The vapor pressure of 1,1-dichloroethane, CH3CHCl2, is 228 Torr at 25 8C; at the same temperature, that of 1,1-dichlorotetrafluoroethane, CF3CCl2F, is 79 Torr. What mass of 1,1-dichloroethane must be mixed with 100.0 g of 1,1-dichlorotetrafluoroethane to give a solution with vapor pressure 157 Torr at 25 8C

If the solution is still tinted blue after filtering out the copper, it suggests that some impurities or other compounds might still be present in the solution, which could affect the calculated molar mass of the unknown copper compound.

The molar mass of a compound is calculated by adding up the atomic masses of all the atoms in its formula. If impurities or other compounds are present in the solution, they may react with the reagents used in the analysis, leading to erroneous results.

For example, if the blue color is due to the presence of copper ions in the solution, the calculated molar mass of the unknown copper compound may be higher than its actual value. On the other hand, if the blue color is due to the presence of another compound, it may interfere with the determination of the amount of copper in the solution, leading to inaccurate results.

Therefore, it is important to ensure that the solution is free from any impurities or other compounds before performing any analysis to obtain reliable results. If the solution is still tinted blue, further purification steps may be required before proceeding with the analysis.

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A person walks 3.5 mph is speed. A bird flies 20 m/ s speed. A bird goes 30 m/s toward town is velocity.

Speed is define as the rate at which an object is moving along a path.speed is a scalar quantity.the average speed of object will continue same if the objects changes its direction. speed never be zero.

Velocity is define as the rate at which an object changes in certain direction.velocity is a vector quantity.velocity changes with time. velocity can be zero , negative or positive.

In the given case,

A person walks 3.5 mph .

this only ha magnitude, so, this is speed (s).

A bird flies 20 m/s .

this only has magnitude, so, this is speed.(s)

A bike goes 30 m/s toward town.

this has magnitude as well as direction.so, this is velocity (v)

Thus,A person walks 3.5 mph is speed. A bird flies 20 m/ s speed. A bird goes 30 m/s toward town is velocity.

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Answer:

136L

Explanation:

p1v1=p2v2

114 x44.0=37.0x V2

V2=136L

Answer:

Explanation:

Mass m1 = 44.8776

The molar solubility of AgCl in a solution that has [Cl−] = 2.0 × 10^−2M is 9.0 × 10^−9 M.

The solubility product constant, Ksp, for AgCl is given as 1.8 × 10^−10 at a certain temperature. The expression for Ksp is:

Ksp = [Ag+][Cl−]

where [Ag+] is the concentration of Ag+ ions in the solution, and [Cl−] is the concentration of Cl− ions in the solution.

For AgCl, the dissociation reaction is:

AgCl(s) ⇌ Ag+(aq) + Cl−(aq)

Let the molar solubility of AgCl be S. Then, at equilibrium, the concentrations of Ag+ and Cl− ions in the solution will be S and 2.0 × 10^−2 M, respectively.

So, the equilibrium expression for Ksp is:

Ksp = [Ag+][Cl−] = S × 2.0 × 10^−2

Substituting the given values, we get:

1.8 × 10^−10 = S × 2.0 × 10^−2

S = (1.8 × 10^−10) / (2.0 × 10^−2) = 9.0 × 10^−9 M

Therefore, the molar solubility of AgCl in a solution that has [Cl−] = 2.0 × 10^−2M is 9.0 × 10^−9 M.

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The atomic mass of rubidium listed in the periodic table to determine the mass of Rb−87 is 86.13 amu.

The atomic mass is the weight of the roton neutron and electron present inside the nucleus and shells of an atom and the elements are arranged on the basis of this only.

The mass of Rb−85 is 84.9118 amu for 1 amu it will be

amu =  84.9118 / 85 = 0.99

so, the amu for Rb−87 will be,

     AMU = 87 × 0.99 = 86.13 amu.

Therefore, the mass of Rb−87 is 86.13 amu for  atomic mass of rubidium listed in the periodic table.

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Approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.

The balanced equation provided is:

6CO2 + 6H2O -> C6H12O6 + 6O2

From the equation, we can see that for every 6 moles of water (H2O), 1 mole of glucose (C6H12O6) is produced. Therefore, we need to determine the amount of water required to produce 7.2 moles of glucose.

