Bismuth oxide reacts with carbon to form bismuth metal:
Bi₂O₃(s) + 3C(s) → 2Bi(s) + 3CO(g)
When 283 g of Bi₂O₃ reacts with excess carbon, how many
(b) moles of Bi form?

The type of decay that Am-241 undergoes to become Np-237 is alpha decay. The correct option is a.

Alpha decay is a type of decay or transformation in which a nucleus emits an alpha particle and change into different atomic nuclei. The atomic number reduces by 2 and the mass is reduced by 4.

Am-241 is an isotope of the chemical element americium. It is a radioactive element and its radioactive decay period is 432.2 years. It is used in the testing of machinery.

When the nucleus of Am changes or emits a radioactive particle. It converts into Np-237. The process is called alpha decay. The atomic mass is reduced by four, and the 241 converts into 237, which become neptunium.

Thus, the correct option is a. Alpha decay.

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Answer:

January 9th 1915

Explanation:

density = mass/volume

volume= mass/density

Yes, you're correct.

Answer:

Volume isn't equal to mass.

Explanation: Mass is weight, volume is like how much something can hold.

Answer: The ocean is made mostly of: D) Hydrogen and oxygen.

Explanation: The most abundant elements in the ocean by proportion of mass in percent are oxygen (85.84%), hydrogen (10.82%), chlorine (1.94%), sodium (1.08%), magnesium (0.13%), sulfur (0.09%), calcium (0.04%), potassium (0.04%), bromine (0.007%), carbon (0.003%), and boron (0.0004%).

Hope this helped!

Answer:

Explanation:

After the Becquerel came to know the discovery of X-ray by Roentgen  Becquerel began looking for a connection between the phosphorescence  and the newly discovered X-rays. His thought was that phosphorescent uranium salts might absorb sunlight and reemit it as x rays.

To experiment this  he exposed a sample of uranium to sunlight, and then was pleased to discover that the uranium continued to emit energy even after it was taken out of the light. However, after several straight days of cloudy skies over his laboratory, Becquerel was shocked to discover that the energy kept coming from the uranium,  

He reported that the uranium salts emitted radiation without any stimulation from sunlight.  He did further tests to confirm that sunlight was indeed unnecessary, that the uranium salts emitted the radiation on their own.

Initially he thought the effect was due to particularly long-lasting phosphorescence, but he soon discovered that non-phosphorescent uranium compounds exhibited the same effect. After that he announced that the element uranium was indeed what was emitting the radiation.  

At first he also believed his rays were similar to x-rays, but his further experiments showed that unlike x-rays, which are neutral, his rays could be deflected by electric or magnetic fields which was against his expectations. Finally “Radioactivity” term was given to describe this new phenomenon.

This story of becquerel is well known example of accidental discovery.

Answer:

C

Explanation:

this is because the rest talk about the findings of protons,neutrons and electrons.

Explanation:

They have to battle them dang hogs and get them burrows before them.

Answer:

1). Scientific

2). Plating the diluted bacteria on media that supports the growth of only living micro organisms. Statistically accurate.

To solve this problem, we need to determine the amount of oleum produced when 9.33 kg of SO3 reacts with a certain amount of 91.34% H2SO4 to produce 4.71% oleum.

Let's first calculate the mass of H2SO4 present in the initial solution. Since the solution is 91.34% H2SO4, we have:

Mass of H2SO4 = 91.34% * 9.33 kg = 8.51 kg

Next, we can calculate the mass of oleum produced. Since the oleum concentration is 4.71%, we have:

Mass of Oleum = 4.71% * 9.33 kg = 0.439 kg

Therefore, approximately 0.439 kg of oleum was produced.

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The practical radioactive system used to date lava flows involves the gas argon-40, which decays to the gas potassium-40. Option A is correct.

This is known as the potassium-argon dating method, which is commonly used to date volcanic rocks and minerals. Potassium-40 decays into argon-40 with a half-life of 1.25 billion years, and the ratio of argon-40 to potassium-40 can be used to determine the age of the sample.

A radioactive system refers to a group of radioactive atoms that decay over time according to a specific decay scheme. The decay of radioactive isotopes occurs at a constant rate, known as the half-life, which is the time it takes for half of the original atoms to decay.

Radioactive systems are used in various applications, including dating geological materials, medical imaging, and nuclear energy production. Different radioactive isotopes have different half-lives and decay schemes, which determine their usefulness for different applications.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"One practical radioactive system used to date lava flows involves: group of answer choices A) the gas argon-40, which decays to the gas potassium-40. B) the gas argon-40, which decays to solid potassium-40. C) the solid potassium-40, which decays to solid argon-40. D) the solid potassium-40, which decays to the gas argon-40. E) the solid potassium-40, which decays to the solid moosemossium-41."--

Answer

crush the cubes of broth, add warm water and stir the container.

