Which of the following best explains why you sanded the copper wire before burning it?
to create less friction between the copper and the tongsto make sure that copper metal was exposed on the surface of the wireto make the copper wire flammableto weaken the copper wire so it would be more reactive

The correct answer is D: 56.31 grams

Explanation: Got 90% on the quiz on edge and got this answer right

Answer:

The product of this reaction is the hydrochloric acid

Explanation:

The compounds required to perform a reaction are the reactants, in this case there are two: hydrogen and chlorine.

The resultant compound is denominated the product. In this case, the hydrochloric acid.

The reaction is:

[tex]Cl_2 + H_2 \longrightarrow 2 HCl[/tex]

Answer:

abbylittle is correct. When Metals and Nonmetals bond, they are held together by ionic bonds.

Explanation:

Answer:

The other guy is right. It's C

Explanation:

12.03 Quiz: Nonrenewable Energy - Fossil Fuels Part 2

XD

To calculate the molality of the aqueous solution of nitric acid, you first convert the mass of nitric acid to moles, then divide by the mass of water in kilograms. This gives a resulting molality of 5.86 mol/kg.

The molality of a solution is calculated through the number of moles of solute per kilogram of solvent. To calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid, we first need to determine the number of moles of Nitric acid and the mass of the water. Since the given information is in percantage by mass, we can assume a solution weight of 100g, therefore we have 27g of Nitric Acid and 73g(0.073 kg) of Water.

Step 1: Convert 27g of Nitric Acid to moles. Nitric Acid(HNO3) has a molar mass of about 63.01 g/mol, so that 27g/63.01 g/mol=0.428 mol of HNO3

Step 2: Calculate the molality using the formula molality=n(solute)/m(solvent in kg). So, our molality = 0.428 mol/0.073 kg = 5.86 mol/kg or simply 5.86m.

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To calculate the molality of a 27.0% nitric acid solution, determine the masses of solute and solvent, calculate the moles of [tex]HNO_3[/tex], convert the mass of the solvent to kilograms, and use the molality formula. The molality of this solution is 5.87 m.

Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.

To calculate the molality of a 27.0% [tex]HNO_3[/tex]aqueous solution:

Determine the mass of solute ([tex]HNO_3[/tex]) and solvent (water). For a 100 g solution:

Calculate the moles of [tex]HNO_3[/tex]. Molar mass of [tex]HNO_3[/tex]= 1.01 g/mol (H) + 14.01 g/mol (N) + 3 x 16.00 g/mol (O) = 63.01 g/mol

Moles of HNO3 = 27.0 g / 63.01 g/mol = 0.4285 mol

Convert the mass of water to kilograms. Mass of water = 73.0 g = 0.073 kg

Calculate the molality. Molality (m) = moles of solute / mass of solvent in kg

Molality = 0.4285 mol / 0.073 kg = 5.87 m

The molality of the 27.0% aqueous solution of nitric acid is 5.87 m.

The half-life of an element that decays by 3.415% each day is approximately 20.27 days.

The half-life of an element can be calculated using the formula:

half-life = (ln(2)) / (decay constant)

where the decay constant is the rate at which the element decays per time period. In this case, the element decays by 3.415% each day. To find the decay constant, we convert the percentage to a decimal by dividing it by 100:

decay constant = 0.03415

Now we can calculate the half-life:

half-life = (ln(2)) / (0.03415)

A calculator can be used to find the value of ln(2), which is approximately 0.693:

half-life = 0.693 / 0.03415 = 20.27 days

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Bohr's model of the atom places a limitation on electrons by assuming they move in discrete orbits, but this model is not accurate and does not account for electron-electron interactions.

Bohr's model of the atom places a limitation on electrons in that it assumes they move in discrete orbits around the nucleus, with each orbit having a certain energy level. However, this model does not account for electron-electron interactions in atoms with more than one electron and does not accurately represent the true behavior of electrons in atoms. As quantum mechanics was developed, it revealed that electrons do not have well-defined orbits but instead exist as clouds of probability around the nucleus. This limitation of Bohr's model was an important step toward developing a more accurate understanding of atomic physics.

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Taking into account the definition of molar mass, the mass of 0.433 moles of calcium nitrate is 71.012 grams.

Molar mass is the amount of mass that a mole of a substance contains, which can be an element or a compound.

Calcium nitrate is an inorganic compound with the formula Ca(NO₃)₂. The molar mass of a compound is the sum of the molar mass of the elements that make it up multiplied by the times they appear in the compound.

In this case, the molar mass of the elements is:

So, the molar mass of calcium nitrate is:

Ca(NO₃)₂= 40 g/mole + 2×(14 g/mole + 3×16 g/mole)

Ca(NO₃)₂= 164 g/mole

Then it is possible to apply the following rule of three: if by definition of molar mass 1 mole of calcium nitrate contains 164 g, 0.433 moles of the compound contains how much mass?

[tex]mass of calcium nitrate=\frac{0.433 molesx164 grams}{1 mole}[/tex]

mass of calcium nitrate= 71.012 grams

Finally, the mass of 0.433 moles of calcium nitrate is 71.012 grams.

Learn more:

Answer:   Determining the concentration of an unknown base

Explanation:   While performing a titration,below mentioned steps are followed in the written order -

a)  Finding out which pH indicator works - this is the important and the initial step

b)  After that , one will determine the molecular masses of the products formed in the reaction.

c)  After  determining the molecular mass, number of moles of the product are calculated in order to reach to the conclusion.

d) Thus the final step would be the determiation of the concentration of the unknown base.

Answer:

fungi is the right answer

Explanation: took the test

The gas that is having lowest density will diffuse faster than other gases. As lesser denser will diffuse more quickly than the one which is more denser. Density is directly proportional to mass of the substance that is more mass of the substance is , more denser it will be. So here the Gas A is having lesser molecular weight than the other gases so it will diffuse more quickly than the other gases.

Gas A; MW = 14.28 g/mol

Answer:

The compound may have properties that are very different from those of the elements.

Explanation:

For example - common salt, sodium chloride ( NaCl) has very different properties from sodium and chlorine

Plutonium-239 has 94 protons and 145 neutrons in its nucleus, represented by the symbol 239Pu.

Plutonium-239 has 94 protons and a mass number of 239. To find the number of neutrons, you subtract the number of protons from the mass number: 239 - 94 = 145 neutrons. The symbol for Plutonium-239 is 239Pu.

1. Protons (Z): The atomic number (Z) for plutonium (Pu) is 94. Hence, plutonium-239 has 94 protons.

2. Neutrons (N): The mass number (A) for plutonium-239 is 239. The number of neutrons (N) is calculated by subtracting the number of protons (Z) from the mass number (A), i.e., N = A - Z. Therefore, N = 239 - 94 = 145. Thus, plutonium-239 has 145 neutrons.

Answer: D

Explanation:

Answer:

It is 44.

Explanation:

I just did it on odyssey

The volume of the graduated cylinder to the correct degree of precision is 44 ml.

The volume of a liquid is typically measured in a laboratory with a graduated cylinder, commonly referred to as a measuring cylinder or mixing cylinder. It is narrowly cylindrical in form. The amount of liquid that has been measured is shown by each marked line on the graduated cylinder.

The volume of a liquid is frequently measured using graduated cylinders. Graduated cylinders are typically more exact and precise than laboratory flasks and beakers, but they shouldn't be used for volumetric analysis since they are less accurate and precise.

Instead, volumetric glassware, like a volumetric flask or volumetric pipette, should be used. The volume of a solid can occasionally be determined indirectly by measuring the displacement of a liquid using graduated cylinders.

Therefore, The volume of the graduated cylinder to the correct degree of precision is 44 ml.

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 the answer is combustion

The given equation represents a combustion reaction. The organic gas combines with atmospheric oxygen to form carbon dioxide and water .

Combustion is a type of reaction, in  which gaseous reactants combines with atmospheric oxygen to form carbon dioxide and water. In combustion reaction heat energy is released by the reaction system.

The reaction from which a heat energy is released is called an exothermic reaction. Thus, combustion is an exothermic reaction. The reaction in which heat is absorbed the system is called endothermic reaction.

In the given reaction, 2 moles of propanol reacts with 9 moles of oxygen forming 6 moles of carbon dioxide and 8 moles of water. This reaction is an example of combustion.

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Phospholipids form a bilayer when mixed with water, since the hydrophilic head is attracted to water, while the hydrophobic tails reject water and tend to aggregate with other hydrophobic molecules, this conflict is resolved with the formation of a lipid bilayer , which satisfies both parties.

They are those that have phosphoric acid in their composition, they are usually amphipathic: their molecules have a part that is soluble in water (that is, hydrophilic) and another that is not (hydrophobic).

Therefore, we can conclude that phospholipids are found in the active membranes of cells whose distinctive feature is they are usually amphipathic.

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Final answer:

Phospholipids form a bilayer in water due to their amphipathic properties, with hydrophilic heads facing the water and hydrophobic tails facing inward, creating a structure critical to cellular membranes.

Explanation:

Phospholipids spontaneously form a bilayer when mixed with water due to their amphipathic nature. Each phospholipid molecule has a hydrophilic (water-attracting) head and two hydrophobic (water-avoiding) tails.

In an aqueous solution, phospholipid molecules arrange themselves so that their hydrophilic heads are exposed to water, while their hydrophobic tails face each other inside the bilayer, away from the water.

This results in the formation of a lipid bilayer, a structure that is fundamental to the plasma membrane of cells. In this bilayer, the hydrophobic tails interact only with each other, forming a barrier that separates the water and other materials on one side from those on the other side.

Furthermore, when phospholipids are heated in aqueous solutions, they tend to form small spherical structures called liposomes or micelles, with the hydrophilic heads outside and the hydrophobic tails inside, underscoring their self-assembling properties.

The application of pressure makes ice to melt. This is because of the factor that externally applied pressure decreases or diminishes the melting point of ice, so it gets to transform into water readily. With the lowering of the melting point, it permits more solids to get transformed into water. Thus, leading to the melting of ice. This procedure is also known as regelation.

Explanation:

Molar heat combustion:

Molar heat of combustion is defined as heat released when 1 mole of substance is burnt under the action of oxygen gas to give water and carbon-dioxide.It is measured in kiloJoules (kJ) per mole.This heat of energy can be positive or negative.

The molar heat of combustion is illustrated as the heat discharged when one mole of the component is burnt by reacting with oxygen gas to provide carbon dioxide and water. It is determined in kJ per mole. This heat of energy can be negative or positive. In case if the enthalpy is negative than the reaction is considered as an exothermic reaction, and if the enthalpy is positive than the reaction is considered as an endothermic reaction.