The mole ratio between water and glucose is 6:1. This means that for every 6 moles of water, we obtain 1 mole of glucose. To find the amount of water needed for 7.2 moles of glucose, we set up a proportion using the mole ratio:

(6 moles H2O / 1 mole glucose) = (x moles H2O / 7.2 moles glucose)

Solving for x, we can cross-multiply:

6 moles H2O * 7.2 moles glucose = x moles H2O * 1 mole glucose

43.2 moles H2O = x moles H2O

Therefore, we need 43.2 moles of water to produce 7.2 moles of glucose.

To convert moles of water to grams, we need to know the molar mass of water, which is approximately 18 g/mol. Using the molar mass, we can calculate the mass of water needed:

Mass of water = moles of water * molar mass of water

Mass of water = 43.2 moles * 18 g/mol

Mass of water = 777.6 g

Therefore, approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.

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Answer:

Gixt8x75zurx7txr7x7tzzr7zr7z64zz7z84

The volume of insulation material required is approximately 0.003606 cubic meters (m³).

To calculate the volume of insulation material, we can subtract the volume of the inner pipe (original pipe) from the volume of the outer pipe (original pipe + insulation).

Given:

Length of the pipe, L = 10 m

Radius of the pipe, r = 7 cm = 0.07 m

Thickness of the insulation, dr = 2 mm = 0.002 m

The outer radius of the larger pipe is R = r + dr.

Using the formula for the volume of a cylinder, V = π(R² - r²)L, we can substitute the values and calculate:

V = π((0.07 + 0.002)² - 0.07²) × 10

V ≈ 3.606 × 10⁻³ m³

Therefore, the volume of insulation material required is approximately 0.003606 m³ (cubic meters).

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Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

IF HELPED MARK AS BRAINLIEST

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

Answer:

gasoline

Explanation:

Answer:

Explanation:

1) Calcium = ?

→ Ca will constitute to form ionic bond.

2) Rubidium iodide = ?

→ Rubidium iodide will form ionic bond.

3) Nickel (IV) selenide = ?

→ Nickel (IV) selenide forms ionic bond.

Spanish System is not the name of a measurement system

WHAT IS MEASUREMENT SYSTEM?

Hence, Spanish System is not one of the names of measurement of systems.

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La fuerza de la gravedad depende de la masa (el peso) de cada objeto. La fuerza con que se atraen dos objetos es proporcional a su masa y disminuye rápidamente en el momento en que los separamos. De hecho, nosotros también atraemos objetos con ‘nuestra’ fuerza gravitatoria, pero pesamos tan poco que no podemos percibirlo. En cambio, el Sol es tan grande que es capaz de mantenernos girando a su alrededor a pesar de estar muy lejos. La Luna también ejerce su propia fuerza gravitatoria, pero, como es más pequeña y ligera que la Tierra, si nos pesásemos sobre su superficie veríamos que pesamos unas seis veces menos que en la Tierra.

Podríamos preguntarnos por qué la Luna no cae sobre la Tierra al igual que una manzana cae del árbol. La razón es que nuestro satélite nunca está quieto. Se mueve constantemente a nuestro alrededor. Sin la fuerza de atracción terrestre, se alejaría flotando en el espacio. Gracias a esta combinación de velocidad y distancia de nuestro planeta, la Luna siempre está en equilibrio, ni cae ni se aleja. Si se moviera más rápido, se alejaría, si se moviera con más lentitud, ¡caería!

Hemos dicho que la fuerza de la gravedad también depende de la distancia. Si nos alejásemos lo suficiente de la Tierra, escaparíamos a su fuerza de atracción. Y eso es lo que tratamos de hacer con las naves espaciales. Necesitamos superar la llamada ‘velocidad de escape’, que es aproximadamente 11,2 km/s (a esa velocidad, podríamos viajar de Londres a Nueva York ¡en tan solo 10 minutos!). Cuando un cohete alcanza esa velocidad, ya es libre para viajar por el sistema solar.

Dentro de una nave en órbita, no sentimos la fuerza de la gravedad terrestre. Los objetos no caen, sino que flotan, así que si saltas, no regresas al suelo. Es lo que les ocurre a los astronautas cuando están a bordo de una estación espacial que orbita alrededor de la Tierra.

Answer:

866000

Explanation:

because one kilometer (km) = 1000000 millimeters (mm)

In the distillation of a pure material, all of the pure material not vaporize once the boiling point is reached because more heat would need to be added to the distillate in order to vaporize the liquid from its boiling point.

During distillation, the process of vaporizing a liquid and collecting the resulting vapor as a purified substance, it is important to consider the energy requirements involved.

When a liquid reaches its boiling point, it undergoes a phase change from the liquid phase to the gas phase. This phase change requires the input of energy in the form of heat. The heat breaks the intermolecular forces holding the liquid molecules together, allowing them to transition into the gas phase.

The heat required to vaporize a liquid is not solely determined by the boiling point. The heat required to convert a liquid into a gas is known as the heat of vaporization, and it varies depending on the substance.

When distilling a liquid, such as water, the heat of vaporization must be supplied to convert the liquid into vapor. This energy is absorbed by the liquid, and it is essential to provide continuous heating to maintain the distillation process.

As the liquid is heated and reaches its boiling point, vaporization begins. However, the rate at which the liquid vaporizes depends on the amount of heat being supplied. If the heat input is insufficient, the vaporization process will be slower, and not all of the liquid will vaporize at once.

To ensure the complete vaporization of a liquid during distillation, a sufficient amount of heat must be continuously applied to the system. This allows the heat of vaporization to be continually supplied to the liquid, facilitating the conversion of the entire liquid into vapor.

If the heat input is insufficient, the vaporization process will be slower, and the liquid may not vaporize all at once. Providing adequate and continuous heating is crucial to ensure the complete conversion of the liquid into vapor during distillation.

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Answer:

Both A and B are molecules.

Answer:

Gain energy as a liquid changes to a gas

Explanation:

get further apart= more kinetic energy

liquid at beginning as not uniform but quite close together and takes shape of container

The answer is...Liquid into gas.

My Explanation:

Stated in the model, The atoms aren't that active but can still slider past each other; meaning, this is a liquid. As it shifts into a gas, which is when atoms pick up energy and move around more freely/actively, the definition of the following is "Vaporization".

So the answer is: B, or in other words, "Atoms gain energy as a liquid turns into a gas.

1 L of the acid solution contains 142.85 mg of CaCO3.

Given, mass of H2SO4 = 140 mg / L

The molecular weight of H2SO4 = 98g / mol

Molarity = mass of H2SO4 / molecular weight of H2SO4 = 140/98 = 1.4285

Normality = Molarity x n factor n factor for H2SO4 = 2Molarity = 1.4285

Normality = 2 x 1.4285 = 2.857 mg / mL1 mol of H2SO4 = 98 g

Hence, 1 ml of H2SO4 = 98/1000 = 0.098gCaCO3 has a molecular weight of 100 g. Therefore, 1 mole of CaCO3 has a mass of 100 g. According to this, 1 mole of CaCO3 reacts with 2 moles of H2SO4.

The normality of the acid is 2.857.

Hence, 1 L of the acid will have 2.857 moles of H2SO4.To calculate the concentration in mg/L of the acid in terms of CaCO3, we need to first find the number of moles of CaCO3 that can be reacted with 2.857 moles of H2SO4.2 moles of H2SO4 react with 1 mole of CaCO3.Therefore, 2.857 moles of H2SO4 will react with:

1 mole of CaCO3/2 moles of H2SO4 = 1.4285 moles of CaCO3In 1 L of the acid, there are 1.4285 moles of CaCO3.The mass of 1.4285 moles of CaCO3 = 1.4285 x 100 = 142.85 g / L

Therefore, 1 L of the acid solution contains 142.85 mg of CaCO3.

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In order for a reaction to occur, the molecules of both the reacting molecules needs to collide.

A chemical reaction occurs when one or two substances combine to form new substances called products. There are different types of chemical reactions which include:

For a chemical reaction to occur the following must take place:

Therefore, in order for a reaction to occur, the molecules of both the reactants and products needs to collide.

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Answer:

25 size or length.

Answer:

25) Length

26) P-wave

27) P-wave

28) Surface wave

29) Body wave

30) epicenter

And so many more

Its is different because Iron-59 contains 33 neutrons. We also call it the same because it has 26 protons.

