if you take a square tlc plate and develop a compound mixture with one solvent mixture, dry the plate, and later develop it with a different solvent mixture; you can separate one set of compounds well and then separate another set of compounds well. in which directions should you develop the tlc plate with the two different solvent mixtures? this technique is often used to separate molecules of biological interest.

First acid solution contains 19 liters of 25% acid, second acid contains  19 liters of 45% acid, and the third contains 57 liters of 45% acid.

Let us take x as the liters of 25% acid, y as the liters of 45% acid, and z as the liters of 85% acid.

From this we get an equation:

x + y + z = 95    

0.25x + 0.45y + 0.85z = (0.65)95

By equating both the equation we have:

y + 3z = 190

y = 190 - 3z  

It is given that z = 3y

Solve the system of equations using eliminating or substituting we get:

x + y + z = 95

x + y + 3y = 95

x  + 4y = 95

x = 95- 4y

0.25( 95 - 4y ) + 0.45y + 0.85(3y) = (0.65) 95

23.75- y + 0.45y  + 2.55y = 61.75  

2y = 38

y = 19

x = 95 - 4y

  = 95 -76

   = 19

z = 3y

 = 3× 19

 = 57

Therefore the chemist needs 19 liters of 25% acid, 19 liters of 25% acid and, 57 liters of 85% acid.

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The atomic mass of silicon is calculated to be 28.1087 amu if the three isotopes have relative abundances of 92.23%, 4.67%, and 3.1%, respectively.

The atomic mass of an element can be determined by first changing the percentage abundance of each isotope into decimal form, then multiplying this value by the atomic mass of that isotope. Then the resultant value of each isotope is added together to get the atomic mass of the element.

As the mass of the three isotopes of silicon is 28 amu, 29 amu, and 30 amu  with relative abundances of 92.23%, 4.67%, and 3.1%, respectively, we can calculate the atomic mass of silicon as follows;

si-28 = 92.23% = 92.23/100 = 0.9223

si-29 = 4.67% = 4.67/100 = 0.0467

si-30 = 3.1% = 3.1/100 = 0.031

Now multiplying these values by the atomic mass;

si-28 = 0.9223 × 28 = 25.8244

si-29 = 0.0467 × 29 = 1.3543

si-30 = 0.031 × 30 = 0.93

Now adding these values together;

atomic mass of silicon = 25.8244 + 1.3543 + 0.93

atomic mass of silicon = 28.1087 amu

Therefore; the atomic mass of silicon is calculated to be 28.1087 amu.

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In the sample of soluble iodide, 0.7183 grams iodine are present.

To find the concentration of iodine in grams we must known about molar mass of Silver and molar mass of Iodine.

Molecular weight of Ag = 107.86

Molecular weight of I = 126.90

Molecular weight of  = 107.86 + 126.90 = 234.76

Percentage of I in [tex]AgI[/tex] is = (126.90/234.77) x 100 = 54.05%  

 so  we can convert percentage of Iodine in silver iodide into grams by using formula percentage of Iodine/100x grams of silver Iodide.

so,Concentration of Iodine in grams=[tex]\frac{54.05}{100}[/tex]×1.329

                                                           =0.5405x1.329

                                                            =0.7183g

1.329g of [tex]AgI[/tex] contains 0.7183g of iodine in soluble Iodide.

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What's phase diagram?

The phase diagram is a pressure vs temperature sketch. On the graph, the different physical states of any system at variable temperature and pressure are shown.

What's a Triple point?

A triple point is the point on a phase diagram where all three states of a system (solid, liquid, and gas) are in equilibrium.

What's a Critical point?

A critical point is that point on the phase diagram where the boundary between the liquid phase and gaseous phase vanishes away.

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The reactant will be potassium iodide and lead (ii) nitrate. The products will be lead (ii) iodide and potassium nitrate.

In the field of chemistry, reactants can be described as starting materials that react together in order to form a product. The reactants are the starting material whereas the products are the ending material.

In the case above, potassium iodide and lead (ii) nitrate are the reacting materials as they are the starting materials. On the other hand, lead (ii) iodide and potassium nitrate are the ending products of this reaction.

While writing a chemical equation, the reactants are written on the left-hand side, before an arrow. On the other hand, the products are written on the right-hand side after the arrow.

