Why
was Bohr's model important in understanding the atom?

The name of the aromatic hydrocarbon shown in the photo is 1,4-dimethylbenzene.

Xylene, xylol or dimethylbenzene is a derivative of benzene. It is made up of carbon and hydrogen. It is a colorless, flammable liquid with a toluene-like odor. This aromatic hydrocarbon is a good solvent, we find it in many fuel formulations.

This aromatic hydrocarbon is found in different substances such as some oils, in coke gases (combustible gases that have a luminous flame when burned) and in gases obtained from the distillation of wood.

Xylenes are substances that can affect the functions of living beings, their vapors can give different symptoms such as nausea, headache and discomfort.

Therefore, we can confirm that the name of the aromatic hydrocarbon shown in the photo is 1,4-dimethylbenzene.

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Phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.

Polar molecules tend to be soluble in water. The greater the dipole moment, the greater the polarity of the compound. We can see that  Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a dipole moment of 1.7 x 10-8 esu cm.

Now, It is confusing to observe that the solubility of Nitrobenzene  in water is far less than that of phenol despite its higher dipole moment. The reason for this observation is that, phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.

Therefore, phenol is more soluble in pure water as a solvent compared to nitorbenzene.

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This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.

By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.

In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.

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Cr2Na2O7

Sodium Dichromate

From the specific heat capacity of mercury, the amount of heat energy required to raise the temperature of 4.0 g of mercury metal from 9.3 °C to 83.0 °C is 77.792 J.

The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius or kelvin.

The specific heat capacity of a substance is a constant that can be used to calculate the amount of heat required to raise the temperature of a given mass of a substance to any temperature.

The specific heat capacity of mercury is 0.140 J/g/k.

The formula for calculating specific heat capacity is given below:

Specific heat capacity, c = Δq/mΔT

where;

Δq = heat change

m = mass of the substance

ΔT = temperature change

The Heat required, Δq, will then be:

Δq = m * c * ΔT

Heat required, Δq = 4.0 * 0.140 * (83.0 - 9.3)

Heat required, Δq = 77.792 J

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Answer:

2.77495 moles

Explanation:

Boron= 10.811g (according to periodic table)

\(33g*\frac{1mole}{10.811g B}=2.774951 moles B\)

Answer:

a. The Zn and HCl both retained their identity.

The molar mass of compound of magnesium chloride is 95.211 g/mole while that of ammonium sulfate is 132.14 g/mole.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

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The empirical formula of the organic compound is CH4O.

To find the empirical formula of the organic compound, we need to determine the ratio of the number of moles of each element in the compound.

Calculate the number of moles of carbon dioxide (CO2) produced:

mass of CO2 = 2.05 g

molar mass of CO2 = 44.01 g/mol

n(CO2) = mass of CO2 / molar mass of CO2

n(CO2) = 2.05 g / 44.01 g/mol

n(CO2) = 0.0466 mol

Calculate the number of moles of water (H2O) produced:

mass of H2O = 1.65 g

molar mass of H2O = 18.02 g/mol

n(H2O) = mass of H2O / molar mass of H2O

n(H2O) = 1.65 g / 18.02 g/mol

n(H2O) = 0.0916 mol

Calculate the number of moles of carbon in the compound:

n(C) = n(CO2) = 0.0466 mol

Calculate the number of moles of hydrogen in the compound:

n(H) = n(H2O) x 2 (since there are 2 hydrogen atoms in each water molecule)

n(H) = 0.0916 mol x 2

n(H) = 0.1832 mol

Calculate the number of moles of oxygen in the compound:

n(O) = (mass of compound - mass of C - mass of H) / molar mass of O

n(O) = (2.50 g - 2.05 g - (0.1832 mol x 1.008 g/mol)) / 15.99 g/mol

n(O) = 0.0579 mol

Find the simplest whole number ratio of the elements in the compound by dividing each of the mole values by the smallest mole value:

n(C):n(H):n(O) = 0.0466 mol : 0.1832 mol : 0.0579 mol

n(C):n(H):n(O) = 0.255 : 1 : 0.319

Multiply each of the mole ratios by a factor that will convert them to whole numbers:

n(C):n(H):n(O) = 0.255 : 1 : 0.319

n(C):n(H):n(O) = 1 : 3.94 : 1.25

Round the mole ratios to the nearest whole number:

n(C):n(H):n(O) = 1 : 4 : 1

The empirical formula of the organic compound is CH4O, which is methanol.

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Answer:.

Explanation: Matter must have Mass and Volume to be considered matter!

The Average atomic mass of phosphorus is 29.9.

The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element.

Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.

An element can have differing numbers of neutrons in its nucleus, but it always has the same number of protons.

The versions of an element with different neutrons have different masses and are called isotopes.

The average atomic mass for an element is calculated by summing the masses of the element’s isotopes, each multiplied by its natural abundance on Earth i.e,

Average atomic mass of P = ∑(Isotope mass) (its abundance)

∴ Average atomic mass of P = (P-29 mass) (its abundance) + (P-30 mass)(its abundance) + (P-31 mass) (its abundance) + (P-33 mass) (its abundance)

Abundance of isotope = % of the isotope / 100.

∴ Average atomic mass of P = (29)(0.327) + (30)(0.4803) + (31)(0.184) + (33)(0.0087) = 29.88 a.m.u ≅ 29.9 a.m.u.

Hence , The Average atomic mass of phosphorus is 29.9.

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Answer:

Kindly check explanation

Explanation:

The force applied is directly proportional to the distance moved by an object, the larger the applied force, the greater the distance moved.

a = f/m

a = acceleration ; f = applied force ; m = mass

From the relation, we can see that acceleration is directly proportional to force applied.

The ball will travel farthest with the greatest applied force while, nearest distance will be attained with the smallest applied force.

The distance covered is affected by both the mass of the object and the applied force

Answer:

1.Begin energy in kilojoules.

2.Use a conversion factor in convert kilojoules to joules .

3.Use a conversion factor top convert

To calculate the molar mass of the molecule, we first need to find out what molecule it is. Since you have mentioned it contains both carbon and oxygen, it could be either carbon monoxide (CO) or carbon dioxide (CO2).

Assuming it is carbon dioxide, which is more commonly encountered, we can use the Ideal Gas Law to find the number of moles of CO2 in 1 liter at STP (Standard Temperature and Pressure, which is 0 degrees Celsius and 1 atm pressure).

The Ideal Gas Law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

At STP, the pressure is 1 atm, the volume is 1 liter, and the temperature is 273 K (0 degrees Celsius + 273).

So, we have:

PV = nRT

(1 atm)(1 L) = n(0.0821 L atm/mol K)(273 K)

n = 0.040 mol CO2

Now, we can calculate the mass of CO2 in 1 liter at STP using its density of 6.02 g/L:

mass = density x volume

mass = (6.02 g/L) x (1 L)

mass = 6.02 g

So, the molar mass of CO2 is:

molar mass = mass / number of moles

molar mass = 6.02 g / 0.040 mol

molar mass = 150.5 g/mol

Therefore, the molar mass of the carbon and oxygen molecule, assuming it is carbon dioxide, is 150.5 g/mol.

The total energy required to heat the water to the final temperature is 290,550.6 J.

The total energy required to heat the water to the final temperature is calculated as follows;

E = Q₁  + Q₂  + Q₃ + Q₄

E = mcΔθ + mf + mcΔθ₂ +  mLv

where;

The heat capacity of the water is calculated as;

E = 93 x 4.2 x (10)  +  334 x 93    +  93 x 4.2 x (121 - 0)  + 2240 x 93

E = 290,550.6 J

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Upon addition of iron, the equilibrium will shift toward forward according to Le Chatelier’s principle in the reaction 4 Fe (s) + 3 O\(_2\) (g) →2 Fe\(_2\)O\(_3\) (S)

Equilibrium is commonly characterized as a condition of rest in which no change occurs. A body in equilibrium will have no negative or positive energy exchanges.

The equilibrium state is defined differently in biology, physics, and chemistry. However, the underlying principle remains the same. External forces will have little effect on an organism that is in balance. Upon addition of iron, the equilibrium will shift toward forward according to Le Chatelier’s principle in the reaction 4 Fe (s) + 3 O\(_2\) (g) →2 Fe\(_2\)O\(_3\) (S)

Therefore, upon addition of iron, the equilibrium will shift towards forward according to Le Chatelier’s principle.

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Answer: Light, Chemical

Explanation: This is the answer because "photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water." - source https://opentextbc.ca/

In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

The process by that inexperienced plants and a few different organisms use daylight to synthesize nutrients from carbonic acid gas and water. chemical action in plants usually involves the inexperienced pigment and generates element as a by-product.

Photosynthesis may be a method employed by plants and different organisms to convert lightweight energy into energy that, through internal respiration, will later be discharged to fuel the organism's activities.

photosynthesis takes place in 2 stages: the light-dependent reactions and also the Calvin cycle. within the light-dependent reactions, that manifest itself at the thylakoid membrane, pigment absorbs energy from daylight and so converts it into energy with the employment of water.

Therefore, In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

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The concentration of all species, the pH of the solution, and the strongest base is respectively given as)

a

b)pH=3.88

c)ClO-

Question Parameters:

a 0.50 M solution of HOCl at 25℃. pKa = 7.46 at 25â„

Generally, the equation for the Chemical Reaction  is mathematically given as

HOCl=H30+ClO

Therefore

ka=\frac{H3O(ClO)}{HOCl}

Ka=10^{-7.46}

x.x/0.5-x=10^{-7.46}

x=1.317*10^{-4}

In conclusion

a)

the concentration HOCl

C_HOCl=0.5-1.137*10^{-4}

C_HOCl=0.5

the concentration H3O

C_H3O=1.137*10^{-7}

the concentration ClO

ClO=1.137*10^{-4}

b)

pH=-log(1.317*10^{-4})

pH=3.88

c)

The strongest base of the three is the

ClO-

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Answer:

4

Explanation:

there is a decimal place present. so you would take away any zeros before the number.

Answer:

4 i think

Explanation:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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To calculate the amount of money you would spend on gas in one week is 18.6065 euros.

Given the following data:

To calculate the amount of money you would spend on gas in one week:

First of all, we would calculate the total distance covered in one week:

Note: 1 week = 7 days.

\(Total\;distance = 7 \times 105\)

Total distance = 735 km.

Next, we would convert the value of distance in kilometers to miles:

Conversion:

1 km = 0.6214 miles

735 km = 456.708 miles.

Dividing by car's gas mileage, we have:

\(Distance=\frac{456.708}{27} \)

Distance = 16.915 miles.

For the cost:

\(Cost = 1.10 \times 16.915\)

Cost = 18.6065 euros.

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With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of glycerol, a phosphate group, and two fatty acid chains. Glycerol is a three-carbon molecule that functions as the backbone of these membrane lipids.

Explanation:

the principal components of plasma membrane are lipids phospholipid and cholesterol proteins and carbohydrates

Explanation:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability

Complete question:

Imagine a book that is falling from a shelf. At a particular moment during its fall, the book has a kinetic energy of 25 J.

What was the initial potential energy of the book, and what is its total kinetic energy at the instant just before it strikes the floor?

Answer:

the initial potential energy = 25 J

the total kinetic energy is 50 J

Explanation:

At any instant of fall the potential energy will be converted to kinetic energy.

At the instant when the kinetic energy is 25 J, the initial potential energy has been converted to 25 J

Thus, the initial potential energy = 25 J

The instant just before it strikes the floor, the potential energy has been converted to kinetic energy.

Total kinetic energy = 25 J + 25 J = 50 J

To solve such type of question we must be knowing the concept behind the ideal gas equation. The final pressure of the gas mixture after the addition of the Ar gas is 2.25 atm

Ideal gas equation is the mathematical expression that relates pressure volume, temperature and number of moles of gas

Mathematically,

PV=nRT

according to question T and V is constant

P ∝ n

P₁/n₁= P₂/n₂

Where

P₁ = initial pressure= 0.75atm

P₂ = Final pressure=?

n₁= number of moles of gas initially present=n

n₂ = Final moles of gas present=2n

Substituting into the given equation

P₂= P₁n₂/n₁

P₂ = 0.75atm ×2n/n

P₂ = 1.5 atm

The total pressure of the gas=partial pressure of N2 +  partial pressure after addition of Ar = 0.75 atm + 1.5 atm = 2.25 atm

The final pressure of the gas mixture after the addition of the Ar gas is 2.25 atm

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A hypothesis is a proposed explanation or prediction based on limited evidence or observations, which can be tested through further investigation or experimentation. It should be specific, testable, and based on existing knowledge.

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Answer:

I have the same thing

Explanation:

Answer:

I hope that help you

Explanation:

energy is change from one form to another called    _energy conversion

energy can neither be created nor destroyed it can only be transformed from one form to another called --The law of conservation of energy

cause to change in form character or function called - convert

the last sentensce

energy  transformation

The nucleus of an atom is positively charged and contains most of the mass if the atom.

An atom is the smallest particle of a an element that can take part in a chemical reaction.

Atoms are made up of other smaller sub-particles which are:

The protons and neutrons are found in the nucleus of an atom

The electrons are found regions around the nucleus.

Due to the positive charge of the protons, the nucleus of an atom are positively charged and is massive.

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