a gaseous mixture of o2 and n2 contains 40.8 % nitrogen by mass. what is the partial pressure of oxygen in the mixture if the total pressure is 345 mmhg ?

Answer:

electronegativities

Explanation:

The polarity of a covalent bond can be judged by determining the difference in the electronegativities of the two atoms making the bond. The greater the difference in electronegativities, the greater the imbalance of electron sharing in the bond.

Answer:

2mg+2hcl------>mgcl2+h2

Answer: When magnesium reacts with hydrochloric acid, it produces magnesium chloride and hydrogen gas. To write the formula for this reaction, we first need to identify the elements involved and their respective chemical symbols. The chemical symbol for magnesium is Mg, the symbol for hydrochloric acid is HCl, and the symbol for hydrogen is H.

Next, we need to balance the equation by making sure that the number of atoms of each element is the same on both sides of the arrow. In this case, we have one atom of magnesium on the left side of the arrow and one atom of hydrogen on the right side. However, we also have one atom of chlorine on the left side and two atoms of hydrogen on the right side. To balance the equation, we need to add a coefficient of 2 in front of the HCl on the left side, so that the equation becomes:

Mg + 2 HCl -> MgCl2 + H2

This balanced equation shows that for every one atom of magnesium that reacts with two atoms of hydrochloric acid, two atoms of magnesium chloride and two atoms of hydrogen gas are produced.

Low pE suggests that materials dissolved in the water are easily accessible sources of electrons.

Calcium (Ca), magnesium (Mg), sodium (Na), and potassium (K) are the most prevalent cations in water, whereas bicarbonate (HCO3), chloride (Cl), and sulphate are the most prevalent anions (SO4).

Higher alkalinity levels in surface waters will buffer acid rain and other acid pollutants and avoid pH shifts that are hazardous to aquatic life. Alkalinity is a measure of how much acid can be added to a liquid without creating a significant change in pH.

Rapid temperature changes in an untreated natural body of water are known as thermal pollution. The most frequent source of this pollution is hot discharge from an industrial site.

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A substance with a molar mass of around 60 g/mol with a composition of 3.3% H, 19.3% C, and 77.4% O has the chemical formula CH2O3.

The number of atoms of each element in one molecule of a substance is specified by the molecular formula. It displays the precise count of every atom in a molecule. For instance, propane has the chemical formula C4H10.

An statement that lists the quantity and kind of atoms in a substance's molecules is known as a molecular formula. Examples: Hexane molecules have a chemical formula of C6H14 and include 6 C and 14 H atoms.

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Single displacement in acid properties is a kind of oxidation-reduction chemical reaction.

A chemical reaction is a process that leads to the transformation of one set of chemicals into another chemical. It is also known as a single replacement reaction.

It is a reaction in which one element is substituted with another element. When a replacement reaction occurs, a pure element and an aqueous compound are formed. It is denoted as:

      A + BC ⇒ AC + B   were, A and B are pure elements.

Acids react with metals to form salt and hydrogen gas. The metals that are more active than acids can undergo a single displacement reaction. Due to this, the acid will be replaced by the metal, but it does not apply to less reactive metals.

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a. The names for the chemical compounds in the task given above are as follows:

b. The formula for the compound given above are:

It is a substance formed between two two or more different elements which are chemical compound together and whose properties are entirely different from the properties of the contribution elements.

In conclusion, we can now confirm from the explanation given above that a compound could be ionic or molecular.

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Here are some potential questions and hypotheses for a stem fair project on cell phone radiation:

Question: Does the distance between a cell phone and a person's head affect the level of radiation exposure?

Hypothesis: If a cell phone is held closer to a person's head, then the level of radiation exposure will be higher.

Question: Do different types of cell phone cases affect the level of radiation exposure?

Hypothesis: If a cell phone is covered by a case made of a certain material, then the level of radiation exposure will be lower.

Question: How does the amount of time a person spends on their cell phone affect their level of radiation exposure?

Hypothesis: If a person spends more time on their cell phone, then their level of radiation exposure will be higher.

It's important to note that these are just a few potential ideas, and you may want to come up with your own question and hypothesis based on your interests and the resources available to you. It's also important to conduct thorough research and use reliable sources to support your conclusions.

The lack of information is the major reason behind the delay in process of decision making and construction procedure.

According to the  given, there are several challenges that may occur. However, there are few points which are very difficult to follow, these are:

Listening to opposing viewpoints.

Listening to the opinions from other contrasts.

Consider any of the structural, meteorological, or environmental characteristics of this dam.

Illuminate, clarify, support, or justify my reasoning

Considering the opinion of the mayor

Considering the opinion of the dam safety officer    

The reason for the difficulty behind all of these is the lack of information given in the question.

What are the principles of construction and design ?

