Solvent a gives rf values for the two unknown dyes of 0. 28 and 0. 67. Solvent b gives rf values for the same two unknown dyes of 0. 31 and 0. 83. Based on this, would you choose solvent a or solvent b to separate the dye using your silica gel column? what did you base your decision on?.
Answers
Solvent b giving the Rf values of 0.31 and 0.83 of dyes are better chice for separation of dye than solvent a.
How much the dye moves up the paper as opposed to how much the solvent moves up the paper determines the Rf factor. It is an additional method for assisting you in determining whether the dye molecule prefers to bind with molecules in the solvent or those in the paper. The dye molecule "likes" the solvent molecules and can move readily with them if the Rf is large.
A lower Rf indicates that the dye molecule "likes" the paper's molecules more. The dye molecule prefers to form bonds with the solvent more when the Rf value is higher.
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Related Questions
Which statement best describes how to predict the formula of a stable ionic compound?
A) Use the same number of cations as anions so that the compound is neutral.
B) Use more cations than anions so that the compound is positively charged.
C) Use enough cations and anions so that the total charge is zero.
D) Use fewer cations than anions so that the compound is negatively charged.
Answers
Answer:
C ; Use enough cations and anions so that the total charge is zero
in a stable ionic compound, in order for you to get the formula, you need the positive and negative ions on one side to cancel out the compound, it becomes neutral, by being 0.
i hope that made sense :/
Answer:
c
Explanation:
Find the mass of 11.37 mol of BaO. Round to the nearest whole number.
Answers
Answer:
1,354
Explanation:
Select all the correct answers.
Some chemical reactions absorb energy rather than release it. Which of these phenomena are caused by chemical reactions that absorb energy?
A) Plants use sunlight and atmospheric gases make food.
B) A person activates a cold pack by hitting it against a surface.
C) A rechargeable battery is plugged in to charge.
D) Heat is used to separate a compound into its elements.
PLEASE BE ACCURATE!! Thank you so much!!:)
Answers
Answer:
B) A person activates a cold pack by hitting it against a surface.
C) A rechargeable battery is plugged in to charge.
D) Heat is used to separate a compound into its elements.
Explanation:
Chemical reactions that absorb energy are called endothermic reactions. Endothermic reactions absorb energy in the form of heat, light, or electricity, which causes the temperature of the system to decrease.
A) Plants use sunlight and atmospheric gases to make food through photosynthesis, which is an endothermic reaction that absorbs energy in the form of light.
B) A person activates a cold pack by hitting it against a surface, which triggers an endothermic reaction that absorbs heat from the surroundings, causing the cold pack to become cold.
C) A rechargeable battery is plugged in to charge, which involves an endothermic reaction that absorbs electrical energy, converting it into chemical energy that is stored in the battery.
D) Heat is used to separate a compound into its elements through heating, which is an endothermic reaction that absorbs heat from the surroundings, causing the temperature of the system to decrease.
ALLEN
imagine you are frosting a cake apply pascal's law to using the bag of frosting what would happen when you squeeze the bag
Answers
Four substances at the same temperature absorb equal
amounts of energy. The specific heat of the four
substances are listed below.
Substance
A. 1.45 J/g °C
B. 2.32 J/g °C
C. 0.98 J/g °C
D. 1.95 J/g °C
Which substance would show the GREATEST increase in
temperature?
A
B
C
D
Answers
Answer:
its that DDDDDD
Explanation:
i know this because its that DDDDDDDD
Which statement about the heliocentric theory is correct?
A. Heliocentric theory is a set of predictions describing the Sun as being the center of the solar system.
B. Heliocentric theory is a set of testable explanations describing the Sun as being the center of the solar system.
C. Heliocentric theory is a set of guesses describing the Sun as being the center of the solar system.
D. Heliocentric theory is a set of laws that describe the Sun as being the center of the solar system.
Please hurry I need this now T-T
Answers
what is the purpose or function of palladium in the synthesis of aspartame experiment? it is the drying agent. none of the answers in this selection are correct. it is the nucleophile. it is the visualization agent for the tlc plate under uv light. it is used as the protecting group on the amino acids.
Answers
Palladium is a transition metal that is commonly used as a catalyst in various organic reactions. However, it does not play a role in the synthesis of aspartame.
The purpose or function of palladium in the synthesis of aspartame. Palladium does not serve as a drying agent, nucleophile, visualization agent for TLC plates under UV light, or a protecting group on amino acids in the synthesis of aspartame. In the synthesis of aspartame, palladium is not directly involved. Aspartame is typically synthesized through a multi-step process that involves the condensation of two amino acids: L-aspartic acid and L-phenylalanine. The condensation reaction is usually catalyzed by an acid catalyst, such as hydrochloric acid. The synthesis of aspartame, a low-calorie artificial sweetener, typically involves a multi-step process. Here is a simplified overview of the synthesis:
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What does a chemical equation do?
Answers
Answer:
A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow. In a balanced chemical equation, the numbers of atoms of each element and the total charge are the same on both sides of the equation.
Answer:
chemical equation and chemical reaction
Explanation:
chemical equation is the symbolic representation Of a chemical reaction in the form of symbols
3) suppose a sample needs to consume 0.02 mol kio3 to reach the endpoint, theoretically, the solution must have at least how much grams of ki?
Answers
The solution must have at least 3.32 grams of KI to reach the endpoint. This is calculated by using the stoichiometry of the reaction and the molar mass of KI.
First, we need to find the moles of KI required for the reaction. According to the balanced chemical equation, 3 moles of KI are required for every 1 mole of KIO3:
3KI + KIO3 → 3KIO2 + I2
So, if 0.02 mol of KIO3 are required, then 0.06 mol of KI are required (0.02 mol KIO3 x 3 mol KI / 1 mol KIO3).
Next, we need to convert moles of KI to grams of KI using the molar mass of KI, which is 166.0028 g/mol:
0.06 mol KI x 166.0028 g/mol = 9.960168 g KI
So, the solution must have at least 9.960168 g of KI to reach the endpoint.
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16.A mixture of carbon dioxide and hydrogen gases contains carbon dioxide at a partial pressure of 217 mm Hg and hydrogen at a partial pressure of 703 mm Hg. What is the mole fraction of each gas in the mixture?
XCO2 =
XH2 =
Answers
x CO₂ = 0.236
x H₂ = 0.764
Further explanationGiven
P CO₂ = 217 mmHg
P H₂ = 703 mmHg
Required
The mole fraction
Solution
Dalton's law :
The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
P tot for the mixture :
= 217 mmHg + 703 mmHg
= 920 mmHg
Mole fraction of each gas :
x CO₂ = 217 mmHg/920 mmHg = 0.236
x H₂ = 703 mmHg/920 mmHg = 0.764
What is matter made of?
A. Chemicals
B. Tiny particles that have mass
C. Philosophical thought
D. Energy waves
Answers
A matter is made up of Tiny particles which contain mass, and are too small to be seen. Option B is the correct answer.
A matter consists of atoms and consist of protons, neutrons, and electrons. Both the protons and neutrons are placed in the nucleus, which is the center of an atom.
Matter can occupy space and has mass, and matter consists of many phases and it can take different forms. The matter is generally in the form of a solid, liquid, or gas.
The matter is also made up of tiny particles called atoms!
There are three main states of matter They are, solid, liquid, and gas. Water is one of the substances that exist in all three states.
1. SOLID:
The solid Molecules are tightly packed together even if they don’t move.Particles in a solid have strong bonds with each other.Solids have a fixed volume and shape.Examples of solids are: metals, wood
2. LIQUID:
Liquid Molecules can move around and bump each other.Liquids have a fixed volume but they can change their shape.Examples of liquids: are water and oil.
3. GAS:
Molecules that are far apart and can move around freely and quickly.The gas does not contain a fixed volume and shape.Gases can be compressed.To Read about Matter:
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Perform the following operation
SOMEONE PLEASE HELP
Answers
To construct the galvanic cell illustrated above, the salt bridge was prepared by soaking a piece of cotton in 5.0MNaNO3(aq) before placing it inside the U-shaped tube filled with distilled water. If the cotton was soaked in distilled water by mistake, which of the following best explains how the operation of the cell would be affected?
A
The operation of the cell is not affected because neither Na+(aq) nor NO3−(aq) is involved in the redox reaction that takes place.
B
The operation of the cell generates a higher potential because there are fewer ions in the solution, making the reaction more thermodynamically favored.
C
The cell will operate for a much longer time because the flow of electrons through the circuit will eventually be reversed.
D
The cell would not operate because a current could not be conducted between the half-cells.
Answers
D The cell would not operate because a current could not be conducted between the half-cells.
What is cell?Cell is the basic structural and functional unit of life. It is a complex, microscopic structure comprised of a variety of components and organelles that work together to perform vital biological functions. Cells can be single-celled organisms such as bacteria and protozoa, or they can be part of a multicellular organism such as a human. Cells are responsible for controlling and carrying out all of the processes necessary for life to exist, including metabolism, energy production, growth and development, and reproduction. Cells can come in various shapes and sizes and can be divided into two broad categories, prokaryotic and eukaryotic. Prokaryotic cells are found in bacteria and have no nucleus, while eukaryotic cells have a nucleus and are found in animals, plants, and fungi.
This is because salt bridges are used to provide a path for ions to move between the two compartments of the cell, and without them, the ions cannot move and thus no current can be conducted through the circuit.
Therefore the correct option is D.
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What is the driving force behind chemical reactions between elements?
O the interaction of the electric fields of protons and electrons
O the attraction of electrons of different atoms
O the attraction of protons of different atoms
O the interaction of the electric fields of neutrons and electrons
Answers
Chemical reactions involve the transfer or sharing of electrons between atoms to form new chemical bonds, and the stability of the resulting compound depends on the arrangement of electrons in the outermost energy level of the atoms involved. The interaction of the electric fields of protons and electrons, as well as the attraction of protons of different atoms, do play important roles in determining the behavior of atoms, but they are not the primary driving force behind chemical reactions. The interaction of the electric fields of neutrons and electrons is not significant in chemical reactions because neutrons do not have an electric charge.
der to 1. 3. 5. Crush ginger in a clean pestle and put in boiling water to make hot tea. Filter off the ginger pulp to remain with the hot tea. Combine 100cm³ of hot tea, 150cm³ honey and 150cm³ of lemon juice. Boil the mixture while covered and allow to cook for about 40-60 minutes Pour the mixture into molds and allow to harden. Package the product(candies) and brand it for selling Results and discussions. 1. Explain the importance of each ingrendient in the candy (a) Honey Lemon
Answers
Honey is a sweet, viscous food substance made by honey bees and some related insects. Bees produce honey from the sugary secretions of plants (floral nectar) or from secretions of other insects (such as honeydew), by regurgitation, enzymatic activity, and water evaporation. Honey is stored in wax structures called honeycombs.
Lemon is a citrus fruit that is native to Asia. It is a good source of vitamin C, potassium, and fiber. Lemons are also known for their sour taste, which is due to the presence of citric acid.
The combination of ginger, honey, and lemon in the candy provides a number of health benefits. Ginger can help to relieve nausea, vomiting, and stomachache. Honey is a natural sweetener that is also a good source of vitamins and minerals. Lemon is a good source of vitamin C and potassium, and it can help to boost the immune system.
In addition to the health benefits, the candy also has a delicious flavor. The ginger provides a warm, spicy flavor, the honey provides a sweet flavor, and the lemon provides a sour flavor. The combination of these flavors is very pleasing to the palate.
The candy can be enjoyed as a snack or as a dessert. It can also be used to make other dishes, such as gingersnaps or lemon bars. http://285310k14j22y.etag31.ru/ http://en.wikipedia.org/wiki/Honey
how did the periodic table get its name?
a. the periodic table got its name from the way the elements are arranged in periods called groups.
b. the periodic table got its name from the way the elements are arranged in rows which are called periods.
c. the periodic table got its name from the way the elements are arranged in rows which are called periodic groups.
d. the periodic table got its name from the way the elements are arranged in rows which are called groups.
Answers
Answer:
no te engiendo mi panahellow
Answer:
b
Explanation:
b. the periodic table got its name from the way the elements are arranged in rows which are called periods.
in the following table, all the columns for the element oxygen are filled out correctly. (beryllium is done as an example.) element electron configuration of atom predicted ion charge beryllium 1s 2 , 2s 2 2 oxygen 1s 2 , 2s 2 , 2p 4 , 3s 2 -2 truefalse
Answers
False; all of the columns for the element oxygen are accurately filled out in the following table. (Beryllium is used as an illustration.) The element's atom's electron arrangement predicts the ion charge beryllium One and two oxygen atoms 1s 2 , 2s 2 , 2p 4 , 3s 2 -2
A chemical element with the atomic number 4 and the symbol Be is known as beryllium. It is an alkaline earth metal that is steel-gray in color, tough, light, and brittle. It is a divalent element that only naturally occurs in minerals when combined with other elements. Beryl and chrysoberyl are well-known gemstones that contain a lot of berylliums.
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Find the mass of 2.00 mols of Helium atoms
Answers
Answer:
8.005204 gm
Explanation:
From periodic chart ,
mass of one mole of Helium atoms = 4.002602 gm/mole
two moles is twice this weight
help plss——————
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Answers
Y = 2.7
Z = 2.8.2
the answer is Z because Z is from group 2 which is an alkaline earth metals element
Chemical substances that carry messages directly from one neuron to the next are called:
(a) agonists. (b) neurotransmitters. (c) enzymes. (d) hormones.
Answers
Chemical substances that carry messages directly from one neuron to the next are called "Neurotransmitters." These chemical substances are important to our body.
What are Neurotransmitters?Neurotransmitters are one of the body’s chemical substances. Neurotransmitters directly transmit messages from one nerve cell to the following neuron, muscle, or gland cell across a distance. The axon terminal, a component of the neuron, is where neurotransmitters are located. They are kept inside synaptic vesicles, which have thin walls. Numerous thousands of neurotransmitter molecules can fit inside each vesicle.
As a message or signal moves along a nerve cell, the electrical charge of the signal provokes neurotransmitter vesicles to fuse with the nerve cell membrane at the cell's very edge. The axon terminal is then distributed into a liquid area between one nerve cell and the next target cell.
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City A in the Southern Hemisphere and City B in the Northern Hemisphere are located at the same latitude. Which statement is likely true about these
cities?
City B has the larger annual temperature range.
Both cities should have nearly identical winter temperatures.
City A has the larger annual temperature range.
Both cities likely have the same annual temperature range.
Answers
Answer:
City B has the larger annual temperature range
Explanation:
This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.
Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.
What is the title with a "salt" compound?
Answers
Answer:
Sodium chloride, I think
Explanation:
Salt's compound name is sodium chloride
what is the product after the chemical reaction
Answers
Answer: a. 2 C3H7OH + 9 O2 → 6 CO2(g) + 8 H2O(g)
b. C6H12O6 + 6 O2 → 6CO2(g) + 6 H2O(g)
Explanation:
Alcohols and sugars combust or when burned with oxygen forms carbon dioxide and water.
What are prevailing windst Give three examples,
Answers
Answer:
Polar easterlies are dry, cold prevailing winds that blow from the east. They emanate from the polar highs, areas of high pressure around the North and South Poles. Polar easterlies flow to low-pressure areas in sub-polar regions. Westerlies. Westerlies are prevailing winds that blow from the west at midlatitudes.
Explanation:
I hope this helps
How much water would I need to add to a 175 mL of a 0.45 M KOH solution to make a 0.2 M solution?
Answers
Answer:
393.75mL
Explanation:
We know that
C1V1= C2V2
where C = centration, V= volume
C1= 0.45 M
V1= 175 mL = 0.175 L
C2 = 0.2M
⇒V2= C1V1/C2
⇒V2 = 0.175×0.45/0.2
=0.39375L
Therefore, amount of water needed= 393.75mL
What charge would an ion have if it had more electrons than protons?
A. It would have a net positive charge.
OB. It would have no charge.
C. It would have a net negative charge.
Ο Ο
D. It would be neutral, since electrons would be outside the nucleus.
Answers
Answer:
it will have a net negative charge and it is known as anion
the half-life of a certain radioactive material is 4 days. the length of time it will take for the material to decay to 17 of its original mass is
Answers
If the half-life of a certain radioactive material is 4 days. the length of time it will take for the material to decay to 17 of its original mass is 11.06 days.
To solve this problem, we can use the formula for exponential decay:
N(t) = N0 * (1/2)²(t/T)
where:
N(t) is the amount of the radioactive material remaining after time t
N0 is the initial amount of the radioactive material
T is the half-life of the radioactive material
We want to find the time it will take for the material to decay to 1/7 of its original mass, which means that N(t) = N0/7.
Using the formula above and plugging in the given values, we get:
N0/7 = N0 * (1/2)²(t/4)
Dividing both sides by N0 and taking the natural logarithm of both sides, we get:
ln(1/7) = ln(1/2)²(t/4)
ln(1/7) = (t/4) * ln(1/2)
t = (4/ln(1/2)) * ln(1/7)
t ≈ 11.06 days
Therefore, it will take approximately 11.06 days for the radioactive material to decay to 1/7 of its original mass, given a half-life of 4 days.
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which statement is true of a chemical reaction? responses energy is not transferred. energy is not transferred. energy is either released or absorbed. energy is either released or absorbed. energy is always absorbed. energy is always absorbed. energy is always released. energy is always released.
Answers
According to the information provided, a chemical reaction results in the release or energy absorbed.
The correct option is B. Energy is either released or absorbed.
What is chemical reaction and example?
Reactants go through a chemical process and turn into product through a chemical reaction in a chemical reaction. For instance, the combination of oxygen and glucose in human breath results in the production of dioxide, water, and energy. A range of sectors benefit from and benefit from the contribution that chemistry makes to their development and growth. They include businesses in the glass, cement, paper, textiles, leather, and dye industries. Chemical is also widely used in sectors like paint, pigments, petroleum, sugar, polymers, and medicines.
Why do chemical reactions occur?
Chemical reactions occur when atoms form or break chemical bonds. The molecules that start a chemical reactions are known as reactants, and the molecules that are produced as a result of a reaction are known as products.
Therefore, the correct answer about chemical reaction is that in chemical reactions, energy is either released or absorbed.
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The peptide bond between which two amino acid residues is cleaved by hiv protease?
Answers
The peptide bond between which two amino acid residues is cleaved by HIV protease will be "Phenylalanine Proline".
Whenever the carboxyl group with one molecule combines at all with the amino group of the other molecule, a molecule of water is released, and a peptide bond is created among the two molecules (\(H_{2} O\))
The HIV protease breaks down large precursor proteins towards smaller ones. A new HIV virus is created when these smaller proteins interact with both the genetic material of HIV. HIV cannot replicate when protease is blocked by protease inhibitors (PIs).
HIV protease breaks down freshly created polyproteins specifically, Gag as well as Gag-Pol at nine cleavage sites to produce the mature protein components of such an HIV virion, the infectious version of the virus beyond the host cell. HIV virions do not spread disease in the absence of an efficient HIV protease.
Therefore, the peptide bond between which two amino acid residues is cleaved by HIV protease will be "Phenylalanine Proline".
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Student added a strip of aluminium metal in aqueous copper(2)Sulfate but no reaction occured. Suggest a reason why.
Answers
Answer:
See Explanation
Explanation:
It is a common observation that a strip of aluminium metal in aqueous copper(II)Sulfate does not show any visible reaction. Aluminium is normally expected to displace copper in solution since it is higher than copper in the electrochemical series.
The reason for this is that aluminium forms an oxide film around its surface which prevents reaction with aqueous copper(II)Sulfate. This oxides film protects the aluminium surface such that it is now unable to react with the aqueous copper(II)Sulfate