Explain why the combustion of biomass releases no net carbon into the atmosphere

The emission and absorption spectra of atoms provide as proof for these energy levels. By heating a sample of an element, an emission spectrum can be produced.

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Answer:

counting the number of “groups” of electrons around the atom

Explanation:

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Explanation:

just trying...hope that helps

Answer: Molar masses 40.8 and 100.1

Explanation:

Answer:

attached is the answer, hope it helps!!

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

-3, 34, 34, 9

Explanation:

charge = number of electrons - number of protons

mass number = number of protons + number of neutrons

number of protons = number of electrons

atomic number = number of protons

When benzene is nitrated with a mixture of nitric and sulfuric acids, the electrophile that attacks the benzene ring is a nitronium ion, which has the chemical formula NO2+. This electrophile is generated in situ from the reaction between nitric acid and sulfuric acid, as shown below:

HNO3 + H2SO4 → NO2+ + HSO4- + H2O

The nitronium ion has a formal positive charge on the nitrogen atom (+1) and a formal negative charge on one of the oxygen atoms (-1), giving it an overall formal charge of 0. The three atoms that make up the nitronium ion are nitrogen (N), oxygen (O), and oxygen (O), arranged in a linear configuration. The nitrogen atom is the electrophilic center, as it is the site of positive charge and the atom that attacks the benzene ring in the nitration reaction.

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Answer:

✓ Reactants

✓Reactants

✓ product

Explanation:

The substance(s) to the left of the arrow in a chemical equation are called ..................

A ............... is a substance that is present at the start of a chemical reaction.

A ................. is a substance that is present at the end of a chemical reaction.

Reactants are substances that undergo chemical reaction and are present at the beginning of the reaction and are consumed during the process of the reaction to form a product.

2H2 + O2 ------>2H2O

Here H2 and O2 are Reactants while water H2O is the product ( water)

Products are species that are produced after the chemical reaction have taken place.

Water molecules are attached to hydrated ktof-3 through a process called hydration.

This process involves the formation of hydrogen bonds between the water molecules and the ktof-3 molecules. The hydrogen bonds are formed when the positive hydrogen atoms of the water molecules are attracted to the negative oxygen atoms of the ktof-3 molecules. As a result, the water molecules are attached to the ktof-3 molecules, forming a hydrated compound.

Here is a step-by-step explanation of how this process works:

1. Water molecules are composed of two hydrogen atoms and one oxygen atom. The hydrogen atoms have a positive charge, while the oxygen atom has a negative charge.

2. Ktof-3 molecules are composed of potassium, oxygen, and fluorine atoms. The oxygen atoms have a negative charge, while the potassium and fluorine atoms have a positive charge.

3. When water molecules come into contact with ktof-3 molecules, the positive hydrogen atoms of the water molecules are attracted to the negative oxygen atoms of the ktof-3 molecules.

4. As a result, hydrogen bonds are formed between the water molecules and the ktof-3 molecules. These bonds are what attach the water molecules to the ktof-3 molecules.

5. The end result is a hydrated compound, in which the water molecules are attached to the ktof-3 molecules through hydrogen bonds.

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Answer: The vapor pressure of pure water at 100°C is 760mm of Hg.

Explanation: We know tat 100 degree Celsius the water will convert into gas phase.  At boiling point the vapor pressure of any liquid is 1 atmosphere and if we boil the water at 100° Celsius  it means 1 atmosphere . So, 1 atmosphere = 760mm of Hg.

Answer: 31! hope this helps!

Explanation:

Answer:

Explanation:

Nitrogen N2 has a non polar covalent bond.

Water  H2O has polar covalent bonds between the H and O atoms.

A mole of one element contains Same number of atoms as a mole of another element.

The atomic mass of an element, that is found on the periodic table, may be used to determine the amount of moles in a system. Typically, this mass represents the average of the element's abundant forms found on earth. The mass of an element is given as the average of all of its earthly isotopes. The molar mass of a material is the weight of a mole of that substance. In chemistry, the molar mass is frequently used in converting grams of a chemical to moles. The periodic table lists an element's molar mass, which is its atomic weight in grams per mole (g/mol).

The average mass of an element's atoms expressed in atomic mass units is known as its atomic mass (amu, also known as daltons, D). The weight of the each isotope is combined by its abundance to get the atomic mass, which is a weighted average of all the isotopes of that element.

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The new temperature (t2) required to increase the number of vacancies by 10 times from t1 is approximately 1609.1 Kelvin.

To increase the number of vacancies by 10 times from the starting temperature (t1) of 800°C, we need to calculate the new temperature (t2) required to achieve this.

Step 1: Convert the starting temperature (t1) from Celsius to Kelvin.
To convert from Celsius to Kelvin, we add 273 to the Celsius temperature. So, t1 in Kelvin = 800 + 273 = 1073 K.

Step 2: Use the formula for the relationship between the number of vacancies and temperature.
The number of vacancies (Nv) is given by the equation Nv = N0 * exp(-Q/RT), where N0 is the initial number of vacancies, Q is the activation energy (4.0 eV/atom), R is the gas constant (8.314 J/(mol*K)), and T is the temperature in Kelvin.

Step 3: Calculate the ratio of the final number of vacancies (Nv2) to the initial number of vacancies (Nv1).
Since we want to increase the number of vacancies by 10 times, the ratio Nv2/Nv1 = 10.

