this question relates to the1h-nmr spectrum of an alkane and two alkenes. how many proton environments are there in 2-methylbut-2-ene? how many proton environments are there in 1-bromo-4-chlorobutane? how many proton environments are there in trans-2-pentene what are the multiplicities of each proton environment in 2-methylbut-2-ene? what are the multiplicities of each proton environment in 1-bromo-4-chlorobutane? what are the multiplicities of each proton environment in trans-2-pentene?

Answer:The explanation is true

Directly proportional is like temperature and volume

V=kT  as Temp increases, volume increases

Inversely proportional is like pressure and volume

VP=k  as P increases, V decreases.

since wavelength time frequency is the speed of light,

wavelength and frequency are inversely proportional

lf=c

Explanation:

In electromagnetic waves, the frequency and wavelength are inversely proportional, which means if one gets larger, the other must get smaller. ...

As heat is added to the solid sample of hexane at -95°C, its potential energy increases. This causes the bonds between the molecules to weaken and eventually break, leading to a transition from a solid to a liquid state. The potential energy continues to increase until the hexane is completely melted.

This refers to the energy of a molecule as a result of the positions of its nuclei, r. This energy of a system of two atoms is based on the distance between them. At large distances the energy is zero, which means “no interaction”.

potential energy of the molecules is calculated using the formula:

P.e = mgh

Where,

P.e =  potential energy

m = mass

g = Gravitational force

h= height

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Answer:

0 Celsius

Explanation:

its 0 degrees C

Answer:

0°C =  32°F

Explanation:

The Delta H or standard enthalpy of reaction is -677.826kj/mol .

Given,

An atomic hydrogen torch is used to cutting and welding thick sheets of metal.

When H2 passes through an electric arc, the molecules decomposes in to atoms, which react with O2.

Temperatures over 5000°C are reached, which can melt all metals.

The equation of the breakdown of H2 to H atoms is given by,

H2(g) +heat ------> 2H(g)

The equation for the H atoms with oxygen is given by,

4H(g) + O2(g) ----------->2H2O(g)

The product also remains in gaseous state as the temperature is very high.

Now,

Delta H rxn =Delta H products - delta H reactants

=2(-241.826KJ/mol) - (4×218.0 KJ/mol)

=-1355.652Kj/mol

This is the Delta H for 2 moles of product.

Thus, Delta H for 1 mol of product = -1355.652/2

= -677.826Kj/mol

Hence, the Delta H or enthalpy of reaction per mole of product is 677.826kj/mol .

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Answer:

This question is a practical question and hence incomplete

Explanation:

However, there are some steps that can be followed to achieve the aim of this question.

To convert millimeters (mm) to cubic centimeters (cm³), the value in millimeter will have to be divided by 1000. This is because 1 mm equals 0.001 cm³. Hence, if the volume in the data is 30 mm, the equivalent in cm³ will be

30/1000 = 0.03 cm³

OR

1 mm ⇒ 0.001 cm³

30 mm ⇒ ?

Let's assume the unknown (?) is X

1 × X = 30 × 0.001

X = 0.03 cm³

Hence, 30 mm equals 0.03 cm³

Also, to convert any volume from cubic centimeter (cm³) to square meter (m²), you will divide the unit in cm³ by 1 × 10⁶ (1,000,000). To convert the value obtained earlier (0.03 cm³ or 3 × 10⁻² cm³) to m², you will

1,000,000 cm³ ⇒ 1 m²

0.03 cm³ ⇒ ?

Let's assume the unknown (?) is Y

1000000 × Y = 0.03 × 1

Y = 0.03/1000000 OR you can write it as 3 × 10⁻² × 10⁻⁶

Y =  3 × 10⁻⁸m²

Hence, 0.03 mm equals 3 × 10⁻⁸ m²

a. 1s 2s 2p 3s 3p 4s 3d 4p is the correct option.

This gives the following order to fill the orbit: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, (8s, 5g, 6f, 7d, 8p, and 9s)

Aufbau's principle states that electrons fill low-energy atomic orbitals before they fill high-energy atomic orbitals. .. By following this rule, you can predict the electron configuration of an atom or ion.

There may be two electrons at the maximum of one orbit. Since the s subplane has only one orbit, it can hold up to two electrons. The p subplane has three orbitals, so it can hold up to six electrons. The d-subplane has five orbitals, so it can hold up to 10 electrons.

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Answer:

it doesn't make sense bro. how are they gonna form before atoms if they are made out of atoms? everything is

Explanation:

Under the influence of gravity, atoms came together and resulted in a blast causing the "big bang". So the statement is false as stars and planets are formed due to the colliding of atoms.

About 13.7 billion years ago, the universe underwent a dramatic expansion that caused space to expand like a huge balloon.

That sums up the Big Bang idea, which is accepted by almost all cosmologists and theoretical physicists. The theory is backed up by a lot of strong data. For instance, we are aware that the universe is still expanding right now, and that this expansion is speeding up.

According to the conventional Big Bang theory, the beginning of the universe involved a singularity, a region of infinite temperature and density whose nature is difficult for humans to comprehend. However, scholars assert that this may not truly reflect reality because the singularity idea is based on Einstein's theory of general relativity.

The origin of the cosmos is still mostly unknown. A trillionth of a second after the Big Bang, according to scientists, is where the tale may be picked up.

Therefore, the statement is false.

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liquid water For example, the limited temperature range of liquid water (0°C–100°C) severely limits its use. Aqueous solutions have both a lower freezing point and a higher boiling point than pure water.

How hot (or energetic) a substance or radiation is can be quantified by a physical value called temperature.

There are three different types of temperature scales: those like the SI scale that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron in a body; those that only rely on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by actual empirical properties of particulates rather than by theoretical principles.

Temperature is gauged using a thermometer. It is calibrated using a variety of temperature scales that historically defined themselves using various reference points and thermometric materials. The most widely used scale is the Celsius scale, previously called as "centigrade."

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Answer:

you an see the answer at the pic

Answer:

Violet is scattered most by Earth's atmosphere, but the blue cones in our eyes aren't as sensitive to it. While our red cones aren't good at seeing blue or violet light, they are a bit more sensitive to violet than our green cones.

Explanation:

Answer:

Forming bonds releases energy and is exothermic.

pull electrons away from other elements

the more electronegative an element is the more greedy it is for electrons, florine has a score of 3.98 which is the highest on the table. Meaning that it will always take the electrons from the other element

2. O Breaking bonds releases energy and is endothermic.

3.  O pull electrons away from other elements

Fluorine is a member of Halogen family having one electron less to acquire stable noble gas configuration. Thus in order to attain one more electron it will gain one electron so as to be stably complete.

Thus the correct options are given above.

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Answer:

First 1-5 in pics

I can't upload further reactions

Explanation:

6. Lucas test

ROH + Zncl2 +HCl ---> RCl + H2O

7. esterification

R-OH +R’-COOH +H+↔ R’-COOR

Answer:

8

Explanation:

trust

Based on concepts you learned in the lesson, Barrett who says he can’t wait until we discover element 120 in our environment is correct because we discover new elements everyday.

This is referred to as a chemical substance that cannot be broken down into other substances and examples include sodium , hydrogen etc.

We can infer from this argument that Barrett is correct because new elements are being discovered by scientists from time to time so it is false to say they won't be discovered anymore,.

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Answer:

Atomic Particles

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

When the proton number and electron number are unequal, the atom or molecule is an ion.

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the extra money in the budget is for If a employees watch is broken or needs to be fixed we can give out temporary watch for few days until the watch is fixed.

plz give brainlest

Answer:

10.554 amu

Explanation:

X1 has 10 amu with 72.3%

X2 has 12 amu with 100 - 72.3 = 27.7%

So average mass = 10(72.3%) + 12(27.7%)

= 10(0.723) + 12(0.277)

= 7.23 + 3.324

= 10.554 amu

Answer:

its totally d

Explanation:

4 covalent bonds will be formed by Group 4A elements. One carbon atom forms a connection with four hydrogen atoms to create the methane molecule (CH4).

When two atoms exchange one or more pairs of electrons, a covalent connection is created. These electrons are being drawn to the two atomic nuclei at the same time.

When the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

Atoms join together in a covalent bond by exchanging electrons. Nonmetals typically form covalent connections with one another. For instance, each hydrogen (H) and oxygen (O) atom in water (H2O) shares a pair of electrons to form the molecule of two single-bonded hydrogen atoms and one single-bonded oxygen atom.

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A) Out of the given options, Pyruvate is the compound that is not a component of the citric acid cycle.

The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid (TCA) cycle, is a central metabolic pathway that occurs in the mitochondria of cells. It is responsible for the oxidation of acetyl-CoA derived from various fuel sources, generating energy in the form of ATP and producing NADH and FADH2.

Pyruvate, which is a product of glycolysis, serves as the starting point for the citric acid cycle. It enters the cycle by being converted into acetyl-CoA through a series of enzymatic reactions.

On the other hand, the compounds α-Ketoglutarate, Succinate, and Malate are all intermediates of the citric acid cycle. They are involved in various steps of the cycle, participating in the generation and transfer of energy-rich electrons and the production of ATP and reduced coenzymes.

Therefore, out of the given options, Pyruvate is the compound that is not a component of the citric acid cycle.

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A neon sign contains 2.01 x 10^25 atoms of gas. 3.34 x 10^-3 moles of neon are in the sign.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

1 mole is equal to 6.023 × 10 ²³ molecules.

According to Avogadro's constant, in one mole, there are 6.02 x 10^23 atoms.

To calculate how many moles are in 2.01 x 10^21 atoms, you would divide it by the amount of atoms that fit in a mole.

2.01 x 10^21 atoms / 6.02 x 10^23

= 0.00334 moles,

= 3.34 x 10^-3 moles

Thus, A neon sign contains 2.01 x 10^25 atoms of gas. 3.34 x 10^-3 moles of neon are in the sign.

