true/false. calcium carbonate is 100 times less soluble in cold water than ca(oh)2

The houses of compounds are one-of-a-kind and in a few instances very one-of-a-kind, from the ones of the factors that compose them. This is because Elements combine compounds to grow to be absolutely one-of-a-kind materials with specific houses.

Elements combine may be chemically blended into compounds, therefore, a compound includes extra factors blended, in exact proportions, with the aid of using chemical means. Compounds can be shaped with the aid of using combining atoms in their constituent factors with the aid of using ionic bonds or with the aid of using covalent bonds.

An Elements compound is a completely unique substance that paperwork while or extra factors integrate chemically. A compound usually includes the identical factors withinside the identical ratio. If the identical factors integrate into one-of-a-kind ratios, they shape one-of-a-kind compounds. Types of compounds encompass covalent and ionic compounds.

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The partial pressure (P) Xe = 203 mm Hg & (P) He = 648 mm Hg

According to Dalton's Law of partial pressure , Partial pressure of gas in mixture = X gas ( P total )

Where X gas is mole fraction of gas.

First calculate no. of moles & mole fraction of each gas.

We know that , No. of moles = Mass / Molar mass

therefore No. of moles of Xe ( n Xe ) = 9.81 g / ( 131.30 g /mol ) = 0.074 mol

therefore No. of moles of He ( n He ) = 0.946 g / ( 4.00 g / mol ) = 0.2365 mol

Mole fraction of Xe = Moles of Xe / Total moles of gas = n Xe / ( n Xe + n He )

therefore Mole fraction of Xe = 0.074 / ( 0.074 + 0.2365 ) = 0.2383

Mole Fraction of He = n He / ( n Xe + n He )

therefore Mole fraction of He = 0.2365 / ( 0.074 + 0.2365 ) = 0.7616

Partial pressure of Xe = 0.238 ( 851 mm Hg ) = 203 mm Hg

Partial pressure of He = 0.761 ( 851 mm Hg ) = 648 mm Hg

ANSWER : P Xe = 203 mm Hg & P He = 648 mm Hg

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39.17 ml of the 15.0 M HF stock solution is required to prepare 250.0 ml of a 2.35 M HF solution.

To prepare 250.0 ml of a 2.35 M HF solution from a 15.0 M HF stock solution, we can use the formula M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
In this case, we are looking for V1, the volume of the stock solution required.
M1 = 15.0 M
V1 = ?
M2 = 2.35 M
V2 = 250.0 ml
Plugging the values into the formula, we get:
15.0 M x V1 = 2.35 M x 250.0 ml
Solving for V1, we get:
V1 = (2.35 M x 250.0 ml) / 15.0 M
V1 = 39.17 ml
Therefore, 39.17 ml of the 15.0 M HF stock solution is required to prepare 250.0 ml of a 2.35 M HF solution.

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Answer:

406m/s

Explanation:

Speed = distance ÷ time

Answer:

406 m/s

Explanation:

Divide 325,000 meters by 800 and 800 seconds by 800 (because we are trying to find the speed in meters per second.

325,000÷800 = 406.25 meters

800÷800 = 1 second

≈ 406 m/s

Distilled water with sodium chloride dissolved in it would be a _neutral because it is neither an aid nor a base

Distilled water with sodium chloride dissolved in it would be a neutral solution because neither sodium chloride nor water are acidic or basic. Sodium chloride dissociates into Na+ and Cl- ions in water, but neither of these ions react with water to produce H+ or OH- ions.

Therefore, the concentration of H+ and OH- ions in the solution remains unchanged, and the pH of the solution remains at 7, which is considered neutral. It is important to note that even though sodium chloride is a salt, not all salts necessarily produce neutral solutions.

Some salts can produce acidic or basic solutions, depending on the nature of the salt and the solvent used.

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Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals.

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are there any answer choices?

Answer & Explanation:

For the water to H2 and O2 problem:

1) Reactant is H20, it is to the left of the arrow.

2) Products are H2 (gas) and O2 (gas) because it is to the right and what is created.

For the CO2 + water -> Glucose + Oxygen problem:

1) Reactant is CO2 and H2O, it is to the left of the arrow and what is being changed.

2) Products are C6H12O6 (glucose) and O2 (gas) because it is to the right and what is created.

The green wavelength is absorbed by the medium hence it does not appear.

We know that absorption has to do with the process by which the atom is able to take in energy and this would lead to the upward movement of the electrons that are in the atom.

Thus the wavelengths that can be taken in by the atom as it is absorbing energy can be seen in the absorption spectrum. It is also possible to have gaps in the absorption spectrum due to absorption by the medium.

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Answer:

i think the answer is c because it says that is all they care

Answer:

One mole of calcium is present in one mole of calcium carbonate

Explanation:

Because its formula is CaCO3

Ca contains 2+ charge and CO3 contains 2- charge

The density of the liquid in the container is 25.45 grams per cubic centimetre which can be calculated by finding the difference in mass between the full and empty container and dividing it by the volume of the container.

To calculate the density of the liquid in the container, we need to find the difference in mass between the full and empty container. The mass of the liquid can be obtained by subtracting the mass of the empty container from the mass of the full container: 8501g - 682g = 7819g.

Next, we need to calculate the volume of the container. The volume of a rectangular container can be determined by multiplying its length, width, and height: \(2.50 cm * 10.1 cm * 12.2 cm = 306.95 cm^3.\)

Finally, we can calculate the density by dividing the mass of the liquid by the volume of the container: \(7819g / 306.95 cm^3 = 25.45 g/cm^3.\)

Therefore, the density of the liquid in the container is 25.45 grams per cubic centimetre.

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Answer:

If an orderly set of steps is followed, the observations and results are more reliable. The experiment can be conducted again using the sample procedure.

Explanation:

Hope it helps :)

Answer:

sugar and carbon dioxide

Explanation:

Chemical energy is stored in the bonds of sugars. When the bonds of a sugar molecule are broken, a burst of energy is released that the cell can use. Cells can release energy in two basic processes: cellular respiration and fermentation. Cellular respiration requires oxygen, but fermenta- tion does not.

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The process of enamination is commonly used to prepare enamines from aldehydes and ketones.

This reaction involves the addition of a secondary amine to a carbonyl compound, which forms an imine intermediate that then undergoes tautomerization to yield the final enamine product. The reaction is typically carried out under basic conditions, with the amine acting as the base catalyst.

The mechanism of enamination involves the formation of a Schiff base intermediate, which is stabilized by resonance. This intermediate then undergoes deprotonation and subsequent tautomerization to form the enamine product. Enamines have a variety of synthetic applications, including in the synthesis of pharmaceuticals and natural products.

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The fact that the rate of the forward reaction becomes greater than the rate of the reverse reaction best describes what happens to the reaction immediately after additional hydrogen iodide gas is added to the system. Here option B is the correct answer.

When additional hydrogen iodide gas is added to the system, according to Le Chatelier's principle, the equilibrium will shift in order to counteract the change. In this case, adding more hydrogen iodide gas will increase the concentration of the reactants, causing the equilibrium to shift to the right to produce more products and consume some of the added reactants.

Based on the balanced equation, increasing the concentration of hydrogen iodide will favor the forward reaction, causing the rate of the forward reaction to become greater than the rate of the reverse reaction.

However, it's important to note that the system will eventually reach a new equilibrium point where the rates of both the forward and reverse reactions will be equal again.

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Complete question:

Hzlg) + Iz(g) = 2 Hlg) Hydrogen gas reacts with iodine gas at constant temperature in a sealed rigid container. The gases are allowed to reach equilibrium according to the equation above: Which of the following best describes what will happen to the reaction immediately after additional hydrogen iodide gas is added to the system?

A - The rates of both the forward and reverse reactions do not change.

B - The rate of the forward reaction becomes greater than the rate of the reverse reaction;

C - The rate of the forward reaction becomes less than the rate of the reverse reaction.

D - The rates of both the forward and reverse reactions decrease:

Answer:

2Mg+O2=2MgO

Atomic number of Mg and O is equal in both side

The addition of ice at the end of the heating process is important because it increases the solubility of the aspirin product.

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The characteristic that all lipids have in common is that none of them dissolves readily in water. Lipids are organic molecules which are non-polar in nature. They can be described as a group of biomolecules which include triglycerides (fats and oils), phospholipids, steroids, and waxes, which are insoluble in water but soluble in organic solvents. Characteristic of lipids: Lipids have the following characteristics: They are made up of fatty acids and glycerol.

The characteristic that all lipids have in common is that none of them dissolves readily in water. Lipids are organic molecules which are non-polar in nature. They can be described as a group of biomolecules which include triglycerides (fats and oils), phospholipids, steroids, and waxes, which are insoluble in water but soluble in organic solvents. Characteristic of lipids: Lipids have the following characteristics: They are made up of fatty acids and glycerol.

The three fatty acids are combined with glycerol through ester bonds. Lipids are nonpolar molecules which make them soluble in nonpolar solvents and insoluble in polar solvents. Lipids are important for energy storage, as they are used to store energy in a compact form. Lipids provide insulation, cushioning, and protection to the vital organs of the body.Lipids are not acidic when mixed with water, and they do not contain nitrogen.

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Answer:

c

Explanation:

Answer:

All living things use cellular respiration to turn organic molecules into energy. ... This process makes energy from food molecules available for the organism to carry out life processes. Cellular respiration usually occurs in the presence of oxygen. This is called aerobic respiration.

To solve this problem, we can use the following steps:

Step 1: Calculate the amount of H+ ions in the lake.

pH is a measure of the concentration of hydrogen ions (H+) in a solution. The lower the pH, the higher the concentration of H+ ions. The pH of the lake is 4.045, so we can calculate the concentration of H+ ions using the following equation:

pH = -log[H+]

4.045 = -log[H+]

[H+] = 7.27 × 10^-5 mol/L

Step 2: Calculate the amount of hydroxide ions (OH-) needed to neutralize the H+ ions.

To raise the pH to 7.00, we need to add enough hydroxide ions (OH-) to neutralize the H+ ions in the lake. The balanced chemical equation for this reaction is:

Ca(OH)2 + 2H+ → Ca2+ + 2H2O

For every 2 H+ ions, we need 1 Ca(OH)2 molecule to neutralize them. The amount of Ca(OH)2 needed can be calculated using the following equation:

mol Ca(OH)2 = 0.5 × [H+] × V / 1000

where V is the volume of the lake in liters (8.99 × 10^7 L), and we divide by 1000 to convert from cubic meters to liters.

mol Ca(OH)2 = 0.5 × (7.27 × 10^-5 mol/L) × (8.99 × 10^7 L) / 1000

mol Ca(OH)2 = 3275.5 mol

Step 3: Calculate the mass of CaO needed to produce the required amount of Ca(OH)2.

To produce Ca(OH)2, we need to react CaO with water:

CaO + H2O → Ca(OH)2

The molar mass of CaO is 56.08 g/mol, so the mass of CaO needed can be calculated using the following equation:

mass CaO = mol CaO × molar mass CaO

mol CaO = mol Ca(OH)2 / 1 (from the balanced equation)

mass CaO = (mol Ca(OH)2 / 1) × (molar mass CaO / 1 mol CaO)

mass CaO = 3275.5 mol × 56.08 g/mol

mass CaO = 183,812.8 g = 183.8 kg (to 3 significant figures)

Therefore, 183.8 kg of CaO must be added to raise the pH of the lake from 4.045 to 7.00.

Answer:

Kinetic energy depends on the velocity of the object squared

Explanation:

Kinetic energy depends on the velocity of the object squared. This means that when the velocity of an object doubles, its kinetic energy quadruples. ... Kinetic energy must always be either zero or a positive value. While velocity can have a positive or negative value, velocity squared is always positive.

The molality of Li+ ions in the 0.302 M solution of Li3PO4 is 0.906 moles/kg.

The compound Li3PO4 dissociates completely in solution, meaning that it breaks apart into its individual ions. The equation for the complete dissociation of Li3PO4 in water is:

Li3PO4 (s) → 3Li+ (aq) + PO4^3- (aq)

The molality of a solution is defined as the number of moles of solute per kilogram of solvent.

In this case, the solvent is water and the solute is lithium ions (Li+).

To calculate the molality, we need to know the moles of Li+ ions and the mass of the water solvent.

We can use the concentration (0.302 M) and the molar mass of Li3PO4 to find the moles of Li+ ions in the solution.

The molar mass of Li3PO4 is (3 x 6.939 + 31.97 + 4 x 16.00) g/mol = 158.964 g/mol.

If the solution is 0.302 M, then 0.302 moles of Li3PO4 are present in every liter of solution.

Since the compound dissociates completely into 3 Li+ ions and 1 PO4^3- ion, there are 0.302 x 3 = 0.906 moles of Li+ ions in 1 liter of solution.

Let's assume the mass of the water solvent is 1000 g.

The molality of the solution can then be calculated as:

molality = moles of solute / kilograms of solvent

= 0.906 moles / (1000 g / 1000 g/kg)

= 0.906 moles/kg

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Answer:

C. A down-filled coat via a p e x

Thermal insulation maintains the temperature inside the system and inhibits heat transfer. A down-filled coat would have the best thermal insulation properties. Thus, option C is correct.

Thermal insulation is the property of the substance to resist the heat and energy transfer from a substance of abundance to a lesser concentration. They lack the conducting particles.

It inhibits the heat to get transferred to other substances. The minimum heat transfer is achieved by the structural formation and the choice of the substance.

A down-filled coat is made of insulation material that keeps warm during the winters as its structure can trap and retain heat making the person warm during colds.

Therefore, option C. A down-filled coat best shows thermal insulation.

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The number of electrons transferred if the total charge passing through a circuit is 0.024 coulombs is approximately 1.5 x 10²⁰ electrons.

To calculate the number of electrons transferred, we need to use the elementary charge (e) as a conversion factor. The elementary charge is the charge carried by a single electron, which is approximately 1.602 x 10⁻¹⁹ coulombs.

We can calculate the number of electrons by dividing the total charge (Q) by the elementary charge (e): Number of electrons = Total charge / Elementary charge

Substituting the given values: Number of electrons = 0.024 C / (1.602 x 10⁻¹⁹ C)

Calculating this expression, we find: Number of electrons ≈ 1.5 x 10²⁰electrons

Therefore, approximately 1.5 x 10²⁰ electrons would be transferred if the total charge passing through the circuit is 0.024 coulombs.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl