At room temperature, what would be the ratio of hydrogen atoms in the first excited state to the number in the ground state?

Explanation:

these are the formula that u need to know

1. moles= concentrate × volume

2. moles = mass / mr

3. moles = volume in dm3 / 24dm^3

4. moles = Pressure in pa × Volume in m3 / 8.031 × temperature in K

hope this helps :)

Frameshift Mutation changes the Amino Acid sequence as it impact on the folding of the protein.

The sequence of a protein is determined by the DNA of the gene that encodes the protein. A change in the gene's DNA sequence may lead to a change in the amino acid sequence of the protein. Some mutations do not result in changes in the amino acid sequence of the encoded protein and can be described as silent mutations. Other mutations result in abnormal protein products. Mutations can introduce new alleles into a population of organisms and increase the population's genetic variation. Some mutations that change DNA bases do not have any effect on the sequence of amino acids in the protein. These mutations are called silent mutations and they do not affect the structure or function of the protein because there is no effect on the amino acid sequence. Frameshift mutation have a significant impact on the folding of the protein as they  changes the sequence of the amino acid.

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Answer:

1 mole=6.023×10^23 molecules

3.04×10^23 molecules× value of 1 mole

Explanation:

need thanks and make me brainiest if it helps you

According to the concept of Avogadro's number, there are 0.504 moles in 3.04×10²³ molecules of hydrogen.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole has 6.023×10²³ molecules , thus, 3.04×10²³ molecules of hydrogen will have  3.04×10²³ /6.023×10²³=0.504 moles.

Thus, there are 0.504 moles in 3.04×10²³ molecules of hydrogen.

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Answer:

Number 2:

Element and compound

The acid in the given reaction is HBr (Option B). In a chemical reaction, acid is a substance that donates or gives away hydrogen ions (H+) while the base is a substance that accepts hydrogen ions.

When the base accepts the hydrogen ion, it becomes positively charged.What is the reaction given?Consider this reaction :KOH + HBr ➝ KBr + H₂OKOH is a base while HBr is an acid. When KOH and HBr react, they form KBr and H₂O (water). HBr loses a hydrogen ion to KOH which accepts it. Thus HBr donates a proton (H+) to KOH which accepts the proton. Therefore, HBr acts as an acid while KOH acts as a base. So, the correct answer is option B, HBr.Further HBr stands for hydrogen bromide, which is a highly acidic compound. It gives off H+ ions when dissolved in water and donates H+ ions to a base to produce water.

The given reaction is an example of a neutralization reaction, as a base KOH (potassium hydroxide) reacts with an acid, HBr (hydrogen bromide), to produce a salt, KBr (potassium bromide), and water.

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Answer:

chemical energy

Explanation:

A battery stores energy in the form of chemical energy. Chemical energy is stored in the bond of atoms and molecules. These bonds break and convert to other forms of energy. In the given case, the chemical energy is converted to electric energy which powers the flashlight. Thus, flashlight receives energy input in the form of chemical energy.

Answer:

hard

Explanation:

Answer:

German chemistry

Explanation:

the chemical of the soil is very important it depends what will grow and how well

Answer:

heterogeneous          

In order to give birds a varied and balanced diet, commercial bird seed blends typically include a range of seeds, grains, and other substances. As a result, bird seed is frequently categorised as a heterogeneous blend.

A seed is referred to as homogenous if its genetic makeup, size, shape, and other traits are all consistent. To guarantee consistency in the ensuing plants, these seeds are typically created through controlled breeding or genetic manipulation. A heterogeneous seed, on the other hand, is one that varies in genetic makeup, size, shape, and attributes. These seeds frequently result from cross-pollination or natural pollination between various species or kinds.

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Answer:

B

Explanation:

The properties of a substance can be measured when matter undergoes a change.

The one that describes the properties of a substance is how it reacts with other chemicals, How it looks, and  How it behaves.​ The correct option is A. All of these.

The property of a substance is its unique quality and physical and chemical appearance. The properties of a substance are of two types: chemical and physical.

Physical properties talk about how a substance looks its color, its texture, and its solidness or softness. Some physical properties are density, color, melting, and boiling point.

Chemical properties are those properties that tell about how a substance reacts with other substances. Some chemical properties are reaction with or reaction with air.

Thus, the correct option is A. All of these, How it reacts with other chemicals, How it looks, and How it behaves describe the properties of a substance.

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The answer is option 4: one unshared electron and six bonding electrons exist around the central atom in ozone (O3).

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endothermic

requires energy to occure

Answer:

i think

they are used to male the animal grow

Once the animal eats the food, the atoms in food are  used to make the animal grow.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

75%

Explanation:

So, the reaction will consume 1 mole of hydrogen gas and produce

1mole H2⋅2 moles NH33moles H2=0.667 moles NH3

at 100% yield. This represents the reaction's theoretical yield.

Now, you know that the reaction produced 0.50 moles of ammonia. This represents the reaction's actual yield.

In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every 100 moles of ammonia that could theoretically be produced.

You know that 0.667 moles will produce 0.50 moles, so you can say that

100moles NH3.in theory⋅0.50 moles NH3.actual0.667moles NH3.in theory=75 moles NH3.actual

Therefore, you can say that the reaction has a percent yield equal to

% yield = 75%

The molar mass of a compound can be determined using the atomic masses of each element present and the number of their atoms. The molar mass of Ca(NO₃)₂ is 164 g/mol.

The molar mass of a compound is the mass of one mole of that compound. One mole of any compound contains 6.02 × 10²³ atoms. This number is called Avogadro number.

The given compound contains the elements Ca, N and O.

atomic mass of Ca = 40 g/mol

atomic mass of N = 14 g/mol

atomic mass of O = 16 g/mol.

mass of 3 O = 48 g.

then mass of NO₃ = 48 + 14 = 62 g.

The total mass of the compound = 40 g + (62 ×2) = 164 g.

Therefore, the molar mass of the compound Ca(NO₃)₂ is 164 g.

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Answer:

specific colors of light pure neon produces glowing orange or red signs

Explanation:

Explanation:

You might wonder what neon signs like these have to do with fireworks. Neon lights produce their color by having gases in the tubes excited by electrical energy. Once the gas atoms or molecules are excited, they release that energy as very specific colors of light. Pure neon produces glowing orange or red signs.

I hope it's helpful!

Answer:

333(3significants points)

The 1s orbital of hydrogen (H) and carbon (C) do not form a bond because they have different energies. The 1s orbital of hydrogen is lower in energy compared to the 2s and 2p orbitals of carbon.

In chemical bonding, orbitals with similar energies overlap to form bonds.

Carbon has a higher atomic number and more electrons than hydrogen, resulting in a more complex electron configuration. The 2s and 2p orbitals of carbon have higher energies than the 1s orbital.

When carbon bonds with hydrogen, the 2s and 2p orbitals of carbon overlap with the 1s orbital of hydrogen, creating molecular orbitals.

This overlap allows for the formation of stable sigma bonds, resulting in molecules such as methane (CH4) or other organic compounds.

Thus, the difference in energy levels between the 1s orbital of hydrogen and the 2s/2p orbitals of carbon prevents direct bonding between them.

Instead, the 2s and 2p orbitals of carbon interact with the 1s orbital of hydrogen to form stable bonds.

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The mole fraction of NH3 in the solution prepared by dissolving 15.0 g of nh3 in 250.0 g of water is 0.0597.

To find the mole fraction of NH3 in the solution, we need to first calculate the moles of NH3 and water in the solution.

The moles of NH3 can be found by dividing the mass of NH3 by its molar mass:
moles of NH3 = 15.0 g / 17.03 g/mol = 0.881 mol

The moles of water can be found by dividing the mass of water by its molar mass:
moles of water = 250.0 g / 18.02 g/mol = 13.874 mol

The total moles of solute and solvent in the solution are:
total moles = moles of NH3 + moles of water = 0.881 mol + 13.874 mol = 14.755 mol

The mole fraction of NH3 can now be calculated as the ratio of moles of NH3 to total moles:
mole fraction of NH3 = moles of NH3 / total moles = 0.881 mol / 14.755 mol = 0.0597

Therefore, the mole fraction of NH3 in the solution is 0.0597.

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At the end of the reaction before adding aqueous \(NaHCO_3\), the following chemical species are likely to be present:

A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.

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If a solution contains both a strong electrolyte and a nonelectrolyte and is tested with a conductivity apparatus, the observation would be a bright light in the light bulb. Option(b)

A strong electrolyte dissociates completely into ions in solution, leading to the presence of free-moving charged particles that can conduct electricity. This results in a strong electrical current and a bright light in the conductivity apparatus.

On the other hand, a nonelectrolyte does not dissociate into ions and does not contribute to conductivity. However, in the presence of a strong electrolyte, the conductivity is dominated by the electrolyte, leading to a bright light in the bulb. Therefore, the correct answer is (b) bright light.

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First, we write down our reaction:

N2 + 3H2 → 2NH3

Don't forget to balance it.

We only use moles as units.

Procedure:

3 x 1 mole H2 ------------ 2 x 1 mole NH3

3.1 moles H2 ------------- x

x = 2.1 moles NH3 are produced

Answer: 2.1 moles NH3

Answer:

1. Cu = +2

2. O = – 2

3. C = +2

4. N = 0

Explanation:

Note:

A. The oxidation state of oxygen is always – 2 except in peroxides where it is – 1.

B. The oxidation state of Hydrogen is always +1 except in metallic hydrides where it is – 1.

Now let us solve the question given above.

1. CuO = 0 (ground state)

Cu + O = 0

O = – 2

Cu + (– 2) = 0

Cu – 2 = 0

Collect like terms

Cu = 0 + 2

Cu = +2

2. H2O = 0 (ground state)

2H + O = 0

H = +1

2(1) + O = 0

2 + O = 0

Collect like terms

O = 0 – 2

O = – 2

3. CO = 0 (ground state)

C + O = 0

O = – 2

C + (– 2) = 0

C – 2 = 0

Collect like terms

C = 0 + 2

C = +2

4. N2 = 0 (ground state)

2N = 0

Divide both side by 2

N = 0/2

N = 0

solids are similar to liquids in that both are condensed states, with particles that are far closer together than those of a gas. However, while liquids are fluid, solids are not. The particles of most solids are packed tightly together in an orderly arrangement. The motion of individual atoms, ions, or molecules in a solid is restricted to vibrational motion about a fixed point. Solids are almost completely incompressible and are the densest of the three states of matter.

Answer

F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.

Explanation

Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.

The equilibrium concentration of [NO] is 0.246 mol/L.

To find the concentration of NO ([NO]) at equilibrium, we need to use the equilibrium constant (Kc) and the initial concentrations of N2 and O2.

Given that, Initial volume (V) = 1.0 L

Initial moles of N2 = 0.22 mol

Initial moles of O2 = 0.22 mol

Equilibrium constant (Kc) = 0.10

Using the equation: N2 + O2 ⇌ 2NO

Let's denote the change in concentration of NO as 'x'.

Since the stoichiometry of the balanced equation shows that 1 mol of N2 reacts to form 2 mol of NO, the change in concentration of NO is 2x.

The initial concentration of N2 and O2 remains the same since their moles and volume are constant.

At equilibrium, we can express the concentrations as follows:

[N2] = (0.22 mol) / (1.0 L) = 0.22 mol/L

[O2] = (0.22 mol) / (1.0 L) = 0.22 mol/L

[NO] = (2x mol) / (1.0 L) = 2x mol/L

According to the equilibrium constant expression, Kc = [NO]^2 / ([N2] * [O2])

0.10 = (2x)^2 / (0.22 * 0.22)

Solving this equation will provide the value of x, which corresponds to the equilibrium concentration of NO.

After solving the equation, we find that x ≈ 0.123 mol/L.

Therefore, [NO] at equilibrium is approximately 2x = 2 * 0.123 = 0.246 mol/L.

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Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

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The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

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The mass of solution is equivalent to the mass of the solute and solvent.

The material whose dissolves is known as a solute, as well as the substance

The solute is dissolved to produce a solution, is known as a solvent.

Solution is made by solvent , solute also. So, by adding mass of solvent and solute mass of a particular solution could be found.

It can be expressed as:

Mass of solution = mass of solute + mass of solvent

Therefore, the mass of solution is equivalent to the mass of the solute and solvent.

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