Step 4: Substitute the values into the equation and solve for the new temperature (t2).
10 = exp(-Q/(R*t2)) / exp(-Q/(R*t1))

Simplifying the equation, we have:
10 = exp((Q/R)*(1/t1 - 1/t2))

Taking the natural logarithm of both sides of the equation, we get:
ln(10) = (Q/R)*(1/t1 - 1/t2)

Rearranging the equation to solve for t2, we have:
t2 = 1 / ((1/t1) - (R/Q) * ln(10))

Substituting the values, t2 = 1 / ((1/1073) - (8.314/4.0) * ln(10))

Calculating t2 using a calculator, we find that t2 ≈ 1609.1 K.



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The [OH-] of the 0.025 M weak acid solution will be equal to the pKA of the acid, 4.615.
What is weak acid solution?
A weak acid solution is a solution that contains an acid that is not completely ionized in water. Weak acids, such as acetic acid, have pH values between 4.5 and 6.0. These acids are not strong enough to completely break apart in water, leaving some of the molecules still intact. Because of this, weak acids form molecules that can react with other molecules, such as bases, in solution.
This is because the equilibrium of the acid dissociation reaction is reached with the same concentration of acid and its conjugate base in solution. The [H3O] will be equal to 0.025 M, as the acid is in dissociation equilibrium with its conjugate base. The pH of the solution can be calculated by taking the negative log of the [H3O], which will be 1.59. The pOH can be calculated by taking the negative log of the [OH-], which will be 4.615.
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Answer:

Systems thinking allows us to understand all the parts that make up the whole system.

Explanation:

Just took the test

The systems thinking important because, Systems thinking allows us to understand all the parts that make up the whole system. Therefore, option C is correct.

By considering the world's complexity in terms of links and entire rather than breaking it down into its component components, systems thinking helps us make sense of how complicated the world is. It has been applied as a method for investigating and producing efficient action in challenging situations.

By using a deeper grasp of the surrounding structure and its constituent parts rather than relying just on previous events, systems thinking gives a technique to more accurately forecast future outcomes.

Systems thinking is a discipline in management that focuses on understanding a system by looking at the connections and interactions between the different parts that make up the entire of that defined system. The concept of the "entire system" is a way of looking at an entire organization in relation to its surroundings.

Thus, option C is correct.

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Answer:

B- gravity

Explanation:

Gravity is a force in which everything in the universe is trying to pull everyother thing towards themsef. Here, the sun's gravity keeps the planet in orbit.

I hope im  right! !!

Island Y i think? I hope i'm right

madagascar is the oldest island.

Answer: 10 grams

Explanation: Original sample is 80 gram and every three days half of its composition decays so 80 down to 40 in the first 3 days, 20 in the next three days, and  10 in the last three days

Answer:

A stalagmite is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites are typically composed of calcium carbonate, but may consist of lava, mud, peat, pitch, sand, sinter and amberat.

and a stalactite means mineral formation that hangs from the ceiling of caves, hot springs, or man-made structures such as bridges and mines. Any material that is soluble and that can be deposited as a colloid, or is in suspension, or is capable of being melted, may form a stalactite.

Pieces of copper, silver and gold are dropped into a solution of iron sulphate. The piece that will get a coating of copper is. ... Therefore, none of the three metals can displace iron from its salt solution. Hence, we observe that no reaction takes place and none of the pieces get coated.

Answer:

If it were a piece of iron dropped into a copper sulfate solution, precipitated copper would coat the iron

Answer:

covalent

Explanation:

(i) The initial-boundary value problem for the given scenarios are as follows:

a) Scenario a:

PDE: ∂u/∂t = k * ∂²u/∂x²

Initial condition: u(x, 0) = 100 (boiling water temperature)

Boundary conditions: u(0, t) = 10, u(L, t) = 10 (constant temperature at the ends)

b) Scenario b:

PDE: ∂u/∂t = k * ∂²u/∂x²

Initial condition: u(x, 0) = 100 (boiling water temperature)

Boundary conditions: u(0, t) = 0 (temperature at x=0), ∂u/∂x(L, t) = 0 (thermal insulation at x=L)

(iii) The solution for the temperature distribution as time approaches infinity can be found by solving the appropriate steady state equation.

(i) The initial-boundary value problem formulation states the partial differential equation (PDE) governing the temperature distribution in the aluminum bar, along with the initial condition and boundary conditions.

In scenario (a), both ends of the bar are immersed in a medium with a constant temperature of 10 degrees Celsius, while in scenario (b), the end at x=0 is immersed in a medium with temperature 0 degrees Celsius and the end at x=L is insulated.

(ii) As time approaches infinity, the temperature distribution in the bar tends to reach a steady state.

In scenario (a), the temperature throughout the bar will eventually approach a constant value of 10 degrees Celsius, since both ends are immersed in a medium with that temperature.

In scenario (b), the temperature at x=0 will approach 0 degrees Celsius, while the temperature at x=L will remain constant due to thermal insulation.

(iii) To find the solution as time approaches infinity, we need to solve the appropriate steady state equation.

In scenario (a), the steady state equation is ∂²u/∂x² = 0, which implies that the temperature gradient is zero throughout the bar, resulting in a constant temperature of 10 degrees Celsius.

In scenario (b), the steady state equation is ∂²u/∂x² = 0 with the boundary condition u(0) = 0, which implies a linear temperature distribution from 0 degrees Celsius at x=0 to a constant temperature at x=L due to insulation.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Calculate electrons

Total electrons=10+2=12

The element is Magnesium with symbol Mg as atomic no is 12

Additional:-

M:-

Excited state of magnesium