Pick 1 answer, please help!

Answer:

c

Explanation:

Whatever is left :

42.9 - 6.6 - 23 = 13.3 kpa

Answer:

13.3 kpa

Explanation:

Answer:

7 covalent bonds

Explanation:

Answer:

In these compounds carbon, nitrogen, oxygen, and chlorine atoms have four, three, two, and one bonds, respectively.

Explanation:

I agree with the student's statement that states that ozone depletion is causing global warming.

Ozone layer depletion is the gradual thinning of the earth’s ozone layer in the upper atmosphere caused due to the release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities.

The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone and protects the earth from the harmful ultraviolet radiations of the sun.

Global warming is a sustained increase in the average temperature of the Earth, sufficient to cause climate change.

Greenhouse gases emitted into the atmosphere are the causes depletion of ozone layer, which in turn leads to global warming.

Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc.

Therefore, the statement made by the student is correct and I agree with it.

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The correct Answer is C. concentrated solutions.

The activities of all species tend to be smaller than the formal concentration solutions become more concentrated. The decrease in activity with increasing concentration is much more pronounced for ions than for neutral solutes. Chemists can use activities to explain various differences between ideal and real solutions. To describe a real solution, the mathematical description of an ideal solution must be modified, just as the law for ideal gases (PV = nRT) must be modified to describe real gases.

Activity measures how many particles "appear" to be present in the solution, as opposed to how many are actually present. As a result, activity acts as a "fudge factor" in ideal solutions, correcting the true concentration. agas is a unitless ratio. The ratio asolute has no units.

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If NADH from glycolysis is missing  then, glycolysis will not be able to continue.

As they return to glycolysis or the citric acid cycle, these low-energy molecules pick up more high-energy electrons that allow the process to proceed. If NAD+ is not present to pick up electrons as the reactions progress, neither glycolysis nor the citric acid cycle can occur.

The method by which glucose is metabolized to produce energy is known as glycolysis. It generates water, ATP, NADH, and two pyruvate molecules. There is no need for oxygen for the process, which occurs in a cell's cytoplasm.

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Kf, at 25 °C, is 713 for the reaction  M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l)

The chemical compound porphine, sometimes known as porphin, has the formula C20H14N4. It is the simplest of the tetrapyrroles since it is composed of four pyrrole-like rings connected by four methine (= C H ) groups to form a bigger macrocycle ring. The molecule is flat. It is categorized as a heterocyclic and aromatic chemical. The measure of a system's chaos is called entropy. It is an extensive characteristic of a thermodynamic system, which indicates that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the symbol S and is measured in joules per kelvin (JK1) or kg/m2/s2K1. The entropy of a well organized system is low.

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Among the given solvents, the protic solvents are CH₃OH, H₂O, CH₃CH₂OH, and aprotic solvents are DMF, DMSO and acetonitrile.

Protic solvents are those having free hydrogen atoms which are capable of forming hydrogen bonds through intermolecular mode. Whereas aprotic solvents are those having no free hydrogen atoms and are not capable of forming hydrogen bonds.

Water, alcohols, acids etc are protic solvents. These solvents furnish protons when ionized or dissolved in water. Aprotic solvents does not have free hydrogen to furnish.

Among the given solvents the protic solvents are  CH₃OH, H₂O, CH₃CH₂OH and the aprotic solvents are DMF, DMSO and acetonitrile.

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Answer:

A.

Explanation:

Ten cc propane would require 50 cc oxygen TO BURN ALL OF THE PROPANE; HOWEVER, some propane will burn if some oxygen is present. If less than 50 cc not all of the propane will burn.

The statement above which identifies the best phrase which describes the movement of air in general is: from high pressure to low pressure.

The correct answer choice is option a.

Air is regarded as a mixture due to the fact that it contains different substances such as carbon dioxide, oxygen, rare gases, dust, water , moisture and so on and so forth. However, air usually moves from high pressure to low pressure simply because as air particles warm, it usually ascends, leading to low pressure at the surface.

In conclusion, we can now confirm and deduce from the explanation given above that air too moves from one point to another.

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Matter is everything that occupies physical space. Everything on earth, including the atmosphere, that occupies space and has a certain mass is considered matter.

Anything that occupies space and has mass is considered to be matter. The world around you is composed of matter. A general phrase for the "stuff" all around you is matter. An item has a quantifiable size or volume when it occupies space. A measurement of matter's resistance to acceleration is its mass. Everything around us takes up space. Now, we are aware that matter refers to everything that takes up space. Atoms are the minuscule constituents of matter. Typically, we focus our studies solely on the three states of matter: solid, liquid, and gas.

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Answer:

H +O2 gives H20 means water

C + O2 gives Co means carbon monoxide

Al+ O2 gives Al2O3 means Aluminium oxide

Mg +O2 give MgO2 means magnesium hydroxide

Carbon-12 has a theoretical atomic mass of 12 grams (6 protons and 6 neutrons). This means that the atomic mass or atomic weight of carbon (12 grams) equals exactly 1 mole of carbon.