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Your question is incomplete, most probably your question was

A neon sign contains 2.01 X 1021 atoms of the gas. How many moles of neon are in the sign?

a1.21 X 1045 mole Ne

b3.34 X 10-3 mole Ne

c2.00 X 102 mole Ne

d12.10 X 102 mole Ne

Answer:

Explanation:

Symmetry can help resolve many chemistry problems and usually the first step is to determine the symmetry. If we know how to determine the symmetry of small molecules, we can determine symmetry of other targets which we are interested in. Therefore, this module will introduce basic concepts of group theory and after reading this module, you will know how to determine the symmetries of small molecules.

Introduction

Symmetry is very important in chemistry researches and group theory is the tool that is used to determine symmetry. Usually, it is not only the symmetry of molecule but also the symmetries of some local atoms, molecular orbitals, rotations and vibrations of bonds, etc. that are important. For example, if the symmetries of molecular orbital wave functions are known, we can find out information about the binding. Also, by the selection rules that are associated with symmetries, we can explain whether the transition is forbidden or not and also we can predict and interpret the bands we can observe in Infrared or Raman spectrum.

Symmetry operations and symmetry elements are two basic and important concepts in group theory. When we perform an operation to a molecule, if we cannot tell any difference before and after we do the operation, we call this operation a symmetry operation. This means that the molecule seems unchanged before and after a symmetry operation. As Cotton defines it in his book, when we do a symmetry operation to a molecule, every points of the molecule will be in an equivalent position.

Symmetry Elements

For different molecules, there are different kinds of symmetry operations we can perform. To finish a symmetry operation, we may rotate a molecule on a line as an axis, reflect it on a mirror plane, or invert it through a point located in the center. These lines, planes, or points are called symmetry elements. There may be more then one symmetry operations associated with a particular symmetry

Identity E

The molecule does not move and all atoms of the molecule stay at the same place when we apply an identity operation, E, on it. All molecules have the identity operation. Identity operation can also be a combination of different operations when the molecule returns to its original position after these operations are performed.1 This will be demonstrated later.

Answer:

To convert from moles to atoms, multiply the molar amount by Avogadro's number. To convert from atoms to moles, divide the atom amount by Avogadro's number (or multiply by its reciprocal).

Explanation:

If Half- life of an isotope is 30 days and it was assumed that the person ate 100 Bq of isotope, there are 50 transformations in the stomach.

The radioactive decay of a sample of an isotope can be characterized by the half-life of that isotope. When a radioisotope undergoes decay, its nucleus becomes unstable, and it emits particles or energy to become more stable. The half-life of an isotope is the time it takes for half of the original sample to decay. The question states that the half-life of an isotope is 30 days, and the person ingested 100 Bq of isotope. It also says to calculate the number of transformations in the stomach using GI track model information .

Since the isotope has a half-life of 30 days, we can use the following formula to find the number of transformations in the stomach:` N = N₀ (1/2)^(t/T₁/₂)`where: N₀ = initial number of nuclei N = final number of nuclei (after time t)T₁/₂ = half-life of the isotope The isotope has a half-life of 30 days, so T₁/₂ = 30 days. The question doesn't specify how long the person has had the isotope in their stomach, so we'll assume it's been there for one half-life, or 30 days. Therefore, t = 30 days.

Substituting into the formula:` N = 100 (1/2)^(30/30)`Simplifying:` N = 100 (1/2)^1`Evaluating:`N = 50`So after 30 days in the stomach, the person would have 50 Bq of the isotope left. Therefore, the number of transformations in the stomach is the difference between the initial number of transformations (100 Bq) and the final number of transformations (50 Bq):`Number of transformations in stomach = 100 - 50 = 50 transformations. Therefore, there are 50 transformations in the stomach.

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Answer:

P1V1/T1 = P2V2 / T2.

- combined gas

equation

(227×600) / 283. = (1780× P2 )/300

P2 = (300 ×227×600)/283 ×1780

P2 = 81.11

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(a) The reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol is spontaneous at 25°C.

(b) The reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol is not spontaneous at 25°C.

To determine whether a reaction is spontaneous at a given temperature, we can use the Gibbs free energy equation: Delta G = Delta H - T·Delta S, where Delta G is the change in Gibbs free energy, Delta H is the change in enthalpy, Delta S is the change in entropy, and T is the temperature in Kelvin.

For a reaction to be spontaneous, Delta G must be negative. If Delta H is negative (exothermic) and Delta S is positive (increase in disorder), the reaction is more likely to be spontaneous.

(a) For the reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol, we have Delta G = 12.6 kJ/mol - (25 + 273) K·(93 J/K·mol/1000 J/kJ) = -5.25 kJ/mol. Since Delta G is negative, the reaction is spontaneous at 25°C.

(b) For the reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol, we have Delta G = 9.5 kJ/mol - (25 + 273) K·(-94.0 J/K·mol/1000 J/kJ) = 3.57 kJ/mol. Since Delta G is positive, the reaction is not spontaneous at 25°C.

To determine the minimum temperature at which a non-spontaneous reaction becomes spontaneous, we can set Delta G equal to zero and solve for T in the equation Delta G = Delta H - T·Delta S. However, in this case, both reactions are either spontaneous or non-spontaneous at 25°C, so we do not need to calculate the minimum temperature.

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