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Answer:

The easiest way to find the number of neutrons, protons, or electrons is to look at the element's atomic number on the periodic table, that number is equal to the number of protons. Which is equal to the number of electrons unless there's an ion superscript listed after the element.

Explanation:

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The chromatography experiment which would best decide whether the compounds are identical or not is to Repeat the original experiment once more with various solvent systems;

If two things have the same Rf value, they are probably the same compound, but not always. They are definitely distinct compounds if their Rf values differ.

Compounds with a low polarity have higher Rf values than compounds with higher polarity. Compounds' absorptivity typically rises in tandem with their polarity—that is, the more polar a compound is, the more strongly it binds to the adsorbent. Solvents' eluting power increases with polarity. In diverse solvents, different compounds with identical Rf values might behave differently.

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In carrying out the first standardization in this experiment, a student used 0.5793 g of potassium hydrogen phthalate (khp) and 24.55 ml of a NaOH solution are needed to reach the equivalence point then the concentration of student NaOH solution is 0.02455 L

Standardization is the process in which determining the exact concentration of molarity of the solution and here given data is

Mass of potassium hydrogen phthalate (C₈H₅KO₄) = 0.5793 g

Molar mass of potassium hydrogen phthalate (C₈H₅KO₄) = 204.22g/mol

The number of mole of potassium hydrogen phthalate present then,

Number of moles = mass/molar mass

Number of moles = 0.5793 g/204.22g/mol = 0.002836 mole

Volume of NaOH present = 24.55 ml

1 ml =  0.001 L then, 24.55 ml = 24.55 ml×0.001 L = 0.02455 L

The concentration (in mol/l) of the student's naoh solution is 0.02455 L

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To make a 100 ml solution of 0.8 m from a 2.7 m concentrated stock solution we have to take a volume of: 30 ml of the concentrated solution

To solve this problem, the formula and the procedure that we have to use is:

c1 * v1 = c2 * v2

Where:

Information about the problem:

Applying the dissolution of concentrations formula and clearing the volume of the concentrated solution (v1) we get:

c1 * v1 = c2 * v2

v1 = (c2 * v2)/ c1

v1 = (0.8 m * 100 ml)/ 2.7 m

v1= 29.6 ml

By rounding the volume to a whole integer value we have:

v1= 30 ml

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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The concentration of the unknown weak acid solution is 0.228 M.

Acid dissociation constant, K a K text a Ka, and weak acids. Acids that don't entirely dissociate in solution are referred to as weak acids. In other words, any acid that is not a strong acid qualifies as a weak acid. The amount of dissociation determines how strong an acid is; the more dissociation, the stronger the acid.

Equivalent point:

Since the volume is 4.00 mL of the weak acid, and it takes  18.3 mL of 0.0500 M NaOH to reach the equivalence point.

We know that

In the equivalence point, [H⁺] = [OH⁻].

here the given formula C₁V₁=C₂V₂ is used

Here

C₁ = 0.0500 M

V₁ = 18.3 mL

C₂ = ?

V₂ = 4.00 mL

So, the C₂ is

0.0500 M * 18.3mL = C₂ * 4.00 mL

C₂ = 0.228M

The concentration of the unknown weak acid solution is 0.228 M

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The true statement about the reaction is that the reaction reaches equilibrium around 1.5 seconds.

We say that a reaction is reversible if the reaction can proceed both in the forward and the reverse directions. Let us recall that it is possible for a reversible reaction to attain a status of dynamic equilibrium. The status of dynamic equilibrium is the status where the rate of the forward reaction is equal to the rate of reverse reaction.

If we look at the graph as we have it we would notice that there is such a point of dynamic equilibrium as we survey the system around 1.5 seconds.

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The true statement about the reaction is the reaction reaches equilibrium around 1.5 seconds. Thus option D is correct.

Reversible reaction is defined as a reaction in which the transformation of both reactants and products into one another takes place simultaneously.

If a response may occur in both the forward and reverse directions, we say that it is reversible. Let's not forget that a reversible reaction can reach a state of dynamic equilibrium. The condition known as dynamic equilibrium occurs when the forward reaction rate and the backward reaction rate are equal.

If we were to examine the graph as it currently stands, we would see that the system reaches a point of dynamic equilibrium after 1.5 seconds of observation.

