It is important for the findings of studies into the effects of radiation on humans to be published and shared with other scientists so that the findings can be checked by peer __________. What is the missing word in this sentence?

Answer:

it was stable because of it was in Potential energy and unstable because it was in kinetic energy or vice Versa. im somehow confused

1. The chemical analysis for determining the iron concentration of iron supplements is a redox titration.

2. One disadvantage of the redox titration method is the requirement for precise technique and careful handling.

3. The concentration of the tablet is 0.465% Fe2+ and falls under the permissible limits.

1. Chemical analysis for determining the iron concentration of iron supplements:

The chemical analysis for determining the iron concentration of iron supplements is a redox titration.

The redox titration is a type of titration that involves the oxidation-reduction reaction between the analyte and titrant.

In this case, the analyte is iron, and the titrant is potassium permanganate (KMnO4).

The procedure for performing the chemical analysis is as follows:

Firstly, the iron supplement is dissolved in deionized water, and then it is acidified using sulfuric acid.

The acidified solution is then titrated against a standard solution of potassium permanganate (KMnO4) of known concentration until the endpoint is reached.

The endpoint is the point at which the purple color of KMnO4 persists for about 30 seconds. The balanced redox equation for the reaction is:

5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O.

The iron concentration of the iron supplement is calculated using the formula:

iron concentration (mg/g) = (volume of KMnO4 × molarity of KMnO4 × molecular weight of iron × 10^3) / weight of the sample.

The molecular weight of iron is 55.85 g/mol.

The weight of the sample is known (200 mg).

The volume of KMnO4 (16.70 mL) and its molarity (0.005 M) are also known. Using these values, the iron concentration (mg/g) can be calculated as follows:iron concentration (mg/g) = (16.70 mL × 0.005 M × 55.85 g/mol × 10^3) / 200 mg= 23.06 mg/g

Therefore, the iron concentration of the iron supplement is 23.06 mg/g.

2. Disadvantages of the chemical analysis:

The disadvantages of the redox titration for determining the iron concentration of iron supplements are as follows:

It is an expensive and time-consuming method because of the requirement of the use of expensive reagents such as potassium permanganate.

The method requires a high degree of accuracy in the preparation of the reagents and the standardization of the titrant.

The method requires the use of a large number of samples, which can lead to the accumulation of errors during the analysis.

The method is sensitive to interference from other compounds present in the sample, which can affect the accuracy of the results.

The method is not suitable for determining low concentrations of iron in the sample because of the high detection limit of the titrant.

3. To calculate the mass percentage of iron (II) in the 200-mg iron (II) tablets, we first determine the moles of iron (II) in the 25 mL solution using the volume and molarity of the KMnO4 solution:

0.005 M KMnO4 × 0.0167 L = 8.35 × 10^-5 moles KMnO4

From the balanced equation, we know that 1 mole of KMnO4 reacts with 5 moles of Fe2+. Therefore, the moles of Fe2+ in the solution are:

(8.35 × 10^-5 moles KMnO4) / 5 = 1.67 × 10^-5 moles Fe2+

The mass of Fe2+ can be calculated using the molar mass of iron:

(1.67 × 10^-5 moles Fe2+) × (55.85 g/mol) = 0.93 mg Fe2+

The mass percentage of Fe2+ in the 200-mg iron (II) tablets is:

(0.93 mg Fe2+ / 200 mg tablet) × 100% = 0.465% Fe2+

Comparing this result with the reported mass percentage of 100 mg/g, we find that the tested iron (II) concentration falls within the permissible range of variation of +25% since 0.465% is within the range of 0.75% to 1.25% (25% deviation from 1%).

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Answer:

salad is a mixture this is the answer of the question

please mark ne has a brainliest

Considering the definition of ideal gas law, the volume of the Krypton gas is 3840 mL.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P×V = n×R×T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.

Now, taking into account this law, and isolating the pressure variable (P), you get:

\(V=\frac{nxRxT}{P}\)

In this case, you know:

Replacing in the ideal gas law:

\(V=\frac{0.119 molesx0.082 \frac{atmL}{moleK}x298K}{0.756579 atm}\)

Solving:

V=3.84 L= 3840 mL (being 1 L=1000 mL)

Finally, the volume of the Krypton gas is 3840 mL.

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The name of this compound using IUPAC rules is  3,4-dimethylhexane.

Option D is correct.

the IUPAC nomenclature of organic chemistry is described as a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry.

Option A, 2,3-diethylbutane, is incorrect because it has a different carbon chain length and different substituent positions.

Option B, 2-ethyl-3-methylpentane, is incorrect because it has a different carbon chain length and one of the substituents is incorrectly placed.

Option C, 3-methyl-4-ethylpentane, is incorrect because it has a different carbon chain length and the substituent positions are reversed.

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Explanation:

you need to show that the reaction is exothermic, that is, it's releasing heat to the surroundings. there are many measurements to show that

•if you touch the tube it should be hot.

•if the heat released is enough to produce a change, in the temperature of x amount of water, you can put the tube in a beaker and a thermometer in contact with the water and the thermometer should show that the temperature of water (surroundings) is rising

•since the reaction releases heat, putting the tube in a beaker with ice should accelerate the reaction. on the contrary, heating the tube should decrease the reaction rate or even stop it completely. use the chronometer app in your phone to measure how long it takes for the bubbles of h2 (product) to appear or how long it takes for the magnesium (reactant) to disappear. you should find out that it takes more time when you're heating the tube and less time when you're cooling the tube .

hope it was helpful!

Answer:

Mass number

Explanation:

All atoms of the same element have the same number of protons, but some may have different numbers of neutrons, which would cause a different mass number

Answer:

The answer is mass number

The electronic configuration for an atom of oxygen is:

1s2 2s2 2p2

The correct options is:

C. This specific electron configuration has one unpaired electron.

Electron configuration can be defined as the specific arrangement of negatively charged electrons in different energy levels around atomic nuclei.

The correct statements about this electron configuration are:

A. The atom of oxygen represented by this configuration will have a charge: This statement is incorrect. The electron configuration provided is for a neutral oxygen atom, which means it has no charge.

B. This specific electron configuration has three unpaired electrons: This statement is incorrect. The 2p subshell contains a total of 4 electrons, which are arranged in 2 orbitals with opposite spins. This means that there are 2 paired electrons and 2 unpaired electrons, not 3.

C. This specific electron configuration has one unpaired electron: This statement is correct. The 2p subshell contains 2 orbitals, each of which can hold a maximum of 2 electrons. Since the 2p subshell contains 4 electrons, there are 2 paired electrons and 2 unpaired electrons, with one unpaired electron in each of the two 2p orbitals.

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Answer:

the answer is 4 because 3 just have d orbitals

Answer

F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.

Explanation

Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.

In his claim as a pacifist, Alfred Nobel instituted the Nobel price.

The man Alfred Nobel was a chemist born in Sweden in the year 1833. He was known to to into arms deals and sought to produce very deadly weapons.

On other hand, Alfred Nobel considered himself as a pacifist, someone who does not justify violence for any reason. He invented explosive devices.

Towards the end of his life, in his claim as a pacifist, he instituted the Nobel price.

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The molecular solid naphthalene had always been the unidentified solid with such a melting point around 78 degrees Celsius.

At normal temperature as well as pressure, an ionic compound would be almost certainly a solid, even though a covalent compound could be a solid, a liquid, or even a gas.

The temperature when a solid can transform into a liquid is known as that of the melting point.

Strong intermolecular interactions have led to greater melting points for some substances, while weakly attractive molecules have lower melting points.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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The concentration of hydroxide ions in pure water at 30°C is 1.01 x 10⁻⁷ M, and the [OH⁻] is 2.39 x 10⁻⁹ M if the pH is 5.78 at 30°C.

The concentration of hydroxide ions in pure water at any temperature can be calculated using the ion-product constant for water, K_w, which is equal to the concentration of hydronium ions times the concentration of hydroxide ions. At 30°C, K_w is equal to 1.47 x 10⁻¹⁴, so the concentration of hydroxide ions in pure water can be found by dividing K_w by the concentration of hydronium ions, which is also 1.47 x 10⁻¹⁴. This results in a concentration of 1.01 x 10⁻⁷ M.

If the pH of a solution is known, the concentration of hydronium ions can be calculated using the equation pH = -log[H⁺]. Once the concentration of hydronium ions is known, the concentration of hydroxide ions can be calculated using K_w = [H⁺][OH⁻].

In this case, the pH is 5.78, which corresponds to a hydronium ion concentration of 1.74 x 10⁻⁶ M. Solving for [OH⁻] using K_w and the hydronium ion concentration gives a concentration of 2.39 x 10⁻⁹ M.

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According to the soil texture triangle, if we have 25% silt, 25% clay, and 50% sand, then the soil is Sandy clay loam.

According to soil texture triangle 25% silt, 25% clay and 50% sand having the sandy clay loam structure. This type of soil has the sand as a major content but it also have clay and silt with definite proportion. This soil is used for the purpose of guarding. But this soil cannot hold more amount of water as well as nutrients which requires for the growth of plant.

Hence, the type of the soil is sandy clay loam soil.

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Answer:

Explanation:

Milk, flour, gold

Answer:

Metallic Bonding

Explanation:

Metallic Bonding

In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

H would most likely form a polar covalent bond when bonded to oxygen from the given elements.

A polar covalent bond is one that is created by sharing electrons between two atoms that have different electronegativities. A type of chemical bond known as polar covalent bonding occurs when two atoms share a pair of electrons unequally because of differences in their electro-negativities. These substances are known as polar covalent bond. An illustration of this is the electro-negativities of HCl, which differ from one another.

The chemical element with the atomic number 8 and the letter O is called oxygen. After hydrogen and helium, oxygen is the third most prevalent element in the universe and is the most abundant element on Earth. Two atoms of the element combine to generate dioxygen, an odourless and colourless diatomic gas with the formula O2, at standard pressure and temperature.

