HCO3− + H2S → H2CO3 + HS−
In the reaction above, what is the Bronsted-Lowry acid?

Answer:

Table salt

Explanation:

Is most soluble in water

The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.

Time required for the whole radioactive decay of any substance will be calculated by using the below link:

T = (n)(t), where

Initial mass of Carbon-14 = 120g

Final mass of Carbon-14 = 112.5g

Left mass = 120 - 112 = 7.5g

Number of required half life for this will be:

4 half lives are required, now on putting values we get

T = (4)(5730) = 22,920 years

Hence required time for the decay is 22,920 years.

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Answer:

Mass is an extensive physical property, it depends on the amount of matter being measured. It is physical because it can be measured without changing a substance's chemical identity.

Answer:

because the gravity of the ball can't go that high

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, some energy is lost  to the environment as sound or heat.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. As the ball impacted the ground, the energy would have been lost to the environment as sound or heat.

Therefore, some energy is lost  to the environment as sound or heat.

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A gas has a capacity of 34 litres and a temp of 35°C, when it once had a quantity of 28, a temperature of 45°A, and an unknown pressure.

A pressure unit is what?

The Metric unit of pressure, the pascal (abbreviated as Pa), is equal to one thomas per sq meter (Y e or kg m-1s-2). Surprisingly, this name was chosen in 1971.

How is pressure measured?

P = F / A, or force per unit of surface area, is the formula for computing pressure. The sign for pressures in physical science is p, and the SI-derived unit for measuring pressure is the pascal (symbol: Pa). One pascal is equal to one Newton per square meter of force applied perpendicularly on a surface.

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pCa when 35 mL of 0.009 M Cat2 is titrated with 0.022 M EDTA = 8.442. Balanced chemical equation when EDTA is added to the Ca²⁺ solution, the equation is shown below: Ca²⁺+ EDTA⁴⁻ → CaEDTA²⁻.  Hence, the correct option is d)10.6

Calculation of pСa  when 35 mL of 0.009 M Cat2 is titrated with 0.022 M EDTA (as for EDTA at pH=10 is 0.35) in a solution buffered to a constant pH= 10 when the volume of EDTA added is 48 mL is shown below: Given, Volume of Ca2+ = 35 ml

Concentration of Ca²⁺ = 0.009 M, Volume of EDTA added = 48 ml

Concentration of EDTA = 0.022 M,

pH = 10KCaY-2

= 5.0 x 10¹⁰

To calculate the pCa we have to follow these steps:

First, write down the balanced chemical equation for the reaction that occurs when EDTA is added to the Ca²⁺ solution, the equation is shown below: Ca²⁺+ EDTA⁴⁻ → CaEDTA²⁻

Kf = [CaEDTA²⁻] / ([Ca²⁺] [EDTA⁴⁻])

Initial concentration of Ca²⁺ = 0.009 M

Initial volume of Ca²⁺ = 35 ml, Initial amount of Ca²⁺ = 0.009 × 35

= 0.315 mmol

Final volume of Ca²⁺ = 35 + 48

= 83 ml

Thus, final concentration of Ca²⁺ = 0.315 / 83

= 0.003795 M

In the presence of excess EDTA, the entire amount of Ca²⁺ reacts with EDTA.

Thus,[EDTA⁴⁻] = 0.022 × 48 / 1000

= 0.001056 mol[Ca²⁺]

= 0.003795 mol,

Kf = 5 × 10¹⁰

We have to calculate the [CaEDTA²⁻] at the end point and then convert it into [Ca²⁺] to calculate pCa. Using the equation of equilibrium constant ;Kf = [CaEDTA²⁻] / ([Ca²⁺] [EDTA⁴⁻])

Here,[CaEDTA²⁻] = unknown[Ca²⁺]

= 0[EDTA]

= 0.001056 mol/L

When the end point is reached, all Ca²⁺ is reacted with EDTA to form CaEDTA²⁻.

Thus, moles of EDTA⁴⁻ used = 0.003795 × 83

= 0.315 mmol

Moles of CaEDTA²⁻ formed = 0.315 mmol

Thus, [CaEDTA²⁻] = moles of CaEDTA²⁻ formed / volume

= 0.315 / 83

= 0.003795 M

Now, substituting these values in the equilibrium constant expression;5 × 10¹⁰ = [0.003795] / [(0.001056) (0)]

Thus, [Ca²⁺] = [CaEDTA²⁻]

= 3.607 × 10⁻⁹ M

We know that pCa = -log [Ca²⁺]

Thus, pCa = -log 3.607 × 10⁻⁹

= 8.442 (approx)

Hence, the correct option is d)10.6

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The provision that the seller will release Jacob from any obligation if he loses his job is a contingency provision.