Thus, the true statement about the reaction is the reaction reaches equilibrium around 1.5 seconds. Thus option D is correct.

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The conjugate base of a compound is what this compound will be after donating a H⁺.

The comopund in question is H₂BO₃⁻. After it loses 1 H⁺, it will have one less H atom and its charge decrease by one. Its charge is only with a "-" sign, which means its chargeis 1-. After decreasing by one, the charge becomes 2-.

So, the conjugate base will be HBO₃²⁻

Answer:

Neon and lithium.

Explanation:

4x = 79.9 atomic mass

x = 19.98 atomic mass

The element having the nearest atomic mass to 19.98 is neon with an atomic mass of 20.180.

==

8y = 2*(28.085)

8y = 56.17

y =  7.021

The element having the nearest atomic mass to 7.021 is lithium with an atomic mass of 6.94..

As a result, it is a natural bodily alteration. The chemical shape of the material is affected by physical changes, but not its makeup.

Since natural water undergoes a phase transformation cycle from liquid to gas and back to liquid, the production of clouds is a physical shift.

The physical conversion of water from vapour to liquid during cloud formation is known as condensation. When water evaporates during the evaporation process and condenses in the air to form clouds, there is a physical shift that takes place.

Condensation is the process by which water transforms from a gas to a liquid, whereas deposition is the process by which a gas transforms straight into a solid. Clouds are created by these two processes.

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Answer:

There are 400 meters in a hectometer?

Explanation:

Answer:

there are 400 meters in a hectometer?

Explanation:

The composition of the mixture is 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.

The act of combining elements or elements to shape an entire. the ensuing nation or product. manner of being composed; structure: This portrait has an orderly composition. make-up; constitution: His ethical composition becomes impeccable.

A composition can discuss with any innovative painting, be it a quick story, poem, essay, studies paper or a piece of tune. consequently, the principle difference between essay and composition is that essay is a form of composition whereas composition refers to any innovative paintings.

                       H₂ + I₂ = 2HI

initial             2mol  2     0mol

final                                   2.5 mol

limiting reagent is  I₂

2 mole of HI is produced by 1 mole of  I₂

2.5 mole of  I₂ is produced by = 1/2 × 2.5

                                                  = 1.25 mole

The final composition of the mixture = 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.

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Photochemical smog effects largely the growth of plants by interfering in nitrogen cycle and by causing atmospheric pollution.Thus option D is correct.

Photochemical smog is a brown haze in the atmosphere formed by the burning of fuels and from naturally released pollutants when exposed to UV radiation undergo  a series of hydrocarbon reactions to produce photochemical smog.

The main composition of photochemical smog is oxides of nitrogen and it further undergo further reaction with hydrocarbons entered into he atmosphere by burning fuels produce secondary pollutants.

These secondary pollutants again creates air pollution and serious other issues such as reduction in plant growth because they interfere the atmospheric nitrogen cycle which is essential for crop yield.

Hence, photochemical smog can decrease the crop yield in a region and option D is correct.

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Metallic solids,

the atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties. All exhibit high thermal and electrical conductivity, metallic luster, and malleability.

Answer: c. metallic

The pressure of a gas at a constant temperature in a sealed container will gradually decrease. Option C.

Gases are made up of particles molecules or atoms in constant random motion. Gas particles constantly collide with each other and with the walls of the container. These collisions are elastic. That is, there is no net energy loss due to collision. The pressure of a constant temperature gas in a closed container gradually decreases.

The above statement is incorrect because the pressure of a gas at a constant temperature depends on the volume of the gas. If the container is sealed, the volume of gas is also constant. Collisions are completely elastic. When two molecules collide, they change direction and kinetic energy, but all kinetic energy is conserved. Collisions are not sticky. The average kinetic energy of gas molecules is directly proportional to absolute temperature.

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Answer: 4.3

Explanation:

You read from the bottom of the meniscus and each line equals .1 so it reads 4.3.

