3. given that the tlc conditions are identical, explain why the two hydroxyacetophenone isomers have different rf values.

The three main types of intermolecular forces that will be explored in lab are:

London dispersion forces (also known as van der Waals forces): These are the weakest intermolecular forces and occur between all molecules. They result from temporary fluctuations in electron distribution, leading to temporary dipoles. London dispersion forces increase with increasing molecular size and shape.

Dipole-dipole forces: These forces occur between polar molecules and result from the attraction between the positive end of one molecule and the negative end of another. Dipole-dipole forces are stronger than London dispersion forces.

Hydrogen bonding: Hydrogen bonding is a special type of dipole-dipole interaction that occurs when hydrogen is bonded to highly electronegative atoms such as oxygen, nitrogen, or fluorine. It is stronger than regular dipole-dipole forces.

These intermolecular forces play a crucial role in determining the physical and chemical properties of substances, including boiling points, melting points, and solubilities.

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Answer:

D) C5H12

Explanation:

The rate of evaporation of a solution depends on the nature of intermolecular forces in the solution. The stronger the magnitude of intermolecular forces present the lower the rate of evaporation.

If we consider the compounds; C7H15OH, C7H15NH2 and C6H13COOH, the presence of polar groups implies that dipole-dipole interactions are present in the molecule leading to stronger intermolecular interaction and a slower rate of evaporation.

On the other hand; C7H16 and C5H12 are alkanes. The intermolecular forces that exists between their molecules is the weak dispersion forces. However, the magnitude of dispersion forces increases as the molecular mass of the compound increases.

Hence, C5H12 has the fastest rate of evaporation since it has the lowest molecular mass.

The ΔE for the heat of the combustion of one mole of the propane that is C₃H₈ is -2219.9 kJ.

The chemical equation is as :

C₃H₈(g)  +  5O₂(g)  ---->   3CO₂(g)  +  4H₂O(l)

The standard enthalpies are :

CO₂ = -393.5 kJ/mol

H₂O = -285.8 kJ/mol

O₂ = 0 kJ/mol

C₃H₈ = -103 kJ/mol

The heat of the combustion is as :

ΔE = [3 × ΔH°f(CO₂(g)) + 4 × ΔH°f(H₂O(l))] - [1 × ΔH°f(C₃H₈(g)) + 5 × ΔH°f(O₂(g))]

ΔE = [3 × (-393.5 kJ/mol) + 4 × (-285.8 kJ/mol)] - [1 × (-103.8 kJ/mol) + 5 × (0 kJ/mol)]

ΔE = -2219.9 kJ

The heat for the combustion for the 1 mole of the propane is -2219.9 kJ.

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Answer:

Explanation:

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Answer:

By measuring friction along faults, scientists can tell where rocks are moving along easily and where they are locked. They hope to use this information to predict where major earthquakes might occur.

Explanation:

Answer:

By measuring friction along faults, scientists can tell where rocks are moving along easily and where they are locked. They hope to use this information to predict where major earthquakes might occur.

Explanation:

tOaTLLY DiDnT cOpY iT

Energy required to vaporize : 32.3 kJ

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

Mass of water = 14.27 g

Latent heat of vaporization ( boiling point of 100 ºC) :  2260 J/g

Energy required :

\(\tt Q=m.Lv\\\\Q=14.27\times 2260\\\\Q=32250.2~J\approx 32.3~kJ\)

The reaction of 3.8 mol of Al with 6.2 mol HBr will produce 3 mol of H₂.

The reaction's chemically balanced equation,

3H₂ + 2AlBr₃ → 2Al + 6HBr

As per the equation, 2 moles of hydrogen gas makes 2 moles of Al and correspondingly 6 moles of HBr.

Therefore, if 6.2 moles of hydrogen bromide and 3.8 moles of aluminium react.

3 mol HBr per 1 mol Al

Therefore, 3.8 mol Al (3 mol HBr/1 mol Al) = 11.4 mol HBr is needed for a complete reaction.

Since we only have 6.2 mol of HBr, HBr is limited and Al is abundant.

3 mol H2 / 6 mol HBr = 3 mol H₂ from 6 mol HBr

As a result, 3 mol of H₂ will be produced when 3.8 mol of Al and 6.2 mol of HBr react.

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The concentration of the HCI solution is 0.20M.

During a titration, the concentration of one solution is used to determine the concentration of another solution. The equation for this is:

M1V1 = M2V2

Where M1 is the concentration of the first solution, V1 is the volume of the first solution, M2 is the concentration of the second solution, and V2 is the volume of the second solution.

In this case, we are given the volume and concentration of the NaOH solution (V1 and M1) and the volume of the HCI solution (V2), and we are asked to find the concentration of the HCI solution (M2).

Plugging in the given values into the equation, we get:

(0.25M)(40.0ml) = (M2)(50.0ml)

Solving for M2, we get:

M2 = (0.25M)(40.0ml) / (50.0ml)

M2 = 0.20M

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The measure of the total energy radiated by a star in one second is called luminosity.

Luminosity represents the intrinsic brightness of a star and is a measure of the total power output in terms of energy. It is an important characteristic of a star that indicates its size and temperature.

Luminosity is typically expressed in units of watts or solar luminosities (the luminosity of our Sun). Flux, on the other hand, refers to the amount of energy received per unit area per unit time, and it is influenced by the distance between the star and the observer. Apparent magnitude and absolute magnitude are measures of a star's brightness as observed from Earth and at a standard distance, respectively, and they are related to luminosity but not the direct measure of energy radiated.

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Answer:

B. A Physicist

Explanation:

Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

Answer:

The battery is a store of internal energy (shown as chemical energy). The energy is transferred through the wires to the lamp, which then transfers the energy to the surroundings as light. These are the useful energy transfers - we use electric lamps to light up our rooms.

Explanation:

Chemicals that change behavior or mood by directly affecting activity of the postsynaptic cell are referred to as neurotransmitter

In a chemical synapse the postsynaptic membrane is the membrane that receives a signal from the presynaptic cell and respond via depolarization or hyperpolarization and neurotransmitter play an important role in neural communication and they are chemical messengers that carry massages between nerve cell and other cell in your body and influencing everything from mood to involuntary movements and monoamine neurotransmitter such as dopamine are the most important neurotransmitter in the pathophysiology of mood disorders

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Answer:

2nd answer

Explanation:

The first answer is wrong because when the gas molecules collide with the walls of the container or with other molecules, there is no loss in the kinetic energy of the gas molecules.

And the third answer is describing a solid.

The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.

So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

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The branch of science that studies atoms is called atomic physics.

The study of the atom's structure, interactions with other particles, and subatomic energy levels is known as atomic physics. It has been established that this area of physics is an excellent application of quantum mechanics. It is one of the fundamental tenets of contemporary physics. Atomic, molecular, and optical physicists investigate the interactions between atoms, small molecules, electrons, and light.

Atomic energy levels and the excitations and de-excitations that go along with them play a significant role in many physical characteristics of matter and natural processes. A few examples are the hue of a rose, a laser's output, and the transparency of air. The founder of nuclear physics, Ernest Rutherford, was a New Zealander by nationality.

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The reason why the elements above and below each other may be similar is that they have the same number of valence electrons.

Since the beginning of chemistry, there have always been a need for the systematization of the elements. There are currently about a hundred and twenty elements in the periodic table. The elements that can be found in the periodic able are arranged in groups and periods.

The groups are the vertical columns that we find in the periodic table while the periods are the horizontal rows that we find in the periodic table. All the elements in the same group have the same number of valence electrons while the elements in the same period have the same number of shells.

Thus, the elements that are above and below each other in the periodic

table have similar physical and chemical properties because they have the same number of valence electrons.

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Each isotope's atomic mass unit is substituting. We are given the following percentages: 90% divided by 100% of x 35, 8% divided by 100% of x 37, and 2% divided by 100% of x 38. As a result, the averag atomic mass unit is near to 30 at 35.

Atoms of the same element that have variable numbers of neutrons but the same number of protons are called isotopes.

Average The arithmetic mean is calculated by adding a set of numbers, dividing by their count, and then taking the result. The average of 2, 3, 3, 5, 7, and 10 is one example.

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The rate of effusion of a gas is inversely proportional to its molar mass.

Therefore, the gas with the molar mass closest to that of nitrogen (14 g/mol) will have the most similar rate of effusion to nitrogen at 350 K.

The gas with the molar mass closest to that of nitrogen is hydrogen (1 g/mol). Therefore, the gas with the most similar rate of effusion to nitrogen at 350 K is hydrogen (H2). The other gases (CH4, CO, CO2, and Ne)

all have molar masses significantly higher than nitrogen, and therefore they will have slower rates of effusion than nitrogen at 350 K.

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The compound being tested could not be a simple alkane such as methane, ethane, propane, or butane as they do not have any absorption bands in the 1700-1800 cm-1 range in their IR spectra.

Based on the absorption band between 1700-1800 cm⁻¹ in the IR spectra, it is likely that the compound being tested contains a carbonyl group (C=O). Therefore, any compound that does NOT have a carbonyl group would not be the one being tested. Without a list of specific compounds to choose from, I cannot provide an exact answer.

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Answer:

Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.

ex- cheese, milk, aerosol spray, mayonnaise

Answer: sodium

Explanation: Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.

Based on the flame test, the gaseous element which is present in street lights is sodium.

Spectrum is a table or a chart in which intensity of the emitted lights are showing over a range of species.

Each element show different color of spectrum in the emission process, whenever excited element emitted enegy then released energy is shown in the form of color spectrum. In traffic lights sodium lamps are present which in the presence of heat gets excited and changes to the gas form and emitted yellow color light.

Hence sodium gaseous element is present in street lights.

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Answer:

I think ammonium nitrate is correct answer

is there any other options please check that question once

Answer:

The air that is inside a ship is much less dense than water. That's what keeps it floating