which of the following situations violates the law of conservation of energy?
A. a ball dropped from the top of a building in speed until it hits ground
B. a block sliding freely on level ice increases in speed until it hits a wall
C. A child playing on a swing moves fastest at the bottom of the swing's path
D. The height a ball bounces decreases with each bounce​

Answer:

oxygen is an element because it is a pure substance which cannot be split into simpler substances by chemical means

Answer:There are 1.51 × 1024 atoms

Explanation:

At the summit of Mount Everest, the boiling temperature of water C. would decrease (<100 ∘C).

The lower atmospheric pressure means that the pressure on the surface of the water is reduced, requiring less energy for the water molecules to escape as vapor. Consequently, the boiling point of water decreases to a temperature below 100 °C (212 °F).

At the summit of Mount Everest, the boiling point of water is approximately 68 °C (154 °F).

Therefore, if you were to bring water to a boil on the summit of Mount Everest, it would start to boil at a lower temperature compared to sea level due to the reduced atmospheric pressure.

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Cis- and trans-2-butene can both be hydrogenated to butane; thus their energies can be compared. the trans isomer releases less energy upon hydrogenation therefore cis-2-butene higher in energy.

The process of addition of hydrogen atom to another compound in the presence of catalyst such as nickel, cobalt etc. is termed as hydrogenation process.

As in trans- isomer, similar atoms or group of atoms are on opposite side. Due to which there is less repulsion between the atoms which results in more stability of trans isomer. On the other hand in cis- isomer, similar atoms or group of atoms are on same side, due to which there is more repulsion between the atoms which results in less stability of cis-isomer.

Due to more stability of trans- isomer less energy is released to add hydrogen to the trans butene as compared to cis butene for the formation of butane.

Thus we concluded that the trans isomer releases less energy than cis isomer in hydrogenation process.

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The influence of two solvents, water and hexane, on the pKa of acetic acid can be explained as follows:


1. Water has a high dielectric constant, while hexane has a low dielectric constant. The dielectric constant of a solvent affects the strength of the electrostatic interaction between charged species. In water, the electrostatic interaction between the negatively charged carboxylic acid group and the proton is stronger, resulting in a lower pKa for acetic acid.

2. In hexane, which has a low dielectric constant, the electrostatic interaction between the carboxylic acid group and the proton is weaker. As a result, the pKa for acetic acid is higher in hexane compared to water.

In summary, the pKa of acetic acid is lower in water due to the stronger electrostatic interaction between the carboxylic acid group and the proton, which is influenced by the high dielectric constant of water. Conversely, the pKa is higher in hexane due to the weaker electrostatic interaction caused by the low dielectric constant of hexane.

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Answer:

The answer is D.

Explanation:

Including soluble fiber into your diet can lower cholesterol levels.

Hydrogen could be used as a fuel source in the future because it is abundant and can be used as fuel and is using fuel-cell . Hence Option D. all of the above is correct.

The answer to your question is d. all of the above. Hydrogen is abundant in the universe and can be used as a fuel source. It can also be used in fuel cells to generate electricity, making it a versatile and potentially sustainable energy source for the future.
Hydrogen could be used as a fuel source in the future because of all the reasons mentioned (d. all of the above). It is abundant, can be used as fuel, and is used in fuel-cell technology.

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The value of the mixture constant, a, is 17.381 kPa(m³/kmol)²K¹/².

The mixture constant, a, of a mixture of 40% nitrogen, 35% oxygen, and 25% carbon dioxide on a molar basis, in the equation P = RTa.0(0+b)T, is 17.381 kPa(m³/kmol)²K¹/².

Solution:

Percentages of nitrogen, oxygen and carbon dioxide in the mixture on a molar basis are 40%, 35% and 25% respectively. Therefore, the mole fractions of N₂, O₂ and CO₂ in the mixture are as follows:

x(N₂) = 0.4, x(O₂) = 0.35, x(CO₂) = 0.25

Now, the mixture constant a can be obtained by using the following formula:

For a binary mixture of gases, a is calculated using the formula:

a = [∑(xᵢaᵢ)²]⁰⁵, where i = 1, 2 ... n and n is the number of components of the mixture

Here, the mixture contains three components, N₂, O₂ and CO₂.

So, applying the above formula gives:

a = [x(N₂)²a(N₂) + x(O₂)²a(O₂) + x(CO₂)²a(CO₂) + 2x(N₂)x(O₂)√(a(N₂)a(O₂)) + 2x(N₂)x(CO₂)√(a(N₂)a(CO₂)) + 2x(O₂)x(CO₂)√(a(O₂)a(CO₂))]⁰⁵

Now, for nitrogen, oxygen and carbon dioxide, the values of a at standard temperature and pressure (STP) are given by:

a(N₂) = 1.39 kPa(m³/kmol)²K¹/²a(O₂) = 1.36 kPa(m³/kmol)²K¹/²a(CO₂) = 0.187 kPa(m³/kmol)²K¹/²

Therefore, substituting these values in the above expression gives:

\(a = [0.4^2 \times 1.39 + 0.35^2\times 1.36 + 0.25^2 \times 0.187 + 2 \times 0.4\times 0.35 \times \sqrt{(1.39 \times 1.36)} + 2 \times 0.4 \times0.25 \times\sqrt{(1.39 \times 0.187)} + 2 \times 0.35 \times 0.25\times \sqrt{(1.36 \times 0.187)]^{05}}\\= [0.193606 + 0.16574 + 0.00435 + 2 \times 0.4 \times 0.35 \times 1.16289 + 2 \times 0.4 \times 0.25\times 0.54031 + 2 \times 0.35 \times 0.25 \times 0.22733]^{{05}}\\= (2.337485)^{05}\\= 17.381\) kPa(m³/kmol)²K¹/²

Hence, the value of the mixture constant, a, is 17.381 kPa(m³/kmol)²K¹/².

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Answer:

Substances 1 and 2

Explanation:

an element only has 1 kind of atoms :3

The element that we can be able to use for the experiment in place of potassium is sodium.

We know that the elements that can be found in the same group does react in the same way. Now we know that we have to look about among the options so that we would be able to know element that is in the same group as potassium.

Given that both sodium and potassium are members of group 1, we have to look out for the element that element thus we have to select sodium.

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Answer:

No because it's located inside the nucleus of the atom

hope this helps

have a good day :)

Explanation:

Answer:

Below is the clarification of that same particular question.

Explanation:

For that kind of weak diprotic predictor, the standard economic statement can indeed be published as:

    ⇒  \(H_2In_(aq)\rightleftharpoons In^{2-} +2H^+\)

Answer:

The specific heat of Barium is 0.204 J/g K

Step 1 - Understanding the law of mass conservation

In physics, chemistry and biology the law of mass conservation states that no atom is created or destroyed, they are only rearranged in any given physical/chemical/biological process.

Therefore, if all atoms are preserved, the total mass of reactants and products is the same.

Step 2 - Answering the exercise

The melting of an ice cube is a physical process and, as such, is also subjected to the law of mass conservation. Therefore, if 10g of ice melt, 10g of water are produced.

Answer: 10.0g

Answer: D. negative

Explanation:

As, the chemicals are toxic, they have adverse effects in our life.

A compound or element which reacts with the other element to form a product.

Chemicals are generally toxic because they harm our skin, when they come in contact with the body. When exposed to a toxic substance,  gasoline can affect your health. Since, drinking gasoline can cause burns, vomiting, diarrhea and can cause death,

Thus, the chemicals are toxic.

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When determining the standard reduction potential of a substance by using a standard hydrogen electrode as a reference, the standard reduction potential will always be equal to overall cell potential.

The overall cell potential is the reduction potential of the substance being determined using the standard hydrogen electrode as a reference electrode since its electrode potential is set at zero volts.

What do you mean by overall cell potential?
The driving force of the electron flow from anode to cathode shows a potential drop in the energy of the electrons moving into the wire. The difference in potential energy between the anode and cathode is known as the cell potential in a voltaic cell.

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The standard reduction potential will always be equal to overall cell potential.

What is potential?

Potential is the capacity to become or develop into something in the future. It is the latent ability or capacity to achieve something great, or to realize a desirable outcome. Potential is the ability to produce a result, or to manifest something of value. It is associated with the idea of potentiality, which is the capacity to achieve something or to be something. Potential can refer to a wide range of situations, from physical and mental abilities to creative and professional potential. Potential is a concept that is often used to motivate people and challenge them to reach their highest level of performance. It can also be used to describe the potential of a given situation or environment, such as the potential of a business opportunity or a promising career path. Potential is an essential factor in personal development and growth, and it can be developed and nurtured over time.

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Answer:

A is the answer

Explanation:

Just guessing.

The average rate of the reaction over the first 450 seconds -2.2×10⁻³ M/s

Speed is defined as the rate of change of the distance moved with time. Mathematically, it can be expressed as:

Speed = distance / time

With the above idea, we can obtain the rate of the reaction as illustrated below:

Rate = Change in concentration / time

Rate = -1 / 450

Rate = -2.2×10⁻³ M/s

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D is correct for number 2. i just finished

explanation; i got it right

Explanation:

The forms of thermal energy transfer are;

Thermal energy is a form of kinetic energy that causes the particles of a medium to begin to move.

Explanation:

a) 0.4998 mol

b) 0.249 mol

The correct answer is (a) ne < f2 < nai. Solubility refers to the ability of a substance (solvent) to dissolve another substance (solute) to form a homogenous mixture.

The correct answer is (a) ne < f2 < nai. Solubility refers to the ability of a substance (solvent) to dissolve another substance (solute) to form a homogenous mixture. In this case, water is the solvent and ne, f2, and nai are the solutes. When comparing the solubility of these substances in water, we need to consider their molecular structure and polarity. Ne (neon) is a noble gas that exists as a monoatomic molecule, meaning it has no polarity and cannot form hydrogen bonds with water molecules, making it the least soluble among the three. F2 (fluorine) is a diatomic molecule that is highly electronegative and polar, allowing it to form hydrogen bonds with water molecules, making it more soluble than neon. Nai (sodium iodide) is an ionic compound that dissociates in water to form Na+ and I- ions, which are highly polar and interact strongly with water molecules, making it the most soluble among the three. Therefore, the correct order of increasing solubility in water is ne < f2 < nai.

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A nail made from the metal iron.

Answer:

k+

Ba2+

Al3+

K+

S2-

you may think that if it has a + it would be bigger, but it is actually the opposite.

Two isomers of C₃H₆O₂ - The first isomer has a linear structure with a double bond between a carbon atom and an oxygen atom. The second isomer has a chain structure with a double bond between two adjacent carbon atoms and an oxygen atom at one end of the chain.

To draw Lewis structures for two different isomers with the molecular formula C₃H₆O₂, we first need to determine the total number of valence electrons. Carbon (C) has 4 valence electrons, hydrogen (H) has 1 valence electron, and oxygen (O) has 6 valence electrons.

For the first isomer, we can start by placing the carbon atoms in the center, since it is the least electronegative element. Each carbon atom is connected to two hydrogen atoms and one oxygen atom. The oxygen atom is connected to one carbon atom and one hydrogen atom. This arrangement would give us a linear structure with the oxygen atom in the middle. To ensure that each atom has a full octet of electrons, we will need to add double bonds. By adding a double bond between one carbon atom and the oxygen atom, we can complete the octet for all atoms. The final structure will have a formal charge of zero for each atom.

For the second isomer, we can start by placing the carbon atoms in a chain. Each carbon atom is connected to two hydrogen atoms. We can then place the oxygen atom at one end of the chain. The oxygen atom is connected to one carbon atom and one hydrogen atom. Again, to ensure that each atom has a full octet of electrons, we will need to add double bonds. By adding a double bond between the carbon atom connected to the oxygen atom and the adjacent carbon atom, we can complete the octet for all atoms. The final structure will have a formal charge of zero for each atom.

In summary, for the molecular formula C₃H₆O₂ - The first isomer has a linear structure with a double bond between one carbon atom and an oxygen atom. The second isomer has a chain structure with a double bond between two adjacent carbon atoms and an oxygen atom connected to one end of the chain.

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The atomic number is 4.

The atomic number of the given atom is equal to 4.

The atomic number (symbol Z) of a chemical element can be defined as the charge number of an atomic nucleus. For an ordinary atom, the atomic number is equal to the number of protons found in the nucleus of an atom of that element.

The atomic number helps to uniquely identify ordinary chemical elements. In an ordinary uncharged atom or neutral atom, the atomic number of that atom is also equal to the number of electrons.

For a neutral atom, the sum of the atomic number and the neutron number gives the atomic mass. The protons and neutrons have approximately the same mass. Atoms that have the same atomic number but different numbers of neutrons or different mass numbers are known as isotopes.

Given the number of electrons in the atom is 4. Therefore, the atomic number of that atom will be equal to 4.

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The coenzyme found in pyruvate carboxylase that aids in many carboxylation reactions is biotin.

Biotin is a water-soluble B vitamin that acts as a coenzyme in many carboxylation reactions. In pyruvate carboxylase, biotin serves as a carrier of CO2, which is then transferred to pyruvate to form oxaloacetate. This reaction is an important step in gluconeogenesis, the process by which the body produces glucose from non-carbohydrate sources. Biotin is also involved in other carboxylation reactions in the body, such as fatty acid synthesis and amino acid metabolism.

Biotin is the coenzyme found in pyruvate carboxylase that aids in many carboxylation reactions. It plays a crucial role in the conversion of pyruvate to oxaloacetate by acting as a carrier of activated carbon dioxide during the carboxylation process.

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