In the International System of Units, the mole (symbol mol) is the unit of substance amount (SI). The amount of substance is a measurement of how many elementary entities of a given substance are present in an object or sample.

An elementary entity can be an atom, a molecule, an ion, an ion pair, or a subatomic particle such as an electron, depending on the substance. For example, despite having different volumes and masses, 10 moles of water (a chemical compound) and 10 moles of mercury (a chemical element) contain equal amounts of substance, and the mercury contains exactly one atom for each molecule of water.

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To solve this, we need to have a clear concept behind reactions of chemical reagent. Therefore, the reagents can be filled in below given ways.

The word "reagent" refers to a chemical component (a compound or combination, often of inorganic or tiny organic molecules) injected into organic chemistry to produce the desired conversion of an organic material. Collins, Fenton, and Grignard reagents are among examples.

The reagent  needed to carry out each reaction are:

For first reaction, reagent needed are HBr and KOC(CH[tex]_3[/tex])[tex]_3[/tex].

For second reaction, reagent needed are TsCl, pyridine and KOC(CH[tex]_3[/tex])[tex]_3[/tex].

For third reaction, reagent needed are TsOH, NBS and KOC(CH[tex]_3[/tex])[tex]_3[/tex].

For first reaction, reagent needed are Cl[tex]_2[/tex],H[tex]_2[/tex]O, NaH and HBr.

Therefore, the reagents can be filled in above given ways.

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Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds.

Because of its small size and ability to tightly hang on to the shared pairs of electrons, carbon forms strong bonds with the majority of other elements.

Carbon is 2,4 in its electrical form. As a result, it typically creates covalent compounds because it is unable to add or subtract four electrons to complete an octet. Methane is a prime example of such a substance (CH4).

The electrons closest to the nucleus experience the least attraction from it, making them the most reactive. Valence electrons are these electrons. The most significant part of chemical bonding is played by them.

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The molarity of C2H5OH water solution which will freeze at -10 degree Celsius is 5.3 molar.

What is molarity?

A solution's molar concentration, also known as molarity, is the number of moles of solute present in a specific number of liter of the solution, or moles per liter.

Two indicators are used to measure it: the volume of the solution and the quantity of solute molecules. In essence, liter are used to measure the volume of the solution. "M" stands for "molarity."

According to the given question:

The depression if the freezing point

ΔTf = i ⋅ Kf ⋅m

ΔTf = -10 °C= 10 K = the depression if the freezing point

i = 1= van't Hoff's factor (ethanol is non electrolyte and does not dissociate in aqueous solution).

Kf =1.86 Kkg/mol= molal depression in freezing point constant

m= molality

ΔTf =i⋅ Kf ⋅m

10 K=1×1.86 K kg/mol × m

m=5.3 mol/kg=5.3 m

Hence, the molality of solution is 5.3 m.

Complete question:

What is the molality of C2H5OH in water solution which will freeze at -10 degree Celsius?

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Answer:

This lift usually comes from differences in air density. Warmer, less dense air rises upward, creating lift. As the air lifts higher and higher, it causes a storm cloud to grow taller and taller. Thunderstorm clouds can rise up to 10 miles into the air!

The unidentified compound's weight in the recipe is To find the fraction, divide the percentage by 100. 63.55 divided by the fraction equals the molecular weight. 225.4 atomic units.

It is utilized in pyrotechnics, pyrolysis, anti-fouling coatings, flame proofing, printing, photocopying, and electrolysis operations. The atomic number 29 and chemical symbol Cu are assigned to the element copper.

Cu2O, Cu2Cl2, and cuprous sulfide are a few of the significant commercial compounds of copper(I) (Cu2S). The mineral cuprite, which contains cuprous oxide as a reddish brown or red crystal or powder, naturally occurs.

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The concentration of the HCl (aq) solution was at least 1.0 M.

What is concentration?

The abundance of a constituent divided by the sum of the mixture's volumes is the definition of concentration in chemistry. There are several different categories of mathematical description: mass concentration, molar concentration, number concentration, and volume concentration

P = 0.095atm(corresponds to 0.20g of CaCO3

so,moles of CaCO3 =0.20g/100gmol⁻¹=0.002moles

moles of HCl =(molesₓCaCO3ₓ2)=0.002ₓ2

M=0.004/4ₓ100

Concentration of HCl=1M

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Yes, it will freeze at 0 degree Celsius. The correct option is A.

The temperature at which a liquid solidifies is known as the freezing point. Similar to the melting point, the freezing point typically rises with increasing pressure.

The freezing point depression equation must be used to calculate the freezing temperature of a solvent and solute mixture. You can use this equation to determine how adding a solute alters a solvent's freezing point.

ΔTf = Kf x molality

Here,

Mass of the solvent = 100 mL x 1 g/mL = 100 g

Molality of the solute = 10 g / 58.44 g/mol = 0.171 mol

Molality of the solvent = 0.171 mol / 100 g = 0.00171 mol/g

So,

ΔTf = 1.86 °C/m x 0.00171 m = 0.00316 °C

Thus, the correct option is A.

