Which two steps are in the wrong order for scientific method? Ask a question, make a hypothesis, test hypothesis, draw conclusions, analyze results, communicate results.​

When hydrochloric acid dissolves in water, the hydronium ion is created. Analyzing the developing bond modifications is helpful. Hydrochloric acid is acting as an acid, and water is acting as a base. Take into account the variations in bonding between the raw materials and the finished goods.

The hydronium ion (H3O+) observed in the products was produced by joining one of the oxygen atom's lone pairs to a hydrogen atom. A chloride ion was created as a result of the hydrogen-chlorine bond in HCl being broken and the electrons in this bond turning into a lone pair on the chlorine atom. The overall charge of the reactants is the same as the overall charge of the products.

This demonstrates how the new H-Cl bond is created by joining an electron-poor hydrogen atom of the hydronium ion to a lone pair of electrons from the electron-rich chloride ion. The oxygen-hydrogen link breaks because hydrogen can only make one bond, leaving the electrons of the oxygen atom with a lone pair.

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Mass of NaOH that is required to make the solution is 16 grams

To find out the mass of the Sodium hydroxide that is required to make the solution, we need to know the concentration terms.

The concentration of a substance is the quantity of solute present in a given quantity of solution. Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution

The formula for concentration is given as:

Concentration =     Moles        

                             Vol of Solution

⇒ Number of moles = Volume × Concentration

                 Moles = 0.10 L × 4.0 Mol/L

                           = 0.4 Moles

Mass of NaOH = Number of moles × Molecular weight

                        = 0.4 mol × 40 ⇒ 16 grams

Therefore the mass of NaOH required to make the solution is 16 grams

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Answer:

each element gains one proton as you move from left to right across a period, atomic number is the number of protons

careful not to confuse it with the mass number which is the number of protons and neutrons.

also remember that in any given element, the proton number is always equal to electron number as they have opposite charges that cancel off, this is why elements are neutral.

[tex]P 1 V 1 = P 2 V 2[/tex] ..we get  [tex]V 2 = 6 . L[/tex]  Explanation: [tex]V 2 = P 1 V 1 /P 2[/tex] = [tex]992 X 5.15 /857[/tex] mbar

what is volume and pressure?

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If the TLC plate are left in the chamber for too long after the solvent reached the top the  [tex]R_{f}[/tex] value achieved from experimentation will be different than the expected [tex]R_{f}[/tex] .

The value  [tex]R_{f}[/tex] is the ratio of the distance traveled by the solute to the distance traveled by the solvent. The term comes from chromatography when it was discovered that a particular component in a particular solvent always migrates the same distance under the same conditions.

In chromatography, the value of  [tex]R_{f}[/tex] is the basic requirement of the experiment. It indicates whether the analyte (solute) prefers the stationary or mobile phase. For stationary and mobile phases, the [tex]R_{f}[/tex]  value is used to determine polarity, relative mass, relative solubility, etc.

If the TLC plate is left in the development chamber for too long, solvent will flow to the top of the plate, causing unexpected migration of the chemicals coated on the silica plate. So the experimentally obtained value [tex]R_{f}[/tex] is different from the expected value

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The number of moles of argon gas contained in a 4.00 l container at 1620. kpa and 25.0 °C. if the gas is helium instead of argon, the number mole did not change because number of moles is independent of the type of gas.

given that :

volume of gas = 4.00 L

pressure of gas = 1620 kpa = 15.9 atm

temperature = 273 + 25 = 298 K

R is gas constant = 0.082 L atm K / mol

according to ideal gas equation :

P V = nRT

n = P V / RT

  =  (15.9 × 4 ) / 0.082 × 298

  = 63.6 / 24.4

   = 2.6 mol

it is clear from the above equation the moles is independent of type of gas.

Thus, The number of moles of argon gas contained in a 4.00 l container at 1620. kpa and 25.0 °C. if the gas is helium instead of argon, the number mole did not change because number of moles is independent of the type of gas.

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1) The reaction is as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2)  chlorine is reduced. bromine is oxidizes.

1) In the question is given that : silver acetate combines with potassium chromate to produce potassium acetate and the final product is silver chromate. the reaction is given as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2) When chlorine gas is bubbled through a solution of sodium bromide, a reaction occurs which produces salt (sodium chloride) and bromine gas.

Cl₂   +   2NaBr   ----->   2NaCl    + Br₂

The chlorine oxidation state changes to 0 to -1 . so chlorine is reduced.

The oxidation state of brome is changes from -1 to  . so bromine is oxidizes.

Thus, 1) The reaction is as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2)  chlorine is reduced. bromine is oxidizes.

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The molarity of the acid is given, so the number of moles titrated can be calculated: 0.050 L × 6 mol/L = 0.3 moles of strong acid added thus ...

A strong acid-strong base titration is used to determine the concentration of an acidic solution by titrating it with a known concentration of a basic solution, or vice versa, until neutralisation occurs. Because both the acid and base are strong (high Ka and Kb values), they will fully dissociate, which means that all the molecules of acid or base will separate into ions. Equivalent amounts of H+ and OH- ions combine to form H2O at the equivalence point, resulting in a pH of 7.0. (neutral).

In aqueous solution, an acid that has been completely ionised. In contrast to a weak acid, when a strong acid is placed in a solution such as water, all of the strong acid dissociates into its ions. The general equation for strong acid dissociation is:

HA(aq)→H+(aq)+A−(aq)

The H stands for hydrogen, and the A stands for the acid's conjugate base (anion).

A base that is completely ionized in aqueous solution. This means when the strong base is placed in a solution such as water, all of the strong base will dissociate into its ions. The general equation of the dissociation of a strong base is:

XOH(aq)→X+(aq)+OH−(aq)

The OH represents hydroxide and the X represents the conjugate acid (cation) of the base.

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The evidence in the question shows that there is a directional evolution that is taking place as the percentage of the tall individuals is increasing.

We know that the term natural selection implies that the organisms that are are better able to live and survive in a habitat are the ones that are able to live longer and reproduce and by so doing, they are able to transfer the favorable traits that they posses to their offspring.

Now we can also relate to the fact that the idea of directional selection is takin place when there is a situation in which the trend in the evolution seems to favor only one type of trait over another the other type of trait and this leads to a gradual increase in the abundance of the favored trait in the population.

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The concentration of I- is found to be 1.25 x 10^-3 M when this solution is saturated. The solubility product constant for lead (II) iodide is: Ksp = 1,95 x 10^-9.

The balanced chemical equation of lead (II) iodide is:

PbI2(aq) <=> Pb2+(aq) + 2I-(aq)

   s                     s               2s

We can only include the ions from gas and aqueous phases in the equilibrium equation. Hence, the solubility product constant (Ksp) of this reaction is:

Ksp = [Pb2+][I-]^2

Ksp = s(s)^2

Ksp = s^3

If the concentration of I- is 1.25 x 10^-3:

Ksp = s^3

Ksp = 1.25 x 10^-3 (1.25 x 10^-3)^2

Ksp = 1.25 x 10^-3 (1,56 X 10^-6)

Ksp = 1,95 x 10^-9

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According to the given statement Object B, by 1 gram per cubic centimeter object has a greater density.

The measure of how densely a substance is pressed together is called density. As the weight per unit volume, it meets that definition. The formula for density, denoted by the symbol D, is given as follows: density = m/V, where m denotes the object's mass and V its volume.

Mass and volume are intimately linked with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its densities. The mass is said to have a low population density if it has a high volume but a tiny mass.

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According to stoichiometry and balanced chemical equation 10 iron atoms  react with 30 molecules of chlorine.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important in balancing chemical equations.It is useful in chemical calculations while making solutions of different concentrations.

Two atoms of iron reacts with 6 molecules of chlorine , so  for 30 molecules of chlorine it is, 30×2/6=10 atoms of iron.

Thus, 10 atoms of iron will react with 30 molecules of chlorine.

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The ionic bond between Na and P has formula unit Na3P.

What is the formula unit?

Formula units is the chemical formula which gives all the ions present in the lowest ratio possible to make it neutral charge of an ionic compound. For example, the formula unit for sodium chloride can be written as NaCl where charge on Na is +1 and charge on Cl is -1. So to make it neutral they can be cancelled and written as NaCl.

In sodium phosphide, the charge on Na (sodium) ion is +1 and the charge on the P (phosphorous) ion is -3. Therefore, make the charges neutral, 3 Na ions need to be added to 1 P ion. Formula units can be used to describe or represent the molecules or the elements which make up a substance.

Hence, Na3P is the formula unit of Na and P in sodium phosphide.

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The order of the atomic radius is;  

1) Potassium, Aluminum, Carbon,  Oxygen

2)  Potassium, Aluminum, Carbon, Oxygen

We know that the atomic radius has to do with the distance between one atom and another in that are not covalently combined. We know that the atomic radius is a function of the group to which the atom belongs.

We know that the atomic radius increases down the group but would tend to decrease across the period as more shells are added to the atom of the element.

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Due to same d-same shell, that's why first ionization energy of the transition elements .

Ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.

Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.

In transition elements, the first ionization energy of the elements remain constant because of poor shielding in d-subshell. The electrons suffers repulsion due to which their ionic radii does not decrease on moving from left to right. That's why first ionization energy of the transition elements from Sc to Zn fairly constant until Zn.

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Answer:

Boiling stones should never be added to a hot liquid because that would cause the liquid to boil very fiercely. Now that the distillation is already in progress, first you have to cool down the solution.

Explanation:

When you have forgotten to add boiling stones to your round bottomed distillation flask, but now the distillation is in progress. You should not add boiling stones to the hot liquid, because that can cause that hot liquid to boil fiercely. So, you have to cool down that liquid first and then add boiling stones.

But if you do not add boiling stones in this process, it produces hot spots, which causes splashing out. So, you have to cool down the solution/reaction and then reheat the solution after adding boiling stones.

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Certain types of experiments must begin by heating a crucible to constant mass. The steps in this process are stated below:

Heating a crucible is very crucial to maintain the measurement as thoroughly as possible. The porcelain crucibles are hygroscopic as they absorb weighable moisture from the air. We could get rid of moisture as much as possible by heating it.

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Answer:

Just as the organs in an organ system work together to accomplish their task, so the different organ systems also cooperate to keep the body running. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.

Explanation:

The best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is the best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is fruit juice. sports drinks like Gatorade.

So the correct option is sports drink like Gatorade.

Who are field athletes?

Field athletes include sprinters, distance runners, hurdlers, jumpers, and throwers. The first three compete in races on the track, while the jumpers and throwers make up the field athletes.

In conclusion, some fluids for hydration are best suited for certain events.

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The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.

The axial tilt also called as obliquity. The axial tilt is the angle between the objects rotational axis and its orbital axis  , perpendicular to the orbital plane. The axial tilt is about 23.5 degree. due to this the sun shines on different latitudes with different angle.

Thus, The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.

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Answer:

A: 2 and 4

Explanation:

ttt

A student required 0.40 ml more NaOH than because it will use unstable indicator.

Chemical indicator, any substance which indicates visibly the existence or disappearance of a threshold concentration of such a chemical species, for instance an acid or a caustic in a solution, typically through a color change. One such chemical is methyl yellow, which gives an alkaline liquid a yellow color.

Indicators were weak acids as well as bases which exhibit a colour change when hydrogen ion quantity in a solution varies or as a solution's pH changes. In the water, the indicators gently separate to produce ions. Indicators include things like Litmus, turmeric, phenolphthalein, etc.

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Answer:

The moon reflects the light from the sun

Explanation:

Answer:

it reflects light from the sun

Explanation:

1) Suppose the marble usually rolled right to the end of the box without bouncing off anything, what would this tell you about the size of the targets?

That the target is very small, they do not take up much space in the box. The target represents the gold nuclei in the Rutherford experiment, and thus is relatively small.

2.) What conclusions did Rutherford draw from his data and how did the data change the model of the atom?

