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1.) Chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution. 2.)  You will need to use 0.12 L of 1.50 M solution to make 2.40 L of 0.0750 M solution. 3.) Solution has a molality of 0.00229 mol/kg.

Molality is defined as a measure of number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.

1.) As, mass = moles x molar mass

Molar mass of KMnO4 is 158.03 g/mol

So, mass = 0.50 mol x 158.03 g/mol = 79.02 g

Therefore, the chemist needs 79.02 g of KMnO4 to make 4.00 L of a 0.50 M solution.

2.)As , C1V1 = C2V2

Here C1 is initial concentration, V1 is initial volume, C2 is final concentration and V2 is the final volume.

1.50 M x V1 = 0.0750 M x 2.40 L

Now, V1 = (0.0750 M x 2.40 L) / 1.50 M

So, V1 = 0.12 L

You will need to use 0.12 L of the 1.50 M solution to make 2.40 L of the 0.0750 M solution.

3.) Formula for molality is: m = (moles of solute) / (kg of solvent)

As, moles = (mass of solute) / (molar mass of solute)

= (20 g) / (58.44 g/mol) = 0.344 mol

m = (0.344 mol) / (150 g / 1000 g/kg) = 0.00229 mol/kg

So, the solution has a molality of 0.00229 mol/kg.

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The location in atom : In the nucleus

The Charge : + 1 elementary charge

The Approximate Mass = 1.0073 amu

The nucleus of an atom contains the protons, electrons and the neutrons. The Protons are the positively charged species, the electrons are negatively charged species and the neutrons have no charge means it is neutral. For the neutral atom the number of the protons is equals to the number of the electrons. The approximate mass of the proton is 1.0073 amu.

Thus, The Protons location is inside nucleus of an atom , the proton has the elementary charge of + 1.  The approx mass is the 1.0073 amu.

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The quantum numbers for the very last electron in Cadmium (Cd) atom is  (5, 0, 0, ±¹/₂) for the four quantum numbers.

Quantum numbers are the set of numbers used to express the location and energy of an electron in an atom.

There are four quantum numbers used to describe the location and energy of an electron in an atom, and they are:

The electronic configuration of cadmium is  [Kr]4d¹⁰5s².

Hence, cadmium belongs to period 5 of the periodic table, and the last electron occupies the 5s orbital.

The l value of the s orbital is 0, and mi is 0 as well.

The value of ms is ±¹/₂.

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Giving the right relative importance of the bases and acids used in the reaction is H2PO4 > H2BO3 and HBO32 > HPO42.

A chemical that produces salts and release hydronium ions into water when it reacts with any of these metals. Acids have one sour taste and give some colours a reddish tint. Chemicals taste acidic whenever dissolved in water and conduct electricity, and combine with metals to produce oxygen and hydrogen. Litmus is one indicator compound that can be used to identify acids. Acids cause the blue litmus material to turn red. One type of acid is sodium hydroxide.

For example, pure sulfuric acid has a shocking pH of -12 while nitric acid has a pH of 1.08 and bleach has a pH of 1.6. So, the strongest "regular" acid you will encounter is weakly acidic.

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A chemical reaction is a process in which a covalent or ionic bond is broken or formed.

A chemical reaction is a process that converts one or more compounds, known as reactants, to one or more distinct substances, known as products. Chemical elements or compounds are examples of substances.

A chemical reaction equation specifies the reactants and products, whereas a balanced chemical reaction equation specifies the reactants and products' mole relationships. The quantity of energy involved in the reaction is frequently mentioned. Reaction stoichiometry is the study of the quantitative aspects of chemical processes.

Synthesis (anabolic), decomposition (catabolic), and exchange are the t

Three primary types of chemical reactions involved in human physiology.

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Answer:

Explanation:

The atomic mass of the nitrogen atom is 14

Answer:

Beer's law (sometimes called the Beer-Lambert law) states that the absorbance is proportional to the path length, b, through the sample and the concentration of the absorbing species, c: A α b · c. The proportionality constant is sometimes given the symbol a, giving Beer's law an alphabetic look: A = a · b · c.

