Two compounds might have spots with the same rf value in a chromatography experiment and not be identical compounds. Which proposed chromatography experiment could best help determine whether the compounds are identical?.

Answers

Answer 1

The repeat of the original chromatography experiment with a different solvent might could best help determine whether the compounds are identical.

What is chromatography?

Chromatography is a technique used in the laboratory to physically separate two different objects and/or materials.

In chromatography, these materials are separated into two phases called the stationary phase and the movement phase.

Chromatography is also used to purify a given substance and thus determine its exact composition.

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Related Questions

can someone pls help me

Answers

Answer:

the picture is blurd

Explanation:

What three things does force cause?

Answers

Forces can cause objects to accelerate , decelerate , stop , start moving , change direction , change shape , or even turn

Hello people ~
CO2 extinguishers help extinguish fires by –

A. Cutting supply of nitrogen.

B. Limiting the supply of fuel.

C. Reducing the heat of the surroundings.

D. Cutting the supply of oxygen​

Answers

Answer:

Cutting the supply of oxygen

Explanation:

We know that a thing need three things to burn

Oxygen Heat flammable object .

Co_2 stops oxygen supply so fire gets extinguished

Some bacteria live in the roots of plants like soybeans and peas.

Bacteria growing on plant roots.
What is the role of these bacteria in the nitrogen cycle?

to absorb nitrogen-containing compounds from the soil
to release free nitrogen into the atmosphere
to break down nitrogen-containing compounds in dead organisms
to convert free nitrogen into usable nitrogen

70 points!

Answers

Answer:

to release free nitrogen into the atmosphere. This is the answer.

Answer:

to convert free nitrogen into usable nitrogen

Explanation:

got it right on the test boi

Step 5: place the remaining hydroxy and hydrogen substituents. Review the previous steps to determine the position of the substituents on carbons 1 and 5

Answers

Based on the functional groups present in organic compounds, the compound formed from adding hydroxy and hydrogen substituents to carbon atoms is an alcohol.

What are alcohols?

Alcohols are organic compounds whose functional group is the hydroxy radical.

The simplest alcohol is methanol whose molecular formula is CH3OH.

The hydroxy group in alcohols are responsible for their properties such as:

solubility- alcohols are soluble in waterhigh boiling points polarity

Therefore, the compound formed from adding hydroxy and hydrogen substituents to carbon atoms is an alcohol.

The number of protons and neutrons in an atom is that atoms __ number.

Answers

Answer: Mass number

If you look at the periodic table, you can simply find the mass number either on the top or bottom of the element.

HELP1!!!!!!!!!!!!!!!!!!!!!!!!!!!111

Answers

Answer:

I believe c

Explanation:

The chemical equation below shows the formation of aluminum oxide (al2o3) from aluminum (al) and oxygen (o2). 4al 3o2 right arrow. 2al2o3 the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 must react to form 3.80 mol of al2o3? 60.8 grams 81.1 grams 122 grams 182 grams

Answers

The mass of oxygen must react to form 3.80 mol of Al₂O₃ in the given reaction is 182 grams.

How do we calculate mass from moles?

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

4Al + 3O₂ → 2Al₂O₃

From the stoichiometry of the reaction it is clear that,

2 moles of Al₂O₃ = obtained from 3 moles of O₂

3.80 moles of Al₂O₃ = obtained from 3/2×3.80=5.7 moles of O₂

Now we calculate the mass of oxygen of 5.7 moles as:

W = (5.7mol)(32g/mol) = 182.4 grams or 182g

Hence option (4) is correct.

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Answer: 182 grams

Explanation:

Describe the patterns that can be observed for elements on a Periodic table.

Answers

Answer:

mark brainliestbrainliestbrainliest.

Explanation:

The periodic table is an arrangement of the elements in order of increasing atomic number. Elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods.

Please help-

Answers

Answer:

you are not posted question

Which bonds are formed when elements share electrons and form molecules?.

Answers

Answer:

A covalent bond

Explanation:

the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.

On all aerosol cans you see a warning that tells you to keep the can
away from heat because of the danger of explosion. What is the
potential volume of the gas contained in a 500.0 mL can at 25°C if it
were heated to 54°C. In other words if the can could expand to allow
the gas to take up a greater volume, what would be the new volume of
the gas when heated as previously described?

Answers

Gas laws show the relationship between tempertaure, pressure, volume, volume and number of moles. The new volume of the gas is 549 mL.

What is Charles law?

Charles law states that, the volume of a given mass of gas is directly proportional to its temperature at constant pressure .

Given that;

V1 = 500.0 mL

T1 = 25°C  or 298 K

V2 = ?

T2 = 54°C + 273 = 327 K

Since;

V1/T1 = V2/T2

V1T2 = V2T1

V2 = V1T2/T1

V2= 500.0 mL * 327 K/298 K

V2 = 549 mL

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For 480. 0 mL m L of pure water, calculate the initial pH p H and the final pH p H after adding 2. 0×10−2 mol m o l of HCl H C l

Answers

Given that the volume of the pure water is 480 mL and the mole of HCl added to the water is 2×10¯² mole. Therefore, the Initial and final pH of the water are:

1. The initial pH of the pure water is 7

2. The final pH of the water is 1.38

What is pH ?

