Determine the [OH] concentration in a 0.169 M Ca(OH)2 solution.
why is the answer 0.338M and not 2.96*10^-14

False. The addition of a solute to a solvent typically lowers the freezing point of the solution compared to the freezing point of the pure solvent.

This is due to the fact that the solute particles interfere with the arrangement of the solvent particles, which makes it more difficult for the solution to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. Freezing point depression is a colligative property, which means that it depends on the concentration of solute particles in the solution, rather than on their chemical nature. When a non volatile  solute (a solute that does not evaporate at room temperature) is dissolved in a solvent, it increases the number of solute particles in the solution. These solute particles interfere with the arrangement of the solvent particles, making it more difficult for the solvent to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. To summarize, the addition of a non volatile solute to a solvent typically lowers the freezing point of the solution, and therefore the statement "The freezing point of the solution is unchanged by the addition of the solvent" is false.

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Radio waves have a lower frequency and energy than X-Rays, so the wavelength of radio waves is longer than X-Rays. longer. Option d is correct.

The best approach to compare them is to say that "A gamma ray has more energy than a radio wave because it has a shorter wavelength and a higher frequency."

The most energetic and high frequency particles are gamma rays. On the other side, radio waves are the EM radiation types with the lowest energies, longest wavelengths, and lowest frequencies.

All electromagnetic radiation travels in a vacuum at the speed of light (c), which is the same for all electromagnetic radiation types, including microwaves, visible light, and gamma rays.

Gamma rays contain the maximum energy because they are the strongest members of the electromagnetic spectrum. As a result, they also have a very low frequency and are better able to penetrate solids since they are less likely to interact with matter.

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Answer:

True or T

Explanation:

Is the correct answer please make me brainliest

Answer:

B

Explanation:

its an acidic oxide, it disolves in water to form carbonic acid which is an acid

Correct options are: Beth went back toward her origin. Beth speed up considerably. Using the concept of speed of the object the line from time 6 to 10 indicate

Velocity is the pace and direction of an item's movement, whereas speed is the time rate at which an object is traveling along a route. To put it another way, velocity is a vector, whereas speed is a scalar value.

The amount of distance an item travels in one unit of time is known as its speed. Another name for rate is speed. A rate reveals how much something happens or changes in a given length of time. speed of the object is defined as the slope of the position time graph

here we know that

initially it moves from t = 0 to t = 6 from x = 2 to x = 8

so the slope is given as:

v = (x₂ - x₁) / (t₂ - t₁)

v = (8 - 2) / (6 - 0)

v = 1 m/sec

similarly for next we have

again it comes to x = 0 after t = 10 s

so the speed is:

v₂ = (x₃ - x₂) / (t₃ - t₂)

v₂ = (0 - 8) / (10 - 6)

v₂ = - 2 m/sec

so here the velocity is negative which shows that it will move in reverse direction also its velocity is also increase

so correct answers are:

Beth went back toward her origin.

Beth speed up considerably.

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The complete question is as follows:

The graph is the path Beth took on a walk.

A graph with horizontal axis time (seconds) and vertical axis position in (meters). The line runs in 2 straight segments from 0 seconds 2 meters to 6 seconds 8 meters to 10 seconds 0 meters.

What does the line from time 6 to 10 indicate?

Beth slowed down considerably.

Beth went back toward her origin.

Beth sped up considerably.

Beth went farther away from origin.h expression is equivalent to

Carbonic anhydrases are a class of zinc containing enzymes that catalyze the conversion of carbon dioxide into bicarbonate ions.

Carbonic anhydrases are a kind of enzyme that catalyzes the interconversion of carbon dioxide, water, and carbonic acid dissociated ions. Most carbonic anhydrases have a zinc ion in their active site. As a result, they are classed as metalloenzymes. Carbonic anhydrase is an enzyme that aids in the quick interconversion of carbonic acid, protons, and bicarbonate ions from carbon dioxide and water.

Carbonic anhydrase is present in the blood, gastrointestinal mucosa, and a trace amount in plasma. Carbonic anhydrase enzymes catalyze the conversion of water and carbon dioxide to carbonic acid dissociated ions. This results in the formation of bicarbonate anions, which dissolve in the blood plasma.

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Answer:

The pH of a solution with a (H+] = 0.80 M is \(9.6 e^{-2}\)

Explanation:

As we know

pH = -[log H+]

Substituting the value of H+ ion concentration in the above equation, we get -

pH = -log [0.80]

pH \(= -[-0.096] = 0.096 = 9.6 e^{-2}\)

The mole fraction of gas b is 0.457, which corresponds to answer choice (c).

To find the mole fraction of gas b, we need to first calculate the total pressure inside the vessel. This can be done by adding the partial pressures of gas a and gas b:

Total pressure = Partial pressure of gas a + Partial pressure of gas b
Total pressure = 7.00 atm + 5.89 atm
Total pressure = 12.89 atm

Next, we can use the mole fraction formula to calculate the mole fraction of gas b:

At 25.0°C, a 10.00 L vessel is filled with 7.00 atm of gas A and 5.89 atm of gas B. To find the mole fraction of gas B, you'll need to use the formula:

Mole fraction of gas b = (Partial pressure of gas b) / (Total pressure)
Mole fraction of gas b = 5.89 atm / 12.89 atm
Mole fraction of gas b = 0.457

So, the mole fraction of gas B is 0.457.

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Answer:

They move in fixed orbits around the nucleus.

Explanation:

In the Bohr model, it shows the electrons moving in fixed paths around the nucleus, making it easier to see and count them.

Answer:

Pretty sure the electrons orbit.

Explanation:

The conjugate acid of HSO₄⁻ is H₂SO₄ (sulfuric acid). The conjugate acid of HSO₄⁻ is H₂SO₄ (sulfuric acid). When HSO₄⁻ accepts a proton, it forms its conjugate acid, which is sulfuric acid.

To understand the concept of conjugate acids, it's important to know about acids and bases. In chemistry, an acid is a substance that can donate a proton (H⁺ ion), while a base is a substance that can accept a proton. When an acid donates a proton, it forms its conjugate base, and when a base accepts a proton, it forms its conjugate acid.

In the case of HSO₄⁻ (hydrogen sulfate or bisulfate ion), it acts as a base by accepting a proton. If we add a proton (H⁺) to HSO₄⁻, it becomes H₂SO₄ (sulfuric acid). Therefore, H₂SO₄ is the conjugate acid of HSO₄⁻.

Sulfuric acid (H₂SO₄) is a strong acid that is commonly used in various industrial processes and laboratories. It is highly corrosive and can dissociate completely in water to release two protons (H⁺ ions). In the conjugate acid-base pair H₂SO₄/HSO₄⁻, HSO₄⁻ is the conjugate base formed when one proton is removed from sulfuric acid.

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Answer:

Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.

Explanation:

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Neutrons - 48

Protons - 36

Electrons - 36

The chemical element Krypton has 48 neutrons, 36 electrons and 36 protons.

Krypton is a chemical element with the symbol Kr, atomic number 36 and atomic mass of 83.79.

The number of neutrons, protons and electrons present in chemical element krypton is given as follows;

Thus, the chemical element Krypton has 48 neutrons, 36 electrons and 36 protons.

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1.567 g of solute is needed to make 3450 ml of a 2.25 M solution of Ca(NO3)2.

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.

Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in liters, is the most widely used unit to express solution concentration: liters of solution/moles of solute equals M. One liter of a solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.

No. of moles of NO₃⁻ = (0.1528 mol/L) × (125.00/1000 L) = 0.0191 mol

Each mole of Ca(NO₃)₂ contains 2 moles of NO₃⁻.

No. of moles of Ca(NO₃)₂ = (0.0191 mol) × (1/2) = 0.00955 mol

Molar mass of Ca(NO₃)₂ = (40.078 + 14.007×2 + 15.999×6) g/mol = 164.086 g/mol

Mass of Ca(NO₃)₂ required = (0.00955 mol) × (164.086 g/mol) = 1.567 g

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A process in which two atoms collide and their nuclei merge, forming a new atom and releasing energy is the meaning of Nuclear Fusion.

Nuclear fusion is a process in which two atomic nuclei collide and merge to form a new, heavier nucleus. This process releases a large amount of energy in the form of light and heat. Nuclear fusion is the process that powers the sun and other stars, where hydrogen atoms fuse to form helium. On earth, scientists are researching ways to replicate this process in controlled conditions as a source of clean, sustainable energy. Nuclear fusion reactions require high temperatures and pressures, and it can occur only in conditions found in the interiors of stars and certain artificially-made conditions.

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Answer:

The gas particles would have higher Kinetic energy.

Explanation:

From the formular of kinetic energy:

\({ \sf{KE = \frac{1}{2}m {v}^{2} }}\)

KE is the kinetic energy possessed by particle.

KE is the kinetic energy possessed by particle.m is the particle mass.

KE is the kinetic energy possessed by particle.m is the particle mass.v is the velocity attained by a particle

\({ \sf{KE = \{ \frac{1}{2} m \}} {v}^{2} }\)

keeping the mass, m constant:

\({ \sf{KE = k {v}^{2} }}\)

Therefore, KE is directly proportional to v² :

\({ \sf{KE \: \alpha \: {v}^{2} }}\)

so, when velocity increases, KE also increases.

Answer:

5.55 L

Explanation:

This excersise can be solved by the Boyle's law.

This law for gases states that the pressure of a gas in a vessel is inversely proportional to the volume of the vessel.

P₁ . V₁  = P₂ . V₂

The law comes from the Ideal Gases Law, in the first term.

P . V = n . R . T  In this case, n . R . T are all constant.

6.35 L . 88.6 kPa = 101.3 kPa . V₂

V₂ = (6.35 L . 88.6 kPa) / 101.3 kPa

V₂ = 5.55 L

It is inversely proportional because, as it happened in this case, pressure was increased, therefore volume decreased.

The molar mass of the compound is \(4.167 g/mol.\)

The molar mass of the compound is calculated using the ideal gas law, which states that \(PV = nRT\), where P is the pressure, V is the volume,R is the ideal gas constant, T is the temperature, and n is the quantity of moles of the gas.

To calculate the molar mass, we rearrange the ideal gas law to solve for n:

\(n =\frac{ PV}{RT}\)

For the given information,\(P = 750 torr, V = 256 mL, R = 0.0821 L- atm/K -mol, T = 373 K.\). We can plug these values into the equation to calculate the number of moles of the gas:

\(n =\frac {(750 torr)(0.256 L)}{(0.0821 L-atm/K-mol)(373 K) }\\ \\= 0.192 mol\)

We also know that 0.800 g of the compound is present. We can use the molar mass to calculate the number of moles of the compound:

\(Molar mass =\frsc{ 0.800 g }{0.192 mol}\\ \\ = 4.167 g/mol\)

Therefore, the molar mass of the compound is \(4.167 g/mol.\)

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The reaction \(2H_{2} O_{2}\) → \(2H_{2} O + O_2\) is thermodynamically favorable, meaning it occurs spontaneously in the forward direction under standard conditions.

The signs of ΔG (change in Gibbs free energy) and ΔS (change in entropy) can provide further insights into the thermodynamics of the reaction. In the given reaction, the formation of water and oxygen from hydrogen peroxide is accompanied by a decrease in the system's free energy. Thus, the ΔG value for this reaction is negative, indicating that it is exergonic and releases energy. This negative ΔG indicates that the reaction is thermodynamically favorable and tends to proceed in the forward direction. As for the ΔS value, the reaction involves the formation of two moles of water and one mole of oxygen from two moles of hydrogen peroxide. Since the products have a greater number of moles than the reactants, the ΔS value for this reaction is positive. This positive ΔS indicates an increase in entropy, reflecting a greater degree of randomness or disorder in the system.

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The amount of the 240 g sample of the radioisotope that will remain after 525 billion years is 7.5 g

n = t / t½

n = 525 / 105

n = 5

N = N₀ / 2ⁿ

N = 240 / 2⁵

N = 240 / 32

N = 7.5 g

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Answer:

7.5

Explanation:

edge

The mass percent composition of the given compounds is as follows:

a. MgF₂: 61.08% magnesium, 38.92% fluorine

b. Ca(OH)₂: 54.09% calcium, 43.69% oxygen, 2.22% hydrogen

c. C₄H₈O₄: 40.00% carbon, 6.67% hydrogen, 53.33% oxygen

d. (NH₄)₃PO₄: 23.76% nitrogen, 24.08% hydrogen, 51.15% oxygen, 1.00% phosphorus

e. C₁₇H₁₉NO₃: 73.84% carbon, 7.04% hydrogen, 9.23% nitrogen, 9.89% oxygen

The mass percent composition of a compound refers to the relative masses of its constituent elements expressed as a percentage of the total mass of the compound. In other words, it indicates the proportion of each element present in the compound by weight.

For compound a, MgF₂ (magnesium fluoride), the molar mass of magnesium (Mg) is 24.31 g/mol, and the molar mass of fluorine (F) is 18.99 g/mol. Therefore, the mass percent composition of MgF₂ is calculated by dividing the mass of each element by the molar mass of the compound and multiplying by 100.

Similarly, for compound b, Ca(OH)₂ (calcium hydroxide), the molar masses of calcium (Ca), oxygen (O), and hydrogen (H) are 40.08 g/mol, 16.00 g/mol, and 1.01 g/mol, respectively.

Compound c, C₄H₈O₄ (erythrose), is a carbohydrate. Its mass percent composition is determined by the molar masses of carbon (C), hydrogen (H), and oxygen (O), which are 12.01 g/mol, 1.01 g/mol, and 16.00 g/mol, respectively.

Compound d, (NH₄)₃PO₄ (ammonium phosphate), is a fertilizer. It contains nitrogen (N), hydrogen (H), oxygen (O), and phosphorus (P). The molar masses of these elements are 14.01 g/mol, 1.01 g/mol, 16.00 g/mol, and 30.97 g/mol, respectively.

Lastly, compound e, C₁₇H₁₉NO₃ (morphine), is a painkiller. It consists of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O). Their molar masses are 12.01 g/mol, 1.01 g/mol, 14.01 g/mol, and 16.00 g/mol, respectively.

Mass percent composition provides valuable information about the composition of a compound, allowing us to understand the relative proportions of its constituent elements. It is a crucial concept in chemistry, particularly in determining the purity of substances, analyzing chemical reactions, and designing chemical processes. Calculating mass percent composition helps chemists understand the behavior and properties of compounds, aiding in fields such as pharmaceuticals, materials science, and environmental studies.

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Answer:

FeCl3 + 3NH4OH ---> Fe(OH)3 + 3NH4Cl

Explanation:

Just make sure that both sides are equal

FeCl3 + 3NH4OH ---> Fe(OH)3 + 3NH4Cl

Answer:

Explanation:

- 3 - 3

The order of decreasing bond angle is:

\(OCl_{2} > SiCl_{4} > PCl_{3} > SCl_{2} > {SiCl_6} ^{2-}\)

To determine bond angles in a molecule, it's best to determine the hybridization of the central atom. According to the VSEPR model, of the given molecules, four have tetrahedral \(sp^{3}\) hybridization (with optimal bond angles of 109 degrees) and \({SiCl_{6}}^{2-}\) has octahedral \(sp^{3}d^{2}\) hybridization (with optimal bond angles of 90 degrees). This means that \({SiCl_{6}}^{2-}\) certainly has the smallest bond angle, while the other four have variations on the value of 109 degrees.

When looking at the other four molecules, oxygen dichloride will display the widest bond angle (111 degrees), due to the bulkiness of the chlorine atoms around the relatively small oxygen atom. Silicon tetrachloride displays the ideal 109-degree angle, while phosphorus trichloride and sulfur dichloride have much smaller bond angles of 103 degrees, because of the greater repulsion exhibited by the nonbonding electron pairs. Because sulfur has two nonbonding pairs, and phosphorus only has one, the deviation will be larger with sulfur, resulting in a slightly smaller bond angle.

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If the half life of C0-60 is 5.2 years; then approximately 273.38 mg of the 1000 mg sample will remain after 9.50 years.

The half-life of C0-60 is 5.2 years, meaning that after 5.2 years, half of the original sample will have decayed. After another 5.2 years, half of what remained will have decayed, and so on.

To calculate how much of the sample will remain after 9.50 years, we need to divide 9.50 by 5.2 to find out how many half-lives have passed.

This gives us a quotient of 1.83. We then raise 0.5 to the power of 1.83, which gives us a result of 0.274.

Multiplying this by the original sample size of 1000 mg gives us the answer: approximately 273.38 mg of the 1000 mg sample will remain after 9.50 years.

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Answer:

Column A            \({}\)                                              Column B

1. CaS                   \({}\)                                              Calcium Sulfide

2. CaSO₄            \({}\)                                                Calcium sulfate

3. CaSO₃            \({}\)                                                 Calcium sulfite

Explanation:

1) Calcium sulfide is a compound formed between calcium, Ca, and sulfur, S, with a chemical formula of CaS. It forms cubic crystals similar to rock salt, and smells like rotten eggs

2) Calcium sulfate is a chemical compound consisting of calcium, Ca, and sulfate SO₄. It is found in nature in the hydrated form as the mineral gypsum

3)Calcium sulfite is a chemical compound formed between calcium, Ca and sulfite, SO₃ used to treat water and preserve food.

Answer:

the formula for calcium sulfite is CaSO3

the formula for calcium sulfate is CaSO4

the formula for calcium sulfide is CaS

Explanation:

Answer: Just in case your still stuck, The half-life of iron-59 is 44.5 days, which means that half of the original sample will decay in that amount of time. After 133.5 days, 2.76 g of iron-59 remains. To find the original mass of the sample, we need to know how many half-lives have passed.

133.5 days / 44.5 days/half-life = 3 half-lives

After three half-lives, the remaining mass is 1/8 of the original mass. Therefore,

2.76 g * 8 = 22.08 g

The original mass of the sample was 22.08 grams.

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The amount of sodium chloride that would be formed if 92 g of sodium reacted with 142 g of chlorine would be 233.76 grams.

Sodium chloride is formed when sodium metal reacts with chlorine molecules according to the following balanced chemical equation:

\(2Na + Cl_2 -- > 2NaCl\)

The mole ratio of Na to Cl according to the equation is 2:1.

Recall that: mole = mass/molar mass

92 g of sodium is equivalent to = 92/23 = 4 mol

142 g of chlorine would be = 142/71 = 2 mol

Okay, so the two reactants balance stoichiometrically as well.

The mole ratio of Na to NaCl is 1:1, thus, 4 moles of NaCl would be formed as well.

Thus, 4 mol of NaCl would be equivalent to:

4 x 58.44 = 233.76 grams

In other words, the amount of NaCl that would be formed is 233.76 grams.

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The condition or progress of a reaction is represented by reaction arrows. The chemical reaction arrow is a single straight arrow that points from the reactant(s) to the product(s) and by-products, as well as side products.

I think this should help you find the answer more easy!

A. Absorption. Both processes are relatod to the way drugs are absorbed into the system.