A student placed a sample of a food coloring that contains a mixture of a blue dye and a red dye at the top of a chromatography column filled with a nonpolar stationary phase. When water is poured through the column, two bands of colors are seen in the column, as shown in the diagram above.

A student collects a sample of the blue dye from the column in a cuvette. Which of the following is least useful to determine the concentration of the sample using a spectrophotometer set at 640nm?

A. The volume of a sample
B. The path length of the cuvette
C. The absorbance of the dye at 640nm
D. The solar absorptivity of the dye at 640nm

The conditions of the pressure and the temperature where all the phases coexists.

A phase diagram is a diagram that shows the point where all the phases of matter coexists at equilibrium. This phase digram consists of the melting-freezing line, sublimation-deposition line and the

The point where all these lines coexists in equilibrium or intersects is known as the triple point.

he triple point is as marked in the diagram below;

Br2 represents both an element and a molecule.

A molecule is defined as a group of atoms bonded together. An element is defined as a substance that cannot be chemically broken down further into simpler substances. Br2 is only bromine and it is two bromine atoms boned together to form a molecule.

Answer: Chemical energy

Explanation:

Answer:

a

Explanation:

The percent yield of the reaction is calculated as follows:

Percent yield = actual yield/ theoretical yield * 100 %

The percent yield of the reaction is less than 100%.

The percent yield of a reaction is the ratio of the actual yield of a reaction and the theoretical yield of the reaction.

Mathematically:

The percent yield of any reaction is never 100& percent because no reaction actually goes to completion forming exactly all the product that is expected.

Considering the give reaction of the formation of nitric acid in the atmosphere:

The equation of the reaction is:

4 NO (g) + 3 O₂ (g) + 2 H₂0 (g) ---> 4 HNO₃ + excess oxygen.

The percent yield will require the actual yield and the theoretical yield in order to be calculated.

For example, if the actual yield is 12 g and the theoretical yield is 15 g, percent yield = 12/15 * 100%

Percent yield = 80%

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Peter measured the height of a plant five times then the measurements is the least precise is 15.5 cm

Measurement precision is the numerically using measure of imprecision as that standard deviation then calculated from the result by carrying replicate measurement and here given measurements are 15.5 cm, 19.4 cm, 15.6 cm, 15.8 cm, 15.9 cm and in that measurements the least precise are 15.5 cm

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Answer:

I don't know but I do know that you need grammarly.

Explanation:

This sentence is grammatically correct, but its wordy, and hard to read.

The empirical formula of the compound is CH₂O.

The empirical formula of a compound is the simplest formula of a compound showing the elements in the compound combined in their simplest mole ratios.

The empirical formula is determined from the simplest whole number mole ratio in which the elements in the compound combine.

The empirical formula of the compound is calculated below as follows:

mole of carbon = 0.250

mole of hydrogen = 0.50

moles of oxygen = 0.250

Diving by the smallest ratio to convert to whole number ratios

mole ratio of carbon to hydrogen to oxygen will be:

C = 0.25 / 0.25 = 1

H = 0.50 / 0.25 = 2

O = 0.25 / 0.25 = 1

Empirical formula = CH₂O

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The net ionic equation for the reaction between aqueous (NH₄)₃PO₄ and aqueous  Zn(NO₃)₂ to form solid Zn₃(PO₄)₂ and aqueous NH₄NO₃ is:

Net ionic equations are equations that show only the reactant ions that are involved in the formation of a non-ionic product.

In a net ionic equation, the spectator ions or the ions which appear on both sides of the reaction are eliminated.

Considering the given reaction between aqueous (NH₄)₃PO₄ and aqueous  Zn(NO₃)₂ to form solid Zn₃(PO₄)₂ and aqueous NH₄NO₃:

The molecular equation is given below:

(NH₄)₃PO₄ (aq)  + Zn(NO₃)₂ (aq) ----> Zn₃(PO₄)₂ (s)  + NH₄NO₃ (aq)

The net ionic equation is:

PO₄³⁻ (aq)  + Zn²⁺ (aq) ----> Zn₃(PO₄)₂ (s)

The product  Zn₃(PO₄)₂ is insoluble and is obtained as a precipitate.

