in attempting to explain the line spectrum of hydrogen, bohr suggested that the energy of electrons in atoms is

Answer:

One

Explanation:

A unicellular organism consists of one cell.

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The formula managers use to calculate a food service operation's total expense percentage is to divide the total cost of food by total sales.

The resulting amount should then be multiplied by 100 to get the percentage. A food service operation's total expense percentage is the percentage of its total sales that are spent on food.

The formula to calculate the food service operation's total expense percentage is:

Expense percentage = (Total cost of food / Total sales) * 100

This formula gives the total amount or the total expense percentage which a food service operation spends on its food to generate its total sales or revenue.

In this calculation, the total cost of food includes all expenses associated with purchasing, preparing, and serving the food, such as ingredients, labor, and supplies.

The calculation of the food service operation's total expense percentage is critical for the management and profitability of the business. It helps to determine the actual cost of the food and the operation's overall profitability.

By comparing the expense percentage of the business with industry standards and previous performance, management can make informed decisions to control costs, increase revenue, and maximize profits.

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The major disadvantage is - Ozone decomposes quickly and does not provide long-term protection against possible contamination as the water is piped through a municipal distribution system.

The gas ozone (O3) is unstable. As a result, it breaks down quickly, oxidizing any organic impurities present in the water including bacteria, viruses, and germs, but because it is a gas, it leaves the water after the oxidation is complete. Therefore, when the ozone started to disintegrate at first, the water may have various additional contaminants that mix with it as it travels through the municipal distribution system. Water carries through the new pollutants from the pipes. Ozone therefore has no long-term effect.

Chlorination produces trihalomethane, not ozonation, hence the expansiveness of ozone is dependent on the impurity of the water. Trihalomethane is produced by chlorination, not ozonation. Although ozone as a gas has a faint odor, when it is combined with water, it oxidizes the pollutant and breaks down, leaving no ozone in the water. Therefore, water does not smell like ozone.

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Answer:

Modern recorders are most commonly pitched at A=440 Hz, but among serious amateurs and professionals, other pitch standards are often found. For the performance of baroque music, A=415 Hz is the de facto standard, while pre-Baroque music is often performed at A=440 Hz or A=466 Hz.

Explanation:

Answer

Climate, because this describes what the weather is like over a long period of time.

The typical triple bond consists of one sigma bond and two Pi bonds. The Correct option is a.

A triple bond is a type of covalent bond that involves the sharing of three electron pairs between two atoms. The three electron pairs consist of one sigma bond and two Pi bonds.

The sigma bond is formed by the overlap of two atomic orbitals directly between the bonded atoms, while the Pi bond is formed by the overlap of two atomic orbitals that are parallel to each other but perpendicular to the line between the bonded atoms.

Because of the presence of two Pi bonds, a triple bond is stronger than a double bond and a single bond, and it is also shorter in length. Triple bonds are commonly found in molecules such as nitrogen gas (N₂) and acetylene (C₂H₂). Thus, option a is correct.

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Answer: FALSE

Explanation:

The balanced net ionic equation for the reaction of aqueous sodium carbonate and aqueous magnesium nitrate is:

\2Na+(aq) + CO32-(aq) + Mg2+(aq) + 2NO3-(aq) → MgCO3(s) + 2Na+(aq) + 2NO3-(aq)
The net ionic equation is obtained by canceling out the spectator ions on both sides of the equation. In this case, the sodium ions (Na+) and nitrate ions (NO3-) are the spectator ions.
The net ionic equation is:
\CO32-(aq) + Mg2+(aq) → MgCO3(s)
This shows that the carbonate ions (CO32-) and magnesium ions (Mg2+) react to form solid magnesium carbonate (MgCO3).However, the net ionic equation only includes the species that participate in the reaction, which are the sodium carbonate anion (CO3^2-) and the magnesium cation (Mg^2+):

\CO3^2-(aq) + Mg^2+(aq) → MgCO3(s)

Note that the sodium and nitrate ions are not included in the net ionic equation because they are spectator ions and do not participate in the reaction.

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Bond order, as we know, is inversely related to bond length. Bond length decreases when bond order increases and vice versa. Increasing order of bond length will be SO2<SO42-<SO32-. 

Sulphur dioxide has the lowest bond length, whereas sulphite ion does have the longest. Bond order is really the number of electron bonding pairs that exist between two atoms. A single bond has a bond order of one in a covalent bond between two atoms, a double bond does have a bond order of two, a triple bond does have a bond order of three, and on and on. Bond length and bond order are connected; when more electrons engage in bond formation, the bond is shorter. Bond length is often inversely linked to bond strength and bond dissociation energy, thus a stronger bond would be shorter if all other conditions are equal. Half the bond distance between two similar atoms equals the covalent radius.

Bond lengths typically measured inside the solid phase using X-ray diffraction, and in the gas phase using microwave spectroscopy. A bond between a particular pair of atoms might differ amongst molecules. Methane, for example, has different carbon-hydrogen bonds than methyl chloride. However, generalizations are conceivable when the overall structure remains the same.

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Answer:

its ability to lose electron

The reactivity of an alkali metal is determined by its ability to loose electrons.

The alkali metals are highly electropositive. They easily loose electron to form a univalent positive ion.

This ability to form a univalent positive ion increases down the group hence cesium is the most electropositive element in nature.

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Answer:

200Joules

Explanation:

W=Fd                                                                                                                                         W=10×20                                                                                                                             W=200J

To determine the number of grams of Al(OH)3 that can be neutralized, we need to calculate the moles of HCl using its concentration and volume.

The concentration of hydrochloric acid (HCl) is given as 0.250 M, which means there are 0.250 moles of HCl in 1 liter of solution. Since the volume given is 300 mL (0.300 L), we can calculate the moles of HCl as follows:

0.250 M * 0.300 L = 0.075 moles of HCl

The balanced chemical equation for the neutralization reaction between HCl and Al(OH)3 is:

3HCl + Al(OH)3 → AlCl3 + 3H2O

From the equation, we can see that 3 moles of HCl react with 1 mole of Al(OH)3.

Therefore, the moles of Al(OH)3 that can be neutralized by 0.075 moles of HCl is:

0.075 moles HCl * (1 mole Al(OH)3 / 3 moles HCl) = 0.025 moles Al(OH)3

To calculate the grams of Al(OH)3, we need to know its molar mass, which is 78 g/mol.

Thus, the grams of Al(OH)3 that can be neutralized is:

0.025 moles Al(OH)3 * 78 g/mol = 1.95 grams Al(OH)3.

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Answer:

Volume also reduced to half

Explanation:

Volume and absolute temperature are directly proportional to each others

Answer:

high melting point

Explanation:

high melting point

The substance that is the first product of the decomposition of organic matter, its presence in water usually indicates "fresh pollution" of sanitary significance is a. ammonia

Ammonia is produced when organic matter, such as plant and animal waste, breaks down. It is a common component in wastewater and can lead to pollution if not properly managed. The presence of ammonia in water is a concern because it can cause health issues and harm aquatic life.

In high concentrations, ammonia can be toxic to both humans and animals. It also serves as a source of nutrients for algae, which can lead to eutrophication and oxygen depletion in water bodies. Thus, monitoring ammonia levels is important to ensure the health and safety of both people and the environment. The substance that is the first product of the decomposition of organic matter, its presence in water usually indicates "fresh pollution" of sanitary significance is a. ammonia

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Because sodium has a valency of 1, the mass equivalent of a photon is 3.37 1036 kg. Emissions with a wavelength of 446 nm give sodium flames their distinctive yellow hue.

In order to answer this issue, we must first determine the photon's energy. We then use an equation to convert that energy to mass energy. We can get the mass equivalent of a photon, as requested in the question, using mass equivalent.

The special relativity theory of Einstein led to the equality of mass and energy. Which merely means that energy can be transformed into mass and the reverse.

E=h×c/λ

E = energy of photon

h = planck's constant =6.626×10^−34Js

c = speed of light = 3×10^8m/s

λ= Wavelength of photon = 589nm=598×10^−9m

E=3.37×10^−19J

From mass energy equivalence we know,

E=mc^2

M=3.37×10^−36kg

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The boiling point of water is dependent on the pressure exerted on the liquid. In this case, water boils at 90°C when the pressure exerted on the liquid equals 101.3 kPa, which is equivalent to atmospheric pressure. At different pressures, the boiling point of water will vary.

