Complete and balance the hydrolysis reactions for the reactions listed a. CO3^2- + H2O =
b. HSO4- + H2O =
c. HCO3- + H2O =
d. NH4+ + H2O =
e. AlCl3 + H2O =
(hint: AlCl3(aq) is more accurately described as Al(H2O)_6^3+)

Answer: Hydrogen - 18.286%( mass present)

              Carbon - 81.714%(mass present)

Explanation:

Mass percentage does not have any unit as numerator and denominator contains the same unit. Therefore, the percent composition of C and H in C\(_3\)H\(_8\) is 81.8% and 18% respectively.

Mass percentage represents the the percentage of each element that is making a particular compound.

Mathematically,

Percentage of mass = (component’s mass ÷ total mass) x 100%

Atomic weight of different element of calcium phosphate

C= 12g/mol , H=1g/mol

Total mass of Carbon element in C\(_3\)H\(_8\) = 12 × 3 = 36

Total mass of hydrogen atom in C\(_3\)H\(_8\) = 1 × 8 = 8

Total molar mass of  C\(_3\)H\(_8\) =36 + 8 =44 g/mole

Percentage of carbon in C\(_3\)H\(_8\) =36/44× 100  =81.8%

Percentage of hydrogen in C\(_3\)H\(_8\) =(8÷44)×=18%

Therefore, the percent composition of C and H in C\(_3\)H\(_8\) is 81.8% and 18% respectively.

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The \([OH^-]\) of a \(0. 255 M\) solution of pyridine, \(C_5H_5N\) is \(4.30 * 10^{-10} M\).

The pH of a \(0. 400 M\) solution of aniline, \(C_6H_5NH_2\) is \(9.98.\)

1]  Pyridine \((C_5H_5N)\) is a weak base, and its Kb value is given as \(1.69 * 10^{-9}\). To find the \([OH^-]\) of a \(0.255 M\) solution of pyridine, we can use the following equation:

\(Kb = [OH^-][C_5H_5N]/[C_5H_5NH^+]\)

where \([C_5H_5NH^+]\)represents the concentration of the conjugate acid of pyridine, which is negligible compared to the concentration of pyridine.

Rearranging the equation and plugging in the values, we get:

\([OH^-] = Kb[C_5H_5N] / [C_5H_5NH^+]\\= (1.69 * 10^{-9})(0.255) / 1\\= 4.30 x 10^ {-10} M\)

Therefore, the \([OH^-]\) of the solution is \(4.30 * 10^{-10} M.\)

2] Aniline \((C_6H_5NH_2)\) is also a weak base, and its Kb value is given as \(4.27 * 10^{-10}.\) To find the pH of a  \(0.400 M\) solution of aniline, we can use the following equation:

\(Kb = [OH^-][C_6H_5NH_2]/[C_6H_5NH_3^+]\)

where\([C_6H_5NH_3^+]\)represents the concentration of the conjugate acid of aniline, which is formed when aniline accepts a proton from water.

We can assume that \(x\) moles of aniline react with water to form \(x\) moles of \(C_6H_5NH_3^+\) and \(x\) moles of \(OH^-\). Therefore, the initial concentration of aniline, \([C_6H_5NH_2]\), will decrease by \(x\), while the concentrations of \([C_6H_5NH_3^+]\) and \([OH^-]\) will increase by \(x\). At equilibrium, we can express the concentrations as given follows:

\([C_6H_5NH_2] = 0.400 - x\)

\([C_6H_5NH_3^+] = x\)

\([OH^-] = x\)

The value of \(x\) can be determined using the Kb expression:

\(Kb = [OH^-][C_6H_5NH_2]/[C_6H_5NH_3^+]\\\\x = \sqrt{(Kb[C_6H_5NH_2]/[C_6H_5NH_3^+])} \\= \sqrt{((4.27 * 10^{-10})(0.400) / 1)}\\= 1.04 * 10^{-5} M\)

Therefore, the \([OH^-]\) of the solution is\(1.04 * 10^{-5} M,\) and the pH can be calculated using the expression:

\(pH = 14 - pOH\\= 14 - log([OH^-])\\= 14 - log(1.04 * 10^{-5})\\= 9.98\)

Therefore, the pH of the solution is \(9.98\).

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Answer:

4 i think

Explanation:

The resulting pressure of the gas after decreasing the initial volume is 3 atm.

According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:

P ∝\(\frac{1}{V}\)

For the given question required equation is:

P₁V₁ = P₂V₂, where

P₁ = initial pressure = 1.5 atm

V₁ = initial volume = 2 L

P₂ = final pressure = ?

V₂ = final volume = 1 L

On putting all these values on the above equation, we get

P₁V₁ = P₂V₂

P₂ =\(\frac{1.5}{2X1}\) = 3atm

Hence required pressure is 3 atm.

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Answer:

0.25 mole of NO2 contains 0.25 mole 'N'

one mole contains   6.023 x 10 ^23 atoms

0.25 mole   II------------------------------>?

            = 0.25 x 6.023 x10^23 = 1.5 x 10^23 atoms

Explanation:

The concentration of \(\rm Ca^ {2+}\) when \(\rm Ag_2SO_4_\ {(s)}\) begins to precipitate is 0.0500 M, when sodium sulfate is slowly added to a solution.

Concentration is a measure of the amount of solute dissolved in a given amount of solvent or solution.

When sodium sulfate is added to the solution, it reacts with the calcium ions to form calcium sulfate, which is insoluble and precipitates out of the solution. The balanced equation for the reaction is:

\(\rm Ca^{2+} + SO_4^{2-} \rightarrow CaSO_4\)

The solubility product constant (Ksp) of calcium sulfate is \(4.93 \times 10^{-5}\) .

\(\rm Ag_2SO_4_\ {(s)}\) is also formed by the reaction of \(\rm Ag^+\)and \(\rm SO_4^{2-}\), but it is not used up until all \(\rm Ca^ {2+}\) ions are consumed.

Therefore, \(\rm Ag_2SO_4_\ {(s)}\) does not precipitate until all \(\rm Ca^ {2+}\) ions have reacted.

The concentration of \(\rm Ca^ {2+}\)when \(\rm Ag_2SO_4_\ {(s)}\) begins to precipitate can be calculated using the Ksp expression for \(\rm CaSO_4\):

\(\rm Ksp = [Ca^{2+}][SO_4^{2-} ]\)

Since the reaction is 1:1, the concentration of \(\rm Ca^ {2+}\) is equal to the initial concentration of \(\rm Ca^ {2+}\) before any reaction occurs.

Therefore, the concentration of \(\rm Ca^ {2+}\) when \(\rm Ag_2SO_4_\ {(s)}\) begins to precipitate is 0.0500 M.

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Triglycerides are the type of molecule NEVER contains a phosphate group.

Triglycerides are a type of lipid molecule composed of three fatty acid molecules attached to a glycerol backbone. These molecules do not contain a phosphate group and the structure is represented as follows:

C3H5(OH)3 + 3C17H33COO → C3H5(OH)3(C17H33COO)3

Triglycerides are an important source of energy for the body, and they also help to store and transport certain vitamins and hormones. High levels of triglycerides can increase the risk of heart disease, stroke, and other health problems. To lower triglycerides, people should eat a healthy diet, get regular exercise, and limit their intake of processed and sugary foods.

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complete question:Which type of molecule NEVER contains a phosphate group?

a. ATP

b. phospholipid

c. nucleic acid

d. triglycerides

From highest to lowest atomic radius:

Potassium > Lithium > Carbon > Boron > Fluorine.

Atomic number is the number of protons found in the nucleus of an atom, which determines the element and its unique properties. It is denoted by the symbol "Z" and is listed in the periodic table of elements along with the element's symbol, name, and atomic mass.

The nucleus is the central core of an atom, composed of protons and neutrons, which are collectively known as nucleons. It is located at the center of the atom and contains almost all of its mass. The number of protons in the nucleus determines the identity of the atom and is referred to as the atomic number. The nucleus is held together by the strong nuclear force, which is one of the four fundamental forces of nature.

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Concentrations of O₂ and CO₂ in inhaled air compare with exhaled air when inhaled will have more oxygen and less carbon dioxide and when exhaled air have more carbon dioxide and less oxygen

Respiration is the act of respiring inhalation and exhalation of air and also called breathing and respiration also described as human take in oxygen and release carbon dioxide and this oxygen that is taken in by the cells is used for carrying various functions in the cell and is also used for deriving energy from the food and inhaled air is the oxygen rich and this air is important for the requirement of energy and exhaled air is the air that breath out which is waste air carbon dioxide which is not require for the body

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Answer:

the answer is d

Explanation:

i just did it

The characteristic property of ionic compounds is B. They form hard, brittle crystals.

Ionic bond is a chemical bond formed as the result of transfer of electrons from one atom to another.

Ionic bonds are held by strong electrostatic force. Properties of ionic bonds are:

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In this case, since the unmarked beaker contained a strong base, we can expect its pH to be greater than 7.

.
To determine the pH of the unmarked beaker before adding the acid, we need to understand the pH scale. The pH scale ranges from 0 to 14, with a pH of 7 being neutral, below 7 being acidic, and above 7 being basic.
Since we know the solution in the unmarked beaker was a strong base, it is likely to have a high pH value.

Common strong bases include sodium hydroxide (NaOH) and potassium hydroxide (KOH). The pH of these strong bases in a concentrated solution is typically between 12 and 14.
However, without additional information about the specific strong base and its concentration, it is impossible to give an exact pH value for the unmarked beaker.

In summary, we can conclude that the pH of the unmarked beaker before adding the acid was above 7, indicating a strong basic solution, but we would need more information to determine the exact pH value.

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In this question, we have two compounds, ClF and LiCl. The first molecule is a covalent compound, since we will not have donation of electrons but instead the sharing of electrons, but in this case, the difference of the electronegativity will cause this molecule to have Polar covalent bond, which will cause partial charges to occur. LiCl is a molecule in which we have a greater difference in electronegativity, which makes this molecule be an ionic molecule, and not covalent. Since ionic compounds have real charges, the only possible answer will be ClF, since they have partial charges. Letter B

Answer: the answer is C

Explanation:

Answer:

so since the model atom was changed as new evidence, and the plum pudding model was a ball of positive charge, the alpha particle scattering which broke up the atom

a. The balls were most likely mothballs, which are commonly made of naphthalene or paradichlorobenzene.

b. The balls disappeared/decreased in size due to sublimation, where they transitioned from solid to gas without becoming a liquid.

c. The purpose of putting the balls along with clothes was to repel moths and other insects, protecting the woolen clothes from damage during storage.

a. The composition of the balls was most likely mothballs, which are typically made of a chemical compound called naphthalene or paradichlorobenzene.

b. The balls disappeared or decreased in size due to sublimation. Mothballs undergo a process called sublimation, where they transition from a solid to a gas state without going through the liquid phase. This means that over time, the mothballs slowly vaporize and dissipate into the air, resulting in their decrease in size or disappearance.

c. The purpose of putting those balls along with clothes was to prevent damage from moths and other insects. Mothballs contain chemicals that release a strong odor, which is unpleasant to insects. The odor acts as a deterrent and helps protect the clothes from being damaged by moth larvae or other pests that feed on natural fibers like wool. By placing the mothballs in the storage area, it creates an environment that repels these insects and helps preserve the quality of the woollen clothes during storage.

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Thyroid hormone contains the mineral iodine (option I). Details about thyroid hormone can be found below.

Thyroid hormone is the hormone produced by the thyroid gland of the body, which is a large butterfly-shaped endocrine gland situated on the front of the neck that produces various hormones.

The thyroid hormone is responsible for regulating metabolism, which controls the amount of calories burnt in a day.

One of the major minerals found in the thyroid is iodine. The thyroid gland absorbs iodine from the bloodstream, and then stores it to aid in the production of thyroid hormones.

Therefore, the thyroid hormone contains the mineral iodine.

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Answer:

3)The nuclear charge of each successive atom increases, and the atomic radius decreases

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Answer:The answer is

153.7

k

J

.

What you are asked to determine is the total energy required to go from ice to water, and then from water to vapor - the phase changes underwent by the water molecules.

In order to do this, you'll need to know:

Heat of fusion of water:

Δ

H

f

=

334

J

/

g

;

Heat of fusion vaporization of water:

Δ

H

v

=

2257

J

/

g

;

Specific heat of ice:

c

=

2.09

J

/

g

∘

C

;

Specific heat of water:

c

=

4.18

J

/

g

∘

C

;

Specific heat of steam:

c

=

2.09

J

/

g

∘

C

;

So, the following steps describe the overall process:

1. Determine the heat required to raise the temperature of the ice from

−

15.0

∘

C

to

0

∘

C

:

q

1

=

m

⋅

c

i

c

e

⋅

Δ

T

=

50.0

g

⋅

2.09

J

g

⋅

∘

C

⋅

(

0

∘

C

−

(

−

15

∘

C

)

)

=

1567.5

J

2. Determine the heat required to convert

0

∘

C

ice to

0

∘

C

water:

q

2

=

m

⋅

Δ

H

f

=

50.0

g

⋅

334

J

g

=

16700

J

3. Determine the heat required to go from water at

0

∘

C

to water at

100

∘

C

:

q

3

=

m

⋅

c

w

a

t

e

r

⋅

Δ

T

=

50.0

g

⋅

4.18

J

g

⋅

∘

C

⋅

(

100

∘

C

−

0

∘

C

)

=

20900

J

4. Determine the heat required to convert

100

∘

C

water to

100

∘

C

vapor:

q

4

=

m

⋅

Δ

H

v

=

50.0

g

⋅

2257

J

g

=

112850

J

5. Determine the heat required to go from

100

∘

C

vapor to

120

∘

C

vapor:

q

5

=

m

⋅

c

v

a

p

o

r

⋅

Δ

T

=

50.0

g

⋅

2.09

J

g

⋅

∘

C

⋅

(

120

∘

C

−

100

∘

C

)

=

2090

J

Therefore, the total heat required is

q

T

O

T

A

L

=

q

1

+

q

2

+

q

3

+

q

4

+

q

5

=

152696.5

J

=

153.7

Explanation:

The energy liberated by condensing 55.4 mol of steam at 100.0 °C and allowing the liquid to cool to 30.0°C is 6.52 x 10^6 J.

The energy required to vaporize 25.0 g of water at its boiling point of 100.0°C is 2.64 x 10^5 J.

The heat transferred to the surroundings as the cup of coffee at 85.0°C and containing 250.0 g of coffee and 30.0 g of milk cools to room temperature, 25.0°C, is 1.47 x 10^4 J.

To calculate the energy liberated when steam condenses and cools, we need to use the following equation:

q = m * (ΔHvap + ΔHfus) + m * Cp * ΔT

where:

q is the energy liberated (in joules)

m is the mass of the substance (in kg)

ΔHvap is the enthalpy of vaporization (in J/kg)

ΔHfus is the enthalpy of fusion (in J/kg)

Cp is the specific heat capacity (in J/(kg*K))

ΔT is the change in temperature (in K)

First, we need to calculate the mass of the steam. We can use the molar mass of water to convert the number of moles to mass:

m = 55.4 mol * 18.015 g/mol = 997.17 g

Next, we need to calculate the enthalpy of vaporization and the enthalpy of fusion of water. At 100.0°C, the enthalpy of vaporization is 40.7 kJ/mol, and at 0.0°C, the enthalpy of fusion is 6.01 kJ/mol.

ΔHvap = 40.7 kJ/mol

ΔHfus = 6.01 kJ/mol

We also need to calculate the specific heat capacity of liquid water. At 30.0°C, the specific heat capacity of liquid water is 4.18 J/(g*K).

Cp = 4.18 J/(g*K)

Finally, we need to calculate the change in temperature from 100.0°C to 30.0°C:

ΔT = 30.0°C - 100.0°C = -70.0°C = -70.0 K

Now we can plug these values into the equation and solve for q:

q = m * (ΔHvap + ΔHfus) + m * Cp * ΔT

q = (997.17 g / 1000 g/mol) * (40.7 kJ/mol + 6.01 kJ/mol) + (997.17 g) * (4.18 J/(g*K)) * (-70.0 K)

q = 44046.5 J + (-196850.1 J)

q = -152803.6 J

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Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

f is the force

m is the mass

From the question we have

\(a = \frac{8}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.

brainlest?

Answer: v = 83.96 m/s

Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.

Using the equation for the vertical displacement of an object in free fall:

Δy = (v₀² - v²) / (2g)

Δy = vertical displacement (203m)

v₀ = initial velocity (105 m/s)

v = final velocity (not known yet)

g = accerlation due to gravity (9.8 m/s^2)

Lets rearrange the equation to solve for the final velocity:

v = v = √(v₀² - 2gΔy)

Substituting the given values:

v = √(105² - 2 * 9.8 * 203)

v ≈ √(11025 - 3979.6)

v ≈ √(7054.4)

v ≈ 83.96 m/s

Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.

B.The potential energy the reactants have stored in molecular bonds

Answer:

To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius).

Explanation:

Answer:

31.64...

Explanation:

The formula is volume is equal to mass over density.

So 25/0.79=31.64...

The volume of ethyl alcohol is 31.645mL.

Volume is the amount of space the matter occupies.

Ethyl alcohol is a clear, colourless liquid and the main ingredient in alcoholic beverages.

Density = mass/volume

D = m/v

v x D = m

On multiply both sides by D,

 v x D/D = m/D

            v = m/D

               = 25g/0.79g/mL

               = 31.645mL

Hence, the volume of ethyl alcohol is 31.645mL.

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In this question, we have the following reaction, which is the cellular respiration reaction:

C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

We have:

120 grams of CO2 being produced

The molar ratio between CO2 and O2 is 6:6, which means the same amount of moles produced of CO2 will be the same amount used of O2

Now we find the number of moles of CO2, using its molar mass = 44.01g/mol

44.01 grams = 1 mol

120 grams = x moles

44.01x = 120

x = 120/44.01

x = 2.73 moles of CO2

If we have 2.73 moles of CO2, we will also have 2.73 moles of O2, and to find its mass, we will also use the molar mass of O2 = 32g/mol

32 grams = 1 mol

x grams = 2.73 moles

x = 2.73 * 32

x = 87.4 grams of O2

The amount required of oxygen gas to produce 120 grams of CO2 based on the cellular respiration reaction will be 87.4 grams

Carrying Capacity

Carrying capacity is defined as the number of organisms that can survive in an environment based on the supplies in the area.

Carrying Capacity Limits

There are multiple variables that can affect carrying capacity. Some of the most common ones are food, water, and space. There is a limited amount of all of these things, which means that the environment can only support a specific amount of organisms. In this case, there is enough food for 150 wolves; thus the carrying capacity is 150.

Changes in Carrying Capacity

Carrying capacity can change throughout time. If the amount of food, water, or space increases, then the carrying capacity will as well. The opposite is also true. So, if suddenly there was enough food for 200 wolves, the carrying capacity would become 200.

Answer:

A

Explanation:

becuase CaCI2 Is an inorganic compound

Scientists estimate that a single chlorine molecule in the CFC structure can destroy as many as 100,000 ozone molecules. So The correct answer is 100,000.

CFCs are fully halogenated paraffin hydrocarbons that contain only carbon, chlorine, and fluorine atoms. These organic compounds were discovered by scientists in 1928 and were initially used as a refrigerant, solvents, and aerosol propellants.

CFCs are known to be the primary cause of the depletion of the ozone layer. When these chemicals are exposed to ultraviolet light, they break down and release chlorine atoms. The chlorine atoms then react with ozone molecules, resulting in the destruction of the ozone layer.

Ozone is critical to the Earth's atmosphere because it helps protect it from the sun's harmful ultraviolet radiation. Ozone depletion exposes the planet to harmful UV radiation, which has been linked to skin cancer, cataracts, and other health problems.

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Sarah discovered that the proportion of O2 in the ocean differs based on the water temperature. Some parts of the ocean have more dissolved O2, while other parts have less.

Sarah recently learned that the proportion of O2 found in the ocean differs based on the water temperature. Specifically, she found out that parts of the ocean have a higher quantity of dissolved O2, while other parts have a lesser quantity of it. This means that the amount of O2 present in the ocean can vary depending on the temperature of the water.

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The statistic that provides a better indication of the overall location (centre) of the distribution of CO2 emissions in 2020 is the total CO2 emissions by country.

To determine the overall location or center of the distribution of CO2 emissions, it is crucial to consider the total CO2 emissions by country rather than just the number of countries or their consumption of fossil fuels. The main reason for this is that most of the world's CO2 emissions come from a relatively small number of countries that have high levels of industrial activity and large populations.

When we examine the total CO2 emissions by country, we can identify the countries that contribute the most to global emissions. These countries typically have extensive industrial sectors, rely heavily on fossil fuels for energy production, and have large populations. By focusing on the total emissions, we can gain a more accurate understanding of the distribution of CO2 emissions worldwide.

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If the temperature drops, an endothemic response is occurring.

endothermic

As a result, dissolving table salt in water is endothermic. The only chemical reaction that can be either exothermic or endothermic is the dissolving of salts in water.

Exothermic or endothermic dissolving of a salt depends on which of the two energies, lattice or hydration, is larger. The quantity of energy released per unit of salt is often expressed in terms of kilocalories per mole (kcal/mol) or kilojoules per mole (kJ/mol).

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