Chemical energy isstored in substances(potential energy) butcan be stored orreleased during a _____. I don't know what goes into the blank

Answer:

Orion Nebula

Explanation:

That is an enormous cloud of gas and dust

Answer:

The skillet got rusted.

Explanation:

In the context, Kelly kept the iron skillet in the sink which is full of water. After washing the dishes, she noticed the skillet's color is starting to change. She kept it for dry on the rack but the day later the skillet was ruined and damaged.

It was a chemical and physical change in the property of the metal where the iron skillet which was kept in the sink full of water oxidized due to the water content and the iron got oxidized to form form iron oxide which is known as rust. It damages the utensil and the color changes to muddy red or brownish red.

Answer: A

Explanation:

The amount of atoms of plutonium – 239 that would remain after 48240 years is 5 atoms

n = t / t½

n = 48240 / 24100

n = 2

N = N₀ / 2ⁿ

N = 20 / 2²

N = 20 / 4

N = 5 atoms

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This statement is false.

Secondary structures in proteins, such as alpha helices and beta sheets, are maintained by hydrogen bonding between backbone atoms, not side groups.

The backbone atoms include the carbonyl group (-C=O) and the amide group (-NH-) of the peptide bond, which link the amino acid residues together.

These hydrogen bonds occur between the electronegative oxygen atom of the carbonyl group and the hydrogen atom of the amide group, creating a regular repeating pattern of hydrogen bonding that stabilizes the secondary structure.

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Yes, the form of glycine used by the human body is D-glycine.

Only the R-group of the amino acid glycine, which includes hydrogen, lacks chirality. Many organic compounds have an inherent chirality that gives birth to a variety of isomers. Glycine is the only natural amino acid that is not chiral at the alpha carbon since R is simply a hydrogen. Four stereoisomers of MetO are possible since it has chiral sulphur and chiral carbon.

With other amino acids, the Val side chain does not create hydrogen bonds. An aliphatic amino acid is isoleucine. Its side chain is aliphatic and has the chemical formula (C4H9). Isoleucine does not create a hydrogen bond since it does not include any electronegative atoms. The thiol group is present in the structure of cysteine.

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Answer:

A gradual change in the shape of the continents.

Explanation:

An example is tropical plant fossils are found in the Artic.

An example of geologic evolution is a gradual change in the size of continents.

Geological evolution is the process of gradual change and events in antiquity that include the steps to create the Earth.

At first, there was extreme volcanism, later the planet cooled to create the crust. Also, condensed water vapor formed the oceans and seas.

The geological history of Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy).

Geological evolution studies the shape of the globe, how it formed, and the relationships of the different eras and the matter that changed during them.

Therefore, An example of geologic evolution is a gradual change in the size of continents.

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Answer:

Ok Hold up. I will answer after I think of question

Explanation:

The correct answer is a. [OH−] increases by a factor of 100.

When a base is added to a solution, it reacts with water molecules to form hydroxide ions (OH−) and increases the concentration of hydroxide ions in the solution. The pH of a solution is a measure of its acidity or alkalinity and is defined as the negative logarithm of the hydrogen ion concentration ([H+]). A pH of 7.0 is neutral, while a pH above 7.0 is alkaline or basic.

When enough base is added to a solution to cause the pH to increase from 7.0 to 9.0, the hydrogen ion concentration ([H+]) decreases by a factor of 100 (10 to the power of 2) because the pH scale is logarithmic. This means that the hydroxide ion concentration ([OH−]) increases by a factor of 100 because the product of the hydrogen ion concentration and the hydroxide ion concentration in water is constant at 10 to the power of -14. Therefore, the correct answer is a. [OH−] increases by a factor of 100.

It is important to note that the concentration of hydroxide ions also depends on the initial concentration of the solution and the amount of base added. In this scenario, it is assumed that the initial concentration of the solution is such that the addition of base to raise the pH from 7.0 to 9.0 results in a 100-fold increase in [OH−].

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Answer:

the aqueous solution of Naclis known as brine

The percent composition of Ca in the compound is 42.06%.

The percent composition of Ca in the compound can be calculated using the formula:

% Ca = (mass of Ca/mass of compound) x 100

Given that 17.6 grams of Ca combine completely with 24.2 grams of S to form a compound, we can calculate the mass of the compound as:

mass of compound = mass of Ca + mass of S = 17.6 + 24.2 = 41.8 g

Substituting these values in the formula above, we get:

% Ca = (17.6 / 41.8) x 100 = 42.06%

Therefore, the percent composition of Ca in the compound is 42.06%.

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Answer:

Explanation:

For amount of radiation from a hot body there is Stefan's Boltzman's law which is given below .

E = e σ T⁴

E is amount emitted , e is emissivity , σ is stefan's constant = 5.67 X 10⁻⁸ W / m² . for earth e =.85 approx

E = .85 x 5.67 X 10⁻⁸ x T⁴

604 = .85 x 5.67 X 10⁻⁸ x T⁴

604 = 4.82 x 10⁻⁸ T⁴

T⁴ = 125.31 x 10⁸

T =  3.3457 x 10²

= 334.57K

Temperature in Celsius = 334.57 - 273

= 61.57 Celsius .

The valence electrons are the electrons found in the last energy level, that is, those that are farthest away from the nucleus of the atom. They are very important because these electrons are the ones that allow chemical bonds, either because they are transferred to another atom or they are shared.

The Lewis structure shows the valence electrons represented by dots or crosses. In this example, they are represented by dots.

We see that the atom Al, aluminum, has three dots. Therefore, it has three valence electrons.

The Bohr model gives us more information about the atom, it is a way of representing how the electrons are distributed around the nucleus. We can see in this model all the energy levels.

The energy levels are represented by circles around the nucleus, the dots on the circles represent the electrons. And the farthest circle is the last energy level. The dots on this circle will be the valence electrons.

If we count the dots in the farthest circle we see that there are 6, this means that this element has 6 valence electrons.

So the answer will be:

3 valence electrons in Lewis dot structure

6 valence electrons in the Bohr model

The mass percent of isopropanol in the solution is 42.2%.

To calculate the mass percent of isopropanol, we need to first calculate the total mass of the solution.

Mass of isopropanol = volume of isopropanol * density of isopropanol = 450.0 ml * 0.7860 g/ml = 353.7 g

Mass of water = volume of water * density of water = 617.5 ml * 1.000 g/ml = 617.5 g

Total mass of solution = mass of isopropanol + mass of water = 971.2 g

Mass percent of isopropanol = (mass of isopropanol / total mass of solution) * 100% = (353.7 g / 971.2 g) * 100% = 42.2%

Therefore, the mass percent of isopropanol in the solution is 42.2%.

In summary, we can find the mass percent of isopropanol in a solution by dividing the mass of isopropanol by the total mass of the solution, and then multiplying by 100%. In this problem, we first calculated the mass of isopropanol and water using their respective densities and volumes, then added them together to find the total mass of the solution. Finally, we applied the formula to find the mass percent of isopropanol.

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Answer:

A) 3.115 mol

B) 11.60 g h2

Explanation:

From the equation

2 mol Li gives 1 mol H2

Then 6.23 gives??

6.23 /2 = 3.116 mol H2

B) moles of Li =mass! molar mass

= 80.57/ 6.941 = 11.6 mol Li

Then moles of H2 = 11.6 /2 = 5.8 mol H2

Mass of H2 = mol * molar mass

5.8*2 =11.6 g h2

The moles of hydrogen formed with 6.23 moles of Li have been 3.115 moles. The mass of hydrogen formed with 80.57 grams of Li has been 11.60 grams.

From the balanced chemical equation,

2 moles Li = 1 mole Hydrogen

(a) The given moles of Li = 6.23 mol .

6.23 mol of Li = \(\rm \dfrac{1}{2}\;\times\;6.23\) moles of hydrogen

6.23 mol Li = 3.115 moles of hydrogen.

The moles of hydrogen formed with 6.23 moles of Li have been 3.115 moles.

(b) The moles can be expressed as:

Moles = \(\rm \dfrac{weight}{molecular\;weight}\)

Moles of Li in 80.57 grams:

Moles of Li = \(\rm \dfrac{80.57}{6.941}\)

Moles of Li = 11.60 moles

The amount of Hydrogen formed:

2 moles Li = 1 mole Hydrogen

11.60 mol of Li = \(\rm \dfrac{1}{2}\;\times\;11.60\) moles of hydrogen

11.60 mol Li = 5.803 moles of hydrogen.

Mass =  moles × molecular mass

Mass of 5.803 moles of Hydrogen = 5.803 × 2

Mass of hydrogen = 11.60 grams

The mass of hydrogen formed with 80.57 grams of Li has been 11.60 grams.

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Answer:

The ideal gas law relates the pressure, volume, temperature, and number of moles of a gas using the equation:

PV = nRT

where P is the pressure of the gas in atmospheres (atm), V is the volume of the gas in liters (L), n is the number of moles of the gas, R is the gas constant (0.08206 L atm/mol K), and T is the temperature of the gas in Kelvin (K).

To use the ideal gas law, you need to know at least three of the four variables in the equation and then solve for the fourth variable. Here are the steps to follow:

Identify the variables that are given and the one that needs to be solved for.

Rearrange the ideal gas law equation to solve for the unknown variable. For example, if you need to solve for pressure, the equation becomes P = nRT/V.

Substitute the known values into the rearranged equation and solve for the unknown variable. Be sure to convert the temperature to Kelvin if it is given in Celsius by adding 273.15.

Make sure to include units in your final answer.

For example, let's say you have a gas with a volume of 2.5 L, a temperature of 298 K, and 0.5 moles of the gas, and you need to find the pressure of the gas. Using the ideal gas law:

PV = nRT

P = nRT/V

P = (0.5 mol)(0.08206 L atm/mol K)(298 K) / 2.5 L

P = 6.11 atm

So the pressure of the gas is 6.11 atm.

Ether acetate would be a suitable solution for the experiment based on the solubility of sodium borohydride and the mysterious aldehydes/ketones.

It is necessary to decrease unidentified aldehydes/ketones with sodium borohydride while submerging the reactants and products.

An unnamed ketone or aldehyde is reduced using sodium borohydride. The resulting alcohol (RCH2OH/R2CHOH), sodium borate (NaBO2), and hydrogen gas are produced when the unknown aldehyde or ketone (RCHO/R2CO) reacts with sodium borohydride (NaBH4). (H2).

Ethyl acetate would be a better solvent overall for the experiment because it would make the reactants and products more soluble.

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Genetic diversity is produced by sexual reproduction, which gives a population a variety of appearances. The following paragraph contains the necessary information regarding genetic diversity.

It is possible for organisms to adapt to changing environmental conditions and prevent inbreeding by maintaining significant genetic variety. When there are limited, isolated populations, inbreeding takes place, which might make a species less able to endure and procreate.

Genetic diversity is the range of different hereditary traits within a species. There would be several people with a wide range of diverse traits in such a species with significant genetic diversity. For a community to adapt to shifting surroundings, genetic variety is essential.

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Answer:

Pros: No vehicle emissions other than water vapor. Fuel economy equivalent to about twice that of gasoline vehicles. Hydrogen is abundant, and can be made from renewable energy. Cons: This space-age technology is expensive.

Answer:

The pros of hydrogen fuel cells are that they are very efficient, producing very little waste. They are also very stable, which makes them safe to use.

The cons of hydrogen fuel cells are that they can be expensive to produce and maintain, and they require a lot of energy to power them, meaning that they often aren't as efficient as they could be.

Despite these pros and cons, hydrogen fuel cells are still a very promising technology. With more research, attention, and development, they could be a powerful force in the fight against carbon emissions and global warming.

The balanced chemical reaction of potassium chloride involves 2 moles of potassium to react with 1 mole of chlorine and other are explained below.

Balanced chemical equations are those equations in which all entities are present in same amount on reactant as well as on the product side of the reaction.

Given chemical reactions are:

        2K + Cl₂ → 2KCl

        CF₄ + 2Br₂ → CBr₄ + 2F₂

        GaF₃ + 3Cs → 3CsF + Ga

        MgF₂ + Li₂CO₃ → MgCO₃ + 2LiF

Hence in the formation of potassium chloride balanced equation involves 2 moles of potassium to react with 1 mole of chlorine.

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Answer:

there are about 26.67 milligrams in 10 mL.

Explanation:

To find the number of milligrams in 10 mL, you can use the proportion:

(8 mg) / (3 mL) = (x mg) / (10 mL)

Where x is the number of milligrams in 10 mL. To solve for x, you can cross-multiply and divide:

(8 mg) * (10 mL) = (3 mL) * (x mg)

x = (8 mg) * (10 mL) / (3 mL)

x = 26.666.. mg

The following is the order of metallic character from least metallic character to most metallic character:-

Beryllium → Magnesium → Calcium → Strontium → Barium

Metallic character refers to the level of reactivity of a metal. Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies.

Within a compound, metal atoms have relatively low attraction for electrons, as indicated by their low electronegativities.

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When both the weak acid solution and the naoh solution are diluted the curve will have less of a slope towards the end. What this means is that the titration is not as reactive and as diluted as much. The dilution will cause the concentration of the solutions to be more spread out and there will be a lot less of a reaction between the two. Another 10 times of dilution will make the slope even less reactive and will cause the reaction with naoh to be much less active than before.

Answer:

rock strata farthest from the ground surface are the oldest

THERE U GO

The reaction that will shift to the right in response to a decrease in volume is:

2HI (g) ⇄ H₂ (g) + I₂ (g)

When the volume of the system is decreased, the pressure increases. According to Le Chatelier's principle, the system will shift in the direction that reduces the number of moles of gas to counteract the increase in pressure.

In this reaction, there are two moles of gas on the left side (2HI) and only one mole of gas each on the right side (H₂ and I₂). Therefore, by decreasing the volume and increasing the pressure, the reaction will shift to the right, favoring the formation of more H₂ and I₂ and reducing the number of moles of gas and equilibrium.

The reaction that will shift to the right in response to a decrease in volume is:

2HI (g) ⇄ H₂ (g) + I₂ (g)

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Answer:

a)

Explanation:

6HCl + 2Al ---> 2AlCl3 + 3H2

6 mol                 2 mol

As we can see 6 mol HCl produce 2 mol AlCl3.

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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(A) R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.

(b) The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery.

(a) To calculate R_L (L, r), we differentiate the equation with respect to L while keeping r constant:

\(R_L(L, r) = d/dL (kL/r^4) = k/r^4\)

R_L represents the rate of change of resistance with respect to the length of the artery, L. The units of R_L are mmHg/cm. A positive value for R_L indicates that an increase in the length of the artery will result in an increase in resistance, meaning it becomes harder for blood to flow through the longer artery.

To calculate R_r (L, r), we differentiate the equation with respect to r while keeping L constant:

\(R_r(L, r) = d/dr (kL/r^4) = -4kL/r^5\)

R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.

(b) To calculate R_rr (L, r), we differentiate R_r (L, r) with respect to r while keeping L constant:

\(R_rr(L, r) = d/dr (-4kL/r^5) = 20kL/r^6\)

R_rr represents the rate of change of R_r with respect to r. The units of R_rr are mmHg/mm^2. A positive value for R_rr indicates that as the radius of the artery increases, the rate of decrease in resistance increases. In other words, the wider the artery becomes, the easier it is for blood to flow through.

To calculate R_rL (L, r), we differentiate R_r (L, r) with respect to L while keeping r constant:

\(R_rL(L, r) = d/dL (-4kL/r^5) = 0\)

R_rL represents the rate of change of R_r with respect to L. The units of R_rL are mmHg/(cm·mm). The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery. This implies that changes in the length of the artery do not affect the rate of change of resistance with respect to the radius.

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The ratio of the volume and temperature of the gas in the given table is as follows:

Charles's law, also known as the law of volumes, describes the relationship between the volume and temperature of a gas at a constant pressure. According to this law, the volume of a gas is directly proportional to its absolute temperature (measured in Kelvin) when the pressure is constant.

In other words, as the temperature of a gas increases, its volume will also increase proportionally, and vice versa. Mathematically, Charles's law can be expressed as:

V/T = k

where V is the volume of the gas, T is its temperature in Kelvin, and k is a constant of proportionality.

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