why are the first and lasat dissociation reactions of phosphoric acid of no signigifance to ph buffering in cells

Explanation:

1.) 6Li + Al2(CO3)3 -----> 3Li2CO3 + 2Al

From the stoichiometry of the equation,

6 moles of Li reacts with 1 mole of Al2(CO3)3

x of Li will react with 1.64 moles of Al2(CO3)3

=> x = (1.64 × 6) ÷ 1

=> x = 9.84 moles of Li

2.) 2Mg + N2 -----> 2MgN

2 moles of Mg react completely with 14 g of N2

4.226 moles of Mg will react with x of N2

=> x = (4.226 × 14) ÷ 2

=> x = 29.582 g of N2

3.) 8Fe + S8 -----> 8FeS

256 g of Sulphur give 8(56 + 32)g of FeS

16 g of Sulphur will give x of FeS

=> x = (16 × 704) ÷ 256

=> x = 44 g of FeS

256 g of Sulphur react with 8(56)g of Fe

16 g of Sulphur will react with x of Fe

=> x = (16 × 8 × 56) ÷ 256

=> x = 28 g of Fe

4.) B2H6 + 3O2 -----> HBO2 + 2H2O

27.6 g of B2H6 burn in 3(32)g of O2

31.6 g of B2H6 will burn in x of O2

=> x = (31.6 × 3 × 32) ÷ 27.6

=> x = 109.9 g of O2

27.6 g of B2H6 produce 2 moles of H2O

12.8 g of B2H6 will produce x of H2O

=> x = (12.8 × 2) ÷ 27.6

=> x = 0.93 moles of H2O

The  stationary metal sphere can have kinetic energy by: The metal's molecules are moving around.

When you find a substance's temperature, you are measuring the "average kinetic energy of the particles in the substance." Temperature is a measure of the average kinetic energy of the particles (atoms or molecules) that make up a substance.

Kinetic energy is the energy an object possesses due to its motion. It is defined as the energy that a body possesses by virtue of being in motion. The amount of kinetic energy that an object has depends on its mass and its velocity. Mathematically, the kinetic energy of an object can be expressed as KE = (1/2)mv^2, where KE is the kinetic energy, m is the mass of the object, and v is its velocity.

Read more on kinetic energy here:https://brainly.com/question/8101588

#SPJ1

The Americans with Disabilities Act (ADA) was passed in the early 1990s, which helped Americans with disabilities with access to public venues.

The Americans with Disabilities Act (ADA) was passed in the early 1990s, specifically in 1990, to address the barriers and discrimination faced by individuals with disabilities. The ADA is a landmark civil rights law that provides comprehensive protection and ensures equal opportunities for people with disabilities in various aspects of life, including access to public venues. The ADA prohibits discrimination on the basis of disability in public accommodations, such as restaurants, theaters, hotels, stores, and other establishments that are open to the public. It requires these venues to make reasonable modifications to their policies, practices, and physical structures to ensure accessibility for individuals with disabilities. This includes installing ramps, accessible entrances, elevators, accessible restrooms, and other accommodations that enable people with disabilities to navigate and participate fully in public life.

The ADA has had a significant impact on the lives of Americans with disabilities by promoting inclusion and equal access. It has facilitated greater independence, improved employment opportunities, and enhanced overall participation in society. Through its enactment, the ADA has helped to create a more inclusive and accessible environment, breaking down barriers and fostering a society that values diversity and equal rights for all.

Learn more about Americans with Disabilities Act here:

https://brainly.com/question/30392203

#SPJ11

The mole fraction of the KOH is 0.025.

We know that the mole fraction is the ratio of the moles to the total number of moles.

Thus;

Number of moles of KOH =  56g/56 g/mol = 1 mol

Number of moles of water = 700.0g/18 g/mol = 39 moles

Now;

Mole fraction of KOH = 1 mol/1 mol + 39 moles = 1/40 = 0.025

Learn more about mole fraction:https://brainly.com/question/8076655

#SPJ1

Answer:

Non-polar

Explanation:

Non-polar bonds occur when the electrons in a covalent bond are equally shared between the two atoms.

The indicated bond is most likely non-polar because the two atoms are identical (both carbons). In addition, these two carbons are balanced (their other bonds are identical). This means there is no reason for the electrons in the bond to be pulled in any particular direction.

The net ionic equation for the reaction between copper(II) sulfate and ammonium hydroxide depends on whether a reaction occurs.

If a reaction occurs, the balanced net ionic equation will be provided. Otherwise, if no reaction occurs, the notation "nr" will be used to indicate no reaction.When copper(II) sulfate (CuSO4) and ammonium hydroxide (NH4OH) are mixed in aqueous solution, they may undergo a precipitation reaction if a reaction occurs.

In this case, the copper(II) ion (Cu2+) from copper(II) sulfate reacts with the hydroxide ion (OH-) from ammonium hydroxide to form a precipitate of copper(II) hydroxide (Cu(OH)2).The balanced net ionic equation for the reaction, assuming a precipitation occurs, is:

Cu2+ (aq) + 2 OH- (aq) → Cu(OH)2 (s)

On the other hand, if no reaction occurs, it means that there are no significant chemical changes taking place when the two solutions are mixed. In this case, the notation "nr" (no reaction) would be used to indicate that no reaction occurs.

It is important to note that the precise conditions, concentrations, and stoichiometric ratios of the reactants can influence whether a reaction occurs or not. Conducting the actual experiment and observing the formation or lack of formation of a precipitate would provide definitive evidence of whether a reaction takes place.

To learn more about ionic.

Click here:brainly.com/question/30373783

#SPJ11

Endothermic reactions require energy input in order to proceed, and this energy is usually in the form of d. chemical energy.

This can be in the form of bonds between molecules, or from heat energy, which causes molecules to move faster and react with one another. Endothermic reactions are the opposite of exothermic reactions, which release energy during the reaction.

Endothermic reactions are important in many industrial and chemical processes, such as the Haber process for producing ammonia, and the production of polyurethane foam.

Learn more about chemical energy at: https://brainly.com/question/5650115

#SPJ4

Answer:

The mass of oxygen needed to be pumped in the aquarium is 10 g

Explanation:

Here the value of the degree of solubility of oxygen in water is sought

The solubility of oxygen in fresh water is approximately 1.22 × 10⁻³ mol·dm⁻³ which is equivalent to approximately 40 mg/L

The volume of water the aquarium holds = 250 L

The mass of oxygen required = The solubility of oxygen in water × (The volume of water in the aquarium)

Therefore, the mass of oxygen needed to be pumped in the aquarium = 40 mg/L × 250 L = 10,000 mg

1,000 mg = 1 g

∴ 10,000 mg = 10 g

The mass of oxygen needed to be pumped in the aquarium = 10,000 mg = 10 g.

Answer:

I believe the answer is D

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, element D  has the highest effective nuclear charge.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

Mathematically,

Zeff = Z – S

Z=number of protons in nucleus

S=the average density between the nucleus and the electron.

Since figure d has the highest number of electrons which is equals to protons. So, element D has the highest effective nuclear charge.

Therefore, element D  has the highest effective nuclear charge.

To know more about element, here:

https://brainly.com/question/8460633

#SPJ2

The respective hybridization of the imine nitrogen and carbonyl carbon of the CPV B - state as it is depicted in the passage is sp2 and sp2.

Generally, the hybridization depends upon the amount and type of bonds of the atom analyzed has in the molecule.

Let's consider some examples:

A Carbon atom bonded to 4 Hydrogen atoms has a sp3 hybridization.

A Carbon atom bonded to 2 Hydrogen atoms and to 1 Carbon with a double bond (like in ethene) has a sp2 hybridization

A Carbon bonded to 1 Hydrogen and 1 Carbon with a triple bond (like in ethyne) has a sp hybridization.

We will be able to determine the hybridization by analyzing the type and amount of unions of the nitrogen and the carbonyl.

Basically, in the imine, the Nitrogen atom has a double bond to a Carbon atom and a single bond with two other Carbon atom, with addition to the lone pair of electrons (counts as a bond) so it will have a sp2 hybridization.

And in the carbonyl, the Carbon has two simple bonds to other Carbon and a double bond to an oxygen atom. Therefore, it will also have a sp2 hybridization.

Learn more about hybridization from the link given below.

https://brainly.com/question/14140731

#SPJ4

Answer:

1. 91.56 g of Br2.

2. 101.86 g of AlBr3

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2Al + 3Br2 —> 2AlBr3

Next, we shall determine the masses of Al and Br2 that reacted and the mass of AlBr3 that is produced from the balanced equation. This is illustrated below:

Molar mass of Al = 27 g/mol

Mass of Al from the balanced equation = 2 × 27 = 54 g

Molar mass of Br2 = 2 × 80 = 160 g/mol

Mass of Br2 from the balanced equation = 3 × 160 = 480 g

Molar mass of AlBr3 = 27 + (3 × 80)

= 27 + 240

= 267 g/mol

Mass of AlBr3 from the balanced equation = 2 × 267 = 534 g.

From the balanced equation above,

54 g of Al reacted with 480 g of Br2 to produce 534 g of AlBr3.

1. Determination of the mass of bromine, Br2 that reacted.

This can be obtained as follow:

From the balanced equation above,

54 g of Al reacted with 480 g of Br2.

Therefore, 10.3 g of Al will react with = (10.3 × 480)/54 = 91.56 g of Br2.

Therefore, 91.56 g of Br2 took part in the reaction.

2. Determination of the mass of the compound, AlBr3 produced from the reaction.

The can be obtained as follow:

Since no amount of Al is remaining, Al is the limiting reactant. Thus, we can obtain the mass of AlBr3 produced from the reaction as follow:

From the balanced equation above,

54 g of Al reacted to produce 534 g of AlBr3.

Therefore, 10.3 g of Al will react to produce = (10.3 × 534)/54 = 101.86 g of AlBr3.

Thus, 101.86 g of AlBr3 were produced from the reaction.

91.56grams of bromine reacted and 101.86 grams of Aluminium bromide reacted.

Balanced chemical equation for the reaction between aluminum and liquid bromide is given below:

2Al + 3Br2 —> 2AlBr3

Determining masses of Al and Br2

Molar mass of Al = 27 g/mol

Mass of Al from the balanced equation = 2 × 27 = 54 g

Molar mass of Br2 = 2 × 80 = 160 g/mol

Mass of Br2 from the balanced equation = 3 × 160 = 480 g

Molar mass of AlBr3 = 27 + (3 × 80) = 27 + 240= 267 g/mol

Mass of AlBr3 from the balanced equation = 2 × 267 = 534 g.

From the balanced equation above,

54 g of Al reacted with 480 g of Br2 to produce 534 g of AlBr3.

Mass of bromine, Br2 that reacted.

54 g of Al reacted with 480 g of Br2, 10.3 g of Al will react with = (10.3 × 480)/54 = 91.56 g of Br2.

Therefore, 91.56 g of Br2 participated in the reaction.

Mass of the compound, AlBr3 produced from the reaction. Since no amount of Al is remaining, Al is the limiting reactant. Thus, we can obtain the mass of AlBr3 produced from the reaction as follow:

54 g of Al reacted to produce 534 g of AlBr3.

Therefore, 10.3 g of Al will react to produce = (10.3 × 534)/54 = 101.86 g of AlBr3.

Thus, 101.86 g of AlBr3 is produced in the reaction.

Learn more about aluminum:

brainly.com/question/25869623?referrer=searchResults

Tinctures are the antimicrobial solutions with alcohol or water -alcohol mixtures as the solvent.

A tincture reveals the presence of something. It is extracted from plants in an alcohol solution. Specific proportions of water, alcohol, and dissolved plant material make up tinctures. The ratios vary depending on the plant we're using and what we want to extract. The alcohol functions in two ways: first, as a preservative, and second, as a solvent that draws "constituents"—compounds—from the plant.

The alcohol being utilized is food-grade alcohol. Its scientific name is ethanol, sometimes known as ethyl alcohol, and it is the same substance found in beer, wine, and all other alcoholic beverages in your liquor cabinet. Herbal tinctures use alcohol because it is an excellent solvent for herbs. Alcohol is also used as preservatives. Example; Tincture of iodine in solution of iodine in alcohol

To know more about Tinctures click here

brainly.com/question/28402014

#SPJ4

Answer:

A = water has high surface tension

the answer is a hope this helps and plz give me brainlist :)

The dissolution equation of the slightly soluble compound al(oh)3 if the solubility product expression is Ksp = [Al3+][OH–]3 will be:

Al(OH₃)\(_{(s)}\) ⇄ Al³⁺\(_{(aq)}\) + 3OH⁻\(_{(aq)}\)

A compound is created when two or more elements combine chemically in a specific mass ratio. Compounds are substances made up of two or more different types of elements in a specific proportion of their atoms. When the elements combine, some of their individual properties are lost and the newly formed compound has new properties.

