If 84g of urea (CH4N2O) is dissolved in 1400. G of chloroform, what is the elevation in the boiling point? Kb for benzene is 2. 67 Co/m

The appearance of the solution may change slightly, depending on the initial color of the solution and the solubility of the products formed.

If 6 M NaOH is added instead of 6 M NH₄OH, the solution would become more basic. NaOH is a stronger base than NH₄OH and therefore would react more strongly with the K₂C₂O₄.

Balanced chemical equation for the reaction between K₂C₂O₄ and NaOH will be;

K₂C₂O₄ + 2NaOH → 2KOH + Na₂C₂O₄ + H₂O

As NaOH is added to the solution, it will react with K₂C₂O₄ forming Na₂C₂O₄, KOH and water. This will result in the production of more hydroxide ions, which will increase the pH of the solution.

However, the increase in pH will be noticeable and the solution may become more cloudy due to the formation of a precipitate of Na₂C₂O₄.

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Answer:

Nitrogen and Oxygen make up 99% of the Earths atmosphere. Then Argon makes up the rest of the atmosphere.

Answer: one calorie is equal to approximately 4.2 joules.

Explanation: one calorie is equal to approximately 4.2 joules. The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.

Cold water causes a strong reaction between all alkali metals. Each reaction results in the release of hydrogen gas and the production of metal hydroxide.

The six chemical elements that make up Group 1 ( Ia ) of the periodic table—lithium ( Li ), sodium ( Na ), potassium ( K ), rubidium ( Rb ), cesium ( Cs ), and francium—are together referred to as alkali metals ( Fr ). The name "alkali metals" refers to how they react with water to produce alkalies.

The elements in Group 1 are all extremely reactive. To protect them against air and water, they must be kept under oil when being stored. Group 1 elements produce alkaline metal hydroxides when they interact with water (with a pH above 7). They are known as "alkali metals" for this reason.

Thus, the elements in group 1 react with water to form a hydroxide and hydrogen gas is produced.

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Taking into account the reaction stoichiometry, 4.44 grams of NH₃ are needed to produce 120 grams of H₂O.

In first place, the balanced reaction is:

4 NH₃+ 5 O₂ → 4 NO + 6 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 108 grams of H₂O are produced from 4 moles of NH₃, 120 grams of H₂O are produced from how many moles of NH₃?

mass of NH₃= (4 moles of NH₃×120 grams of H₂O)÷108 grams of H₂O

mass of NH₃= 4.44 grams

Finally, 4.44 grams of NH₃ are needed.

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1 day = 1440 minutes

2 days = 2880 minutes

2 days = 62 words per minute× 2880 minutes

2 days = 178560 words

Therefore she can type 178560 words in 2 days if she can type at 62 words per minutes

Answer:

The energy absorbed in the first move is greater than the energy released in the second move

Explanation:

Electrons require (absorb) energy to move to a higher energy level when there is a large external heat source, the presence of an electric field or by colliding with other electrons

And the amount of energy absorbed by the electron is exactly equal to the change in the energy state between the initial energy level of the electron and the destination energy level

Therefore, given that the energy level of the electron at level 2 is higher than the energy level of the electron when at level 1, we have;

The difference in the energy level between level 4 and level 1 is greater than the difference in the energy level between level 4 and level 2 and more energy is absorbed and therefore, released when the electron moves from level 1 to level 4 than when the electron drops from level 4 to level 2.

The most likely result is that 'the energy absorbed in the first move is greater than the energy released in the second move'.

Answer:

C.

Explanation:

Luster

The set(s) of magnetically non-equivalent protons are found in (ch3)2chch2ch2cl is A. 3

The protons in a molecule are considered magnetically equivalent if they generate the same NMR signal. There are three types of magnetically non-equivalent protons in the compound (CH3)2CHCH2CH2Cl. The proton signals come from the various types of protons that are not chemically equivalent.

The chlorine and methyl groups have the same chemical environment in the molecule, with only the two adjacent CH2 groups presenting a distinct chemical environment. The protons on these groups are non-equivalent magnetically. In general, the number of non-equivalent protons depends on the number of different chemical environments present in the molecule.

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The order of the reaction with respect to nitrate ion is 2.3. The activation energy for this reaction is Ea = 148 kJ/mol.

1. The basic form of rate law for the given reaction is as follows:

\(Rate = k [NO3-][I-]^3[H+]^22\).

Given: doubling the concentration of nitrate ion causes the rate of reaction to quadruple.The order of reaction with respect to nitrate ion can be calculated using the formula;

\(k2/k1 = (2^n)\)

where,n is the order of reaction with respect to nitrate ion k1 and k2 are rate constants of reaction at the respective concentrations of nitrate ion.Substituting the values given in the question;

\(4 = (2^n)\)

The value of n can be obtained by solving the equation.

n = 2

Therefore, the order of the reaction with respect to nitrate ion is 2.3.

We can use the Arrhenius equation to calculate the activation energy of the reaction.

\(k = Ae^{(-Ea/RT)}ln\)

\(k = ln A - (Ea/RT)\)

Taking the natural logarithm of both sides of the Arrhenius equation will give the equation of the line in the form y = mx + b,

where y = ln k, x = 1/T, m = -Ea/R, and b = ln A.

The slope of the straight line is -Ea/R.

Therefore,-6114 = (-Ea/R)

Solving for Ea,

Ea = 148 kJ/mol

The activation energy for this reaction is Ea = 148 kJ/mol.

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Technician A is incorrect, and Technician B is partially correct as DOT 4 has a lower boiling point than DOT 3.

Neither one of the experts is totally right. Dab 3 and Speck 4 brake liquids are glycol-based and have a higher limit than Dab 5 silicone-based brake liquid. In this manner, Specialist An is erroneous as Spot 5 has a higher edge of boiling over than Speck 3 and Dab 4 liquids.

Then again, Specialist B is wrong as Dab 4 brake liquid has a higher edge of boiling over than Spot 5 liquid, yet it is still lower than the limit of Speck 3 liquid. By and large, higher edge of boiling over brake liquid is alluring as it opposes disintegrating and brake disappointment under high-temperature conditions.

It means a lot to utilize the fitting kind of brake liquid determined by the vehicle maker to guarantee legitimate brake capability and security.

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Answer:

An example of an energy transformation that occurs in the natural world is the process of photosynthesis. In the Sun, chemical energy transforms into light and thermal energy. Plants transform the Sun's light energy into chemical energy during the process of photosynthesis.

Explanation:

The mοlecule that is expected tο exhibit resοnance is D. NO₃- (nitrate iοn).

Resοnance οccurs when there are multiple valid Lewis structures that can be drawn fοr a mοlecule οr iοn. In the case οf NO₃-, it has a trigοnal planar mοlecular geοmetry with three οxygen atοms bοnded tο a central nitrοgen atοm. The nitrοgen atοm fοrms a dοuble bοnd with οne οxygen atοm and single bοnds with the οther twο οxygen atοms.

The resοnance structures οf NO₃- can be represented as fοllοws:

O/NO-

In this case, the dοuble bοnd can be delοcalized οr shared amοng the three οxygen atοms, resulting in resοnance.

Therefοre, the cοrrect answer is D. NO3-.

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Answer:

a molecule of an element is called atomicity

Explanation :

The statement that is true of CFCs is that they are an industrial chemical that was once used as a refrigerant.

The correct option is option D.

What are CFCs?

CFCs (Chlorofluorocarbons) are a group of human-made organic chemicals that have been used since the 1930s, mostly as refrigerants, solvents, and propellants.

They are composed of carbon, chlorine, and fluorine atoms, and they have low toxicity, lack color and smell, and are stable and nonflammable.

What are the effects of CFCs on the environment?

CFCs are a major cause of the Earth's ozone layer depletion.

They are broken down into chlorine radicals by UV radiation in the Earth's stratosphere. These chlorine radicals react with ozone (O3), causing it to be broken down into oxygen (O2) and chlorine monoxide (ClO).

The chlorine monoxide then reacts with a free oxygen atom to create a chlorine atom and oxygen molecules. The chlorine atom then reacts with another ozone molecule, and the cycle repeats.

This is referred to as the catalytic destruction of ozone.

In addition to depleting the ozone layer, CFCs contribute to global warming by trapping heat in the atmosphere.

As a result, the production of CFCs has been banned in many countries since the signing of the Montreal Protocol in 1987.

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With the aid of an ice table and the acid dissociation constant of nitrogen acid, the pH of a solution containing 0.145 M nitrogen acid and 0.175 M sodium nitrite may be determined. The outcome is roughly 3.17.

The acidity, alkalinity, and neutrality of a solution can all be determined using the pH scale. At 25 °C, a solution with a pH of 7 or less is acidic, one with a pH of 7 or more is neutral, and one with a pH of 7 or more is alkaline.

The pH neutrality relies on temperature, falling below 7 if the temperature rises above 25 °C. The pH value is not limited to zero.

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Answer:

6x

Explanation:

Answer:

Δ

H

=

−

389 kJ

The liquid dispensed from a burette is called titrant. What is burette? A burette is a laboratory equipment used in analytical chemistry to dispense volumes of liquid precisely and accurately. A burette is used to deliver a variable, measured amount of liquid, and it is calibrated to enable a scientist to determine the volume of liquid it contains to an accurate level. What is titrant? Titrant is a liquid substance with a known concentration. Titrant is used in analytical chemistry to determine the concentration of an analyte (a chemical species under analysis). The amount of titrant required to react with a particular quantity of analyte is measured, and the concentration of the analyte is calculated from this titration.

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Concentration refers to the amount of solute present in a given volume of solvent. The concentration of a gas, on the other hand, can be measured in terms of the number of molecules in a particular volume of air. The concentration of CO2 in air is therefore 0.002%.

In order to calculate the concentration of CO2 in air, you would need to know the total number of molecules present and the number of CO2 molecules present. If there are 0.002 molecules of CO2 per 100 molecules of air, the concentration of CO2 in air can be expressed as 0.002%. This means that for every 100 molecules of air, there are two molecules of CO2 present. Concentration refers to the amount of solute present in a given volume of solvent. The concentration of a gas, on the other hand, can be measured in terms of the number of molecules in a particular volume of air. In order to calculate the concentration of CO2 in air, you would need to know the total number of molecules present and the number of CO2 molecules present. To calculate the concentration, you would use the following formula:
Concentration = (Number of CO2 molecules / Total number of molecules) x 100%
In this case, the number of CO2 molecules is 0.002 and the total number of molecules is 100. Therefore, the concentration of CO2 can be calculated as:
Concentration = (0.002 / 100) x 100% = 0.002%
This means that for every 100 molecules of air, there are two molecules of CO2 present. The concentration of CO2 in air is therefore 0.002%.

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Answer:

d

Explanation:

Emmett is lifting a box vertically. The forces that are necessary for calculating the total force is Fp and Fg. The correct option is D.

Force is an influence or strength that is used to initiate an action or movement. There are total eight types of forces are present.

Fp is the applied force and Fg is the force of gravitation, if Emmett is lifting a box vertically, these force will be applied

Thus, the correct option is D, Fp and Fg.

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Answer:

D

Explanation:

Edge 2022

Part 1: C represents the compound carbon dioxide (CO2),  in the given diagram of the question .

Part 2: One process that could release carbon dioxide into the air is combustion, which occurs when organic compounds (such as fossil fuels) react with oxygen in the air to produce carbon dioxide and water. Other processes that can release carbon dioxide include volcanic eruptions, natural decay of organic matter, and respiration by living organisms.

Part 3: The elements that form carbon dioxide, namely carbon and oxygen, are conserved during the carbon cycle. This is because carbon is constantly being exchanged between the atmosphere, oceans, and land through processes such as photosynthesis, respiration, and decomposition. When plants undergo photosynthesis, they take in carbon dioxide from the atmosphere and use it to build their biomass, incorporating carbon into their structures. When animals eat plants or other animals, they consume this carbon and release carbon dioxide back into the atmosphere through respiration. When organisms die, their bodies decompose and release carbon back into the environment. In this way, carbon is constantly being recycled through the carbon cycle.

The formation of carbon dioxide from the recycling of carbon occurs during cellular respiration, which is the process by which living organisms break down organic compounds (such as glucose) to release energy. During cellular respiration, carbon-based molecules are oxidized, or combined with oxygen, to produce carbon dioxide as a waste product. This carbon dioxide can then be released back into the atmosphere or taken up by plants through photosynthesis.

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The Earth's surface is not covered with the same materials ; however, some areas share similar materials.Several drilling sites have been dug in various regions of the planet to analyze the Earth's surface.

Each drilling site is unique, with differing characteristics and results. Despite these differences, all of the drilling sites analyzed offer scientists a more in-depth knowledge of the Earth's surface.In essence, the scientific drilling sites each had different lithologies, stratigraphies, and geologies. Each site had different types of rocks, depths, and ages, which led to varying drilling conditions, depths, and equipment used. Different types of equipment were also used to reach the depths required, which was a significant difference in each drilling site.The scientific drilling sites also had different purposes. Scientists had specific goals they wanted to achieve at each location. For example, the scientific drilling site in the Iceland region was focused on analyzing a unique layer of igneous rocks. The primary objective was to investigate the formation of the rock layer.The same materials were not found at each scientific drilling site.

Still, they had some similarities. They all provided geologists with vital information about the Earth's surface. The data provided from each drilling site was used to piece together the Earth's geologic history and how it has changed over time.

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Therefore, all you have to do is subtract 14 from the negative base-10 logarithm of the concentration of H+.

Simply deduct the pH from 14 to obtain the pOH. Take the negative log of the hydroxide ion concentration to determine the pOH. Simply subtract pOH from 14 to determine the pH.

The acidity of the solution increases with the amount of [H+] ions present. The more [OH-] ions there are in the solution, the more basic it is. Water has a unique characteristic that, depending on what is dissolved, causes it to behave as either an acid or a base.

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Answer:52!

Explanation:

Answer:

Li2CO3+CaCl2=CaCO3+LiCl

5.22 moles of helium have a mass of 20.9 g.

The molar mass is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule.

We have 5.22 moles of helium and we want to convert it to grams. We will use the following expression.

m = n × M

m = 5.22 mol × 4.00 g/mol = 20.9 g

where,

5.22 moles of helium have a mass of 20.9 g.

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Answer:Tungsten is made of tungsten while Nichrome is made of nickel chromium. ... Tungsten is used to make filament of bulbs. Nichrome have high resistivity than tungsten.

Explanation:i hope u have a wonderful night and stay safe

Answer:

The answer is North

Explanation:

The direction of the field is taken to be the direction of the force it would exert on a positive test charge.