Dimensional analysis can only be used for time, distance, mass, speed, volume, and chemical quantities.
Group of answer choices

True

False

Answer:

Because it was based on mystical belief instead of the scientific method (which had not been codified for most of alchemy's existence). It is completely wrong, even if it stumbled on techniques which are still useful.

Explanation:

The half-life of a radioisotope indicates the rate of decay for a radioactive sample (option C).

Half-life is the time required for half the nuclei in a sample of a specific isotope to undergo radioactive decay.

A radioactive isotope is an unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.

The half-life measures the rate at which this decay occurs in the unit of time.

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adenylyl refers to adenosine that is a part of the molecule it changes or acts upon cyclase because it changes a linear group of phosphates into a CAMP form like a cycle.

Stimulation of adenyl cyclase outcomes in formation of cyclic AMP that is launched from the membrane into the cellular and acts inside the cellular to alter a huge sort of mobile processes.

Adenylyl cyclase then plays its catalytic reaction, clipping off phosphates from ATP and forming an extra bond to the ultimate phosphate. The resultant molecule, cyclic AMP or cAMP, is launched and travels fast at some stage in the cellular, regulating the feature of a couple of proteins.

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Also, the conversion informs us that one mole at STP contains 22.4 litres of hydrogen. Hence, 2.93 g of aluminium would completely react at stp to form hydrogen gas, or 22.4 * 2.93 = 65.632.

Alkalis and acids both cause aluminium to react. It creates hydrogen gas and aluminium chloride when it interacts with an acid. It creates hydrogen gas and aluminium hydroxide when it interacts with an alkali.

We are aware that one mole of the any petrol takes up 22.4 litres at STP. This implies that at STP, one mole or hydrogen also takes up 22.4 litres of space. Hence, at STP, 10moles or hydrogen gas will take up =22.410=224litres of space.

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I think the answer is A. I know it's Planet X.

The pH of the solution is determined by the amount of acid or base present in the solution. pH is a measure of the acidity or alkalinity of a solution, with a range of values from 0 to 14. The pH of a solution is equal to the negative logarithm of the hydrogen ion concentration (H+) in the solution

The pH of a solution of 0.080 m trimethylamine and 0.13 m trimethylammonium chloride can be calculated using the following equation:

Kb = [CH3)3N][H2O] / [(CH3)3NH+][OH-]

where Kb is the base dissociation constant of trimethylamine, (CH3)3N. Using the relationship that Kw = Ka × Kb, where Ka is the acid dissociation constant of water (1.0 × 10-14 at 25 °C), the OH- ion concentration of the solution can be found to be 1.23 × 10-5 M. Then, since Kw = [H+][OH-], the H+ ion concentration is found to be 8.12 × 10-10 M. Finally, taking the negative logarithm of the H+ ion concentration gives a pH of 9.09. When a solution is introduced to water, it can either react with the water to form acid or base.

The pH of the solution is determined by the amount of acid or base present in the solution. pH is a measure of the acidity or alkalinity of a solution, with a range of values from 0 to 14. The pH of a solution is equal to the negative logarithm of the hydrogen ion concentration (H+) in the solution. The pH of the solution can be calculated using the pH formula, which is: pH = -log [H+], where [H+] is the concentration of hydrogen ions in the solution. The given solution is composed of 0.080 m trimethylamine and 0.13 m trimethylammonium chloride. Trimethylamine is a weak base and trimethylammonium chloride is its corresponding conjugate acid. When a weak base is added to water, it undergoes a reaction with water to produce hydroxide ions and a conjugate acid.

The base dissociation constant of trimethylamine, Kb is used to find the OH- ion concentration of the solution. The relationship between Kb and Ka is given by Kw = Ka × Kb, where Ka is the acid dissociation constant of water (1.0 × 10-14 at 25 °C).The OH- ion concentration of the solution can be found to be 1.23 × 10-5 M. Then, since Kw = [H+][OH-], the H+ ion concentration is found to be 8.12 × 10-10 M. Finally, taking the negative logarithm of the H+ ion concentration gives a pH of 9.09.

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Answer:

1.24×10^6/6.2×10^-3

200

acc to scientific notation: 0.2×10^3 is the answer

Explanation:

pls mark me as brainlest

Answer:

HI

H2SO4

Explanation:

H2SO4-diprotic acid

Answer:

Well what are the numbers but ik that it ius 5

Explanation:

Answer:

Freezing. When a liquid is cooled, the average energy of the molecules decreases. At some point, the amount of heat removed is great enough that the attractive forces between molecules draw the molecules close together, and the liquid freezes to a solid.

Note how temperature effects the motion of the atoms or molecules in a liquid. As the temperature of a solid, liquid or gas increases, the particles move more rapidly. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

From the question we have

\(V_2 = \frac{P_1V_1}{P_2} \\\)

From the question we have

\(V_2 = \frac{40 \times 20}{80} = \frac{800}{80} = 10 \\ \)

We have the final answer as

hope this helps you

The first step to answer this question is to assume that the given percents are masses.

Then, convert these masses to moles using the corresponding molar mass:

Divide each result by the least result (1.26mol):

Since not all of these are whole numbers, we have to multiply them times 2:

These numbers are the subscripts of each element in the empirical formula.

It means that the empirical formula of this compound is:

So, Na (Z=11) has the largest atomic radius among the given elements in the third period.

The element with the largest atomic radius among the given compounds is Na (Z=11) which is a group 1 element and has only one valence electron, leading to a larger atomic radius compared to the other elements in the third period.

1. List the elements given: Al (Z=13), Na (Z=11), Si (Z=14), and Cl (Z=17).
2. Understand that atomic radius generally decreases across a period from left to right due to an increase in effective nuclear charge.
3. Since Na is the farthest left element among the options provided, it has the largest atomic radius.

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Answer:

Water,

Explanation:

Aquaporins are channels in the membrane that allow water to pass through via osmosis. Aquaporins are unique among the transporters because they are always open. Other channel transporters and carrier transporters open and close, depending on the circumstances.

Answer:

Please mark as Brainliest!!

Explanation:

The former, known as a 'Lewis dot diagram,' indicates a pair of shared electrons between the atomic symbols, while the latter, known as a 'Lewis structure,' uses a dash to indicate the pair of shared electrons that form a covalent bond. More complicated molecules are depicted this way as well.

Answer: Gold Wire

Explanation:

Out of all of these options only gold wire is an element, elements are pure and cannot be broken down by any chemical means

hope it helped, good luck :)

Answer: we'll for sunny days that we'll be high pressure and for low pressure that we'll be cloudy and foggy moist days .

Explanation:

To determine the number of moles of UF6 that would need to be decomposed to produce 1.25 moles of fluorine, we need to look at the balanced chemical equation for the decomposition of UF6.

The balanced equation is:

2 UF6(g) → U2F10(s) + 3 F2(g)

From the balanced equation, we can see that for every 2 moles of UF6, 3 moles of F2 are produced. Therefore, the mole ratio between UF6 and F2 is 2:3.

Since we have 1.25 moles of F2, we can set up the following proportion:

2 moles UF6 / 3 moles F2 = x moles UF6 / 1.25 moles F2

Cross-multiplying and solving for x, we get:

x = (2 moles UF6 / 3 moles F2) * 1.25 moles F2

x = 0.8333 moles UF6

Therefore, approximately 0.8333 moles of UF6 would need to be decomposed to provide 1.25 moles of fluorine.

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A mole of one element contains Same number of atoms as a mole of another element.

The atomic mass of an element, that is found on the periodic table, may be used to determine the amount of moles in a system. Typically, this mass represents the average of the element's abundant forms found on earth. The mass of an element is given as the average of all of its earthly isotopes. The molar mass of a material is the weight of a mole of that substance. In chemistry, the molar mass is frequently used in converting grams of a chemical to moles. The periodic table lists an element's molar mass, which is its atomic weight in grams per mole (g/mol).

The average mass of an element's atoms expressed in atomic mass units is known as its atomic mass (amu, also known as daltons, D). The weight of the each isotope is combined by its abundance to get the atomic mass, which is a weighted average of all the isotopes of that element.

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The question is: Give the systematic name of \(SiF_{2}\).

Answer: The systematic name of \(SiF_{2}\) is silicon difluoride.

Explanation:

The given compound has chemical formula \(SiF_{2}\). It shows that there is one atom of silicon and two atoms of fluorine are present.

So, the number "two" will be represented by the prefix "di" while naming this compound.

Hence, systematic name of this compound is silicon difluoride.

Thus, we can conclude that systematic name of \(SiF_{2}\) is silicon difluoride.

The following chlorides are ionic or covalent:

SiCl₄ = covalent

PCl₃ = covalent

CaCl₂ = ionic

CsCl = ionic

CuCl₂ = ionic

CrCl₃ = ionic

SiCl₄ is silicon tetrachloride. SiCl₄ is a covalent. The bond between silicon and chlorine is formed by the sharing of electrons.

PCl₃ is Phosphorous trichloride . PCl₃ is covalent. Phosphorus contain 5 electrons in valence shell and requires 3 more to complete octet and chlorine require one electron to complete octet so, the bond formed is by sharing of electron.

CaCl₂ is calcium chloride. CaCl₂  is an ionic. calcium is metal and  metal donates electron  to  chlorine is non metal and non metal accept electrons  and become Ca²⁺  and Cl⁻. The bond formed by the transfer of electrons.

CsCl is cesium chloride. CsCl is an ionic. symbol of ions : Cs⁺ and Cl⁻

CuCl₂ is copper(II) chloride. CuCl₂ is ionic formed by the transfer of electrons. symbol of ions : Cu²⁺ and Cl⁻

CrCl₃  is chromium(III) chloride. CrCl₃  is an ionic. symbol of ions : Cr³⁺ and Cl⁻.

Thus, The following chlorides are ionic or covalent:

SiCl₄ = covalent

PCl₃ = covalent

CaCl₂ = ionic

CsCl = ionic

CuCl₂ = ionic

CrCl₃ = ionic

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Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

The given problems are related to isotopes for 1 st solution it is ¹²O isotope with 8 protons and electrons and for ³He there are 1 neutron ,2 electron and mass number is 3.

Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.

Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.

They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable

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(a) Draw resonating structure of PhenolPhenol is a common organic molecule. It consists of a phenyl group (C6H5) attached to a hydroxyl group (OH). The hydroxyl group is connected to the benzene ring at the para position, denoted as p-phenol.

The two main resonating structures of Phenol are shown in the figure below: This reaction takes place by cleaving the double bond of Cyclohexene using ozone, followed by a reductive workup step.

(b) Phenol is heated with CH3COCl:When Phenol is heated with Acetyl Chloride, it forms Acetophenone. The reaction is as follows:Phenol reacts with Acetyl Chloride to form Acetophenone, with the elimination of HCl as a by-product.(c) Propyne reacts with hydrogeniodide in the presence of benzene peroxide:Propyne reacts with hydrogen iodide in the presence of benzene peroxide to form 2-Iodopropane.

The reaction proceeds via a radical mechanism, as shown below:The chain initiation step:This step involves the homolytic cleavage of the benzene peroxide bond to generate benzene and two free radicals. These free radicals then interact with hydrogen iodide to form iodine radicals.The chain propagation step:The chain propagation steps involve the following sequence of reactions:The chain termination step:

This reaction involves the formation of 2-Iodopropane.(d) Propoxypropane is reacted with access of NH3:Propoxypropane is reacted with excess of NH3 to form Propylamine. The reaction is as follows:Propoxypropane undergoes nucleophilic substitution with ammonia, followed by deprotonation, to form the corresponding amine. Excess ammonia is required to drive the reaction to completion.

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The gas from a 20L helium gas tank can fill approximately 200 balloons.

To determine the number of balloons that can be filled with the gas from a 20L helium gas tank, we need to calculate the volume of helium gas in the tank and then divide it by the capacity of each balloon.

Given:

Volume of helium gas tank = 20 L

Capacity of each balloon = 100 cm³

First, we need to convert the volume of the helium gas tank to cubic centimeters (cm³) since the capacity of the balloon is given in cm³.

20 L = 20,000 cm³

Now, we can divide the volume of the helium gas tank by the capacity of each balloon:

Number of balloons = (Volume of helium gas tank) / (Capacity of each balloon)

Number of balloons = 20,000 cm³ / 100 cm³ = 200

Therefore, the gas from a 20L helium gas tank can fill approximately 200 balloons.

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The most likely weak acid titrated with NaOH in the given scenario is HClO (hypochlorous acid). This is because its Ka value is consistent with the behavior of a weak acid.

In a titration curve, the acid's strength can be estimated by analyzing the shape of the curve, particularly the pH at the equivalence point and the buffering region. The Ka value of HClO is around 3.5 × 10⁻⁸, which indicates that it is a weak acid. During titration, as NaOH is added, it neutralizes HClO to form water and a salt (NaClO). The curve for a weak acid will show a buffering region where the pH changes slowly as more NaOH is added. At the equivalence point, the curve will have a steep rise in pH. The shape of the given titration curve, along with the provided information, suggests that the most likely weak acid titrated with NaOH is HClO (hypochlorous acid).

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Answer:

The hydroxyl  group and aldehyde group

The form polar bonds

Explanation:

Glucose has a very high melting point compared to cyclohexane. What could the secret be?

We now turn our attention to the structure of the both molecules. While cyclohexane is just an alkane, glucose contains both the -OH and the CHO groups  which form polar bonds.

In cyclohexane, the only intermolecular force is the London dispersion forces while the intermolecular forces in glucose include the London dispersion forces as well as dipole interactions occasioned by the presence of polar -OH and -CHO groups in the molecule thereby increasing the melting point of glucose far above that of cyclohexane.

By loading the TLC plate from a solution with the eluted solution, the extraction of a required material after chromatography can be done through the eluted solution.

An eluted solution is generally used for the separation or extraction of one material from other through washing with the eluted solution.

By doing so, separate layers could be obtained. This process is usually done for extracting the pure form of RNA from cells, primary cell isolates, and animal and plant tissues from tumors.

Elution refers to the extraction of a substance from the solid adsorbed medium after the process of chromatography without impurities with the help of a solvent.

So, when a TLC plate is loaded from a solution to an eluted solution, then the adsorbed material from the solid medium gets extracted or separated. This would be the possible outcome.

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false, the rusting of iron can be prevented by painting, oiling, greasing or varnishing its surface.