Chemical formulas serve as a representation of compounds. A chemical formula is a symbolic representation of the atom compositions that make up a specific chemical compound. The chemical formula of water is H2O, which indicates that two hydrogen atoms and one oxygen atom have combined to form one molecule of H2O.

Learn more about Compounds

https://brainly.com/question/26487468

#SPJ4

As a result, 1.5 moles of glycerol absorb about 1.99 Joules of heat when their temperature rises from 25 to 70 degrees Celsius.

Glycerin is a straightforward polymer. The molecular formula of this solvent is C3H8O3. It is sometimes referred to as glycerine or glycerol.

We can use the following formula to determine how much heat 1.5 moles of glycerol absorbed: q = n × C × ΔT

Glycerol has a specific heat capacity of 2.43 J/g°C. This needs to be divided by the molar mass of glycerol in order to be converted to Joules per mole per degree Celsius:

C = (2.43 J/g°C) / (92.09 g/mol)

C = 0.0264 J/mol°C

The change in temperature can then be calculated as follows:

ΔT = (70°C - 25°C) = 45°C

We can now enter the values into the formula as follows:

q = (1.5 mol) × (0.0264 J/mol°C) × (45°C)

q = 1.99 J

To know more about glycerol visit:-

https://brainly.com/question/10636538

#SPJ1

Answer: true

Explanation: hope this helpes

Answer:

TRUE

Explanation:

power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.

Answer:

Half life is 46 days

Explanation:

The half life of a radioactive substance can be predicted by:

Nt = No(1/2)^(t/th)

Nt is the amount remaining (mg)

No is the initial amount (mg)

t is the time elapsed, in days

th is the half life in days.

Nt = No(1/2)^(t/th)

0.50mg = (8.0mg)(1/2)^(184 days/th)

Using logs, we can solve this for th

th = 46 days

Answer: 3 moles

Explanation: Divide 54 by 18 to get 3.

The chemist has 642.4 millimoles of barium acetate in the solution.

To calculate the millimoles of barium acetate (Ba(C₂H₃O₂)₂) in the solution, we can use the formula:

moles = molarity × volume (in liters)

First, let's convert the volume from milliliters (mL) to liters (L):

440.0 mL ÷ 1000 = 0.440 L

Now we can substitute the given values into the formula:

moles = 1.46 M × 0.440 L

moles = 0.6424 mol (rounded to 4 decimal places)

To convert the moles to millimoles, we multiply by 1000:

millimoles = 0.6424 mol × 1000

millimoles = 642.4 mmol (rounded to 3 significant digits)

Therefore, the chemist has 642.4 millimoles of barium acetate in the solution.

It's important to note that the molarity (M) represents the number of moles of solute per liter of solution. By multiplying the molarity by the volume in liters, we can find the number of moles of solute. To convert moles to millimoles, we multiply by 1000. The result represents the millimoles of barium acetate present in the given volume of solution.

For more such questions on barium acetate visit:

https://brainly.com/question/15304103

#SPJ8

Answer:

The reaction that occurs is a redox reaction. The Copper metal (Cu 0)on the copper pennies is oxidized in concentrated nitric acid to produce Cu2+ ions. Copper is easily oxidized to Cu2+, which is blue in aqueous solutions (water) so you should see the solution turn blue as the copper penny reacts.

Have a nice day ;)(^-^)

Taking into account the definition of chemical and physical change, the reaction of the copper penny with nitric acid is a chemical change.

Physical changes are those in which the substances involved are the same before and after the change. That is, a physical change is a transformation in which the nature of matter does not change.

Chemical changes are considered to be those in which the substances involved are transformed into totally different ones.

In this way, the initial substances do not exist after the phenomenon has occurred and instead, new substances are formed, different from the initial ones.

That is, a chemical change is a transformation in which the nature of matter varies.

When a penny of copper reacts with nitric acid, a redox reaction occurs where the copper metal in the copper pennies is oxidized to produce Cu²⁺ ions, whereas because the nitric acid oxidizes the copper, the nitric acid itself is reduced to nitric oxide (NO). Nitric oxide then reacts with oxygen in the air to produce nitrogen dioxide (NO₂). This can be represented by:

Cu + 4 HNO₃ → Cu²⁺(ac) + 2 NO₃⁻  + 2 NO₂ + 2 H₂O

Finally,  the reaction of the copper penny with nitric acid is a chemical change because a redox reaction occurs.

Learn more:

Answer: 70.0°C

Explanation:

Quantity of heat = Mass * Specific heat * Change in temperature

Quantity of heat = 104.6 KJ

Mass = 500.0 g

Specific heat of water is 4.18 J/g°C

Change in temperature assuming final temperature is x = x - 20

Units should be in grams and joules:

104,600 = 500 * 4.18 * (x - 20)

104,600 = 2,090 * (x - 20)

x - 20 = 104,600/2,090

x = 104,600/2,090 + 20

x = 69.8

= 70.0°C

The mass of 0.5 mole of the element is approximately 6.025 grams.

To calculate the mass of 0.5 mole of the element, we need to know the molar mass of the element.

Given that the mass of 2 x 10^21 atoms of the element is 0.4 grams, we can use this information to find the molar mass.

The number of atoms in 1 mole of any substance is given by Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.

First, we calculate the molar mass of the element using the given information:

Molar mass = Mass of 2 x 10^21 atoms / Number of moles of 2 x 10^21 atoms

Molar mass = 0.4 g / (2 x 10^21 atoms / (6.022 x 10^23 atoms/mol))

Molar mass ≈ 0.4 g / (3.32 x 10^-2 mol)

Molar mass ≈ 12.05 g/mol

Now that we know the molar mass of the element is approximately 12.05 g/mol, we can calculate the mass of 0.5 mole of the element:

Mass = Molar mass x Number of moles

Mass = 12.05 g/mol x 0.5 mol

Mass = 6.025 grams

for more such questions on element

https://brainly.com/question/28376204

#SPJ8

Answer:

True

Explanation:

True definition of a mixture itself

Answer:

files  

Explanation:

i had to answer the same question

Heat transfers from object A to object B, because molecules from A collide with those from B. Option 1.

Heat always flows from an object at a higher temperature to an object at a lower temperature. When two objects at different temperatures are in contact with each other, their molecules collide, and this collision transfers energy from the hotter object to the colder object.

As a result, the hotter object loses heat, and the colder object gains heat. This process will continue until the two objects reach thermal equilibrium, meaning that they have the same temperature and there is no more net heat transfer between them.

Therefore, in the given scenario, object A, which is hotter, will transfer heat to object B, which is colder, as the molecules from object A collide with those from object B.

More on heat transfer can be found here: https://brainly.com/question/13433948

#SPJ1

Answer:

Heat transfers from object A to object B, because molecules from A collide with those from B.

Explanation:

Answer:

Sodium fluoride is a colorless crystalline solid or white powder, or the solid dissolved in a liquid. It is soluble in water. It is noncombustible.(I got this answer from g o o g l e)

Explanation:

Answer:

The laboratory equipment is called beaker

An alloy of a transition metal is manganese (III) oxide. The chemical formula of this molecule is Mn2O3, and the oxidation state of the manganese in it is +3.  

Because manganese is a transition metal, as it chemically reacts with oxygen, the electrons will be taken up as it loses valence electrons to achieve stability. It will consequently result in the creation of an ionic compound. Mn in this molecule has an oxidation state of +3 and oxygen has an oxidation state of -2. As a result, manganese (III) oxide can be classified as a transition metal complex. The chemical formula of the compound is, and the oxidation state of the manganese in it is +3.

Learn more about oxidation state here:

https://brainly.com/question/13284464

#SPJ4

Complete question:

Manganese (III) oxide is a transition metal compound. The oxidation state of manganese in this compound is _______ , and the chemical formula of the compound is __ __ __ __.

The methyl red (MR) test detects the presence of lactic acid in a sample. The correct answer is Lactic acid.

It is used to differentiate between bacteria that produce mixed acids (which lower the pH and turn the indicator red) and those that produce primarily lactic acid (which do not lower the pH significantly and do not turn the indicator red). The other options listed (low pH, 2,3 butanediol, acetoin, 100 metals) are not detected by the MR test.The methyl red (MR) test is used to detect lactic acid in a bacterial culture. This test helps determine if a microorganism is producing acidic byproducts through mixed acid fermentation.

More on methyl red (MR) test: https://brainly.com/question/31980982

#SPJ11