What mass of krypton gas has a volume of 2.33 L at 53°C and 311 kPa?

Answer:

The hydroxide [OH-] concentration of the solution is 1.26*10⁻⁵ M.

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.

POH indicates the concentration of hydroxyl ions [OH-] present in a solution and is defined as the negative logarithm of the activity of hydroxide ions (that is, the concentration of OH- ions):

pOH= -log [OH-]

A solution has a pOH of 4.90. Replacing in the definition of pOH:

4.90= -log [OH-]

Solving:

-4.90= log [OH-]

1.26*10⁻⁵ M= [OH-]

The hydroxide [OH-] concentration of the solution is 1.26*10⁻⁵ M.

Answer:

Rainfall can affect influent flow rate and compositions of wastewater, and thus further affect wastewater treatment performance and the effluent quality.

Explanation:

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question we have

\(density = \frac{100}{2.4} \\ = 41.66666...\)

We have the final answer as

Hope this helps you

Answer:

m = 673 g

Explanation:

We need to find the mass of 5.90 mol of \(C_8H_{18}\)

Molar mass of \(C_8H_{18}\) is:

\(M=8\times 12+1\times 18\\\\=114\ g/mol\)

Let m be the mass of 5.90 mol of \(C_8H_{18}\). Using mole concept to find it.

No of moles = mass/molar mass

\(m=5.9\times 114\\\\=672.6\ g\\\\\approx 673\ g\)

So, the required mass is 673 g. Hence, the correct option is (d).

Answer:

673 g

Explanation:

Answer:

The balanced chemical equation you provided is:

Zn + 2HCl → ZnCl₂ + H₂

From the equation, we can see that for every 1 mole of zinc (Zn) reacting, 1 mole of hydrogen gas (H₂) is produced. Therefore, the mole ratio of zinc to hydrogen is 1:1.

If you have 3 moles of zinc, you will produce an equal number of moles of hydrogen gas. Therefore, when 3 moles of zinc react with an excess of hydrochloric acid, 3 moles of hydrogen gas will be produced.

Explanation:

Answer: Silicon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Silicon go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.

Hope this helps! :)

Josef Loschmidt and Amedeo Avogadro were both scientists who made significant contributions to the understanding of basic molecular numbers, sizes, and reaction ratios.

In 1811, Amedeo Avogadro proposed that equal volumes of gases at the same temperature and pressure contain the same number of molecules. This became known as Avogadro's law, which laid the foundation for the concept of the mole.

Josef Loschmidt, on the other hand, made important contributions to determining the size of molecules. In 1865, Loschmidt used kinetic theory to calculate the number of molecules in one cubic centimeter of gas at standard temperature and pressure (STP). He estimated the number to be about 2.7 x 10¹⁹, which is close to the modern value of Avogadro's number.

The term "Avogadro's number" was not coined until the early 1900s, long after Avogadro's death. The name was proposed by French physicist Jean Baptiste Perrin in honor of Avogadro's contributions to the concept of the mole.

In my opinion, the name "Avogadro's number" is appropriate because Avogadro's law was the first concept to establish a relationship between the volume of a gas and the number of molecules it contains. Moreover, Avogadro's law played a crucial role in the development of the mole concept, which is essential in chemical calculations. While Loschmidt's contributions were also significant, he did not propose a fundamental law like Avogadro did. Therefore, I believe that naming the number after Avogadro is appropriate to recognize his contributions to this fundamental concept in chemistry.

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Answer:

We are accelerating when we are speeding up so A.

Answer:

Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Le Chatelier's Principle states that if a system at equilibrium is subjected to a stress, the equilibrium will shift in a direction that tends to counteract the stress and restore equilibrium

The chemical reactions involved in the addition of NH3(aq) or HCl(aq) to CuSO4 can be represented as follows:

CuSO4 + 4NH3(aq) → Cu(NH3)4SO4(aq)

When NH3(aq) is added to a CuSO4 solution, it reacts with the copper ions, forming the complex ion Cu(NH3)4^2+. This reaction consumes some of the Cu2+ ions in solution, causing the concentration of Cu2+ to decrease. To counteract this decrease, the equilibrium will shift to the right, resulting in more CuSO4 dissociating into Cu2+ ions and SO4^2- ions, according to Le Chatelier's Principle. This causes an increase in the concentration of Cu2+ ions, which is visible as a shift in colour from blue to deep blue.

Whereas, NH3(aq) acts as a ligand and forms a complex ion with the Cu2+ ion, leading to a decrease in the concentration of Cu2+ ions.

CuSO4 + 2HCl(aq) → CuCl2(aq) + H2SO4(aq)

When HCl(aq) is added to a CuSO4 solution, the H+ ions react with the SO4^2- ions to form H2SO4- ions, resulting in a decrease in SO4^2- concentration. To counteract this decrease, the equilibrium will shift to the left, resulting in more CuSO4 dissociating into Cu2+ ions and SO4^2- ions, according to Le Chatelier's Principle. This causes an increase in the concentration of Cu2+ ions, which is visible as a shift in colour from blue to deep blue.

