negative charge on the right oxygen.

2. Resonance Form 2: O-N-O with a negative charge on the left oxygen.

Certainly, here are both resonance forms of the nitrite ion, NO2-:

Resonance Form 1:

     O

    / \

   N   O-

In this structure, the oxygen atom on the left has three lone pairs, and the nitrogen atom has one lone pair. The oxygen on the right is negatively charged (-1), while the nitrogen has no formal charge.

Resonance Form 2:

     O-

      \

       N

        \

         O

In this structure, the oxygen atom on the left is negatively charged (-1), the nitrogen atom has no formal charge, and the oxygen on the right has two lone pairs.

These resonance forms illustrate how the electrons in the nitrite ion are delocalized, and the actual electron distribution is a blend of these two structures, resulting in a partial negative charge on both oxygen atoms and a partial positive charge on the nitrogen atom.

For more such questions on Molecular Structure

https://brainly.com/question/32035336

#SPJ6

The nitrite ion, NO2-, has two resonance forms. In the first, one oxygen is double-bonded to nitrogen while the other is single-bonded, with the latter carrying a negative charge. The second form is the same, but the doubly bonded oxygen carries the negative charge. The actual structure of the ion is an average of these forms.

To draw the resonance forms of the nitrite ion, NO2-, it is necessary to understand the concept of resonance. If more than one Lewis structure can be written for a molecule or ion with the same arrangement of atoms, the actual distribution of electrons is an average of that shown by these structures. In the case of NO2-, the distribution of electrons in the nitrogen-oxygen bonds is an average of a double bond and a single bond. This means there are two resonance forms for NO2-.

The first resonance form can be represented as :N=O—O: wherein nitrogen is double bonded to one oxygen atom and single bonded to the other, with a lone pair on the singly bonded oxygen giving it a negative formal charge. The second resonance form is :N—O=O: wherein nitrogen is double bonded to one oxygen atom and singly bonded to the other just like in the first resonance form but now the double bonded oxygen atom absorbs the lone pair, causing it to have a negative formal charge.

These two resonance forms together represent the actual electronic structure of the nitrite ion, which we call a resonance hybrid. It's important to remember that resonance in chemistry doesn't mean that the molecule is switching between these forms, rather the actual structure is an average of these forms.

https://brainly.com/question/30762805

#SPJ12

The question concerns Boyle's Law in physics, which states that pressure and volume of a gas are inversely related at a constant temperature. Using the provided initial conditions and the final pressure, the final volume of the gas can be calculated using Boyle's Law to be approximately 2.33 L.

The subject matter of this question falls under the concept of gases in Physics, especially where Boyle's Law is applicable. Boyle's Law states that the pressure (P) and volume (V) of a gas have an inverse relationship when the temperature is kept constant. In other words, an increase in pressure causes a decrease in volume and vice versa.

To solve the student's question, we'll use the equation of Boyle's Law: P1*V1 = P2*V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

In this case, the standard pressure (P1), which is generally 760 mm Hg, and the initial volume (V1) is 3.5 L. The final pressure, P2, is given as 1140 mm Hg, and we need to find the final volume (V2).

Substituting the values we know into the Boyle's Law equation: (760mm Hg * 3.5 L) = (1140 mm Hg * V2) Solving for 'V2' gives us a final volume of approximately 2.33 L. Therefore, the volume of the gas when the pressure is 1140 mm Hg will be about 2.33 L.

https://brainly.com/question/21184611

#SPJ3

Answer:

[tex]m_{Na_2CO_3}=2.0gNa_2CO_3[/tex]

Explanation:

Hello,

In this case, we consider the equation defining molarity, in order to compute the mass that is present into 125 mL of an aqueous 0.15M of sodium carbonate (solute), Na₂CO₃ as shown below:

[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]

Now, since the unknown is the mass which comes from the moles, by solving for it and subsequently using its molar mass, one obtains:

[tex]m_{Na_2CO_3}=125mL*\frac{1L}{1000mL}*0.15\frac{mol{Na_2CO_3}}{L}*\frac{105.98gNa_2CO_3}{1mol{Na_2CO_3}}   \\m_{Na_2CO_3}=2.0gNa_2CO_3[/tex]

Best regards.

Cows can derive energy from cellulose-rich grass due to the presence of symbiotic bacteria in their digestive system, which secrete an enzyme called cellulase, breaking down cellulose into usable glucose monomers. Their multiple-chambered stomach and appendix further facilitate cellulose digestion. This unique adaptation allows cows and other ruminants to utilize cellulose as an energy source.

Cows and other herbivores are able to derive energy from cellulose-rich grass due to symbiotic bacteria that reside in their rumen, a part of their digestive system. These bacteria secrete an enzyme called cellulase which breaks down cellulose into glucose monomers, providing a viable energy source for the animal. Herbivores, such as cows, buffalos, and horses, possess a multiple-chambered stomach where cellulose digestion mostly occurs, and also an appendix where bacteria help in further breaking down cellulose.

Cellulose is composed of glucose monomers packed tightly as extended long chains, giving it its high tensile strength and rigidity, an important attribute for plant cells. It's interesting to note that every other glucose monomer in cellulose is flipped over, which adds to its complexity and indigestibility in many animals including humans. However, the unique digestive system of ruminants, rooms for cellulase-secreting bacteria such as those in the rumen and appendix, enable them to utilize cellulose as an energy source.

https://brainly.com/question/31563779

#SPJ2