in the reduction of acetophenone 2.0 ml (d=1.03 g/ml and mw = 120.15 g/mol) of acetophenone and 500 mg (mw = 37.83 g/mol) of sodium borohydride were used. what were the moles used for acetophenone?

The potential difference required to stop the electron is approximately -7,118.75 V. The negative sign indicates that the electron is moving in the opposite direction of the electric field.

Potential difference, also known as voltage, is a measure of the electric potential energy difference between two points in an electrical circuit. It represents the work done per unit charge to move a charge from one point to another in an electric field.

In simpler terms, potential difference is the driving force that allows electric charges to flow in a circuit. It is measured in volts (V) and is represented by the symbol "V".

A potential difference exists when there is a difference in electric potential between two points, causing electric charges to move from a higher potential to a lower potential.

Given:

Mass of the electron (m) = 9.11 x 10⁻³¹ kg

Initial speed of the electron (v) = 500,000 m/s

Charge of the electron (e) = -1.6 x 10⁻¹⁹ C

KE = (1/2) × m × v²

= (1/2) × (9.11 x 10⁻³¹ kg) × (500,000 m/s)²

= 1.139 x 10⁻¹⁵ J

The work done by the electric field is equal to the change in kinetic energy:

W = KE = 1.139 x 10⁻¹⁵ J

V = W / q

= (1.139 x 10⁻¹⁵ J) / (-1.6 x 10⁻¹⁹ C)

= -7.11875 x 10³ V

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An electron with an initial speed of 500,000 m/s is brought to rest by an electric field. The potential difference that stopped electron is 71.25 volts.

An electric field is a field of force that surrounds an electric charge or group of charges. The electric field is a vector field, meaning it has both magnitude and direction.

When an electron is brought to rest by an electric field, the electric potential energy is converted into kinetic energy and then dissipated as heat. The potential difference required to stop an electron can be calculated using the following equation:

∆V = KE/e

where KE is the kinetic energy of the electron, e is the charge of the electron, and ∆V is the potential difference required to stop the electron.

The kinetic energy of the electron can be calculated using the following equation:

KE = (1/2) \(\rm mv^2\)

where m is the mass of the electron, v is the initial velocity of the electron, and KE is the kinetic energy of the electron.

Substituting the given values into the above equations, we get:

KE = (1/2)\(\rm mv^2\)

= (1/2) \((9.11 \times 10^{-31}\ { kg} \ )\) ( \(500,000\) \(\rm m/s)^2\) = \(\rm 1.14 \times 10^{-17}\ { J}\)

∆V = KE/e

= \(\rm (1.14 \times 10^{-17} J)/(-1.6 \times 10^{-19}\ C) = -71.25\ { V }\)

Therefore, the potential difference required to stop the electron is 71.25 volts.

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The chemical potential of the air in the class at 298 K and 1 atm can be represented by the equation H-PS. Option F is the correct answer.

The chemical potential of a system is a measure of the potential energy that can be obtained or released by a substance during a chemical reaction or phase change. In this case, the chemical potential of air is determined by the enthalpy (H) minus the product of pressure (P) and entropy (S). The correct option F, H-PS, represents this relationship accurately. The enthalpy accounts for the heat content of the system, while the product of pressure and entropy captures the effects of pressure and disorder on the chemical potential.

Option F is the correct answer.

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Answer:

See explanation

Explanation:

The to main chemicals that lead to acid rain are SOx and NOx. The major source of oxides of sulphur are power plants while the major source of oxides of nitrogen is the combustion of fossil fuels.

B. There are two types of acid rain; wet and dry. Wet type acid rain occurs when NOx and SOx combine with water vapour in the atmosphere and fall as precipitation while in dry type, wind deposits these acidic gases/matter on the surfaces of buildings, cars, trees etc. Rain water washes off these acidic deposits and the runoff is more acidic than the rain water.

C. Natural rain water has a pH of about 5.5 due to the fact that water dissolve CO2 in the atmosphere. This means that natural rain water is also slightly acidic. Rain water that dissolves SOx or NOx is often more acidic than these hence the term 'enhanced acid rain' may be used.

Again, since precipitation could be solid or liquid, the term 'acid deposition' is better.

Answer:

C.

Explanation:

The main reason for this decrease is an increase in the number of vaccinations of young children. The smallpox vaccine which was created in 1796 completely allows individuals to easily and quickly fight off the smallpox disease if they were to get it. By being able to fight the disease quickly and effectively it provides less time for the disease to affect another individual. Therefore, causing cases to decrease and become very rare as time goes on.

The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.

Water is a unique molecule which is attributed to its unique characteristics or features.

Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.

Some of the characteristics of water are as follows:

Therefore, the statement that is a characteristic of water is strong cohesion.

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Answer:

Explanation:

substance (as an acid or salt) that when dissolved (as in water) conducts an electric current.

Answer:

An electrolyte is a compound which produces ions when dissolved in a solution such as water. These ions have either a positive or negative electrical charge, which is why we refer to these compounds as electro-lytes

Answer:

Caustic soda

Explanation:

The fractional distillation of air is carried out on liquid air. Before air is liquified, the carbon dioxide content of air is removed using caustic soda. The air is then compressed to a pressure of about 200 atm, sudden expansion of the gas leads to cooling. The process continues until air becomes liquid at  -200°C.

Fractional distillation of liquid air usually produces nitrogen and oxygen as major products. nitrogen in obtained first since it has a lower boiling point than oxygen. The gases are then dried, compressed and stored in cylinders.

Answer:

Because the moon's path is predictable

Explanation:

The moon affects the tides

Answer:

Propanganda

Explanation:

Propanganda can be defined as information that is often of a misleading nature. It is biased and often used to promote a political point of view.

It is the spreading of lies, half truths with the sole purpose of influencing public opinion. Propanganda works by

playing upon the fears, angers and emotions of people. It raises in people, the feelings of unpleasantness and also disgust.

Answer:

When 20.0 grams of aluminum and 30.0 grams of chlorine are reacted according to the above equation, the chlorine is the limiting reactant and the maximum yield of aluminum chloride is 0.28 moles or 37.33 grams.

The grams of magnesium hydroxide will precipitate if the 25 mL of 0.235 M magnesium nitrate are combined with the 30. 0 mL of 0.260 M potassium hydroxide is 0.227 g.

The reaction is given as :

Mg(NO₃)₂   +   2KOH  ---->  2KNO₃(aq)  +  Mg(OH)₂(s)

moles of Mg(NO₃)₂   = 0.235 × 0.025

                                  = 0.00587 mol

moles of KOH = 0.260 × 0.030

                        =  0.0078 mol

1 mole of Mg(NO₃)₂   react with 2 mole of KOH

mole of KOH = 0.0078 × 2

                      = 0.0156 mol

KOH is the limiting reagent.

2 mole of KOH  produces 1 mole of Mg(OH)₂

mole of Mg(OH)₂ =  0.0078 / 2 = 0.0039 mol

mass of Mg(OH)₂ = 0.0039 × 58.3

                             = 0.227 g

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Answer:

Nonmetals have more valence electrons and increase their stability by gaining electrons to become anions.

Answer: Because they are on the father side of the periodic table

Explanation: Electronegativity increases as you move from left to right on the periodic table

Wavelength of an EM wave indicates that as the wavelength decreases, the energy increases. option A.

The distance between identical points in adjacent cycles of a waveform signal propagated in space or along a wire is defined as the wavelength. This length is typically specified in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

The frequency and energy (E) of a wavelength decrease as its size increases. These equations show that as the frequency and energy increases, the wavelength decreases. The wavelength grows longer as the frequency decreases. There are two basic types of waves: mechanical and electromagnetic.

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The following are characteristics of ideal chemical sanitizer except: Option A. Approved for food contact surface application and option C. High in toxicity and corrosivity

Chemical substances that are capable of eradicating disease-causing microorganisms are also used to sanitize. Chlorine (bleach), iodine, and quaternary ammonium are common sanitizers. Chemical disinfectants are widely used in the food service sector.

The most often used sanitizers are those that contain chlorine. They work well against all bacteria and are reasonably priced. The ideal temperature range for bleach is between 55°F and 75°F. Hot water reduces the effectiveness of bleach. In diluted form, quaternary ammonium compounds are tasteless, colorless, and harmless.

Hospitals mostly employ the following five EPA-registered substances as disinfectants at the moment: quaternary ammonium, hypochlorite, accelerated hydrogen peroxide, phenolics, and peracetic acid.

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This significant change in the Earth's atmosphere is marked by the emergence of redbeds, sediments that contain oxidised iron.

The release of oxygen into the atmosphere led to the formation of minerals on land (continental redbeds). Since the created oxygen was absorbed by rocks for a very long time, as seen in Banded Iron Formations (BIFs) and continental red beds, it did not accumulate in the atmosphere for very long. The majority of the oxygen created over time is still preserved in the historic "banded rock" and "red bed" formations. The growth of oxygen may have been significantly influenced by the oxidation of the mantle rocks. It has been suggested that the shift from subaerial to mostly submerged volcanoes may also have resulted in a decline in volcanic emission of decreased gases.

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An organism that can manufacture food on its own utilising light, water, carbon dioxide, or other chemicals is known as an autotroph.

An organism that can manufacture food on its own utilizing light, water, carbon dioxide, or other chemicals is known as an autotroph. Autotrophs are occasionally referred to as producers since they grow their own nourishment.

A living thing that does not consume other organisms but instead obtains its own nourishment from inorganic sources or the environment. A heterotroph is an organism that cannot synthesis organic compounds from inorganic material and must receive its organic food molecules by consuming the waste of other organisms.

Given that they produce their own sustenance through photosynthesis, the majority of plants are autotrophs. There are, however, exceptions to every rule. A host serves as the food source for some parasitic, non-photosynthetic plants.

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Answer:

B

Explanation:

If the student needs one gram but so far only has 0.37 grams, then the amount they need is the difference between what they need and how much they already have. 1-0.37=0.63 grams.

...which isn't actually an option because none of them have decimal points but I would say it is B anyway because it is the equivalent ratio and maybe there was a typo.

Hope this helped!

Answer:

The answer is B :)

Explanation:

Answer:

The correct answer is

Explanation:

hope this helps u!!

First part-

Aluminum Ion Charge- +3

fluoride charge- -1

hydrogen charge- +1

chloride ion- -1

silicon ion- 4+ / +4

sulfide ion- -2 / 2-

cesium ion- 1+ / +1

gallium ion- 3+/ +3

oxide ion- 2-/-2

potassium ion- 1+/ +1

carbide ion- 2-/ -2

bromide ion- -1

barium ion- 2+/ +2

Second part- strontium- 2+/ +2

sulfur- -2

phosphorous- 3-/-3

bromine- -1/1-

Answer:

5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

Explanation:

The balanced equation in this question is

Iron + Sulfur = Iron(II) Sulfide

Fe (II) + S --> Fe(II)S

Thus one mole of sulfur reacts with one mole of Fe(II)

Hence, 5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

The sulfur atom hybridizes from sp² to sp³ during the reaction SO₂(g) + 12O₂(g) ⇒ SO₃(g).

This is because SO₂'s sulfur atom has the sp² hybridization-corresponding trigonal planar geometry of three bonding pairs and one lone pair. The geometry of the sulfur atom in SO₃ is tetrahedral, with four bonding pairs, which is the same as sp³ hybridization.

In the response SO₂(g) + ½O₂(g) → SO₃(g), the hybridization change for the sulfur particle can be made sense of as follows:

1. Determine how the sulfur atom in SO₂ hybridizes: The sulfur atom in SO₂ has one lone pair and two sigma bonds with two oxygen atoms. The valence bond theory says that it hybridizes with sp².

2. Decide the hybridization of the sulfur iota in SO₃: The sulfur atom in SO₃ does not have any lone pairs and forms three sigma bonds with three oxygen atoms. The valence bond theory says that it hybridizes with sp².

As can be seen, this reaction does not alter the hybridization of the sulfur atom. In both SO₂ and SO₃, it remains sp².

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Answer:

True.

Explanation:

The higher the 'Mol Concentration', the stronger the acid or base the substance is. For example...

1 Mol of HCl is less concentrated than 6 Mol HCl.

This is the same with bases:

1 Mol of NaOH is less concentrated than 6 Mol NaOH.

The properties of the element and its compounds are not the same. In the case of fluorine, we know that this is a volatile and reactive element but fluorides are stable and less harmful elements that can serve beneficial purposes.

Fluorine is a chemical element that is known for its ability to combine easily with oxygen and other elements. It is a highly reactive substance but this is not the case with fluorides. The fluorides have already undergone a reaction so they are no longer as volatile as fluorine in the ordinary state.

They are used in toothpaste formulations to strengthen the gums but this cannot be said of fluorine which should not be tasted in the raw state.

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The illustration of Thomson's atom represents a neutral atom. In this case, the total amount of positive charge and the total amount of negative charge must be equal. This means that there are equal numbers of protons and electrons in the atom. This is what makes the atom neutral.

A neutral atom is an atom that has no electrical charge. An atom is neutral because it has the same amount of positively charged protons and negatively charged electrons. The nucleus of an atom contains protons, which are positively charged particles. Electrons, which are negatively charged particles, are located in the atom's electron cloud around the nucleus.

Electrons, protons, and neutrons are the three components of atoms. Electrons are negatively charged, protons are positively charged, and neutrons have no charge. Electrons are found outside the nucleus of the atom and are continually moving at high speeds.

In summary, if the illustration of Thomson's atom represents a neutral atom, then the total amount of positive charge and the total amount of negative charge must be equal. This means that there are equal numbers of protons and electrons in the atom. This is what makes the atom neutral.

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False. For all atoms of the same element, the 2s orbital is not larger than the 1s orbital.

The size or spatial extent of an atomic orbital is primarily determined by its principal quantum number (n). The larger the principal quantum number, the greater the average distance of the electron from the nucleus, resulting in larger orbitals. In this case, the 2s orbital has a larger principal quantum number (n = 2) compared to the 1s orbital (n = 1), which might lead to the misconception that the 2s orbital is larger.

However, in terms of size, the 1s orbital is actually smaller than the 2s orbital. This is because the 1s orbital is closer to the nucleus, experiencing a stronger attraction and resulting in a smaller spatial distribution compared to the 2s orbital. The 2s orbital, being in a higher energy level and having a larger average distance from the nucleus, occupies a larger volume of space.

In summary, the 2s orbital is larger than the 1s orbital in terms of spatial extent and volume.

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Elements are now organized by increasing atomic mass. Hence, option B is correct.

The periodic table is a tabular array of chemical elements organized by atomic number.

Mendeleev's periodic table orders the elements based on their atomic mass whereas the Modern periodic table orders the elements based on their atomic number.

Hence, option B is correct.

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Answer:

A chemical compound.

For example...

\(C + H2 + O1 = Cx(H2O)y(carbohydrate)\)

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The set of numbers used to explain the position and energy of the electron in an atom are called quantum numbers.

There are four quantum numbers, namely, principal, azimuthal, magnetic and spin quantum numbers.

Quantum numbers are the set of numbers used to explain the location and electricity of an electron in an atom. There are four sorts of quantum numbers: foremost, azimuthal, magnetic, and spin. Quantum numbers represent the values of a quantum gadget's conserved portions.

The first quantum range is called the principal quantum number. The important quantum range largely determines the electricity of an electron. Electrons in the equal atom that have the identical foremost quantum variety are said to occupy an electron shell of the atom.

Quantum physics is the observe of depend and strength on the maximum essential stage. It pursuits to discover the residences and behaviors of the very constructing blocks of nature. at the same time as many quantum experiments examine very small gadgets, inclusive of electrons and photons, quantum phenomena are all round us, acting on each scale.

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When a piece of magnesium ribbon is dropped into Copper Sulfate Solution, magnesium is reactive metal than copper in Copper sulfate and Copper Metal it will displace copper forming magnesium Sulphate and copper metal.

Magnesium + Copper Sulphate ⇒ Magnesium Sulphakt Copper

My (s) + Cuso4 (aq) ⇒  Mg so4 lag + Cu(s).

When magnesium is put into a copper sulfate solution an oxidation-reduction reaction occurs, forming copper metal on the magnesium, and the dark blue color of the solution disappears. After a few minutes, hydrogen gas bubbles form on the surface usually with coils of magnesium ribbon floating on it.

The solution becomes lighter during the reaction and the blue color of the copper sulfate solution does not darken. Therefore option C is the correct answer. It should be noted that the reaction taking place here is a substitution reaction in which a more reactive metal displaces a less reactive metal.

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Here is the answer

I hope it helped you