uranium in the isotope below had 140 nutrons​

Barrier that must be overcome before products are formed in a spontaneous reaction is Activation energy barrier.

A spontaneous response is a response that favors the formation of products on the conditions underneath which the response is occurring. A roaring bonfire is an instance of a spontaneous response, in view that it is exothermic (there is a decrease inside the power of the system as energy is released to the environment as warmth).

Maximum spontaneous chemical reactions are exothermic - they release warmness and heat up their surroundings: for instance: burning wooden, fireworks, and alkali metals introduced to water. When a radioactive atom splits up, it releases strength: that is a spontaneous, exothermic nuclear reaction.

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When answering questions, a question-answering bot on the platform Brainly should always be factually accurate, professional, and friendly. It should be concise and should not provide extraneous amounts of detail. It should not ignore any typos or irrelevant parts of the question.What is a catalyst?A catalyst is a substance that increases the rate of a chemical reaction without undergoing any permanent chemical change itself. This means that the catalyst is neither consumed nor produced in the reaction. In other words, the catalyst does not participate in the reaction itself, but it speeds up the reaction. There are many different types of catalysts, including enzymes, metals, acids, and bases.Which one of the following general characteristics is shared by all catalysts?A catalyst increases the rate of a chemical reaction, but it does not change the key of a reversible reaction. Therefore, the correct answer is c) they increase the reaction rate but do not change the key of a reversible reaction.
All catalysts share the general characteristic (c): they increase the reaction rate but do not change the equilibrium of a reversible reaction. Catalysts work by providing an alternative reaction pathway with a lower activation energy, allowing reactant molecules to convert into products more easily. However, they do not affect the overall energy balance of the reaction or its reversibility.

Li = 1s^2 2s^1

Mg = 1s^2 2s^2 2p^6 3s^2

Br = 2s ^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5

Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause: The system's pressure relief valves.

If a low-pressure refrigeration system is leak tested with nitrogen at a pressure exceeding 10 psig (pounds per square inch gauge), it could cause the system's pressure relief valves to fail.

Pressure relief valves are safety devices installed in refrigeration systems to protect against excessive pressure buildup. They are designed to open and release excess pressure when the system reaches a certain threshold to prevent damage or failure of the system.

When leak testing with nitrogen, it is crucial to ensure that the pressure does not exceed the recommended limits specified by the manufacturer or industry standards.

Exceeding the pressure limits can lead to the overloading of pressure relief valves, causing them to open prematurely or malfunction. This can compromise the safety of the system and potentially result in equipment damage or even personal injury.

It is important to follow proper procedures and guidelines for leak testing refrigeration systems to maintain their integrity and safety.

This includes adhering to recommended pressure limits and utilizing appropriate equipment and techniques to detect and repair any leaks.

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Answer:

Fire is a chemical reaction between oxygen and the fuel. If you want to put out a fire, just get rid of one of those three things – fuel, oxygen or heat. ...It also prevents oxygen from reaching the fuel. Most fire extinguishers work by separating the fuel from the oxygen.

Explanation:

Answer:

It is a chemical change

Explanation:

Liters of Oxygen = 11.5 liters of Oxygen gas produced from 45.3g of MnO3.

Oxygen gas (O2) is a colorless, odorless, tasteless gas that is essential for life on Earth. It makes up about 21% of the air we breathe and is the most abundant element in the Earth's atmosphere. Oxygen gas is highly reactive and participates in many chemical reactions, including combustion and respiration. In combustion, oxygen gas combines with other elements such as carbon, hydrogen, and other compounds to form oxides and release energy as heat. In respiration, oxygen gas is used by cells to produce energy.

Manganese trioxide (MnO3) is an inorganic compound composed of manganese and oxygen atoms. When MnO3 is heated, it will produce oxygen gas. The amount of oxygen gas produced from 45.3g of MnO3 can be calculated using the following equation:

Moles of Oxygen = 45.3g/Molecular Weight of MnO3

Molecular Weight of MnO3 = 87.9g/mol

Moles of Oxygen = 0.517 mol

Liters of Oxygen = 0.517 mol x 22.4 L/mol

Liters of Oxygen = 11.5 liters of Oxygen gas produced from 45.3g of MnO3.

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Assuming the container initially contains an ideal gas at 518.0 kpa at 298.15 k, the aluminium aerosol can will rupture when the internal pressure reaches 210.0 psi, whereas it will burst at 822.50 K.

Pressure is the force applied per unit area over the force perpendicular to an object's surface (symbol: p or P). The pressure as it relates to the air pressure around it is referred to as the gauge pressure. There are several different units used to express pressure. The behaviour of multiple  ideal gas under varied conditions is accurately approximated by the ideal gas law in thermodynamics. The Charle's Law, Boyle's Law, and T2 = (298.15*14.29)/5.18sT2 = 822.50K empirical laws are all combined in the Ideal Gas Equation.

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Answer:

cactus

Explanation:

Its a plant so it makes it own food

The prophets of the period the Restoration old testament survey are Hagai, Zechariah, and Malachi.

The restoration period in the Old Testament is a period of time when the Israelites returned to their homeland after being exiled by the Babylonians.

It was a time when they re-established their faith, their community, and their relationship with God.

The period began in 538 BC when Cyrus the Great of Persia issued an edict allowing the Jews to return to their homeland and rebuild their temple.

The prophets of the period the restoration old testament survey

The three prophets of the Restoration period are Hagai, Zechariah, and Malachi.

Hagai was a prophet who encouraged the people to rebuild the temple in Jerusalem.

Zechariah was a prophet who gave hope to the people by predicting the coming of the Messiah.

Malachi was a prophet who spoke against the corruption of the priests and called the people to repentance.

These prophets played an essential role in the Restoration period, encouraging the people to return to God and rebuild their community.

They were instrumental in keeping the people focused on their faith and in reminding them of God's promises.

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The percentage yield for the reaction between \(Li_3 N_{(s)}\) and \(H_2\), which resulted in the production of \(LiH_{(s)}\), is 25%.

To calculate the per cent yield, we multiply the theoretical yield by 100.

There can be a significant difference in the theoretical and actual yield.

Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s)

\(70 g Li_3N *\frac{ 1 mol Li_3 N}{35 g} = 2 mol Li_3N\\2 mol Li_3N * \frac{2 mol LiH}{1 mol Li_3N} \\4 mol LiH * \frac{7.05 g LiH}{ 1mol LiH} = 28.20\)

Percentage yield = \(\frac{Actual Yield}{Theoretical Yield} * 100\)

\(\frac{8.0g}{28.20 g}\) ≅ 25

From the above calculation, we found that the per cent yield is closest to 25%.

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Your question is incomplete, the probable question is:

Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s) ΔH° = -192 kJ/molrxn Because pure H₂ is a hazardous substance, safer and more cost-effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 °C. When 70 g of \(Li_3N_{(s)}\) (molar mass 35 g/mol) reacts with excess H₂(g), 8.0 g of LiH(s) is produced. The per cent yield is closest to:

Answer:

due to diffusion as hypotonic solution

diffusion is the movements of particles from higher concentration to lower concentration

in hypoxic solutions the concentration is lesser in the inside compared to the outside.

so water enters thus making the potato larger.

hope it helps : )

potato chips ....... making me hungry

The length of the potato chip is increased due to osmosis.

Osmosis is the process in which solvent molecules transport through a semipermeable membrane from a solution of lower concentration to a solution of higher concentration.

The passing of solvent molecules continues from low to high concentration side till the concentration on both sides of the membrane becomes equal.

When the 5.0cm long raw potato chip was placed in water. The water contains less salt and more water than the potato cells. To balance out this concentration on both sides, the water from outside moves into the potato cells.

The incoming water in the cells of potato chips pushes the cell walls and the cells become bigger. As a result, the length of the whole potato chip gets increases from 5 cm to 5.5cm.

Therefore, when we left the potato chip of 5cm in water for 30 minutes. Its length increased to 5.5cm due to osmosis.

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10.3 g of Al is required to completely react with 30.0 g of MnO₂. The correct answer is option D.

Manganese dioxide reacts with aluminum to produce manganese and aluminum oxide. Here's the balanced chemical equation: 3MnO₂ + 4Al → 3Mn + 2Al₂O₃. Now, let's calculate the mass of Al required to react completely with 30.0 g of MnO₂: From the balanced equation, we can see that 3 moles of MnO₂ react with 4 moles of Al.

The molar mass of MnO₂ is 86.94 g/mol. 30.0 g of MnO₂ is equal to:30.0 g / 86.94 g/mol = 0.3444 mol MnO₂. According to the balanced equation, 0.3444 mol of MnO₂ requires: 4/3 × 0.3444 mol = 0.4592 mol of Al. The molar mass of Al is 26.98 g/mol. 0.4592 mol of Al is equal to: 0.4592 mol × 26.98 g/mol = 12.4 g of Al. Therefore, 12.4 g of Al is required to completely react with 30.0 g of MnO₂. Hence, option D is the correct answer.

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The total mass of the items is 853.8 g, according to the solution.

We are aware that in order to determine the mass of the products and the overall mass of the products produced by the reaction, the stoichiometric principles must be applied.

The answer to the question states that 496. 5 grammes of lead II nitrate react with potassium bromide in a way that the lead II nitrate is totally consumed in the reaction. This indicates that the lead II nitrate is the reaction's limiting reactant.

Number of lead II nitrate moles

= 496. 5 grams /331 g/mol

= 1.5 moles

If 1 mole of  lead II nitrate produces 1 mole of lead II bromide

Mass of lead II bromide produced

= 1.5 moles * 367 g/mol

= 550.5 g

If 2 moles of potassium nitrate are created from 1 mole of lead II nitrate

1.5 moles of lead II nitrate produces

=  1.5 * 2 /1

= 3 moles of  potassium nitrate

Mass of  potassium nitrate

= 3  moles * 101.1

= 303.3 g

Total mass produced

= 550.5 g + 303.3 g

= 853.8 g

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To find the volume of oxygen produced at STP when 8.5g of NaNO3 is heated until no further gas is evolved, we need to use the given equation and stoichiometry of the reaction.The correct answer is (c) 4.48 dm³.

The balanced chemical equation is 2NaNO3 → 2NaNO2 + O2, which means that 2 moles of NaNO3 produce 1 mole of O2.First, we need to find the number of moles of NaNO3 present in 8.5g using its molar mass, which is 85 g/mol:

moles of NaNO3 = 8.5 g / 85 g/mol = 0.1 mol

Since 2 moles of NaNO3 produce 1 mole of O2, 0.1 mol of NaNO3 will produce 0.05 mol of O2.

At STP (standard temperature and pressure), 1 mole of gas occupies 22.4 dm³. Therefore, 0.05 mol of O2 will occupy:

0.05 mol x 22.4 dm³/mo = 1.12 dm³,Therefore, the volume of oxygen produced at STP when 8.5g of NaNO3 is heated until no further gas is evolved is 1.12 dm³.The correct answer is (c) 4.48 dm³.

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Millikan's oil drop apparatus allowed for the determination of the "charge" property of the electron.

Millikan's "oil drop" apparatus allowed for the determination of the charge of the electron, which is a fundamental property of the electron. The apparatus allowed Millikan to measure the rate at which oil drops, suspended in an electric field, fell or rose due to the interaction of the electric field and the charge of the electron. By carefully measuring these motions and analyzing the electric field strength, Millikan was able to determine the charge of a single electron.
Millikan's original test, or a modified version, as shown below, is called the oil drop test. The closed system with transparent side handles holds two cables together, which have a positive or negative effect when electric current is applied. At the start of the test, the atomizer sprays a fine mist of oil droplets over the top of the chamber. Under the force of gravity and air resistance, some oil drops fall through a small hole in the top metal plate.

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Answer: B.     3-bromo-5-ethyl-2-methyloctane

Explanation:

The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.

The IUPAC nomeclature shows the standard,,  approved pattern for naming organic compounds. As a matter of fact it is intended to enable pratitioners to write the name of a compound from structure.

The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.

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The saponification reaction of methyl salicylate with sodium hydroxide (NaOH) to produce sodium salicylate and methyl alcohol (methanol) can be represented by the following chemical equation;

C8H8O3 + NaOH → C7H5NaO3 + CH3OH

Purpose of saponification: The saponification reaction has the following purposes:

It is used in the manufacture of soaps and detergents. It is used in the production of biofuels. Industrial applications in textile and paper industries, as well as in the manufacture of candles, are also common.

The term saponification refers to the process of soap production from fats and oils. Saponification is the hydrolysis of an ester in the presence of a base to produce a carboxylate anion and an alcohol.

A fatty acid's saponification results in the formation of a metallic salt; A soap is made of this kind of salt. When a glyceride is reacted with a base, the reaction may be considered a special case of hydrolysis. It involves treating free fatty acids and/or glycerides with a base.

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Answer:

the valence electrons of atoms in a pure metal can be modeled as a sea of electrons

Answer: Galena

Explanation:

(A). Galena

An unidentified mineral that is softer than calcite, exhibits a metallic luster and cubic cleavage. This mineral most likely is galena.

Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, Corundum, and Diamond are just a few examples. - The "Mohs Scale of Mineral Hardness" lists common minerals in order of relative hardness, with talc being the softest and diamond being the hardest mineral. This scale should be familiar to rock hounds and earth science students alike.

When newly broken, galena is a metallic lead grey with a brilliant metallic shine; as it ages, it turns dark grey or black. It is incredibly hefty and fragile (about 7.6 times as heavy as water). Galena often crystallizes in cubic crystals and cleaves into flawless cubic pieces.

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Answer:

volume

Explanation:

Answer:

608 L

Explanation:

Using Boyle's law equation as follows:

P1V1 = P2V2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

According to the information provided in this question;

P1 = 1.00atm

P2 = 2.8atm

V1 = ?

V2 = 217L

Using P1V1 = P2V2

V1 = P2V2/P1

V1 = 2.8 × 217/1

V1 = 607.6/1

V1 = 607.6

The initial volume is 608 L

Answer:

C. 101.2 L

Explanation:

N2 + H2= NH3

Balancing it,

N2 + 3 H2 = 2.NH3

(1 mol) (3 mol) (2 mol)

which means

1 molecule of nitrogen reacts with 3 molecule of hydrogen to form ammonia.

Likewise,

50.6 l of nitrogen reacts with 50.6 × 3= 151.8 l of hydrogrn to form 50.6 × 2= 101.2 l of ammonia.

The statement you provided is correct. In a mixture of gases, each gas exerts its own partial pressure independently of other gases present.

This is known as Dalton's Law of Partial Pressures. Additionally, in a closed system, pressure and volume have an inverse relationship, as described by Boyle's Law.

In a mixture of gases, each gas exerts its own partial pressure: This is known as Dalton's law of partial pressures. According to this law, in a mixture of gases, the total pressure is the sum of the partial pressures of each individual gas in the mixture.

In a closed system, pressure and volume have an inverse relationship: This is known as Boyle's law. According to this law, when the temperature of a gas is held constant, the pressure and volume of the gas are inversely proportional.

The amount of gas that will dissolve in a fluid is determined by the solubility of the gas in the given fluid: This is known as Henry's law. According to this law, the amount of gas that dissolves in a liquid at a given temperature is directly proportional to the partial pressure of the gas above the liquid.  

Lastly, the amount of gas that dissolves in a fluid depends on the solubility of the gas in that particular fluid.

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The process through which cells multiply and divide, known as the cell cycle, has a number of beneficial effects on the body. These are the first two:

The cell cycle is crucial for the body's ability to heal damaged tissues and regenerate old or dead cells. For example, as a wound heals, cells in the nearby tissue divide and proliferate to cover the space, restoring the tissue that was destroyed. Similar to how cells proliferate and develop when bones break, bone tissue cells do the same when they are damaged. As a result, the cell cycle supports the health and proper operation of the body's tissues and organs.Growth and Development: The cell cycle is essential to the body's expansion and maturation. The cell cycle regulates how quickly cells divide in the early stages of development to produce new tissues and organs.

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One of the isomers of C4H10O that is an alcohol is the 1-butanol or butyl alcohol:

Another of the alcohols that has the given formula is tert-butanol or tert-butyl alcohol:

The third isomer of C4H10O is 2-butanol:

And the last isomer is isobutanol or isobutyl alcohol:

The equilibrium concentration of H_{3}O^{+} in a 0.20 M solution of a weak acid depends on the acid's dissociation constant (Ka) and its initial concentration. Without knowing the specific acid, its Ka value, and any other relevant information, it is not possible to provide an accurate numerical value for the equilibrium concentration of H_{3}O^{+}.

In a solution of a weak acid, the acid partially dissociates into H_{3}O^{+} and its conjugate base. The equilibrium concentration of H_{3}O^{+} (represented by [H_{3}O^{+}]) can be determined using an equilibrium expression, which is typically given by the acid's dissociation constant (Ka). The Ka expression is written as [H_{3}O^{+}][A-]/[HA], where [A-] represents the concentration of the conjugate base and [HA] represents the concentration of the undissociated acid.

To calculate the equilibrium concentration of \(H_{3}O^{+}\) you would need to know the initial concentration of the weak acid ([HA]) and the value of Ka. By solving the equilibrium expression with these values, you can determine the equilibrium concentration of H_{3}O^{+}. Keep in mind that the equilibrium concentration may vary depending on the specific weak acid and its Ka value.

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To calculate the molality of the HSO4 solution, we first need to find the number of moles of H2SO4 present in the solution. We can do this by using the formula:
Number of moles = Mass / Molar mass

The molar mass of H2SO4 is 98 g/mol (2 x 1.01 g/mol + 32.06 g/mol + 4 x 16.00 g/mol). Therefore, the number of moles of H2SO4 present in the solution is:
Number of moles = 50 g / 98 g/mol = 0.51 mol
Next, we need to find the mass of the solvent (water) present in the solution. This is given as 450 g.

Now, we can use the formula for molality:
Molality = Number of moles of solute / Mass of solvent in kg
To convert the mass of water from grams to kilograms, we divide by 1000:
Mass of solvent in kg = 450 g / 1000 = 0.45 kg

Therefore, the molality of the HSO4 solution is:
Molality = 0.51 mol / 0.45 kg = 1.13 mol/kg
In summary, the solution has a molality of 1.13 mol/kg.

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Amino acids and proteins are similar to the nucleotides and nucleic acids. Just as proteins are made up of numbers of amino acids, similarly nucleic acids, which include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are made from monomers known as nucleotides.

Although they mainly do different functions in the cell, they do have a lot in common.

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