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The number of plants in the water  is the independent (testing) variable.

Anything that may vary or be altered is considered a variable. In other words, it is any factor in an experiment that may be modified, controlled for, or assessed.

Scientists cannot ascribe changes or discrepancies in outcomes to a single source when more than one variable is altered in an experiment. The outcomes may be directly ascribed to the independent variable by looking at and modifying one variable at a time.

In an experiment, the independent variable is a manipulated variable. It's termed "manipulated" because it can be changed. In other words, you may choose whether to raise or reduce it ahead of time.

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The enthalpy of the reaction when 0.384 g of sodium metal is added to an excess of hydrochloric acid and 3990 J of heat is produced is 266 KJ.

The balanced chemical equation of reaction is -

2 Na(s) + 2 HCl(aq)  ⟶  2 NaCl(aq) + H₂(g)

We know that,

weight of sodium metal is 0.384 g

Molar mass of Na is 23 g/mol

we will calculate the number of moles,

Number of moles = Given mass

                                 Molar mass

Moles of Na =  0.348 g   = 0.015 mol

                        23 g/mol

We will calculate the energy in 1 mole of sodium metal

In 0.015 moles of sodium metal, 3990 J of energy is produced.

so, in 1 mole of sodium metal, 3990 J of energy is produced

                                                  0.015

In 1 mole, 266000 J of energy is produced.

1 J = 0.001 KJ

266000 J = 266 KJ

The enthalpy of the reaction will be 266 KJ.

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Is it possible to predict whether a precipitate will likely be white or a color other than white based on the position of the cation's element in the periodic table then the precipitate is determined by qualitative analysis

Precipitation is the formation of a solid in a solution or inside another solid during a chemical reaction or by diffusion in a solid

Here the composition of relatively complex mixture of metal ion can be determined by using qualitative analysis then in group 1 there are insoluble chlorides in that most metal chloride salt are soluble in water and if no precipitate is form then this cation are not present in significant amount and when white precipitate is formed by the solution of AgNO₃ is added to an acidified unknown solution then white precipitate indicate that presence of Cl⁻ ions whereas all chromates are usually yellow orange or red precipitate

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Answer:

45.2662%

Explanation:

The sum of the chemicals (sodium chloride) and (Baking powder) and (water) is 151.9, The Salt(sodium chloride) is 29.8 grams and as a percent is 0.298%. 151.9x0.298=45.2662%, happy to help any other time!

1. The final temperature is 768 Kelvin.

2. the final pressure is 29.1 atm

Temperature is described as a physical quantity that expresses the hotness of matter or radiation.

We will use the equations of the adiabatic process:

Pressure is described as the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

P11 ^ = P22

P2 = P1 (12)^

1.00 atm = (1/ 0.09)^ 7/5

P2 = 29.1 atm.

2 = 1 (1/2)−1

T2 = = 293 K ( 1 / 0.09)^ (7/5)^−1

T2 = 768 kelvin

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Answer:

Thermal energy

Explanation:

The exhaust from a car that cannot be used is called thermal energy since it's impossible to reuse its energy.

The exhaust from a car contains thermal energy used.  Scientists often refer to thermal energy that cannot be used as waste energy.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.

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The number of moles of silver present in a silver spoon that has a mass of 12.86g is 0.12 moles.

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

The mass of a substance is the quantity of matter which a body contains, irrespective of its bulk or volume.

The mole of a substance is the amount of substance of a system which contains exactly 6.02214076 × 10²³ elementary entities e.g. atoms, molecules.

moles = mass ÷ molar mass

According to this question, silver spoon has a mass of 12.86g. The number of moles can be calculated as follows:

Molar mass of silver (Ag): 107.8682g/mol

moles = 12.86g ÷ 107.8682g/mol

moles = 0.12 moles

Therefore, 0.12 moles of silver are present in the silver spoon.

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The orbital diagram of Mo+6 show the number of paired and unpaired electrons of the ion.

An orbital diagram is defined as the type of diagram that shows the paired and unpaired electrons of an element or an ion.

The given element is known as molybdenum (Mo) with the atomic number of 42.

The ionic molybdenum (Mo+6) contains only 36 electrons as 6 electrons has been donated out.The ion given = Mo+6

The orbital diagram is as follows:

1s²= ¶¶

2s²= ¶¶

2p⁶=¶¶ ¶¶ ¶¶

3s²= ¶¶

3p⁶= ¶¶ ¶¶ ¶¶

3d¹⁰= ¶¶ ¶¶ ¶¶ ¶¶ ¶¶

4s²= ¶¶

4p⁶= ¶¶ ¶¶ ¶¶

The symbol ¶ is used to show the number of electrons in each ground state of the given ion.

In order words, the summary of electronic configuration of Mo+6 =

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶

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The number of molecules contained in a 4.30-g sample of dimethylmercury is 1.12 × 10²² molecules.

The number of molecules of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number as follows:

no of molecules = no of moles × 6.02 × 10²³

According to this question, 4.30-g sample of dimethylmercury (C₂H₆Hg) is given. The molar mass of C₂H₆Hg is 230.659 g/mol.

no of moles of dimethyl mercury = 4.3g ÷ 230.659 g/mol = 0.0186 moles

no of molecules of dimethyl mercury = 0.0186 moles × 6.02 × 10²³

no of molecules = 1.12 × 10²² molecules

Therefore, the number of molecules in 4.3g of C₂H₆Hg is calculated to be 1.12 × 10²² molecules.

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The transformation of inputs into outputs is referred to as the production process.

A production process is a way to use economic resources, such as labor, expensive machinery, or land, to create goods and services for customers.

The transformation of inputs into outputs is referred to as the production process. The primary categories include mass, batch, job, just-in-time, and flexible manufacturing systems.

A production process is a method of delivering goods and services to clients while utilizing resources or economic inputs like labor, expensive machinery, or land.

Therefore, the correct answer is option A. analyze existing resources, such as water availability

The complete question is:

Society decides that it needs to produce more corn to feed the growing population. What must it do before it begins the production process?

A. analyze existing resources, such as water availability

B. determine how people will receive the surplus crops

C. study the profitability of increasing corn production

D. understand who is in a position of authority to produce more

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The most complete list of the parts of the experiment presented in this scenario include:

This refers to the procedures which are performed in other to support or refute a hypothesis. It is also used to ascertain the authenticity of the claim by other people such as scientists etc who review it.

In the scenario given, we were told that the group of identical mice is given the supplement and the other group is not given any thing which means that the control group is the one which wasn't given anything while the ones who were given something is the experimental group.

The dependent variable is the supplement which was given to the mice and is therefore the reason why option B was chosen as the correct choice.

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The electronic configuration of Lithium is 1s²2s¹.

The configuration notation allows scientists to clearly describe and record how electrons are positioned around an atom's nucleus. As a result, it is simpler to comprehend and anticipate how atoms will interact to create chemical bonds.

Lithium is the third element with a total of three electrons. We shall describe the lithium electron configuration with the first two electrons in the 1s orbital. Li's third electron is in the 2s orbital since there can only be two electrons in the 1s orbital. Therefore, Li's electron configuration will be 1s22s1.

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The pH of a solution obtained when 135mL of 0.616 M NaOH is diluted to 16.0 L with water is 2.28.

The pH of a solution is the degree of acidity or alkalinity of a solution.

The pH of a solution can be calculated by using the following equation;

pH = - log {H+}

However, the molarity or concentration of the NaOH solution must first be calculated as follows:

C₁V₁ = C₂V₂

Where;

135 × 0.616 = C × 16000

83.16 = 16000C

C = 0.0052M

pH of NaOH = - log {0.0052}

pH = 2.28

Therefore, the pH of the NaOH solution is 2.28.

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The difference that we can obtain for the calculation of the two step and the one step process is -150 J

In general, the study of heat is what we generally refer to as thermodynamics. Recall that heat has a number of visible effects on a substance such as the increase in the temperature of the substance as well as a change in the state of the substance.

With this in mind, let us try to obtain the heat for the two step process as well as in the one step process as we can see from the question that we have before us just above in this context.

For the first part of the two step process, the heat is obtained from;

q = p dV

q =  2.00 atm (2.95 L - 5.90) = -5.9 atm L or -598 J

For the second step of the two step process

q = 2.5 (2.36 L -  2.95) = -149 J

Total heat for the two step  process =  -598 J + (-149 J) = -747 J

The value of the heat from the one step process is obtained as;

q = 2.5(2.36 L  -  5.90L)

q = -897 J

Difference between q for the two-step process and q for the one-step process in joules;

-897 J - ( -747 J) = -150 J

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The concentration of hydrogen ions [H⁺] ions is 10⁻⁵ and hydroxide ions [OH⁻] ions is 10⁻⁹ in a solution of pH of 5. A) a solution that has a pH of 5 has more hydrogen ions than hydroxide ions.

C)when dealing with pH of 5, you are dealing with acid.

pH = - log [H⁺]

pH is given = 5

therefore,

5 = - log [H⁺]

[H⁺] = 10⁻⁵

now,  [H⁺]   [OH⁻] = 10⁻¹⁴

           10⁻⁵  [OH⁻] = 10⁻¹⁴

             [OH⁻] = 10⁻⁹

A solution that has pH below 7 is acidic solution with higher hydrogen ion concentration.

Thus, The concentration of hydrogen ions [H⁺] ions is 10⁻⁵ and hydroxide ions [OH⁻] ions is 10⁻⁹ in a solution of pH of 5. A) a solution that has a pH of 5 has more hydrogen ions than hydroxide ions.

C)when dealing with pH of 5, you are dealing with acid.

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Step 1 -

A decomposition reaction is a reaction in which a compound is decomposed, i.e., we usually heat a substance thus forming new substances, such as gaseous substances.

Generally speaking, a decomposition reaction will involve only one reactant: the substance to be decomposed.

Step 2 - Examples of decomposition reactions

Let's take a closer look at some examples:

We can already state some conclusions:

a) The products are not always the same. They depend on the reactant. Therefore, they are not always predictable.

b) The reactant can be an ionic compound (such as ZnCO3) but also a covalent compound (such as H2CO3).

c) The reactant does not decompose into its constituent elements.

Step 3 - Finding the wrong answer

Therefore, the only wrong answer is item b), the products are the constituent elements.

Pyrolysis is the most popular recycling method for recovering carbon fiber from composite trash because it essentially burns off the resin at high temperatures.

It has long been asserted that solvolysis, which dissolves the resin using a solvent, offers superior qualities.

The Cycle of Carbon

Plants absorb carbon from the atmosphere.

Animals and plants both absorb carbon.

Animals and vegetation release carbon into the soil.

Living beings release carbon into the atmosphere.

When fuels are burned, carbon is released from fossil fuels into the atmosphere.

Oceans receive carbon from the atmosphere.

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The balanced equation of the reaction could be written as; [tex]HN_{5} O_{3} + Mg ------ > MgO + HNO_{3}[/tex]

We know that in chemistry, the term reaction has to do with the combination of two or more species to give a product. Now the process of the reaction would alter the chemical composition of the reactants as we move on the way to get the ne substances called the products. There would be a breaking down of the bonds that holds the reactant molecules together and then there is a recombination of the atoms in a different way so as to obtain the products of the reaction. This is how a chemical reaction takes place in a given system.

In this case we have the oxidation of the compound called [tex]HN_{5} O_{3}[/tex]. In this case, the compound is actually being oxidized as we can see from the process that would be shown in the reaction equation accurately.

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Based on the image above of Silver from the periodic table, the isotope that would be the most abundant is Ag-107.

Isotopes are atoms of the same element that differ from each other by their mass.

The difference in the mass of isotopes of elements is due to the difference in the number of neutrons in the nucleus.

The relative atomic mass of an element is the sum of the isotopic mass and relative abundances of the isotopes.

The relative atomic mass of an element is closer to the value of the isotope with the greatest relative abundance.

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