What type of reaction is melting?

Answer:

Movement of tiny particles called atoms, molecules and ions in a solids,liquid and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.

Answer:

Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron

Explanation:

Answer:

As trees grow, they help stop climate change by removing carbon dioxide from the air, storing carbon in the trees and soil, and releasing oxygen into the atmosphere. Trees provide many benefits to us, every day.

The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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The statement "for a given substance the entropy always increases in the following order: s (gas) < s (liq) < s (solid)" is generally true but there are exceptions.

Entropy is a measure of the degree of randomness or disorder in a system. In general, the more disorderly a system is, the higher its entropy. Therefore, for a given substance, its entropy will tend to increase as it goes from a solid to a liquid to a gas because the particles become more disordered and can move more freely.
However, there are some exceptions to this trend. For example, water is a substance that has a higher entropy in its solid form (ice) than in its liquid form. This is because the crystal structure of ice allows for more disorderly arrangements of water molecules than in liquid water. Another exception can occur when a substance undergoes a phase transition, such as melting or boiling. During these transitions, the entropy of the substance may temporarily decrease even though it eventually increases as the substance becomes more disordered in its new phase.
In summary, while the statement is generally true, there are exceptions to the trend of increasing entropy from solid to liquid to gas, and it is important to consider the specific properties of each substance when discussing its entropy.

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The positive energy protons and negative electrons balance out.

A force that resists motion when objects touch is friction. Frictional force is the force that prevents an object from moving.

The term friction is defined as the force that opposes the motion of a solid object over another. There are four types of friction that are static friction, sliding friction, rolling friction, and fluid friction.

Three factors in particular determine the frictional force between two bodies: The adhesion between body surfaces, the surface roughness, and the deformation of bodies are all factors.

Frictional force is the force that prevents an object from moving. The imperfections on the two surfaces in contact are what produce friction. The type of surfaces in contact affects friction.

Thus, A force that resists motion when objects touch is friction.

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Answer:

Protons = 89

Neutrons = 142

Electrons = 89

Option C

Explanation:

Hello,

Were required to find the proton, neutron and electron of an element Y

The atomic mass of element Y is composed of the protons and neutrons while the atomic number is the exact amount of protons present in the element.

Element = ₈₉²³¹Y

Atomic number = 89

Number of protons = 89

Number of electrons = 89

Atomic mass = 231

Atomic mass = protons + neutrons

231 = 89 + neutrons

Neutrons = 231 - 89

Neutrons = 142

Therefore the number of protons is 89, number of neutrons is 142 and number of electrons is 89.

Note: for an electrically neutral atom, the number of protons must be equal to the number of electrons

We can see here that the table will be:

Jar      Acid Concentration       Final Mass (grams)

1                   0%                                      100

2                  5%                                      95

3                  10%                                      90

4                  15%                                       85

A rock is a naturally occurring solid substance composed of minerals. It is a fundamental component of the Earth's crust and can be found in various shapes, sizes, and compositions.

As you can see, the mass of the rocks decreases as the concentration of acid increases. This is because the acid reacts with the rocks, dissolving some of the material. The more concentrated the acid, the more material is dissolved.

This experiment demonstrates the process of chemical weathering.

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Answer:90°

Explanation:

The two triangles are located on the points as shown in the image. To place the tringle ABC on the top of the triangle DEF , we have to move ABC one 45° rotation.

The three sides of a tringle can be represented using the coordinate axes and the sides as well the diagonals are easily indicated using the coordinate values. The rotation of triangles can be represented using coordinate axes to identify the correct angle of rotation.

Here, one complete rotational cycle through the 4 axes is 360°  rotation. One half that from the positive side to the negative axis is 180° . Then, from x to y it is 90° .

The triangle ABC can be placed on the top of triangle DEF by rotating 45° . Since 90°  rotation will make the triangle ABC to cut the x- axis line we need to make half rotation only.

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A 1,3-cis disubstituted cyclohexane is more stable than its trans isomer due to its lower steric strain.

In a cis isomer, the two substituents are on the same side of the ring. In a trans isomer, the two substituents are on opposite sides of the ring. In the cis isomer, the two substituents are closer together and therefore have a higher steric strain. This strain is caused by the repulsion between the electron clouds of the two substituents.

In a trans isomer, the two substituents are further apart and therefore have a lower steric strain. This lower strain makes the trans isomer more stable than the cis isomer.

However, in a 1,3-cis disubstituted cyclohexane, the two substituents are in the equatorial positions of the ring, which reduces the steric strain. In the trans isomer, one substituent is in the axial position and the other is in the equatorial position, which creates a higher steric strain.

Therefore, the 1,3-cis disubstituted cyclohexane is more stable than its trans isomer due to its lower steric strain.

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Answer:

One

Explanation:

A unicellular organism consists of one cell.

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The mass percent of a vinegar solution with a total mass of 96.37 g that contains 3.85 g of acetic acid is 3.99%

The solution composition is often described in mass percentage. It shows the mass of solute present during a given mass of solution. The number of solutes is expressed in mass or by moles.

Mass percentage = ( mass of the component / total mass ) × 100

The Mass per cent formula is expressed as solving for the molar mass also for the mass of each element in 1 mole of the compound.

Given,

Total mass = 96.37g

Mass of acetic acid = 3.85g

Mass percentage = ( mass of acetic acid / total mass ) × 100

= ( 3.85 / 96.37) × 100

= 3.99 %

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Answer:

2

Explanation:

Answer:

2

Explanation:

The minimum amount of energy that must be removed to produce solid ethyl alcohol is approximately 21.837 kJ.

To determine the minimum amount of energy that must be removed to produce solid ethyl alcohol, we need to find the heat of fusion for ethyl alcohol and use it to calculate the energy change during the phase transition from liquid to solid.

The heat of fusion (Δ\(H_{fus\)) is the amount of heat energy required to convert a substance from its solid state to its liquid state at its melting point. For ethyl alcohol, the heat of fusion is approximately 5.02 kJ/mol.

First, we need to calculate the number of moles of ethyl alcohol in the beaker. To do this, we'll use the density of ethyl alcohol, which is approximately 0.789 g/mL.

Given:

Volume of ethyl alcohol = 254 mL

Density of ethyl alcohol = 0.789 g/mL

We can calculate the mass of ethyl alcohol using the formula:

Mass = Volume × Density

Mass = 254 mL × 0.789 g/mL = 200.506 g

Next, we need to convert the mass of ethyl alcohol to moles using its molar mass. The molar mass of ethyl alcohol (\(C_2H_5OH\)) is approximately 46.07 g/mol.

Moles = Mass / Molar mass

Moles = 200.506 g / 46.07 g/mol = 4.35 mol (approximately)

Now, we can calculate the minimum amount of energy required to produce solid ethyl alcohol by multiplying the moles of ethyl alcohol by the heat of fusion.

Energy = Moles × ΔHfus

Energy = 4.35 mol × 5.02 kJ/mol = 21.837 kJ (approximately)

Therefore, the minimum amount of energy that must be removed to produce solid ethyl alcohol is approximately 21.837 kJ.

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At the transition stage, one form of matter starts getting converted into another form of matter.

Solid, liquid and gas are the three phases in which matter occur in nature. Matter is interconvertible in nature i.e it can be converted from one form to another.

Melting, freezing and evaporation are the three phases of transition.

Liquid water at low temperature freezes to form solid ice. This process is known as freezing. Whereas, liquid water when provided high temperature or heat releases vapours. This process is known as evaporation. Solid ice when brought at room temperature gets converted back into liquid water. This process is known as melting.

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Answer:Solution A has 10 times more hydrogen ions than solution B.

Answer:

It the letter K

Explanation:

Net pay is the amount paid to employees after deductions like income tax and FICA withholdings.

We need to break down the different components of the payroll costs. Net pay is the amount paid to employees after deductions like income tax and FICA withholdings. In this case, the net pay distributed was $136,500. Income tax withholdings, which are based on the employee's income and tax bracket, were $20,200. FICA withholdings, which include Social Security and Medicare taxes, were $9,025.
To calculate the total payroll costs for this pay period, we need to add the net pay, income tax withholdings, and FICA withholdings. This gives us a total of $165,725. This is the amount that the company paid out to employees for this pay period. However, it's important to note that this total excludes any unemployment taxes.
In summary, the total payroll costs for this pay period, excluding any unemployment taxes, was $165,725. This includes the net pay, income tax withholdings, and FICA withholdings.

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Answer:

In general, electrons can be shared between atoms (a molecular bond) or electrons can be completely removed from one atom and given to another (an ionic bond). ... Water is a molecule because it contains molecular bonds. Water is also a compound because it is made from more than one kind of element (oxygen and hydrogen).

Explanation:

The enthalpy of reaction once you have m, the mass of your reactants, s, the specific heat of your product, and T, the temperature change from your reaction.

Therefore,

Weight water = 348 g

Specific Heat capacity Cp = 2.06 J/g °c

Temperature change ΔT =   127 -103 = 24

Change in enthalpy of the System ΔH = m Cp  ΔT

 = 348 x 2.06 x 24= 17205.12 J.

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If the concentration of H⁺ ions in a solution is 3.16 x 10⁻⁴mol/l. Then the concentration of OH⁻ ions is 3.16 × 10⁻¹¹ mol/l. This is using ionic product of water.

Pure water has low electrolyte strength. It produces protons and hydroxyl ions when it ionizes itself to a very little degree. Water that has self-ionized can be visualized as:

H₂O(l) (acid) + H₂O(l) (base) ↔ H₃O⁺(conjugate acid) + OH⁻(conjugate base)

It demonstrates that water is both a proton donor and an acceptor.

Only a small fraction of the millions of water molecules—which are only minimally ionized—are broken down into H⁺ and OH⁻ ions. Because 1 litre of water equals 1000cc = 1000g and the molar mass of H₂O equals 18gmol⁻¹, the concentration of unionized water molecules, or [H₂O], remains nearly constant (being equivalent to 1000/18=55.55 moles per litre), i.e., [H₂O]= constant.

Kw=[H₃O⁺][OH⁻]

Alternatively, Kw=[H⁺][OH⁻]

An ionic product of water (Kw) is the new constant, which is a result of the equilibrium constant and water concentration.

The concentration of OH⁻ ions can be calculated from the concentration of H⁺ ions using the expression for the ion product of water (Kw):

Kw = [H⁺][OH⁻] = 1 x 10⁻¹⁴ mol/L

Given the concentration of H⁺ ions and presuming that the solution is in equilibrium, we can solve for the concentration of OH⁻ ions:

[H⁺][OH⁻] = 3.16 x 10⁻⁴ mol/L × [OH⁻]

= (1 x 10⁻¹⁴mol/L)/ (3.16 x 10⁻⁴ mol/L)

[OH⁻] = 3.16 x 10⁻¹¹ mol/L

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.

In this question, we have:

31.1 grams of O2

84.3 grams of F2

94.9 L of total volume

55.77°C of temperature which is equal to 328.92 K

Now, to find the pressure of this container, we can find the number of moles of each gas, and add both values together making it one value of moles and then we will use the Ideal gas law to find the pressure, so let's start with O2

The molar mass of O2 is 32g/mol and we have 31.1 grams

32g = 1 mol

31.1g = x moles

x = 0.972 moles of O2

Now for F2, the molar mass is 38g/mol, and we have 84.3 grams

38g = 1 mol

84.3g = x moles

x = 2.22 moles of F2

Now we add these values, 0.972 + 2.22 = 3.192 moles

And now we can use the ideal gas law formula:

PV = nRT

Remember that R is the gas constant, 0.082

P * 94.9 L = 3.192 * 0.082 * 328.92

94.9P = 86.1

P = 0.91 atm

Answer:

an energy source

Explanation:

Scientists improved Mendeleev’s early periodic table by using atomic number instead of atomic mass to organize the elements. Option C

We know that the periodic table is the arrangement of the elements by the use of a definite sequence. The order of the arrangement of the elements would be determined in a given manner.

In the Mendeleev’s periodic table, the arrangement of the elements was on the basis of the masses of the elements. This method did not produce a consistent pattern for all the elements.

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Answer:using atomic number instead of atomic mass to organize the elements