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Answer:

²⁵₁₁Na⁺

Explanation:

Details about the atom:

          Number of electrons  = 10 electrons

          Number of neutrons  = 14 neutrons

          Number of protons  = 11 protons

The atomic number of an atom is a good indicator of the type of atom we have been given.

From the subatomic particles, the number of protons is the same as the atomic number.

 Since the number of protons is 11, its atomic number will be 11.

The element with atomic number 11 is sodium, Na.

  To write a complete notation, we also need the mass number;

  Mass number  = number of protons + number of neutrons

  Mass number  = 11 + 14  = 25

 The charge on the atom:

     Charge  = Number of protons  - number of electrons  = 11  - 10  = 1+

The element in isotopic notation is given as;

                  ²⁵₁₁Na⁺

Owing to the arrangement of ions in NaCl, the structure has a high melting point and crystalline structure.

Ionic compounds are know to have a crystalline structure. This is because the ions in the compound are arranged into a crystal lattice. A crystal lattice gives a regular repeating structure of ions in the crystal.

As a result of this order in the crystal, the resultant sodium chloride structure has a high melting point and crystalline structure.

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Answer:

Explanation:

It describes how much heat must be added to a unit of mass of a given substance to raise its temperature by one degree Celsius. ... The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: Q=mcΔT.

Answer:

The formula q=mcΔt explained below

Explanation:

so q represents the amount of heat energy. M is the mass of the object and c is the temperature of the object. Δt also known as delta is the change in temperature. It would be the final temperature minus the original temperature.

From the atomic mass of Sb, 121.76 u, one can conclude that the element antimony has more of isotope Antimony-123.

Explanation:

Antimony is an element that has two stable isotopes:

antimony-121 and antimony-123 with masses of 120.90 u and 122.90 u, respectively. The atomic mass of Sb, 121.76 u, can be used to conclude that antimony has a greater percentage of antimony-123 than antimony-121.

Let's calculate the percentage of antimony-121 and antimony-123 in antimony as follows:

Suppose x is the percentage of antimony-121, and (100 - x) is the percentage of antimony-123 in antimony.

At this point, we can use the average atomic mass of antimony and mass of antimony-121 and antimony-123 to calculate x as follows:

x = ((121.76 u) - (122.90 u) (100 - x)) / (120.90 u - 122.90 u) = (121.76 u - 122.90 u + 122.90 x) / (-2.00 u) = (122.90 x - 1.14 u)  

/-2.00 u Solving for x gives x = 42.7%

Therefore, we can conclude that antimony has more of isotope Antimony-123.

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Answer: 24.32 AMU

Explanation:

See attachment.

Yellow describes the colour of a Co(CN)63- solution. This is due to Co(CN)63-'s comparatively low 6.74 x 10-19 J/ion octahedral crystal field splitting energy (°).

The cobalt ion's electronic configuration is quite near to the ground state configuration, as seen by the low crystal field splitting energy, which also suggests that the ligands have little effect on the d-orbitals of the cobalt ion.

As a result, the cobalt ion's d-orbitals are not considerably impacted by the ligands, and there is a little energy difference between them. Because of its ability to absorb visible light in the yellow part of the spectrum, the cobalt ion gives the solution its yellow hue. Additionally, Co(CN)63- solution's colour can be of the concentration of the solution.

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Answer:

as we know that CaO  +CO2 -------------- CaCO3

and it is given that CaCO3 = 100 grams/1 mole

so first we know that this equation is already balanced ,

according to stoichiometry , CaO = 22.4 litre,

because we know that if one mole of CaCO3 contains 22.4 litre ,

then one mole of CaO will also contain 22.4 litre [volume].

This can be only founded by the help of Stoichiometry.

Explanation:

Answer:

c. 640.51

Explanation:

Given: 2.54 cm = 1 inch weighed 3.88 ounces

1 g = 0.035273 ounces

?   = 3.88 ounces

? = (3.88 x 1) / 0.035273

? = 109.999 = 110 g

110 g = 3.88 ounces

2.54 cm = 110 g

14.79 cm = ?

? = (14.79 x 110) / 2.54

? = 640.51 g

According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.

Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.

It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.

Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces

x  = 3.88 ounces

x= (3.88 x 1) / 0.035273

x = 109.999 = 110 g

110 g = 3.88 ounces

Thus,2.54 cm = 110 g

14.79 cm = x

x= (14.79 x 110) / 2.54

x = 640.51 g

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The oxidation number of the  atom is the number that will represents the total number of the electrons lost or the gained by it.

The oxidation number of the  atom is the number that will represents the total number of the electrons lost or the gained by it. The free element has an oxidation number that is equal to zero. For the monoatomic ions, the oxidation number will always be has the same value as the charge related  to the ion.

The hydrogen atom (H) will exhibits an oxidation state of the +1. The Oxygen has the oxidation of the -2 in most of the compounds. All the alkali metals that have the oxidation state of the +1 in the alkali compounds.

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