Consider melting ice cream. When it melts, it takes heat away from the environment and so the reaction is endothermic. When you freeze ice cream, the heat is being removed from what?

the answer is A and C

To provide 0.252 moles of chloride ions, one would need 13.98428 grams of [tex]CaCl_2[/tex], using its molar mass of 110.98 g/mol and factoring in that each mole of [tex]CaCl_2[/tex] contains two moles of chloride ions.

To find out how many grams of calcium chloride ([tex]CaCl_2[/tex]) must be used to provide 0.252 moles of chloride ions, consider that each mole of [tex]CaCl_2[/tex] contains two moles of chloride ions. The molar mass of [tex]CaCl_2[/tex] is 110.98 g/mol.

To get the total number of moles of [tex]CaCl_2[/tex] needed, halve the number of chloride ions, which is [tex]\frac{0.252 moles}{2} = 0.126 moles[/tex] [tex]CaCl_2[/tex]. Then, use the molar mass to convert moles to grams:

0.126 moles [tex]CaCl_2[/tex] x 110.98 g/mol = 13.98428 grams of [tex]CaCl_2[/tex]

Therefore, you would need 13.98428 grams of [tex]CaCl_2[/tex] to provide 0.252 moles of chloride ions.

The balanced equation for the reverse reaction would be

[tex]2SO_3 (g) < ----- > 2SO_2 (g) + O_2 (g)[/tex]

They are reactions that proceed in opposing directions - that is, reactants to products and vice versa.

The equilibrium system between sulfur dioxide gas, oxygen gas, and sulfur trioxide gas can be represented as:

[tex]2SO_2 (g) + O_2 (g) < --- > 2SO_3 (g)[/tex]

Thus, the reverse reaction would be:

[tex]2SO_3 (g) < ----- > 2SO_2 (g) + O_2 (g)[/tex]

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The equilibrium system between sulfur dioxide gas, oxygen gas, and sulfur trioxide gas is given. Write the balanced chemical equation for the reverse reaction. Include physical states for all species.

Answer : The mass of phosphoric acid produced is 6.89 grams.

Solution : Given,

Mass of [tex]P_4O_{10}[/tex] = 10.0 g

Molar mass of [tex]P_4O_{10}[/tex] = 284 g/mole

Molar mass of [tex]H_3PO_4[/tex] = 98.0 g/mole

First we have to calculate the moles of [tex]P_4O_{10}[/tex].

[tex]\text{ Moles of }P_4O_{10}=\frac{\text{ Mass of }P_4O_{10}}{\text{ Molar mass of }P_4O_{10}}=\frac{10.0g}{284g/mole}=0.0352moles[/tex]

Now we have to calculate the moles of [tex]MgO[/tex]

The balanced chemical reaction is,

[tex]P_4O_{10}+6H_2O\rightarrow 4H_3PO_4[/tex]

From the reaction, we conclude that

As, 1 mole of [tex]P_4O_{10}[/tex] react to give 2 mole of [tex]H_3PO_4[/tex]

So, 0.0352 moles of [tex]P_4O_{10}[/tex] react to give [tex]0.0352\times 2=0.0704[/tex] moles of [tex]H_3PO_4[/tex]

Now we have to calculate the mass of [tex]H_3PO_4[/tex]

[tex]\text{ Mass of }H_3PO_4=\text{ Moles of }H_3PO_4\times \text{ Molar mass of }H_3PO_4[/tex]

[tex]\text{ Mass of }H_3PO_4=(0.0704moles)\times (98.0g/mole)=6.89g[/tex]

Therefore, the mass of phosphoric acid produced is 6.89 grams.

The total number of valence electrons in the Lewis structure of SEF2O is calculated by adding the valence electrons of each atom, giving us a total of 26 electrons.

The total number of valence electrons in the lewis structure of SEF2O can be calculated by adding up the valence electrons in each atom. Selenium (Se) has 6 valence electrons, each Fluorine (F) has 7 (so that's 14 for 2 Fluorines), and Oxygen (O) also has 6. So, the total number of valence electrons in SEF2O is 24+2 = 26.

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The total number of valence electrons in the Lewis structure of SeF2O is 26.

The Lewis structure of SeF2O consists of a central Se atom bonded to two F atoms and one O atom. To determine the total number of valence electrons, we need to add up the valence electrons of each particle. She has six valence electrons, each F atom has seven valence electrons, and O has six valence electrons. Therefore, the total number of valence electrons in the Lewis structure of SeF2O is 6 (Se) + 2(7) (F) + 6 (O) = 26.

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Answer:

Displacement

Explanation:

The answer is: Waves interact with objects and other waves.

There are many types of waves, with different energy and interactions witt.

In order from highest to lowest energy: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

For example, ultraviolet wave is a type of electromagnetic radiation.

Ultraviolet has shorter waves and higher energy than violet, it lies between visible light and X-rays on the electromagnetic spectrum.

Ultraviolet radiation oscillates at rates between about 800 terahertz (THz) and 30000 THz.

To effectively stop both beta particles and gamma waves, scientists use a chamber composed of lead (Pb).

Answer:

objects and waves

Explanation:

C. Lone elements and atoms in gases : 0

Elements in the free elemental have an oxidation number of zero

E. Elements in groups 1, 2, and 17 and polyatomic ions : Ionic charge

Group 1, 2, and 17 ions are formed by the alkali metals, alkaline metals and halogens respectively. Alkali metals, alkaline metals and halogens form +1, +2 and -1  ions respectively. Polyatiomic ions have -1, -2, -3 charges such as OH-, CO32-, PO43- respectively.

B. Hydrogen : +1, – 1 if bonded to a diatomic metal

H has an oxidation number of +1. H in metal hydrides such as NaH (sodium hydride) has an oxidation number of -1

A. Oxygen : Almost always –2  

O has an oxidation number of -2.

D. Elements with multiple oxidation states : Determined by other elements in the compound

V (vanadium) has different oxidation which depends on the compound in which V is found.

look at the thing attached

The pressure of 0.840 atmospheres (atm) can be converted to millimeters of mercury (mm Hg) by using the conversion factor, 1 atm = 760 mm Hg. The result of this conversion is 638.4 mm Hg.

To convert the pressure from atmospheres (atm) to millimeters of mercury (mm Hg), we use the conversion factor of 1 atm = 760 mm Hg. This is a known standard in chemistry and physics. In this case, the conversion will be as follows:

0.840 atm x 760 mm Hg/1 atm = 638.4 mm Hg

Therefore, 0.840 atm is equivalent to 638.4 mm Hg.

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In the Wittig reaction to synthesize 2-methyl-2-pentene, a phosphonium ylide and a carbonyl-containing molecule, such as an aldehyde or a ketone, are needed as reactants.

The reactants needed for the Wittig reaction to synthesize 2-methyl-2-pentene are a phosphonium ylide and a carbonyl-containing molecule. In this case, the carbonyl-containing molecule should be an aldehyde or a ketone. The phosphonium ylide is usually generated from a phosphine and an alkyl halide. For example, one possible combination of reactants could be triphenylphosphine and methyl iodide to form the phosphonium ylide, which can then react with an aldehyde or ketone to produce 2-methyl-2-pentene.

Based on the Kf value and mass of the solvent naphthalene, the molar mass of the unknown compound is 154.58 g/mol.

The molar mass of a substance is the mass of one mole of that substance.

The molar mass of a substance can be calculated from the Kf value and mass of the solvent naphthalene as follows:

mass of naphthalene = 10 g or 0.01 kg.

mass of unknown compound = 1.00 g

ΔT of the solution = 4,47 °C.

Kf value of naphthalene = 6.91°C/m;

Molar mass of the unknown compound = 6.91°C/m · 1 g ÷ 0.01 kg × 4,47°C.

Molar mass of the unknown compound = 154.58 g/mol.

Therefore, the molar mass of the unknown compound is 154.58 g/mol.

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Final answer:

pressure of 34.19 atmospheres.

Explanation:

To find the pressure in atmospheres of 1360.0g of N2O gas compressed in a 25.0L cylinder at 59.0°C, use the Ideal Gas Law PV = nRT, where:

First, calculate the moles of N2O:

Molecular mass of N2O = (14.0×2) + 16.0 = 44.0g/mol

Moles of N2O = 1360.0g / 44.0g/mol = 30.91mol

Then, substitute the values into the Ideal Gas Law and solve for P:

P = (nRT)/V = (30.91mol × 0.0821 L·atm/K·mol × 332.15 K) / 25.0L = 34.19 atm

Answer: Option (a) is the correct answer.

Explanation:

Molar mass is defined as the mass in grams of one mole of a substance.

Mathematically,       Molar mass = [tex]\frac{mass in grams}{moles of substance}[/tex]

For example, molar mass of 1 mole of [tex]CH_{4}[/tex] molecule will be calculated as follows.

             Molar mass of [tex]CH_{4}[/tex] = [tex]mass of carbon atom + 4 \times mass of hydrogen atom[/tex]

                                 = [tex]12 + 4 \times 1[/tex]

                                 = 16 g

Therefore, 1 mole of [tex]CH_{4}[/tex] molecules has a molar mass of 16 g.

The concentration of the reactant PCl5 at equilibrium can be found using the given equilibrium concentrations of the products and the equilibrium constant by rearranging the equilibrium expression and substituting the known values.

To determine the concentration of the reactant PCl5 at equilibrium, we use the equilibrium constant Ke for the reaction, which is given as 0.0211. Let's set up the equilibrium expression for this decomposition reaction:

PCl5 → PCl3 + Cl2

The equilibrium constant expression is:

Ke = [PCl3][Cl2] / [PCl5]

We can rearrange this equation to solve for [PCl5]:

[PCl5] = [PCl3][Cl2] / Ke

We substitute the given concentrations [PCl3] = 0.180 M and [Cl2] = 0.250 M into the equation:

[PCl5] = (0.180 M)(0.250 M) / 0.0211

By calculating the above equation, we find the concentration of PCl5 at equilibrium.

The energy due to the random motion of water molecules in a tank is thermal energy, which is related to the temperature of the water and can be transferred as heat.

The form of energy that water has due to the random motion of its molecules is called thermal energy. This energy arises from the kinetic energy that is present in the random microscopic motions of the water molecules. When these molecules move, collide, and bounce off each other, the average kinetic energy of these motions correlates with the temperature of the water. Furthermore, thermal energy can be transferred between objects or systems through processes like conduction, convection, and radiation, at which point it is commonly referred to as heat energy.

Answer: 2.01

Explanation:

[tex]C_6H_5COOH\rightleftharpoons C_6H_5COO^-+H^+[/tex]

initial : c         0             0

eqm: [tex]c(1-\alpha)[/tex]     [tex]c\alpha[/tex]      [tex]c\alpha[/tex]  

[tex]K_a=\frac{c\alpha\times c\alpha}{c(1-\alpha)}[/tex]

when [tex]\alpha[/tex] is very very small the, the expression will be,

[tex]k_a=\frac{c^2\alpha^2}{c}=c\alpha^2\\\\\alpha=\sqrt{\frac{k_a}{c}}[/tex]

And,

[tex][H^+]=c\alpha[/tex]

Thus the expression will be,

[tex][H^+]=\sqrt{k_a\times c}[/tex]

Now put all the given values in this expression, we get

[tex][H^+]=\sqrt{(6.4\times 10^{-5})\times 1.5}[/tex]

[tex][H^+]=9.7\times 10^{-3}M[/tex]

[tex]pH=-log[H^+][/tex]

[tex]pH=-log[9.7\times 10^{-3}]=2.01[/tex]

Plants, the ocean, and soil serve as the primary natural carbon sinks. A portion of the carbon dioxide that plants absorb from the environment to use in photosynthesis is transferred to the soil as plants disintegrate and die.

Anything—natural or artificial—that gathers and stores a carbon-containing chemical compound over an extended period of time eliminates carbon dioxide from the atmosphere.

The ocean and vegetation are the two most significant carbon sinks on a global scale.

Typically, forests act as carbon sinks, absorbing more carbon than they emit. Through photosynthesis, they remove carbon from the atmosphere on a constant basis.

Another example of a carbon sink is the ocean, which takes in a lot of carbon dioxide from the atmosphere.

Therefore, the ocean, plants, and soil serve as the primary natural carbon sinks.

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