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The chromatography experiment, the solvent front traveled a distance of 8cm, while the blue, pink, and orange substances traveled distances of 6cm, 5cm, and 4cm.

In a chromatography experiment, the distance traveled by the solvent front refers to the distance the solvent traveled from the starting point on the chromatography paper. In this particular case, the solvent front traveled a distance of 8cm.

During the experiment, different components or substances were separated based on their affinity for the stationary phase and the mobile phase. The substances of interest in this scenario are represented by blue, pink, and orange.

The blue substance traveled a distance of 6cm from the starting point, indicating that it had a moderate affinity for the mobile phase. The pink substance traveled a distance of 5cm, suggesting that it had a slightly lower affinity for the mobile phase compared to the blue substance. Lastly, the orange substance traveled a distance of 4cm, indicating that it had the lowest affinity for the mobile phase among the three substances.

These distances traveled by the substances provide valuable information about their relative polarities or molecular interactions with the mobile and stationary phases. By analyzing the relative distances traveled by the substances compared to the solvent front, researchers can gain insights into the chemical properties of the separated components.

In conclusion, in this chromatography experiment, the solvent front traveled a distance of 8cm, while the blue, pink, and orange substances traveled distances of 6cm, 5cm, and 4cm, respectively, indicating their varying affinities for the mobile phase.

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Answer:

3,4-dimethylhexane, CH3CH2CH(OH)CH3, CH3CH2CH(CH3)CH2CH2CH3

Explanation:

A chiral carbon atom is also referred to as a asymmetric carbon atom. This is a carbon atom that is bonded to four different substituents.

So what we need to do is to look at each compound and consider all the carbon atoms in each compound. Drawing out the full structural formula is very helpful here.

After drawing each structure out, we now look out for carbon atoms that have four dissimilar substituents. Those are the chiral carbons. If we do so for all the molecules listed in the answer, we will discover that each of them contains an asymmetric carbon atom.

Answer:

My celebrity crush is young Keanu Reeves and my favorite drink is matcha tea

Explanation:

Answer: I don't really have a celeb crush but my favorite drink is Mango Slushie with boba.

Explanation:

Temperature changes are one of the primary means by which chemists can determine whether a chemical reaction has occurred.

Chemists use the terms exothermic to describe a reaction that gives off heat and endothermic to describe a reaction that takes in heat. Exothermic reactions are more well-known. An exothermic reaction can be defined as a chemical reaction that releases heat or light to the surroundings. Combustion is an excellent example of an exothermic reaction. Combustion is exothermic because it generates heat, and the heat is transferred to the environment. Furthermore, the temperature of the reaction will rise in an exothermic reaction.

The test tube containing the endothermic reaction will feel cold to the touch because it is absorbing heat from its surroundings. When two chemicals react to form a solid, endothermic reactions are commonly used. The reaction will take in energy from the environment in this scenario, and the temperature will drop. To keep an area cold, endothermic reactions can be used. Mixing four substances and measuring the temperature is a lab activity that is used to determine whether a chemical reaction is exothermic or endothermic.

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The opposite of the words given include the following below:

a. boiling - cooling

b. melting - freezing.

This is referred to as a physical process which involves the conversion of a solid to a liquid such as from ice to liquid water.

The opposite of this is freezing which involves solidification and can be described as the conversion of a liquid to solid.

Boiling on the other hand involves the application of heat to a substance while the opposite will be reduction of heat which is referred to as cooling thereby making them the correct choices.

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Answer:

Manganese is a chemical element with symbol Mn and atomic number 25.

Explanation:

Atoms of manganese in 1.00 g is 6.022×10²³

An atom is any particle of matter at its most basic level which contains at least one proton. Here are some examples of the atoms: hydrogen (H) and neon (Ne).

Atoms are made up of three particles known as subatomic particles: protons, neutrons and electrons.

To find the number of atoms  given mass multiplied by the Avogadro number

given mass = 1g

Avogadro no. = 6.022×10²³

number of atoms = 1 × 6.022×10²³ = 6.022×10²³

Thus, the number of manganese atoms is  6.022×10²³

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The concept that refers to the likelihood that certain sounds will follow each other in language is called phonotactics.

Phonotactics are the set of rules that govern the order of phonemes in a language. It is the study of the way in which sounds and phonemes are arranged in a language. The principles of phonotactics vary depending on the language. Every language has its own set of phonotactic rules, and a speaker of the language must follow these rules to generate intelligible utterances. Phonotactics include features such as syllable structure, stress patterns, tone, and intonation.

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According to stoichiometry and balanced chemical equation 10 iron atoms  react with 30 molecules of chlorine.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important in balancing chemical equations.It is useful in chemical calculations while making solutions of different concentrations.

Two atoms of iron reacts with 6 molecules of chlorine , so  for 30 molecules of chlorine it is, 30×2/6=10 atoms of iron.

Thus, 10 atoms of iron will react with 30 molecules of chlorine.

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The ionic bond between Na and P has formula unit Na3P.

What is the formula unit?

Formula units is the chemical formula which gives all the ions present in the lowest ratio possible to make it neutral charge of an ionic compound. For example, the formula unit for sodium chloride can be written as NaCl where charge on Na is +1 and charge on Cl is -1. So to make it neutral they can be cancelled and written as NaCl.

In sodium phosphide, the charge on Na (sodium) ion is +1 and the charge on the P (phosphorous) ion is -3. Therefore, make the charges neutral, 3 Na ions need to be added to 1 P ion. Formula units can be used to describe or represent the molecules or the elements which make up a substance.

Hence, Na3P is the formula unit of Na and P in sodium phosphide.

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The key differentiating factor between a nonpolar covalent bond and a polar covalent bond is the unequal sharing of electrons.

i. Unequal sharing of electrons: In a nonpolar covalent bond, electrons are shared equally between the atoms. This occurs when the atoms have similar electronegativity, meaning they have similar abilities to attract electrons. As a result, there is no significant difference in the electron distribution, and the atoms do not acquire partial charges.

ii. Ions: Ions are charged particles that have gained or lost electrons. Unlike ionic bonds, which involve the complete transfer of electrons, covalent bonds involve the sharing of electrons between atoms. Therefore, the presence of ions does not differentiate between nonpolar and polar covalent bonds.

iii. Atoms of partial charge: In a polar covalent bond, there is an unequal sharing of electrons due to differences in electronegativity between the atoms. One atom has a stronger pull on the shared electrons, resulting in a partial negative charge (δ-) on that atom, while the other atom has a partial positive charge (δ+).

This imbalance in electron distribution creates atoms of partial charge.

Therefore, the key distinguishing characteristic between a nonpolar covalent bond and a polar covalent bond is the unequal sharing of electrons, leading to the development of partial charges on the atoms in a polar covalent bond.

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The displacement of an object that traveled 4m east , turned 90 degress and traveled 5m north is 6.40 m

Displacement of an object is defined as the change in position of the object. displacement is the vector quantity , which means it has magnitude as well as direction.

In the give case an object first traveled east 4m and then turn 90 degree an traveled 5m north , so, it makes a right angled triangle .

by applying Pythagoras's theorem to the triangle we get

displacement = \(\sqrt{(4m)^{2} + (5m)^{2} }\)

                       = \(\sqrt{16 + 25}\)  m

                       = \(\sqrt{41}\) m

                       = 6.40 m

Thus,The displacement of an object that traveled 4m east , turned 90 degress and traveled 5m north is 6.40 m.

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If the experiment is repeated at the pH 11 level, the enzyme activity will be less than at the pH 9 level.

We can arrive at this answer because:

In this case, we can say that if the experiment is repeated at pH 11, the enzyme activity level will be even lower, since from pH 5 onwards, as the pH rises, the enzyme activity goes down.

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Answer:

There are 10 oxygen atoms reacting for every six oxygen atoms produced in CO2

Explanation:

Ther

Answer:

can't do much

Explanation:

baking soda;8,alkaline

bleach:12,alkaline.

coffee:5.10,acidic

coke;coke,acidic

milk;6.9,acidic.

lemon juice;2,acidic

this is all i can do.

25 gigaseconds is equal to 2,500,000,000,000 centiseconds

The mass of carbon dioxide in this is 264 g according to the given data.

The molar mass is basically the total mass in grams of the atoms that make up a molecule per mole. Molar mass is measured in grams per mole.

Combustion is the process of burning glucose in the presence of oxygen.

The balanced reaction is

\(C_6H_1_2O_6+6O_2---- > 6CO_2+6H_2O\)

As a result, each mole of glucose requires six moles of oxygen molecules.

Glucose has a molar mass of 180g per mole.

As a result, the reaction will be completed, with one mole of glucose reacting with six moles of oxygen to produce six moles of Carbon dioxide and six moles of water.

Carbon dioxide produced mass = moles X molar mass = 6 x 44 = 264 g

Thus, 264g will be the mass of the carbon dioxide produced.

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When gasoline evaporates from a fuel gas can energy is released. Therefore, the correct option is option A.

Energy, which is observable in the execution of labour as well as through the emission of heat and light, is the quantitative quality which gets transmitted to a body as well as to a physical system in physics. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.  When gasoline evaporates from a fuel gas can energy is released.

Therefore, the correct option is option A.

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