The provision that the seller will release Jacob from any obligation if he loses his job is a contingency provision. Contingency provisions are clauses included in a contract that specify certain conditions or events that must occur in order for the contract to be fulfilled or terminated. In this case, the contingency provision states that if Jacob loses his job, the seller will release him from any obligation under the contract. It is important to note that contingency provisions must be clearly defined and agreed upon by all parties involved in the contract. This type of provision can help to protect both the buyer and the seller in situations where unexpected circumstances arise. Overall, contingency provisions are a valuable tool for managing risk and ensuring that contractual obligations are met.

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Answer:I’m not sure but I believe it’s c

Explanation:

Given :

Energy in one slice of bread , e = 50 kcal .

A 1- lb loaf of bread contains 18 slices .

1 cal = 4.18 J .

To Find :

How many Joules of energy are obtained by eating 1.00 g of bread .

Solution :

We know , 1 lb = 0.45 kg = 450 g .

So , mass of 1 slice bread in gram is :

\(m=\dfrac{450}{18}\\\\m=25 \ g\)

So , 25 g bread contains 50 kcal of energy .

Energy in 1 g of bread is :

\(c=\dfrac{50}{25}\\\\c=2\ kcal\)

Therefore , energy in joules is \(2\times 4.18\ J=8.36\ J\) .

Hence , this is the required solution .

Answer: Reactant

Explanation:

In simple wording, Water act as a reactant and it broke or we can say split the larger molecule in the smaller ones, The H and OH bonds are attached to the two products that are formed after the reaction. Another process in which water is used as an important reactant is photosynthesis.

Answer:

Pls type your question in another manner cos I really cant decipher what you wrote the way you typed this pls

Answer:

pls writ question well

Explanation:

I don't get

Answer:

B)10.0 dm3

Explanation:

Now we have to apply Gay-Lussac's law which states that gases combine in simple volumes provided the temperature and pressure remain constant.

                                               2NO(g) + O2(g) ------>2NO

combining volumes                2            :   1               :  2

Volumes before reaction       8.0            6.0               0.0

Reacting volumes                   8.0            4.0                8.0

Volumes after reaction           -                 2.0              8.0

Therefore;

Total volume after reaction = 2.0 + 8.0 = 10.0 dm^3

The volume of the mixture after the reaction is  10 dm³

The correct answer to the question is Option B. 10 dm³

The above is simply a demonstration of Gay-Lussac' law. The volume of the mixture after the reaction can be obtained as follow:

                            2NO(g) + O₂ —> 2NO(g)

Combining Vol:   2 dm³  :  1 dm³   :  2 dm³

Before reaction:  8 dm³  :  6 dm³  :  0

During reaction:  8 dm³  :  4 dm³  :  8 dm³

After reaction:    0 dm³  :  2 dm³ :  8 dm³

The Volume after the reaction = 2 + 8 = 10 dm³

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Answer:

its will be 4 (B) I m not sure hope that help

Answer:

i think it might be C if not im sorry pls give brainliest.. but yea im pretty sure its C

Explanation:

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (1 mole C / 1 mole CO2) = 15.0 moles of C

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (2 moles O / 1 mole CO2) = 30.0 moles of O

Calcium Chloride: CaCl2

Formula: Ca + 2Cl

23.0 moles of CaCl2 contains (23.0 moles CaCl2) x (1 mole Cl / 2 moles Cl) = 11.5 moles of Cl

Sulfur Dioxide: SO2

Formula: S + O2

295.0 grams of SO2 contains (295.0 grams SO2) x (1 mole S / 64.066 grams) = 4.6 moles of S

Potassium Sulfate: K2SO4

Formula: 2K + S + 4O

295.0 grams of K2SO4 contains (295.0 grams K2SO4) x (1 mole S / 174.259 grams) = 1.69 moles of S

Iron: Fe

Formula: Fe

565.0 grams of Fe contains (565.0 grams Fe) x (1 mole Fe / 55.845 grams) = 10.15 moles of Fe

metallic elements

SO2 is a covalent compound. It consists of one sulfur atom and two oxygen atoms joined together by covalent bonds, which are strong chemical bonds where electrons are shared between atoms.

H

|

O-H

A water molecule is polar because the electrons are not shared equally between the oxygen and hydrogen atoms. Oxygen is more electronegative than hydrogen, so it pulls the electrons closer to itself, creating a partial negative charge on the oxygen side of the molecule and a partial positive charge on the hydrogen side. This causes the molecule to have a dipole moment and makes the molecule polar.

NH3 (Ammonia) - the molecule is a pyramidal shape, which means that the Nitrogen is at the center and the three hydrogen atoms are located at the three corners of a pyramid.

H2O (Water) - the molecule is a V-shape, this shape is determined by the angle between the two bonding pairs and the two non-bonding pairs of electrons.

CH4 (Methane) - the molecule is tetrahedral shape, the carbon is in the center, and the four hydrogen atoms surround the carbon in a tetrahedral arrangement.

A color change

The formation of a precipitate

The evolution of a gas

A change in temperature

Uday Tahlan

The naturally occurring the element x exists in three isotopic forms. The average atomic weight of x 28.544 amu.

Given that :

x- 28, Abundance % = 67.14 % = 0.6714

The atomic mass = 27.343 amu

x-29, Abundance % = 10.50 % = 0.1050

The atomic mass = 28.889 amu

x- 32, Abundance %  = 22.36 % = 0.2236

The atomic mass = 31.993 amu

The average atomic weight = ( 27.343 × 0.6714 ) + ( 28.889 × 0.1050) +

                                                          ( 31.993 × 0.2236)

                                                 = 18.358 + 3.0333 + 7.153

                                                 = 28.544 amu

Thus, the average atomic weight of naturally occurring element x exists in three isotopic forms 28.544 amu.

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Answer:

Cobalt chloride papers are often used as humidity indicators because they change color in response to the relative humidity of the air. When the air is dry, the cobalt chloride paper is blue or purple. As the air becomes more humid, the paper turns pink or red. The color change is reversible, meaning that the paper will return to its original color as the humidity decreases.

Answer:

1. Element - a substance that is made from only one type of atom

An element is made up of only one type of atoms and known for its unique properties than other elements.

2. Heterogeneous -  composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture

3.Homogenous - even distribution of parts throughout the whole mixture; not easily separated into individual components.

4. Product - the substance created as a result of a chemical reaction

Products are the final substance that created as a result of a chemical reaction.

5. Reactant - one of the starting substances (ingredients) that is involved in a chemical reaction

Reactants are the starting substance that takes part in a chemical reaction.

6. Solute - the substance that is being dissolved.

A Solute is a substance that is being dissolved in the solvent to make a solution.

7. Solvent - the substance that does the dissolving

A solvent is the medium in which the solute is being dissolved to make the solution.

A homogeneous mixture, like a solution, has an even distribution of its components throughout the whole mixture. It is not easily separated into individual components. On the other hand, a heterogeneous mixture, like a mixture of oil and water, has dissimilar parts that can be separated easily, and the components are unevenly distributed in the mixture.

1. Reactant: one of the starting substances (ingredients) that is involved in a chemical reaction.
2. Solvent: the substance that does the dissolving.
3. Solute: the substance that is dissolved.
4. Homogeneous: even distribution of parts throughout the whole mixture; not easily separated into individual components.
5. Heterogeneous: composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.
6. Element: a substance that is made from only one type of atom.
7. Product: the substance created as a result of a chemical reaction.

Let's match the terms to their definitions:

1. Element: A substance that is made from only one type of atom.
2. Reactant: One of the starting substances (ingredients) that is involved in a chemical reaction.
3. Product: The substance created as a result of a chemical reaction.
4. Solute: The substance that is dissolved.
5. Solvent: The substance that does the dissolving.
6. Homogeneous: Even distribution of parts throughout the whole mixture; not easily separated into individual components.
7. Heterogeneous: Composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.

For example, if we consider the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), hydrogen gas and oxygen gas would be the reactants. Water would be the product. In this reaction, hydrogen gas and oxygen gas are the starting substances that undergo a chemical reaction to form water.

In a solution, such as saltwater, the salt (solute) dissolves in the water (solvent). The salt is the substance that is dissolved, and the water is the substance that does the dissolving.

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The time required to plate 2.08 g of copper at a constant current flow of 1.26 A is approximately 2,501.75 seconds (or 41.70 minutes).

To determine the time required to plate 2.08 g of copper at a constant current flow of 1.26 A (amperes), we can use Faraday's law of electrolysis. Faraday's law states that the amount of substance (in moles) deposited or liberated during electrolysis is directly proportional to the electric current and the time.

The equation to calculate the amount of substance (in moles) is given by:

moles of substance = (current in amperes * time in seconds) / (Faraday's constant)

The Faraday's constant is the charge carried by one mole of electrons and has a value of approximately 96,485 C/mol.

First, let's convert the mass of copper (2.08 g) to moles using its molar mass. The molar mass of copper (Cu) is 63.55 g/mol.

moles of Cu = (mass of Cu) / (molar mass of Cu)

moles of Cu = 2.08 g / 63.55 g/mol

moles of Cu = 0.0327 mol

Next, we can rearrange the formula to solve for time:

time = (moles of substance * Faraday's constant) / (current)

time = (0.0327 mol * 96,485 C/mol) / (1.26 A)

time = 3,152.95 C / 1.26 A

time ≈ 2,501.75 s

Therefore, the time required to plate 2.08 g of copper at a constant current flow of 1.26 A is approximately 2,501.75 seconds (or 41.70 minutes).

It's important to note that this calculation assumes 100% efficiency in the electroplating process and does not consider factors such as resistance, efficiency of the electroplating cell, or other potential sources of loss.

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When 259 ml of a 0.860 M NaCl solution is mixed with 552 ml of a 0.350 M NaCl solution, the concentration of NaCl will be 0.496 M.

NaCl is the chemical formula for sodium chloride, which is a salt consisting of sodium ions and chloride ions. It is commonly referred to as table salt and is commonly used as a seasoning in cooking and a preservative in food processing.

Concentration refers to the amount of solute that is dissolved in a given amount of solvent or solution. It is generally measured in molarity (M), which is defined as the number of moles of solute per liter of solution. The equation for calculating molarity is as follows:

Steps to find out the NaCl concentration:

Given that 259 ml of a 0.860 M NaCl solution is mixed with 552 ml of a 0.350 M NaCl solution.

First, find the moles of NaCl in the first solution (259 ml of 0.860 M NaCl).

0.860 M means there are 0.860 moles of NaCl for every liter of solution.

In 259 ml (0.259 L) of this solution, there will be:

moles of NaCl = 0.860 M × 0.259 L = 0.22294 mol NaCl

Next, find the moles of NaCl in the second solution (552 ml of 0.350 M NaCl).

0.350 M means there are 0.350 moles of NaCl for every liter of solution.

In 552 ml (0.552 L) of this solution, there will be:

moles of NaCl = 0.350 M × 0.552 L = 0.1932 mol NaCl

Total moles of NaCl in the final solution = 0.22294 mol + 0.1932 mol = 0.41614 mol NaCl

Finally, calculate the molarity of the final solution (which is the concentration of NaCl):

Molarity = moles of NaCl / liters of solutionThe total volume of the final solution is 259 ml + 552 ml = 811 ml or 0.811 L.

Molarity = 0.41614 mol / 0.811 L = 0.513 M NaCl

Therefore, when 259 ml of a 0.860 M NaCl solution is mixed with 552 ml of a 0.350 M NaCl solution, the concentration of NaCl will be 0.496 M.

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Answer:

the answer is diamond and graphite

Answer:

Appearance: Water is a colourless, odourless and tasteless liquid in its natural state. The crystal structure of water is hexagonal.

Density: The density of water is about 1 gm/cc and it varies with temperature in an undefined pattern. In solid state, the density remains close to 0.9gm/cc.

Viscosity: Viscosity is explained by the resistance to deformation at a given rate. In other words, the thickness of the liquid - eg, syrup or water. Viscosity of water is 0.89 cP.

Explanation:

The fluoride ion is frequently utilized in organic nucleophilic processes as both a nucleophile and a leaving group, particularly in arene chemistry.

A functional group within another molecule that lacks electrons is replaced by an electron-rich chemical species in a chemical reaction known as a nucleophilic substitution. The substrate is the molecule that consists of the electrophile and the leaving functional group.

An important family of reactions that enable the interconversion of functional groups is nucleophilic substitution reactions. By using the tosylates (R-OTs), a different way of converting the -OH to a better leaving group, the variety of substitution reactions that are conceivable for alcohols can be expanded.

In polar protic fluids, the fluoride ion F is typically not a nucleophilic species. It is an extremely potent H-bond acceptor because it is the smallest single anion with the biggest negative charge. Its poor polarizability and these characteristics make it a weak nucleophilic species in protic liquids.

You don't interact with the solvent as much while you're in an aprotic solvent. Finally, fluoride is actually the best nucleophile in this circumstance, followed by chloride, bromide, then iodide. So you're moving toward simplicity in this situation.

Since fluorine is the smallest atom and atom size is more important than electronegativity when evaluating the stability of atoms in the same column, fluorine is the most nucleophilic element in polar aprotic solvent. Being the smallest, although being the most electronegative, it is also the least stable and most nucleophilic.

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The equilibrium constant for this reaction is 1.65.

Solution:

X2: 3, Y2: 6, XY: 7

X₂ + Y₂ ⇌ 2XY

Kc = [XY]² / [X₂][Y₂] = [7]²/[3][6] = 2.72

1mole of equation √(2.72) = 1.65

The equilibrium constant of a chemical reaction is the value of the reaction quotient in chemical equilibrium the state to which a dynamic chemical system approaches when, after sufficient time, its composition exhibits no further measurable tendency to change. Q is the quantity that changes as the reaction system approaches equilibrium. K is the numerical value of Q at the end of the reaction when equilibrium is reached.

Balance Example A book on a table. A car that moves at a constant speed. A chemical reaction in which the forward and reverse kinetics are equal. The specific rate constant k is a constant of proportionality that relates reaction rate to reactant concentration. The rate laws and specific rate constants of chemical reactions must be determined experimentally. The value of the rate constant is temperature dependent.

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Answer:

According to Thompson's model, Every atom consists of a positively charged sphere of radius 10-- 10m in which entire mass and positive charge of the atom are uniformly distributed inside the sphere electrons are embedded like seeds in watermelon. According Rutherford entire poistive charge and mass of the atom are concentrated in a tiny central core of the atom which is called atomic nucleus contains. Size of nucleus = 10-- 15m. The nucleus contains protons and neutrons. Negatively charged electrons revolve around the nucleus in circular orbits.

Explanation:

Answer:

A

Explanation:

Answer: 51 g

Explanation:

The final concentration of the solution after dilution to 50000 ml  will be 0.224 M.

To find the concentration of the solution after dilution, you can use the formula:

C1 * V1 = C2 * V2

Where C1 is the initial concentration of the solution, V1 is the initial volume, C2 is the final concentration of the solution after dilution, and V2 is the final volume after dilution.

In this case, C1 = 8 M and V1 = 7000 ml = 7 L

V2 = 50000 ml = 50 L

So, we can substitute these values in the equation to find the final concentration:

C2 = (C1 * V1) / V2 = (8 M * 7 L) / 50 L = 0.224 M

So, the final concentration of the solution after dilution will be 0.224 M.

The process of dilution involves increasing the volume of a solution while maintaining the same number of solute particles. The concentration of the solution decreases as the volume increases. To calculate the concentration of a solution after dilution, you can use the formula C1 * V1 = C2 * V2. In this formula, C1 is the initial concentration of the solution, V1 is the initial volume, C2 is the final concentration of the solution after dilution, and V2 is the final volume after dilution. By substituting the given values, you can find the final concentration of the solution. The process of dilution is useful in many applications, including adjusting the strength of chemicals for specific uses, preparing samples for analysis, and controlling the reaction rate in chemical reactions.

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Ne has the least powerful London dispersion forces when compared to O2 (LDF). This is due to the fact that London dispersion forces depend on the molecule's number of electrons, and

LDF, sometimes referred to as van der Waals forces or London dispersion forces, are inter molecular forces which exist between molecules. These forces are brought on by transient dipoles formed in nonpolar molecules as a result of an asymmetric electron distribution.

Although LDF are the weakest kind of intermolecular force, they nonetheless have a significant impact on how nonpolar substances behave physically, including how hot they can melt and boil. Because larger particles have much more electrons that can temporarily form dipoles, these forces get stronger as molecule size increases.

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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: