if the temperature of the gas sample is raised to 45.8 °c holding the volume constant, the average molecular speed will

Answer:

it is 8

Explanation:

The number of atoms of each element present in one unit of ammonium carbonate is found by multiplying each element in parenthesis by two. Thus, the total number of nitrogen atoms is 2, hydrogen is 8, carbon is 1, and oxygen is 3 in one unit of (NH4)2CO3 ( N H 4 ) 2 C O 3 .

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Answer: 8.754831

Explanation:

Answer: 8. 75 kilometers

Explanation:  5.44x 1.609344= 8.7548 Kilometers

The pH of the solution is 9.92,  The pH of a solution involves calculating the concentration of hydrogen ions in the solution

Sr(OH)2 (s) → Sr2+ (aq) + 2 OH- (aq)The next step is to calculate the concentration of hydroxide ions in the solution using the stoichiometry of the balanced equation. We are given that 1.03×10−6 moles of Sr(OH)2 are dissolved in 25.0 mL of solution, so we can use the following equation to calculate the concentration of hydroxide ions:[OH-] = 2 × (1.03×10−6 mol)/(0.0250 L) = 8.24×10−5 M

Finally, we can use the relationship between the concentration of hydroxide ions and the concentration of hydrogen ions in water to calculate the pH of the solution:pOH = -log[OH-] = -log(8.24×10−5) = 4.08pH = 14 - pOH = 14 - 4.08 = 9.92

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The balanced equation for this reaction can be written as follows: Mg + 2HCl → MgCl2 + H2

The reaction between magnesium (Mg) and hydrochloric acid (HCl) produces magnesium chloride (MgCl2) and hydrogen gas (H2).

Let's go through the process of balancing the equation step by step:

Write down the chemical formulas for the reactants and products.

Mg + HCl → MgCl2 + H2

Count the number of atoms for each element on both sides of the equation.

Left side: 1 Mg, 1 H

Right side: 1 Mg, 2 Cl, 2 H

Start balancing the equation by adjusting the coefficients.

Since there is one Mg atom on each side, the coefficient for Mg remains 1.

Now, let's balance the hydrogen atoms. There are two H atoms on the right side but only one on the left side. To balance them, we need to place a coefficient of 2 in front of HCl.

Mg + 2HCl → MgCl2 + H2

Now, check the chlorine atoms. There are two Cl atoms on the right side, which means we need two HCl molecules to provide enough Cl atoms. So, the equation is already balanced in terms of chlorine.

Double-check all the atoms to ensure the equation is balanced:

Left side: 1 Mg, 2 H, 2 Cl

Right side: 1 Mg, 2 Cl, 2 H

The equation is now balanced, with the same number of atoms on both sides.

Thus, the balanced equation for the reaction between magnesium and hydrochloric acid is:

Mg + 2HCl → MgCl2 + H2

In this reaction, magnesium displaces hydrogen from hydrochloric acid, resulting in the formation of magnesium chloride and the evolution of hydrogen gas. It is a classic example of a metal-acid reaction and is often observed in chemistry demonstrations due to the effervescence of hydrogen gas.

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The balanced half-reaction describing the reduction of solid diiodine (I2) to aqueous iodide anions (I-) can be represented as follows:

I2 + 2e- -> 2I-

In this half-reaction, two electrons (2e-) are added to diiodine (I2), resulting in the formation of two iodide anions (2I-). This reduction process involves the gain of electrons by diiodine, leading to the conversion of neutral diiodine molecules to negatively charged iodide ions.

The balanced equation illustrates that for every molecule of diiodine (I2) reduced, two iodide anions (I-) are formed. The transfer of electrons from the reducing agent (in this case, the diiodine) to the oxidizing agent results in the formation of the reduced species (iodide ions).

It is important to note that this is only a half-reaction, and the overall redox reaction would require a corresponding oxidation half-reaction to complete the balanced equation. The reduction half-reaction described above represents the reduction of diiodine to iodide ions.

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It is not possible for two electrons to have the same set of all four quantum numbers in an atom, as it would violate the Pauli exclusion principle.

According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. The four quantum numbers used to describe an electron's state are the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

The principal quantum number (n) determines the energy level of an electron and can have integer values starting from 1. The azimuthal quantum number (l) determines the shape of the electron's orbital and can have values from 0 to (n-1). The magnetic quantum number (m) determines the orientation of the orbital and can range from -l to +l. The spin quantum number (s) describes the spin of the electron and can have two possible values, +1/2 or -1/2.

Since each electron in an atom must occupy a unique set of quantum numbers, they must differ in at least one of the four quantum numbers. This ensures that no two electrons have the exact same quantum state.

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The compound with the most nucleophilic conjugate base in diethyl ether with a different nucleophile than NaI would be option D. HF (pKa = 3.2).

To determine which compound would have the most nucleophilic conjugate base in diethyl ether with a different nucleophile than NaI, we need to consider the stability of the conjugate bases. The stability of a conjugate base can be inferred from the acidity of the corresponding compound.

The acidity of a compound is determined by the stability of its conjugate base. The more stable the conjugate base, the weaker the acid. Therefore, the compound with the highest pKa value will have the most stable conjugate base and, consequently, the least nucleophilic conjugate base.

In this case, option D. HF (pKa = 3.2) has the lowest pKa value, indicating that it is the strongest acid and has the least stable conjugate base. Therefore, the conjugate base of HF would be the most nucleophilic among the given compounds.

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The formula for the time (t) it will take for perfume molecules to diffuse a distance (l) into the room can be derived as follows: t = (l^2) / (6D), where D is the diffusion coefficient.

Diffusion is the process by which molecules spread out from an area of high concentration to an area of low concentration. In this case, we are considering the diffusion of perfume molecules into the room. To derive a formula for the time it takes for diffusion to occur, we need to consider the factors that affect the rate of diffusion.

The time it takes for molecules to diffuse a distance (l) can be related to the diffusion coefficient (D), which is a measure of how quickly molecules move and spread out. The formula for the time (t) can be derived using the equation t = (l^2) / (6D), where (l^2) represents the squared distance traveled and 6D represents the diffusion coefficient.

The diffusion coefficient depends on various factors, including the mass (m) and collision cross-section (σ) of the perfume molecules, as well as the pressure (p) and temperature (t) of the environment. By assuming that the mass and collision cross-section of the perfume molecules are similar to air molecules, we can consider them to be constant in the formula.

It's important to note that this derived formula is a simplification and assumes ideal conditions. Real-world diffusion processes may involve additional factors and complexities. However, the derived formula provides a starting point for understanding the relationship between diffusion time, distance, and the diffusion coefficient.

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Answer:

20

Explanation:

Hi there!

We need to find the atomic number of an atom that has 20 protons and 20 neutrons

the atomic number of an atom is equivalent to the amount of protons an atom has, as the number of protons determines what element an atom is.

Since the atom has 20 protons, the atomic number of the said atom is 20

Hope this helps!  

Answer: Example: The water in a species envirmoent suddenly becomes more acid therefore, the species adapts it's body to become more resistent and tolerate to chemicals.

This might also give it an adavantage to the species who have not yet adapted to the change

Explanation: There are three type of adaptions. 1) Structural 2) Behavioral 3) Physiological

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(Density = \frac{mass}{volume} \)

From the question

mass = 67 g

Volume of ring = new volume of water - original volume of water

Volume = 13.47 - 10 = 3.47 mL

Substitute the values into the above formula and solve

That's

\(Density = \frac{67}{3.47} \\ = 19.308357\)

We have the final answer as

Hope this helps you

Explanation:

Density is an intensive property because there is a narrow range of densities across the samples. No matter what the initial mass was, densities were essentially the same. Since intensive properties do not depend on the amount of material, the data indicate that density is an intensive property of matter.

The grocer's power output is 60 Watts. Power is measured in Watts, which represents the rate of energy transfer or work done per unit time.

Power is defined as the rate at which work is done or energy is transferred. It can be calculated using the formula: Power = Work / Time.

In this case, the work done by the grocer is equal to the force applied multiplied by the distance moved. The force applied is 100 N and the distance moved is 1.5 m, so the work done is:

Work = Force * Distance

Work = 100 N * 1.5 m

Work = 150 Joules

The time taken to perform the work is 2.5 seconds. Now we can calculate the power output:

Power = Work / Time

Power = 150 Joules / 2.5 seconds

Power = 60 Watts

Therefore, the grocer's power output is 60 Watts. Power is measured in Watts, which represents the rate of energy transfer or work done per unit time. It indicates how quickly the grocer is able to lift the crate of apples to the shelf.

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Answer:

5.77x10^-7 m or 577 nm (nanometers)

Explanation:

The wavelength, λ, and frequency, ν, of light are described by the equation:

c = λν

where c is the speed of light.  

c = 3.0x10^8 m/s

v = 5.2x10^14

λ = c/v

λ = (3.0x10^8 m/s)/(5.2x10^14) = 5.77x10^-7 m

since 1 m = 10^9nm, we can express this as 577 nm (nanometers)

577 nm.  This is in the yellow light span of wavelengths.

To prepare 10.0 ml of a 0.25% m/v HCl solution, you will need to mix 2.5 ml of 1% m/v HCl solution with 7.5 ml of distilled water.

To make 10.0 ml of a 0.25% m/v HCl solution from 1% m/v HCl, dilute the 1% m/v HCl solution by a factor of 4.

Here's how to figure out how much 1% m/v HCl and distilled water you'll need:

Determine the concentration of HCl in the final solution:

A 0.25% m/v HCl solution contains 0.25 grams of HCl per 100 mL. 

As a result, there will be 0.25 g/100 ml x 10 ml = 0.025 g of HCl in 10 ml of solution.

Determine the quantity of 1% m/v HCl required:

1% m/v HCl implies that there is one gram of HCl in every 100 ml of solution. You will need the following to make 0.025 g of HCl:

0.025 g/1 g x 100 ml = 2.5 ml of 1% m/v HCl solution

Determine the amount of distilled water required:

To prepare the remaining 7.5 ml of solution, use the following :

10 ml - 2.5 ml = 7.5 ml of distilled water

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The required heat in BTU, for the water at 50°C to become ice at -50°C is 209 BTU/lb.

To determine the required heat in BTU, for the water at 50°C to become ice at -50°C, we need to calculate the heat of fusion and the heat of cooling of water. We can use the following formula to calculate the required heat.

Q = mL

Where:Q is the required heat in BTU.

m is the mass of water in pounds.L is the specific heat of water at the desired temperature.

Lf is the heat of fusion of water.

Lc is the specific heat of ice.

Using the above formula, we get;

Q = mLf + mL + mLc

The heat of fusion of water is 144 BTU/lb

The specific heat of water at 50°C is 1.00 BTU/lb °F.

The specific heat of ice is 0.5 BTU/lb°F.

We know that: 1°C = 1.8°F.

So,50°C = 122°F and -50°C = -58°F

Also, the mass of water is not given, so let us assume that the mass of water is 1 lb.

Thus;

Q = mLf + mL + mLc

Q = 1(144) + 1(1.00)(122-32) + 1(0.5)(-50-0)

Q = 144 + 90 + (-25)

Q = 209 BTU/lb

Therefore, the required heat in BTU, for the water at 50°C to become ice at -50°C is 209 BTU/lb.

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Answer:

There are 6 oxygen atoms.

Explanation:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.

hope this helps

The molecular formula of glucose is C₆H₁₂O₆, therefore one molecule of glucose has six oxygen atoms.

A chemical formula is a way of representing information about the chemical proportions of atoms of each element that are present in a molecule or chemical compound. The chemical formula can be written by using chemical symbols, numbers, and other symbols, such as commas, dashes, brackets, and plus (+) and minus (−) signs.

A chemical formula of a compound contains no words but can represent certain simple chemical structures. Chemical formulae are usually more limited in power than structural formulae and chemical names. There are two types of chemical formulas one empirical formula and another molecular formula.

In a molecular formula, more than one atom of the same element can be represented by subscripts. The given formula of glucose is C₆H₁₂O₆ and the total number of oxygen atoms in the formula is equal to six.

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In a sample of ground beef, there were 18.9% protein and 21.4% fat, both expressed in mass. Therefore, 125g of ground beef has 147.5 kilocalories.

The now-defunct kinetic theory of heat served as the basis for the calorie, a unit of energy. For historical reasons, the term "calorie" has two main definitions that are often employed.

Originally, the amount of heat needed to raise the temperature of one kg of water by one degree Celsius was referred to as a large calorie, dinner calorie, dietary nutrient, and kilo calorie (or one kelvin). A minuscule calorie or tiny calorie is the term used to describe the quantity of heat needed to produce the same increase in one kilogram of water.

The needed number of calories for ground beef is m.

protein in it = .18m

fat in it =  .21m

1 gram of protein gives 4 cals .

1 gram of fat gives 9 cals .

4 x .18m  + 9 x  .21m = 350

m = 147.5kilocalories

Therefore, 125g of ground beef has 147.5 kilocalories.

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Answer:

When the moon moves between the sun for solar eclipse

When the earth moves between the sun and moon

(Extremely sorry if im wrong)

Explanation:

Answer:

D A and B that is the answer

i) KMnO4

lets calculate using x method

1+x+ 4(-2) = 0

1+x-8 =0

x= 7

ii)MnO4‐

x+4(-2) = -1

x-8 = -1

x = 7

Answer: The answer is B. The pressure inside the tires increased.

Explanation:

The relationship between the pressure, volume, and temperature of a gas is described by the ideal gas law, which is usually written as:

\($$PV = nRT$$\)

where:

- \(\(P\)\) is the pressure,

- \(\(V\)\) is the volume,

- \(\(n\)\) is the number of moles of gas,

- \(\(R\)\) is the ideal gas constant, and

- \(\(T\)\) is the temperature (in Kelvin).

In this case, the volume \(\(V\)\) and the number of moles \(\(n\)\) of air in the tires stay the same. The temperature \(\(T\)\) is increasing. Therefore, for the equation to remain balanced, the pressure \(\(P\)\) must also increase.

So, the answer is B. The pressure inside the tires increased.

Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements