how much energy (in j ) is contained in 1.00 mole of 747 nm photons?

According to law of definite proportions, chemical compound always includes its constituent components in a fixed ratio.

The law of definite proportions, also known as Proust's law or the law of constant composition, holds that no matter the source or technique of manufacture, a particular chemical compound always includes its constituent components in a fixed ratio.

When two elements are combined to form a compound, their mass proportions are always the same. For instance, oxygen makes up roughly 8/9 of both the mass of just about any samples of pure water, and hydrogen make up the remaining 1/9.

Therefore, according to law of definite proportions, chemical compound always includes its constituent components in a fixed ratio.

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The solubility of the potassium nitrate will increase as we increase the temperature because increases the kinetic energy of solute particles. More KNO₃ will dissolve in the solution and makes it unsaturated.

Solubility can be described as the maximum amount of Solute that can dissolve in a known quantity of solvent at a particular temperature. By changing the temperature we can increase the solubility of a solute. Sparingly soluble solids or liquids can be completely liquified by raising the temperature.

Solid solubility depends on the nature of the solute and the solvent. Substances such as sugar, common salt (NaCl), etc dissolve in water while substances such as naphthalene do not dissolve in water.

The solubility of potassium nitrate KNO₃ increases with an increase the temperature but the increasing temperature of NaCl solution does not show much change in the solubility of NaCl.

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The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

Aluminum chloride is useful for the treatment of palmar, plantar, and axillary hyperhidrosis.

Aluminum chloride has also been reported to be useful in facial and scalp hyperhidrosis

The balanced chemical equation represents the mole ratio in which the chemicals combine.

In this case, illustrates that 2 mol Al produces 2 mol Al Cl₃, hence these 2 chemicals are in a 1:1 ratio.

Thus, to produce 8.70 mol aluminium chloride, it will require 8.70 mol aluminium.

But this quantity of Al has a mass in grams of

m = n × Mr

   = 8.70 mol × 27g/mol

   = 234.9 g

Hence, The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

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9) The reaction is spontaneous as written

10) The reaction is not spontaneous as written

A spontaneous reaction is a chemical reaction that occurs without the need for an external energy input, such as heat or electricity. It is a reaction that occurs naturally, without any outside assistance, and proceeds on its own without the need for additional energy to be added to the system.

It is important to note that a spontaneous reaction does not necessarily mean that the reaction will occur quickly or with a high rate. The rate of a reaction depends on various factors, such as the concentration of reactants, temperature, and the presence of catalysts.

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The changes observed in the mixing of copper and silver nitrate, zinc and hydrochloric acid, and lead(II) nitrate and potassium iodide are all chemical changes.

A chemical change involves the formation of new substances with different chemical properties from the original substances. In the case of the mixing of copper and silver nitrate, a chemical change occurs. When copper reacts with silver nitrate, a displacement reaction takes place. Copper displaces silver from silver nitrate and forms copper(II) nitrate while silver precipitates out as a solid. This chemical reaction results in the formation of new compounds with different chemical compositions than the reactants.

Similarly, when zinc is mixed with hydrochloric acid, a chemical change occurs. Zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas. This reaction is also a displacement reaction, where zinc displaces hydrogen from hydrochloric acid. The formation of new compounds and the release of a gas are clear indications of a chemical change.

In the case of the mixing of lead(II) nitrate and potassium iodide, another chemical change takes place. A double displacement reaction occurs, leading to the formation of lead(II) iodide, which is a yellow precipitate, and potassium nitrate. This reaction involves the exchange of ions between the reactants, resulting in the formation of new compounds with different chemical properties.

Overall, the changes observed in all three scenarios involve the formation of new substances with distinct chemical compositions and properties. These chemical reactions indicate that a chemical change has taken place.

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The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs.

Answer:True

Explanation: Moment magnitude is used by the USGS- it is based on the total moment release of the earthquake. Moment is a product of the distance and the force. The moment magnitude scale gives an esitmate of the total energy released from the earthquake

Radioactivity is the spontaneous decay in the structure of an atom's nucleus.

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Answer:It is always greater than the actual mechanical advantage because all machines must overcome friction. The mechanical advantage of a machine may be greater than, less than, or equal to 1, depending on the type of machine.

answer is below!! hope this helped

A 6.0-V battery does 1200 J of work transferring charge, then 100C charge is transferred.

One or more electrochemical cells with external connections for powering electrical equipment make up an electric battery, which is a source of electric power.

A battery's positive terminal serves as the cathode and its negative terminal serves as the anode when it is delivering electricity.

Electricity is accepted, stored, and released on demand by batteries and similar devices. Like many other common energy sources, batteries store energy through chemistry in the form of chemical potential.

For instance, until they are burned, logs store energy in their chemical bonds for later conversion to heat.

V = 12 V

W = 1200 J

q = ?

V = W / q

12 = 1200 / q

q = 100 C

Thus, A 6.0-V battery does 1200 J of work transferring charge, then 100C charge is transferred.

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Cis; Trans stereoisomers. In simple alkenes, these stereoisomers are labeled as cis and trans, respectively.

Isomers are compounds with the same molecular formula but different structural arrangements. In alkenes, a subtype of isomers is observed, where the only difference is the relative position of groups attached to the double-bonded carbons. These are called stereoisomers. In simple alkenes, these stereoisomers are labeled as cis (having two identical groups on the same side) and trans (having two identical groups on opposite sides). Therefore, the answer is cis; trans stereoisomers.

The two alkenes that have the same molecular formula but different relative positions of groups attached to the double-bonded carbons are called stereoisomers. In simple alkenes, these stereoisomers are labeled as cis and trans, respectively.

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Answer: 0.910 moles NA+

Definition: of Like Decimal: Two or more decimal fractions are called like ... 0.910; 10.819; 89.637; 142.800 (b) 12.01; 180.3; 1446.105; 180.19

The information provided states that a patient receives a gamma scan of his liver after ingesting 3.7 MBq of 198Au. 198Au is a radioactive isotope with a half-life of 2.7 days and decays by emitting a 1.4 MeV beta particle. It is mentioned that 60% of this isotope is absorbed and retained by the liver, and all of the radioactive decay energy is deposited in the liver.

Based on this information, the gamma scan of the patient's liver is used to detect the gamma radiation emitted by the radioactive decay of 198Au. Since 60% of the isotope is absorbed and retained by the liver, it allows for the imaging and visualization of the liver using the gamma radiation emitted from the decay process.

The decay energy deposited in the liver refers to the energy released during the radioactive decay of 198Au. This energy is transferred to the liver tissue, and it is this energy deposition that allows for the detection and imaging of the liver using gamma scanning techniques.

In summary, the patient's liver is scanned using gamma radiation emitted from the decay of the radioactive isotope 198Au, which has been ingested by the patient. The imaging is possible because 60% of the isotope is absorbed and retained by the liver, and the energy released during the radioactive decay is deposited in the liver, allowing for the detection and visualization of the liver tissue.

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A "suspension" is an unstable physical mixture of undissolved particles in a liquid. A suspension is a type of mixture where small, solid particles are dispersed throughout a liquid, but they are not dissolved in the liquid.

These particles will eventually settle to the bottom of the container if left undisturbed, as they are not stable enough to remain suspended for long periods of time. Examples of suspensions include muddy water, blood, and paint. Suspensions can also be seen in pharmaceuticals, where active ingredients are suspended in a liquid medium for easier consumption.

It's important to note that suspensions can be distinguished from solutions, where the particles are fully dissolved in the liquid and do not settle over time. While suspensions may not be as desirable in some applications due to their instability, they can be useful in others, such as in providing targeted drug delivery to specific areas of the body.

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Surface model,we used a supercell of

16.1106×16.1106×18.0 And a model of a 3 × 3

9 atoms..

The reaction between quicklime (calcium oxide, CaO) and water (H2O) to form hydrated lime (calcium hydroxide, Ca(OH)2) is an exothermic reaction.

It releases heat energy, which is why we feel hot when touching the container in which the reaction occurs.

The balanced chemical equation for this reaction can be written as follows:

CaO + H2O → Ca(OH)2

In this equation, one molecule of quicklime (CaO) reacts with one molecule of water (H2O) to produce one molecule of hydrated lime (Ca(OH)2).

The reaction proceeds as follows:

CaO + H2O → Ca(OH)2

Calcium oxide (CaO) is a strong base and reacts with water to form calcium hydroxide (Ca(OH)2). The reaction involves the transfer of hydroxide ions (OH-) from water to calcium oxide, resulting in the formation of calcium hydroxide.

During this process, energy is released in the form of heat. The exothermic nature of the reaction is due to the high enthalpy change associated with the formation of the calcium hydroxide product. The release of heat energy is what causes the container to feel hot when we touch it.

This exothermic reaction is commonly used in various applications, such as in construction materials, agriculture, and water treatment. The heat released during the reaction helps in the curing and hardening of materials and facilitates the production of hydrated lime for various industrial purposes.

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18.22 g of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

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Answer:

A.) Longer and Shorter

Explanation:

If the wavelength of a light wave is shorter that means the frequency will be higher.

That means that longer wavelengths have a lower frequency.

Answer:

Manganese Oxide

Explanation:

Answer:

The answer is, in fact, Calcium Nitrate. I even looked it up to make sure, and according to PubChem, it is Calcium Nitrate. I suggest asking your teacher what this question is trying to ask because if it says it is not Calcium Nitrate, someone got it wrong.

Explanation:

The only other name I can think of, though, is Calcium Dinitrite.

Litmus paper and phenolphthalein indicators have pH range limitations and lack precision. Universal indicator and bromothymol blue are alternative indicators that offer a broader range and greater accuracy.

Litmus paper is a pH indicator that changes color in the presence of an acid or a base. However, it can only indicate whether a substance is acidic (turns red) or basic (turns blue), without providing an accurate pH value. Phenolphthalein, on the other hand, is colorless in acidic solutions and pink in basic solutions, but it has a limited pH range of 8.2 to 10.0.

To overcome these limitations, the universal indicator is commonly used. It is a mixture of several indicators that produces a wide range of colors depending on the pH of the solution. The resulting color can be compared to a color chart to determine the approximate pH value of the substance being tested. This allows for a more precise measurement of pH compared to litmus paper or phenolphthalein.

Another alternative indicator is bromothymol blue. It changes color depending on the pH of the solution, from yellow in acidic solutions to blue in basic solutions. Bromothymol blue has a pH range of 6.0 to 7.6, which makes it suitable for a broader range of pH measurements compared to phenolphthalein.

These alternative indicators, universal indicator and bromothymol blue, provide a wider pH range and more precise measurements compared to litmus paper and phenolphthalein. They offer greater versatility and accuracy in determining the acidity or basicity of a solution.

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When only 1 mol of oxygen was intended to be produced, a process instead yields 4.93 L of oxygen. The percent yield of the reaction is 493%.

Percent yield is a measure of how much of the desired product is produced in a chemical reaction. It is calculated by comparing the actual yield of a product to the theoretical yield, which is the amount of product that would be produced if the reaction were 100% efficient.

To calculate the percent yield, you can use the formula:

= percent yield

= (actual yield / theoretical yield) x 100%

The theoretical yield of a reaction is calculated by multiplying the number of moles of reactant used by the stoichiometry of the reaction. In this case, the reaction is supposed to produce 1 mol of oxygen, which is the theoretical yield. To calculate the actual yield, we can use the Ideal gas law PV = nRT, where P is the pressure, V is the volume, n is the number of mol. Since we know that V = 4.93 L, we can use this information to find n:

= n

= (PV) / RT

The actual yield is 4.93 L of O2 or 4.93 L of any gas at STP (Standard Temperature and Pressure) is equivalent to 4.93 moles of O2.

Then we can use this information to calculate the percent yield:

= percent yield

= (actual yield / theoretical yield) x 100%

= (4.93 moles O2 / 1 mole O2) x 100%

= 493%

So, the percent yield of the reaction is 493%.

It's important to note that a percent yield of greater than 100% is usually an indication of an error in the measurement or calculation of the actual yield, or it could be an indication that the theoretical yield is incorrect.

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Acid rain results when humans put excess amounts of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere.

These pollutants are released primarily from industrial processes and the burning of fossil fuels, which then react with water, oxygen, and other chemicals to form sulfuric acid and nitric acid. These acids then fall to the ground in the form of precipitation, known as acid rain.

Any type of precipitation that contains acidic elements, such as sulfuric or nitric acid, that falls to the ground from the atmosphere in wet or dry forms is referred to as acid rain, also known as acid deposition. This can apply to rain, snow, fog, hail, and even corrosive dust.

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Combine the stoichiometry by a element's subscript to find number of atom.  In 2AI\(_2\)(CO\(_3\))\(_3\), 4 aluminium atom, 3 carbon atom and 9 oxygen atom are there.

Aluminium carbonate is an aluminum carbonate. It is not well defined; according to one reference, simple carbonates of aluminum are unknown.

Yet, similar compounds such as the basic sodium aluminum carbonate solid dawsonite and the hydrated basic aluminum carbonate minerals scarbroite as well as hydroscarbroite are known. To find the number of atoms in an element, combine the stoichiometry by a element's subscript. In  2AI\(_2\)(CO\(_3\))\(_3\), 4 aluminium atom, 3 carbon atom and 9 oxygen atom are there.

Therefore, in  2AI\(_2\)(CO\(_3\))\(_3\), 4 aluminium atom, 3 carbon atom and 9 oxygen atom are there.

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Answer:

20.93%

Explanation:

The percent by mass (%mass) of water in the following compound can be calculated thus:

%mass of H2O = mass of 2H2O/mass of compound × 100

Where;

Ca = 40

S = 32

O = 16

H = 1

Hence, the molar mass of CaSO4•2H20 = 40 + 32 + 16(4) + 2{ 1(2) + 16}

= 40 + 32 + 64+ 2{18}

= 172g/mol

Molar mass of 2H2O = 2{2 + 16}

2(18)

= 36g/lol

Therefore, the percent by mass of 2H2O in CaSO4•2H20 is as follows:

36/172 × 100

= 0.2093 × 100

= 20.93%

Answer:

the answer is

it's true

Answer:

true

Explanation:

it has both neutrons (neutral) and protons (positive)

Answer:

Liquid; melting.

Explanation:

So what is being shown is a phase change diagram. Because we start at an atm of 1.5 (staying steady means that it doesn't drop so we always stay at 1.5 atm) and at a temperature of -150, the original state of matter is a solid. Next, we look at what happens when the temperature goes to 300 degrees, yet still maintaining the 1.5 atm. This means that it now turns into a liquid (based on placement on diagram). This means the matter after the temperature change was a liquid. And going from solid to liquid would be called melting.

Here's an example phase diagram so that you can rely on it in the future problems!

Neutral ph is caused by the percolation of mildly acidic water. The mildly acidic water has a pH of about 6.5-7.0, which is slightly acidic.

Water is a natural resource that is essential for life. It is one of the most important molecules in the universe, and it is the only substance that can exist in all three states: solid, liquid, and gas. Water is necessary for all living things, including plants and animals, to survive. Water sustains life on Earth by serving as a medium for many biochemical processes, such as photosynthesis, respiration, and the transport of nutrients and waste products. It is also necessary for human activities such as drinking, cleaning, cooking, and bathing. In addition, water helps to regulate the Earth's climate and is a valuable resource for recreation and leisure activities.

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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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