2. When a substance changes phase from a gas to a solid, what happens to its density?

Heavier elements will undergo fission in order to b. decrease total binding energy. Fission is a nuclear reaction in which a heavy nucleus splits into two or more lighter nuclei.

During this process, some of the mass is converted into energy, which can be harnessed to generate electricity. However, fission also results in a decrease in the total binding energy of the nucleus.
The total binding energy of a nucleus is the energy required to break apart all of its nucleons (protons and neutrons). It is a measure of the stability of the nucleus. Heavier elements have higher total binding energies, but they are also less stable. By undergoing fission, these elements can reduce their total binding energy and become more stable.
Fission also results in an increase in binding energy per nucleon. This is because the lighter nuclei produced by fission have a higher binding energy per nucleon than the original nucleus. This increase in binding energy per nucleon is what releases energy during the fission process.
In summary, heavier elements undergo fission in order to decrease their total binding energy and become more stable. This process also results in an increase in binding energy per nucleon, which releases energy that can be used for practical applications.

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Answer: increase binding energy per nucleon

Americans produce 10 times the amount of solid waste produced by most less-developed countries.

Any kind of garbage, trash, refuse, or discarded material is referred to as solid waste. Municipal solid waste is a category of waste made up of common objects that are dumped by the general public and is often referred to as trash, garbage, or rubbish in the United States and the United Kingdom. In a garbage disposal, the term "garbage" can also apply particularly to food waste; the two are occasionally collected separately.

All materials from homes and businesses that people no longer need are referred to as municipal solid waste (MSW). They include things like food, paper, plastics, textiles, leather, wood, glass, metals, sanitary waste in septic tanks, and other wastes. These wastes are also referred to as trash or garbage.

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Answer:

True

Explanation:The whole point of and expirement is to test the indepedent variable and the outcom or what your measuring is the dependent

sorry for the tone its late where i live

The force equal but opposite to the one shown is : ( D ) The force that the branch applies to the kitten

The force of gravity/weight of an object is equal and opposite to the reactive force because it cancels the effect of the weight of the object on the surface. In option D the force that the branch applies to the kitten resting on it is equal and opposite to the weight of the kitten.

Hence we can conclude that The force equal but opposite to the one shown is  The force that the branch applies to the kitten.

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Your questio lacks the diagram but I have provided a general answer within the contest of your question

The electron in the ground state of an infinite potential energy well has an energy of 6.1 eV. To jump from the ground state to the first excited state, the electron must be supplied with an additional energy of 3.4 eV.

The energy levels of an electron in an infinite potential energy well are quantized, meaning that they can only have certain values. The ground state energy is the lowest energy level, and the first excited state is the next highest energy level. The difference in energy between the two states is 3.4 eV.

To jump from the ground state to the first excited state, the electron must absorb a photon with an energy of 3.4 eV. The photon will be emitted when the electron falls back to the ground state.

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Al2O3: ionic bonding  F2: London dispersion forces  H2O: hydrogen bonding  Br2: London dispersion forces  Icl: London dispersion forces and dipole-dipole interactions  Nacl: ionic bonding. these are the intermolecular forces found in the molecules , order of molecules based on boiling point is Al2O3 Nacl H2O ICl F2 Br2

The intermolecular forces that predominate in a substance determine the physical properties of that substance, such as its boiling point. The relative strength of these forces is determined by the type of bond present in the substance and the polarity of the molecules. ionic bonding, as found in Al2O3 and Nacl, is the strongest type of intermolecular force. It occurs when positively and negatively charged ions are attracted to each other, forming a crystal lattice. Because of the strong electrostatic forces between the ions, substances with ionic bonding have very high melting and boiling points.Hydrogen bonding, as found in H2O, is the next strongest intermolecular force. It occurs when a hydrogen atom, covalently bonded to a highly electronegative atom (such as oxygen or nitrogen), is attracted to another electronegative atom. This creates a temporary dipole-dipole interaction, which is weaker than ionic bonding but still strong enough to give substances with hydrogen bonding high boiling points. Dipole-dipole interactions, as found in ICl, occur when polar molecules are attracted to each other. These interactions are weaker than hydrogen bonding, so substances with dipole-dipole interactions have lower boiling points.London dispersion forces, as found in F2, Br2, and ICl, are the weakest type of intermolecular force. They are temporary forces that arise due to the random motion of electrons in a molecule, causing a temporary dipole. Because they are so weak, substances with London dispersion forces have very low boiling points.

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Answer: Flow rate is inversely proportional to viscosity.

Explanation: The relation is called Poiseuille's law, which describes the smooth flow of a fluid along a tube.

Answer:

Viscosity is a fluid's resistance to flow and flow rate is the volume of fluid that passes by a point in a certain amount of time. Viscosity and flow rate are similar because they are inversely proportional; high viscosity means a decreased flow rate and vice versa.

Answer: During succession, new species move into an area and colonize it.

Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.

Answer:

\(\%Ca=19.378\%\)

Explanation:

¡Hola!

En este caso, basado en la información dada, es posible conocer la masa de calcio en carbonato de calcio, que de hecho es la misma en la muestra, al utilizar el siguiente esquema de cálculo:

\(m_{Ca}=1,2093gCaCO_3*\frac{1molCaCO_3}{100.1gCaCO_3}*\frac{1molCa}{1molCaCO_3}*\frac{40.1gCa}{1molCa}\\\\m_{Ca}=0.48444gCa\)

Finalmente, calculamos el porcentaje requerido como sigue:

\(\% Ca=\frac{0.48444g}{2.5000g} *100\%\\\\\%Ca=19.378\%\)

¡Saludos!

In the preceding equation, 6.67 moles of boric acid (\(H_3BO_3\)) will react to generate 10 moles of water (\(H_2O\)).

To determine the number of moles of boric acid that react in the equation to produce 10 moles of water, we need to examine the balanced chemical equation and use stoichiometry.

1. Begin by examining the balanced chemical equation for the reaction involving boric acid and water. Let's assume the equation is:

  \(3H_2O\) + \(3H_2O\) -> \(B_2O_3\) + \(6H_2O\)

2. From the balanced equation, we can see that 2 moles of boric acid (H3BO3) react with 3 moles of water (\(H_2O\)) to produce 6 moles of water (\(H_2O\)).

3. Use the given information that 10 moles of water (\(H_2O\)) are produced. Since the stoichiometric ratio between boric acid and water is 2:3, we can set up a proportion to find the number of moles of boric acid:

  2 moles \(H_3BO_3\) / 3 moles \(H_2O\) = x moles \(H_3BO_3\) / 10 moles \(H_2O\)

4. Cross-multiply and solve for x:

  (2 moles \(H_3BO_3\))(10 moles \(H_2O\)) = (3 moles \(H_2O\))(x moles \(H_3BO_3\))

  20 moles \(H_2O\) = 3x moles \(H_3BO_3\)

5. Divide both sides of the equation by 3 to isolate x:

  x moles \(H_3BO_3\) = (20 moles \(H_2O\)) / 3

6. Calculate the value of x:

  x moles \(H_3BO_3\) ≈ 6.67 moles \(H_3BO_3\)

Therefore, approximately 6.67 moles of boric acid (\(H_3BO_3\)) will react to produce 10 moles of water (\(H_2O\)) in the given equation.

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Answer:

It is a method used to identify a suspect.

Explanation:

DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.

Answer:

Fractional distillation

Explanation:

Crude oil, also known as petroleum, is a naturally occurring substance found in the Earth's crust. It is a mixture of different useful substances. These substances are separated from one another based on their individual boiling points in a process called FRACTIONAL DISTILLATION.

The process of fractional distillation entails the application of heat to the crude oil. The different fractions evaporate and condense in the fractionating column depending on their boiling point. The hydrocarbon substances separated are called fractions, and they include bitumen, diesel, kerosene, gasoline, natural gas etc. Therefore, before we can use gasoline (petrol) in our cars, the crude oil needs to be separated into separate products like plastics and ink. This process is called FRACTIONAL DISTILLATION.

Answer:

B.) Na₂SO₄

Explanation:

Covalent bonds are bonds which involve electrons being shared between two atoms. These bonds only occur between nonmetals.

Ionic bonds are bonds which involve electrons being given or taken by two atoms. These bonds form between a metal and a nonmetal.

NH₃ contains nitrogen and hydrogen, two nonmetals. Therefore, this molecule only contains covalent bonds.

Na₂SO₄ has both covalent and ionic bonds. The covalent bonds are found within the polyatomic ion, SO₄²⁻. Sulfur and oxygen are both nonmetals, thus covalently combining. The ionic bond forms between the  Na⁺ and SO₄²⁻. Sodium (Na) is a metal which wishes to give up electrons to have a complete octet. SO₄²⁻ serves as the anion which it bonds with.

CH₃COOH contains hydrogen, carbon, and oxygen. All of these are nonmetals, thus the only bonds formed are covalent.

NaCl contains sodium, a metal, and chlorine, a nonmetal. Therefore, this compound is held together by an ionic bond.

Answer:

It's 0.2556054185018347 moles

Answer:

Doctors will use other drugs that are known to be able to treat TB, even if they are less effective than the common drugs.

Explanation:

When a case of drug resistance is established, the doctor has to change the prescription and give other drugs that are also known to be effective against the organism.

Bacterial drug resistance is a common clinical experience. Many established drugs have been found to be ineffective in treating common infections leading to the continuous quest for improved antibiotics that are active against most organisms.

When doctors discover that someone who has an active case of drug-resistant tuberculosis, the doctor may need to change the prescription to other drugs that are also known to be effective against Mycobacterium tuberculosis, the causal agent of tuberculosis.

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Answer:

the force resisting motion. it slows things down

Answer:

Explanation:

Ya que las cargas eléctricas opuestas se atraen, las moléculas de agua tienden a atraerse unas a otras, haciendo el agua "pegajosa," como lo muestra el diagrama del lado derecho. Cuando las moléculas de agua se atraen unas a otras, se unen. Esta es la razón del porqué se forman las gotas

The solution was calculated to have a boiling point of 100.167 °C.

To calculate the boiling point of the solution, use the equation:

ΔTb = Kb × m

where ΔTb = change in boiling point, Kb = boiling point elevation constant for water (0.512 °C/m), and m = molality of the solution.

First, calculate the molality of the solution:

molality (m) = moles of solute / mass of solvent (in kg)

mass of solvent = 2750 g / 1000 = 2.75 kg (conversion to kg)

moles of solute (K3PO4) = 0.900 moles

m = 0.900 / 2.75 = 0.327 mol/kg

Now calculate the boiling point elevation:

ΔTb = Kb × m = 0.512 °C/m × 0.327 mol/kg = 0.167 °C

Finally, calculate the boiling point of the solution:

boiling point of solution = boiling point of pure solvent + ΔTb

The boiling point of pure water is 100 °C, so:

boiling point of solution = 100 °C + 0.167 °C = 100.167 °C

Therefore, the boiling point of the solution is 100.167 °C.

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These factors contribute to the high energy content of nucleoside triphosphates, allowing them to effectively serve as an energy source for various cellular processes.

The factors that account for the high phosphoryl-transfer potential of nucleoside tri-phosphates in your answer.The high phosphoryl-transfer potential of nucleoside triphosphates, such as ATP, can be attributed to several factors: Electrostatic repulsion: The negatively charged phosphate groups repel each other, creating a high-energy state that can be released upon hydrolysis.

Resonance stabilization: Upon hydrolysis, the products (ADP and inorganic phosphate) have more resonance structures, which increases their stability and releases energy. Hydration: The hydrolysis products can interact more favorably with water molecules, increasing the stability and releasing energy.

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To calculate the amount of heat produced when propanol burns in oxygen, we need to use the balanced chemical equation for the combustion of propanol.

The balanced equation tells us that for every mole of propanol that reacts, 5 moles of oxygen are consumed and 3 moles of carbon dioxide and 4 moles of water are produced.

\(C3H7OH + 5O2 \rightarrow 3CO2 + 4H2O\)

To find the amount of heat produced, we need to use the standard enthalpy of formation values for the reactants and products in the balanced equation.

The standard enthalpy of formation is the heat change that occurs when one mole of a substance is formed from its constituent elements in their standard states at a given temperature and pressure.

Using the standard enthalpy of formation values, we can calculate the heat of reaction using the following equation:

\(\Delta H\) = ∑( \(\Delta H\) f° products) - ∑(\(\Delta H\)f° reactants)

Where \(\Delta H\) is the heat of reaction, and \(\Delta H\) If° is the standard enthalpy of formation of the respective substance.

For propanol, \(C_3H_7OH\) , the standard enthalpy of formation is  \(-302.0 kJ/mol.\)

For carbon dioxide, \(CO_2\) , the standard enthalpy of formation is  \(-393.5 kJ/mol.\)

For water, \(H_2O\) , the standard enthalpy of formation is \(-285.8 kJ/mol.\)

Since we have  \(58.5g\) of propanol, we can first calculate the number of moles of propanol:

\(n = m/M\)

where m is the mass of propanol and M is its molar mass.

M(C3H7OH) \(= 3(12.01 g/mol) + 8(1.01 g/mol) + 1(16.00 g/mol) = 60.10 g/moln = 58.5 g / 60.10 g/mol = 0.974 mol\)

From the balanced equation, we know that \(0.974 mol\) of propanol reacts with 5 times that amount, or  \(4.87 mol\) of oxygen.

Using the standard enthalpy of formation values, we can calculate the heat of reaction:

ΔH  \(= (3 mol CO2 × -393.5 kJ/mol CO2) + (4 mol H2O × -285.8 kJ/mol H2O) - (1 mol C3H7OH × -302.0 kJ/mol C3H7OH)= -2220.7 kJ\)

Therefore, the heat produced when \(58.5 g\) of propanol burns in excess oxygen is - \(2220.7 kJ\), or approximately  \(-2.22 × 10^3 kJ\) . Note that the negative sign indicates that the reaction is exothermic, meaning that heat is released during the reaction.

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Answer: for the first question, Hypochloride is being released from your bleach to oxidize your fabric. As you know oxidation simply mean addition of oxygen, so when hypochloride (ClO-) comes in contact with fabric oxygen is added and some organic bonds are broken and the dirt is washed out.

For the second question. The melting and boiling point of pure substance is sharp. Like water has 100oC boiling point and OoC melting point. So anything from that means it has impurities in it. Just like if you make tea, you have introduce something else into the water, if you should try boiling your tea, you'll find out that the boiling point is not going to 100oC anymore. Every other liquid have their boiling point and melting point. When you know them, you'll be able to determine the purity.

Answer:

characteristic

Explanation:

Answer:

a

Explanation:

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Answer:

(i) To calculate the number of moles of sodium thiosulphate present in the solution, we can use the formula:

moles = concentration x volume

The concentration of the sodium thiosulphate solution is given as 0.100 mol dm^-3 and the volume is 36.0 cm^3.

We can calculate the number of moles of sodium thiosulphate as:

moles = 0.100 mol dm^-3 x (36.0 cm^3 / 1000 cm^3/dm^3) = 0.0036 mol

(ii) We are told that six moles of sodium thiosulphate were needed for each mole of sodium iodate(V). So, we can calculate the number of moles of sodium iodate(V) in the sample as:

moles of sodium iodate(V) = moles of sodium thiosulphate / 6

moles of sodium iodate(V) = 0.0036 mol / 6 = 6.00 x 10^-4 mol

(iii) To calculate the concentration of the sodium iodate(V) solution in mol dm^-3, we can use the formula:

concentration = moles of solute / volume of solution

The number of moles of sodium iodate(V) is 6.00 x 10^-4 mol and the volume of the solution is 50.0 cm^3.

so,

concentration = 6.00 x 10^-4 mol / (50.0 cm^3 / 1000 cm^3/dm^3) = 1.2 x 10^-4 mol dm^-3

(iv) To calculate the concentration of the sodium iodate(V) solution in g dm^-3, we can use the formula:

concentration in g dm^-3 = molar mass x concentration in mol dm^-3

The molar mass of sodium iodate(V) is 198 g/mol.

so,

concentration in g dm^-3 = 198 g/mol x 1.2 x 10^-4 mol dm^-3 = 0.00237 g dm^-3

This is the final concentration of sodium iodate(V) solution in g dm^-3.

Answer:

Closed-toe shoes, long pants, a lab coat, safety glasses with side shields or splash goggles, and gloves.

Explanation:

Answer:

Carbon dioxide - CO.

Benzene - C6H.

Carbon tetrachloride - CCl.

Methane - CH.

Ethylene - C2H.

Explanation: Some examples of atoms with nonpolar convalent bonds. Hope this was found useful!!

Non polar covalent compounds have no net dipole moment due to charge separation. Some examples are, CO₂, H₂, N₂,O₂ etc.

Covalent bonds are formed by the sharing electrons between atoms. Covalent bond is comparatively weaker than ionic bonds. Atoms of deficient number of electrons will combine by sharing their valence electrons and forms covalent bonds.

When one atom has more electronegativity, then the shared pair of electrons will  attracted into the electronegative atom. This creates a charge separation and a dipole moment.

However, if the electronegative atoms are linear in geometry from the central less electronegative atom then the dipole moment cancel each other and the compound become non polar as in the case of CO₂.

All gases in molecular states are covalently bonded and are non polar such as H₂, N₂,O₂ etc.

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