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Answer: Group 4 had the best "precision".

Explanation:

This is a bit of a trick question. The concept being tested here is whether you understand the difference between "accuracy" and "precision."

Accuracy is how close you are to the actual answer. In this question, Group 2 is probably the most accurate since their average is near 113 (i.e., 112.5).

However, the question is asking for precision, which is how close your answers are to each other. Think of it as "consistency" (even if you are consistently wrong... at least you are "precise"!). Group 4 is the most precise, because all of their measurements are practically the same: 110, 111, 111, 110 are all basically 110. This is NOT the most accurate, but it IS the most PRECISE. :)

Answer:

Explanation:

Both light and sound can be described in terms of wave forms with physical characteristics like amplitude, wavelength, and timbre. Wavelength and frequency are inversely related so that longer waves have lower frequencies, and shorter waves have higher frequencies.

The abbreviation 0.1 N HCl means normal hydrochloric acid.By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration

By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration of the solution. As precise concentration measurements are necessary for many scientific and industrial applications, it is a crucial stage in chemical analysis. In order to determine the concentration of the unknown solution, the standardisation procedure entails mixing a measured amount of the standard solution with a known quantity of the solution being tested. The primary standard, which is a pure material with a known and steady concentration, is often the standard solution. Standardization is used in many disciplines, including chemistry, biology, and engineering, to assure

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The reagent that would oxidize Zn to Zn^2+ but not Fe to Fe^3+ among the options provided is (e) Br^-.

Br^- (bromide ion) can oxidize zinc (Zn) to zinc(II) ion (Zn^2+) by accepting electrons from Zn. The reaction would proceed as follows:

Zn(s) + 2Br^-(aq) → Zn^2+(aq) + Br2(l or aq)

On the other hand, Fe(II) ions (Fe^2+) can be oxidized to Fe(III) ions (Fe^3+) by bromide ions (Br^-) in a redox reaction:

2Fe^2+(aq) + Br2(l or aq) → 2Fe^3+(aq) + 2Br^-(aq)

Therefore, Br^- would oxidize Zn to Zn^2+ but also oxidize Fe to Fe^3+. Among the options provided, there is no reagent that selectively oxidizes Zn to Zn^2+ without also oxidizing Fe to Fe^3+.

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Chemists use the mole unit to represent 6.022 × 10 23 things, whether the things are atoms of elements or molecules of compounds. This number, called Avogadro's number, is important because this number of atoms or molecules has the same mass in grams as one atom or molecule has in atomic mass units.

hope helpful~

Answer:

B

Explanation:

Molarity measures the strength of a solution. Remember, a solution is made up of two parts: the solvent (which does the dissolving) and the solute (the substance that is dissolved). The more solute there is, the higher the concentrate and therefore the higher the molarity of the solution. Thus B is the answer

Answer:

Explanation:

It is not possible to determine if the two substances obtained from different sources that melt at 148-150 degrees celsius are the same based on just their melting point alone. Melting point is a physical property that is widely used as an indicator of chemical purity and identity, however, it is not a definitive test. Two different compounds can have the same melting point.

Melting point is affected by many factors, such as pressure and impurities, which can cause variations in the melting point of a substance. Additionally, polymorphs (different forms of the same substance) can have different melting points.

In order to determine if the two substances are the same, additional tests such as spectroscopy, chromatography, and chemical analysis would be needed to confirm their chemical identity.

Two substances are not always the same only because they melt at the same temperature (148–150°C). A physical attribute of a material that can be utilised as a distinguishing factor is melting point.

It does not follow that two substances that melt at the same temperature (148–150°C) are the same. The physical feature of melting point can be used to identify a material, but it is not the sole factor in determining chemical identification. To compare two substances, it is necessary to take into consideration additional characteristics including chemical composition, solubility, density, and interactions with other compounds. Additionally, compounds with identical melting points can be found in several chemical families and may have various chemical and physical characteristics. In order to validate the chemical identity of two compounds received from various sources, further investigation, such as infrared spectroscopy, X-ray diffraction, or chromatography, may be required.

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The pair that has both reduced forms of electron carriers is NADH/FADH2. NADH is a reduced form of nicotinamide adenine dinucleotide (NAD+), which becomes reduced when it gains a pair of electrons and a hydrogen ion.

FADH2 is a reduced form of flavin adenine dinucleotide (FAD), which also becomes reduced when it gains a pair of electrons and two hydrogen ions. These reduced forms of electron carriers play important roles in cellular respiration, particularly in the electron transport chain. NADH and FADH2 donate their electrons to the electron transport chain, which then uses them to generate ATP through oxidative phosphorylation.

Overall, the reduction of NAD+ and FAD to their respective reduced forms, NADH and FADH2, is essential for energy production in cells.

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Answer:

because the lighted splint is burnt and the water and carbon dioxide starts to explode

A. Ammonia is the limiting reactant.

B. Theoretical yield of urea is 215.3 kg.

C. Percent yield for the reaction is 86.0%

D. The mass of the excess carbon dioxide left is approximately 54.1 kg.

a) To identify the limiting reactant, we should compare the amount of products formed from each reactant. The chemical equation for the formation of urea \((NH_2CONH_2)\) by combining ammonia \((NH_3)\) and carbon dioxide \((CO_2)\) is as follows:

\(2 NH_3 + CO_2 - > NH_2CONH_2 + H_2O\)

The stoichiometry of the balanced equation indicates that the ratio of ammonia to urea is 2:1.

We can find the number of moles for each reactant using the following masses:

Moles of ammonia = 122.0 kg / 17.03 g/mol = 7.17 mol

Moles of carbon dioxide = 211.4 kg / 44.01 g/mol = 4.80 mol

It takes 14.34 moles of ammonia to react completely with the available carbon dioxide because the ratio of ammonia to urea is 2:1. But the amount of ammonia we have is less than we need - only 7.17 mol. As a result, ammonia is the limiting reactant.

b. Based on the limiting reactant, it is possible to calculate the theoretical yield of urea. We can use the moles of ammonia, which is the limiting reactant, to calculate the moles of urea:

Moles of urea = 7.17 mol / 2 = 3.58 mol

We can determine the theoretical yield of urea using the molar mass of urea (60.06 g/mol) as a starting point:

Theoretical yield of urea = 3.58 mol * 60.06 g/mol = 215.3 kg

C. The actual yield (185.1 kg) is calculated by dividing it by the theoretical yield (215.3 kg), then multiplying the result by 100%.

Percent yield = (185.1 kg / 215.3 kg) * 100% = 86.0%

D. We can calculate the amount of non-limiting reactant that has not reacted yet to determine the excess reactant. Since ammonia is the limiting reactant, we must determine how much excess carbon dioxide there is:

Moles of excess carbon dioxide = Moles of carbon dioxide initially - Moles of carbon dioxide used

= 4.80 mol - (7.17 mol / 2) = 1.23 mol

We can determine the mass of excess carbon dioxide using the molar mass of carbon dioxide (44.01 g/mol):

Excess carbon dioxide = 1.23 mol * 44.01 g/mol = 54.1 kg

Therefore, the mass of the excess carbon dioxide left is approximately 54.1 kg.

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448 K is the final temperature of the water.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Given,

the mass of Na is 23 g

The volume of water = 293 cm3

Mass of water = 293 g

Total solution mass = 23 g + 293 g = 316 g

Specific heat capacity of water = 4.18 J/Kg

The equation relating mass, heat, specific heat capacity and temperature change is:

q = mcΔT

197 kJ = 316 g x 4.18 J/Kg x (\(T_{finals} - T_ {initial}\))

197 kJ = 316 g x 4.18 J/Kg x ( \(T_{finals}\)-298 K)

0.1491429956 x 1000 =  \(T_{finals}\)-298 K

149.1429956 + 298 = \(T_{finals}\)

447.1429956 = \(T_{finals}\)

448 K = \(T_{finals}\)

Hence, 448 K is the final temperature of the water.

A high specific heat capacity means that it can store a large amount of thermal energy for a small change in mass or temperature.

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H and O are in the +1 and -2 oxidation states in H2O H 2 O throughout the aforementioned reaction. In the reactant and product sides of the reaction, oxygen and hydrogen are therefore in the same oxidation state. So, the reaction that is being described is not a redox reaction.

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Answer:

we needa see the equations

Answer:

The correct answer is : 44 dollars.

Explanation:

A quarter is one fourth of a dollar that is the reason it is known as quarter. A quarter is 25 cents or 0.25 dollar in value. If Matthew has 176 quarters in his jar than the value of the total coins would be:

1 quarter = 0.25 dollar

1 quarter = 1/4 dollar.

4 quarter = 1 dollar

then, 176 / 4 = x dollar

 = 44 dollar

Thus, The correct answer is : 44 dollars.

Answer:i don’t know

Explanation:i don’t know

Answer:

false, The nucleus of atoms still move around like crazy, it's just the electrons move more.

Answer:

2 moles NH3 = 1 mole of N2

3 moles of H2 = 1 mole of N2

3 moles of H2 = 2 moles of NH3

Explanation:

The balanced equation for the reaction is given below:

N2 + 3H2 —> 2NH3

From the balanced equation above,

1 mole of N2 reacted with 3 moles of H2 to produce 2 moles of NH3.

Thus, we can say that:

1 mole of N2 = 3 moles of H2

1 mole of N2 = 2 moles of NH3

3 moles of H2 = 2 moles of NH3

Thus, considering the options given above, the right answers to the question are:

2 moles NH3 = 1 mole of N2

3 moles of H2 = 1 mole of N2

3 moles of H2 = 2 moles of NH3

Answer:

3 h2=2nh3

2nh3=1n2

3h2=1n2

Explanation:

Answer:

D: a new substance

Explanation:

Chemical reaction

A change in matter that produces on or more new substances

Answer:

D. A new substance is always a result of a chemical reaction.

Explanation:

In a chemical reaction, one or more reactants reacts/decomposes to form one or more products.

The pressure inside a container of gas increases if more gas is added to the container due to the increase in the number of molecules striking the walls of the container per unit time and the increase in the force of the collisions between the molecules and the walls of the container.

Pressure is defined as force per unit area and is usually measured in atmospheres (atm), millimeters of mercury (mmHg), or kilopascals (kPa).The molecules of gas in a container are in constant motion and collide with the walls of the container. When more gas is added to the container, the molecules have less space to move around and collide with the walls more frequently.

This leads to an increase in the number of collisions per unit time and therefore an increase in the force per unit area exerted on the walls of the container. This increase in force leads to an increase in pressure inside the container.In summary, the pressure inside a container of gas increases if more gas is added to the container due to an increase in the number of collisions and the force of the collisions between the molecules and the walls of the container.

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In a solution of nitric acid, the only particles present will be nitric acid molecules. This solution consists primarily of undissociated nitric acid molecules.

Nitric acid (HNO3) is a strong acid. In a solution of nitric acid, the acid molecules dissociate completely into ions. However, it is important to note that in the absence of other substances or impurities, nitric acid will primarily exist as HNO3 molecules.

This is because the dissociation of nitric acid is a rapid and reversible process, and the equilibrium is shifted towards the undissociated form in pure nitric acid solutions.

Therefore, in a pure solution of nitric acid, the only particles present will be the nitric acid molecules (HNO3).

A solution of nitric acid consists primarily of nitric acid molecules (HNO3) as it is a strong acid that dissociates almost completely into ions. In the absence of other substances or impurities, the solution will mainly contain undissociated nitric acid molecules.

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Answer:

In order to determine whether the original material was a uniform/pure-looking mixture or a chemical compound broken into two new compounds, the following points must be noted;

1. If the two new materials are separated by physical means without any  chemical change occurring, the original material is a pure-looking mixture, but if a chemical reaction was involved in separating the material, then it is a compound.

2. If the individual properties of properties of the constituents were retained in the original material, the substance is a mixture, but if the properties of the constituents differed entirely from that of the material, then the material is a compound.

3. If the constituents of the material are not present in a fixed ratio, the material is a mixture but if they are present in a fixed ratio, the material is a compound.

Explanation:

When a substance is being separated into its components, the nature of the substance can be determined by the components obtained.

Matter can be classified into pure substances and mixtures.

Pure substances include elements and compounds which have distinct chemical properties, whereas mixture are composed of two or more constituents physically joined together.

In order to determine whether the original material was a uniform/pure-looking mixture or a chemical compound broken into two new compounds, the following points must be noted;

1. If the two new materials are separated by physical means without any  chemical change occurring, the original material is a pure-looking mixture, if the a chemical reaction was involved in separating the material, then it is a compound.

For example, a sugar and water mixture can be easily separated by evaporation and crystallization to obtain sugar and water respectively, but water which is composed of the elements hydrogen and oxygen cannot be separated by any physical means but by means of a chemical reaction, electrolysis.

2. If the individual properties of properties of the constituents were retained in the original material, the substance is a mixture, but if the properties of the constituents differed entirely from that of the material, then the material is a compound.

For example, a pure-looking mixture of sugar and water has the sweet taste of sugar and the liquid properties of water. However, water, a compound composed of hydrogen and oxygen which are gases, is a liquid and gas properties entirely different from either two.

3. If the constituents of the material are not present in a fixed ratio, the material is a mixture but if they are present in a fixed ratio, the material is a compound.

For example, sugar and water can be mixed together in any ratio to produce a sugar solution, but hydrogen and oxygen are always in a fixed ratio of 2:1 in water

Answer:

nunya

Explanation:

business

The concentration of the iodine at equilibrium from the calculation is 5.33 M

The equilibrium constant allows for the prediction of the direction in which a reaction will proceed to establish equilibrium when concentrations or pressures of reactants and products change.

We know that;

       H₂(g) +  \(I_{2}\)(g)     ⇄2HI(g)

I        4           m              0

C      -x          -x              +2x

E      4 - x      m - x         2

It the follows that;

2x = 2

x = 1

Then equilibrium concentration of hydrogen = 3 M

Thus we have that;

4 = 3 * [ \(I_{2}\)]/\(2^2\)

16 = 3 * [ \(I_{2}\)]

[ \(I_{2}\)] = 5.33 M

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Approximately 107.2 grams of oxygen are required to react with 250 grams of iron.

To determine the amount of oxygen required to react with 250 grams of iron, we need to consider the balanced chemical equation for the reaction between iron and oxygen. The balanced equation is:

4 Fe + 3 O2 -> 2 Fe2O3

From the balanced equation, we can see that 4 moles of iron react with 3 moles of oxygen to produce 2 moles of iron(III) oxide (Fe2O3).

To calculate the amount of oxygen needed, we can follow these steps:

Calculate the molar mass of iron (Fe):

Molar mass of Fe = 55.845 g/mol

Calculate the molar mass of oxygen (O2):

Molar mass of O2 = 2 * 16.00 g/mol = 32.00 g/mol

Convert the mass of iron to moles:

Moles of Fe = Mass of Fe / Molar mass of Fe

Moles of Fe = 250 g / 55.845 g/mol

Use the mole ratio from the balanced equation to determine the moles of oxygen:

Moles of O2 = (Moles of Fe * 3) / 4

Convert the moles of oxygen to grams:

Mass of O2 = Moles of O2 * Molar mass of O2

Now let's calculate the values:

Molar mass of Fe = 55.845 g/mol

Molar mass of O2 = 32.00 g/mol

Moles of Fe = 250 g / 55.845 g/mol ≈ 4.47 mol

Moles of O2 = (4.47 mol * 3) / 4 ≈ 3.35 mol

Mass of O2 = 3.35 mol * 32.00 g/mol ≈ 107.2 g

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Answer:

Certain breeds of fish will often clean bigger fish. The cleaner fish gets food, the bigger fish gets a cleaning.

I'm not too sure.

Good luck! <3

Answer:

thank you :')

Explanation:

Answer:

Aw and thank you!

Explanation:

Even though you said I am loved, you are loved very much too! Don't you ever forget that! No matter what happens and how you feel remember that you are loved and mean so much to people. What you said to me means a lot to me! Thank you! YOU ARE LOVED!!

The amino acids Arg, His, and Leu would be eluted from a carboxymethyl column at pH 6 in the following order: Leu, His, Arg.

This is because a carboxymethyl column is a cation exchange column, which means that it binds positively charged ions (cations) and allows negatively charged ions (anions) to pass through. At pH 6, the amino acids Arg, His, and Leu have the following charges:

- Arg: +1
- His: +1
- Leu: 0

Since Leu has no charge, it will not bind to the column and will be eluted first. His and Arg both have a positive charge, but Arg has a stronger positive charge due to its guanidinium group.

Therefore, His will be eluted second, and Arg will be eluted last.

So the order of elution from the carboxymethyl column at pH 6 is: Leu, His, Arg.

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