removes nitrogen from the atmosphere. removes nitrogen from the atmosphere. denitrification nitrification mineralization nitrogen fixation

Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.

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Answer:

C

Explanation:

C) an atom with an atomic number of 18

Answer:

we need to see the diagram

Explanation:

The concentration of the KOH solution is 0.100 M. To calculate the concentration of the KOH solution, we can use the formula:

Molarity (M) = (moles of solute) / (volume of solution in liters)

Given:

Mass of KHP (potassium hydrogen phthalate) = 3.458 g

Molar mass of KHP = 204.22 g/mol

Volume of KOH solution = 45.71 mL = 0.04571 L

First, we need to calculate the moles of KHP:

moles of KHP = (mass of KHP) / (molar mass of KHP)

moles of KHP = 3.458 g / 204.22 g/mol ≈ 0.01693 mol

Next, we can calculate the concentration of the KOH solution:

Molarity of KOH solution = (moles of KOH) / (volume of solution)

Molarity of KOH solution = 0.01693 mol / 0.04571 L ≈ 0.370 M

Converting the concentration to scientific notation, we have:

Molarity of KOH solution ≈ 3.70 x 10^-1 M

Therefore, the concentration of the KOH solution is approximately 0.100 M.

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Hope it helps ~

Answer:

1. FALSE

2. FALSE

3. TRUE

4. FALSE

5. TRUE

6. TRUE

7. FALSE

8. FALSE

9. FALSE

10. FALSE

Answer:

359

i think

Explanation:

The formed cyclopropane has cis stereochemistry.

Chiral cyclopropane rings are important pharmacophores in pharmaceutical drugs and bioactive natural products, so libraries of these building blocks are an important resource for drug research and development campaigns.

A synthesis is a set of two or even more reactions that are designed to produce a specific end product. A synthetic step is a single reaction that has to be carried out independently of the other reactions in a synthesis.

The number of steps inside a synthetic sequence equals the number of reactions that need to be performed separately, i.e. the number of reactions that comprise the sequence.

By stereospecific addi-tion of singlet carbenes, cis cyclopropane could be synthesized from cis alkene. Using a Lindlar catalyst, cis alkene could be synthesized from alkynes.

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Answer:

Number of moles (n)=

molecular weight

weight

Weight=n×Molecular weight

=0.5×14

Mass=7g

The no. of moles of \(CH_4\) remaining after the reaction is found to be 11.5 moles.

The no. of moles of a material equals the ratio of its given mass to the mass of one mole of that molecule in a chemical reaction.

The coefficients reflect the number of moles, not simply molecules, that react.

Stoichiometric coefficients are the numbers that come before the chemical formula of a molecule participating in a reaction. They assist us in determining the relative amounts or no. of moles of each reactant consumed and product created during a reaction.

\(CH_4 (g) + 2O_2 (g) \rightarrow CO_2 (g) + 2H_2O (g)\)

No. of moles of \(CH_4\) = 13.0 mol

No. of moles of \(O_2\) = 3.0 mol

Here \(O_2\) is limiting reagent because moles of \(O_2\) is less.

Thus, \(CH_4\) is in excess

1 mol \(CH_4\) = 2 mol \(O_2\)

x mol \(CH_4\) = 3 mol \(O_2\)

Moles of \(CH_4\) used = 3 x 1 / 2 = 1.5 mol

Here we have 13 moles of \(CH_4\),

Therefore,

No. of moles of \(CH_4\) left = 13 - 1.5 = 11.5

Result:

11.5 moles of \(CH_4\) will remain after the reaction.

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Outgoing shortwave radiation depends on factors such as the angle of the Sun's rays, albedo, cloud cover, and atmospheric gases. These factors collectively determine the amount of solar radiation that is reflected, absorbed, and re-emitted by the Earth's surface, influencing the outgoing shortwave radiation.

Outgoing shortwave radiation depends on several factors. Firstly, it is influenced by the solar radiation received by the Earth's surface. The amount of solar radiation reaching the Earth is determined by the angle of the Sun's rays, which changes throughout the day and across different seasons. This means that outgoing shortwave radiation will vary depending on the time of day and the time of year.

Another important factor is the albedo, which refers to the reflectivity of different surfaces on Earth. Surfaces with high albedo, such as ice and snow, reflect more solar radiation back into space, resulting in lower outgoing shortwave radiation. Conversely, surfaces with low albedo, such as dark soil and vegetation, absorb more solar radiation, leading to higher outgoing shortwave radiation.

The presence of clouds also plays a role in outgoing shortwave radiation. Clouds can either reflect incoming solar radiation back into space or absorb and re-emit it as longwave radiation. The type and thickness of clouds, as well as their altitude, can affect the amount of outgoing shortwave radiation.

Finally, atmospheric gases such as water vapor, carbon dioxide, and ozone can also influence outgoing shortwave radiation. These gases absorb and re-emit some of the incoming solar radiation, impacting the amount of radiation that escapes back into space.

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The molality of chloride ions is 4.63kg/L

Data;

Mole Fraction of MgCl2 = 0.04

The sum of mole fraction = 1

Mole fraction of water = 1 - 0.04 = 0.96

since the total number of moles = 1

Number of moles of MgCl2 = mole fraction * total number of moles

Number of moles of MgCl2

\(0.04 * 1 = 0.04 moles\)

Number of moles of water =

\(0.96 * 1 = 0.96 moles\)

1 moles of MgCl2 = 2 moles of Chloride ions

Number of moles of chloride ions

\(2 * 0.04 = 0.08 moles\)

Number of moles of water = 0.96moles

mass of water = molecular weight * number of moles

mass of water =

\(18 * 0.96 = 17.28g\)

let's convert this to kilogram

\(1000g = 1kg\\17.28g = x\\x = 0.01728kg\\\)

The molality of the ions in the solution is

\(M = \frac{mass of solute}{volume of solution} \\M = \frac{0.08}{0.01728} =4.63 kg/L\)

The molality of chloride ions is 4.63kg/L

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The correct chemical formula for barium nitride is: b. Ba3N2

The chemical formula for barium nitride can be determined by balancing the charges of the ions involved. Barium ions carry a 2+ charge, while nitrogen ions carry a 3- charge.

To balance the charges, we need two barium ions (2 × 2+ = 4+) for every three nitrogen ions (3 × 3- = 9-). The positive and negative charges must cancel each other out in the compound.

Therefore, the correct chemical formula for barium nitride is: b. Ba3N2

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The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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The reaction will produce 6.61 mole of magnesium oxide.

What is the purpose of magnesium oxide?

There are several uses for magnesium oxide. Some people use it as an antacid to treat acid indigestion, digestive problems, and heartburn. Magnesium oxide can also be used as a laxative to quickly and temporarily empty the bowels (before surgery, for example).

Briefing:

This clearly demonstrates that 100.95g magnesium nitride reacts with 108.06g of water to give stoichiometric ammonia and magnesium oxide.

moles of Mg3N2 = 3.82g /100.95g per mole =0.0387 mole

mole of OH2 = 7.73g/18.01g per mole

magnesium oxide, i.e. 0.0387 mole × 58.32g per mole= 6.61mole

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The reaction for Carbon-14, used in carbon dating, decays by beta emission and in Uranium-238 decays by alpha emission.

Alpha radiation releases when the nucleus of an atom becomes unstable and alpha particles are released in order to restore stability. Alpha decay occurs in elements have high atomic numbers, such asuranium, radium, and thorium etc. The reaction that describes an alpha emission because radiations are 5740 years. Now, Carbon-14 has a half life of 5730 yrs, and it used to date fossils of 50 hundred yrs old. It undergo beta emission. In case of Uranium- 238, has half life of 236 yrs. Because there is so much difference between half lives of both so we can't use both of together in one reaction. So, it goes on alph emission. The reactions are

¹⁴₆C → ¹⁴₇N - e⁻

Hence, required reaction is alpha emmision.

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The correct IUPAC name for H2S (with the 2 written as a subscript) is hydrogen sulfide.

Easy ,

Answer:

The periodic table

Explanation:

As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.

When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.

example. Find the molar mass of

H₂SO₄

Hydrogen (2) + sulphur (1) +oxygen (4)

= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)

=1(2) + 32(1)+16(4)

=2+32+64

=98

N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript

A cyclic diallylamine called 1-ethyl-3-methylcyclohexane is a feedstock used to create methicillin-resistant Staphylococcus aureus (MRSA).

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Answer:

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Answer:

1.25 mL/s

Explanation:

Your are told that 25.0 mL of H2 was produced 20 seconds. This is equal to rate 25/20 = 1.25 mL/s

When a reaction progresses, the reactant concentration gradually decreases and the product concentration gradually increases. Here the rate of the reaction is 1.25 mL/s.

The rate of a chemical reaction is defined as the rate of decrease of concentration of a reactant or the rate of increase of concentration of a product. The rate of the reaction is usually expressed in units mol L⁻¹s⁻¹. The rate of the reaction are affected by several factors like concentration of the reactants, temperature, etc.

An equation which expresses the experimentally observed rate of a reaction in terms of the molar concentration of the reactants which determine the rate of the reaction is called rate equation.

Here it is seen that 25.0 mL of H2 was produced 20 seconds. So the rate is given as:

Rate = 25/20 = 1.25 mL/s

Thus the rate of the reaction is 1.25 mL/s.

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Answer:

peroxide such as hydrogen peroxide In peroxide, oxygen has an oxidation number of -1. when oxygen is combined with fluorine it's oxydation number is +2

When baking soda (NaHCo3) reacts with water it produces a new substance such as carbonic acid which shows it is a chemical reaction because something new is produced. This reaction releases heat energy so we can say that it is an exothermic reaction.

Mixing baking soda and vinegar with each other will produce a new substance such as carbondioxide gas is produced which also show that it is a chemical reaction so we can conclude that both reaction represents chemical reaction.

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The option that does not demonstrate a property of heat is that it is a physical substance (option A).

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.

Heat can also refer to the thermal energy transferred between two systems at different temperatures that come in contact.

Heat is a form of energy and not a physical substance. Therefore, the first option is the correct answer.

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According to the electronic configuration, vanadium can lend three electrons.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

HOPE IT HELPS...

Explanation:

When added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering its freezing point below the ices temperature. Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt, and so on