The boiling point of a substance is the temperature at which its vapor pressure equals the external pressure exerted on the liquid. When the external pressure is equal to the vapor pressure, the liquid starts to vaporize and boil.

In the given options, the pressure values are provided, and we need to determine which pressure corresponds to the boiling point of water at 90°C.

At standard atmospheric conditions, the pressure is approximately 101.3 kPa, which is equivalent to 1 atmosphere (atm) or 760 mmHg. This is also known as the normal boiling point of water, where water boils at 100°C.

Based on this information, we can conclude that option (3) 101.3 kPa is the correct choice. At this pressure, water boils at 90°C.
Therefore, the boiling point of water is affected by the pressure exerted on the liquid, and at 101.3 kPa, water boils at 90°C. At higher pressures, such as option (4) 120 kPa, water would boil at a higher temperature, and at lower pressures, such as options (1) 65 kPa or (2) 90 kPa, water would boil at a lower temperature.

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Answer:

5.9×10^20=158.875

Explanation:

mass of Cu = 2.501 g × 2.5% Cu/100 = 0.062525 g Cu

mass of Zn = 2.501 g × 97.5%/100 = 2.438475 g Zn

Calculate mol Cu: n = m/M; n = mole = ? mol; m = mass (g) = 0.062525 g Cu; M = molar mass (g/mol) = 63.546 g/mol Cun; Cu = 0.062525 g Cu/63.546 g/mol Cu = 0.00098393 mol Cu

Calculate the number of atoms of Cu:

1 mol atoms = 6.022×10^23 atoms

0.00098393 mol Cu × 6.022×10^23 atoms/mol = 5.9×10^20 atoms Cu to two significant figures

Calculate mol Zn:n = ? mol; m = 2.438475 g Zn; M = 65.39 g/mol Zn; n Zn = 2.438475 g Zn/65.39 g/mol Zn = 0.037291 mol Zn

Total number of atoms in a copper penny:

5.9×10^20 atoms

The number of atoms present in 2.50 grams of copper is equal to 3.93 × 10²¹  atoms.

Avogadro’s number can be described as the number of elementary entities in one mole of any chemical substance or element. Generally, these elementary units can be ions, molecules, atoms, electrons, or protons, according to the type of chemical reaction or reactant and product.

The value of Avogadro’s constant in one mole of a compound is approximately equal to 6.022 × 10²³ mol⁻¹.

Given, the mass of the copper = 2.50 g

the mass of one mole of copper = 63.5 g

The number of Cu atoms in one mole  = 6.022 × 10²³

63.5 g of copper contains Cu atoms = 6.022 × 10²³

2.50 grams of  copper contains Cu atoms = (6.022 × 10²³) × (2.50/63.5)

The number of Cu atoms = 3.93 × 10²¹ atoms

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Answer:

b

Explanation:

Answer:

The answer is B

Explanation:

Answer:

Lichens love clean air

Explanation:

Lichens love clean air too - in fact, their sensitivity to air pollution means they make great air quality indicators. Like small signposts, these curious organisms can tell us a lot about the air we are breathing.

Answer:

(A) there are 12

Explanation:

bc

[Kr]5s²4d10⁵p² represents iodine element. The fundamental components of matter are thought to be the elements.

A material is considered an element if it cannot be divided into two or even more simpler compounds by any kind of chemical process, including the use of light or warmth. For instance, when melting the chunk of gold, it nevertheless melts but remains as the precious metal element. 

The fundamental components of matter are thought to be the elements. There are currently 118 known elements, 94 of which are found in nature while the remaining 24 are created artificially. [Kr]5s²4d10⁵p² represents iodine element.

Therefore,  [Kr]5s²4d10⁵p² represents iodine element.

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This law states that matter can neither be created nor destroyed in an ordinary chemical reaction, but can change from one form to another.

What this implies is that when two elements or compound combine as a reactant to form a product, there's no loss of matter and the mass of the reactants must be equal to the mass of the product.

Given that

AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃

If we look closely at the above reaction, we would see that aluminuim is not balanced, potassium is also not balanced, bromine is not balance as well as sulphur and oxygen.

Let's put two moles attached to the AlBr₂ and three moles of K₂SO₄

2AlBr₃ + 3K₂SO₄ →

This would give us

6KBr + Al₂(SO₄)₃

If we add the two equations together,

2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃

From the above, we have

2 atoms of Al on the reactant side and 2 atoms of Al on the product side

6 atoms of Br on the reactant side and 6 atoms of Br on the product side

6 atoms of K on the reactant side and 6 atoms of K on the product side

3 atoms of S on the reactant side and 3 atoms of S on the product side

12 atoms of O on the reactant side and 12 atoms of O on the product side

Answer:

Explanation:

A .

Answer:

5 moles

Explanation:

First, write out the balanced equation:

2Al + Fe₂O₃ → Al₂O₃ + 2Fe

Reaction ratio of Al to Fe₂O₃ is:

2 : 1

This means 2 moles of Al will react with 1 mole of Fe₂O₃

Al: 5 mol

Fe₂O₃: 3 mol

Multiply the reaction to get moles of both reactants you have:

2 : 1 (×⁵/₂) = 5 : ⁵/₂

2 : 1 (×3) = 6 : 3

In other words, 5 moles of Al will react with ⁵/₂ moles of Fe₂O₃;

And 3 moles of Fe₂O₃ will react with 6 moles of Al;

But, we do not have 6 moles of Al, therefore only the 5 moles of Al available will react;

5 moles of Al reacts with ⁵/₂ moles of Fe₂O₃, as we can see from the ratios we calculated above, the remaining ¹/₂ mole of Fe₂O₃ will not react;

We say that Al is the limiting reactant because all the Al will react but all the Fe₂O₃ does not (i.e. it is in excess);

Next and last, the reaction ratio of Al to Fe is:

2 : 2 or, more simply 1 : 1

This means the moles of Al that reacts is the equal to the moles of Fe produced from the reaction;

We've established that 5 moles of Al will react with ⁵/₂ moles of Fe₂O₃, so 5 moles of Fe will also be produced (since the ratio is 1 : 1);

You could also work this out using the moles of Fe₂O₃ that react;

The reaction ratio of Fe₂O₃ to Fe:

1 : 2

So the moles of Fe produced is 2× the moles of Fe₂O₃;

If ⁵/₂ moles of Fe₂O₃ reacts, then simply multiply this by 2 which is 5 moles

The mass of 4.50 x 10²² formula units of CoSO₄ will be 11.57 g

The formula unit is the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.

As 1 mole (i.e, 6.023 x 10²³ molecules) of CoSO₄ weighs 154.99 g

Therefore,

4.50 x 10²² formula units (Molecules) of CoSO₄ weighs

154.99 / 6.023 x 10²³  x  4.50 x 10²²  = 11.57 g CoSO₄

Hence, The mass of 4.50 x 10²² formula units of CoSO₄ will be 11.57 g

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697.455 x \(10^{22}\) g/mol is the mass of 4.50 x \(10^{22}\) formula units of \(COSO_4\).

A formula unit is the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.

To find the mass of 4.50 x 1022 formula units of \(COSO_4\), we need to multiply 4.50 x 1022 with molar mass.

4.50 x \(10^{22}\) x 154.99 g/mol

697.455 x \(10^{22}\) g/mol

Hence, 697.455 x \(10^{22}\) g/mol is the mass of 4.50 x \(10^{22}\) formula units of \(COSO_4\)

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Answer:

it will gain electrons to fill its outer shell

Explanation:

This element is boron which has 5 electrons.

Answer:

Please check:  6.67×104⁰ .  What is the \(^{0\\\) after the 104? I'll assume this is meant to read:  6.67x10^40 chlorine molecules.

Explanation:

6.67x10^40 molecules

One mole = 6.02x10^23 molecules

(6.67x10^40 molecules)*(1 mole/6.02x10^23 molecules) = 1.10x10^17 moles chlorine

Answer:

D because electron is negatively charge around the nucleus

electrons are found outside the nucleus

An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.

Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons.  Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.

The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.

The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull  from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.  

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