Why are some energy resources more expensive to use than others?

Answer:selenium

Explanation:

Answer: Nether

Explanation: Because if you have one pound of Calcium and one pound of selenium there both the same weight  

The structures of the aldol addition and condensation products of pentanal are attached as an Image with this answer.

What is Aldol Addition ?

An aldol addition is a reaction that occurs between the enolate of an aldehyde or ketone and the alpha-carbon of another aldehyde or ketone to form a beta-hydroxy aldehyde or ketone.

The term aldol condensation has to do with a reaction in which a nucleophile attacks the carbonyl group of an aldehyde or a ketone to convert it to the enolate from which attacks another aldehyde or ketone at the carbonyl carbon to form the required product.

The product obtained in the process is shown in the image attached with the answer.

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One method for preventing oxidation of the object is painting it with iron material.

Oiling, painting, or lubricating By applying oil, grease, or paint, the surface is provided a waterproof coating that keeps moisture and oxygen from coming into direct contact with the iron item. Hence, rusting is prevented.

Oil-based metal paints are the best choice for outside work, according to paint manufactured with oil. Very durable and frequently easier to remove is oil paint. Primer is not necessary when using an oil-based product, although it will produce a smoother finish. Oil-based paints are often more costly.

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To produce 55.7 moles of H2, an equal number of moles of H2O is required. Therefore, 55.7 moles of H2O are needed.

The balanced chemical equation for the reaction in which H2 is produced from H2O is:

2H2O → 2H2 + O2

According to the stoichiometry of the equation, for every 2 moles of H2O, 2 moles of H2 are produced. This means that the mole ratio of H2O to H2 is 2:2, or simply 1:1.

Given that 55.7 moles of H2 are needed, the same number of moles of H2O is required. Therefore, 55.7 moles of H2O are needed to produce 55.7 moles of H2. The mole ratio of the reactants directly translates to the number of moles needed to obtain a certain amount of product in a stoichiometrically balanced equation.

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Answer:

1500

Explanation:

I believe this is correct but am not sure, I shall update when I submit my quiz...

Answer:

its obviously a chemical change

Explanation: Facts

The addition of the food color in water only causes the change in the cor of water but no new substance is formed. Therefore, the teacher is restarting the physical change.

A physical change can occur when the characteristics of the matter change but the identity does not. Physical changes are classified as: reversible and irreversible. For example, the melting of water is reversible in nature since the melted ice cube will be refrozen.

Physical change can be described as a kind of change where only physical properties of matter such as odor, color, solubility, etc. can change. During physical changes, there is no chemical bonds are broken or formed between atoms of the substance.

The chemical composition as well as the chemical nature of the substance remains unchanged during a physical change.  The molecules of matter can rearrange without changing the internal composition of matter.

Therefore, adding food color to water is a physical change as no new substance formed.

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Answer:

9.370 x 10 to the 23 molecules

Explanation:

91.72/1 x 1 mole Co/58.933g x 6.02 x 10 to the 23/1 mole Co

Answer:

Explanation:

Mass 1 mole of CO

C = 12

O = 16

m = 28

Mols of 91.72 grams

m = given Mass / Molar Mass

m = 91.72 / 28

m = 3.28 mols

Molecules

1 mol of anything is 6.02 * 10^23 molecules (in this case)

3.28 mol of CO = x

1/3.28 = 6.02*10^23/x      Cross multiply

x = 3.28 * 6.02 * 10^23

x = 1.97 * 10^24

Answer:

D. lipids

Explanation:

Hydrocarbons are found in lipids

Answer:

b they lose kinetic energy

Explanation:

when an object is cold the slower the kinetic energy

The second hydroxylation of vitamin D occurs primarily in the kidneys.

Vitamin D undergoes a two-step hydroxylation process to become its active form, 1,25-dihydroxy vitamin D (calcitriol). The first hydroxylation occurs in the liver, where vitamin D is converted to 25-hydroxy vitamin D (calcidiol). This is the major circulating form of vitamin D in the bloodstream.

After the initial hydroxylation in the liver, the second hydroxylation takes place primarily in the kidneys. Here, the enzyme 1-alpha-hydroxylase acts on 25-hydroxy vitamin D, converting it into the biologically active form, 1,25-dihydroxy vitamin D (calcitriol). This active form of vitamin D plays a crucial role in regulating calcium and phosphate metabolism, bone health, and overall immune function.

It is worth noting that certain other tissues and organs, such as the skin, intestines, and immune cells, also possess the capability to carry out the second hydroxylation to a lesser extent. However, the kidneys are the primary site for this conversion, contributing to the majority of the circulating active vitamin D in the body.

Overall, the second hydroxylation of vitamin D primarily occurs in the kidneys, where 25-hydroxy vitamin D is converted to 1,25-dihydroxy vitamin D, the biologically active form of vitamin D.

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There are 38.92 grams of H3PO4 in 265 mL of a 1.50 M solution of H3PO4.

To solve this problem, we need to use the formula:

\(molarity = moles of solute / liters of solution\)

We can rearrange the formula to solve for moles of solute:

moles of solute = molarity x liters of solution

We are given the following information:

molarity = 1.50 M

liters of solution = 0.265 L (converted from 265 mL)

We can now calculate moles of H3PO4:

moles of H3PO4 = 1.50 M x 0.265 L = 0.3975 moles

Finally, we can convert moles to grams using the molar mass of H3PO4:

1 mole H3PO4 = 98 g H3PO4

0.3975 moles H3PO4 x 98 g H3PO4/mol = 38.92 g H3PO4

Therefore, there are 38.92 grams of H3PO4 in 265 mL of a 1.50 M solution of H3PO4.

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The molecular formula of the compound shown would be 2,2-dimethylbutane.

Hydrocarbons are organic compounds made up of only carbon and hydrogen atoms. The rules for naming hydrocarbons depend on the type of hydrocarbon.

For alkanes, which are saturated hydrocarbons, the name is based on the number of carbon atoms in the longest continuous chain, with the suffix "-ane" added.

For alkenes, which are unsaturated hydrocarbons with at least one carbon-carbon double bond, the suffix "-ene" is added to the parent chain name. Alkynes, which are unsaturated hydrocarbons with at least one carbon-carbon triple bond, are named with the suffix "-yne".

For branched hydrocarbons, the branches are named as substituents and numbered to indicate their position on the parent chain.

Thus, the name of the structure shown in the image is 2,2-dimethylbutane.

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Increasing the amount of time it takes for the egg drop device to stop would help protect the egg because it would decrease the force acting on the egg, according to the formula Force = Δ⍴ / Δt.

When the device comes to a stop, the change in momentum (Δ⍴) of the egg will be the same as the change in momentum of the device. If the device stops abruptly, the time interval (Δt) will be small, which means that the force acting on the egg will be larger (since Force = Δ⍴ / Δt). This large force could cause the egg to break.

On the other hand, if the device stops over a longer period of time, the time interval (Δt) will be larger, which means that the force acting on the egg will be smaller (since Force = Δ⍴ / Δt). This smaller force will be less likely to break the egg, making it more likely to survive the fall.

Therefore, increasing the amount of time it takes for the egg drop device to stop will help protect the egg by reducing the force acting on it and increasing the chances of a successful landing.

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Answer:

Explanation:

The density of water = 1 g/mL

Mass of water = 159.0 mL x 1 g/mL = 159.0 g

q = m x c x ΔT

7.84 kJ = 159.0 g x 4.184 J/g°C x ΔT

ΔT = 7.84 x 10^3 J / (159.0 g x 4.184 J/g°C)

ΔT = 11.8°C

Therefore, the temperature change is 11.9°C.

Answer:

2. reasoning

Explanation:

PLS GIVE BRAINLIEST

Answer:

I think it's B

Explanation:

apologies if I get this wrong

Answer:

The correct answer is B. The force of gravity.

Explanation:

Gravity affects all objects falling through the Earth's atmosphere. Gravity pulls down on a falling object.

( I got it on study Island as well )

A solution containing 6.10 grams of benzene dissolved in 42.0 grams of paradichlorobenzene will have a freezing point of 39.8 °C.

The freezing point of the solution can be calculated using the formula ΔT = Kf * molality, where ΔT is the freezing point depression, Kf is the freezing-point depression constant, and molality is the number of moles of solute per kilogram of solvent.

To calculate the molality, we need to determine the number of moles of benzene and paradichlorobenzene.

Moles of benzene = mass of benzene / molar mass of benzene = 6.10 g / 78.0 g/mol = 0.0782 mol

Moles of paradichlorobenzene = mass of paradichlorobenzene / molar mass of paradichlorobenzene = 42.0 g / 147.0 g/mol = 0.2857 mol

Now we can calculate the molality:

molality = moles of benzene / mass of paradichlorobenzene (in kg) = 0.0782 mol / 0.0420 kg = 1.861 mol/kg

Finally, we can calculate the freezing point depression:

ΔT = Kf * molality = 7.10 °C/m * 1.861 mol/kg = 13.2 °C

Therefore, the freezing point of the solution is 53 °C - 13.2 °C = 39.8 °C.

This is calculated by determining the moles of benzene and paradichlorobenzene, calculating the molality, and then using the freezing-point depression constant to find the change in temperature. The freezing point depression is subtracted from the freezing point of pure paradichlorobenzene to obtain the freezing point of the solution.

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The ions arranged in terms of increasing atomic radius from left to right are: Ca²⁺, Sr²⁺, Na⁺, K⁺, Rb⁺.

As we move from left to right across the periodic table, due to the increasing nuclear charge the number of protons in the nucleus increases, pulling the electrons closer to the center and decreasing the atomic radius. However, as you move down a group, the number of electron shells increases, which increases the distance between the nucleus and outermost electrons, increasing the atomic radius.

Cations (positively charged ions) have smaller radii than their corresponding neutral atoms due to the loss of electrons and increased effective nuclear charge. Ca²⁺, Sr²⁺ have a +2 charge and; K⁺, Rb⁺, and Na⁺ have a +1 charge. Higher charge leads to a smaller atomic radius.

Ca²⁺, Sr²⁺  are located in Group 2, while K⁺, Rb⁺, and Na⁺ are located in Group 1 of periodic table. Arrange the ions based on their positions in the periodic table and their charges.

Based on these factors, the correct order of ions in terms of increasing atomic radius is: Ca²⁺ (smallest), Sr²⁺, Na⁺, K⁺, and Rb⁺ (largest).

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Lithium and cadmium are in the mixture. Strontium is not in the mixture. Cadmium and strontium are in the mixture. Lithium is not in the mixture

When a star's core runs out of hydrogen, it starts to fuse helium to create increasingly heavier elements, like carbon and iron. The star either erupts into a supernova as its fuel runs out, releasing those elements into space, or it violently collapses, forming neutron stars as well as black holes.

For the first time, researchers have demonstrated that certain of the heavier elements of the periodic table are produced when combinations of neutron stars collide violently and erupt. Light elements like helium and hydrogen were created during in the big bang, and stars' cores use fusion to create elements up to iron.

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Answer:

do you mean DeF?

Explanation:

In alpha decay, the core loses two protons. In beta decay, the core either loses a proton or gains a proton.

In gamma decay, no adjustment of proton number happens, so the particle doesn't turn into an alternate component. Chemical reactions take place in radioactive decay.

The three fundamental forces in the nucleus—the "strong" force, the "weak" force, and the "electromagnetic" force—are the causes of alpha, beta, and gamma decay. In every one of the three cases, the outflow of radiation expands the core soundness, by changing its proton/neutron proportion.

The release of a helium nucleus, which consists of two protons and two neutrons, is known as alpha decay. The atomic number and total mass are both reduced by 2 as a result. A neutron decay into a proton, which gives off an electron, is known as beta decay. The atomic number is increased by one while the mass remains unchanged.

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After losing an electron from the atom the net charge on the atom is now +4.

An atom's atomic number, which is constant, is determined by the number of protons it contains. The atom in question possesses 22 protons, making it an atom with the atomic number 22.

Because there are now more protons (positive charges) than electrons (negative charges), when an atom loses an electron, it becomes positively charged. The atom once had 19 electrons, but after losing one, it now only possesses 18.

Subtracting the number of electrons from the number of protons yields the atom's net charge. The net charge in this instance is +4 (22 protons minus 18 electrons = +4).

The atom's net charge is now +4  

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Answer:

\({ \boxed{ \mathfrak{ \: answer : \: { \bf{v = f \lambda}} }}}\)

Answer:

17.38 meters per second

Explanation:

Speed is distance over time so 112.6 / 1.8 hours =62.5555555556 km per hour. TO find it in m/s just divide 62.5555555556 by 3.6 and that is approximately equal to 17.38 meters per second, or at least something close to it.

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Answer:

NaHCO₃

Explanation:

Sodium bicarbonate (baking soda) is a chemical compound with the formula NaHCO₃.

The great ocean conveyor belt is a model that describes how ocean currents circulate thermal energy around the Earth.

Thermal energy is a type of energy that is associated with an object's or system's temperature. It is the energy that is transferred between two systems or objects as a result of a temperature difference. Thermal energy can be transferred through three methods: conduction, convection, and radiation.

Conduction is the transfer of thermal energy through a material without the material itself moving. Convection is the movement of fluids such as air or water that transfers thermal energy. The transfer of thermal energy via electromagnetic waves, such as light or infrared radiation, is known as radiation.

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The pH scale ranges from 0 to 14, with values below 7 considered acidic, 7 being neutral, and values above 7 being alkaline. Hair and scalp have a slightly acidic pH, and using a pH-balanced shampoo helps maintain the natural balance.

The characteristic that identifies a pH-balanced shampoo is having a pH level close to the natural pH level of the hair and scalp, which is around 4.5 to 5.5. Therefore, a pH-balanced shampoo will have a pH level in the acidic to neutral range, typically between 4.5 and 5.5, to avoid causing damage or disrupting the natural pH balance of the hair and scalp.

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A pH-balanced shampoo should have a pH between 4.5 and 5.5, contain mild acids or bases, and help to keep the hair and scalp's natural pH level balanced.

A pH-balanced shampoo is important because it prevents the scalp from becoming too dry or too oily. It ensures that the hair cuticle is closed, reducing frizz and improving shine. Using a pH-balanced shampoo can also help maintain the effectiveness of other hair products.

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The mass of 6.022*10*23 atoms, molecules, or formula units make up one mole of a substance, which is known as the molar mass. This value is given in grams per mole.

The mass of a sample of a chemical compound divided by the quantity, or number of moles in the sample, measured in moles, is known as the molar mass of that compound. A substance's molar mass is a bulk characteristic rather than a molecular one.

Atomic masses:

Number of atoms:

S - 1; O - 4; H - 2;

Molar mass =  32.06 + (1.01 * 2) + (16 * 4)

                   = 98.08 g/mol

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