What volume of air is present in human lungs if 0.19 mol are present at 312K and 1.3 atm?
A 0.066L
B 2.9L
C 5.5L
D 3.7L

Answer:1

Explanation:

The solution is diluted, and its specific heat and its density to be the same as for pure water:
(a) The change in temperature recorded in this experiment is AT = -1.5°C.

(b) The heat transferred between the system and the surroundings can be calculated using the formula Q = mcAT, where m is the mass of the solution, c is its specific heat capacity, and AT is the change in temperature.

Assuming that the solution has a mass of 100 g and a specific heat capacity of 4.18 J/g-°C, then the heat transferred is 100 x 4.18 x (-1.5) = -627 J.

(c) The molar heat of the neutralization reaction can be calculated using the formula q = -Q/n, where q is the molar heat, Q is the heat transferred, and n is the number of moles of the reaction.

Since 1 mole of HCl and 1 mole of NaOH are used in the reaction, n = 1. Thus, the molar heat of the neutralization reaction is -627/1 = -627 kJ/mol.

(d) The neutralization reaction is exothermic, as it releases energy in the form of heat.

This is due to the fact that the reaction between NaOH and HCl is highly energetically favorable, with the products having a lower energy than the reactants.

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Answer:

To draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons.

What is N for silicon tetrachloride, SiCl4?

Explanation:

A covalent compound is formed by the mutual sharing of electrons between two atoms.

According to Lewis octet theory, every atom wants to attain eight electrons around it.

For the given molecule SiCl4

Silicon has four valence electrons.

To attain the nearest inert gas configuration it requires four more electrons.

Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.

The Chlorine atom has seven valence electrons.

To get eight electrons in its valence shell it needs one more electron.

That is shared by the silicon atom.

Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.

N value for Si is --- 4.

A the available electrons for Si is ---- 4.

The available electrons for Si 4 and the needed electrons are also 4. A covalent compound is formed by the equal sharing of electrons between two atoms.  

A covalent compound is formed by the equal sharing of electrons between two atoms.  

According to Lewis octet theory, every atom wants to attain eight electrons in the shell.  

For the given molecule \(\bold {SiCl_4}\)  

Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.  

Therefore,  the available electrons for Si 4 and the needed electrons are also 4.

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The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.

For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.

A voltaic cell, also known as a galvanic cell or an electrochemical cell, is an electrochemical device that generates electrical energy through a spontaneous chemical reaction. It consists of two half-cells connected by an external circuit and a salt bridge or porous barrier that allows the flow of ions between the two half-cells.

Each half-cell consists of an electrode immersed in an electrolyte solution. The electrode is typically made of a metal or a conductive material, and the electrolyte is a solution containing ions that can participate in the redox (reduction-oxidation) reaction.

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Answer:

allows the atoms of different elements to bond together to form new substances

The negatively charged electrons are held together by electrostatic force by the positively charged atomic nucleus.

Electrostatic forces are non-contact forces that pull or push on objects without contacting them.

The positively charged atomic nucleus holds the negatively charged electrons together with electrostatic force.

Thus, in this way electrostatic forces affect the electrons in an atom.

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When liquid is moved from one container to another, its shape, level, temperature, and composition may change depending on the properties of liquid and containers involved.

When liquid is moved from one container to another, its shape and volume may change depending on the properties of liquid and the containers involved.

If liquid is poured from one container to another, it may change its shape to fit the new container's shape. For example, if liquid is poured from a wide container to a narrow one, it will take the shape of the new container and become taller and narrower.

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Considering the definition of STP conditions, the mass of nitrogen trioxide (NO₂) that occupies 156 L at STP is 320.16 grams.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

In this case, you can apply the following rule of three: if by definition of STP conditions 22.4 liters are occupied by 1 mole of nitrogen trioxide, 156 L are occupied by how many moles of nitrogen trioxide?

\(amount of moles=\frac{156 L x 1 mole}{22.4 L}\)

amount of moles= 6.96 moles

The molar mass of nitrogen trioxide is 46 g/mole. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 46grams, 6.96 moles of the compound contains how much mass?

\(mass=\frac{6.96 moles x 46 grams}{1 mole}\)

mass= 320.16 grams

Finally, the mass of nitrogen trioxide (NO₂) that occupies 156 L at STP is 320.16 grams.

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Answer:

Basis and basic​ are two different words.

In English, Basis is used as a noun while basic is used as an adjective. Basis term refers as the base or starting point of any discussion.

For example: Bread is a basic ingredient of cake.

                      On the basis of Mendel's hypothesis.

In chemistry, Basis set is used as a set of functions that represent the electronic wave function in the density-functional theory which forms an  algebraic equations that can be easily implemented on a computer.

While Basic term is used for substances that can accept a hydrogen ion (H+) from another substance and have pH above 7. such as sodium.

So, It is not important that both the terms, basis and basic change their English meaning if used in chemistry, they both can be used with English meaning in chemistry as well. Bases and basic,​ both the terms can be used as either English or Chemistry without affecting the meaning.

The Correct is Na2CO3 contains both ionic and covalent bonds. The correct answer is (E).

SF6 (or sulfur hexafluoride) is a covalent compound in light of the fact that both sulfur and fluorine are nonmetal components.

There are sure mixtures that contain both ionic and covalent bonds. An ionic bond is a synthetic connection between two molecules, where one particle gives its electron to another iota. Then again, the covalent bond has a superior electron design because of the contribution of two particles sharing electrons.

The mixtures containing both ionic and covalent bonds for the most part contain metal, nonmetal, and hydrogen.

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The chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.

The chemical formula CH₂O represents formaldehyde, which is a simple organic compound.

To determine the number of elements in this formula, we count the different types of atoms that are present. In this case, there are three different types of atoms: carbon (C), hydrogen (H), and oxygen (O).

Therefore, the chemical formula CH₂O contains 3 elements: carbon, hydrogen, and oxygen.

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The energy difference between the orbitals can be calculated from bohr's model.

According to the bohr's model, the electrons are in continuous motion round the nucleus closed orbits of definite energy level. as the distance of the cell increases from the nucleus ,energy level of cell increases..as long as electron occupy a definite energy level, it doesn't radiate out energy. The emission of energy occurs only when electron jumps from one level to other.

            E=  h c/ λ

 Sodium atom emit light with a wavelength of 330nm when an electron moves from a 4p orbital to a 3s orbital.

             λ=330nm

             h=6.625 .10-34 (Planck's constant)

             c= 3.0 .108m/s-1

putting the values in the expression of Energy we get the energy    difference.

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Answer:

Explanation:

Vinegar contains acetic acid, and baking soda is sodium hydrogen carbonate. When they are combined, a reaction occurs and bubbles form. Which gas is in the bubbles, and why do the bubbles form? Oxygen gas forms because an acid reacts with a metal.

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molarity of glucose  = 0.0482 / 165 X100 % = 0.029 % and that of ribose = 0.0318 / 165 = 0.018%

and the molarity of the total solution is 8%

The molar concentration can be calculated by the formula

( moles of solute/ volume of solvent multiplied by 100 ) %

moles of glucose = given mass/ molar mass

and given mass = 8.68

molar mass of glucose = 180 g

and molar mass of ribose = 150 gram

Thus mole of glucose = 8.68/ 180 = 0.0482

And molarity of glucose  = 0.0482 / 165 X100 % = 0.029 %

Thus molarity of ribose = 0.0318 / 165 = 0.018%

And molarity of the total solution = 0.08 X 100 = 8 %

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Answer:

28 kg

Explanation:

Answer:

Cold water

Explanation:

A simple way to solve this kind of problems is to keep in mind that:

Solids have stronger intermolecular attractive forces than liquids, and liquids have stronger forces than gases.

Cold water behaves more similarly to solids than hot water. Conversely, hot water behaves more similarly to gases than cold water. Thus, cold water has stronger intermolecular attractive forces than hot water.

The gravitational potential energy in a 100-kg diver, at 10-m, is 9800 J.

The gravitational potential energy of an object is calculated by using the formula:
Pe = mgh

Where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above the ground.

Given that the mass of the diver is 100 kg and the height of the platform is 10 m, we can plug these values into the formula to find the potential energy:
PE = (100 kg)(9.8 m/s²)(10 m)
PE = 9800 J

Therefore, the gravitational potential energy of the 100-kg diver on the 10-m platform is 9800 J.

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Answer:

Element

Explanation:

It's C4 so there are four carbons.

Hope this helped! :))

Answer:

The correct answer is - Both are ratios of the amount of solute over the amount of solution.

Explanation:

Molarity is the number of moles of a substance in 1 liter of the solution. Another unit of the concentration, weight percentage, refers to the ratio of the mass of the solute (a dissolved substance) to the mass of the solution.

Molarity is to divide moles by liters, but the convention in mass percent is to divide grams by milliliters. If you prefer to think only in terms of liters (not milliliters), then simply consider mass percent as kilograms divided by liters.

Answer:

A. Both are ratios of the amount of solute over the amount of solution.

Hope this helps! :D

Explanation:

Answer:

If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases. The decreasing speed is called negative.

Answer:The model states that electrons in atoms move in circular orbits around a central nucleus and can only orbit stably in certain fixed circular orbits at a discrete set of distances from the nucleus. These orbits are associated with definite energies and are also called energy shells or energy levels.

bohrs model and other models are really hard to understand but i hope this will help you!

Answer: they both eat fish

Explanation:

Answer:

false

Explanation:

it gets nourishment from the storage tissues in the seeds, when it develops into a young plant with roots, then it takes nutrients from the soil

Answer:

no, because our nation is just too big. it would be difficult to keep track of votes and find a common ground amongst all the people

Answer:

Large Cargo Ship

Explanation:

Hope it helped!