Answer:

CaCO3

Explanation:

Pure calcite has the composition CaCO3. However, the calcite in limestone often contains a few percent of magnesium. Calcite in limestone is divided into low-magnesium and high-magnesium calcite, with the dividing line placed at a composition of 4% magnesium. High-magnesium calcite retains the calcite mineral structure, which is distinct from that of dolomite, MgCa(CO3)2.[18] Calcite can also contain small quantities of iron and manganese.[19] Manganese may be responsible for the fluorescence of impure calcite, as may traces of organic compounds

The weighted average of the nail size in the sample data is 0.0571 d.

To calculate the weighted average of the nail sizes in the given data, we need to first calculate the total mass of all the nails in the sample. We can do this by multiplying the number of nails of each size by the mass of one nail of that size and then adding up the results:

Total mass = (24 nails of size 3d) x (3.30 g/nail) + (176 nails of size 16d) x (12.25 g/nail)

Total mass = 79.20 g + 2156.00 g

Total mass = 2235.20 g

Next, we can calculate the weight fraction of each nail size by dividing the mass of nails of each size by the total mass:

Weight fraction of 3d nails = (24 nails) x (3.30 g/nail) / 2235.20 g = 0.000360

Weight fraction of 16d nails = (176 nails) x (12.25 g/nail) / 2235.20 g = 0.007901

Finally, we can calculate the weighted average of the nail sizes by multiplying each weight fraction by the corresponding nail size and then adding up the results:

Weighted average = (0.000360 x 3d) + (0.007901 x 16d) = 0.0571 d

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The balloon and the comb definitely have the same electrical charge. Option 2.

According to the law of attraction in physics, like charges repel while unlike charges attract.

Going by this law:

In other words, if 2 objects that have the same charges are brought close to each other, there will be a repulsion. If the 2 objects are of different charges, there will be an attractive force between them.

The students observed that the comb repelled the balloon. The implication is that the comb and the balloon are of the same charge.

This is logical considering the fact that both objects were rubbed against hair. They got their charges during the process of rubbing. An electrostatic force is generated that moves electrons from the hair to the two objects.

Thus, both the balloon and the comb are negatively charged and will, therefore, repel each other.

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The partial pressure of oxygen in such conditions is equal to 160 mm Hg.

As the percentage of oxygen in the air is 21 percent, the mole fraction of oxygen in the air can be calculated as follows;

mole fraction of oxygen in air = 21 ÷ 100 = 0.21

Now we can determine the partial pressure of oxygen by using the equation given by Raoult's law as follows;

partial pressure of oxygen = total pressure of air × mole fraction of oxygen

As the atmospheric pressure at sea level is stated to be 760 mm hg and the calculated value of the mole fraction of oxygen is 0.21, substituting these values in the equation as follows;

partial pressure of oxygen = 760 mm hg × 0.21

partial pressure of oxygen = 160 mm hg

Therefore, the partial pressure of oxygen is calculated to be 160 mm hg.

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Answer:

d

Explanation:

the group's name is called noble gases. hence they are all gases.

A process through which a large molecule such as a protein could leave the cholera cell is generally referred to as: c) exocytosis.

Cholera can be defined as a type of disease which is typically caused by a bacteria that is referred to as Vibrio cholerae. Also, cholera gets into the body of a living organism through an ingestion of contaminated food or water.

Exocytosis simply refers to a process which typically involves a cell releasing a large amount of a material (bulk transport) outside of the cell, especially through the use of vesicles.

This ultimately implies that, exocytosis can be defined as a biological process in which living organisms release (expel) large amount of unwanted material by using the vesicles.

Additionally, exocytosis is a biological process that is initiated by the Golgi apparatus and it can be used to expel a large molecule such as protein from cholera cells.

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Complete Question:

In the first stage of cholera, the bacterium finds a host cell in the small intestine. The bacterium then releases toxic proteins called toxins near the host cell. Through which process could a large molecule such as a protein leave the cholera cell?

a) osmosis

b) diffusion

c) exocytosis

d) endocytosis

The period, group, and valence electrons block of the given element with the electronic configuration [Ne] 3s² 3p5 is Period 3, Group 7, p-block.

The periods in the periodic table are the horizontal rows found in the periodic table.

There are 7 periods in the Periodic Table.

Elements in the same period have the same number of electron shells.

The groups in the periodic table are the vertical columns found in the periodic table.

There are 18 periods in the Periodic Table.

Elements in the same group have the same number of valence electrons.

The electronic configuration of atoms can be used to identify the group and period each element belongs to.

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