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What is the melting point of benzoic acid that you deteined? How does this compare to the literature value? What does this tell you about the purity of the compound?
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In order to have a charge, an atom or molecule must have more electrons than protons, which is what creates an ion.

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If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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Answer:

In an investigation to determine if the time taken for magnesium to react completely with hydrochloric acid is affected by the concentration of the acid used, the students would have controlled the following variables:

Concentration of Hydrochloric Acid: The concentration of the hydrochloric acid used in each trial would have been controlled. The students would have prepared hydrochloric acid solutions of different concentrations, and ensured that the concentration of the acid was the only variable that changed between the trials.

Mass of Magnesium: The mass of the magnesium used in each trial would have been controlled. The students would have used the same length of magnesium ribbon for each trial, ensuring that the mass of magnesium was the same in each experiment.

Volume of Hydrochloric Acid: The volume of hydrochloric acid used in each trial would have been controlled. The students would have used the same volume of hydrochloric acid for each trial, ensuring that the amount of acid was constant across all experiments.

To ensure consistency and accuracy, the students would have used precise measuring tools to measure the volumes of hydrochloric acid used and the length of the magnesium ribbon. They would have also ensured that the temperature of the acid and the timing method were kept constant throughout the experiment. By controlling these variables, the students would have been able to accurately determine the effect of the concentration of hydrochloric acid on the time taken for magnesium to react completely.

When two magnets are repelling each other, the following are true:

A magnet is a substance or item that generates a magnetic field. This magnetic field is invisible, but it is responsible for a magnet's most remarkable property: a force that attracts or repels other ferromagnetic elements such as iron, steel, nickel, cobalt, and so on.

Magnets are classified into three types: perpetual magnets, temporary magnets, and electromagnets. Permanent magnets produce a magnetic field without requiring any external magnetism or electrical power.

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Answer:

well if you're asking for the other word for evaporation then it would have to be condensation.

Explanation:

Condensation definition, water which collects as droplets on a cold surface when humid air is in contact with it.

The ground-state electron configuration of the given atom is [Kr]\(4d^{10}5s^{2}5p^{1}\), and the element to which this atom belongs is Indium (In).

The ground-state electron configuration of a particular atom is [Kr]\(4d^{10}5s^{2}5p^{1}\).
We know that Kr (Krypton) has 36 electrons. Additionally, there are 10 electrons in the 4d orbital, 2 electrons in the 5s orbital, and 1 electron in the 5p orbital.
Total number of electrons = 36 (from Kr) + 10 (from 4d) + 2 (from 5s) + 1 (from 5p) = 49 electrons.
An element with 49 electrons has an atomic number of 49.

According to the periodic table, the element with an atomic number of 49 is Indium (In).
The ground-state electron configuration of the given atom is [Kr]4d10 5s2 5p1, and the element to which this atom belongs is Indium (In).

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Answer:

donald trump

Explanation:

Answer:

Explanation:

The mass of the volleyball can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{7}{10} = 0.7 \\ \)

We have the final answer as

Hope this helps you

Two ways that can be used to identify which layer is organic and which layer is the aqueous layer in a liquid-liquid extraction are:

There are many methods that can be used to distinguish two layers from each other using contrast between the two substances in certain properties. One of the common methods that can be used to distinguish aqueous layer from an organic layer is adding water to mixture and observing which layer increases in size. The layer that increases in the size is the aqueous layer, as water is immiscible with organic layer. Thus, water can only increase aqueous layer. Another way is, for a start, the ethereal layer, even laden with organic solute, should be less dense than aqueous layer, and thus should be floating on top. Sometimes you can even tell by rubbing solvent with your fingers.

Extraction is a process used in organic chemistry for isolating a certain substance or a compound from its source material. Since the source material is composed of the various molecules and compounds but only a specific compound is needed, the desired compound has to be separated from the mixture.

A liquid-liquid extraction method is a method used to extract substance using the two immiscible of different natures. Since two liquids are immiscible, they liquids form the two layers when added to the same vessel. This is typically done using the water and an organic solvent that is insoluble in water. When two are mixed, they form an aqueous layer and an organic layer.

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Answer:

Argon is a noble gas

Hope this helps

According to standard temperature and pressure conditions,22.4 liters of volume of SO₂ is produced.

Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.

Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.

These values are important to physicists, chemists ,engineers ,pilots and navigators.

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Answer:

because it will control the birth of a child which can happen alot being overpopulated in the country or world. It also can mange their life and create a small and happy and healthy family.Also the child can get more love and support from their parents if they have less children and it wont be a taruma for the couple as well.  because growing a child can be expensive time costly and really hard.

