how do hydrogen fuel cells and fossil fuels produce energy?

Answer:

heat flows from the object that has more thermal more energy to the object with less thermal energy

1.  We can see here that energy is required to change the phase of matter. For example, energy is required to melt ice, vaporize water, and condense steam. The amount of energy required to change the phase of matter is called the latent heat.

Energy is a fundamental concept in physics and refers to the ability or capacity of a system to do work or produce a change.

2. The demonstration on the sample of water showed that water can exist in three phases: solid, liquid, and gas. The solid phase is ice, the liquid phase is water, and the gas phase is steam.

The demonstration started with ice at 0°C. As heat was added to the ice, the temperature of the ice increased. However, the ice did not melt until the temperature reached 0°C. This is because the energy from the heat was used to break the bonds between the water molecules in the ice. Once the bonds were broken, the ice melted and became water.

3. Completing the

Page 4:

Heating and cooling curves are graphical representations of how temperature changes during the process of heating or cooling a substance. They illustrate the relationship between temperature and the state of matter.

Both curves show:

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Answer: The red on is attracted to The north pole

Explanation:

These orbital configurations represent the arrangement of electrons within the different energy levels and subshells of the respective elements.

The orbital configurations of the given elements are as follows:

Helium: 1s² - Helium has two electrons that occupy the 1s orbital.

Nitrogen: 1s² 2s² 2p³ - Nitrogen has two electrons in the 1s orbital, two electrons in the 2s orbital, and three electrons in the 2p orbital (specifically, 2p³ indicates three electrons in the 2p subshell).

Silicon: 1s² 2s² 2p⁶ 3s² 3p² - Silicon has two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbital, two electrons in the 3s orbital, and two electrons in the 3p orbital (specifically, 3p² indicates two electrons in the 3p subshell).

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Answer:

Explanation:

Remember, matter can neither be created nor destroyed, so every atom of reactant the leftt side of the equation must be accounted for in the products on the right side of the equation. With  magnesium and hydrochloric acid we have:  Mg  +  2HCl   →  MgCl2  +  H2(g).  Magnesium is divalent, and so requires two chloride ions to form magnesium chloride.  Hydrogen gas is a diatomic molecule, so the reaction requires the product to be H2.  Going across the equation from left to right we have 1 atom of magnesium (accounted for on the right side of the equation), and on the left, 2 moles of hydrochloric acid; the two hydrogens represented on the left of the equation are accounted for on the right of the equation.  Likewise, the two chloride anions on the left of the equation are accounted for in the formation of MgCl2 on the right. When all the atoms are accounted for on both sides of the equation, we say the equation is "balanced".

False. The given statement The molal boiling-point and freezing-point constants are different for different solvents is wrong.

Depression at the Freezing Point. A solution's freezing point is lower than that of the pure solvent. This indicates that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.

The number of solute molecules dissolved in one kilogram of the solvent is known as the molality of the solution, and it is directly inversely related to the drop in freezing point.

The effect of adding a solute to a solvent affects a solution's freezing point in the opposite way that it affects its boiling point. The freezing point of a solution will be lower than that of a pure solvent. The temperature at which a liquid turns into a solid is known as the freezing point.

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The nonessential amino acid which uses glutamate as an intermediate in its synthesis in humans is the alanine. Alanine is a non-essential amino acid because it can be synthesized in the body by reusing amino groups from other amino acids through the process of transamination. 

Glutamate is a key amino acid that plays a crucial role in human metabolism, being involved in the biosynthesis of several amino acids including alanine. The synthesis of alanine from glutamate happens via transamination, a reaction that involves the transfer of the amino group of one molecule to another molecule that accepts it. The enzyme responsible for this reaction is called alanine transaminase or ALT and is found in the liver and muscle tissues. In the liver, the alanine that is produced can be released into the bloodstream and transported to other tissues where it can be used as a source of energy or for the synthesis of proteins.

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The nucleus of an atom is small compared to the size of the atom because of Rutherford's nuclear theory. Rutherford's nuclear theory states that most of the mass of an atom and all of its positive charge are contained in a small core called the nucleus.

This statement is consistent with the fact that the nucleus of an atom is small compared to the size of the atom. Rutherford's nuclear theory states that the nucleus of an atom is small compared to the size of the atom, and, therefore, the nucleus has a relatively low mass compared to the mass of an atom.

Rutherford's nuclear theory states that the nucleus is small but contains about half of the mass of an atom. The nuclear theory was discovered by Ernest Rutherford in 1911.

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when 5.20 × 10⁻³ moles of N₂O₅ gas completely reacts, 2.60 × 10⁻³ mol of NO₂ gas is formed.

What is Moles?

A mole is a unit of measurement of the quantity of a substance in the International System of Units. It is defined as exactly 6.02214076×10²³ particles, which can be atoms, molecules, ions or electrons.

To calculate the quantity of moles of NO₂ gas formed, we need to use the stoichiometric coefficients from the balanced reaction.

The balanced equation is:

2 N₂O₅(g) → 4 NO₂(g) + O₂(g)

According to the balanced equation, for every 2 moles of N₂O₅ that react, 4 moles of NO₂ are produced.

So, we can set up a ratio:

2 moles of N₂O₅ : 4 moles of NO₂

Now, we can use this ratio to calculate the moles of NO₂ gas formed when 5.20 × 10⁻³ mol of N₂O₅ gas reacts.

Given: Moles of N₂O₅ = 5.20 × 10⁻³ mol

Using the ratio:

4 moles of NO₂

------------------- = x moles of NO₂

2 moles of N₂O₅

x = (4/2) × (5.20 × 10⁻³) = 2.60 × 10⁻³ mol

Therefore, when 5.20 × 10⁻³ mol of N₂O₅ gas completely reacts, 2.60 × 10⁻³ mol of NO₂ gas is formed.

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Answer:

11.3m/s

Explanation:

Answer:

Energy decreases and wavelength gets longer.

Explanation:

The energy of a wave is given by :

[tex]E=hf[/tex]

Where

h is Planck's constant

f is the frequency of the wave

As frequency decreases, the energy of the wave also decreases and wavelength gets longer. Hence, the option is (d).  

Mendeleev arranged the elements in the periodic table on the basis of atomic masses and stated the behavior of the elements in a periodic law. The periodic law is when elements arranged by the atomic masses they exhibit the presence of similar properties. Mendeleev focused on the chemical properties of the elements and Meyer focused on the physical properties of the elements. The change in the periodic table is that the elements are now arranged in the order of their atomic numbers instead of their atomic masses.

Answer:

6........................

After considering the given data and statements we conclude that the correct option is A , Only one of the statements is true.

The statement that is true for a solution at 25 °C with pOH = 10.53 is:
iii) For this solution, [tex][OH^-] = 10^{(-10.53)} M.[/tex]
Statement i) is false due to the fact that a solution with a pOH greater than 7 is basic, not acidic.
Statement ii) is false due to  the pH of the solution can be evaluated from pOH using the equation [tex]pH + pOH = 14[/tex], not by subtracting pOH from 14. Therefore, the pH of the solution is 14 - 10.53 = 3.47, which is acidic.
Statement iii) is true due to the concentration of hydroxide ions [tex]([OH^-])[/tex] can be calculated from pOH using the equation[tex][OH^-] = 10^{(-pOH)}[/tex]. Therefore, [tex][OH^-] = 10^{(-10.53)} M.[/tex]
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If the oxidation of glucose 6-phosphate via the pentose phosphate pathway were being used primarily to generate NADPH for biosynthesis, the other product, ribose 5-phosphate would accumulate. The accumulation of ribose 5-phosphate would lead to a problem, i.e. it would quickly deplete NADPH in the cell.

This is because ribose 5-phosphate is produced in the first step of the pentose phosphate pathway, and if it is not utilized in the next step, it will accumulate. This accumulation of ribose 5-phosphate will have a detrimental effect on the cell's metabolic pathways. In this case, the ribose 5-phosphate will compete with NADP+ as an electron acceptor. Since NADPH is required for the synthesis of fatty acids, nucleotides, and other essential biomolecules, its depletion will lead to an insufficient supply of these biomolecules. Therefore, the accumulation of ribose 5-phosphate will impair the biosynthetic processes that require NADPH.

Thus, it is essential to balance the pentose phosphate pathway to maintain the cellular redox balance, which is necessary for the normal functioning of the cell.

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Explanation:

1. If you measure the value of Hydronium concentration is 3.0x10-3 M/L, the solution can be predicted to be acidic. This is because the concentration of hydronium ions, H3O+, is greater than the concentration of hydroxide ions, OH-. The pH value of an acidic solution is less than 7. Since hydronium ions are present in a high concentration, the pH value of the solution will be less than 7.

2. If you measure the number of Hydronium ions is 3.0x1012, the solution can be predicted to be acidic. This is because the concentration of hydronium ions is greater than 1.0 x 10^-7 M/L. The pH value of an acidic solution is less than 7.

3. If you measure the number of Hydroxide ions is 3.0x10-2 moles, the solution can be predicted to be basic. This is because the concentration of hydroxide ions is greater than 1.0 x 10^-7 M/L. The pH value of a basic solution is greater than 7. Hence, if the number of hydroxide ions is greater than 1.0 x 10^-7 M/L, the solution will be basic.

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Answer: When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase.

Explanation:

Answer:

1.67 × 10^9

Explanation:

The value of the double integral ∬(3x - y) dA, where the region R is in the first quadrant enclosed by the circle x² + y² = 9, the line x = 0, and the line y = x, using the transformation to polar coordinates, is 27/4√2.

To evaluate the double integral, we can switch to polar coordinates. In polar coordinates, the variables x and y are expressed in terms of r (radius) and θ (angle).

The region R, which is enclosed by the circle x² + y² = 9, can be expressed in polar coordinates as 0 ≤ r ≤ 3 and 0 ≤ θ ≤ π/4. This represents the first quadrant portion of the circle.

The Jacobian of the transformation from Cartesian to polar coordinates is r (the absolute value of the determinant of the Jacobian matrix). So, dA in polar coordinates is equal to r dr dθ.

Now, we can express the integral in terms of polar coordinates:

∬(3x - y) dA = ∫∫(3r cos θ - r sin θ) r dr dθ

Next, we need to set up the limits of integration. Since the region R is bounded by x = 0, y = x, and the circle x² + y² = 9, we can set up the limits as follows:

0 ≤ θ ≤ π/4 (corresponding to the angle that spans the first quadrant)

0 ≤ r ≤ 3 (corresponding to the radius of the circle)

Now, we can evaluate the integral:

∫[0,π/4] ∫[0,3] (3r cos θ - r sin θ) r dr dθ

By integrating with respect to r first, we get:

∫[0,π/4] [(3/4) r³ cos θ - (1/2) r³ sin θ] |[0,3] dθ

Simplifying further, we obtain:

∫[0,π/4] [(27/4) cos θ - (27/2) sin θ] dθ

Finally, we integrate with respect to θ:

[27/4 sin θ + (27/2) cos θ] |[0,π/4]

Plugging in the limits of integration, we have:

(27/4 sin(π/4) + (27/2) cos(π/4)) - (27/4 sin(0) + (27/2) cos(0))

Evaluating the trigonometric functions at the respective angles, we find:

(27/4 (1/√2) + (27/2) (1/√2)) - (27/4 (0) + (27/2) (1))

Simplifying further, we get the final result:

(27/4√2 + 27/2√2) - (0 + 27/2) = (27/4√2 + 27/2√2) - 27/2 = 27/4√2

Therefore, the value of the double integral ∬(3x - y) dA over the region R, using the transformation to polar coordinates, is 27/4√2.

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Answer:

a

Explanation:

A balanced chemical equation shows reacting ratios of all substances involved in reaction in terms of grams which is important while solving stoichiometry problems.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

50?

I think but not 100% sure if not lmk

Answer: 120 g

Explanation:

To calculate the enthalpy of the reaction, c. The second equation must be halved, d. The second equation must be reversed. and e. The third equation must be halved.

The enthalpy of the reaction is the sum of internal energy in a  system, in this case of the total energy of the reaction  under constant conditions.

Therefore, with this data, we can see that the enthalpy of the reaction is the sum of energy, which obeys a series of laws such as described above.

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At a particular temperature, the solubility of H2 in water is 0.0200 M when the partial pressure is 0.0900 atm. To determine the solubility (in M) when the partial pressure of H2 is 1.54 atm, we can use Henry's law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas. By applying this law, we can set up a proportion to find the solubility at the given partial pressure.

According to Henry's law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas. Mathematically, this can be expressed as:

Solubility = k * Partial pressure

Here, k represents the proportionality constant.

Using the given information, we have the solubility of H2 as 0.0200 M when the partial pressure is 0.0900 atm. Let's assume k as the proportionality constant. We can set up a proportion using the solubility and partial pressure values:

0.0200 M / 0.0900 atm = k * (1.54 atm)

Solving for k, we find:

k = (0.0200 M / 0.0900 atm) / (1.54 atm) = 0.0143 M/atm

Now, we can use the proportionality constant to determine the solubility at the given partial pressure of 1.54 atm:

Solubility = k * Partial pressure = 0.0143 M/atm * 1.54 atm = 0.022 M

Therefore, the solubility of H2 in water will be approximately 0.022 M when the partial pressure of H2 is 1.54 atm.

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