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Exposure route can be defined as a way by means of which a person can come in contact with the hazardous chemicals, this can be prevented by wearing personal protective equipments.

Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.

It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.

It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.

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CH3O Lewis dot structure has two lone pairs, one single electron, and a negative charge. The central atom, carbon does not hold any lone pars as after binding the compounds get filled valence shells with the help of electrons shared by Hydrogen and Oxygen atoms.

In his idea of cubic atoms, Lewis developed the "octet rule." The preference of atoms to have eight electrons in the valence shell is referred to as the "octet rule." Atoms with fewer than eight electrons have a propensity to interact, resulting in the formation of more stable compounds. The most stable state that atoms can achieve through their reactions. Two dots or a line (Kekulé structures lines) between the connected atoms serve as representations of bonds, which are made up of two shared electrons. Using two and three lines/(pairs of electrons), respectively, double bonds and triple bonds are shown. A Lewis dot structure is based on the octet rule, which states that atoms share electrons so that each has eight electrons in its outer shell

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From strongest to weakest bond strength: left to right:- Mg^2+ O^2 > Ca^2+ O^2- > Ca^2+ Se^2- >Li F^- > Na^+ F^- > Na^+ Br^- due to short Ionic Bond strength.

Bond energy, also known as mean bond enthalpy as well as average bond enthalpy, is a measure of the strength of a chemical bond. In chemistry, bond strength has been defined as the strength that a chemical bond contains two atoms together. This one is usually expressed in kilocalories per mole as the amount of energy needed to break the bond.

Due to the electrostatic attraction among its negative and positive ions, an ionic compound is stable. The lattice energy of an ionic bond is the amount of energy required to separate one mole of the a compound into its gas phase ions. Ions to higher charges as well as shorter distances between them have higher lattice energy.

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Land absorb more radiation from the solar energy than water and retains the absorbed heat.

As the earth surface is darker compared to the water surface, more radiations gets absorbed, so it heats up quickly. Water surface reflects most of the incoming radiations, so it takes longer for water to get heated. Also, it takes less energy to rise the temperature on land than water, because water has higher specific heat capacity. Also water cools downs slowly because of this.

Due to this difference in heating and cooling properties of land and water, the differences in temperature and air mass movement occurs across land and water. During day time, as it absorbs more radiations, the land gets heated up quickly and temperature of water changes only slightly. During night, the temperature of lands drops quickly, but water will retain the temperature for long period.

Thus land gains and lose heat quickly compared to water and this result in climatic changes across different areas.

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Answer: No

Explanation:

0.054 gm of of HI should be present in 0.300 l of solution to obtain a solution with each pH value.

A solution's pH is a measure of its hydrogen ion concentration, which is a measure of its acidity. Pure water dissociates slightly into hydrogen and hydroxyl (OH) ions in equal proportions.

In chemistry, pH is a scale used to quantify the acidity or basicity of an aqueous solution. It was traditionally denoted as "potential of hydrogen". The pH of acidic solutions is lower than that of basic or alkaline solutions.

Indicators may be used to monitor pH since their colour varies as the pH changes. A visual comparison of the colour of a test solution with a standard colour chart allows for precise pH measurement to the closest whole integer. Color may be quantified more precisely if it is measured spectrophotometrically with a colorimeter or spectrophotometer.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, when the pressure decreases, molar volume increases. Ideal gas is a hypothetical gas.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 Latm/Kmol

According to above equation we can see that pressure is inversely proportional to volume. On decreasing the pressure, volume will increase.

Therefore, when the pressure decreases, molar volume increases.

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Answer:

A. molar volume increases

Explanation:

Checked on edge.

Answer:

The best conductor is Copper

Explanation:

because it's able to generate more heat than the other 2

A polar covalent bond.

Polar covalent bond:

A covalent bond in which the electron density is unevenly shared between the two bonded atoms, due to a difference in electronegativity or due to inductive effects.

There is a bond between the atoms, and electrons are shared, but they are pulled more closely towards one of the atoms in the bond. The atom that pulls the electrons more closely has a slight negative charge, and the other atom has a slight positive charge in the opposite direction.

In HBr, both H and Br are nonmetals so the bond must be covalent. The difference in their electronegativities is:

ΔE = |EN(H)-EN(Br)| = |2.20-2.96| = 0.76

Hence this bond recognized as Polar covalent bond.

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Atoms will combine with each in order to become more chemically stable. Compounds are formed between two atoms that have incomplete outer energy levels. The two types of compounds that can be formed between atoms are ionic and covalent. Ionic compounds are formed between two oppositely charged atoms. ionic compounds contain a metal ion and a non - metal ion:

Metals will lose electrons to form positive ions and nonmetals will gain elections to form negative ions. These oppositely charge ions are very attracted to each other and forms very strong bonds as a result.

Ionic compounds are characterized by crystalline structure.

High melting and boiling points, and are solids at room temperature.

Two non-metals will combine to form covalent compounds. Covalent compounds are formed when two atoms share one or more pairs of electrons The force of attraction between the main relatively weak. Covalent compounds are characterized by low melting and boiling points, and can be gases, liquids and soft solids at room temperature.

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