Calculate the pH of 0.65 M H2SO4 (sulfuric acid) solution? (Ka2: 1.1x10-2)

Answer:

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

d. 93 degree Celsius

Explanation:

Plzzzzzzzzzzzzzzzzzzzzzzz mark AS BRAINLIST

The statement that is true is that It is endothermic and DH equals +91.8 kJ.

We can see that in this case that the heat of the reaction which we cam also call the enthalpy of the reaction is positive. Let us know that when we have a positive enthalpy what we have is an endothermic reaction.

Endothermic reactions are typically observed as a decrease in temperature, as energy is absorbed from the surroundings to fuel the reaction. Examples of endothermic reactions include the melting of ice.

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Missing parts;

Given the balanced equation representing a reaction at 101.3 kPa and 298 K:

N2(g) + 3H2(g) => 2NH3(g) + 91.8 kJ

Which statement is true about this reaction?

(1) It is exothermic and DH equals -91.8 kJ.

(2) It is exothermic and DH equals +91.8 kJ.

(3) It is endothermic and DH equals -91.8 kJ.

(4) It is endothermic and DH equals +91.8 kJ.

The partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg (calculated by subtracting the partial pressure of water, 17.0 mm Hg, from the total atmospheric pressure, 750.0 mm Hg).

When a gas is collected over water, the presence of water vapor affects the total pressure observed. In this case, the total atmospheric pressure is given as 750.0 mm Hg, and the partial pressure of water vapor at 19.5°C is 17.0 mm Hg.

To determine the partial pressure of hydrogen, we need to subtract the partial pressure of water vapor from the total atmospheric pressure. Partial pressure refers to the pressure exerted by an individual gas component in a mixture. In this scenario, the collected gas is primarily hydrogen, with water vapor being the other component.

By subtracting the partial pressure of water vapor (17.0 mm Hg) from the total atmospheric pressure (750.0 mm Hg), we can find the partial pressure of hydrogen:

Partial pressure of hydrogen = Total atmospheric pressure - Partial pressure of water vapor

Partial pressure of hydrogen = 750.0 mm Hg - 17.0 mm Hg

Partial pressure of hydrogen = 733.0 mm Hg

Therefore, the partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg.

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Answer:

3.15 V

Explanation:

Step 1: Write the balanced cell reaction

Co(s) + F₂(g) ⟶ Co²⁺(aq) + 2 F⁻(aq)

Step 2: Identify both half-reactions:

Cathode (reduction): F₂(g) + 2 e⁻ ⟶ 2 F⁻(aq)    E°red = 2.87 V

Anode (oxidation): Co(s) ⟶ Co²⁺(aq) + 2 e⁻      E°red = -0.28 V

Step 2: Calculate the standard cell potential

We will use the following expression.

E°cell = E°red,cathode - E°red,anode

E°cell = 2.87 V - (-0.28 V) = 3.15 V

Given E°cell > 0, the reaction is spontaneous.

Taking into account the definition of standard cell potential, E°cell has a value of 3.15 V.

The balanced cell reaction is:

Co(s) + F₂(g) ⟶ Co²⁺(aq) + 2 F⁻(aq)

First of all, it must be taken into account that oxidation is a reaction where an atom, ion or molecule loses electrons while reduction corresponds to the gain of electrons from an atom, ion or molecule.

Both oxidation and reduction depend on the change in the oxidation state of the atom, that is, on the difference in the charge of the atom in a reaction.

The oxidation and reduction reactions always occur simultaneously for what are generally known as oxidation-reduction reactions or redox reactions.

So, the anode corresponds to the negative electrode which normally oxidizes in the electrolytic chemical reaction while the cathode corresponds to the positive electrode which normally reduces its oxidation state when it receives electrons.

Si, in this case, the both half-reactions will be:

The potential of an Ecel cell is a measure of the difference in electronic energy between the two electrodes. The electronic energy of each electrode is related to the force with which the reaction occurs at the electrode-solution interface. The unit in which it is measured is the volt.

In electrochemistry, because a cell reaction is made up of two half-cell reactions, each of which has a characteristic electrode potential, the potentials measure the driving force of the two half-reactions.

The cell potential is obtained by subtracting the potentials of both half cells as shown below:

E°cell= Ecatode - Eanode

So, in this case, the Ecell is calculated as:

E°cell = 2.87 V - (-0.28 V) = 3.15 V

In summary, E°cell has a value of 3.15 V.