Explanation

The FASTEST way to make the chicken broth with the cubes you have will be to increase the surface area of the cubes broth by crushing and raise the temperature of the cubes broth by adding warm water and by stirring the container.

Hence, the correct answer to your question is:

crush the cubes of broth, add warm water and stir the container.

Answer:

5

Explanation:

There are 77.27 grams of KOH present in the solution.

To determine the amount of grams of base present in a solution of 2.3L of KOH with normality 0.6N, we first need to understand the relationship between normality, volume, and the molecular weight of the compound.

Normality (N) is defined as the number of equivalents of solute per liter of solution. In this case, we know that the normality of KOH is 0.6N.

The molecular weight of KOH is 56.11 g/mol. This means that one mole of KOH weighs 56.11 grams.

To calculate the amount of base present in the solution, we can use the formula:

grams of base = normality x volume x molecular weight

Substituting the values given in the question, we get:

grams of base = 0.6N x 2.3L x 56.11 g/mol

Simplifying the expression, we get:

grams of base = 77.27 g

Therefore, there are 77.27 grams of KOH present in the solution.

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The volume of DMSO needed to make a 20 mm stock solution of sulfadiazine, when weighing out 4.7 mg of this compound, is approximately (1.88 x 10^-5 mol) / 20 mm * (1 mL/1.1 g) = 0.085 mL.

To calculate the volume of DMSO needed to make a 20 mm stock solution of sulfadiazine, we can use the equation:

C1V1 = C2V2

Given:
Molecular weight of sulfadiazine = 250 g/mol
Weight of sulfadiazine = 4.7 mg

First, we need to convert the weight of sulfadiazine from milligrams to grams:
4.7 mg = 0.0047 g

Next, let's calculate the number of moles of sulfadiazine:
moles = mass / molecular weight
moles = 0.0047 g / 250 g/mol = 1.88 x 10^-5 mol

Now, let's plug the values into the equation:
C1V1 = C2V2
20 mm = (1.88 x 10^-5 mol) / V2

To solve for V2 (volume of DMSO), we rearrange the equation:
V2 = (1.88 x 10^-5 mol) / 20 mm

Now, let's convert the volume to milliliters by using the density of DMSO:
1 mL of DMSO = 1.1 g

V2 = (1.88 x 10^-5 mol) / 20 mm * (1 mL/1.1 g)

Therefore, the volume of DMSO needed to make a 20 mm stock solution of sulfadiazine, when weighing out 4.7 mg of this compound, is approximately (1.88 x 10^-5 mol) / 20 mm * (1 mL/1.1 g) = 0.085 mL.

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The reaction between ethyl bromide and sodium cyanide in acetone is most likely an SN2 reaction that is characterized by a strong nucleophile and polar aprotic acetone.

The SN2 mechanism is the reaction that is generally seen in organic compounds and is characterized by the breaking and forming of chemical bonds synchronously. It is based on nucleophilic substitution.

The reaction between ethyl bromide and sodium cyanide is SN2 as it has a strong nucleophile and acetone act as a polar solvent. Ethyl bromide is an alkyl halide that has leaving group for the substrate.

Therefore, it is an SN2 reaction mechanism.

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Answer:

14 Calcium (4x3+2)

2 Phosphurus (2)

9 Oxygen (4x2+1)

Sublimation and melting are exothermic phase transitions. Exothermic describes a process or reaction that releases energy in the form of heat.

Here correct answers is A and C

During sublimation, a solid goes directly to a gas state without passing through the liquid state. During melting, a solid turns into a liquid as energy is released in the form of heat.

Conversely, endothermic processes absorb energy in the form of heat. Examples of endothermic phase transitions include freezing, deposition, condensation, and evaporation. During freezing, a liquid turns into a solid as energy is absorbed in the form of heat.

During deposition, a gas turns into a solid as energy is absorbed in the form of heat. During condensation, a gas turns into a liquid as energy is absorbed in the form of heat. During evaporation, a liquid turns into a gas as energy is absorbed in the form of heat.

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The optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can have serious consequences on physiological processes. The body employs three mechanisms to control pH: buffers, respiratory regulation, and renal regulation. Blood plays a crucial role in maintaining pH homeostasis by utilizing these mechanisms.

The optimum pH range for blood is tightly regulated between 7.35 and 7.45. If the blood pH deviates from this range, it can disrupt normal physiological processes. For example, if the blood becomes too acidic (pH below 7.35), a condition called acidosis occurs.

