in tlc chromatography, the ___represents the stationary phase and the ___ represents the mobile phase.

The combination in Option D , NaCl + HCl  is not a buffer

A buffer is a solution which is added to resist changes in pH when a small amount of acid.

It is generally made of weak base with its conjugated acid ,  weak acid with its conjugated base.

A buffer comes with a defined with a capacity .

Among the given option the solution mixture  which is not a buffer is

NaCl + HCl

as a buffer is not made of a strong acid and its salt.

Therefore Option D is not a buffer.

To know more about Buffer

https://brainly.com/question/3435382

#SPJ1

Answer:

d. supersaturated.

Explanation:

A solution naturally contains a solute and a solvent. The solute is the solid substance that dissolves in the solvent, which is usually a liquid substance. A solution has a maximum amount of solute that can dissolve in its constituent solvent.

However, when the amount of dissolved solute in a solution at a given temperature is greater than the amount that can permanently remain in the solution at that temperature, the solution is said to be SUPERSATURATED. This means that the solution contains more than the maximum amount of solute.

Acacia ant and acacias animals are an example of coevolution

Coevolution is the reciprocal evolutionary change in a set of interacting population over time resulting from the interaction between those population and an example of coevolution that is not characteristics of an arm race but one which provides a mutual benefit to both a plant species and insect is that of the acacia ant and acacia plant and many cases of coevolution can be found between plants and insects

Know more about animal

https://brainly.com/question/28711835

#SPJ1

Answer:

The value of Kp at this temperature is 9.0*10³

Explanation:

The equilibrium constant Kp describes the relationship that exists between the partial pressures of the reactants and products, while Kc represents the relationship that exists between the concentrations of the reactants and products that participate in the reaction.

The general relationship between the constants Kp and Kc results:

Kp=Kc*\((R*T)^{moles of product - moles of reagent}\)

In this case:

Replacing:

Kp=2.2*10⁵*\((0.0821*298)^{-1}\)

Solving:

Kp≅9.0*10³

The value of Kp at this temperature is 9.0*10³

The volume of an object that floats on the water can be found by making it sink forcefully. For this the object is tied to another object that can easily sink. The floating object will sink in the water and its volume can be determined.

Volume is a measure of three-dimensional space. It is often quantified numerically using SI derived units or by various imperial or US customary units . The definition of length (cubed) is interrelated with volume. The volume of a container is generally understood to be the capacity of the container; i.e., the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces.

In ancient times, volume is measured using similar-shaped natural containers and later on, standardized containers. Some simple three-dimensional shapes can have their volume easily calculated using arithmetic formulas. Volumes of more complicated shapes can be calculated with integral calculus if a formula exists for the shape's boundary. Zero-, one- and two-dimensional objects have no volume; in fourth and higher dimensions, an analogous concept to the normal volume is the hypervolume.

Learn more about volume,here:

https://brainly.com/question/1578538

#SPJ9

Balanced reaction is given by

\(\\ \rm\Rrightarrow 2C_4H_10+13O_2\longrightarrow 8O_2+10H_2O\)

On both sides

Hence balanced

Molar mass of butane:-

Moles of Butane:-

#16

Moles of CO_2:-

Mass of CO_2:-

#17

Moles of O_2

Mass of O_2

Answer:

In carbon dioxide, on the right, there is 2.666 g of oxygen for every gram of carbon. So the ratio of oxygen in the two compounds is 1:2, a small whole number ratio

please mark me as the brainliest answer and please please pleaseeee follow me.

Answer:

\(\Delta T=18.24\°C\)

Explanation:

Hello,

In this case, since the equation for computing the heat in terms of mass, specific heat and temperature change is:

\(Q=mCp\Delta T\)

For the given heat and mass, and considering the specific heat of iron to be 0.444 kJ/(kg°C), the resulting temperature change is:

\(\Delta T=\frac{Q}{mCp}=\frac{97.2kJ}{12.0kg*0.444\frac{kJ}{kg\°C}}\\ \\\Delta T=18.24\°C\)

Best regards.

Answer: c

Explanation:

Answer:

C. The more hydrogen bonds a molecule can make, the higher the surface tension.

Explanation:

Answer:  

  The speed of an object is the distance the object travels in one unit of time. To calculate the speed of an object, divide the distance the object travels by the amount of time it takes to travel that distance.   Explanation:

Answer: SPEED is the distance traveled during a specific unit of time.

Explanation: I got it right! Have a good day guys :>

Answer:

1.6x10⁻⁶M

1.6x10⁻⁶m

0.1928ppm

192.8ppb

Explanation:

The first dilution of the solution is from 1mL to 15mL. The second from 2mL to 25mL and the third from 1.5mL to 250mL. That means molarity is:

50mM =

0.050M * (1mL / 15mL) * (2mL / 25mL) * (1.5mL / 250mL) = 1.6x10⁻⁶M

Molality is defined as the ratio between moles and kg. Assuming the density of the solution is 1kg/L, molality is 1.6x10⁻⁶m

ppm is the ratio between milligrams and Liters:

1.6x10⁻⁶mol / L * (120.5g /mol) * (1000mg / g) = 0.1928mg/L = 0.1928ppm

And ppb = 1000*ppm;

0.1928ppm*1000 = 192.8ppb

The concentration in weight percent is 40%

The following data were obtained from the question:

Concentration in weight percent = (mass of sugar / total mass) × 100

Concentration in weight percent = (6.000 / 15.000) × 100

Concentration in weight percent = 0.4 × 100

Concentration in weight percent = 40%

Learn more about percentage composition:

https://brainly.com/question/23158390

#SPJ1

Answer

Explanation

Electron affinity is one of the periodic properties of elements in the periodic table. The electron affinity of an atom or molecule is the propensity for that particle to gain an electron.

There are general trends in electron affinity across and down the periodic table of elements. Electron affinity generally increases across a period in the periodic table and sometimes decreases down a group.

Therefore the EA ranking of the given elements from most positive to most negative are:

Silver nitrate, sodium hydroxide, ammonium chloride, and potassium iodide (KI, AgNO3, NH4Cl) (NaOH).

One of your blood's electrolytes is chloride. Chloride blood tests verify that you have the right amounts of chloride within your blood for good health. Chloride levels in the blood can be abnormal for a variety of reasons, including dehydration, vomiting, and certain medical diseases.

A measurement of a chloride concentration is the blood chloride value. Specifically, the number of milliequivalents of chloride per liter. Hypochloremia, then, is a condition in which your blood chloride concentration is below normal. Hyperchloremia is the medical term for having excessive levels of chloride within your blood.

To know more about chloride visit:

https://brainly.com/question/13211879

#SPJ1

Answer:

Evaporation

Explanation:

Feel free to give brainliest.

Have an amazing day!

Answer:

B and D

Explanation:

If we use the info given we have a band a 3300 cm-1 and 2200 cm-1 this indicates that we have an alkyne functional group. Additionally, the hydrogenation of the unknown molecule will consume two moles of hydrogens this fits with the 2 pi bonds in the alkyne functional group. So, we can discard "a" and "e". The product of this hydrogenation is 2-methylhexane therefore we can discard c because the methyl group is placed on carbon 3. Structures b and d can work.

See figure 1

I hope it helps!

Answer: Decomposition reaction

Explanation:

      This reaction type is a decomposition reaction. The single compound reactant is "breaking up" into two or more products.

Answer:

64.3 kilograms = 64300000 milligrams

Hope this helps :)

A reaction in which reactants react to form products is called forward reaction. In some reactions, products would change back into reactants which is called backward reaction.

In forward reaction, the reactants react with each other and forms product as a result. The reaction occurs from left to right in an equation.

In backward reaction, the products that was formed would revert back to form reactants due to surrounding conditions. The reaction occurs from right to left in an equation.

The type of reaction where both forward and backward reaction takes place is called reversible reaction. When the rate of the reaction between forward and backward reaction becomes equal, it reaches a state of equilibrium.

To know more about Reversible reaction

https://brainly.com/question/16614705

#SPJ1

The number of SO2 molecules in 2.32 mol of SO2  is 1.39 × 10²³ molecules.

given that :

number of moles of SO₂ = 2.32 mol

Avogadro's number = 6.022 × 10²

number moles can be calculated by the following formula :

number of moles = mass / molar mass

number of molecules of SO² in 2.32 moles is given as :

number of molecules of SO₂ = 2.32 mole × 6.022 × 10²³ molecules / mole

number of molecules of SO₂ =  1.39 × 10²⁴ molecules.

Thus, The number of SO2 molecules in 2.32 mol of SO2  is 1.39 × 10²⁴ molecules.

To learn more about number molecules here

https://brainly.com/question/28319191

#SPJ1

Answer: I believe the answer is A, heat moves from warmer objects to cooler objects. I know for sure it isn’t C or D though so A

The heat is transferred from one object to another as heat moves from warmer objects to cooler objects. The correct option is A.

There are three ways to transfer heat. They are conduction, convection, and radiation. Heat travels from one body to another body. If the temperature of two objects is different, then the heat travels from higher temperature to lower temperature.

Conduction is the transfer of energy when two objects ate in contact with each other. Convection is a transfer between object and environment. Radiation is when transferred by emission of electromagnetic radiation.

Thus, the correct option is A. Heat moves from warmer objects to cooler objects.

Learn more about the transfer of heat, here:

https://brainly.com/question/13433948

#SPJ5

Answer:

b) 3x10³m³

Explanation:

The volume of each astronaut breathing in m³ is:

500cm³ * (1x10⁻⁶m³ / 1cm³) = 5x10⁻⁴m³

In 1 minute, the volume is:

5x10⁻⁴m³ * 15 = 7.5x10⁻³m³

In 1 hour:

7.5x10⁻³m³ /min  * (60min / 1 hour) = 0.45m³/h

In 1 day:

0.45m³/h * (24h / 1 day) = 10.8m³/day

In 1 year:

10.8m³/day * (365 days / 1 year) = 3942m³ = 3.9x10³m³

That is approximately:

Answer: 55.5 oC is 0.014 atm (3rd decimal point)

Explanation:

The Clausius-Clapeyron equation is given as:

ln(P2/P1) = -(ΔH_vap/R) * (1/T2 - 1/T1)

where:

P1 = vapor pressure at temperature T1

P2 = vapor pressure at temperature T2

ΔH_vap = enthalpy of vaporization

R = gas constant = 8.314 J/(mol*K)

Converting the enthalpy of vaporization to J/mol:

ΔH_vap = 35.2 kJ/mol = 35,200 J/mol

Converting temperatures to Kelvin:

T1 = 64.7 + 273.15 = 337.85 K

T2 = 55.5 + 273.15 = 328.65 K

Substituting the values into the equation and solving for P2:

ln(P2/1 atm) = -(35,200 J/mol / 8.314 J/(mol*K)) * (1/328.65 K - 1/337.85 K)

ln(P2/1 atm) = -4.231

P2/1 atm = e^(-4.231)

P2 = 0.014 atm

Therefore, the vapor pressure for methanol at 55.5 oC is 0.014 atm, to the third decimal point.

Answer:

176

Explanation:

M1V1 =M2V2

200 X 0.880

The acid dissociation constant(Ka) is 0.0095

The reaction for this dissociation of acid is

HSO4 ⇄H+ + SO4 -2

The dissociation constant can be determined from the following expression

\(Ka= \frac{[H+] [SO4]-2}{[HSO4}\)  

[H+] = 10-PH

       = 10-1.35

[H+]  = 0.0447

[H+] = 0.0447 mol / L

From equation, [H+] = [SO4-2] = 0.0447 mol / L

[SO4-2] = 0.0447 mol / L

From the values of [H+], [SO4-2] and [HSO4] Ka can be calculated as follows,

Ka = 0.0447 * 0.0447 / 0.200

     = 0.0019 / 0.200

     = 0.0095

Hence the value of the acid dissociation constant (Ka) for the given reaction is  0.0095

Learn more about the acid dissociation constant on

https://brainly.com/question/10038290

#SPJ1

Answer:

zinc + hydrochloric acid = zinc chloride + hydrogen

copper carbonate + sulfuric acid = copper sulfate + carbon dioxide + water

copper + nitric acid = copper nitrate + nitrogen dioxide + water

Explanation:

Zn + 2HCl → ZnCl2 + H2

CuCO3 + H2SO4 → CuSO4 + CO2 + H2O

Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O

Answer:

zinc + hydrochloric acid = zinc chloride + hydrogen

copper carbonate + sulfuric acid = copper sulfate + carbon dioxide + water

zinc + nitric acid = zinc nitrate + hydrogen gas + water

Answer: 0.78 Cal

Explanation:

3265J * (1cal/4.184J) * (1Cal/1000cal) = 0.78 Cal

In the given reaction, chlorine (\(Cl_{2}\)) is being reduced.

In the given reaction:

Mg + \(Cl_{2}\)→ \(Mg^2^+\) + 2\(Cl^-\)

The reactants are magnesium (Mg) and chlorine gas ( \(Cl_{2}\)), and the products are magnesium cations (\(Mg^2^+\)) and chloride anions (\(Cl^-\)).

To determine which species is being reduced, we need to compare the oxidation states (or oxidation numbers) of the elements before and after the reaction. The element that undergoes a decrease in oxidation state is being reduced.

In this reaction, the oxidation state of magnesium changes from 0 to +2. Since the oxidation state of magnesium increases, it is undergoing oxidation, not reduction.

On the other hand, the oxidation state of chlorine changes from 0 to -1. The chlorine atoms in  \(Cl_{2}\) have an oxidation state of 0, while in the chloride ions (\(Cl^-\)), the oxidation state is -1. Since the oxidation state of chlorine decreases, it is being reduced.

Therefore, in the given reaction, chlorine ( \(Cl_{2}\)) is being reduced. It gains electrons and undergoes a decrease in oxidation state from 0 to -1.

for more questions on reduced

https://brainly.com/question/14854495

#SPJ8

you need to add 1.79 mL of 3.0 M HCl to react with 0.45 g of NaHCO3 and produce the most NaCl.

To determine how much 3.0 M HCl is needed to react with 0.45 g of sodium hydrogen carbonate (NaHCO3) and get the most NaCl, you need to first calculate the number of moles of NaHCO3 that you have:

molar mass of NaHCO3 = 84.01 g/mol

moles of NaHCO3 = mass / molar mass = 0.45 g / 84.01 g/mol = 0.00536 mol

Next, you need to determine the stoichiometry of the reaction between NaHCO3 and HCl. The balanced chemical equation for this reaction is:

NaHCO3 + HCl → NaCl + H2O + CO2

From this equation, you can see that one mole of NaHCO3 reacts with one mole of HCl to produce one mole of NaCl. Therefore, you need 0.00536 moles of HCl to react with 0.00536 moles of NaHCO3.

To calculate the volume of 3.0 M HCl needed to provide 0.00536 moles of HCl, you can use the following equation:

moles of solute = concentration x volume of solution (in liters)

Rearranging this equation to solve for the volume of solution gives:

the volume of solution = moles of solute/concentration

Plugging in the values gives:

volume of solution = 0.00536 mol / 3.0 mol/L = 0.00179 L or 1.79 mL

Therefore, you need to add 1.79 mL of 3.0 M HCl to react with 0.45 g of NaHCO3 and produce the most NaCl.

learn more about sodium hydrogen carbonate here

https://brainly.com/question/14240995

#SPJ1

Answer:

c. tertiary.

Explanation:

In this case, we can review the definition of each level of structuration in the proteins:

Primary structure

In the primary structure, the amino acids are linked by peptide bonds. That is, the order of the amino acids is the criterion that defines this type of structure.

Secondary structure

In the secondary structure, we have to look at the way in which the protein is folded. The options are:

  -) Beta-laminar: A structure in which the protein has a planar shape.

  -) Alpha-helix: A structure in which the protein has a cross-strand form.

Tertiary structure

In the tertiary structure, the R groups that the amino acids have in the primary structure can generate interactions with each other. Interactions such as hydrogen bridges, dipole-dipole, hydrophobic interactions. This makes the protein have a very specific three-dimensional structure, on which its function depends.

Quaternary structure

In the quaternary structure, several subunits may be attached, or there may be prostatic groups (metals that can help to attach various protein units).

With all these in mind, the deffinition that fits with the description in the question is the tertiary structure.

I hope it helps!

The specific spatial arrangement of amino acid residues that are close to each other in the polypeptide chain is called the tertiary structure of a protein.

Protein structure is three dimensional in shape, where the atoms are arranged in amino acid chain. The chain is polypeptide containing many amino acid sequences.

The tertiary structure have a single polypeptide chain which is called the backbone.

Therefore, the specific spatial arrangement of amino acid residues that are close to each other in the polypeptide chain is called the tertiary structure of a protein.

Learn more on protein structure here,

https://brainly.com/question/17338734