Which event may occur when ocean salinity increases?

mass of water increases
freezing point of water increases
sunlight in deeper locations decreases
amount of dissolved gases in water increases

The answer for the percentage yield is 80%.

What is percentage yield?

Recovery is the ratio of actual recovery to theoretical recovery. It is calculated by dividing the experimental yield by the theoretical yield and multiplying by 100%. If the actual and theoretical yields are equal, the yield rate is 100%. Yields are usually less than 100% because actual yields are often lower than theoretical. This may be due to incomplete or competing reactions and sample loss during recovery. Recoveries can exceed 100%. This means that more samples were recovered from the reaction than expected. This can occur when other reactions that form the product occur. Another potential source of error is overage caused by incomplete removal of moisture or other contaminants from the sample. Yield is always positive.

Therefore, The answer for the percentage yield is 80%.

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The concentration of  Fe³⁺ in Jordan Lake is = 8.09 × 10⁻⁵ M  

The Beer-Lambert Law, also known as Beer's Law, Lambert-Beer Law, or Beer-Lambert-Bouguer Law, relates the attenuation of light to the properties of the material through which the light passes.

According to Lambert-Beer's law, the absorbance of a sample is directly proportional to its concentration.

The reaction that produces a red complex

Fe³⁺ + KScN ⇒ Fe ( SCN )₃  ( red complex )

Concentration of  Fe³⁺ in  reference sample

= 4.80x10⁻⁴ × ( 5.0 / 50.0 ) = 4.80 × 10⁻⁵M  

Reference sample was diluted from 5.0 mL to 50.0 mL

Concentration of 4.80 × 10⁻⁵M  has an absorbance = 0.512

Given that Lake sample absorbance is 0.345

Concentration of lake sample :

= absorbance of lake sample × ( conc of reference sample / absorbance )

= 0.345 × (4.80* 10⁻⁵ / 0.512)  = 3.23 × 10⁻⁵M.

Concentration of Fe³⁺ in Jordan  lake

=  3.23 × 10⁻⁵ × ( 50.0mL / 20.0mL) = 8.09 × 10⁻⁵ M  

Solution was diluted from 20.0 mL to 50.0 mL

Hence we can conclude that The concentration of  Fe³⁺ in Jordan Lake is = 8.09 × 10⁻⁵ M.

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Answer:

the answer is a because if u have good wheather the panels will for no matter what

Among the following, molar mass is the one that has unit of g/mol. option C is the correct answer.

Molar mass refers to the mass of one mole of a substance. its units are grams per mole (g/mol).

It is calculated by adding up the atomic or molecular masses of all the atoms or molecules in a substance. It is a very important subject in chemistry.

Therefore, among the following options, molar mass has the unit of g/mol.

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Answer: D

Explanation: Firstly, you have to complete the charge. You have to get e equal to 2e. So you multiply the second line by 2. Therefore you get

2Ag+ 2e>2Ag. And the Ni line would stay the same. Therefore you combine the elements from before the arrow and then combine the elements after the arrow. Therefore, you get answer D.

Total pressure = 4.9 atm

Partial pressure of neon =  3.4 atm

Partial pressure of oxygen = 1.5 atm

We know that the partial pressure could be obtained as the product of the mole fraction and the total pressure thus we have to obtain the total pressure by the use of the partial pressures.

For the number of moles of helium;

P = 101.3 kPa or 0.99 atm

T =  25ºC or 298 K

V =  27 L

n = PV/RT = 0.99 atm * 27 L/0.082 *  298 K = 26.73/24.44 = 1.1 moles

Number of moles of oxygen

P = 101.3 kPa or 0.99 atm

T =  25ºC or 298 K

V =  12 L

n = PV/RT = 0.99 atm * 12 L/0.082 *  298 K =11.88 /24.44 = 0.5 moles

Total number of moles = 1.1 moles + 0.5 moles = 1.6 moles

Total pressure is obtained from;

nRT/V

= 1.6 moles * 0.082 * 298/8

= 4.9 atm

Partial pressure of neon = 1.1 moles/1.6 moles * 4.9 atm = 3.4 atm

Partial pressure of oxygen = 0.5 moles/1.6 moles * 4.9 atm = 1.5 atm

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Answer:

the molecular formula of the compound is N9O9.

Explanation:

To determine the molecular formula of the compound, we need to know the empirical formula mass of NO. The empirical formula of NO indicates that the compound contains one nitrogen atom and one oxygen atom.

The empirical formula mass of NO can be calculated as:

Empirical formula mass = atomic mass of N + atomic mass of O

Empirical formula mass = 14.01 + 16.00

Empirical formula mass = 30.01

The mass of the compound is given as 276. We can use this information along with the empirical formula mass to calculate the factor by which the empirical formula should be multiplied to obtain the molecular formula.

Factor = Molecular mass / Empirical formula mass

Factor = 276 / 30.01

Factor = 9.198

The molecular formula can be obtained by multiplying the empirical formula by this factor:

Molecular formula = Empirical formula x Factor

Molecular formula = NO x 9.198

Molecular formula = N9O9

Therefore, the molecular formula of the compound is N9O9.

Energy required to raise the temperature from 35°C - 45 °C= 25116 J.

specific heat, the quantity of warmth required to raise the temperature of one gram of a substance by means of one Celsius degree. The units of precise warmth are generally energy or joules consistent with gram according to Celsius diploma. for instance, the unique warmth of water is 1 calorie (or 4.186 joules) according to gram in step with Celsius degree.

solving,

Sample of liquid = 400. 0 g

temperature = 30. 0 ºc

joules of energy are required to raise the temperature of the water to 45. 0 ºc

therefore rise in temperature 45 - 30 = 15°C

Specific heat capacity = 4.186 J/g m °C

In kelvin = 273 + 15 = 288

          = ∴ energy required = Q = m s ( t final - t initial)

            =  400*4.186 * 15

           = 25116 joule

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The answer is c. 8 electrons are in bromine's next to outer shell (n = 3). Therefore, the answer is c. 8 electrons are in bromine's next to outer shell (n = 3).

Bromine has an atomic number of 35, which means it has 35 protons in its nucleus and 35 electrons in its electron cloud. To determine the number of electrons in bromine's next to outer shell (n = 3), we need to look at the electron configuration of bromine. The electron configuration of bromine is: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

The electrons in the outermost shell (n = 4) are the valence electrons, which are involved in chemical reactions. However, we are interested in the electrons in the next to outer shell (n = 3), which are also important in determining chemical properties. To determine the number of electrons in the next to outer shell, we need to subtract the number of electrons in the outermost shell (n = 4) from the total number of electrons in the atom.

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The value of Ksp at 25°C for magnesium carbonate is 9.98 x \(10^{(-6)\)\(mol^2/L^2\), rounded to 2 significant figures.

The solubility product constant (Ksp) represents the equilibrium constant for the dissolution of a sparingly soluble compound in water. For magnesium carbonate, the balanced equation for its dissolution can be written as:

\(MgCO_3\)(s) ⇌ \(Mg^{(2^+) }(aq) + CO3^{(2-) }(aq)\)

The solubility of magnesium carbonate is given as 3.16 x \(10^{(-3)\) mol/L. In this case, the concentrations of \(Mg^{(2^+)\) and \(CO_3^{(2^-)\)ions in the equilibrium expression are both equal to the solubility value, which can be represented as \([Mg^{(2^+)}] = [CO_3^{(2^-)}] = 3.16 * 10^{(-3)\) mol/L.

The equilibrium expression for the dissolution reaction can be written as:

Ksp =\([Mg^{(2^+)}] *[CO_3^{(2^-)}]\)

Substituting the solubility value into the equation, we have:

Ksp = (3.16 x \(10^{(-3)\) mol/L) * (3.16 x \(10^{(-3)\)mol/L) = 9.98 x \(10^{(-6)\)\(mol^2/L^2\)

Thus, the value of Ksp at 25°C for magnesium carbonate is 9.98 x\(10^{(-6)} mol^2/L^2\), rounded to 2 significant figures.

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It is possible for a person to give off nonalcoholic organic vapors, as the human body produces a variety of volatile organic compounds (VOCs) through various metabolic processes.

However, the amount and type of VOCs emitted by an individual can vary based on factors such as diet, activity level, and genetics.

Additionally, the presence of nonalcoholic organic vapors in a person's breath or sweat does not necessarily indicate any health concerns or problems.

It is not likely that a person gives off nonalcoholic organic vapors, as the human body typically does not produce or emit such substances in significant amounts.

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Answer:B

Explanation:Because when the object heats up the particles move faster and it will turn into a liquid or gas but if it is being cooled then the particles will slow down and either make a liquid or solid.

When the mass of the solid increases, its volume will decrease, while when the volume of the liquid increases, its mass will increase. This is because the densities of these materials are determined by the amount of mass that can be held in a given volume.

The volume of the solid is directly proportional to its mass. It means, as the mass of the solid increases, its volume will also increase. Hence, we can predict that as the mass of the unknown solid increases, its density will also increase because the volume of the solid will increase, but the amount of space it occupies will not change.

The mass of the liquid is directly proportional to its volume. It means, as the volume of the liquid increases, its mass will also increase. Hence, we can predict that as the volume of the unknown liquid increases, its density will decrease because the mass of the liquid will increase, but the amount of space it occupies will also increase.

Therefore, we can conclude that the density of the unknown solid will increase with increasing mass, and the density of the unknown liquid will decrease with increasing volume.

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Answer:

Radiant energy passes across Earth's system boundary, but not mass.

Explanation:

In a closed system, no substance can escape or be added to it. Energy, on the other hand, can still reach the system or leave the system again.

Answer: radiant energy passes across Earth's system boundary, but not mass

Explanation:

100% K12 test

Answer:

wind is the correct answer

A balanced chemical equation demonstrates the Law of Conservation of Mass if: D. It shows that no atoms have been gained or lost during the reaction.

A chemical equation can be defined as the symbolic representation of a chemical reaction between two or more chemical elements, through the use of chemical symbols and formulas.

A balanced chemical equation is a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.

This ultimately implies that, both the charge on each atom and sum of the masses of the chemical compounds or elements in a chemical equation are properly balanced.

The Law of Conservation of Mass (LOCOM) states that mass is neither created nor destroyed in any chemical reaction.

Hence, a balanced chemical equation requires the same number of atoms on the reactant side and product side of a chemical reaction.

In conclusion, LOCOM is demonstrated by a balanced chemical equation if it shows that no atoms have been gained or lost during the chemical reaction.

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Answer:

I think that it's D

Explanation:

Since siderite has always had the chemical symbol feco3, it belongs to the carbonate class of rocks.

The atoms in each element of a compound is revealed by the molecular formula. It includes the symbols for the atoms of each element found in the compound, together with a tally of how many of each element there are overall in the shape of subscripts. Empirical, molecular, and structure chemical formulas are the three basic categories. The lowest whole-number ratio of the atoms in a compound has been shown by empirical formulae, the numbers of every form of atom in a molecule is shown by molecular formulas, and the bonds between the atoms or molecules are being shown by structural formulas.

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Answer: Sunlight

Explanation:

According to Goog|e, "In addition to assisting in the development of heat within the structure, glass in greenhouses assists in the management of light within the greenhouse. The glass allows light to be transmitted from the sun to the plants within the structure, allowing the plants to grow properly."

I hope this helps!

The limiting reagent in this scenario is \(O_{2}\) because we have more \(H_{2}\) (20 moles) than is required (16 moles).

We must compare the mole ratios of the reactants to the stoichiometry of the balanced equation in order to identify the limiting reagent. The reaction's balanced equation is as follows:

2 H₂ + O₂ -> 2 H₂O

We can deduce from the equation that the \(O_{2}\) to \(H_{2}\) ratio is 1:2. Therefore, we require two moles of \(H_{2}\) for every one mole of \(O_{2}\).

We can determine the quantity of \(H_{2}\) required for the reaction if we have 8 moles of \(O_{2}\) and 20 moles of \(H_{2}\):

2 moles of \(H_{2}\) divided by 1 mole of \(O_{2}\) results in 16 moles of \(H_{2}\).

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No, gamma radiation cannot be stopped by paper. Gamma radiation is a form of electromagnetic radiation, and is composed of high-energy photons.

Paper is not able to absorb or stop these photons, so gamma radiation is able to penetrate through paper and other materials. To stop gamma radiation, it is necessary to use a shield made from a material with a high atomic number, such as lead, which can absorb the gamma rays.

Gamma radiation is one of the most dangerous forms of radiation, as it is capable of penetrating deep into the human body and causing serious damage to cells and tissues. It is an ionizing radiation, which means it can break the bonds between atoms and cause chemical changes in the cells it passes through. This can lead to mutations, cancer, and other long-term health problems.

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Zirconium (Zr) has an average atomic mass of 91.22 amu and is made up of the isotopes 90Zr, 91Zr, 92Zr, 94Zr, and 96Zr. The atom of which isotope has the greatest mass?To determine the isotope with the largest mass, we must first understand what isotopes are. Isotopes are atoms that have the same atomic number but a different number of neutrons, resulting in a different atomic mass.

As a result, we can determine the mass of a specific isotope by determining the number of neutrons it contains. This is done by subtracting the atomic number from the atomic mass.For example, in the case of 90Zr, the atomic number of zirconium is 40, and the atomic mass of this isotope is 90. As a result, the number of neutrons in this isotope is equal to 90 - 40 = 50. We can repeat this process for the other zirconium isotopes, as follows:
- For 91Zr, neutrons = 91 - 40 = 51
- For 92Zr, neutrons = 92 - 40 = 52
- For 94Zr, neutrons = 94 - 40 = 54
- For 96Zr, neutrons = 96 - 40 = 56
As a result, we can see that the isotope with the largest mass is 96Zr, with a mass of 96 atomic mass units.

Therefore, we can conclude that the atom of the isotope 96Zr has the greatest mass among all the isotopes of zirconium.

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Zirconium (Zr) has an average atomic mass of 91. 22 amu and is made up of the isotopes 90Zr, 91Zr, 92Zr, 94Zr, and 96Zr. The atom of which isotope has the greatest mass is 96Zr.

What are isotopes?Isotopes are atoms of a single element with differing numbers of neutrons in their nuclei. In addition, isotopes have the same atomic number and, as a result, the same number of electrons, but different atomic masses or mass numbers due to their differing numbers of neutrons.Isotope abundances are different in different materials and can also be modified over time by radioactive decay or other processes.The mass of an atom is primarily determined by the number of neutrons and protons in its nucleus. Because the number of electrons in the atom's outermost shell determines its chemical behavior, the number of neutrons in an atom's nucleus has little impact on its chemical behavior.

Zirconium (Zr) has an average atomic mass of 91.22 amu and is made up of the isotopes 90Zr, 91Zr, 92Zr, 94Zr, and 96Zr. To determine which of these isotopes has the greatest mass, look at the atomic number of each isotope:90Zr has a mass of 89.904 amu91Zr has a mass of 90.904 amu92Zr has a mass of 91.905 amu94Zr has a mass of 93.906 amu96Zr has a mass of 95.908 amuThe atom with the highest mass is 96Zr, which has a mass of 95.908 amu. Therefore, the atom of which isotope has the greatest mass is 96Zr.

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Answer:

The mass of water that uses 7500 J to increase the temperature from 2°C to 3°C is 179.543 grams

Explanation:

The given parameters are

Change in Heat , ΔH = 7500 J

The change in temperature ΔT = 2°C to 3°C = 3 - 1 = 1°C

The specific heat capacity for water is given as Δc = 4.184 J/(g·°C)

The heat of fusion, \(\Delta H_{fus}\) = 334 J/g

The heat of vaporization, \(\Delta H_{vap}\) = 2260 J/g

The formula for heat capacity is given as follows;

ΔH =  m × Δc × ΔT

Given that the temperature of the process is above the melting point temperature of 0°C and below the boiling point temperature of 100°C, we make use only of the heat capacity of liquid water

Therefore, we have;

7500 J = m × 4.184 × 1

\(m = \dfrac{7500}{4.184 \times 1} = 1792.543 \ g\)

The mass of water that uses 7500 J to increase the temperature from 2°C to 3°C = 179.543 grams.

Answer: he shot tiny alpha particles throug a piece of gold foil.

Explanation:

Answer:  9.007

Explanation:

Be-8  8 x   0.20%  = 0.016

Be-9 9 x 98.90% =     8.901

Be-10 10 x 0.90%  =        0.09

        100.00%       9.007

The vapour pressure of mentioned solution of sucrose and water is 23.5 mm Hg.

The formula to be used for the calculation is from Raoult's law -

vapour pressure = vapour pressure of water × mole fraction

Number of moles = mass/molar mass

Molar mass water = 18 g/mol

Molar mass sucrose = 342.3 g/mol

Moles of water = 250/18

Moles of water = 13.9

Moles of sucrose = 40/342.3

Moles of sucrose = 0.12

Mole fraction of water = 13.9/(0.12 + 13.9)

Mole fraction of water = 13.9/(14.02)

Mole fraction of water = 0.99

Vapour pressure = 23.76 × 0.99

Vapour pressure = 23.5 mm Hg

The vapor pressure of the solution is 23.5 mm Hg.

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A true statement about hybridization and hybrid orbitals is that sp2 hybrid orbitals are formed from the mixing of one s and two p orbitals. Thus, the correct option is B.

The hybridization of orbitals is favored since hybridized orbitals are more directional which leads to more prominent cover when shaping bonds, in this manner the bonds shaped are more grounded.

The crossover orbitals can be characterized as the combination of standard nuclear orbitals coming about within the arrangement of modern nuclear orbitals.

Redistribution of the vitality of orbitals of person molecules to provide orbitals of equivalent vitality happens when two nuclear orbitals combine to create a crossbreed orbital in a particle.

This preparation is called hybridization.

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