A large majority of the alpha particles went through the gold foil, but some got deflected back. At the time, it was presumed that an atom was a sphere with the same charge all around. If some but not all the particles were being reflected back, this meant that the positive charge in the atom must be very concentrated- ie. in the center known as a nucleus. This changed the atomic model from the plum pudding model (negative electrons among large positive sphere) to the nuclear model (Mass of atom is in the nucleus with electrons orbiting around). (As in image below)

3) Niels Bohr was a student of Rutherford, Bohr's work went on to modify the atomic model even more. What changes did Bohr make to advance our understanding of the atom?

Instead of random orbits that Rutherford predicted, Bohr proposed specific atomic orbitals. He explained that there are orbital levels around the nucleus and that this is where electrons are. He said that electrons can move up energy levels by adding energy, and move down by releasing energy. These orbitals are what is shown in the Bohr Model.

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In a Grigmand reaction experiment, all the glass wake washed are complete without water druplet and dried leaving a single aIf it's not dried properly I molecules properly I water Hem aims im tube then this water as am acid the test molecule acts.

We realize Grignard reagents are robust bases one hundred twenty acts as an acid wherein. An or by derivative is a secondary by-product derived from a production system, manufacturing manner, or chemical reaction it is not the primary service or by-derivative being produced. facet products are impurities that appear throughout the response because of aspect reactions that may be opportunity response pathways or similar reactions.

An aspect reaction is a chemical response that occurs at an equal time as the actual foremost response, however to a lesser volume. It results in the formation of. A facet reaction is a reaction that produces a distinct spinoff aside from the preferred derivative. It happens concurrently with the principal reaction but to a lesser extent. for instance, when phenol is reacted with nitric acid the main reaction is the formation of o-nitrophenol.

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Answer:

Fluorine does not form an ion with a charge of 1+.

Carbocation rearrangements can be defined “as the movement of the carbocation from an unstable state to a more stable state by making use of different structural reorganizational shifts within the molecule”. Alkyl carbocation is a carbocation comprising an alkyl group.

Carbocation Rearrangement occurs whenever the alcohols are converted into several carbocations and this phenomenon is termed as carbocation rearrangement. In simple carbocation comprises +ve charge in a molecule that is connected to 3 more groups and holds a sextet. Carbocation rearrangement can be carried out to a reaction that does not involve alcohol. There are 2 types of carbocation rearrangements namely Alkyl and Hybrid Shift.

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The frequency of light with a wavelength of 1.87 x 10-14 m = 1.657*10^-22 Hz

What is frequency of light ?

The frequency is the number of waves that go through a given place in space in a given amount of time, typically one second. It is measured in hertz, which stands for cycles (waves) per second. Color is the frequency of visible light, which spans from 430 trillion hertz for red to 750 trillion hertz for violet.

We must determine the frequency given the wavelength. Where, is the sign for frequency, c is the symbol for the speed of light, and is the symbol for wavelength, the equation that links frequency and wavelength is:

The wavelength is 1.87 x 10-14 m and the speed of light is 3*10^8 m/s

To compute the frequency, let's enter the values in the equation and run the calculations:

f = c/wavelength

f = 3*10^8/ 1.87*10^-14 = 1.657*10^-22 Hz

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Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.

Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.

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In block caving mining, the desired material is located underground, dissolved into a liquid, and then extracted. This is one method of mining sodium chloride, or salt.

Drilling holes beneath the ore body and utilizing designed blasts to disintegrate the ore and rocks are all part of block caving mining. Then, with the aid of gravity, the mixture of rocks and ore is carried for processing. Once the production from open-pit mining becomes unprofitable, block caving mining frequently occurs. Is called block caving mining

Salt Chloride (sodium chloride),  The ratio of the sodium and chloride ions in sodium chloride is exactly one to one. It is frequently referred to as table salt, common salt, or halite (the mineral form of common salt).

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Answer:

(0,1)

Explanation:

Endpoints (-3, 7) and (3,-5)

The midpoints will be the average of the x and y coordinates:

Midpoint for x = (-3+3)/2 = 0

Midpoint for y = (7-5)/2 = 1

(0,1)