WILL GIVE BRAINLIEST how many moles are in 1.42x10^22 molecules of AlCl3?
3 is a subscript.

Answer:

In the Bohr model, electrons can exist only in certain energy levels surrounding the atom.

When electrons jump from a higher energy level to a lower one, they emit light at a wavelength that corresponds to the energy difference between the levels.

The energy levels in each atom are unique.

Explanation:

Be sure to put in your own words.

Edge 2020

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The question is incomplete, the complete question is;

Scientists made the following two observations about emission spectra:

Each element has a unique emission spectrum.

Atoms emit energy only at specific wavelengths.

Describe how the Bohr model explains both of these observations.

Bohr model of the atom proposed that electrons in atoms were found in specific orbits known as energy levels. Atomic spectra results from when electrons transit between energy levels.

The Bohr model of the atom incorporated the idea of energy quantization into the atomic theory. The energy levels within the atom, according to this theory, is quantized.

This means that electrons can only have positive integer values of energy.

Since the atoms of each element has a unique arrangement of electrons in their orbits, atoms of various elements must have a unique(signature) emission spectrum generated by electronic transitions within the atoms according to Bohr's theory.

Also, emission or absorption of energy occurs at specific wavelengths because energy levels within the atom are quantized.

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Answer:

b

Explanation:

Answer:

Explanation:

because

Neon and Krypton, both are belongs to Inert or Noble gas Group

Ribonucleotide reductase is an enzyme that catalyzes the substitution of hydrogen for the ribonucleotide hydroxyl group at position C2.

The best choice is A.

Usually, catalyzed reactions are employed to quicken the rate at which a certain chemistry develops. The catalyst's main function is to give the reaction a another, lower-energy pathway. The catalyst reacts with a reactant to create an intermediate product, which causes this to happen.

Homogeneous catalysis is one of three forms of catalysis, which are classified according to the nature and physical condition of the substances used in the chemical reaction. Differential catalysis Autocatalysis.

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I understand the question you are looking for is :

The replacement of ribonucleotide hydroxyl group at C2 with hydrogen is catalyzed by enzyme ________.

A) Ribonucleotide reductase

B) Ribonucleotide oxidase

C) Ribonucleotide transcarboxylase

D) Ribonucleotide decarboxylase

Answer:

aluminum - 3,argon - 3,sodium - 3

Explanation:

a substance that can’t be broken down into another substance.

Answer:

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

a. displacement = 6 km

b. velocity = 4 km/h

Given

a morning paper route

Required

displacement

velocity

Solution

Displacement is a vector quantity that shows changes in the position of objects in a certain interval of time. Displacement has magnitude and direction

Can be simplified displacement = distanced traveled from starting point to ending point

a. Since we only consider the starting point and the end point, we just need to add up the distances to the north

3 km + 3 km = 6 km

b. Velocity = displacement changes with time

\(\tt v=\dfrac{d}{t}=\dfrac{6~km}{1.5}=4~km/h\)

Explanation:

The reaction between an acid and a base is known as a neutralisation reaction.

Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...

Physical state of the reactants and surface area. ...

Temperature. ...

Presence of a catalyst.

ammonia

An alkaline gas which produces dense white fumes when reacted with HCl gas is ammonia and fumes are of compound ammonium chloride.

BRAINILIEST PLEASE

Answer:

C = q / m x dT

Explanation:

By definition, specific heat, C = heat absorbed, q divided by mass, m and change in temperature, dT

So C = q / m x dT

Answer:

The specific heat capacity of a material is the energy required to raise one kilogram (kg) of the material by one degree Celsius (°C)

Formula:

energy (J) = mass (kg) * specific heat capacity (J/kg°C ) * change in temperature

required answer:

using the formula:

C =   \(\frac{102}{12.5*(55-22)}\)

C = 0.2473 J/kg°C

             ↑

This is the specific heat capacity of copper

When the enthalpy of solution (∆hsolution) is zero, it means that no energy is required to dissolve the solute in the solvent.

This is favorable for the formation of a solution because it indicates that the solute and solvent have similar intermolecular forces and can mix together easily.

If ∆hsolution is positive, it means that energy is required to break the solute-solute and solvent-solvent interactions and create solute-solvent interactions.

This makes the process less favorable and requires more energy input. On the other hand, if ∆hsolution is negative, it means that energy is released during the formation of solute-solvent interactions.

This can be favorable for the formation of a solution, but it also depends on the magnitude of the negative value. Overall, a ∆hsolution of zero suggests that the solute and solvent can easily mix together and form a solution without requiring additional energy.

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Answer:

ammonium chloride

Explanation:

Because NH is ammonium and Cl is chlorine

Answer: 2Cr + 3Br2 Yields 3CrBr3

Explanation:

We know that 4a is not balanced because there are 3 Nitrogen atoms on the reactants side and 2 on the products side.

We know that 4c is not balanced because there are 4 Chlorine atoms on the reactants side and 2 on the products side. (Remember there are 2 Cl2 atoms. Therefore, 2 times 2 means there are 4 Chlorine atoms on the reactants side)

Finally, we know the answer is not 4d because there is 1 Potassium on the reactants side and 2 potassiums on the products side.

Therefore, the answer must be 4b, which contains 2 Chromium atoms and 6 bromine atoms on each side

A water surplus occurs when additional water exists after potential evapotranspiration is satisfied by precipitation inputs.Correct option is  C.

A) It occurs when the additional inputs of water into a system are not enough to satisfy potential evapotranspiration.

This option describes a water deficit rather than a water surplus. A water deficit occurs when there is not enough water input to meet the potential evapotranspiration demand.

B) It occurs when the potential evapotranspiration demand cannot be satisfied by precipitation inputs.

This option also describes a water deficit rather than a water surplus. It means that the demand for potential evapotranspiration is not met by the amount of precipitation available.

C) It occurs when additional water exists after potential evapotranspiration is satisfied by precipitation inputs.

This option accurately describes a water surplus. It means that there is excess water available after the potential evapotranspiration demand has been met by precipitation.

D) It occurs when potential evapotranspiration is greater than soil moisture.

This option describes a water deficit rather than a water surplus. If potential evapotranspiration is greater than soil moisture, it means there is not enough water available to meet the evapotranspiration demand.

Therefore, the correct answer is option C. A water surplus occurs when additional water exists after potential evapotranspiration is satisfied by precipitation inputs.

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Answer:

solids have definite shape and definite volume

Answer: NUmber 3

Explanation:

p.s. i have same laptop

Answer:

5 would be the large intestine

Explanation:

Answer:

0.715 g

Explanation:

mass = 0.0013x550= 0.715 g

Answer:

the answer for this one is the distance the car is driven

At 320 K, 2.50 L of HF gas containing 1.35 moles exerts a pressure of 14.2 atm. Therefore, choice C is the right one.

An ideal gas is one in which there aren't any intermolecular attractive forces and all atom-to-atom or molecule-to-molecule collisions are entirely elastic. This equation of state connects a gas's volume, pressure,  temperature, and mass. Then, the equation is written as PV=nRT where pressure is denoted by P, the number of moles is denoted by n, volume is denoted by V, and temperature is denoted by T.

Given V=2.50 L, T=230 K, and n=1.35 moles. We know that, R=0.0821 L atm/mol K. Then, the pressure of the given HF gas is calculated as follows,

\(\begin{aligned}P_{\mathrm{HF}}&=\frac{nRT}{V}\\&=\mathrm{\frac{1.35\;moles\times0.0821 \;L\;atm\;mol^{-1}\;K^{-1}\times 320 \;K}{2.5\;L}}\\&=\mathrm{14.19\;atm}\\&=\mathrm{14.2\;atm}\end{aligned}\)

The required answer is 14. 2 atm.

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Answer: they help advance by being able to see clearly and being able reduce its seeing

Explanation:

Answer:

true

Explanation:

The factor most sensitive to changes in temperature is the thermal expansion coefficient of a material.

In physics, the sensitivity of a factor to changes in temperature is determined by its thermal expansion coefficient. The thermal expansion coefficient measures how much a material expands or contracts when its temperature changes. Different materials have different thermal expansion coefficients, which determine their sensitivity to temperature changes.

For example, solids generally expand when heated and contract when cooled. This is because the atoms or molecules in a solid vibrate more vigorously as the temperature increases, causing them to move further apart and the material to expand. Conversely, when the temperature decreases, the atoms or molecules vibrate less, causing the material to contract.

Gases, on the other hand, are highly sensitive to changes in temperature. When a gas is heated, its molecules move faster and collide more frequently, leading to an increase in pressure and volume. As a result, gases expand significantly with temperature increases. Conversely, when a gas is cooled, its molecules move slower and collide less frequently, leading to a decrease in pressure and volume.

Liquids also expand with temperature, but to a lesser extent than gases. The expansion of liquids is due to the increased kinetic energy of their molecules, which causes them to move further apart. However, the intermolecular forces in liquids are stronger than in gases, limiting their expansion.

Understanding the thermal expansion properties of materials is important in various fields. For example, in engineering and construction, knowledge of thermal expansion helps prevent structural damage caused by temperature changes. In manufacturing, it is crucial for designing and producing components that can withstand temperature variations without failure.

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The factor that is most sensitive to changes in temperature is the enzyme activity or enzymatic reactions.

What is an enzyme?

An enzyme is a biomolecule that is a catalyzer in various biological and chemical processes, accelerating the rate of a chemical reaction without itself being affected.

What is the effect of temperature on enzymes?

Temperature affects enzyme activity by modifying the enzyme's three-dimensional shape, leading to a higher rate of reaction until a particular temperature is reached, after which the reaction rate begins to decrease, resulting in enzyme denaturation and a decrease in enzyme activity.

Factors that affect enzyme activity are:

Temperature: Enzyme activity is highly influenced by temperature, with the optimal temperature for enzyme activity generally ranging from 30°C to 40°C, depending on the enzyme's origin. When the temperature is lowered, the enzyme activity slows down until it ceases to function, resulting in a decrease in the rate of reaction. The rate of reaction increases with increasing temperature until it reaches the maximum point at which the enzyme becomes denatured and stops functioning. Therefore, enzymes are the most temperature-sensitive factor.

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Answer:

The RMM of Ca (OH)2 is

40+ (16+1)2

40+(17)2

40+34

74

The RMM of Al2SO4 is

(27×2)+32+(16×4)

54+32+64

=150

Explanation:

Note that the RAM of:

Ca=40

O=16

H=1

Al=27

S=32

Answer:

The force factors are equal to the first numbers of the products of the masses in scientific notation.

Explanation:

Ex. 1.0 x 10^5 kg^2 then the force factor would be 1.

ex. 3.0 x 10^12 kg^2 then the force factor would be 3.

To solve this we must be knowing each and every concept related to  scientific notation and its calculations. Therefore, in scientific notation, the force factors seem to be equivalent to the first digits of the masses' products.

Mathematics is a way of representing numbers using a decimal number ranging from one to 10, but not 10 multiplied by a factor of 10. The most common type of mathematical notation is All numbers in scientific notation are expressed in the generic form N 10m.

In scientific notation, the force factors seem to be equivalent to the first digits of the masses' products.

Example1 1.0 x 10⁵ kg² , force factor is 1.

Example2 3.0 x 10¹² kg² ,force factor is 3.

Therefore, in scientific notation, the force factors seem to be equivalent to the first digits of the masses' products.

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The strong acid and strong base has high rate constant of dissociation. The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, no, acid would not remain acid  if the positions of electrons and protons were swapped.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. No, acid would not remain acid  if the positions of electrons and protons were swapped.

Therefore, no, acid would not remain acid  if the positions of electrons and protons were swapped.

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Unit conversion is a common mathematical technique used in chemistry to convert between different units of measurement.

In this experiment, the measured length of the lab book in inches can be converted to centimeters and millimeters using the following conversion factors:

1 inch = 2.54 centimeters

1 inch = 25.4 millimeters

To convert the length from inches to centimeters, you can multiply the measured length in inches by the conversion factor of 2.54:

Length in centimeters = Length in inches * 2.54

Similarly, to convert the length from inches to millimeters, you can multiply the measured length in inches by the conversion factor of 25.4:

Length in millimeters = Length in inches * 25.4

By applying these conversion factors, you can accurately convert the measured length of the lab book from inches to centimeters and millimeters, enabling easier comparison and analysis of the data in the context of the experiment.

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The 3.211 grams of helium are needed to inflate the balloon.

To calculate the number of moles of helium in the balloon, we can use the Ideal Gas Law:

PV = nRT

where P is the pressure in atmospheres, V is the volume in liters, n is the number of moles, R is the ideal gas constant (0.08206 L atm/(mol K)), and T is the temperature in Kelvin.

First, we need to convert the volume from dm3 to liters:

18 dm3 = 18 L

We also eed to convert the temperature at room temperature from Celsius to Kelvin:

T = 273 + 25 = 298 K

Now we can plug in the values and solve for n:

(1.05 atm) (18 L) = n (0.08206 L atm/(mol K)) (298 K)

n = (1.05 atm * 18 L) / (0.08206 L atm/(mol K) * 298 K)

n = 0.802 mol

Therefore, there are approximately 0.802 moles of helium in the balloon.

To calculate the mass of helium needed to inflate the balloon, we can use the molar mass of helium and the number of moles:

Molar mass of helium (He) = 4.003 g/mol

mass of helium = n * Molar mass of helium

mass of helium = 0.802 mol * 4.003 g/mol

mass of helium = 3.211 g

3.211 grams of helium are needed to inflate the balloon.

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3H₂(g)+N₂(g)——> 2NH₃ (g) , here the volume of NH₃(g) measured at STP is produced when 2.15 L of H₂(g) reacts is approximately 1.58 L of NH₃ gas will be produced when 2.15 L of H₂ reacts at STP.

3H₂(g) + N₂(g) → 2NH₃ (g)

3 moles of H₂ reacts to produce 2 moles of NH3. Therefore, one need to first calculate the number of moles of H₂ in 2.15 L.

PV = nRT

P= is the pressure (STP has a pressure of 1 atm), V =is the volume in liters, n is the number of moles, R= is the ideal gas constant (0.0821 L·atm/mol·K), T =is the temperature in Kelvin (STP has a temperature of 273 K).

Here, 

n(H₂) = (P(H₂) × V(H₂)) / (R × T)

Assuming the pressure of H₂ is also 1 atm at STP, and substituting the values:

n(H₂) = (1 atm × 2.15 L) / (0.0821 L·atm/mol·K × 273 K) n(H₂) ≈ 0.0954 mol

According to the balanced equation, 3 moles of H₂ react to produce 2 moles of NH3. Therefore, one can determine the number of moles of NH₃ produced:

n(NH₃ ) = (2/3) × n(H₂) n(NH₃ )

≈ (2/3) × 0.0954 mol n(NH₃ )

≈ 0.0636 mol

V(NH₃ ) = (n(NH₃  × R × T) / P(STP)

Substituting the values:

V(NH₃ ) = (0.0636 mol × 0.0821 L·atm/mol·K × 273 K) / (1 atm) V(NH₃ )

≈ 1.58 L

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Answer:

1.7x10g per 100cc

Explanation:

The solubility product of Caf, at 25 °C is about X x 10-11 mol/L.

The molarity of an aqueous solution is found to be 0.352 mol/L.

What is molarity?

Molarity is a unit of concentration that is commonly used in chemistry, and it is defined as the number of moles of solute per liter of solution. It is symbolized by the letter "M" and is used to measure the amount of a solute that is present in a solution. Molarity is an important concept in chemistry, and it can be used to calculate the amount of a substance that needs to be added to a solution to reach a set concentration, as well as to figure out the amount of a substance that is already present in a solution. Molarity is also used to measure the concentration of acids and bases, as well as to determine the rate of chemical reactions.

No. of moles =25/ 142.05 =0.176
given volume of solution = 500mL
M= (0.176/500) × 100= 0.352 mol/L
Hence, Molarity is 0.352 mol/L.

For detailed solution check attached file.

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