Learn more:

Increasing the concentration of CO  decreases the equilibrium  concentration of oxygen and increases the concentration of CO₂, increasing the concentration of CO₂ increases the concentration of CO and O₂.

Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.

It is the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. While a reaction is in equilibrium the concentration of the reactants and products are constant.

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Answer:

C: 0.78 V

Explanation:

The Cr2O7 cell has a higher reduction potential, so it will be reduced (as it is a better oxidizing agent). This means that Fe will be oxidized. Its oxidation potential is simply the negative of its reduction potential, 0.45: \(E_{ox}=-0.45\). We know that cell potential is the sum of the reduction and oxidation potentials of each reaction (it is not an extensive property like enthalpy or entropy, so we don't need to worry about multiplying anything). Therefore, \(E_{cell}=(-0.45+1.23)V=0.78V\).

Answer:

115.6 kJ/mol

Explanation:

The ΔG of a reaction can be calculated using the following equation:

ΔG = ΔG° + RT ln(Q)

where:

ΔG° is the standard free energy change, which is given as 137.0 kJ/mol in this case

R is the gas constant, which is 8.314 J/(mol·K)

T is the temperature in Kelvin, which is 25°C + 273.15 = 298.15 K

Q is the reaction quotient, which is the ratio of the concentrations of the products to the concentrations of the reactants, each raised to their stoichiometric coefficients.

From the chemical equation given, the stoichiometric coefficients of Mg2+ and PO43- are 3 and 2 respectively. Therefore, the reaction quotient can be expressed as:

Q = [Mg2+]^3 [PO43-]^2

Substituting the given initial concentrations of Mg2+ and PO43- into the reaction quotient expression, we get:

Q = (0.65 M)^3 (0.43 M)^2 = 0.011 M^5

Now we can calculate the ΔG of the reaction:

ΔG = ΔG° + RT ln(Q)

ΔG = (137.0 kJ/mol) + (8.314 J/(mol·K) × 298.15 K) × ln(0.011 M^5)

ΔG = 137.0 kJ/mol - 21.38 kJ/mol

ΔG = 115.6 kJ/mol

Therefore, the ΔG for the reaction at 25°C and the given initial concentrations of Mg2+ and PO43- is 115.6 kJ/mol.

The molecules that assists deoxyribonucleic acid (DNA) in its organization is the proteins. That is option A.

Deoxyribonucleic acid (DNA) is defined as the hereditary molecules in a living organism that stores instructions for making other large molecules which are inherited from the parent.

In the structure of the deoxyribonucleic acid, they are made made up of base pairs that are organised by proteins known as histones.

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Answer:

Anode

Explanation:

In the electrolysis of acidified water;

Anode half reaction;

4OH^-(aq)-----> 2H2O(l) + O2(g) + 4e

Cathode half reaction;

4H^+(aq) + 4e ----> 2H2(g)

Phenolphthalein has a pink colour in a neutral medium. A neutral medium in this electrolysis is one in which the hydroxide ion is reduced to water and oxygen and this occurs at the anode hence this is the electrode around which the solution will turn pink.

Before the pH drops below 7.0, the buffering mechanism in blood can neutralise 1.26 kg of HCl.

(a) The equilibrium expression for the reaction between H₂CO₃ and HCO₃₋ is:

H₂CO₃ ↔ H+ + HCO₃₋

The pKa for H2CO3 at body temperature is 6.1, so the pH of blood plasma can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([HCO₃₋]/[H₂CO₃])

pH = 6.1 + log(0.024/0.0012)

pH = 7.4

Therefore, the pH of blood plasma is 7.4.

(b) The buffering capacity of blood can be calculated using the equation:

buffering capacity = Δ[HCO₃₋]/ΔpH

ΔpH is the change in pH that can be tolerated before the buffering system is overwhelmed. The buffering capacity of blood is highest at a pH of 7.4, which is the normal pH of blood plasma. Therefore, we will use a pH range of 7.4 ± 0.6 (i.e., from 6.8 to 8.0) to calculate the buffering capacity.

At pH 6.8, the [H+] is 10 times higher than at pH 7.4, so [H+] = 10^-6.8 = 1.58 × 10^-7 M.

At pH 8.0, the [H+] is 10 times lower than at pH 7.4, so [H+] = 10^-8.0 = 1.00 × 10^-8 M.

The change in [HCO3-] can be calculated using the Henderson-Hasselbalch equation:

[HCO₃₋] = [H₂CO₃]/(1 + 10^(pH-pKa))

At pH 6.8:

[HCO₃₋] = 0.0012/(1 + 10^(6.8-6.1)) = 0.0006 M

At pH 8.0:

[HCO₃₋] = 0.0012/(1 + 10^(8.0-6.1)) = 0.011 M

Δ[HCO₃₋] = 0.011 - 0.0006 = 0.0104 M

Therefore, the buffering capacity of blood is:

buffering capacity = 0.0104/0.6 = 0.0173 M/pH

The amount of HCl that can be neutralized before the pH falls below 7.0 can be calculated using the buffering capacity:

[H+] = 10⁻⁷ = 1.00 × 10⁻⁷ M

Δ[HCO₃₋] = buffering capacity × ΔpH = 0.0173 × (7.4 - 7.0) = 0.0069 M

The amount of HCl that can be neutralized is:

mass of HCl = Δ[HCO₃₋] × volume of blood × molar mass of HCl

mass of HCl = 0.0069 × 5.0 × 10^3 × 36.5 = 1.26 × 10³ g

Therefore, the buffering system in blood can neutralize 1.26 kg of HCl before the pH falls below 7.0.

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The sequences were already outlined therefore she didn't have any difficulty in choosing between math and poetry.

A sequence is an orderly arrangement of events or objects. When objects or events are arranged in a sequence, decision making becomes much easier.

For the task at hand, since the sequences were already outlined, then she didn't have any difficulty in choosing between math and poetry.

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Answer:

to solve an equation

The answer fam is.......

Different land forms have different combinations of elevation and relief.

Elevation is the height of a feature above sea level.

Relief is the difference between the highest and lowest points in an area.

Answer:

B. the number of protons added to the number of neutrons in the nucleus.

Explanation:

Sana makatulong

Answer:

C: An organic acid produced by rotting vegetation makes holes in rocks Process

Explanation:

In chemical weathering , weathering process occurs due to chemical reaction . When organic acid produced by rotting vegetation makes holes in rocks , chemical reaction takes place between acid and rock which results in the formation of new product . Hence it is an example of chemical weathering .

In all the rest of options , weathering is due to physical process .

Answer:

\( \huge{ \boxed{111.30 \: \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L} \\ }\)

where

n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities.

From the question.

N = 6.7 × 10²⁵ \( \: H_2SO_4 \: \) molecules

\(n = \frac{6.7 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 111.2956...\)

We have the final answer as.

The mass of FeSO4*7H2O in the sample is 1.21 grams.

Calculate moles of Fe2O3

moles of Fe2O3 = mass of Fe2O3 / Molar mass of Fe2O3

moles of Fe2O3 = 0.348 grams / 159.69 g/mole = 0.00218 moles

Calculate moles of Fe

4 Fe + 3O2 → 2Fe2O3

For 4 moles of Fe consumed there is 2 moles of Fe2O3 produced

This means it has a ratio 2:1

So 0.00218 moles of Fe2O3 produced , there is 2*0.00218 = 0.00436 moles of Fe consumed

Calculate moles of FeSO4*7H2O

Fe + H2SO4 + 7H2O → FeSO4*7H20 + H2

For 1 mole of Fe consumed there is 1 mole of FeSO4*7H2O produced

This means for 0.00436 moles there is 0.00436 moles of Fe2SO4*H2O produced

Calculate the mass of FeSO4*7H2O in the sample

mass of FeSO4*7H2O = 0.00436 moles * 278.01 g/mole = 1.212 g

The mass of FeSO4*7H2O in the sample is 1.21 grams.

Complete question: A powder contains FeSO4⋅7H2O (molar mass=278.01 g/mol), among other components. A 3.930 g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe3+. The addition of NH3 precipitated Fe2O3⋅xH2O, which was subsequently ignited to produce 0.348 g Fe2O3. What was the mass of FeSO4⋅7H2O in the 3.930 g sample?

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Answer:

545

Explanation:

If we let the unknown temperature in Kelvin be x,

\( \frac{0.376 \times 580.3}{43+273} = \frac{0.415 \times 907.1}{x} \\ \\ x = 545\)

Answer:

C i took that test and got 96

Explanation:

Answer:

This evidence includes fossilized bones, teeth, eggs, footprints, teeth marks, and even dung. When paleontologists compare a skeleton of a living bird to the fossilized skeleton of a non-bird theropod, like Sinornithosaurus, they see many similarities.

Explanation:

Answer:

When people think of dinosaurs, two types generally come to mind. There were the huge herbivores,

like Apatosaurus, with their small heads and long tails. There were also those fearsome carnivores,

like Tyrannosaurus rex, that walked on two legs and had a mouthful of teeth like kitchen knives.

Living Dinosaurs

These large dinosaurs are no longer around, but dinosaurs still live among us today. They are the

birds. It's difficult to imagine that a bird on your window sill and a T. rex have anything in common.

One weighs less than a pound. The other was the size of a school bus, tipping the scales at eight

tons. But for all their differences, the two are more similar than you might think. In fact, birds and T.

rex are close relatives. They all belong to a group of dinosaurs called theropods.

This is a cladogram, a "" showing the relationships among organisms. The group called dinosaurs includes the extinct dinosaurs

and all their living descendants. All its members, including living birds, descended from the very first dinosaur-their common ancestor.

That's why birds are a kind of dinosaur (just as humans are a kind of primate).

Skeletal Evidence

When paleontologists compare a skeleton of a living bird to the

fossilized skeleton of a non-bird theropod, like Sinornithosaurus,

they see many similarities. They both have a hole in the hipbone, a

feature that distinguishes most dinosaurs from all other animals.

This feature allows an animal to stand erect, with its legs directly

beneath its body. All theropod dinosaurs, including birds, have a

furcula, also known as a wishbone. Another shared characteristic is the presence of hollow bones.

Hollow bones reduce the weight carried by an animal. This feature enables the animal to run faster. It

probably also played a role in the evolution of flight.

thought to have evolved for flight. The discovery of more and more non-flying dinosaurs with feathers

disproved that explanation. For these dinosaurs, feathers may have served other functions, like

gliding, insulation, protection, and display. Feathers play that same role in many bird species today.

Based on the evidence of shared characteristics, scientists have concluded that birds are a type of

Birds are the only dinosaurs with the ability to fly. This is

very interesting to scientists who want to know when the

capability of flight emerged. To find out, some scientists

study the brains of bird and non-bird dinosaurs. Soft

tissue, such as brains, is almost never preserved in the

fossil record. What is preserved is the imprint the brain

left on the inside of the skull. Now scientists are using

computed tomography (CT) scanners to create

endocasts. These are detailed, three-dimensional

reconstructions of the interiors of fossilized skulls.

In a recent study, researchers were able to peer inside

the braincases of more than two dozen specimens.

"Technology allows us to look inside these specimens

without destroying them," says Dr. Amy Balanoff, a

Museum research associate. "It's a non-destructive way

to basically slice up a dinosaur brain. We look inside and see what it can tell us about the evolution of

the brain within dinosaurs. Most of us grew up thinking that dinosaurs had tiny brains, but actually

some had really big brains."

The endocasts allow Balanoff and other researchers to

explore the outer shape of the brain in more detail. In

addition, the casts also provide new information about

the volume and shape of different regions of the brain.

For example, scientists looked at a detailed view of the

dinosaur cerebrum, a region of the brain related to

cognition and coordination. They found that this region

was very large in non-bird dinosaurs closely related to

birds. Dr. Balanoff's research suggests that these

dinosaurs developed big brains long before flight and that

these bigger brains prepared the way for them to fly.

When examining skeletal, behavioral, and brain

evidence, scientists see that birds and non-bird dinosaurs

share many features. This helped them conclude that

dinosaurs aren't extinct after all. They're living among us today.

(Im a really fast Typer and Thinker)

Have a nice day

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

The simplest alkanes have their C atoms bonded in a straight chain; these are called normal alkanes. They are named according to the number of C atoms in the chain.

Answer:

2.0kg

Explanation:

The mass of 7 red apples in kilograms is to be considered as the 1.16 kilograms.

Since the mass of a dozen apples is 2 kg.

we know that

1 dozen is 12 units

So the mass of 12 apples = 2kg

So mass of 1 apple = 2/12 = 1/6  kg

Now the mass of 7 apple is to be  

= 7/6 kg

= 1.16 kg

hence, The mass of 7 red apples in kilograms is to be considered as the 1.16 kilograms.

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Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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