Select the correct mass for each of the samples described below.

8.32 × 10^20 formula units CaBr2

The number 6 that he put in from of the  \(O_{2}\) , \(CO_{2}\) , and \(H_{2} O\) is called a coefficient .

So , second option is correct one .

In chemistry, coefficient is a number used in chemical equations, simply as a prefix of chemical formula to define the number of molecules reacting and creating in a reaction. This is similar to how in mathematics, coefficient is the number used in front of a variable.

When dealing with concentration terms in a chemical equation, coefficients are crucial to the equation's stability. In order to ensure that the law of conservation of mass is being obeyed, we add coefficients to the equation to make it balanced.

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Answer:

Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health.

Explanation:

Sulfur dioxide (SO2) emissions, primarily the result of burning coal, contribute to acid rain and the formation of harmful particulate matter.

And thx!

Answer:

2Mg + O₂ ​ → 2MgO

Explanation:

In a nuclear fission reaction, a freely moving neutron is introduced to a nuclear fuel, then a neutron is absorbed by an atom's nucleus.

Nuclear fission is a process in which an unstable nuclei will convert into stable nuclei after releasing the energy in the form of particles.

When we introduce a freely moving neutron to the nuclear fuel of uranium-235 nuclei then this introduced neutron was absorbed by the nuclei and makes the nuclei more unstable. Then this unstable nuclei will convert into two nuclei in the addition of three neutrons.

Hence, a neutron is absorbed by an atom's nucleus.

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Answer:

Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.

Answer:

it produces amino acids and proteins. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.

For this question, since we are given the pressure, number of moles and temperature to find the volume, we have to use the ideal gas equation.

pV = nRT

Now lets put in the values

V = (0.263 mol x 8.314 J/mol x 307 k)/1.15 atm

V = 583.722 L

.

According to the solubility graph of KNO₃, 0.160 moles  would have to be added to 100 g of water to form a saturated solution at 10°C.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.

At 40°C 67 g potassium nitrate is soluble thus at 10°C 10×67/40= 16.25 g is soluble which is 16.25/101.10= 0.160 moles.

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The minimum amount of oxygen required for the complete combustion of 20cm³ of CO and 20cm³ of H₂ would be 20.16 cm³ at STP.

The balanced chemical equation for the combustion of CO and H2 is:

CO + 1/2O2 → CO2

H2 + 1/2O2 → H2O

From the equation, we can see that one mole of CO requires 1/2 mole of O2, while one mole of H2 requires 1/2 mole of O2.

From the balanced equation, we can see that each mole of CO requires 1/2 mole of O2, while each mole of H2 requires 1/2 mole of O2.

Therefore, we need 0.00083/2 = 0.00042 moles of O2 for the combustion of CO and the same amount for the combustion of H2.

The total amount of O2 required is the sum of the amounts needed for each reactant:

Therefore, the minimum amount of oxygen required for the complete combustion of 20 cm³ of CO and 20 cm³ of H2 is approximately 20.16 cm³ at STP.

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Sand and water can be separated by any of the following methods:

1. Sedimentation and decantation: This method involves the mixture being kept undisturbed for some time. After some time, sand being heavier and insoluble in water, settles down at the bottom of container. Now, water is poured into another container to separate it from sand.

2. Filtration: This method involves the mixture being passed through a filter paper (a filter with very fine pores). Sand particles being larger in size are retained by the filter paper and get separated from water.

I hope this helps! :D

Answer:

The effect of fertilization on atmospheric carbon dioxide emissions depends on the type of fertilization and the specific context in which it is used. In some cases, fertilization can lead to a positive feedback loop that increases carbon dioxide emissions, while in other cases, it can have a negative feedback loop that reduces emissions.

When fertilizers are applied to agricultural crops, they can increase the productivity and yield of the plants, leading to increased carbon dioxide uptake through photosynthesis. This can have a negative feedback loop, as more carbon is sequestered from the atmosphere and stored in the soil and plant biomass.

However, excessive use of fertilizers can lead to a positive feedback loop. The excess nutrients can cause algal blooms in bodies of water, which can lead to oxygen depletion and the release of carbon dioxide and other greenhouse gases. Moreover, over-fertilization can lead to the degradation of soil health, which can reduce the carbon sequestration potential of soils.

Overall, the impact of fertilization on carbon dioxide emissions depends on various factors such as the type and amount of fertilizer used, the management practices, and the ecological context in which they are applied. It is important to use fertilization practices that support sustainable and regenerative agriculture, minimize greenhouse gas emissions, and promote soil health.

The osmotic pressure of a 100 mM sucrose solution at 25°C is 2.448 atm.

Osmotic pressure refers to the pressure exerted by a solution across a semipermeable membrane due to the movement of solvent molecules from an area of lower solute concentration to an area of higher solute concentration. To calculate the osmotic pressure of a 100 mM sucrose solution at 25°C, we will use the following formula:

Osmotic Pressure (π) = nRT/V

where:
n = moles of solute
R = gas constant (0.0821 L atm/mol K)
T = temperature in Kelvin (K)
V = volume of solution in liters

First, we need to convert the temperature to Kelvin:

T = 25°C + 273.15 = 298.15 K

Next, we need to determine the moles of solute (sucrose) in the solution:

Since the solution is 100 mM (millimolar), this means there are 100 millimoles (mmol) of sucrose per liter of solution. Assuming we have a 1-liter solution:

n = 100 mmol/L * 1 L = 100 mmol
n = 100 * 10^(-3) mol = 0.1 mol (converted from millimoles to moles)

Now, we can plug the values into the formula:

π = (0.1 mol)(0.0821 L atm/mol K)(298.15 K) / 1 L
π = 2.448 atm

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Answer:putis

Explanation:

ai domti now

Answer:

makes sugar water

Explanation:

because the sugar dissolves into the water

Answer:

it will be a sugar water

Explanation:

When sugar is mixed into water, it dissolves and forms a homogeneous mixture with the water. The sugar molecules are surrounded by the water molecules and spread out evenly throughout the water, resulting in a solution with altered physical properties.

Answer:

Joules

Explanation:

I think it's D

Hope that helps

Answer: B, the bonding in the compound is nonpolar covalent.

Explanation:

This is because with the same electronegativity, there is an equal sharing of electrons, which indicates that the bonding must be nonpolar.

There are approximately 13.11 moles of calcium in 525 g of Ca.

What is Molar Mass?

It is a physical property of a substance that is calculated by adding up the atomic masses (in atomic mass units, or amu) of all the atoms or molecules that make up the substance.

Molar mass is an important concept in chemistry because it allows us to convert between the mass of a substance and the number of moles of that substance, which is necessary for many chemical calculations.

Step 1: The molar mass of calcium (Ca) is 40.08 g/mol.

Step 2: To calculate the number of moles of calcium in 525 g of Ca:

mol = 525 g / 40.08 g/mol

mol = 13.11 mol (rounded to two decimal places)

Therefore, there are approximately 13.11 moles of calcium in 525 g of Ca.

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Explanation:

A is the answers for the question

The product formed in the combustion reaction is generally the oxidized fuel. The combustion reactions are exothermic. The products of the given reaction are CO₂ and H₂O. The correct option is D.

A  chemical reaction in which the fuel undergoes oxidation by reacting with a powerful oxidizing agent which results in the release of energy generally in the form of heat is defined as the combustion. All combustion reaction will not results in fires.

The combustion of LPG fuel which is used for cooking food involves the combustion reaction between the oxygen present in the atmosphere and the liquified petroleum gas. The explosion of fire works also indicates the combustion reaction.

The given reaction is given as:

CH₂(g) + O₂(g) → CO₂(g) + H₂O(g)

The substances on the right-hand side are called the products.

Thus the correct option is D.

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Answer:

As a rough rule, five pounds of dry ice will turn from a solid to a gas in 24 hours. It's best to pick up the block of ice just a few hours before your party so it's as frozen as possible when the bash starts.

Explanation:

The electron found in the last energy level of an atom is called a valence electron.

The valence electrons are the outermost electrons of an atom that participate in chemical bonding and interactions with other atoms.

The number of valence electrons in an atom determines its chemical properties, including its reactivity and ability to form bonds.

These electrons are crucial in determining the element's behavior in chemical reactions and the formation of compounds.

As an example, elements in the same group of the periodic table have the same number of valence electrons, leading to similar chemical properties.

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Option A, ridge formation where cold matter in the mantle is sinking, could be included in an accurate model of thermal convection in Earth's interior.
Thermal convection refers to the transfer of heat energy through the movement of fluids due to temperature differences. In the case of Earth's interior, the heat generated by the core is transferred to the surface through the movement of molten rock in the mantle. This movement is driven by differences in temperature and density of the molten rock.

Option A, ridge formation where cold matter in the mantle is sinking, is a key aspect of this process. At mid-ocean ridges, new oceanic crust is formed as magma rises up from the mantle and solidifies. As this new crust cools, it becomes denser and sinks back down into the mantle, pulling the surrounding cooler rock with it. This sinking motion creates a convection current that helps to transfer heat from the core to the surface.
Option B, seafloor spreading where convection currents meet, is also related to thermal convection in Earth's interior. However, this process occurs at the boundaries between tectonic plates, where the movement of molten rock drives the spreading of the seafloor. While this process is related to thermal convection, it is not a direct part of the movement of molten rock in the mantle.
Option C, subduction where tectonic plates are moving apart from one another, is not related to thermal convection in Earth's interior. Instead, subduction occurs when one tectonic plate is forced beneath another, which is driven by the movement of molten rock in the mantle.
Option D, earthquakes where hotter matter is sinking beneath colder matter, is also not directly related to thermal convection. While earthquakes can occur as a result of the movement of molten rock in the mantle, they do not contribute to the overall transfer of heat from the core to the surface.

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9. Using the combined gas law, the volume of the gas at STP can be calculated as 112.2 L. This equation takes into account the initial pressure, temperature, and volume, as well as the new pressure and temperature at STP.

10. Applying Boyle's law, the new volume of the air inside the submarine would be approximately 87,873.2 L. This is calculated by multiplying the initial volume and pressure, and dividing by the new pressure.

11. Using the combined gas law, the new volume of the balloon can be calculated as 0.98 L. This equation takes into account the initial temperature, volume, and pressure, as well as the new temperature.

12. Using Boyle's law, the new pressure of the gas can be calculated as 3.25 atm. This equation takes into account the initial pressure and volume, as well as the new volume.

13. Using Charles' law, the new volume of the person's lungs can be calculated as 3.8 L. This equation takes into account the initial lung capacity and temperature, as well as the new temperature.

It is highly unlikely that a person would actually explode from anger, as the body has mechanisms in place to regulate pressure and prevent such an event.

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To calculate the equilibrium composition, temperature, and pressure of the combustion products after deflagration, several factors must be considered, including the reactants' initial composition and the thermodynamic properties of the products.

This can be done using chemical equilibrium software such as the NASA Glenn Chemical Equilibrium with Applications (CEA) program.

The CEA program calculates the equilibrium composition, temperature, and pressure of the combustion products by solving for the thermodynamic equilibrium conditions of the reactants and products. The program uses the Gibbs free energy minimization method to determine the equilibrium state.

The equilibrium composition of the combustion products will depend on the reactants' initial composition, which can include fuels, oxidizers, and any other reactants present. The temperature and pressure of the combustion products will also be influenced by the reactants' initial conditions and the combustion process itself.

Overall, the calculation of the equilibrium composition, temperature, and pressure of combustion products after deflagration is a complex process that requires a thorough understanding of the thermodynamic properties of the reactants and products.

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Answer:

Work done=50J

Heat removed=29J

Now

\(\\ \sf\longmapsto \Delta E=-50+29\)

\(\\ \sf\longmapsto \Delta E=-21J\)

Hence the internal energy would decrease by 21J

The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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The one that represents the reduced forms of the two major electron carriers for the respiration is :  NADH and FADH2 . The glycolysis takes place in the cytoplasm.

The electron carrier is reduced to the NADH and which is then changed to the NAD+. The electron carrier will becomes oxidized as the result of this the reaction first half. The Lactic acid will be produced during the process from the pyruvate.

Reduced electron the carriers by the FADH2 and NADH to carry the electrons into the complexes I and II, respectively, in the electron transport chain. Glycolysis will occurs in the cytoplasm/Matrix Cytosol. The citric acid cycle and the fatty acid oxidation reactions will take place in matrix of the mitochondria.

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Answer: .04544 or 4.544 x 10^-2

Explanation: Simply divide 923.0 by 20312. Use 4 significant figures because it is the least amount of significant figures present in your calculation.

The answer for the given equation in significant figures is 0.045.

The number of digits in a value, often a standard measure, that make a contribution to the precision of the value is referred to as significant figures. The first non-zero digit is used to begin counting significant figures.

All zeros to the right and left of a decimal point are never significant. For example, the number 0.00798 had three significant digits.

In the given equation, let us assume the number is X.

X = 923.0/20312

X = 0.0454.

Thus, the answer is 0.045.

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