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

pH scale

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

0 to 6 indicates acid 7 indicates neutral (pure water) 8 to 14 indicate basic

How to determine the molarity Volume = 480 mL = 480 / 1000 = 0.48 L Mole of HCl = 2×10¯² mole Molarity =?

Molarity = mole / Volume

Molarity = 2×10¯² / 0.48

Molarity = 4.17×10¯² M

Dissociation equation

HCl(aq) —> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

4.17×10¯² M HCl will also contain 4.17×10¯² M H⁺

How to determine the pH Hydrogen ion concentration [H⁺] = 4.17×10¯² MpH =?

pH = –Log H⁺

pH = –Log 4.17×10¯²

pH = 1.38

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How many moles of O2 are required for the complete reaction of 1.60 moles of C2H4 to form CO2 and H2O? Use the balanced equation: C2H4 + 3O2 --> 2CO2 + 2H2O

113 mol
4.80 mol
48.0 mol
0.64 mol

Answers

Answer:

4.80 mol is the answer

Explanation:

please mark me as brainlist..

4.8 moles

Balanced equation: C₂H₄ + 3O₂ --> 2CO₂ + 2H₂O

C₂H₄  : 1.60 moles

use molar ratio:

3O₂ : C₂H₄

3 : 1

moles of O₂ : 3 * 1.6 = 4.8 moles

A monosaccharide is formed from a polysaccharide in what kind of reaction?.

Answers

Answer:

Catabolic reactions

Explanation:

Anabolic reactions combine monosaccharides to form polysaccharides, fatty acids to form triglycerides, amino acids to form proteins, and nucleotides to form nucleic acids. These processes require energy in the form of ATP molecules generated by catabolic reactions.

By titration, 13.5 mL of aqueous H2SO4 neutralized 21.8 mL of 0.0419 M LiOH solution. What was the molarity of the aqueous acid solution?

Answers

13.5 mL of 0.0339 M H₂SO₄ is titrated with 21.8 mL of 0.0419 M LiOH.

What is titration?

Titration is a process of chemical analysis in which the quantity of some constituent of a sample is determined by adding to the measured sample an exactly known quantity of another substance with which the desired constituent reacts in a definite, known proportion.

Step 1: Write the balanced equation.

H₂SO₄ + 2 LiOH ⇒ Li₂SO₄ + 2 H₂O

Step 2: Calculate the reacting moles of LiOH.

0.0218 L × 0.0419 mol/L = 0.000913 mol

Step 3: Calculate the reacting moles of H₂SO₄.

The molar ratio of H₂SO₄ to LiOH is 2:1.

0.000913 mol LiOH × (1 mol H₂SO₄/2 mol LiOH) = 0.000457 mol H₂SO₄

Step 4: Calculate the molarity of H₂SO₄.

[H₂SO₄] = 0.000457 mol/0.0135 L= 0.0339 M

13.5 mL of 0.0339 M H₂SO₄ is titrated with 21.8 mL of 0.0419 M LiOH.

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All of the following are true about scientific theories, except:
O A theory is an explanation of why
something happens.
O Theories must have been extensively
tested.
O A theory can be the result of one
scientific investigation.
O Theories are based on many
observations.

Answers

I think it’s the 3 one

7.

Which substance, if added to a saturated solution of

NH4OH, would cause the pH of the solution to increase?

A. HCI

B. NH4C1

C. LiOH

D. CH3OH

Answers

Answer:

C LiOH

Explanation:

because it is an hydroxide as well as it is alkaline

Answer:

C. LiOH

Explanation:

LiOH is a strong base while the others are acids

Answer these for 40ps

Answers

Answer:

7. H

8. F

9. G.

10. D

11. A

12. E

13. B

14. C

Use the bond energy to calculate an approximate value of δh for the following reaction. Which is the more stable form of fno2?

Answers

The enthalpy of reaction or ∆H reaction is the difference between the bond energy of the reactants and the bond energy of the products.

What is ∆H reaction?

The term ∆H reaction refers to the heat that is evolved or absorbed in a chemical reaction. It is also known as the enthalpy of reaction.

The question is incoherent but I will try to answer as much as possible. Using the values of bond energy, ∆H reaction = Bond energy of reactants - bond energy of products. This will give us the enthalpy of reaction.

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Sample data from titration lab:
Amount of analyte; (HCI): 19.54 mL
Amount of titrant: (NaOH): 12.33mL
Molar concentration of NaOH: 0.5 mol
The molarity of the HCl would be:
VM
The numbers I used are probably wrong

Answers

Based on the volumes of HCl and NaOH reacted, the molarity of HCl is 0.3 M

What a titration?

A titration is a process in volumetric analysis in which the given volume of a substance of known concentration reacting with a volume another solution of unknown concentration is used to determine the unknown concentration of another solution

In the titration given, an unknown concentration of HCl reacts with 0.5 M NaOH solution.

The equation of the reaction is given below:

HCl + NaOH -----> NaCl + H2O

At equivalence point, 1 mole of HCl reacts with 1 moles of NaOH

moles of NaOH = 12.33 × 0.5 = 6.165 moles

moles of HCl = 19.54 × M

From above, moles of HCl = 6.165 moles

Molarity of HCl, M = 6.165/19.54

Molarity of HCl = 0.3 M

Therefore, the molarity of HCl is 0.3 M

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Answer:

0.317

Explanation:

right on edge

Which step accurately describes how to measure the final burette volume? Locate the bottom of the meniscus and record volume to the nearest 0. 01 mL. Locate the bottom of the meniscus and record volume to the nearest 0. 1 mL. Locate the top of the meniscus and record volume to the nearest 0. 01 mL. Locate the top of the meniscus and record volume to the nearest 0. 1 mL.

Answers

Burette is the lab equipment used to estimate the volume of liquid during titration. The volume is measured by the bottom meniscus to the nearest 0.01 mL.

What is a burette?

Burette is an instrument used in quantitative analysis like the volume of the sample in the titration methods and is made of a glass tube.

In the volumetric analysis, the final volume of the liquid is measured by locating the lower meniscus and is taken approximately near 0.01 ml as the burettes have markings of 0.1 mL.

Therefore, option a. locate the bottom meniscus and mark nearest to 0.01 mL.

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Name two elements that are extracted from
their compounds by electrolysis.

Answers

Answer:

Hydrogen and oxygen

Explanation:

This is the most common compound water

When water goes through electrolysis it produces two elementsH_2 and O_2

The reaction is given by

H_2O-->H_2+O_2

Answer:

Hydrogen and helium is the answer

A chemistry teacher adds 50. 0 mL of 1. 50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution? Use M subscript i V subscript i equals M subscript f V subscript f. 0. 300 M 0. 375 M 6. 00 M 7. 50 M.

Answers

The concentration of the final solution after mixing water into the H₂SO₄ is 0.375 M.

How do we calculate the concentration?

Concentration in terms of molarity will be calculated by using the below formula as:

M₁V₁ = M₂V₂, where

M₁ = molarity of H₂SO₄ = 1.50 M

V₁ = volume of H₂SO₄ = 50 mL

M₂ = molarity of water = ?

V₂ = volume of water = 200 mL

On putting all values on the above equation, we get

M₂ = (1.50)(50) / (200) = 0.375 M

Hence option (2) is correct.

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Calculate the cell potential for the galvanic cell in which the reaction


Al(s)+Au3+(aq)↽−−⇀ Al3+(aq)+Au(s)

Al

(

s

)

+

Au

3

+

(

aq

)










Al

3

+

(

aq

)

+

Au

(

s

)



occurs at 25 ∘C

25




C

, given that [Al3+]=0. 00170 M

[

Al

3

+

]

=

0. 00170

M

and [Au3+]=0. 795 M

[

Au

3

+

]

=

0. 795

M

Answers

Explanation:

those to arrows between states which makes the chemical unstable right now so you need to change both those signs good luck!

Part 1. determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. show your work.

part 2. if this sample was placed under extreme pressure, describe how the actual volume would compare to the predicted volume. explain your answer.

Answers

The molar mass of 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm is 9.15g/mol.If this sample was placed under extreme pressure, the volume of the sample will decrease.

How to calculate molar mass?

The molar mass of a substance can be calculated by first calculating the number of moles using ideal gas law equation:

PV = nRT

Where;

P = pressureV = volumeT = temperatureR = gas law constantn = no of moles

0.98 × 1.2 = n × 0.0821 × 287

1.18 = 23.56n

n = 1.18/23.56

n = 0.05moles

mole = mass/molar mass

0.05 = 0.458/mm

molar mass = 0.458/0.05

molar mass = 9.15g/mol

Therefore, the molar mass of 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm is 9.15g/molIf this sample was placed under extreme pressure, the volume of the sample will decrease.

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Why is carbon dioxide called a gas and not vapour?

Answers

Explanation:

CO2 is called as gas because it exist in single thermodynamics state i.e CO exist in gases state only at room temperature.

Briefly explain the two ways Avogadro's number was calculated.​

Answers

The value of Avogadro's number was obtained by dividing the charge of a mole of electrons by the charge of a single electron which is equal to 6.02214154 x 1023 particles per mole.

The most common used way is

n=Charge of one mole of atom /charge of one single atom

There can be another derived way

No of molecules=No of moles ×Avagadro noAvagadro no=No of molecules/No of moles

what are the properties of aluminium and their use​

Answers

Answer: Answers are in bulleted lists.

Explanation: Aluminum...

has a low densityis non-toxichas a high thermal conductivityhas excellent corrosion resistancecan be easily cast, whether it's machined or formed.

Uses:

Aeroplane PartsCansWindow framesBeer kegsFoils Kitchen utensils

Have a great day! :)

Which mineral reacts readily with cool, dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas?.

Answers

Answer:

The acid reacts with the mineral to release CO2 gas that is bound into the crystal as carbonate ion.

Explanation: i got it corrcet

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