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? select one: repeat the original experiment with a different solvent system repeat the original experiment with the development chamber jar open repeat the original experiment with larger spots of each compound repeat the original experiment with a mixture of the compounds in a single spot

Answer:

I think 11 yeah.. try that

Explanation:

Answer:

The purpose of a Bohr model is to show the atom(s) as a central nucleus; containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus.

Explanation:

Have a great rest of your day
The one and only,
-Mr. Universe

In 1913 Bohr proposed his model of the atom , it's purpose was to explain how electrons can have stable orbits around the nucleus. It shows electrons orbiting the nucleus of an atom -He found that electrons farther away from the nucleus have more energy, meaning the electrons that are closer to the nucleus have less energy.

For example...(shows  Bromine )

(you can give that gentleman up top brainliest)

Consider a 3-atom molecule a-b-a for which b has a total of only two valence electrons if you assume that b is a group ii metal, then the bond angle for a-b-a is 180 degree

Valence electron is the s and p electron in the outermost shell and electron present in the inner shell are core electron and according to the valence shell electron pair repulsion theory and we that bond angle that an atom has with its neighbor which also called dihedral angle a group II metal has two valence electron there it can form only single bond then b will not have any lone pair and the ones digit in the group number is the number of valence electron and 180 degree bond angle means the atom are connected in straight line called 180 degree bond

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The correct diagram is C as it is the correct electronic configuration for Sodium ion

What is electronic configuration ?

The description of the positions of the electrons around a nucleus is called an electron configuration. As we previously discovered, every neutral atom contains an equal number of protons and electrons. Now, we'll arrange those electrons such that they stand around the nucleus in a way that shows their energy and the nature of the orbital in which they are housed.

Na ( Sodium )

Atomic Number - 11

Electronic Configuration : 2,8,1

Na+ ( Sodium ion)

Electronic Configuration : 2,8

The correct diagram is C as it is the correct electronic configuration for Sodium ion

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The four main components of a modern detergent are builders (50% by weight), surfactants (15%), bleach (7%), and enzymes (2%).

A detergent can be described as a surfactant or a mixture of surfactants with cleansing properties in dilute solutions. These substances are similar to soap but are more soluble in hard water due to the polar sulfonate is less likely than the polar carboxylate of soap to bind ions in hard water.

Builders are water softeners and their anions react with cations to form insoluble compounds which precipitate onto fabrics and washing machines and which are hard to remove.

Surfactants provide absorption and emulsification of soil into the water and also by reducing the surface tension of water to improve wetting.  The main function of bleaches is oxidizable organic stains, which are usually of vegetable origin.

Enzymes are needed to degrade stubborn stains composed of proteins, fats, starch, and cellulose.

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According to the concept of molar mass, mass of water of hydration lost is 90 g/mole and mass of dehydrated salt is 159.68 g/mole as the mass of copper sulfate pentahydrate is 249.68 g/mole.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

Copper sulfate along with water of hydration has mass of 249.68 g/mole.On heating , the mass of water of hydration lost =90 g/mole

∴mass of dehydrated salt=249.68-90=159.68 g/mole.

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Using the balanced reaction equation, we can calculate that the mass of the precipitate will be 1.617 g.

To solve this question, we need to write the balanced reaction equation first:

2 NaF(aq) + BeSO₄(aq) → Na₂SO₄(aq) + BeF₂(s)

We can now see that the precipitate will be beryllium fluoride. We can also see that 1 mol of beryllium sulfate reacts with 2 moles of sodium fluoride. Now we can calculate the number of moles (n) of both reactants using their molarities (c) and volumes (V):

c = n/V ⇒ n = c * V

n(NaF) = c(NaF) * V(NaF)

n(NaF) = 4.988 M * 79.854 mL = 0.3983 mol

n(BeSO₄) = c(BeSO₄) * V(BeSO₄)

n(BeSO₄) = 1.471 M * 23.3760 mL

n(BeSO₄) = 0.03439 mol

We can see that n(NaF) is more than 2 times greater than n(BeSO₄), so NaF is in excess, and BeSO₄ is the limiting reactant. Now we can calculate the number of moles of BeF₂ formed:

1 mol BeSO₄ : 1 mol BeF₂ = 0.03439 mol BeSO₄ : X

X = 0.03439 mol BeF₂

We can now convert the number of moles (n = 0.03439 mol) of BeF₂ into mass (m), using the molar mass of BeF₂ (M = 47.01 g/mol):

n = m/M ⇒ m = n * M

m = 0.03439 mol * 47.01 g/mol

m = 1.617 g

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First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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10 N

Buoyant force is equal to the weight of the displaced fluid; acting in the upward direction.

Answer:We know that when a body is fully or partially submerged in a fluid,its weight is decreased and that amount of decrease is equals to the weight of the fluid displaced by it.

So,this apparent reduction of weight is due to the buoyancy force acting,which is equals to the weight of the fluid displaced by the body.

So,here the buoyancy force acting on the object is

10

N

Explanation:

Density of water is 1g/cc whereas ethanol is 0.79g/cc

So density of ethanol is less than water hence ethanol will float on water

What is density ?

density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, while Earth has a density of 5.51 grammes per cubic centimeter, water has a density of 1 grammes per cubic centimeter. Another way to state density is in kilograms per cubic meter (in meter-kilogram-second or SI units)

Density of water is 1g/cc whereas ethanol is 0.79g/cc

So density of ethanol is less than water hence ethanol will float on water

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Answer:

it's C

Explanation:

the mitochondria makes energy for the cell so without it there's no energy for the cell

Answer:

I think 1.3 moles correct me if I'm wrong

Explanation:

The remaining mass of radioactive elements with 60 years of half-life is 1000 particles.

We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation

N = No(1/2)^(t/t'')

where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.

From the question above, we know that

t'' = 60 years

No = 2000 particles

t = 60 years

Calculate the remaining mass

N = No(1/2)^(t/t'')

N = 2000 x (1 / 2)^(60 / 60)

N = 1000 particles

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The correct answer about Liquids A and B is:

Liquid B has a lower boiling point because more water evaporated, therefore the interactions between the particles in Liquid B are weaker than the interactions in Liquid A; option D

The boiling point of a liquid is the temperature at which the molecules of the liquid change phase from liquid to gas.

At the boiling point of a liquid, the molecules of the liquid acquire enough energy to break free of the intermolecular forces between the molecules.

The lower the boiling point of a liquid, the lesser the strength of the intermolecular forces between the molecules,

Hence liquids with lower boiling points evaporate faster.

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When a chemical reaction happens, the atoms in the reactants are rearranged to create compounds with various chemical characteristics. Although identical atoms are present in both the reactants and the products, sodium chloride was produced by rearranging the atoms in the reactants. The reactants lacked sodium chloride.

Sodium is a soft, silver-colored metal that may be sliced with a knife. With water, pure sodium metal reacts violently (and even explosively), creating sodium hydroxide, hydrogen gas, and heat.

2Na(s)  +  2H₂O(l)  ⟶  2NaOH(aq)  +  H₂(g)

Chlorine is a poisonous yellow-green gas with a pungent smell.

But when sodium and chlorine combine, they create sodium chloride, or table salt, which is known to practically everyone in the world.

2Na(s)  +  Cl₂(g)  ⟶  2NaCl(s)

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Answer:

Atomic emission spectra are produced when excited electrons return to the ground state. When electrons return to a lower energy level, they emit energy in the form of light.

Explanation:

America can best accelerate its transition to renewable energy by :

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To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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The factor that will increase the rate of the function of the enzyme A is increasing the temperature to 70°C (option A).

Enzymes are biological catalysts meaning that they regulate the rate of biochemical reactions in living cells.

Enzymes lower the activation energy of a reaction, which is the required amount of energy needed for a reaction to occur. Enzymes do this by binding to a substrate and holding it in a way that allows the reaction to happen more efficiently.

The factors that affect the rate of function of na enzyme are as follows:

Each enzyme has an optimum pH range. This means that changing the pH outside of this range will slow enzyme activity, however, raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction.

Therefore, the increase of temperature will increase the rate of function of the enzyme A.

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The oxides of 'C' and 'N' are the two molecular compounds having the same mass i.e. CO₂ and N₂O.

To calculate the molecular weight of a molecule, individual atomic masses of various elements are added.

Given: The atomic mass of 'C' = 12u

          The atomic mass of 'N' = 14u

          The atomic mass of 'O' = 16u

∵Molecular weight of CO₂ = 12+16+16 = 44g/mol

The molecular weight of Carbon Dioxide is 44g/mol.

∵Molecular weight of N₂O = 14+14+16 = 44g/mol

The molecular weight of Nitrous Oxide is 44g/mol.

Molecular compounds having the same mass are known as Isobars. Isobaric properties are:

e.g.: Ar and Ca

The hydrologic cycle to be altered because of global warming due to increasing green house effect.

Global warming is the term used to describe the phenomena of a gradual increase in temperature close to the earth's surface. This trend has been noticed during the past century or so. This change has affected the pattern of the earth's climate. Scientists have offered proof that the earth's temperature is gradually rising, even if the concept of global warming is still up for debate.

Global warming has a number of causes that are harmful to people, plants, and animals.

A glass-enclosed structure called a greenhouse is used to grow plants. The sun's beams warm the greenhouse's air and plants. The greenhouse must be warmed in order for the plants to flourish because the heat that is trapped inside is unable to escape. The earth's atmosphere is identical.

The greenhouse gases in the earth's atmosphere absorb the heat throughout this process. Because of this, the earth's surface becomes warmer, which enables life to exist on the planet.

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A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.

It is important to understand racial trends in American Society as it helps in understanding the society better.

A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.

Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.

It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.

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From the equation of Graham's law of diffusion of gases, it would take the same number of moles of Ar(g) 23 minutes to effuse through the same membrane.

The rate of diffusion or effusion of gases is affected by temperature, concentration, pressure, and the molecular weight of the gas.

The gas law that describes how the molecular weight or vapor density of a gas affects the rate of diffusion is Graham's law of diffusion of gases.

Mathematically, Graha's law of diffusion of gases is given below as follows:

R₁ / R₂ = √(M₂ / M₁) or T₁ / T₂ = √(M₁ / M₂)

where;

R₁ is the rate of diffusion of gas 1

T₁ is the time of diffusion of gas 1

M₁ is the molecular weight of gas 1

R₂ is the rate of diffusion of gas 2

T₂ is the time of diffusion of gas 2

M₂ is the molecular weight of gas 2

Substituting the values in the second equation:

The molecular weight of Br₂ = 160 g/mol

The molecular weight of Ar = 40 g/mol

46 / T₂ = √(160 / 40)

T₂= 46 / 2

T₂ = 23 mins

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Answer:

1 ) They are wealthy in gases hydrogen and helium. 2 ) They are very hot and dense . 3 ) They have a solid gravitational pull.

Explanation:

Space where huge size of gaseous and dust cloud is present is called nebula. It is mainly made of hydrogen and helium. Nebula exist in the space which is between the stars and it is call as interstellar space.

Helix nebula is closest nebula which is near the earth. It’s distance from earth is about 700 light years.

Dark nebulae are very dense as well as cold. Nebula can be divided into dark nebula and bright nebula. The gas which is present between the stars is always combine with solid grains cosmic dust.

Nebulae contribute more to stellar creation than other areas of the universe for the following three reasons:

So, the correct options are A, D and E.

Huge clouds of gas and dust known as nebulae are found in space and are made up of heavier elements in the form of dust particles as well as ionized gases like hydrogen and helium.

Because the gases and dust within them have the potential to collapse under the influence of gravity and form new celestial objects, they are frequently the birthplace of stars and planetary systems. They are rich in hydrogen and helium. They have a strong gravitational pull and are hot and dense.

Hence, the correct options are A, D and E.

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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe?

The force required to move a body with a mass of 5kg and accelerating at 10m/s² is 50 Newtons.

A force is simply a push or pull of a body resulting from the object's interaction with another object.

From Newton's Second Law, force is expressed as;

F = m × a

Where is mass of object and a is the acceleration

Given the data in the question;

Plug the given values into the equation above and solve for F.

F = m × a

F = 5kg × 10m/s²

F = 50kgm/s²

F = 50N

Therefore, the force of Christian is 50 Newtons.

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The force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.

Force is defined as a push or pull exerted on an object as a result of the interaction of the object with another object.

It can also be defined as an external factor that, when used, alters or has the potential to alter the state of the body.

Force can be expressed as

Force = mass x acceleration

Given, Mass = 5 kg

Acceleration = 10 m/s²

So, F = m x a

F = 5 kg x 10 m/s²

F = 50 kgm/s²

F = 50 Newtons

Thus, the force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.

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XY + Z→ XZ + Y is an example of a substitution reaction. A substitution reaction involves the exchange of one atom for another.

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Answer:

the metal salts are more stable and less reactive than the pure metals

Explanation:

hope this helps

The process of anabolism is a metabolic pathway in which one or more molecules are used to synthesize more complex compounds.

Anabolism refers to the chemical metabolic reactions that occur in biological systems which are aimed at generating complex molecules from simpler ones. This process is different from catabolism, which involves the release of energy to be used in the anabolic process.

Therefore, with this data, we can see that anabolism refers to the generation of complex molecules in biological systems by using the energy generated by catabolic reactions in the body.

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a. The metal known as cobalt forms cobalt III oxide and cobalt II oxide when it react with oxygen.

b. The ionic charge on the metallic copper is +2

When cobalt II oxide reacts with oxygen, it results in the formation of cobalt III oxide.

The balanced chemical equation is given below.

4CoO + O₂ → 2Co2O₃

The ion on metallic is plus 2 charge, it is on this premise that the ionic charge on the metallic copper is confirmed as +2.

So therefore, when cobalt is combines with air, it forms a binary compound known as cobalt II oxide and tricobalt tetroxide.

O₂

Complete question:

a. What compounds does cobalt metal forms?

b. What is the charge on copper ion?

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Answer:

Explanation:Again, this is an example of a physical change. Figure 3.6. 1: Ice melting is a physical change. When liquid water (H2O) freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.03-Sept-2019