Due to its 33 neutrons, iron-59 differs from other iron isotopes. Due to the fact that all isotopes have 26 protons, they are all the same.

What are Isotopes?
Isotopes two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Hence, Iron-59 is different form other isotopes of iron because it contains 33 neutrons. It is the same as other isotopes because they all contain 26 protons.

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Answer:

How many grandmother oxalic acid are required to prepare this, we have to need for the mass

Explanation:

The four polymers that can be used to give the same effect as xanthan gum are guar gum, locust bean gum, carrageenan, and carboxy methyl cellulose. Among these, guar gum could give high viscosity and lower flocculation.

Polymers are the macromolecules made up of monomers bonded together. These polymers are widely used in various applications due to their diverse properties such as high viscosity, high tensile strength, flexibility, transparency, and many more. Xanthan gum is one of the commonly used polymers that are used as a thickener, emulsifier, and stabilizer in various industries such as food, pharmaceuticals, cosmetics, and many more. Xanthan gum is derived from the bacterial fermentation process, but it is relatively expensive.

Carboxymethylcellulose: Carboxymethylcellulose is a synthetic polymer made by reacting cellulose with chloroacetic acid. It is used as a thickener and stabilizer in various food and cosmetic applications. It has high viscosity and excellent water-binding capacity, making it an ideal alternative to xanthan gum.Out of these four polymers, guar gum could give high viscosity and lower flocculation.

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The heat that has been taken in by the water is 40.2 kJ.

We know that when we heat the water the water would be turned from liquid to the vapor state . As such we are interested in the heat that would be evolved when this process would be taking place and we can be ale to write that;

H = mcdT

H = heat that have been evolved or absorbed

m = mass of the water

c = Heat capacity of the water

dT = The temperature change of the water.

As such, we have that;

H = 500 * 4.12 * (39.5 - 20)

H = 40.2 kJ

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Answer:

Explanation:

The correct answer is B. isotopes.

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This difference in the number of neutrons leads to variations in their atomic mass but does not affect their chemical properties or reactivity. Isotopes of an element have similar chemical behaviors but may have slightly different physical properties due to the difference in atomic mass.

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The formula for ionic compound always indicate empirical formula. Empirical formula is the lowest number of the condition of the element present in a compound..

Empirical formula is formula represent the minimum condition of the reaction to happen between element. Empirical formula is commonly use to calculate the important value of a compound such as:

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The  stationary metal sphere can have kinetic energy by: The metal's molecules are moving around.

When you find a substance's temperature, you are measuring the "average kinetic energy of the particles in the substance." Temperature is a measure of the average kinetic energy of the particles (atoms or molecules) that make up a substance.

Kinetic energy is the energy an object possesses due to its motion. It is defined as the energy that a body possesses by virtue of being in motion. The amount of kinetic energy that an object has depends on its mass and its velocity. Mathematically, the kinetic energy of an object can be expressed as KE = (1/2)mv^2, where KE is the kinetic energy, m is the mass of the object, and v is its velocity.

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which best explains why estuaries are an important habit for many Marine organisms in comparison to the open ocean?

there are more nutrients available in estuaries

Dispersion forces are a type of intermolecular force that exists between only polar molecules . dispersion forces are the strongest type of intermolecular force. however, dispersion forces are stronger for larger molecules because they are more polarizable .

What is dispersion forces?

The least powerful intermolecular force is the London dispersion force. When the electrons in two nearby atoms occupy positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive force. The term "induced dipole-induced dipole attraction" is frequently used to describe this effect. When the temperature is sufficiently dropped, London forces—attractive forces—cause nonpolar substances to condense into liquids and to freeze into solids.

When an atom or molecule's electrons are dispersed asymmetrically around the nucleus, an instantaneous (temporary) dipole can form due to the electrons' continual mobility.

Whether they are polar or nonpolar, all molecules exhibit dispersion forces.

Atoms and molecules that are bigger and heavier show larger dispersion forces than those that are smaller and lighter.

The valence electrons are, on average, farther from the nucleus in a larger atom or molecule than in a smaller atom or molecule. They can more easily create transient dipoles because they are not held as tightly.

The term "polarizability" refers to how easily the electron distribution around an atom or molecule can be altered.

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