in the bohr model of the hydrogen atom, what is the de broglie wavelength for the electron when it is in the nn = 1 level?

Answer:

Assuming the element Magnesium atom is neutral

Proton #  = 12

Neutron # = 12

Electron # = 12

Explanation:

In a neutral atom the number of protons and electrons is always equal

The atomic number tells the number of protons (12) in this case

The Atomic Mass describes the mass of the protons + mass of neutrons, so if you take 12 (number of protons) away you are left with 12 and some change(number of neutrons)

Answer:

The linear sequence of amino acids within a protein is considered the primary structure of the protein. Proteins are built from a set of only twenty amino acids, each of which has a unique side chain. The side chains of amino acids have different chemistries.

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Answer:

O2• The rates of CO2 uptake and O2 evolution exhibit nearly identical responses to CO2 pressure within each species while the absolute rate of CO2 uptake appears to be slightly higher than the rate of O2 evolution at all CO2 pressures, giving a C02/02 exchange ratio of 1.04 to 1.14.

The rate of the reaction will also double and become 0.01068 m/s.

The Arrhenius equation can be used to determine the effect of temperature on reaction rates. A reaction's rate constant is related to temperature by the Arrhenius equation, which is as follows:

\(k = Ae^(^-^E^a^/^R^T^)\)

where: k = rate constant

A = frequency factor

e = base of natural logarithms (2.71828...)E

a = activation energy

R = gas constant (8.314 J/(mol K))

T = temperature (in Kelvin)

Since k is directly proportional to the rate of a reaction, we can use the equation to determine the effect of temperature on the rate of a reaction. Doubling the temperature will result in the following changes:

If the temperature is doubled, \(T_2 = 2T_1\)

The equation becomes:

\(k_2 = Ae^(^-^E^a^/^R^T^2)\)

We can now substitute 2T1 for T2:

\(k_2 = Ae^(^-^E^A^/^R^(^2^T1^)\)

Simplify:k2 = \(Ae^(^-^E^a^/^R^T^1) * e^(^-^E^a^/^R^T^1^)\)

\(k_2 = k_1 * e^(^-^E^a^/^R^T^1^) * e^(^-^E^a^/^R^T^1^)\)

\(k_2 = k_ 1* e^(^-^2^E^a^/^R^T^1^)\) So, the rate constant doubles if the temperature is doubled since \(e^(^-^2^E^a^/^R^T^1^)\) is positive.

Therefore, the rate of a standard reaction will be 0.00543 m/s x 2 = 0.01086 m/s if the temperature is doubled.

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In the second experiment, it would take 60 minutes to produce the same amount of product (25 mmol).

We can start by using the Michaelis-Menten equation to determine the initial reaction rate in the first experiment, where the substrate concentration is initially a thousand times greater than the KM:

v₀ = Vmax × [S]/(KM + [S])

Since the substrate concentration is initially a thousand times greater than the KM, we can assume that [S] >> KM, and simplify the equation to:

v₀ = Vmax × [S] / KM

The amount of substrate converted to product after 15 minutes is 1% of the initial substrate concentration, so the remaining substrate concentration is 99% of the initial concentration. Let's define [S]0 as the initial substrate concentration, then:

[S] = 0.99 [S]₀

The amount of product formed in 15 minutes is 25 mmol, so we can calculate the initial reaction rate as:

v₀ = (25 mmol / 15 min) / (0.01 mol / mol) = 1666.7 nmol/min

where we have converted the units to nmol/min and used the molecular weight of the product to convert from moles to millimoles.

Now, let's consider the second experiment, where one-fourth as much enzyme and twice as much substrate are used.

Since the amount of product formed is the same in both experiments, we can write:

v₁ × t₁ = v₂ × t₂

where v₁ and t₁ are the initial reaction rate and reaction time in the first experiment, and v₂ and t₂ are the corresponding values in the second experiment.

Let's use the Michaelis-Menten equation to relate the initial reaction rate to the enzyme and substrate concentrations:

v₁ = Vmax × [S]₁ / (KM + [S]₁) × E₁

v₂ = Vmax × [S]₂ / (KM + [S]₂) × E₂

We can rearrange these equations to solve for [S]1 and [S]2 in terms of v1, v₂, E₁, E₂, and KM:

[S]₁ = (v₁ × KM) / (Vmax × E₁) - [S]₂

[S]₂ = (v₂ × KM) / (Vmax × E₂) - [S]₁

Substituting these expressions into the equation for the reaction time, we get:

t₂ = (v₁ × t₁ × Vmax × E₂) / (v₂ × Vmax × E₁ + v₁ × E₂ × KM / (Vmax × E₁) - v₁ × KM / (Vmax × E₁))

Substituting the values from the first experiment, we get:

t₂ = (1666.7 nmol/min × 15 min × 1/4 × 2) / (1666.7 nmol/min × 1/2 × 1/1000 mol/L + 1666.7 nmol/min × 2 × 0.01 mol/L / (1/1000 mol/L) - 1666.7 nmol/min × 0.01 mol/L / (1/1000 mol/L))

Simplifying, we get:

t₂ = 60 min

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Answer:

\(\large \boxed{\text{0.88 L}}\)

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

\(p_{1}V_{1} = p_{2}V_{2}\)

Data:

\(\begin{array}{rcrrcl}p_{1}& =& \text{1.34 atm}\qquad & V_{1} &= & \text{ 0.56 L} \\p_{2}& =& \text{0.85 atm}\qquad & V_{2} &= & ?\\\end{array}\)

Calculations:  

\(\begin{array}{rcl}\text{1.34 atm} \times \text{0.56 L} & =& \text{0.85 atm} \times V_{2}\\\text{0.750 L} & = & 0.85V_{2}\\V_{2} & = &\dfrac{0.750}{0.85}\\\\& = &\textbf{0.88 L}\\\end{array}\\\text{The balloon's new volume is $ \large \boxed{\textbf{0.88 L}}$}\)

Answer:

yes

Explanation:

The correct equation for the decomposition of copper carbonate is:

CuCO3 → CuO + CO2

Fractional distillation is the process of distilling crude oil into distinct parts or fractions during the refinement process.

Refining is the process of dividing, removing impurities, and converting raw materials into products that may be used and adhere to strict quality standards.

A physical separation method known as fractional distillation makes use of the various components or fractions of crude oil's different boiling temperatures. The procedure involves vaporizing the crude oil in a fractionating column after it has been heated to a high temperature. Depending on the boiling points of the various components, the vapor cools and condenses at different heights as it ascends the column. The condensed liquids are gathered in various trays, each of which holds a percentage with a particular boiling point range and chemical make-up.

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The percent by mass of ki in this solution is 21.18%.

To find the percent by mass of ki in the solution, we need to divide the mass of ki by the total mass of the solution and multiply by 100.

Mass of ki = 15.8 g
Mass of water = 58.8 g
Total mass of solution = 15.8 g + 58.8 g = 74.6 g

Percent by mass of ki = (mass of ki/total mass of solution) x 100
= (15.8 g/74.6 g) x 100
= 21.18%

Mass is a Mass is a fundamental property of matter that measures the amount of material in an object. It is a scalar quantity that does not depend on the direction of measurement. Mass can be defined as the measure of the inertia of an object, which means how much resistance an object offers to a change in its state of motion.

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Answer: The ratio of radii of earth to another planet is 2/3 and the ratio of their mean densities is 4/5. If an astronaut can jump to a maximum height of 1.5 m on the earth, with the same effort, the maximum height he can jump on the planet is

Explanation:

The addition of sodium hydroxide and NaC₂H₃O₂ to water produces a buffer solution. Option a is correct.

A buffer solution is a solution that resists changes in pH when small amounts of an acid or a base are added to it. It contains a weak acid and its conjugate base (or a weak base and its conjugate acid) in approximately equal concentrations.

When sodium hydroxide (NaOH) is added to water, it dissociates completely to form hydroxide ions (OH⁻) and sodium ions (Na⁺):

NaOH → Na⁺ + OH⁻

When sodium acetate (NaC₂H₃O₂) is added to water, it also dissociates, but only partially, to form acetate ions (C₂H₃O₂⁻) and sodium ions (Na⁺):

NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻

The acetate ion acts as a weak base and can react with the hydroxide ion to form water and acetate hydroxide:

C₂H₃O₂⁻ + OH⁻ → HC₂H₃O₂ + H₂O

The weak acid, HC₂H₃O₂, formed by this reaction, can react with additional hydroxide ion to reform acetate ion and water:

HC₂H₃O₂ + OH⁻ → C₂H₃O₂⁻ + H₂O

Thus, the solution contains both the weak acid (HC₂H₃O₂) and its conjugate base (C₂H₃O₂⁻), which together act as a buffer and help to resist changes in pH when small amounts of an acid or a base are added to the solution. Option a is correct.

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Answer:  the formula of the molecule is CH₂O.

Explanation:

Based on the given information, let's determine the formula of the molecule.

Let's assign variables to represent the number of atoms of each element:

C = number of carbon atoms

H = number of hydrogen atoms

O = number of oxygen atoms

According to the information provided:

For every carbon atom, there are twice as many hydrogen atoms, so H = 2C.

The molecule has the same number of oxygen atoms as carbon atoms, so O = C.

Using these relationships, we can express the formula of the molecule:

C H₂Oₓ

The subscripts indicate the number of atoms for each element. Since the number of oxygen atoms is the same as the number of carbon atoms (C), we can simplify the formula to:

CH₂O

Answer:

white

Explanation:

Answer:

Answers are numbered below:

Explanation:

"The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division..."

I hope this helps you! Have a great day!

Egg whites are simply made frothy by adding air during the whipping process. It's a physical shift as they are still eggs whites—a material that has not changed. Yet in a chemical transformation.

To put it another way, a chemical always consists of the same "substance." There are some substances in nature, like water. Other chemicals, including chlorine, are produced

All of these things are made of chemicals, some organic and others manmade, including air, water, iron, fuel, clothes, stones, equipment, plastics, plants, and food. Chemicals can be made up of several distinct chemicals or they might be specific chemical molecule like water. Nitrogen, carbon, water, carbon dioxide, and other substances are all present in air.

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Answer:

tae hahahah joke lang hindi ko alam ehh

\(\\ \tt\hookrightarrow Density=\dfrac{Mass}{Volume}\)

\(\\ \tt\hookrightarrow Volume=\dfrac{Mass}{Density}\)

\(\\ \tt\hookrightarrow Volume\propto \dfrac{1}{Density}\)

Snow with density 0.25g/ml has more volume

The volume of snow with a density of  0.5 g/mL will have more water than the snow with a density of 0.25 g/mL.

Density is the mass per unit volume. Density can be calculated by knowing the mass and volume of the object. Volume is the space occupied by an object.

Let's take the volume to be 100

The densities are 0.5 g/mL and 0.25 g/mL

so, volume = mass / 0.5 g/ml

mass = 100 x 0.5 = 50

Second density =  0.25 g/mL

volume = mass / 0.25 g/ml

Mass = 100 x 0.25 = 25.

The mass is directly proportional to the density. So, if the mass has increased the density is also increased, so the volume of snow with a density of  0.5 g/mL will have more water than the snow with a density of 0.25 g/mL.

Thus, more water will be present in the amount of snow with a density of 0.5 g/mL than the snow with a density of 0.25 g/mL.

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Answer:

See explanation

Explanation:

Period 3 elements include; Na, Mg, Al, Si, P,S,Cl and Ar

Across the period, the chlorides of the elements change from solid to gas. The chlorides of metals are solid while the chlorides of non metals are gaseous.

Also, the chlorides become more volatile across the period. The formulas of the chlorides change from MCl to MCl2 to MCl3 to MCl4, MCl5 and MCl6 respectively across the period where M is a period 3 element.

The pH of the solutions of chlorides of period 3 elements change from neutral to acidic across the period. The pH of the chlorides of metals are neutral while the chlorides of the nonmetals usually yield acid solutions.

The molecular mass of the unknown compound found in the aqueous solution was 223.2g/mol

The sum of the atomic masses of all atoms in a molecule is called as molecular weight

So to get molar mass of the compound from the given weight the concentration of compound is elucidated and thereby leading to the calculation of molar mass

Then the concentration of solute in an aqueous solution can be derived from the osmotic pressure equation

So the osmotic pressure = van't hoff factor then the molarity of solute(M) gas constant(R) temprature(T)

From the given values in the question and applying constant values

8.44 torr = 1(for non electrolytes)× M×62.3637L⁻¹torr⁻¹mol⁻¹×298K

M = 4.54×10⁻⁴M

From the molarity of the given compound the molare mass can be calculated as

Molarity = weight/ molecular weight × 1000/volume(ml)

4.54×10⁻⁴M = 0..0152g/molecular weight × 1000/150ml)

Molecular weight = 223.2g/mol

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Answer:

please send the picture otherwise we won't be able to answer

Answer:

1) 0.4045nm

2) 0.0027096117g/cm³

Explanation:

1) Using the value of ionic radius of aluminum ion r=0.143 nm, the length of each edge of the unit cell can be calculated as what nm?

In the question above, using a face centered cubic structure, we have:

For a face centered site of the cube,

The diagonal = 4r

Where r =Atomic or ionic radius of Aluminum

Let the edge length of the cube be represented by X

Therefore, we have based on Pythagoras theorem,

X² + X² = (4r)²

2X² = 16r²

Divide both sides by 2

X² = 8r²

Find the square root of both sides

X = √8 × r

Since r = 0.143nm

The length of each edge of the unit cell can be calculated as

X = √8 × 0.143nm

X = 0.4044650788nm

Approximately = 0.4045nm

2) Using atomic weight value of aluminum 27.0, the density of aluminum can be calculated as what g/cm^3

Density of an object = Mass of the Object / Volume of the Object.

The object in this question = Cube

Step 1

Volume of a cube = (Length of the cube)³

In the question above, side length of the cube = 0.4045nm

When would convert 0.4045nm to centimeters

= 1 nm = 1 × 10^-7 cm

0.4045nm =

Cross multiply

= 4.045 × 10^-7 cm

Volume of the Aluminum cube =(4.045 × 10^-7cm)³

= 6.618439112 ×10^-20cm³

Step 2

The atomic weight value of aluminum is given as 27.0 in the question

A face centered cubic structure has 4 atoms per unit cell.

1 Atomic mass or weight value = 1.6605 × 10^-24 grams

Hence, the mass of Aluminum is calculated as:

(4 atoms /1 cell )× 1 unit × (27/ 1 atom of Aluminium) × (1.6605 × 10^-24g/ 1 Atomic mass value)

= 1.79334 ×10^-22g

Density = Mass/Volume

= 1.79334 ×10^ -22g /6.618439112 ×10^-20cm³

= 0.0027096117g/cm³

Most naturally occurring gases are a mixture. This statement is true about most naturally occurring gases.Gases are one of the four fundamental states of matter (solid, liquid, gas, and plasma). So correct answer is C

They are distinguished from other states by their ability to conform to the form of the container in which they are stored (assuming that the container is not entirely sealed). Gases are made up of tiny, discrete molecules that are spread out throughout a large volume, and these molecules can be subjected to an external force such as heat or pressure, which will cause the gas to compress or expand. These molecules do not interact with one another in the same way that liquids or solids do, as they are free to move and do not have a definite shape or volume.

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To obtain 200 mg of NaOCI for a reaction, you would need to add 2.5 ml of the 8.0% w/v solution.

The concentration of the NaOCI solution is given as 8.0% w/v, which means there are 8 grams of NaOCI in 100 ml of solution.

To determine the amount of the solution needed to obtain 200 mg of NaOCI, we can set up a proportion using the concentration and the desired amount.

First, we convert 8.0% w/v to grams/ml by considering that 8 grams of NaOCI are present in 100 ml of solution. This gives us 0.08 grams/ml.

Next, we set up the proportion:

0.08 grams/ml = 200 mg/x ml

To solve for x (the volume of the solution needed), we can cross-multiply and divide:

0.08x = 200 mg

x = 200 mg / 0.08 grams/ml

x = 2500 ml

Therefore, to obtain 200 mg of NaOCI, you would need to add 2.5 ml of the 8.0% w/v NaOCI solution. Therefore, the correct answer is 2.5 ml.

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Among the options listed, water is the base.

A base is a substance that has a high pH and can accept protons or donate hydroxide ions (OH-) in a chemical reaction. Water fits this definition as it has a neutral pH of 7, making it neither an acid nor a base. However, water can act as a base by accepting protons from strong acids to form hydronium ions (H3O+).On the other hand, hand soap is typically formulated to be slightly acidic, around pH 5.5 to 6.5, to match the skin's natural acidity. Gastric juices, such as stomach acid, are highly acidic with a pH ranging from 1 to 3, necessary for digestion.

Orange juice is also acidic, typically having a pH range of 3 to 4.5, due to the presence of citric acid.While water can exhibit both acidic and basic properties depending on the context, it is considered neutral in its pure form with a pH of 7. It can act as a base when reacting with stronger acids. Water's ability to dissociate into hydronium and hydroxide ions makes it amphoteric, meaning it can behave as both an acid and a base.

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Among the options provided, water (H2O) is considered a base.

According to the Bronsted-Lowry hypothesis, which categorizes bases as proton acceptors and acids as proton donors, water can function as a base by taking a proton to form the hydroxide ion (OH-), which is an anion. Pure water has a limited amount of water molecules that dissociate to form H+ and OH- ions, which creates a mildly basic solution.

Therefore, In some situations, water may be regarded as a base.

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Answer:

3p6 3d4

Explanation:

3d will come after 3p => 3p 3d

p will hold maximum of 6 electrons while d will hold maximum of 10 electrons.

if there are 8 more electrons to 3p2, then 4 will fill 3p so it will become 3p6

then the other 4 will fill 3d to become 3d4

To repeat problem 6 considering a dispersion number of 0.5 for the pond system, we need to use the graphs provided in the "effect of dispersion number" file.

The dispersion number is a dimensionless parameter that represents the ratio of the dispersion coefficient to the diffusivity coefficient. It is used to describe the level of mixing or spreading of a substance in a fluid system. In problem 6, we were asked to calculate the concentration of a substance in a pond system with a dispersion number of 0.1. Now, we need to repeat the calculation for a dispersion number of 0.5.

To calculate the concentration of the substance in the pond system with a dispersion number of 0.5, we need to follow the same steps as in problem 6, but using the appropriate graph from the "effect of dispersion number" file. We can start by determining the Peclet number, which is the ratio of the advection rate to the diffusion rate. Then, we can use the Peclet number to find the appropriate graph for the concentration profile. Finally, we can read off the concentration values from the graph and use them to calculate the average concentration in the pond system.

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