the chemical bonds that form when atoms that have lost electrons are electrically attracted to atoms that have gained electrons are called

The chiral ketone (2R) -2-methyl-1-phenylbutan-1-one is converted into

(2S)-2-methyl-1-phenylbutan-1-one by base‑catalyzed racemization.

The mechanism of base‑catalyzed racemization of the chiral ketone is as above.

Ketone is defined as the organic compounds having C=O as a functional group.

Chiral ketone are those in which the the alkyl group bonded with C=O are same.

Base‑catalyzed racemization is defined as a process in which the optically active compounds which is consist of only one enantiomer are allow to converted into an equal mixture of enantiomers having zero optical activity in the presence of catalyst which is basic in nature.

Racemization rates are mainly dependents on the molecule and conditions some of them are pH and temperature.

Thus, we concluded that the chiral ketone (2R) -2-methyl-1-phenylbutan-1-one is converted into

(2S)-2-methyl-1-phenylbutan-1-one by base‑catalyzed racemization.

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When Using a gas tube spectroscopy , it give off a certain color or colors when Electrons which are in the gaseous atoms first starts to get excited, and then they tend to fall back to smaller form of energy levels, thereby emitting light that is of a unique  color in the process.

Isaac Newton through  his experiment in 1666.

Energy often excited if the electrons in the gases tends to move to a higher energy states.

Note that for them to be able to get back to the ground state, electrons need to let off excess energy and this is often done in the form of light. The light is said to have different color in all of the tube because of they have different wavelengths of light that need to be released.

Therefore, When Using a gas tube spectroscopy , it give off a certain color or colors when Electrons which are in the gaseous atoms first starts to get excited, and then they tend to fall back to smaller form of energy levels, thereby emitting light that is of a unique  color in the process.

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Answer: This may help you

https://ay.live/1vVB3

Explanation:

The balanced equation of Fe + [tex]H_{2} O[/tex] → [tex]Fe_{3} O_{4}[/tex] + [tex]H_{2}[/tex] is given as ,

3 Fe + 4[tex]H_{2} O[/tex] → [tex]Fe_{3} O_{4}[/tex] + 4[tex]H_{2}[/tex]

The balance equation is the equation in which number of atom in reactant side is equal to number of atom in product side .

The inclusion of stoichiometric coefficients to the reactants and products is necessary to balance chemical equations . This is significant because a chemical equation must adhere to the laws of conservation of mass and constant proportions , meaning that both the reactant and product sides of the equation must include the same amount of atoms of each element .

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The path integral molecular dynamics study describes the effects of nuclear quantum fluctuations on the dynamical and equilibrium characteristics of bifurcation pathways in hydrogen-bonded dimers combining ammonia and water.

At the order of 20 K of cryogenic temperatures , the hydrogen atoms in the molecules along these isomerizations acting as hydrogen-bond donors interchange their original connective characters. It comprises three stages in the resulting quantum transition paths, the final and the initial states comprise general rotations during which two protons possess their classical-like characteristics

The impacts from quantum fluctuation are displayed in the changes operated at the medium passages over transition states, as the proton's spatial extents stretch over usual lengths comparable to the distances between dangling and connective basins of attractions.

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12.5 grams will be left.

Given:

half life of X= 6 days

Initial amount - 50 kg

Amount left after 3 days = ?

Half life - The period of time needed for anything to go through a process in which half of it participates, for example, the period of time needed for half of a radioactive substance's atoms to disintegrate. It means after half life the element will become half its quantity.

A quantity's half-life (symbol - t1/2) is the amount of time needed for it to decrease to half of its initial value. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.

According to the question, If half life is 6 days and we start with 50 kg of element, after 6 days it will become 25 kg and after 3 days it will become 12.5 grams .

t¹/₂ = 6 days

Initial amount = 50 kg

After half life = 50/2

                     = 25 kg

∴ After 3 days = 25/ 2

                        = 12.5 kg

Hence, 12.5 kg is left after 3 days.

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The liquid with a mass of 31.1415 g and a volume of 30.13 ml has a density of: 1.033 g/ml

The density formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula we get:

d = m/v

d = 31.1415 g/30.13 ml

d = 1.033 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Influenza viruses spread mainly through droplets of respiratory secretions in the air, typically generated by coughing and sneezing.

A contagious illness brought on by influenza viruses, influenza is also referred to as "the flu." Flu-like symptoms, which can range in severity from moderate to severe, frequently include fever, runny nose, sore throat, muscle discomfort, headache, coughing, and exhaustion. After being exposed to the virus, these symptoms usually appear one to four days later and remain for two to eight days.

Especially with children, diarrhea and vomiting can happen. Pneumonia, which can be brought on by the influenza virus or a subsequent bacterial infection, may develop from the viral-related illness. Other side effects of infection include meningitis, encephalitis, acute respiratory distress syndrome, and deterioration of pre-existing conditions like asthma and cardiovascular disease.

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5.70 kg = 5700000mg

kg- The International System of Units (SI) uses the kilogram (sometimes known as the kilogram) as the unit of mass.

mg- a unit of mass or weight that weighs 0.0154 grains or one thousandth of a gram.

Conversion is important because It's necessary to convert units; it's not merely important. Scientists and engineers have miscommunicated, leading to the loss of space probes.

You are aware that 1,000 g make up 1 kilogram.

After that, change 1 kilogram to milligrams.

To convert from grams to milligrams, multiply the number of grams by 1,000.

A kilogram is equivalent to one million milligrams.

∵1 Kg = 1000000 mg

∴ 5.70 kg = 5.70 x 1000000

               = 5700000 mg

Hence , 5.70 kilograms equals 5700000 milligrams.

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The hydrogen bonding of water is one of the main property of water which makes it responsible for all the other physical and chemical properties.

Water molecules are polar in nature and they form hydrogen bonds. Hence, they have a high boiling point , high specific heat and density. Water can exhibit the properties of an acid, as well as a base (amphoteric character). The water molecules are constantly moving and the hydrogen bonds continuously breaks and forms again. These hydrogen bonds are strong, which is the reason for the unique properties of water.

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The theoretical yield of bromobenzene in this reaction when 30.0g of benzene reacts with 65.0 g of bromine is: 46.153 %

To solve this problem the theoretical yield formula and the procedure we will use is:

theoretical yield = relation between reactants * 100  

Information about the problem:

Applying the theoretical yield formula we get:

theoretical yield = (30.0g * 1g /65.0 g) * 100

theoretical yield = 46.153 %

In chemistry, the yield of a reaction is the amount of product obtained from the conversion of the reactants in a chemical reaction.

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Answer: This is True

Explanation: I'm only writing this part so that it counts. :)

Answer: True

Explanation: because you got to understand we use electricity every day.

Answer:

B

Explanation:

This is because due to the fact that they are not attracted to each other they do not form a solution

Answer:

False.

Explanation:

Dimensional analysis is a way of converting quantities. The study of space and time is cosmology.

Given the conditions for a reaction to be spontaneous under a given set of reaction conditions, the reaction not proceed spontaneously at the given temperature; option A



Spontaneous reactions are reactions that proceed without an input of extra energy as the reaction favors the formation of products under the given reaction conditions.

For spontaneous reactions, free energy change, ΔG is negative and entropy ΔS is positive.

Given the above reaction occurring at the given conditions:

H₂ (g) + Br₂ (g) → 2 HBr(g)

The reaction was carried out at 25 °C.

ΔH is -72 kJmol⁻¹ and ΔS =  - 106 Jmol⁻¹K⁻¹

The reaction is an exothermic reaction at room temperature

The entropy, ΔS of the reaction is negative indicating that the reaction is not spontaneous at that temperature.

Therefore, correct conclusion will be that the reaction is exothermic at the given temperature but will not proceed spontaneously under the given conditions.

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The number of atoms in 1 inch is 240 billion atoms

Given:

diameter of atom = 1.0 × 10^-10 m

To Find:

atoms are there along a 1.0-inch line

Solution:

1 inch = 0.254 m

0.254 m = 1 inch

1 m = 1/0.254 = 3.93 inch

1.0 × 10^ -10 = 3.93 x 1.0 × 10^-10 = 3.93 x 10^-10 inch

3.937 x 10-2 inches. This is approximately 4 one-billionths of an inch.

Divide 24 cm by the atomic diameter to get the number of atoms.

24/ (1.0 x 10^-10)= 24 x 10^10 = 2.4 x 10¹¹

240 billion atoms

Hence, the number of atoms in 1 inch is 240 billion atoms

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A student says that all pure substances are elements. Do you agree? Why or why not?

i don't. pure substances include elements, compounds and crystals. they would've been correct if they stated all elements were pure substances.

or

I disagree. Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.

An ionic equation for the displacement reaction between copper ions and iron: Cu²⁺(aq) + Fe(s) → Cu(s) + Fe²⁺(aq)

In this chemical reaction, there is a transfer of electrons from iron (Fe) to copper (Cu).

Iron change oxidation number from 0 to +2 (loose electrons) and copper change oxidation number from +2 to 0 (gain electrons).

Oxidation half reaction: Fe⁰ → Fe²⁺ + 2e⁻.

Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.

Oxidation is increase of oxidation number.

Reduction is lowering oxidation number because atom gain electrons.

(aq) is an aqueous solution.

(s) is a solid, insoluble in the water.

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Atoms form positive ions by losing electrons or negative ions by gaining electrons through a special type of chemical combination called electrovalent or ionic combination.

It follows that metals are electropositive elements which donates its valence electrons to the nonmetals. The atoms which donates its electrons become positively charged while the species that recieve electrons become negatively charged.

In the formation of sodium chloride, sodium donates its 1 valence electron to chlorine become positively charged; Na+ and chlorine which recieves the electron to add to it's 7 valence electrons become negatively charged; Cl-

Na + Cl ---- Na+Cl-

So therefore, atoms form positive ions by losing electrons or negative ions by gaining electrons through a special type of chemical combination called electrovalent or ionic combination.

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The final concentration after adding 2L of water to a 0.50 L volume of 12 M KCl is 2.4 M.

The concentration of a solute in terms of molarity is expressed as the number of moles of solute per liter of solution. The problem is regarding the dilution process of KCl. The molarity can be calculated using the dilution formula, expressed as (initial concentration of 1st solution)(initial volume)=(final concentration)(final volume). This formula shows that the number of moles remained the same throughout the process.

(12 M KCl) * ( 0.50 L) = (final concentration) ( 0.50 L + 2.0 L)

final concentration = 2.4 M KCl

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The mass is 16.7 g and the volume is 16.2. The percent error is 2 percent.

Percent error is the difference between the estimated value and the calculated value. Percent error is calculated by the actual value subtracted by the expected values divided by the expected value.

Given, that the density is 1.00 g/ml

The temperature is 4-degree celsius

The mass is 16.7 g

The volume is 16.2 l

Density = m/v  16.7 / 16.2 = 1.03 which is the actual value

The estimated value is 1.00 g/ml

The formula is

1.03 - 1.00 /  1.00 = 0.02

0.02 x 100 = 2 %

Thus, the percent error is 2 %.

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The amount of heat created or absorbed during a reaction that takes place under a constant amount of pressure is measured by the enthalpy change.

The change in enthalpy that occurs as one mole of a compound is created from its component parts is known as the "heat of formation." The total amount of energy that should be added to or released during a chemical reaction is known as the heat of reaction.

By deducting the total of the standard enthalpies of formation of the reactants from the sum of the standard enthalpies of formation of the reactants and products, one can determine the standard enthalpy change of formation.

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The number of protons and electrons in an atom is equal, making them neutral particles. According to definition, an ion is an electrically charged particle that is created by either taking electrons from a neutral atom to generate a positive ion or adding electrons to produce a negative ion.

Take note that while the ion is known as fluoride, the atom is called fluorine. The electronic structure of a fluoride ion is similar to that of a neon atom (Ne). A fluoride ion, however, is not a neon atom. A fluoride ion's nucleus, which is an atom of fluorine, has 9 protons, but the nucleus of a neon atom has 10.

The fluorine atom has nine electrons, but the fluorine ion (flouride) has ten, meaning that while fluorine has nine protons and electrons, the flouride has one more electron than the fluorine atom does, which has nine and ten electrons respectively.

While flouride is negatively charged electrically, fluorine is electrically neutral.

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The correct answer as to which observation most likely indicates that only a chemical change has taken place would that the change cannot be reversed.

A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or either decomposes to form more substances)

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The Phlogiston Theory of ordinary burning posited that the materials that were combustible all contained a material called Phlogiston.

In science, theories are often put forward to explain a phenomenon.  theory may not survive the test of time when contrary evidences begin to emerge.

The Phlogiston Theory of ordinary burning posited that the materials that were combustible all contained a material called Phlogiston  which is released when the material is burnt.

However, Lavoisier was able to show by experiment that this position was a mere speculation and the the combustion of a substance was due to its reaction with oxygen.

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As the solution turns yellow when re cabbage juice indicator  is added it implies that its base solution so the color of the  solution when hibiscus flower juice added is dark grey to green.

when hibiscus indicator added Anywhere from dark pink to pale pink usually indicates an acid, while dark gray to green colors usually indicate a base.

Dark blue should be the color of  red cabbage indicator. The cabbage indicator's color will shift to red or pink if the solution is an acid, and to green or yellow if the solution is a base. In the event that the test solution is neutral, it will stay purple or blue

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