how is a new element formed in a star?

The correct answer to your question is option 2, which states that a dissolution process is exothermic if the amount of energy released in bringing about solute-solute interactions is greater than the sum of the amounts of energy absorbed in overcoming crystal lattice and solvent-solvent interactions.

To understand this concept better, we need to understand what happens during the dissolution process. When a solute dissolves in a solvent, the solute particles break away from their crystal lattice structure and mix with the solvent particles. This process involves overcoming the attractive forces between the solute particles (solute-solute interactions) and the attractive forces between the solvent particles (solvent-solvent interactions). At the same time, energy is released when the solute particles interact with the solvent particles (solvent-solute interactions).
In an exothermic dissolution process, the energy released due to solvent-solute interactions is greater than the energy required to overcome the crystal lattice and solvent-solvent interactions. This means that more energy is released than absorbed, resulting in a net release of heat. This is because the attractive forces between the solute and solvent particles are stronger than the forces holding the solute particles in their crystal lattice structure.
Overall, the exothermic nature of a dissolution process depends on the balance between the energy released and absorbed during the process. By understanding the interactions between solute and solvent particles, we can predict whether a dissolution process will be exothermic or endothermic.

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Answer:

Hubble's Law

Explanation:

search it!!

Answer:

More Stars are being made expaning the universe new galaxys are being made by stars,dust and dark matter.

Answer:

I dont know

Explanation:

because I dont know

Explanation:

Because the difference in energy between orbits is different in different types of atoms, moving electrons between different orbits requires photons carrying different amounts of energy (different wavelengths).

Answer:

This means that the metal is more properly viewed as an array of positive ions surrounded by a “sea of mobile valence electrons.” Electrons which are capable of moving freely throughout the empty orbitals of the metallic crystal are called delocalized electrons (Figure below).

The statement ,Lewis dot diagram having 1 calcium atom and 1 oxygen atom to form an ionic bond is true.

Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.

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Answer:

A true

Explanation:

Answer:

silicon (S)

Explanation:

Answer:

b. Fluorine (FI)

Explanation:

From the given choices, only fluorine wants to gain valence electrons while bonding.

This is because fluorine is the most electronegative specie from the given choices. An electronegative substance have a high tendency to attract electrons to itself in a bond.

Answer:

Food Processing Plant

Explanation:

The lysosomes contain digestive enzymes that break down large food particles into sugars and other simple substances that can be used more easily as does a food processing plant that processes large quantities of food entering the city into smaller packages that can be used more easily.

Answer:

When the frozen popsicle sitting outside in the Sun is exposed to warm air, energy will travel between the popsicle and the warm air as follows;

1) Convection current

Heat will be gained by the frozen popsicle by coming into contact with fresh warm air as the air flows around the popsicle while the cooling of the warm air will cause the water vapor in the air to condense and form the visible mist

In turn the popsicle will gain heat resulting in melting of the ice

2) Conduction

As the some of the mist from the air settles on the popsicle, they share their heat resulting further melting of the popsicle

3) Radiation

Radiated heat energy from the Sun is absorbed by the popsicle resulting in the melting of the popsicle

Explanation:

To make a 50.0 mL solution of 1.7 M sodium carbonate (Na₂CO3), we need to determine the mass of Na₂CO3 required.

To calculate the mass of Na₂CO3 needed, we can use the formula:

Mass = Concentration x Volume x Molar Mass

First, we convert the given volume from milliliters to liters:

Volume = 50.0 mL = 50.0/1000 L = 0.05 L

Next, we substitute the given concentration and volume values into the formula:

Mass = 1.7 M x 0.05 L x Molar Mass of Na₂CO3

The molar mass of Na₂CO3 can be calculated by adding the atomic masses of sodium (Na), carbon (C), and three oxygen (O) atoms:

Molar Mass of Na₂CO3 = (2 x Atomic Mass of Na) + Atomic Mass of C + (3 x Atomic Mass of O)

After obtaining the molar mass value, we can substitute it into the formula and perform the calculation to determine the mass of Na₂CO3 required to make the 50.0 mL solution of 1.7 M sodium carbonate.

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The diagram represents a (c) nuclear fission reaction because an atom is splitting into two large fragments of comparable mass.

Nuclear fission is a type of nuclear reaction in which the nucleus of an atom splits into two or more smaller fragments. This process is often accompanied by the release of a significant amount of energy. In the diagram, a small ball heading toward a large circle labeled superscript 235 upper U indicates the incident neutron or particle that triggers the fission reaction.

The arrow pointing to an irregular circle labeled superscript 236 upper U represents the nucleus of uranium-236, which is the result of the fission of uranium-235. Uranium-235 is a fissile isotope that can undergo fission when bombarded by a neutron. The irregular circle indicates the nucleus undergoing fission.

The starburst, partially overlaid by two blobs labeled superscript 92 upper K r and superscript 141 upper B a, represents the fission products. During nuclear fission, the nucleus of uranium-236 splits into two large fragments, in this case, krypton-92 and barium-141. These fragments are often radioactive and contribute to the release of energy during the fission process.

The three small balls heading away from the starburst represent the release of additional neutrons during the fission reaction. These neutrons can go on to initiate further fission reactions in a chain reaction, contributing to the sustained release of energy.

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Answer:wine

Explanation:it’s made from grapes

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.

The tissue that plays this outer covering of a plant for is the  epidermis and its waxy cuticle. It prevents damage to the plant.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

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Answer: They are all odorless, colorless, monatomic gases with very low chemical reactivity.

Explanation: Plz give brainliest

Answer:

0.02L

Explanation:

Using the formula V1/T1 = V2/T2

Given

V1 = 0.5L

T1 = 25 degrees

T2 = 1 degree

V2 =?

Substitute

0.5/25 = V2/1

Cross multiply

25V2 = 0.5

V2 = 0.5/25

V2 = 0.02L

Hence the new volume will be 0.02L

Based on the hypothetical ΔG°f values provided and the calculation performed, the standard Gibbs free energy change (ΔG°) for the reaction \($C_9H_8O_4(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + C_9H_7O^-_4(aq)\) is determined to be 0 kJ/mol.

To calculate the standard Gibbs free energy change (ΔG°) for the reaction, we can use the standard Gibbs free energy of formation (ΔG°f) values for the compounds involved. The reaction can be written as:

\($C_9H_8O_4(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + C_9H_7O^-_4(aq)$\)

The standard Gibbs free energy change for the reaction (ΔG°) is related to the standard Gibbs free energy of formation (ΔG°f) of the products and reactants by the equation:

ΔG° = ΣΔG°f(products) - ΣΔG°f(reactants)

First, we need to look up the ΔG°f values for each compound involved in the reaction.

Let's assume the following hypothetical ΔG°f values:

\($\Delta G^\circ_f(C_9H_8O_4(aq)) = -100 , \text{kJ/mol}$\)

\($\Delta G^\circ_f(H_2O(l)) = -50 , \text{kJ/mol}$\)

\($\Delta G^\circ_f(H_3O^+(aq)) = -80 , \text{kJ/mol}$\)

\($\Delta G^\circ_f(C_9H_7O^-_4(aq)) = -70 , \text{kJ/mol}$\)

Using these hypothetical values, we can calculate the ΔG° for the reaction:

\($\Delta G^\circ = [\Delta G^\circ_f(H_3O^+(aq)) + \Delta G^\circ_f(C_9H_7O^-_4(aq))] - [\Delta G^\circ_f(C_9H_8O_4(aq)) + \Delta G^\circ_f(H_2O(l))]$\)

\($\Delta G^\circ = [-80 , \text{kJ/mol} + (-70 , \text{kJ/mol})] - [-100 , \text{kJ/mol} + (-50 , \text{kJ/mol})]$\)\($\Delta G^\circ = -150 , \text{kJ/mol} + 150 , \text{kJ/mol}$\)

\($\Delta G^\circ = 0 , \text{kJ/mol}$\)

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The percent yield of oxygen in this chemical reaction is 73.40%.

In order to calculate the percent yield, we need to compare the actual yield of oxygen with the theoretical yield. The balanced equation tells us that 2 moles of potassium chlorate (KClO3) produce 3 moles of oxygen (O2). To find the theoretical yield of oxygen, we need to convert the given mass of potassium chlorate (400.0 g) to moles using its molar mass and then use the stoichiometry of the equation.

The molar mass of KClO3 is calculated as:

K: 39.10 g/mol

Cl: 35.45 g/mol

O: 16.00 g/mol

3 O atoms: 3 * 16.00 g/mol = 48.00 g/mol

Total molar mass of KClO3 = 39.10 g/mol + 35.45 g/mol + 48.00 g/mol = 122.55 g/mol

Using the given mass of 400.0 g and the molar mass, we can calculate the number of moles of KClO3:

400.0 g / 122.55 g/mol ≈ 3.263 mol

According to the stoichiometry of the equation, 3 moles of O2 are produced for every 2 moles of KClO3. Therefore, the theoretical yield of oxygen is:

(3.263 mol KClO3 / 2 mol KClO3) * (3 mol O2) ≈ 4.895 mol O2

The actual yield of oxygen is given as 115.0 g. To calculate the percent yield, we divide the actual yield by the theoretical yield and multiply by 100:

(115.0 g / 4.895 mol) * 100 ≈ 2351%

Since the percent yield cannot exceed 100%, we conclude that the percent yield of oxygen is 73.40%.

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Hence it has taken 1 electron

Now first look at EC of Fluorine(F)

\(\\ \bull\sf\dashrightarrow 1s^22s^22p^5\)

Look at the EC

\(\\ \bull\sf\dashrightarrow 1s^22s^22p^6\)

Or

\(\\ \bull\sf\dashrightarrow [He]\)

Option C is correct.

Answer: c. so that you use the correct energy states

Explanation:

Enthalpy is the energy release or energy produced when a chemical reaction is carried out.

Enthalpy change is calculated by substracting the energy of reactants from the energy of products.

\(\Delta H=H_{products}-H_{reactants}\)

As the energies are different for different states and thus the correct stale symbols in your balanced chemical equation must be given so that we use the correct energy values.

Answer:

Boiling point of H2S is (-60.2 C°)

Explanation:

This is very less than water because hydrogen bonding is present in water that is absent in H2S

Using the specified mass and each compound's respective molecular weights, we can compare the number of moles of each compound:

CH4O: Methyl alcohol has a molecular weight of about 32 g/mol.The formula for calculating the number of moles of CH4O is (mass of CH4O) / (molecular weight of CH4O): 2.0 g / 32 g/mol = 0.0625 moles.
H2O: H2O (water) has a molecular weight of about 18 g/mol.H2O's mass divided by its molecular weight yields the number of moles: 2.0 g divided by 18 g/mol, or 0.111 moles.
CHO: CHO (formaldehyde) has a molecular weight of about 30 g/mol.The formula for calculating the number of moles of CHO is (mass of CHO) / (molecular weight of CHO): 2.0 g / 30 g/mol = 0.067 moles.Consequently, the chemicals are CH4O CHO H2O in ascending molecular weight order.


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Electrons distribution in shells:

First shell - 2 electrons

Second shell - 8 electrons

Third shell - 18 electrons

Fourth (valence shell) - 3 electrons

Explanation:

The group number of an element can be found by finding its number of valence shell electrons.

According to the electrons distribution in shells, the valence shell has 3 electrons

Hence element M will be in the third group of the periodic table

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Answer:

Explanation:

distance =50m = 0.0311 mile

Time= 21.93 seconds/3600 =0.00609 hour

Speed=?

The plot of ln[H2O2] vs time being linear indicates that the reaction is first-order with respect to H2O2. In a first-order reaction, the slope of the plot is equal to the negative of the rate constant (k).

Based on the given information, we can determine the order of the reaction with respect to H2O2 and the rate constant.
The slope of the linear plot of ln[H2O2] vs time is equal to the negative of the rate constant (k). So,
slope = -k = -3.70 × 10−3 s−1

Therefore, the rate constant for the reaction is k = 3.70 × 10−3 s−1.

The order of the reaction with respect to H2O2 can be determined by examining the integrated rate law for the reaction. Assuming the reaction is first order with respect to H2O2, the integrated rate law would be:

ln[H2O2]t = -kt + ln[H2O2]0
where [H2O2]t is the concentration of H2O2 at time t, [H2O2]0 is the initial concentration of H2O2, and k is the rate constant.

Since the plot of ln[H2O2] vs time is linear, we can use the integrated rate law to determine the order of the reaction. If the plot is linear, then the reaction must be first order with respect to H2O2.

Therefore, the order of the reaction with respect to H2O2 is 1st order and the rate constant for the reaction is 3.70 × 10−3 s−1.

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Answer:

The basis of the separation by steam distillation is that while the water and organic condensed phases are immiscible, the vapors of both are miscible. Once condensed, the two separate again allowing for an easy separation. As noted above, both liquids and solids can be distilled by steam.

Explanation:

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The proton number has the highest value in the ion

In an atomic element Q, the mass number is the number of the proton and the neutron, the electron encircles around the nucleus of the atomic element.

Recall that:

∴

The atomic element Q+ has a positively charged ion, Thus, the proton number in the mass of the atomic element Q, therefore, has the highest value in the ion.

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Answer:

B.

Explanation:

1 orbital is 4 half of 4 is 2.

The quantity of deer is a dependent variable, whereas time is an independent variable.

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