There is whole lot more details and information needed to display on the existing structure, its history and its composition.  If that's too much trouble for them, or they don't like it, then they can go and get themselves another dam consulting engineer.

Thus, we can conclude that the lack of information is the major reason behind the delay in process of decision making and construction procedure.

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What is wrong with the representation is that the atoms of the compound are isolated rather than combined together.

We know that a compound is composed of atoms. The atoms that make up the compound are not just isolated. The atoms can be combined in such a manner that they are intricately connected to each other and not disconnected as we see in the image.

Thus, when we can see in this image has more to do with the existence of atoms than it does the existence of the molecule that can be called glucose which was the intended representation.

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The formula for an electron's energy is E=2.1781018J(n2Z2). wavelength of light needed to move an electron from level n=1 to n=2 in an atom of hydrogen.

The energy needed to remove the electron from Li++'s first excited state is if the binding energy of the electron in a hydrogen atom is 13.6 eV. (A) 122.4eV.

It is necessary to ascertain the electrical configuration of the given nucleus and the level from which the electron has been ejected. Discover the wavelength that matches the ejected condition. the difference in energy level between the electron.

electron's energy is E=2.1781018J(n2Z2)

level n=1 to n=2

hydrogen atom is 13.6 eV. (A) 122.4eV.

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The values of entropy δs for the water, the surroundings, and the universe for the evaporation of water are positive, negative, positive.

What is entropy?

Entropy is a term used to describe the increase in disorganization inside a system or the assessment of the degree of unpredictability. It is denoted by  δs.

Gases have a higher entropy than liquids, which in turn has a higher entropy than solids. The entropy of water increases when it transforms from a liquid to a gas.

So, δs of water is positive.

The environment's entropy must decrease in order to provide the system with the thermal energy it needs.

So, δs of surroundings is negative.

The Second Law of Thermodynamics states that if a process is spontaneous i.e. water evaporation in universe.

So, δs of evaporation from open pan is positive.

The values of δs for the water, the surroundings, and the universe for the evaporation of water are positive, negative, positive.

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We would expect a sulfur-selenium bond to be polar, with the selenium end having a partial positive charge.

Hence, option 1 is the correct answer.

The size of an atom shrinks with increasing forces of attraction and shrinks with increasing forces of repulsion, according to Coulomb's Law. According to the periodic trends, selenium is the only element in the same group that is larger than a sulfur atom, while oxygen is the only one that is smaller.

The periodic table's group 6A or 16 is where sulfur is located.

Six electrons make up the valence shells of group 6A elements.

Group 6a of the periodic table include elements with valencies that are typically 2, 4, or 6. According to periodic patterns, the elements in group 6A have larger atoms as they descend the group due to the addition of an extra electron shell to the atoms of the elements.

Other elements in group 6A include tellurium, selenium, and oxygen.

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The functional group that is expected to be present in the final product between 1-hexyne and mixture of mercuric sulfate and aqueous sulfuric acid is Ketone.

In organic chemistry, ketone is a functional group with the structure R–C–R', where R and R' can be various carbon-containing substituents. Ketones contain a carbonyl group –C– and the  simplest ketone is acetone, with the formula CH₃CCH₃.

The reaction between 1-hexyne and mercuric sulphate in the presence of aqueous Sulphuric acid is a reaction that forms a product containing a carbonyl group.

The reaction occurs in alkynes but product formed depends on the structure of the alkyne. An aldehyde or ketone can be formed depending on the structure of the alkyne.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: What functional group would be expected to be found in the major, and final, organic product upon completion of the reaction between 1-hexyne and a mixture of mercuric sulfate and aqueous sulfuric acid?

Fire extinguisher is used to stop fires in a laboratory.

Chemical splashes on to your face then we should go to eye wash station for washing face.

Bunsen burner is knocked over while lit and a large fire is started then we should use fire extinguisher and should come out of lab.

Carbon dioxide in fire extinguisher is more denser than oxygen so when we spray carbon dioxide on fire, it cut off the contact with oxygen and fire goes off.

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According to ideal gas equation and assuming number of moles as 1 and volume as 6.35×10[tex]^-6[/tex] liters the pressure in the bulb is 1.837×10[tex]^-3[/tex]  atmospheres.

The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

Substituting n=1 ,V=6.35×10[tex]^-6[/tex] L,R=8.314,ΔT=1130°C=1403.15 K in the above equation P=1×8.314×1403.15/6.35×10[tex]^-6[/tex] =1.837×10[tex]^-3[/tex] atmospheres.

Thus, the pressure in the bulb when it reaches its operating temperature is 1.837×10[tex]^-3[/tex] atmospheres.

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The Answer is d. half a trillion tons

What is fossil fuels?

