Atomic mass is calculated by adding
and

Answer:

5.81×10²² molecules of oxygen.

Explanation:

This a reaction of decomposition:

2KClO₃ →  2KCl + 3O₂

2 moles of potassium chlorate can produce 2 moles of potassium chloride and 3 moles of oxygen.

We determine the amount of salt.

7.89 g. 1mol /122.55g = 0.0644 moles.

If 2 moles of salt, can produce 3 moles of oxygen.

0.0644 moles of salt may produce (0.0644 . 3) /2 = 0.0966 moles.

Let's count the molecules.

1 mol oxygen contains 6.02×10²³ molecules

Then, 0.0966 moles may contain (0.0966 . NA) = 5.81×10²² molecules

Answer:

A gully is a large groove, or channel, in the soil that carries runoff after a rainstorm. Gullies join together to form a larger channel called a stream.

Explanation:

I hope it helps:)

Answer:

This is an example of a physical change because the ice cubes began to melt.

This is an example of a physical change because the ice cubes began to melt.

Explanation:

The above is the right answer to the question about the dissolution of the whole mixture mentioned in the excerpts above.

Answer:

D

Explanation:

Solvent is the material that is dissolving another material​. Thus, option D is correct.

A solvent is a substance that dissolves another substance to form a solution. The substance that is being dissolved is called the solute, and the substance that is doing the dissolving is called the solvent. The solute is usually present in a smaller amount than the solvent, and it is the solvent that determines the physical properties of the solution, such as its density, viscosity, and boiling point.

For example, when salt is dissolved in water, the salt is the solute and the water is the solvent. The water molecules surround the salt molecules and break them apart, so that the salt ions are free to move around in the solution. The solution is then a homogeneous mixture of salt ions and water molecules.

Thus, option D is correct.

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The weak intermolecular force of attraction that allows proteoglycans to interact with extracellular proteins, such as antithrombin (AT), is electrostatic interactions.

Proteoglycans, including heparan sulfate, have sulfated glycosaminoglycan chains that contain negatively charged sulfate groups.

These negatively charged groups can interact with positively charged amino acid residues on extracellular proteins through electrostatic interactions.

Antithrombin (AT) is an example of an extracellular protein that interacts with heparan sulfate through electrostatic attractions.

The electrostatic interactions between the negatively charged sulfate groups of proteoglycans and the positively charged regions of extracellular proteins play a crucial role in various biological processes, including cell adhesion, signaling, and the regulation of protein function.

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Answer:

In a survey of a group of people, it was found that 60 0f them have

business, 45 have government jobs, 125 have farming, 27 have business

only, 15 have government job only, 10 have business and government

job only, 5 have government job and farming only.

i) How many people have all the profession?

ii) How many people were there in a survey?

Answer:

When a solid dissolves the solid (solute) and the liquid (solvent) form a very close intimate mixture called a solution. :)

(Brainliest?)

Explanation:

Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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Answer:

neutralise

Explanation:

There is a special name given to the reaction between an acid and a base to form salt and water and water only. That name is 'neutralization'. Hence to 'neutralize' an acid connotes the idea of 'cancelling' the effect of an acid.

An acid has a number of deleterious effects on surfaces, the most prominent of which is corrosion of the surface due to oxidation. If a surface is accidentally exposed to an acid, the effect of that acid on the surface can be counteracted by the immediate application of a base to 'neutralize' the acid. Neutralization in this sense is akin to 'cancelling' out the acid.

The examples are endless. Another common example is the neutralization of an acidic soil by a base in order to 'cancel' the acidity of the soil and make the soil fertile for plant growth.

Explanation:

2HCl+2Zn----> 2ZnCl+H2

Explanation:

HCL + Zn= zncl2 + H2

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Answer:

You protect yourself and others from numerous injuries. Such safety equipment would be goggles, tongs, gloves(sometimes), hair pulled back, sleeves rolled up, etc.

Explanation:

Answer:

Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects.

To form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.

The compound Al2O3, commonly known as aluminum oxide, is formed when two aluminum atoms and three oxygen atoms bond. To determine the number of total electrons that must be transferred to form one formula unit of Al2O3, we first need to find the number of electrons that are present in one formula unit of Al2O3.

Aluminum has an atomic number of 13, which means it has 13 protons and 13 electrons in a neutral atom. Each aluminum atom in Al2O3 contributes 3 electrons, and since there are two aluminum atoms in one formula unit of Al2O3, the total number of electrons contributed by aluminum atoms is 6.

Oxygen has an atomic number of 8, which means it has 8 protons and 8 electrons in a neutral atom. Each oxygen atom in Al2O3 contributes 2 electrons, and since there are three oxygen atoms in one formula unit of Al2O3, the total number of electrons contributed by oxygen atoms is 6.

Therefore, to form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.

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Answer: D. If the reaction occurs in the gas phase

Explanation:

Answer:

D is correct via A P e x

Explanation:

Answer:

The letters, s, p, d, and f designate the shape of the orbital. (The shape is a consequence of the magnitude of the electron's angular momentum, resulting from its angular motion.) An s orbital is spherical with its centre at the nucleus.

Answer:

trueee is the answer heh need points

When a liquid is heated, the average kinetic energy of its particles will increase.

The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.

Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.

Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.

Average kinetic energy = 3KT/2

If temperature increases, kinetic energy also increases.

Therefore, When a liquid is heated, the average kinetic energy of its particles will increase.

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Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Molar enthalpy is the amount of energy per mole. Enthalpy is a thermodynamic quantity that corresponds to a system's total heat content according to this definition. It is equivalent to the system's internal energy plus the sum of the pressure and volume products. This value's unit of measurement is KJ/mol.

Entropy is assumed to be 1 kB/particle

kB: Boltzmann Constant = 1.3806*10^(23)/JK

Entropy, S = 1.3806*10^(-23) /JK

We are aware that S = Q/T

provided T = 83.85 k

and that Q = S*T = S*83.85k = 1.157*10(-21) J / particle.

Since 1 mole = 6.022x1023 particles of heat energy,

the formula for an is 1.157*10(-21)*6.022*10^23, which is 6.967*102 J/mole.

Argon's molar enthalpy is Q/n,

where n is the number of moles,

and ΔH equals 0.6967 KJ/mole.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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The claim that the atomic model should not be continually changed is based on the principle of scientific stability and coherence. Continually changing the atomic model can undermine the stability of scientific understanding and impede the development of robust theories.

The claim that the atomic model should not be continually changed is based on the principle of scientific stability and coherence. Continually changing the atomic model can undermine the stability of scientific understanding and impede the development of robust theories. The current atomic model, based on quantum mechanics and the understanding of subatomic particles, has provided a consistent framework that has successfully explained and predicted numerous phenomena. This model has undergone rigorous testing, verification, and refinement over the years. While scientific progress and new discoveries are essential, it is important to maintain a balance between incorporating new evidence and maintaining a stable foundation. Frequent changes to the atomic model can lead to confusion and make it difficult to build upon existing knowledge. It is preferable to refine and expand upon the current model as new evidence emerges, rather than discarding it entirely. This approach ensures continuity and progress in scientific understanding while maintaining a coherent framework for further exploration.

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The reading from the three students can best be interpreted as not accurate but precise.

In measurements, accuracy is described as the closeness of a single or average measurement to the true value of what is measured.

On the other hand, the precision of measurements refers to the closeness of repeated measurements to each other.

Now, let us look at the readings from the three students.

The range of the reading can be calculated as:

3.6 - 3.3 = 0.3

Since a range of + or -0.3 is considered to be precise, the readings from the students is said to be precise.

Let us look at the average of the readings:

3.3 + 3.4 + 3.6/3 = 3.4 g

Since the actual weight of the salt is 3.5 g, the reading from the student is said to be inaccurate.

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The pH after the addition of 81 mL of 0.40 M NaOH to 80.0 mL of 0.40 M HClO4 is 13.30

The balanced chemical equation for the reaction between HClO4 and NaOH is:

HClO4 + NaOH → NaClO4 + H2O

First, let's find the moles of HClO4 and NaOH present before the reaction:

moles HClO4 = 0.40 mol/L x 0.080 L = 0.032 mol

moles NaOH = 0.40 mol/L x 0.081 L = 0.0324 mol

Since the moles of NaOH added are greater than the moles of HClO4 initially present, NaOH is the limiting reagent. Therefore, all of the NaOH will react with the HClO4, and we need to find the number of moles of HClO4 that react with the NaOH.

According to the balanced equation, 1 mole of NaOH reacts with 1 mole of HClO4. Therefore, 0.0324 mol of HClO4 will react with the 0.0324 mol of NaOH.

The remaining moles of HClO4 after the reaction is given by:

moles HClO4 remaining = 0.032 mol - 0.0324 mol = -0.0004 mol

Since the resulting moles of HClO4 is negative, this means that all the HClO4 has been used up and the solution is basic. The excess NaOH reacts with water to produce hydroxide ions:

NaOH + H2O → Na+ + OH- + H2O

The total volume of the solution after the reaction is:

V = 80.0 mL + 81 mL = 0.161 L

The concentration of OH- ions produced is given by:

[OH-] = moles NaOH / V = 0.0324 mol / 0.161 L = 0.201 M

Using the expression for the ion product of water, we can calculate the concentration of H+ ions:

Kw = [H+][OH-] = 1.0 x 10^-14

[H+] = Kw / [OH-] = 1.0 x 10^-14 / 0.201 M = 4.975 x 10^-14

The pH of the solution is given by:

pH = -log[H+] = -log(4.975 x 10^-14) = 13.30

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The concentration of the sodium carbonate solution is 0.559 mol/dm³ and the concentration of the sodium carbonate solution is 59.2 g/dm³.

a) The concentration of the sodium carbonate solution in mol/dm³ is 0.559 mol/dm³.

To calculate the concentration of the sodium carbonate solution, we can use the balanced equation and the stoichiometry of the reaction. From the balanced equation, we can see that 2 moles of nitric acid react with 1 mole of sodium carbonate.

First, we need to calculate the number of moles of nitric acid used. Given the volume and concentration of the nitric acid solution:

Moles of HNO₃ = Concentration x Volume = 0.500 mol/dm³ x 27.9 cm³ ÷ 1000 cm³/dm³ = 0.01395 mol

Since 2 moles of nitric acid react with 1 mole of sodium carbonate, the number of moles of sodium carbonate used is also 0.01395 mol.

Now, we can calculate the concentration of the sodium carbonate solution:

Concentration of Na₂CO₃ = Moles of Na₂CO₃ / Volume = 0.01395 mol / 25.0 cm³ ÷ 1000 cm³/dm³ = 0.559 mol/dm³

Therefore, the concentration of the sodium carbonate solution is 0.559 mol/dm³.

b) The concentration of the sodium carbonate solution in g/dm³ is 20.2 g/dm³.

To calculate the concentration in g/dm³, we need to convert the concentration from mol/dm³ to g/dm³ using the molar mass of sodium carbonate.

Molar mass of Na₂CO₃ = 2 x (22.99 g/mol) + 12.01 g/mol + 3 x (16.00 g/mol) = 105.99 g/mol

Concentration in g/dm³ = Concentration in mol/dm³ x Molar mass = 0.559 mol/dm³ x 105.99 g/mol = 59.24 g/dm³

Rounding to three significant figures, the concentration of the sodium carbonate solution in g/dm³ is 59.2 g/dm³.

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The mass of a hydrogen atom changes by 1.14 x 10⁻³⁵ g when it moves from the ground state to the first excited state. Hydrogen atom's transition from the ground state to the first excited state can be explained using the Bohr model of an atom.

Bohr's model is used to describe an atom's structure. Hydrogen atom's transition from the ground state to the first excited state can be explained using the Bohr model of an atom. The transition occurs when the electron absorbs energy from a photon that has a frequency and is in the ultraviolet region.

When an atom is in its ground state, its electron is in the lowest energy level possible. Electrons in atoms can exist at higher energy levels, known as excited states, as a result of absorbing energy. When an electron moves from a lower energy level to a higher energy level, the electron absorbs the energy difference between the two levels. The atom's mass also changes when it moves from the ground state to the first excited state.

According to Einstein's theory of relativity, mass and energy are related. As a result, the mass difference between the two states can be calculated as follows:

In the ground state of hydrogen, the electron's energy is -13.6 eV.

The energy of the electron in the first excited state of hydrogen is -3.4 eV, which is more than the energy of the electron in the ground state by 10.2 eV.

The excitation energy is the amount of energy required to move an electron from the ground state to an excited state. ΔE is the symbol used to represent excitation energy.

ΔE = E₂ - E₁= -3.4 eV - (-13.6 eV) = 10.2 eV

The amount of energy absorbed by the hydrogen atom to transition from the ground state to the first excited state is 10.2 eV.

According to Einstein's theory, E=mc², the mass change can be calculated as follows: Δm = ΔE/c²

                                                                                                                                                      =10.2 eV / (3 x 10⁸ m/s)²

                                                                                                                                                      = 1.14 x 10⁻³² kg

                                                                                                                                                      = 1.14 x 10⁻³⁵ g

Therefore, the mass of a hydrogen atom changes by 1.14 x 10⁻³⁵ g when it moves from the ground state to the first excited state.

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C. Fast growth rate would be the most useful trait for these farmers.

Selective breeding is used to produce a crop with desired characteristics, such as a fast growth rate. A fast growth rate is beneficial to farmers in northern areas with short summer seasons because it allows the wheat to mature quickly and be harvested in a shorter amount of time, thus providing a larger yield despite the shorter growing season.Selective breeding is a process of selecting chemical compounds with specific desired properties and breeding them together to create a new compound with the desired traits. This is done by rearranging the chemical bonds between the two compounds and creating a new molecule with the desired characteristics. This process is known as chemical hybridization.

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complete question:Scientists plan to use selective breeding to produce a new type of wheat for farmers who live in northern areas with short summer seasons. Which of these traits would be MOST useful for these farmers?

a.large seed size

b.long stem length

c.fast growth rate

d.shallow root systems

1) The wavelength of the photon is 6.5 * 10^ -7 m

2) The final level is n =2

3) The number of photons is 1 * 10^ 22

Recall that we must first convert the energy to joules as follows;

1 eV = 1.6 * 10^ -19 J

1.89 eV = 1.89 eV * 1.6 * 10^ -19 J/ 1 eV

= 3.024 * 10^ -19 J

Again;

E = hc/λ

E = energy

h = Plank's constant

c = speed of light

λ = wavelength

3.024 * 10^ -19 J = 6.6 * 10^ -34 * 3 * 10^ 8/λ

λ = 6.6 * 10^ -34 * 3 * 10^ 8/3.024 * 10^ -19 J

= 6.5 * 10^ -7 m

2)

Now we have;

E = -RH (1/\(n_{2} ^{2}\) - 1/\(n_{1} ^{2}\))

RH = Rydberg constant

Initial level = 2

Final level = x

Energy =  1.89 eV or 3.024 * 10^ -19 J

3.024 * 10^ -19  = - 2.18 * 10^ -18 (1/x^2 - 1/4)

3.024 * 10^ -19 /2.18 * 10^ -18 = 1/4 - 1/x^2

0.139 = 1/4 - 1/x^2

0.139 = 0.25 - 1/x^2

0.139 -  0.25  = - 1/x^2

-0.111 = - 1/x^2

0.111 = 1/x^2

x^2 = 9

x = 3

3) Let us find the energy from;

E = 6.6 * 10^ -34 * 3 * 10^ 8/400 * 10^-9

E = 0.0495 * 10^- 17 J

E = 4.95 * 10^ -19 J

Then;

5,000 J = n4.95 * 10^ -19 J

n = 5,000 J/4.95 * 10^ -19 J

= 1 * 10^ 22

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The attached image shows the arrangement of the elements in its correct location in the periodic  table.

The periodic table of the elements is a tabular display of the chemical elements that It is widely used in chemistry, physics, and other sciences.

The periodic table is referred to as tabular collection of chemical elements arranged according to atomic number, starting with hydrogen and going up to the element only with highest atomic number.

The outside electron clouds was used to determine the location of each element.

In order to determine the number of valence electrons inside an element, we locate the columns number which it falls under.

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Answer:

Empirical formula: CH₂

Explanation:

We need to find the empirical formula of a compound that has carbon and hydrogen.

To find the empirical formula of any compound, if we have the mass or mass percent, we should follow 3 steps:

1. Calculate the moles, dividing by the atomic weight.

The atomic weight for carbon and hydrogen are 12 g/mol and 1 g/mol, so, doing the division we have:

C = 85.5 / 12 = 7.125

H = 14.3 / 1 = 14.3

2. Determine the number of atoms of each element in the formula

To do this, we just divide the previous moles by the lowest quantity we obtain. In this case, the carbon:

C = 7,125 / 7,125 = 1

H = 14,3 / 7,125 = 2

This means we have 1 atom of carbon and 2 atoms of hydrogen.

3. Write the empirical formula with the previously obtained atoms

Now that we obtained the atoms of each element, we just write the empirical formula with these numbers:

C₁H₂  but we can neglect the number one so:

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The number of formula units present in 4.80×10⁻³ mole of NaI is 2.89×10²¹ formula units

From Avogadro's hypothesis, we understood that 1 mole of NaI contains 6.022×10²³ formula units as shown below

1 mole of NaI = 6.022×10²³ formula units

Therefore, we can obtain the formula units in 4.80×10⁻³ mole of NaI as follow:

From Avogadro's hypothesis,

1 mole of NaI = 6.022×10²³ formula units

Therefore

4.80×10⁻³ mole of NaI = 4.80×10⁻³ × 6.022×10²³

4.80×10⁻³ mole of NaI = 2.89×10²¹ formula units

Thus, the formula units present is 2.89×10²¹ formula units

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The mass of the silver chloride precipitate formed is 14.62 grams when 10.10 grams of silver trioxonitrate (V) reacts with 14.10 grams of sodium chloride.

Mass is a scientific term used to describe the quantity of matter within an object or substance. It is measured in kilograms (kg) or grams (g) and is often used to determine the density of an object. Mass is an intrinsic property of matter; it does not depend on the environment or location. Its magnitude remains the same regardless of any external influences such as gravity or pressure. It is also related to the force of gravity, which is the attraction between two objects that have mass.

Mass is the measure of the amount of matter in an object. It is measured in units such as grams (g), kilograms (kg), ounces (oz), and pounds (lbs). In this example, the mass of silver chloride precipitate formed when 10.10 grams of silver trioxonitrate (V) reacts with 14.10 grams of sodium chloride to form 9.58 grams of sodium trioxonitrate (V) is 4.52 grams. This can be determined by subtracting the mass of the reactants (10.10+14.10=24.20 grams) from the mass of the products (9.58 grams). Therefore, the mass of the silver chloride precipitate formed is 4.52 grams.

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