Samples of the air we breathe that were taken from different parts of the world have all been found to contain about 78% nitrogen, 2196
oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases. Based on this analysis, which is the correct classification for air?

Answer:

Explanation:

this is the answer hope it helps!(:

The chemical formula of pentanitrogen heptachloride is N₅Cl₇ as it has 5 nitrogen atoms and 7 chlorine atoms.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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The Cistercian order split from the Cluniac order to follow the rules of Saint Benedict more strictly.

The Cistercians, formally known as the Order of Cistercians (Latin: (Sacer) Ordo Cisterciensis, abbreviated as OCist or SOCist), are a Catholic religious order of monks and nuns who split off from the Benedictines and adhere to the Latin Rule, which incorporates Bernard of Clairvaux's contributions as well as the Rule of Saint Benedict. As a nod to the color of the "cuculla" or cowl (choir robe) worn by the Cistercians over their habits as opposed to the black cowl used by Benedictines, they are also known as Bernardines, after Saint Bernard himself, or as White Monks.

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Answer:

Wavelength (D)............

Answer:

A

Explanation:

the amplitude is measured from the dotted line to the top of the crest. Looking at the picture the amplitude gets smaller

Answer:

Progress made in Asia and the Middle East is clear, with nations such as China, Singapore and Malaysia all demonstrating increased adaptability. Much of Africa has also made progress since 1995, along with South American nations, including Brazil and Chile.

The chemist is likely planning a solid-phase oligosaccharide synthesis experiment.

Solid-phase oligosaccharide synthesis involves the stepwise assembly of carbohydrate chains on a solid support using blocking groups and activating groups. The blocking groups protect specific functional groups to ensure selective reactions, while the activating groups enhance the reactivity of certain functional groups during the synthesis process. This method allows for the controlled and sequential addition of monosaccharide units to build up complex oligosaccharide structures. The resulting oligosaccharides can then be analyzed using various techniques such as nuclear magnetic resonance (NMR) analysis, liquid chromatography mass spectrometry/mass spectrometry (LC-MS/MS) analysis, or other analytical methods to characterize their structure and properties.

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Answer:

The protons determine the name of an element and also atomic number because its the same as protons.

Answer:One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms

Explanation:

Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).

To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when  present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.

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Answer:

30

Explanation:

I’m pretty sure it is

Answer:    

I am sure it is the reaction will shift right towards the

product

Nitrogen has a normal boiling point of 77.4 K and a melting point (at 1 atm) of 63.2 K. Its critical temperature is 126.2 K, and its critical pressure is 2.55 * 104 torr. It has a triple point at 63.1 K and 94.0 torr.

The temperature and pressure at which the solid, liquid, and vapour phases of a pure substance can coexist in equilibrium.

- Normal melting point: 63.2 K.

- Normal boiling point: 77.4 K.

- Triple point: 0.127 atm and 63.1 K.

- Critical point: 33.5 atm and 126.0 K.

In such a way:

- N2 does not exist as a liquid at pressures below 0.127 atm: that is because below this point, solid N2 exists only (triple point).

- N2 is a solid at 16.7 atm and 56.5 K: that is because it is above the triple point, below the critical point and below the normal melting point.

- N2 is a liquid at 1.00 atm and 73.9 K: that is because it is above the triple point, below the critical point and below the normal boiling point.

- N2 is a gas at 0.127 atm and 84.0 K: that is because it is above the triple point temperature at the triple point pressure.

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Answer:

The element that is likely to be the best conductor of electricity is c. Antimony (Sb).

1) l=n-1

l=1

ml=-1,0,1(3values)

2a) n=2 l=1 ml=-1,0,1

number of orbitals in sublevels = 3

b) n=3 l=2 ml = -2,-1,0,1,2 number of orbitals in sublevels = 5

c)n=5 l=4 ml= -4,-3,-2,-1,0,1,2,3,4 number of orbitals in sublevels =9

An electron in a certain atom is in the n = 2 quantum level.  The possible values of l and ml that it can have are l=1 and ml=-1,0,1.

The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.

Some substances are either bigger or smaller than atoms. Examples of chemical species which are not commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles.

Atoms make up molecules and compounds, however they are not actual atoms. The molecules and compounds salt, water, and methanol are examples of. Ions are the name for electrically charged atoms.

l=n-1

l=1

ml=-1,0,1(3values)

Therefore, the possible values of l and ml that it can have are l=1 and ml=-1,0,1.

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The atomic number or the number of protons in an atom are two properties that can be used to identify an element. The number of neutrons and electrons is frequently equal to the number of protons, but this can vary depending on the atom.

The atomic number of an element is the number of protons, whereas the mass number is the number of protons plus the number of neutrons.

Because different elements have different numbers of protons and electrons, their atomic structures differ. This explains why different elements have distinct properties.

The chemical elements are ordered from left to right and top to bottom by increasing atomic number, or the number of protons in an atom's nucleus, which generally corresponds to increasing atomic mass.

The atomic symbol, atomic number, and mass number of an element are important characteristics in the periodic table. Dmitri Mendeleev, a Russian chemist, is credited with designing the modern periodic table. Only 63 elements were known when he designed his periodic table.

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As per the given data, approximately 94.17 grams of water will form when 10.54 g of \(H_2\) reacts with 95.10 g of \(O_2\), and \(H_2\) is the limiting reactant.

To determine the limiting reactant, we need to compare the amounts of each reactant and their respective stoichiometric coefficients in the balanced equation.

Given:

Mass of \(H_2\) = 10.54 g

Mass of \(O_2\) = 95.10 g

First, we need to convert the masses of \(H_2\) and \(O_2\) to moles using their molar masses:

Molar mass of \(H_2\) = 2.016 g/mol

Molar mass of \(O_2\) = 31.9988 g/mol

Number of moles of \(H_2\) = 10.54 g / 2.016 g/mol ≈ 5.229 mol

Number of moles of \(O_2\) = 95.10 g / 31.9988 g/mol ≈ 2.972 mol

Now, let's compare the moles of \(H_2\) and \(O_2\) to their stoichiometric coefficients in the balanced equation:

\(2H_2 + O_2 --- > 2H_2O\)

From the balanced equation, we can see that the stoichiometric ratio is 2:1 for \(H_2\) to \(O_2\). This means that 2 moles of \(H_2\) react with 1 mole of \(O_2\) to produce 2 moles of \(H_2O\).

Based on the stoichiometric ratio, we can calculate the maximum amount of water that can be formed from the given amounts of H2 and O2.

The moles of water formed will be limited by the reactant that produces fewer moles of water. From the stoichiometry, we know that 2 moles of H2 react to produce 2 moles of H2O.

Number of moles of water that can be formed from H2 = 2.229 mol × (2 mol H2O / 2 mol H2) = 5.229 mol

Number of moles of water that can be formed from O2 = 2.972 mol × (2 mol H2O / 1 mol O2) = 5.944 mol

Since the number of moles of water that can be formed from H2 (5.229 mol) is less than the number of moles that can be formed from O2 (5.944 mol), H2 is the limiting reactant.

To find the mass of water formed, we need to multiply the number of moles of water by its molar mass:

Molar mass of H2O = 18.015 g/mol

Mass of water formed from H2 = 5.229 mol × 18.015 g/mol ≈ 94.17 g

Therefore, approximately 94.17 grams of water will form when 10.54 g of H2 reacts with 95.10 g of O2, and H2 is the limiting reactant.

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True. The fact that atom X undergoes radioactive decay means that it is an unstable atom that will eventually decay into a more stable form, which in this case is atom Y.

The half-life of atom Y is five minutes, which means that it takes five minutes for half of the original amount of atom Y to decay into another substance.

After ten minutes, which is two half-lives of atom Y, all the original number of atom X would have completely turned into atom Y because the first half-life would have transformed half of the atom X into atom Y, and the second half-life would have transformed the remaining half into atom Y. Therefore, the statement is true.

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Answer:

liquids

the particles are free to move

Answer:

D - combining it's potential energy with it's kinetic energy

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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The free energy change of a reaction (ΔG°) can often be approximated by the change in bonding energy, particularly for reactions not carried out at high temperatures, because bonding energy is a major factor that determines the stability of molecules.

The free energy change of a reaction (ΔG°) is the energy available to do work in a system. It can often be approximated by the change in bonding energy only, particularly for reactions not carried out at high temperature because at low temperatures, the changes in entropy (disorder) and vibrational energy are usually small. This means that the change in bonding energy dominates the free energy change. However, at high temperatures, the changes in entropy and vibrational energy become more significant and must also be considered when calculating the free energy change. Therefore, the approximation of the change in bonding energy only is only valid for reactions not carried out at high temperature.

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Answer:

80.5 atm

Explanation:

First of all, we convert 28.0 °C and 50.0 °C into K:

To answer this problem we'll use Gay-Lussac's Law, which states that:

In this case:

We put the data:

And solve for P₂:

Thus, the correct answer is 80.5 atm.

Answer:

Mechanical energy

Explanation:

Given that,

Potential energy of an object is given by :

P = mgh

The kinetic energy of an object is given by :

\(K=\dfrac{1}{2}mv^2\)

Where

m is mass

h is height

v is velocity of the object

The sum of potential and kinetic energy is equal to total energy or the mechanical energy.

Hence, if air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body is equal to mechanical energy.

The calorimeter constant when 51.203g of water at 55.2c is added to a calorimeter containing 49.783g of water at 23.5c and for the system to equilibrate, the final temperature reached is 37.6c is  9.67J/gc.

Given mass of water (m1) = 51.203g

Temperature of water (T1) = 55.2c

mass of water (m2) = 49.783g

Temperature of water (T2) = 37.6c

the final temperature reached is = 37.6c

We know that specific heat (Q) = mCpΔT where m is mass Cp is latent heat and ΔT is change in temperature.

So Qwater = 51.203 x 4.184 x (23.5 - 55.2) = 6791.9J

Qcalo = 49.783 x Cp x (23.5 - 37.6) = 701.9 x Cp

Given that Qwater = Qcalo

6791.9J = 701.9 x Cp

Cp = 9.67J/gc

Hence the calorimeter constant is  9.67J/gc

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Balancing the equation :

KOH(aq) + HBr(aq) --> KBr(aq) + H2O(l)

This is the balanced chemical reaction because it follows the following ionic reaction:

H ^(aq)+ + Br^(aq)- + K^+(aq) + OH ^- (aq) → K^+(aq) + Br^-(aq) + H2O (l)

The solute which  provide the sharper end point in a titration with 0.10 M is the question content area , 0.10 M sodium phenolate. Hence option b is correct.

Titration is defined as the assessing how much of one ingredient is needed to react with another to determine how much of that substance is present in a liquid. The titration is used to determine the equivalence point, or the point at which chemically equivalent amounts of the reactants have been mixed.

The base will be firmer and the terminal point will be sharper the lower the value is. Therefore, it is possible to predict which solute will produce a sharper end point by comparing the values of the two solutes that are presented.

Thus, the solute which  provide the sharper end point in a titration with 0.10 M is the question content area , 0.10 M sodium phenolate. Hence option b is correct.

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Answer:

specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.

Answer:

Applied science is a discipline that is used to apply existing scientific knowledge to develop more practical applications, for example: technology or inventions. In natural science, basic science (or pure science) is used to develop information to explain phenomena in the natural world.

Answer:

• Because engineers apply science and its theories into practical situation

Take an example of;

→ A generator: When creating a generator, electromagnetic induction theorem is applied. [ self and mutual inductance ]

→ A plane: The wings are made in considerance of Bernoulli principle and viscous drag

\(.\)

Answer:

independent variable is how it changes how it affects something else dependent variable is something being measured

Answer: An independent variable is the variable which is changed by the scientist also called the manipulated variable. The dependent variable is the result of the action of the independent variable. it is the factor that changes due to the independent variable. It is also known as the responding variable.

Explanation