The density of water is 1g/cm3. What might be the density of an object that floats in water

The term mole concept is used here to determine the moles of ammonia. The number of moles of ammonia which can be make from 6.20 moles of N₂ is 12.4.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

You need one nitrogen atom to produce ammonia. Here we can see that there are two nitrogen atoms in N₂.

One mole of any substance contains Avogadro number of molecules. A mole is defined as the mass of the substance which consists of the equal quantity of basic units.

The number of moles of ammonia from 6.20 moles of N₂ is:

6.20 × 2 = 12.4

Thus the number of moles is 12.4.

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The resulting volume of the gas is approximately 2.14 m^3.

According to Boyle's Law, when the temperature of a gas remains constant, the product of its pressure and volume is constant. Mathematically, P1 * V1 = P2 * V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.

Given:

Initial volume (V1) = 5 m^3

Initial pressure (P1) = 300 kPa

Final pressure (P2) = 700 kPa

Rearranging the Boyle's Law equation to solve for the final volume (V2), we get:

V2 = (P1 * V1) / P2

Substituting the given values into the equation, we find:

V2 = (300 kPa * 5 \(m^3\)) / 700 kPa

Evaluating the expression, the resulting volume of the gas is approximately 2.14 \(m^3\).

Therefore, when the temperature remains unchanged, the resulting volume of the gas is approximately 2.14\(m^3\).

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1. Cl (chlorine) - smallest
2. Na (sodium)
3. Mg (magnesium)
4. K (potassium)
5. Rb (rubidium) - largest

Hi! I'm happy to help you rank these elements according to the radii of their atoms from smallest to largest. The elements you've provided are Na (sodium), Mg (magnesium), Cl (chlorine), K (potassium), and Rb (rubidium).

The ranking based on atomic radii is as follows:

1. Cl (chlorine) - smallest
2. Na (sodium)
3. Mg (magnesium)
4. K (potassium)
5. Rb (rubidium) - largest

This ranking considers the general trend in the periodic table where atomic radii increase as you move down a group and decrease as you move from left to right across a period.

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Answer: B volume

Explanation: that tool is used to measure volume or liquid

Answer:

B. Volume

Explanation:

test

The balanced chemical equation for the reaction between a weak acid, HClO₂, and a strong base, Ba(OH)₂, is:

2 HClO₂(aq) + Ba(OH)₂(aq) → Ba(ClO₂)₂(aq) + 2 H₂O(l)

The balanced chemical equation for the reaction between a weak acid, HClO₂, and a strong base, Ba(OH)₂, is:

2 HClO₂(aq) + Ba(OH)₂(aq) → Ba(ClO₂)₂(aq) + 2 H₂O(l)

In this reaction, the Ba(OH)₂ dissociates completely into Ba²⁺ and 2 OH⁻ ions in solution. The HClO₂ is a weak acid and therefore only partially dissociates into H⁺ and ClO₂⁻ ions in solution. The reaction between these ions forms Ba(ClO₂)₂, a salt, and water.
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The total change in entropy for the refrigerant is approximately -0.332 kJ/kgK. Note that the negative sign indicates a decrease in entropy, which is expected for a process where the refrigerant is compressed.

To find the total change in entropy for the refrigerant, we can use the formula:

ΔS = Cp ln(T2/T1) - R ln(P2/P1)

Where ΔS is the change in entropy, Cp is the specific heat capacity at constant pressure, R is the gas constant, T1 and T2 are the initial and final temperatures, and P1 and P2 are the initial and final pressures.

First, we need to determine the specific enthalpy at the initial and final states using a refrigerant table. From the table, we find that the specific enthalpy of refrigerant 134a at 100 kPa and 0°C is 72.45 kJ/kg, and at 400 kPa and 80°C is 338.15 kJ/kg.

Next, we need to determine the specific heat capacity at constant pressure. From the table, we find that the specific heat capacity at constant pressure (Cp) of refrigerant 134a is approximately 1.16 kJ/kgK.

Now we can substitute the values into the formula:

ΔS = Cp ln(T2/T1) - R ln(P2/P1)

ΔS = 1.16 ln(353.15/273.15) - 8.314 ln(400/100)

ΔS = 1.16 (0.287) - 8.314 (1.386)

ΔS = -0.332 kJ/kgK

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The best-favored alkyl halide for Williamson ether synthesis is typically a primary alkyl halide. Therefore, option A (1-chloro-2 methylpropane) would be the best choice.

However, it is important to note that the specific reaction conditions and desired product may also play a role in determining the most favorable alkyl halide. For Williamson ether synthesis, the best favored alkyl halide is one that has minimal steric hindrance and less chance of competing elimination reactions. Among the options given, B. 2-chlorobutane is the most favored alkyl halide for Williamson ether synthesis, as it has a primary alkyl halide structure, leading to fewer steric hindrances and reduced chances of elimination reactions.

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The student's error of heating the beaker directly with a flame causing the solution to boil and spatter could lead to an error in the determination of the ammonium ion in the unknown.

When the ammonium ion, NH₄⁺, is heated, it undergoes thermal decomposition to form ammonia gas, NH₃, and water vapor. This reaction is exothermic, meaning it releases heat.

Therefore, when the student heated the beaker directly with a flame, it led to the decomposition of the ammonium ion, causing the formation of ammonia gas and water vapor. The spattering of the solution could result in a loss of ammonium ions or an incomplete reaction of the ammonium ions.

As a result, the amount of ammonium ions detected would be less than the actual amount present in the solution. This would lead to an error in the determination of the concentration of the ammonium ion in the unknown. It is essential to follow proper testing procedures to avoid errors and obtain accurate results.

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Answer:

3.141592653589793238

Explanation:

3.141592653589793238

The molar mass of the unknown compound in the aqueous solution was 223.2 g/mol.

Osmotic pressure can be described as the minimum pressure requires to be applied to a solution to stop the flow of its pure solvent across a semipermeable membrane. The measurement of the tendency of a solution to take in a pure solvent by osmosis is osmotic pressure.

To determine the molar mass of a compound from the given weight, the concentration of the compound needs to be determined.

π = i ×MRT

8.44 = 1×M× 62.36 ×298

M = 4.54 × 10⁻⁴ M

Given the mass of the unknown compound = 15.2 mg = 0.0152 g

The volume of the compound = 150 ml =0.150 L

From the molarity of the compound, we can determine the molar mass as:

Molarity = mass/(Molar mass × Volume)

Molar mass =  mass/(Molarity × Volume)

Molar mass = 0.0152/ (4.54 × 10⁻⁴ × 0.150)

Molar mass = 223.2 g/mol

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Answer:

Water molecules have a weakly positive hydrogen end.

Explanation:

Water is a polar molecule. The pairs of electrons shared by the hydrogen atoms in a water molecule are actually more attracted to the oxygen atom with its eight protons than to the hydrogen atoms with their one each. The hydrogen end of the molecule is weakly positive and the oxygen end is weakly negative.

I hope it helps.

Answer:

47.6°C is the change of temperature

Explanation:

To solve this question we must use the equation of specific heat of a material:

Q = m*ΔT*S

Where Q is heat applied = 90J

m is the mass of the substance = 15g gold

ΔT is change in temperature = Our incognite

S is specific heat of the material = 0.126J/g°C for gold

Replacing:

90J = 15g*ΔT*0.126J/g°C

90J/15g*0.126J/g°C = ΔT

ΔT = 47.6°C is the change of temperature

The wavelength of the emitted photon is approximately 2.44 μm.

The wavelength of the emitted photon can be determined using the Rydberg formula as follow

\(\frac{1}{\lambda}=R_H\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)\)

where: lambda is the wavelength of the emitted photon,

\(R_H=1.0974\times10^7\text{m}^{-1} ,$n_1=19 n_2=5 :\frac{1}\)

\({\lambda}=R_H\left(\frac{1}{19^2}-\frac{1}{5^2}\right) \frac{1}\\\\\\{lambda}=1.0974\times10^7\text{m}^{-1}\left(\frac{1}{361}-\frac{1}{25}\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\left(0.002709-0.04\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\times(-0.037291) \frac{1}{\lambda}=-409446.34\text{m}^{-1} \lambda=-\frac{1}{409446.34\text{m}^{-1}}=2.44\times10^{-6}\text{m}\)

Therefore, the wavelength of the emitted photon is approximately 2.44 μm.

Rounded to two decimal places, this value is equal to 2.45 μm. Thus, the correct option is A) 2.45μm.

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The opposite of the words given include the following below:

a. boiling - cooling

b. melting - freezing.

This is referred to as a physical process which involves the conversion of a solid to a liquid such as from ice to liquid water.

The opposite of this is freezing which involves solidification and can be described as the conversion of a liquid to solid.

Boiling on the other hand involves the application of heat to a substance while the opposite will be reduction of heat which is referred to as cooling thereby making them the correct choices.

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Answer: The number of protons in the nucleus of the atom is equal to the atomic number . The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom is equal to the sum of the number of protons and neutrons in the nucleus.

The mass of an element is the sum of number of neutrons and protons in the atom. The number of electrons and protons in an atom is same and from the mass number number of neutrons can be calculated.

Mass number of an element is the sum of the number of protons and electrons in an atom. Electrons are negatively charged particles revolving around the nucleus and protons are positively charged particles. Neutrons are neutral and have no charge.

An atom in its neutral state contains equal number of electrons and protons. This number is called its atomic number. All the positive charges are neutralized with equal number of negative charges.

Now let's take an example of nitrogen, with atomic number 7. Nitrogen contains 7 electrons and 7 protons. Its mass number is 14. Thus number of neutrons is 14- 7  =7.

If we have mass number only and the atomic number is known  lets say 13 and 24 respectively. Then number of electrons is  12 and the same for protons and number neutrons is 24 - 13 =11.

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The significance of the Ronald Cotton case, that a person can be convicted without individual evidence. Therefore, option D is correct.

Evidence is something or information used to increase or decrease the likelihood that a fact exists. Evidence can be testimony, written materials, visual or audio recordings, DNA samples, or other physical artifacts.

In essence, evidence is utilized to support a claim made by people or organizations who think something is real or a fact. Evidence may also be used to debunk or dispute a fact or claim that others don't agree with or believe to be incorrect.

Thus, option D is correct.

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Answer:

So the total mass is 50 plus 150 grams the heat capacity 4.18 joules per gram per degree C. And the temperature change is 36 minus 25 and so we can calculate Delta H for the reaction that takes place.

Explanation:

The mass of iodine that must be added to prepare a 0.480 M solution if 62.9 mL of carbon tetrachloride is used is 7.614 g

The molarity of a solution is calculated, using the formula:

molarity = number of moles / volume of solution

The solution to the question is divided into steps:

Step 1: Determine the moles of iodine present in the solution:

Step 2: Calculate the mass of iodine

Therefore, the mass of iodine that must be added to prepare a 0.480 M solution if 62.9 mL of carbon tetrachloride is used is 7.614 g

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Answer:

cooling of surroundings

Explanation:

They are goggles, safety glasses, and face shields. Safety Glasses: Safety glasses have side shields and lenses composed of plastics like propionate or polycarbonate that are shatter-resistant.

They are designed to stop objects like wood chips and other heavy, dangerous objects from damaging your eyes. Protection from collision, dust, and chemical splashes is provided by goggles. Like safety glasses, safety goggles are very impact resistant. They also provide a secure barrier around the entire eye, protecting it from threats coming from all directions. Side protection is required. Direct ventilated goggles, commonly referred to as dust goggles, are a form-fitting style of eye protection designed to keep large particles out of the goggles. When handling hazardous substances, wear protective goggles or glasses at all times.

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Mass of Barium = 720.73 g ; Mass of Phosphorus = 108.37 g ; Mass of Oxygen =  223.91 g

To determine the masses of barium, phosphorus, and oxygen in a sample of barium phosphate (Ba3(PO4)2), you need to calculate the formula weight of the compound and then multiply it by number of moles of  compound in the sample.

First, calculate the formula weight of the compound:

Ba3(PO4)2 formula weight = (3 x 137.327 g/mol) + (2 x (30.97 g/mol + 4 x (16.00 g/mol)) = 601.9 g/mol

n = 1053.8 g / 601.9 g/mol = 1.75 mol

Mass of Barium = 3 x 137.327 g/mol x 1.75 mol = 720.73 g

Mass of Phosphorus = 2 x 30.97 g/mol x 1.75 mol = 108.37 g

Mass of Oxygen = 8 x 16.00 g/mol x 1.75 mol = 223.91 g

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Answer: false

Explanation:

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

The increase in pressure when a basketball is pumped up is caused by the change in the number of molecules (optionC).

When air is pumped into a basketball, the air molecules are forced into a smaller space, which increases the number of molecules in that space. This increase in the number of molecules leads to an increase in the pressure of the gas within the ball.To better understand why this is the case, we can use the ideal gas law, which describes the behavior of gases under various conditions. The ideal gas law is expressed as PV = nRT, where P is pressure, V is volume, n is the number of molecules, R is the gas constant, and T is temperature.
When air is pumped into a basketball, the volume of the ball remains the same (assuming the ball is rigid and does not expand), and the temperature of the air inside the ball does not change significantly. Therefore, according to the ideal gas law, the only way the pressure can increase is if the number of molecules (n) increases.
This increase in pressure is what makes the ball bouncy and allows it to be used for games and activities. It is important to note that overinflating a basketball can lead to a rupture or bursting of the ball due to the excessive pressure created by the increased number of molecules.

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The theoretical volume of methane gas produced by anaerobic decomposition of 10,000 metric tonnes of MSW placed in a landfill would be 500,000 m³.

To determine the volume of methane gas theoretically produced by anaerobic decomposition of 10,000 metric tonnes of municipal solid waste (MSW) placed in a landfill, we need to consider the following terms: methane, anaerobic respiration, composition, and landfill.

Step 1: Determine the composition of MSW that produces methane
Assuming a rough estimate of MSW composition, let's consider that 50% of the waste is organic material that can undergo anaerobic respiration, producing methane. In this case, 10,000 metric tonnes ×0.50 = 5,000 metric tonnes of organic material.

Step 2: Calculate methane produced by anaerobic respiration
Anaerobic respiration of organic material in landfills typically generates about 100 m³ of methane per metric tonne. Therefore, 5,000 metric tonnes of organic material would produce 5,000 × 100 m³ = 500,000 m3 of methane gas.

So, based on the given assumptions, the theoretical volume of methane gas produced by anaerobic decomposition of 10,000 metric tonnes of MSW placed in a landfill would be 500,000 m³.

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Answer:

b

Explanation:

Answer:

The answer is B

Explanation:

Answer:

Gavin magnus

Explanation:

I don't really care tho

Answer:

They do have a larger chance, but others might be infected too.

PLS GIVE BRAINLIEST

Answer:

thats false, yes they have a bigger chance but anyone can get it.

Explanation:

Answer:

Examples of physical changes are boiling, melting, freezing, and shredding.

__________________________________________________________

Because you do Not Have Options For this Question I Gave you some other examples!

Answer:

if you can tell us what to pick from we could help you, but i'll try.

Explanation:

A physical change is something that you can see, hear, smell, or feel changes. a chemical change is something that affects the actual thing inside.

Just try to pick the one that has a physical change to it. whether its smell, sound, sight, touch or taste.

~Chad :P