Acidosis can lead to impaired enzyme function, decreased oxygen delivery to tissues, and disruption of the central nervous system. On the other hand, if the blood becomes too alkaline (pH above 7.45), a condition called alkalosis occurs. Alkalosis can result in muscle twitching, confusion, and even seizures.

To maintain the pH within the optimal range, the body employs three primary mechanisms: buffers, respiratory regulation, and renal regulation. Buffers are chemical substances that can accept or donate hydrogen ions to resist changes in pH. They can bind excess hydrogen ions when blood becomes acidic or release hydrogen ions when blood becomes alkaline.

The respiratory system regulates pH by adjusting the levels of carbon dioxide (\(CO_{2}\)) in the blood through changes in breathing rate and depth. By altering the amount of \(CO_{2}\), the body can regulate the concentration of carbonic acid (\(H_{2}\)\(CO_{3}\)) and thus control pH. The kidneys play a crucial role in long-term pH regulation by selectively reabsorbing or excreting bicarbonate ions (\(HCO_{3}\)-) and hydrogen ions (H+) in the urine.

Hence, the optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can lead to acidosis or alkalosis, disrupting physiological processes. The body controls pH through buffers, respiratory regulation, and renal regulation. Buffers resist pH changes, the respiratory system regulates \(CO_{2}\) levels to control carbonic acid concentration, and the kidneys selectively reabsorb or excrete bicarbonate and hydrogen ions to maintain pH homeostasis.

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Answer:

Fossil fuels, such as coal, oil, or natural gas, release carbon back into the atmosphere.

The processes would be decomposition, diffusion, erosion, respiration, and combustion.

Explanation:

Hope this helped?

The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

Answer:

C

Explanation:

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

2.79 mol NH3 have 2.79 mol of N atoms. Answer is 1.68*10²⁴ N-atoms

The relationship between the calculated/theoretical number of ions/particles in solution and the actual number of particles in solution depends on several factors, such as the accuracy and precision of the analytical method used to determine the number of particles.

In reality, the actual number of ions or particles in a solution can vary from the calculated number due to a number of factors. For example, ions can interact with each other and form complexes, or they can be adsorbed onto the surface of solids or other surfaces in the solution. Additionally, ions can be lost from solution due to precipitation, and they can be present in the solution in different forms (such as free ions, ion pairs, or hydrated ions).

Therefore, while the calculated number of ions or particles in solution provides a useful starting point for understanding the behavior of a solution, it is important to keep in mind that the actual number of ions or particles in solution can differ from the calculated number, and that other factors can influence the behavior of the solution.

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Answer:

Star is a cycles two

Sana maka tolong

The reaction that does not occur in a beaker is;

- CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) + 213 kcal

In a beaker, it is unlikely that all of these conditions will be met for a combustion reaction to occur. For example, there may not be enough fuel present in the beaker to sustain a combustion reaction, or there may not be enough oxygen to support the reaction.

Additionally, an ignition source such as a spark or flame is usually necessary to initiate the reaction, which is unlikely to be present in a beaker.

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Answer:

Radiant energy to chemical energy

Explanation:

Got it right on edge 2021

One energy transformation that is taking place in the photosynthesis process is radiant energy to chemical energy.

Energy transformation is the process in which one form of energy converted into another form of energy.

Photosynthesis process is defined as the process in which plants makes their own food by using the carbon dioxide, water and sunlight in the chlorophyll.

The balanced chemical equation of photosynthesis process is

6CO2 + 6H2O → C6H12O6 + 6O2.

Since, it have 6 atoms of carbon, 12 atoms of hydrogen and 18 atoms of oxygen on both side. So, it is balanced.

Since, sunlight which it take is in the form of radiant and convert it into chemical energy.

Thus, we concluded that the energy transformation that is taking place in the photosynthesis process is radiant energy to chemical energy.

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In this nuclear reaction equation, oxygen decays to form Nitrogen. The equation which correctly describes this decay is 15/8 O → 15/7 N + 0/1 e.

Nuclear reaction or Nuclear reaction, in Nuclear Physics, is any reaction in which one or more atomic nuclei are modified, where two or more atoms unite or an atom undergoes nuclear fission. Such a reaction should not be confused with a chemical reaction, it occurs with the peripheral electrons of the atom.

Thus, the equation which correctly describes this decay is 15/8 O → 15/7 N + 0/1 e.

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Answer:

15/8O --> 15/7N + 0/1e

Explanation:

edg

Answer:

Acetic acid , systematically named ethanoic acid , is a colourless liquid organic compound with the chemical formula CH3COOH.

Explanation: