Why is it that no two elements have the exact same emission spectrum?​

Answer:

Herbivores would increase causing producers to decrease.

Explanation:

If the carnivores are gone, herbivores wouldn't get eaten and increase, and more herbivores mean less producers available.

Answer:

According to VSEPR theory the molecule with six binding domains and single lone pair will have the pentagonal bipyramidal geometry. As it is known that six binding domains means six bonds and a single lone pair means one pyramidal bond, so that it does not repel bonds to a higher extent. Hence, total of seven bonds are required which is provided by the pentagonal bipyramidal geometry. The number of electrons of the molecule will be fourteen 2 from each of the 6 binding domains that makes up to 12 and 2 from the lone pair.

The percentage of plants showing phototropism is the dependent variable, and the color of the light is the independent variable. Therefore, the correct answer is: "the percentage of plants showing phototropism is the dependent variable, and the color of the light is the independent variable."

The dependent variable is the variable that is being measured or observed, and its value depends on the independent variable, which is the variable that is being manipulated or changed in the experiment. In this experiment, the percentage of plants showing phototropism is being measured, which means that it is the dependent variable. The color of the light is being manipulated, which means that it is the independent variable.

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The current that flows in the circuit is obtained as 1.23 A.

We know that the RLC circuit is one that contains a resistor in addition to a capacitor or an inductor. In either case, the resistance that is offered to the flow of current by the capacitor or the inductor as the case may be is called the reactance.

Given that;

Impedance (Z) = √R^2 + XC^2

R = resistance

XC = capacitive reactance

Z = √(40)^2 + (70)^2

Z = 81 ohms

Now;

V = IZ

V = voltage

I = current

I = V/Z

I =  100 volts/81 ohms

I = 1.23 A

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Answer:

distance and time

Answer:

d. Distance and time

Explanation:

Why was the American Federation of

Labor a different type of labor union

(compared to the Knights of Labor)

and why did it grow during the 20th

century?

Sodium is in a solid state at 20 degrees. Table salt, or sodium chloride, is another name for this substance. It is a solid, white crystalline substance that is easily fractious at 20 degrees.

Alkaline earth group (Group a and group b [Ia]) of something like the periodic table element sodium (Na). The element sodium is an extremely delicate silvery-white. Sodium makes up 2.8 percent of the Earth's crust and is the most prevalent alkali metal & sixth most plentiful element on the planet.

The main issue is typically having much more water in your body. The salt levels are diluted by the extra water. Hyponatremia is far less frequently brought on by severe sodium lauryl from human body.

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The mass number \(_{17} Cl^{35}\)   is  35.

The mass number  \(_{17} Cl^{37}\)   is  37.

isotopes of \(_{17} Cl^{35}\)   contains. and isotopes   \(_{17} Cl^{37}\) contain.

protons=17                                              protons= 17

neutrons=  18                                          neutrons=20

electrons= 17                                           electrons=17

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei) and position in the periodic table (and, therefore, belong to the same chemical element). However, isotopes have different nucleon numbers (mass numbers) because they have varying numbers of neutrons in their nuclei. All isotopes of a given element have nearly identical chemical properties but differ in terms of atomic mass and physical characteristics.

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Answer:  The inner layers are the Core, Radiative Zone and Convection Zone.

The outer layers are the Photosphere, the Chromosphere, the Transition Region and the Corona.

(phew! There you go!)

Answer:

heat and large amount of surface area

Explanation:

the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool

The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.

After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.

The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.

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ZnS is the chemical formula of the  zinc sulphide. Zinc sulphide contain two ions i.e. ( Zn ⁺² ) and ( S ⁻² ) ion present in zinc sulphide.

A Bronsted - Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or establish a covalent bond with an electron pair. Proton donors, also known as Bronsted - Lowry acids, are the first class of acids.

Any hydrogen containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

Thus, ZnS is the chemical formula of the  zinc sulphide. Zinc sulphide contain two ions i.e. ( Zn ⁺² ) and ( S ⁻² ) ion present in zinc sulphide.

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The volume of 1.5 × 10^(-2) M NaOH that must be added to 500 mL of 0.2 M HCl to give a solution that has a pH of 2.15 is 6.67 mL.

To solve this problem, we first need to write the balanced chemical equation for the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl), which is

NaOH + HCl → NaCl + H2O.

We are given the initial concentration of HCl as 0.2 M. We then use the pH value, which is 2.15, and the relationship between pH and the concentration of hydrogen ions ([H+]) to calculate the concentration of [H+] in the final solution.

Using the equation pH = -log[H+] and [H+] = 10^(-pH),

pH = -log[H+]

[H+] = 10^(-pH)

[H+] = 10^(-2.15) = 7.08 × 10^(-3) M

we find that [H+] = 7.08 × 10^(-3) M.

Next, we need to determine the mole ratio of NaOH to HCl, which we can find from the balanced chemical equation as 1:1. We then calculate the amount of NaOH required to react with all of the HCl in the initial solution, which is 0.1 moles.

moles of HCl = concentration × volume = 0.2 M × 0.5 L = 0.1 moles

moles of NaOH = 0.1 moles

Finally, we need to calculate the volume of 1.5 × 10^(-2) M NaOH required to provide 0.1 moles of NaOH.

moles of NaOH = concentration × volume

volume = moles of NaOH / concentration

volume = 0.1 moles / 1.5 × 10^(-2) M = 6.67 L

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it is thinner, denser, younger, and of different chemical composition.

It's the solid rock we live on. It is either continental or oceanic. The Continental crust is typically thirty to fifty km thick while the oceanic crust is only five to ten km thick. The oceanic crust is densely subduable, and constantly being destroyed and replaced at plate boundaries.

Earth has three layers crust, mantle, and core. The crust is made up of solid rocks and minerals. Beneath the crust is the mantle, also mostly solid rocks and minerals, but broken by malleable regions of semi-solid magma. At the center of the Earth is a hot, dense metallic core. The Continental crust is typically forty km twenty-five miles thick while the oceanic crust is much thinner, averaging about six km four miles thick.

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Answer:

Explanation:

The solution is a dilute solution of methanol. It is described as a "40% methanol" concentration which means the solution is 40% of methanol in the solution. In this solution, it is 40% of methanol and 60% of water. If any solution is to be prepared from this model, the solution must have 40% of methanol, hence to prepare a 200 mL of the same model (40%) of methanol solution, the volume of methanol would be 80 mL and the volume of water would be 120 mL.

Answer:

Answer:

Matter has particles called atoms.

They are indestructible and unchangeable.

When chemical reactions occur, they combine.

Categorized by weight of atoms.

Explanation:

Answer:

Matter has particles called atoms. They are indestructible and unchangeable. When chemical reactions occur, they combine.

Explanation:

Explanation:

it's a liquid at room temperature

The characteristics make mercury different from earth is that it has no moon and have hotter surface area than the earth.

Planets are the large bodies which do revolution around the sun in their definite orbits.

Mercury is one of the planet present in our solar system its size is smaller than the earth. In mercury moon is not present as it is present in our earth, also the surface temperature of the mercury is hotest as compared to other planets.

Hence on the basis of size & atmosphere mercury is different.

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Charcoal is the sample of this drawing medium have been dated back to 30,000 BCE and is denoted as option B.

This is referred to a black carbon residue which is heated in insufficient oxygen to give it a light weight.

It is used for drawing and has been in existence for as long as 30,000 BCE hence the reason why it is the most appropriate choice.

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Answer:

from area of high pressure to area of low pressure

Explanation:

this phenomenon occurs due to the heating of Earth's surface by the sun which is quite uneven hence, causing the air flow from high pressure to a significantly lower pressure area.

Answer:

Explanation:

????? i am having trouble according this

Answer:

A. can be separated by physical means.

Explanation:

A mixture is when two different materials are put in the same container and no reaction occurs.

The magnesium is the anode of a magnesium and zinc galvanic cell.

The magnesium is the anode means the site of oxidation, where magnesium ions flow into solution. Here the electrons leave the electrode and flow through the voltmeter as they move to the zinc cathode.

While on the other hand, zinc is the cathode i.e. the site of reduction, where zinc ions flow onto the electrode in order to pick up electrons so we can conclude that magnesium is the anode of a magnesium and zinc galvanic cell.

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Answer:ANSWER IS MG(s)

Explanation:

Approximately 2.7 liters of liquid diluent would be needed to make a 1:10 solution when added to 300 mL of a 30% solution.

To calculate the volume of the liquid diluent needed, we can set up a proportion based on the volume of the solute:

(30 grams / 100 mL) = (x grams / 3000 mL)

Cross-multiplying and solving for x:

30 grams * 3000 mL = 100 mL * x grams

90,000 grams * mL = 100 mL * x grams

x = (90,000 grams * mL) / (100 mL)

x ≈ 900 grams

Since the diluent is added to reach a total volume of 3000 mL, the volume of the diluent needed would be 3000 mL - 300 mL = 2700 mL.

Converting 2700 mL to liters:

2700 mL * (1 L / 1000 mL) = 2.7 liters

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The boiling point of a 1.58 m aqueous solution of CaCl2 is approximately 102.4352 °C.

The boiling point of a 1.58 m aqueous solution of CaCl2 can be calculated using the equation for boiling point elevation. The boiling point elevation is a colligative property, meaning it depends on the concentration of solute particles rather than the identity of the solute. In this case, the solute is CaCl2, which dissociates into three ions: one Ca2+ ion and two Cl- ions.

The boiling point elevation equation is ΔTb = Kb * m * i, where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant, m is the molality of the solution, and i is the van't Hoff factor, which represents the number of particles formed when the solute dissociates. For CaCl2, i = 3 because it dissociates into three ions. The molality of the solution is given as 1.58 m. The molal boiling point elevation constant for water is typically around 0.512 °C/m.

Plugging in the values, we can calculate the boiling point elevation: ΔTb = 0.512 °C/m * 1.58 m * 3 = 2.4352 °C. To find the boiling point of the solution, we add the boiling point elevation to the normal boiling point of water, which is 100 °C: Boiling point = 100 °C + 2.4352 °C = 102.4352 °C.

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If Planck's constant were approximately 50% bigger, atoms would be smaller. This is because Planck's constant plays a role in determining the energy levels and wavelengths of electrons in an atom.

With a larger Planck's constant, the energy levels and wavelengths would be smaller, meaning the electron orbits would be smaller and closer to the nucleus. This would result in a smaller overall size for the atom.

Planck's constant, denoted as "h," is a fundamental constant of nature that relates the energy of a photon to its frequency. It was first introduced by German physicist Max Planck in 1900 to explain the behavior of electromagnetic radiation emitted by heated objects, known as blackbody radiation.

The value of Planck's constant is approximately 6.626 x 10^-34 joule-second (J s). It is a key parameter in quantum mechanics and plays a critical role in determining the energy levels of atoms and molecules, the behavior of electrons in solids, and the functioning of many modern technologies, such as lasers, LEDs, and solar cells.

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There are approximately 12.7 grams of phosphorus in a 50-gram sample of aluminum phosphate.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to know the molar mass and the chemical formula of aluminum phosphate.

The chemical formula for aluminum phosphate is AlPO4. It indicates that each molecule of aluminum phosphate contains one aluminum atom (Al), one phosphorus atom (P), and four oxygen atoms (O).

To calculate the molar mass of aluminum phosphate, we can add up the atomic masses of its constituent elements based on their stoichiometric ratios:

Molar mass of AlPO4 = (molar mass of Al) + (molar mass of P) + (4 * molar mass of O)

Using the periodic table, we can find the atomic masses of the elements:

Molar mass of Al = 26.98 g/mol

Molar mass of P = 30.97 g/mol

Molar mass of O = 16.00 g/mol

Now, let's calculate the molar mass of aluminum phosphate:

Molar mass of AlPO4 = (26.98 g/mol) + (30.97 g/mol) + (4 * 16.00 g/mol)

= 121.95 g/mol

The molar mass of aluminum phosphate is 121.95 g/mol.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to calculate the mass fraction of phosphorus in the compound. The mass fraction is the ratio of the molar mass of phosphorus to the molar mass of aluminum phosphate.

Mass fraction of phosphorus = (molar mass of P) / (molar mass of AlPO4)

= (30.97 g/mol) / (121.95 g/mol)

≈ 0.254

Multiplying the mass fraction by the mass of the sample gives us the grams of phosphorus:

Grams of phosphorus = (mass fraction of phosphorus) * (mass of the sample)

= 0.254 * 50 g

≈ 12.7 g

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The mass of an object with a density of 1.35 g/ml & a volume of 24 ml is 32.4 g/ml.

Mass is the quantity of matter in a physical body.

The product of the molar mass of the compound and the moles of the substance are defined as mass.

Density is the mass per unit volume. Volume is the space taken by an object. Density, mass, and volume are interrelated to each other.

Given, that the density is 1.35 g/ml

The volume is 24 ml

The formula is

mass = volume x density

mass = 24 x 1.35 =  32.4

Thus, the mass of the object is 32.4 g/ml.

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Answer:

Lead

Explanation:

While taking sample from flint's distillery, theybfoind 13000 ppb or parts per billion lead in the water itself

Answer:

false tjytyjiy

Explanation:

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