Explanation:

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In this case, multiplying 0.35 by 55 gives us the number 19. 25.2 m squared plus three squares is a match. This is equivalent to the third square of 20 by 25.4.

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The reaction stops because the reaction is a decomposition reaction.

We have to note that there is a reaction when there is change of the reactants that are in the system to the products. We have to note that in this case. we have the decomposition of the mercury oxide.

Since it is a decomposition reaction, we can see that there is a break down of the mercury oxide to give rise to the oxygen and to the mercury as such if we remove the mercury oxide the reaction stops.

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The reactivity of the elements in group 2 would increase down the group.

We have to note that when we are talking about the reactivity of the elements we are looking at how easiliy the elements are able to engage in the process of chemical combination.

For the group two elements, they are highly reactive but not as reactive as the elements that we can find in group 1. The reactivity of the element is that are in group 2 would increase as we move down the group of the elements.

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The chemical compound Barium Carbonate (BaCO3) is composed of one Barium atom (Ba), one Carbon atom (C) and three Oxygen atoms (O3). Therefore, the number of carbon atoms in Barium Carbonate is 1.

The compound Barium Carbonate has 1 carbon atom.

The chemical formula for Barium Carbonate is BaCO3, which means it contains 1 atom of Barium (Ba), 1 atom of Carbon (C), and 3 atoms of Oxygen (O). Therefore, the compound Barium Carbonate has 1 carbon atom.

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Answer:

64.2 L

Explanation:

In order to be able to calculate the volume of oxygen gas produced by this reaction, you need to know the conditions for pressure and temperature.

Since no mention of those conditions was made, I'll assume that the reaction takes place at STP, Standard Temperature, and Pressure.

Under these conditions for pressure and temperature, one mole of any ideal gas occupies 22.7 L

- this is known as the molar volume of a gas at STP.

So, in order to find the volume of oxygen gas at STP, you need to know how many moles of oxygen are produced by this reaction.

The balanced chemical equation for this decomposition reaction looks like this:

2KClO3(s] −−−→2KCl(s]+3O2(g]↑

Notice that you have a 2/3 mole ratio between potassium chlorate and oxygen gas. This tells you that the reaction will always produce 3/2 times more moles of oxygen gas than the number of moles of potassium chlorate that underwent decomposition.

Use potassium chlorate's molar mass to determine how many moles you have in that 231-g sample.

231g ⋅ 1 mole KClO3/ 122.55g = 1.885 moles KClO3

Use the aforementioned mole ratio to determine how many moles of oxygen would be produced from this many moles of potassium chlorate

1.885 moles KClO3 ⋅ 3 moles O2/2 moles KClO3 = 2.8275 moles O2

So, what volume would this many moles occupy at STP?

2.8275 moles ⋅ 22.7 L/ 1mol = 64.2 L

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Explanation:

The statement that best explains the observations in the table is - the water molecules of sample 1 are moving faster.

The temperature has an influence on the molecules of water. An increase in temperature is can make the water molecules to have more energy and therefore move at a faster rate.

When this happens the water molecules are said to move far apart and there will be an increase in the volume of water.

When water is heated, it has the tendency to expand and increase in volume, thereby becoming less dense.

The food coloring will spread into the water molecules by the phenomenon of diffusion. In hot water, food coloring will diffuse faster.

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C. Pipet Analytical balance,It is expected that the accuracy of the following equipment will be examined depending on the equipment listed: Thermometer Graduated Cylinder Thermometer Buret C.

Pipet Analytical balance, part E These tools are frequently used in scientific experiments to measure volume, temperature, and weight. It's also crucial to understand the difference between accuracy and precision. While precision refers to the reproducibility of a series of measurements, accuracy relates to how near a measurement is to the real value of the quantity being measured.While 10 ml graduated cylinders feature marks every tenth of a milliliter, most 50 ml graduated cylinders have markings spaced every milliliter. Our measurement should be more precise if we use a 10 ml graduated container than if we use a 50 ml graduated container. We refer to an instrument as being ACCURATE if it produces values that are extremely near to the genuine value. Example: The same sample was measured three times using a graduated cylinder, yielding readings of 566 mL, 584 mL, and 541 mL. These three figures add out to 563.7 mL on average.

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Answer:

58.44277 gram

Explanation:

Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds found in the former are typically much stronger attractions than ordinary dipole moments in the latter.

This is referred to as the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds have a stronger attraction which  makes it more difficult for the atoms to be broken down hence the reason why the boiling point will be higher in this scenario.

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The number of moles which are in 559 grams of Mg(CIO3)2 is 2.92mol.

This is referred to as the unit of the quantity amount of substance  and is also defined as a measure of how many elementary entities of a given substance are in an object or sample.

The formula is mole = mass/molar mass.

Mg(CIO3)2 has a molar mass of 191.20g/mol

Mole = 599/191.20 = 2.92mol.

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The way the bonds are built will determine how they are oriented. Additionally, the relative orientation of bonds affects conformation. Dibromocyclohexane is used to study the conformation.

Having a few very notable exceptions, the general rule is that molecules with at least one stereocenter are chiral, while molecules with no stereocenters are achiral. In most circumstances, an easiest approach to determine whether a molecule is chiral or achiral is to seek for one or even more stereocenters.

Two substituent groups inside the same plane are regarded to be the cis isomer of cyclohexane (either equatorial or axial). Cis-1-methyl-4-hydroxymethyl cyclohexane is cyclohexane with a methyl group in the axial plane (-CH3)also the hydroxyl group (-OH).

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The formula for iron(II) phosphide is Fe₂P.

This is a term used in chemistry which is used to identify each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element.

In this scenario, the chemical compound of iron and phosphorus, with a formula of Fe₂P and it has a physical appearance is grey, hexagonal needles which is formed from the reaction between the elements Iron and phosphorus at an elevated or high temperature and the product which is formed is a phosphorylated molecule thereby making it the most correct choice.

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The volume of the gold sample, given the theoretical density and the mass, is 1.23 ml

When given the theoretical density of a gold sample and the mass, you can use the formula for density to find the volume of the gold sample.

The volume for density is:

Density = Mass / Volume

Mass = 23. 82 g

Density = 19. 30 g / ml

The volume is:

19.30 = 23 .82 / Volume

Volume x 19. 30 = 23. 82

Volume = 23. 82 / 19. 30

= 1.23 ml

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The full question is:

A sample of gold has a mass of 23.82 g, given that the theoretical density is 19.30 g/ml, what is the volume of the gold sample?

There are three chemically non-equivalent hydrogens present in 3-chlorocyclopentene.

Non-equivalent hydrogens are groups which have the property of  distinctive synthetic movements. We will find the same number of signs in an NMR spectrum along its lines due to the non-equivalent hydrogens.

These non-equivalent hydrogens can be determined by finding out whether a molecule is symmetric or not at first.

In the molecular structure of 3-chlorocyclopentene, chlorine is attached to the third position of the cyclopentene ring. There are four hydrogen atoms attached to the cyclopentene ring, and out of these four  hydrogen atoms, three hydrogen atoms have different environments, so there are three chemically non-equivalent hydrogens in its structure.

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The question about compounds that is most likely to be answered by the analysis is a) what is the formula unit of each compound?

The elemental analysis of two different ionic compounds, both of which contain only copper and chlorine, can be used to determine the formula unit of each compound.

An ionic compound is a type of chemical bond formed by the attraction between ions with opposite charges. In this case, the two different ionic compounds, which are powders, one white and one brown, contain only copper and chlorine ions.

The elemental analysis will help to determine the ratio between the copper and chlorine ions in the compound, which in turn will give the formula unit for each compound.

By conducting an elemental analysis on the two powders, one can answer the question of what the formula unit of each compound is. Hence, option a is correct.

This is because an elemental analysis can determine the elements present in a given compound, as well as the ratio between them. Knowing the elements present in a compound and their ratio allows us to determine the formula unit of the compound.

Although a part of your question is missing, you might be referring to this question:

Two different ionic compounds each contain only copper and chlorine. both compounds are powders, one white and one brown. An elemental analysis is performed on each powder. Which of the following questions about the compounds is most likely to be answered by the results of the analysis?

a) what is the formula unit of each compound?

b) what is the molecular mass of each compound?

c) What is ratio or each compound?

d) none of the above

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The concentration of the acid (the analyte) is determined using the formula below:

Titration is a method of quantitative chemical analysis used to determine the concentration of an unknown substance known as the analyte.

Titrants are created as standard solutions with established concentrations and volumes as reagents. To ascertain the concentration of an analyte, the titrant reacts with an analyte solution. The titration volume is the amount of titrant that interacted with the analyte.

The concentration of the acid (the analyte) is determined using the formula given below as follows:

Ca =  * Cb * Vb / 2* Va

where;

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The density of the iron plate in g/cm³, given that it has a mass of 25.0 Kg and a volume of 3180 cm³ is 7.86 g/cm³

The density of a material is defined as the mass of the material per unit volume of the material. This is written as:

Density = mass / volume

Using the above formula, we can obtain the density of the iron plate as illustrated below:

Density = mass / volume

Density of iron plate = 25000 / 3180

Density of iron plate = 7.86 g/cm³

Thus, from the above calculation, we can conclude that the density of the iron plate is 7.86 g/cm³

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Ascorbic acid will not interfere with the reagent strip test for leukocytes.

Ascorbic acid, often known as vitamin C, is an organic molecule that occurs naturally. It is a water-soluble vitamin that is necessary for the immune system to operate properly, for the skin to produce collagen, and for the body to absorb iron.

Because ascorbic acid cannot be detected by the test. Leukocyte reagent strip tests often involve the use of a particular chemical reagent, such as nitrofurantoin or esculin, which reacts with the enzymes contained in leukocytes to generate a noticeable color shift.

Ascorbic acid does not react with the reagent used in the test because it does not share the same chemical characteristics as leukocytes.

Which of the following factors will not interfere with the reagent strip test for leukocytes?

A) ascorbic acid

B) formaldehyde

C) nitrite

D) urinary protein level of 500 mg/dL

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The four quantum numbers that identify the highest energy electron in a francium, fr, atomic orbital are n, ℓ, m, and s.

The energy levels of an atom are connected by a set of quantum numbers. The entire and singular quantum state of a single electron in an atom, also known as its wave function or orbital, is described and explained by the four quantum numbers, n, l, m, and s. Accordingly, the four quantum numbers are n, l, m, and s.

The quantum number is used to define the location of electrons, and an orbital is a place inside the atom where an electron can be found. The quantum number of the shell orbitals of an atom depends on the number of electron shells it contains.

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Because it takes no energy to generate a naturally occurring compound, the enthalpy of formation for an element in its elemental state will always be 0.

The free energy shift that happens when 1 mole of a material is created from its component elements in their standard states is referred to as the standard free energy of formation. The standard free energy of production of a pure element in its standard state is zero.

The distinction between Gibbs free energy and standard free energy is that the former is dependent on the experimental circumstances, whilst the latter describes the Gibbs free energy for reactants and products in their standard state.

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Reduction is an activity to reduce something. In chemistry there is also a reduction reaction that is related to the oxygen content of a substance.

When a reduction reaction occurs, the substance will experience an increase in electrons, making it more negative. The following are examples of reduction reactions that occur in everyday life:

In the extraction of iron oxide (iron ore) is reduced to remove the oxygen in it. This is done to obtain pure iron (Fe) with the help of carbon monoxide (CO) as a reducing agent.

Copper purification reaction using a voltaic cell. Where Cu2+ ions will undergo a reduction reaction with a reducing agent in the form of magnesium to produce a precipitate of pure copper (Cu). From the reaction it can be seen that Cu has increased by 2 electrons so that its charge becomes neutral.

According to Chemical Equations, this reaction is a reaction between magnesium (Mg) powder and black copper (II) oxide (CuO) powder to produce pure copper (Cu) and white magnesium oxide (MgO) powder.

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