Explanation:

plz mark me as a brainlest a and thanks my answer

Condensation is the phase change from gas to a liquid, whereas evaporation is the phase change from liquid to gas.

Answer:

ΔG°rxn = 28.4kJ/mol at 600K

Explanation:

Using Hess's law, you can find the ΔH°rxn and S°  subtracting ΔH°f of products - ΔH°f of reactants ×its coefficients. In the same way for S°rxn

For example, for the reaction:

aA + bB → cC:

ΔH°rxn = c×ΔH°fC - (a×ΔH°fA + b×ΔH°fB).

S°rxn = c×S°fC - (a×S°fA + b×S°fB).

For the reaction:

SO₂(g) + Cl₂(g) → SO₂Cl₂(g)

ΔH°rxn = 1×ΔH°f{SO₂Cl₂} - (1×ΔH°fSO₂ + 1×ΔH°fCl₂).

S°rxn = 1×S°f{SO₂Cl₂} - (1×S°fSO₂ + 1×S°fCl₂).

As at 298K:

ΔH°f{SO₂Cl₂} = -364.0kJ/mol

ΔH°f{SO₂} = -296.8kJ/mol

ΔH°f{Cl₂} = 0kJ/mol

ΔH°rxn = 1×{-364.4kJ/mol} - (1×-296.8kJ/mol + 1×0).

ΔH°rxn = -67.2kJ/mol at 298K.

S°f{SO₂Cl₂} = 311.9J/molK

S°f{SO₂} = 248.2J/molK

S°f{Cl₂} = 223.0J/molK

S°rxn = 1×{311.9J/molK} - (1×248.2J/molK + 1×223.0J/molK).

S°rxn = -159.3J/molK = -0.159.3KJ/molK

Using:

ΔG°rxn = ΔH°rxn - S°rxn×T

Assuming ΔH°rxn doesn't change at 600K:

ΔG°rxn = -67.2kJ/mol - -0.159.3J/molK×600K

The pressure of the NH3 gas is 2.19 atm, a sample of 4.30 moles of NH3 gas occupies 6.50 L at 45°C.

Gas pressure is the force per unit area exerted by a gas on the walls of its container. It is a measure of the number of gas molecules colliding with the container's walls per unit of time, and is proportional to the number of gas molecules and their kinetic energy. It is a result of the gas molecules moving randomly in all directions and colliding with the walls of the container. When a gas is confined in a container, its pressure is exerted equally in all directions. The pressure is a scalar quantity, which means it has only magnitude and does not have a direction.

Gas pressure can be measured in a variety of units, including atmospheres (atm), torr, pascals (Pa), and pounds per square inch (psi). The most commonly used units for measuring gas pressure are atmospheres and pascals.

To calculate the pressure of a gas, the Ideal Gas Law is used which states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First step:  Convert the temperature from Celsius to Kelvin:

45°C + 273.15 = 318.15 \(K\)

Second step:Plug in the values and solve for P:

\(P = (nRT) / V\)

\(P = (4.30 moles * 0.0821 Latm/molK * 318.15 K) / 6.50 L\)

\(P = 2.19 atm\)

So, the pressure of the \(NH3\) gas is 2.19 \(atm\).

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The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1g of the substance by 1K.

Calculating the change in temperature:

By substituting what we are given into the equation to solve for the unknow x we have;

Answer: Energy needed is 449.35J

Answer:

23

This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.

Answer:

23 neutrons

Explanation:

Answer:Its D

Explanation:

Trust

Answer:

food source

Explanation:

Got 100%

When, solution will be prepared by dissolving a 8.29 g of Na₂SO₄  in enough water to make a 225 ml of solution. Then, the molarity of the solution is approximately 0.259 M.

To calculate the molarity of the solution, we need to determine the number of moles of sodium sulfate (Na₂SO₄ ) and then divide it by the volume of the solution in liters.

Given; Mass of Na₂SO₄  = 8.29 g

Volume of solution =225 ml = 0.225 L

Calculate the number of moles of Na₂SO₄;

The molar mass of Na₂SO₄  can be calculated by summing the atomic masses of its constituents;

Na; 22.99 g/mol (atomic mass of sodium)

S; 32.07 g/mol (atomic mass of sulfur)

O; 16.00 g/mol (atomic mass of oxygen, there are 4 oxygen atoms in Na₂SO₄ )

Molar mass of Na₂SO₄ = (2 × Na) + S + (4 × O)

= (2 × 22.99) + 32.07 + (4 × 16.00) = 142.04 g/mol

Now, we will calculate the number of moles of Na₂SO₄ ;

moles = mass / molar mass

moles = 8.29 g / 142.04 g/mol = 0.0584 mol

Calculate the molarity of the solution;

Molarity = moles / volume

Molarity = 0.0584 mol / 0.225 L ≈ 0.259 M

Therefore, the molarity of the solution will be 0.259 M.

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Answer:  Sufficient volume of air is present in lump of cotton wool. then dipped in water, this air goes out due to which the cotton lump shrunk.

yes

The electric potential at the point indicated by the dot is 0 volt.

The left side had indicated as positive side +Q whose length is 1/2 and the right side is negative whose length is 1/2.

Potential energy (V) is given as:

V = 1/4π∈ (-dq/\(\sqrt{(d^{2}) + (x^{2} ) }\) due to negative charge at point P.

Divide both sides with dq, we get

V =  1/4π∈ (-dq/\(\sqrt{(d^{2}) + (x^{2} ) }\) due to positive charge at point P.

Total summation of both charge is:

V = \(V_{+} + V_{-}\) = [ 1/4π∈ (-dq/\(\sqrt{(d^{2}) + (x^{2} ) }\)] + 1/4π∈ (-dq/\(\sqrt{(d^{2}) + (x^{2} ) }\) = 0

The difference in potential energy per unit charge between two points in an electric field is known as the electric potential, often known as voltage. The amount of effort required to transport a unit positive charge from an infinitely faraway location to a certain place is known as the electric potential at that location. Electric potential is measured in volts (V), which is also known as joules per coulomb in the SI.

It stands for electrical potential energy and describes the change in potential that a unit charge would experience if it travelled a distance. The gravitational potential energy of a kilogram measured between two altitudes can be used as a comparison.

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The complete question is:

The two halves of the rod in FIGURE EX25.35 are uniformly charged to {Q. What is the electric potential at the point indicated by the dot?

Answer:

The true statement is: "There is more energy in steam at 100°C than water at 100ºC."

This is because steam at 100°C has more thermal energy than water at 100ºC because it has undergone a phase change from liquid to gas, which requires additional energy.

The other statements are not true:

   To condense steam, the temperature must increase, not decrease. Condensation is the process by which a gas (steam) changes phase to a liquid, and this requires the removal of energy, usually through cooling.

   To melt ice, the temperature must increase. Melting is the process by which a solid (ice) changes phase to a liquid, and this requires the addition of energy, usually through heating.

   Iron can exist in all three states of matter (solid, liquid, and gas) depending on the temperature and pressure. However, at room temperature and standard atmospheric pressure, iron is a solid.

Explanation:

Answer:

The moving train

Explanation:

Kinetic energy is energy being used right now. So, the only object using energy right now is the moving train

Good luck on the rest of the test!

Answer:

A link is a fastening unit that attaches two parts of an object together

Different types of links have different characteristics

Answer:

Linking is the process of combining all the component object files. The linker determines where the code will reside in memory and how control will transfer between the components.

The higher the concentration of OH- ions, the more basic the solution becomes.Finally, a solution is considered to be neutral if the concentration of H+ ions and OH- ions are equal. In this case, the pH value of the solution is 7.

The concentration of hydrogen ions (H+) and hydroxide ions (OH-) determine whether a solution is acidic, basic or neutral. The pH scale ranges from 0 to 14. If the pH value of a solution is less than 7, it is acidic. If the pH value is greater than 7, it is basic. If the pH value is equal to 7, it is neutral.A solution is considered to be acidic if it has a higher concentration of H+ ions and a lower concentration of OH- ions. In an acidic solution, the concentration of H+ ions is greater than the concentration of OH- ions. The higher the concentration of H+ ions, the more acidic the solution becomes.On the other hand, a solution is considered to be basic if it has a lower concentration of H+ ions and a higher concentration of OH- ions. In a basic solution, the concentration of OH- ions is greater than the concentration of H+ ions. The higher the concentration of OH- ions, the more basic the solution becomes.Finally, a solution is considered to be neutral if the concentration of H+ ions and OH- ions are equal. In this case, the pH value of the solution is 7.
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The equation for the molar enthalpy change as a function of temperature is given by:

H = C-p * (T,f - Ti)

Where C-p is the heat capacity of the substance, T,f is the final temperature, and Ti is the initial temperature.

The heat capacity of a substance is a measure of the amount of energy (heat) required to raise the temperature of a given mass of the substance by one degree Celsius. It is often expressed in the unit of J/mol⋅K.

The molar enthalpy change can be used to determine the energy released or absorbed during a chemical reaction. For exothermic reactions, the molar enthalpy change is negative, indicating that energy has been released during the reaction. For endothermic reactions, the molar enthalpy change is positive, indicating that energy has been absorbed during the reaction.

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