Fossil fuel is a term for non-renewable energy sources such as coal, crude oil, coal products, derived gas, natural gas, petroleum products and non-renewable wastes. These fuels originate from plants and animals that existed in the geological past (millions of years ago).

When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the atmosphere. Greenhouse gases trap heat in the atmosphere, causing global warming.

I suppose the question is :

How much carbon dioxide have we emitted into the atmosphere by burning fossil fuels since the industrial revolution?

a- a million tons

b- a billion tons

c- half a billion tons

d- half a trillion tons

e- a trillion tons

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A solution is prepared by dissolving 23. 7 g of cacl2 in 375 g of water. The density of the resulting solution is 1. 05 g/ml. The concentration of cacl2 is 0.5623 % by mass.

What is density?

How closely a material is packed together is determined by its density. The mass per unit volume is how it is formally defined. Symbol for density: D or Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V.

The density of a substance is a measurement of how tightly or loosely it is confined within a specific volume. We can travel through low-density materials like air, which has a density significantly lower than that of human tissue. Granite is a different material altogether. Never attempt to traverse stone.

Therefore, A solution is prepared by dissolving 23. 7 g of cacl2 in 375 g of water. The density of the resulting solution is 1. 05 g/ml. The concentration of cacl2 is 0.5623 % by mass.

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Most of the energy released in citric acid cycle reactions is conserved in NADH.

What is NADH?

Nicotinamide adenine dinucleotide is a central coenzyme of metabolism. NAD is found in all living cells and is called a dinucleotide because it consists of two nucleotides joined by a phosphate group. One nucleotide contains one adenine nucleobase and one nicotinamide.

NADH stands for "Nicotinamide Adenine Dinucleotide (NAD) + Hydrogen (H)", which occurs naturally in the body and is involved in energy production. NADH produced by the body is involved in the production of energy in the body. Taking NADH supplements can affect blood pressure and have other effects.

Therefore, Most of the energy released in citric acid cycle reactions is conserved in NADH.

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Every stage of energy metabolism, including glycolysis, beta-oxidation, and the tCA cycle, involve magnesium mineral.

Using ATP, several of the pathway's intermediates are converted to succinyl CoA and succinic acid during the anabolic (energy-consuming) phase of the cycle. Due to the fact that energy is both created and consumed throughout the TCA cycle, it is dubbed an amphibolic cycle.

The TCA cycle generates NADH and FADH2 by oxidizing acetyl CoA obtained from carbohydrates, fatty acids, amino acids, and ketone bodies. Additionally, the TCA cycle offers the intermediates needed to produce glucose, lipids, and amino acids.

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Answer: 5.44 x 10^24

Explanation:

Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number:

1-To go from moles to molecules, multiply the number of moles

by 6.022 x 10^23.

2-To go from molecules to moles, divide the numbers of molecules

by 6.022 x 10^23.

Given number of moles (9.04) We can compensate directly using the formula (Moles equal number of atoms/molecules over Avogadro's number)

Number of molecules = 9.04 x 6.022 x 10^23= 54.43888 x 10^23

now applying significant figure rules the answer is rounded to 3 digits and wrote in scientific notation making the final answer 5.44 x 10^24

Answer:

oxygen<carbon<aluminium<potassium

Explanation:

atomic radius increases down the group but decreases across the period

Although the pKa constant is 4.8 and is a more straightforward expression, the Ka constant for acetic acid (CH3COOH) is 0.0000158 (= 10-4.8). Additionally, the strength of the acid increases with decreasing pKa values.

For instance, lactic acid has a pKa value of roughly 3.8, which indicates that it is a stronger acid than acetic acid.

Acetic acid, officially known as ethanoic acid, is an organic substance with the chemical formula CH3COOH that is acidic, colorless, and liquid (also written as CH3CO2H, C2H4O2, or HC2H3O2). Apart from water and other trace ingredients, vinegar has at least 4% acetic acid by volume, making acetic acid its primary ingredient.

The second-simplest carboxylic acid is acetic acid (after formic acid). It serves as a significant industrial chemical and reagent in the manufacture of cellulose acetate.

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The number of moles of hydrogen peroxide is  0.402 moles

Calculation:

Water volume, V = 20.1 mL.

MnO4 has a molarity of 0.020 M.

the quantity of potassium permanganate solution in moles.

Solution:

Molarity is determined by:

M = Volume in liters/Numbers of moles

0.020=n/20.1

n=0.020×20.1

n=0.402moles

As a result, 0.402 moles of potassium permanganate solution are present.

6.02214076 x 1023 of any chemical unit, such as atom, molecules, ions, and others, constitute a mole. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to utilize.

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Hazmat or lithium battery labeled order must be placed inside a well closed corrugate box  rather than a padded envelope. Thus, the statement is true.

Standard hazard class identifiers that adhere to guidelines are called Hazmat Labels. Each label has markings that specify the kind of hazard that is mentioned there.

They aid in determining the kind of hazardous item that is contained in a package. Hazardous material packaging, such as overpacks or UN-certified packaging, is given these hazmat labels and handling labels.

These labels are indicative of the danger associated with the chemicals inside and they have to well enclosed within a corrugate box.

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=》 ᴛʜᴇʏ ʟᴏᴏᴋ ꜰᴏʀ ᴛʜᴇ ᴅᴇᴄᴀʏ ᴘʀᴏᴅᴜᴄᴛꜱ. ᴛʜᴇʏ ʟᴏᴏᴋ ꜰᴏʀ ᴛᴇʟʟᴛᴀʟᴇ ꜱɪɢɴꜱ ꜰᴏʀ ᴡʜᴇɴ 115 ᴅɪꜱɪɴᴛᴇɢʀᴀᴛᴇꜱ, ʙʏ ᴡʜᴀᴛ'ꜱ ᴄᴀʟʟᴇᴅ ᴀʟᴘʜᴀ ᴘᴀʀᴛɪᴄʟᴇ ᴇᴍɪꜱꜱɪᴏɴ. ᴡʜᴇɴ ᴛʜᴇʏ ꜱᴇᴇ ᴇɴᴏᴜɢʜ ᴏꜰ ᴛʜᴏꜱᴇ ꜱɪɢɴᴀʟꜱ, ᴛʜᴇʏ ᴄᴀɴ ꜱᴀʏ ᴛʜᴇʏ ᴘʀᴏʙᴀʙʟʏ ꜰᴏʀᴍᴇᴅ ᴀ ɴᴇᴡ ᴇʟᴇᴍᴇɴᴛ.

Answer:

[tex]40.08 \: grams[/tex]

Explanation:

Therefore, 0.27 moles of calcium to grams is the game as 0.27 moles of Ca to grams, 0.27 moles of calcium to g, and 0.27 moles of Ca to g. Furthermore, the atomic mass of calcium is 40.08. That means that one mole of calcium weighs 40.08 grams (40.08 g/mol).

The lewis structure for carbon tetraiodide, which contains one carbon and four iodine atoms is carbon has four electrons in its valence shell(2s22p2).

Lewis structures, also known as Lewis dot formulas, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that show how atoms interact with one another inside of molecules as well as any lone pairs of electrons that may be present. Lewis structures can be found in coordination compounds as well as any molecule having a covalent bond. The Lewis structure was initially introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule. Lewis structures expand on the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.

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The element that most likely creates a compound using oxygen with a chemical formula that is similar to that of the

Atoms of various elements are combined chemically in a predetermined ratio to form a compound. A pure chemical composition made up of only one type of atom is referred to as an element. Composition. Different elements are arranged in compounds in a certain sequence and fixed ratio through chemical bonding.

(KOM-pownd) a material created by joining two or more distinct elements chemically in science. Examples of compounds are sodium chloride (NaCl), which is generated from of the components sodium and chloride, and water (H2O), which is created from the components hydrogen and oxygen.

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The molecular weight (g/mol) of a gas if 35.44 g of the gas stored in a 7.50 l tank exerts a pressure of 60.0 atm at a temperature of 35.5 oc is 1.99 g per mole.( By the ideal gas equation).

the ideal gas law: PV = nRT

P=60.0 atm, V = 7.5 L, T = 35.5 oC = (35.5+273) K = 308.5K

n = 35.44g

PV/RT =n

(60.0)(7.5)/0.821)(308.5) = 17.8 mol

M = 35.44/17.8 = 1.99 g/mol.

Boyle's Law tells us, the volume of gas increases as the pressure decreases. Charles' Law tells us, the volume of gas increases as the temperature increases. And Avogadro's Law tell us ,the volume of gas increases as the amount of gas increases.

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Isopentyl acetate is found in organic layer.

In this procedure, the organic product is isolated from inorganic substances. The organic product will be soluble in an organic solvent (organic layer) while the inorganic substances will be soluble in water (aqueous layer).

Solvents with significant dipole moments, the ability to separate charges, and the capacity to dissolve ions and other polar compounds are known as polar solvents. They comprise bonds between elements like oxygen and hydrogen that have widely varied electronegativities.

Non-polar solvents are defined as solvents that are made up of atoms with marginally different electronegativities. They have bonds between elements like carbon and hydrogen that have similar electronegativities. bonds with other atoms. Bonds between atoms with similar electronegativities will lack partial charges.

due to presence of large alkyl chain in isopentyl acetate

isopentyl acetate acts as a non polar compound , so its readily soluble in organic solvents rather then polar aqueous solvent

so isopentyl acetate is found in organic layer.

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