6. A 100 mg sample of a compound containing C, H and O is analyzed. All the carbon is converted
to CO₂ with a mass of 176 mg of CO₂. All of the hydrogen is converted to H₂O with a mass of
36mg. Determine the empirical formula of the compound. What is the molecular formula if
there are 8 carbon atoms per molecule? What is the molar mass?

A wilting flower placed in water will be revived as water pressure in the plant cells increases. This change is brought about as a result of endosmosis.

Wilting means the loss of rigidity of the parts of the plant which are non-woody. This happens when the turgor pressure in the non-lignified cell declines toward zero, as a consequence of a lesser amount of water in the cells. If the concentration of water inside the cell is lower than that of the medium surrounding the cell, i.e. if the solution is very dilute. In this case, endosmosis will occur, the cell will get water by osmosis and the cell comes to be turgid.

The point at which the membrane of the cell pushes against the cell wall is called turgidity. This takes place when the turgor pressure is high. Now, to overcome wilting or increase the turgor pressure in cells, there are certain things to be done like supplying water, increasing the relative humidity of the surrounding, and by doing measures to stop transpiration, such as applying antitranspirants.

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The team's discovery on the various fabrics from conducting just this experiment is that A. The length of time it takes for the fabric to dry may vary depending on the type of fabric.

It was clear from the information that the swimming team wanted to choose one of three textiles for its new swimsuits. It should be emphasized that each fabric in this instance was manufactured from a unique material.

Each fabric was wetted with water in order to conduct the experiment, and identical-sized pieces were cut out to demonstrate this.

As a result, the experiment can demonstrate if the type of fabric impacts how long it takes for the fabric pieces to dry. As a result, given the information, option A is the best choice.

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Using the Arrhenius equation we can calculate the activation energy based on two reaction rate constants and respective absolute temperatures.

The order of the reaction is irrelevant for this calculation. The reaction rate constant is connected to the activation energy through the Arrhenius equation:

[tex]ln(\frac{k_{2} }{k_{1} } ) = \frac{-Ea}{R} (\frac{1}{T_{2} }-\frac{1}{T_{1} } )\\[/tex]

Where k1 and k2 are the rate constants (0.0796 [tex]M^{-1} s^{-1}[/tex] and 0.0910 [tex]M^{-1} s^{-1}[/tex], respectively), T1 and T2 are absolute temperatures at which the reactions are performed (1010 K and 1210 K, respectively), Ea is the activation energy and R is the universal gas constant (8.314 J/Kmol). If we plug our known values into this equation, we get:

[tex]ln(\frac{0.0910}{0.0796} )=\frac{-Ea}{R} (\frac{1}{1210K}-\frac{1}{1010K})[/tex]

[tex]0.1338 = \frac{1.637*10^{-4} Ea}{8.314 J/Kmol}[/tex]

From this, we can calculate Ea:

[tex]Ea = \frac{0.1338 *8.314 J/Kmol}{1.637*10^{-4} K^{-1} } = 6795 J/mol[/tex]

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If 89.5 grams of silver is produced, 105.45 grams of Cu reacted.

The Chemical equation is

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

The equation is balanced,

89.5 grams of Silver is produced in the reaction.

It is asked that how much Cu will be produced.

The amount of Copper can be calculated by using mole concept,

From the reaction,

When 1 moles of Copper Reacts, 2 moles of Ag are formed.

So, we can say,

Mole of Cu (n) = 2 x Moles of Ag

Mole of a compound can be found by using the formula,

Moles = Given mass of compound/Molar mass of the compound

So,

n = 2 x 89.5/107.87  moles

n = 2 x 0.82 moles

n = 1.64 moles.

Moles of Copper are 1.64.

So, the mass of Cu reacted will be

1 mole Cu = 63.55 grams

1.64 moles Cu = 1.64 x 63.55 grams

1.64 moles of Cu = 105.45 grams.

To produce 89.5 grams of silver, 105.45 grams of Copper would have reacted.

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The catalyst be recognized in the mechanism if the catalyst is used and then regenerated in a later step.

What is catalyst?

The process of catalysis involves introducing a catalyst to a chemical reaction to increase the speed of reaction. Catalysts are not destroyed during the reaction and are unaffected by it. Very little amounts of catalyst are frequently sufficient if the reaction proceeds quickly and the catalyst recycles quickly.

Chemical reactions and the movement of reactants and products both take place during the catalyst regeneration process. The diffusion resistance of oxygen into the pores, according to some research (such as Müller et al. (2010)), has a significant impact on the actual pace of coke combustion. Additionally, according to Tang et al. (2004), the coke concentration profile in a catalyst particle during combustion may not be uniform.

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According to the given statement the molarity of the iron(ii) solution is 0.72 M.

Molarity (M), which is determined by dividing the solute's mass in moles by the the solution's volume in liters, is the most widely used unit to represent solution concentration: litres of solution/moles of salt equals M. One liter of a solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.

Volume of iron(II) solution (V₁) = 25.0 mL = 0.025 L

Molarity of iron(II) solution (M₁) = ?

Number of moles of iron(II) solution (n₁) = ?

Volume of dichromate solution (V₂)

= 18.0 mL

= 0.018 L

Molarity of dichromate solution (M₂) = 0.175 M

Number of moles of dichromate solution (n₂) = ?

Molarity of dichromate solution is given as:

M[tex]_2[/tex] = n[tex]_2[/tex]/V[tex]_2[/tex]

n[tex]_2[/tex] = M[tex]_2[/tex] * V[tex]_2[/tex]

= .175 * 0.018

= 3.15 * 10^-3

Now, let us write the complete balanced reaction for the given situation.

So, the complete balanced equation is given below.

[tex]$6 \mathrm{Fe}^{2+}(a q)+\mathrm{Cr}_2 \mathrm{O}_7^{2-}(a q)+14 \mathrm{H}^{+}(a q) \rightarrow 6 \mathrm{Fe}^{3+}(a q)+2 r^{3+}(a q)+7 \mathrm{H}_2 \mathrm{O}$[/tex]

From the equation, it is clear that, 1 mole of dichromate is required for 6 moles of iron(II) solution.

To find the number of moles of iron(II) solution.

1 mole of dichromate = 6 moles of iron(II)

∴ n₂ moles of dichromate = 6n₂ moles of iron(II)

                                          = 6 * 3.15 * 10⁻³ = 0.0189 mol Fe²⁺

So, 0.016 moles of iron(II) is needed. Therefore,

Now, molarity of iron(II) solution is given as:

Molarity = Moles ÷ Volume

M[tex]_1[/tex] = n[tex]_1[/tex]/v[tex]_1[/tex]

M[tex]_1[/tex] = 0.018/0.025  = 0.72 M

The molarity of the iron(II) solution is 0.72 M.

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The length of the sheet of iron  must be 26 cm to buy a sheet of iron with a mass of 50,000 g.

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If Kp for the reaction at this temperature is 0.0118, then NO₂'s equilibrium pressure is 0.084 atm.

The equilibrium will move to the part of the reaction where there are less moles of gas as pressure builds up. The equilibrium will move toward the reactant side where there are more gas molecules when the pressure is decreased.

NO(g) + SO₃(g) → NO₂(g) SO₂(g)

Initial:                 0.86       0.86        0          0

Change:              -x             -x         +x        +x

Equilibrium:    0.86-x      0.86-x      x           x

Given the data provided, the expression for Kp is as follows:

Kp = [NO₂] [SO₂] / [NO] [SO₃]

Kp = x.x / (0.86-x)²

The answer's value for Kp is 0.0118.

We plug this value into the equation above

0.0118 = x² / (0.86-x)²

When the quadratic equation is solved, the value of x is found to be 0.084 atm.

As a result, NO₂ has an equilibrium pressure of 0.084 atm.

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The oxidation number of S in [tex]SO_4^{2-}[/tex] is + 6 and C in [tex]C_2O_4^{2-}[/tex] is + 3.

The charge an atom would have if it were an ion in the molecule is what is known as the oxidation number of that atom. An atom in a neutral compound made up entirely of atoms of one element has an oxidation number of 0.

The oxidation number, sometimes referred to as the oxidation state, is the total number of electrons that an atom gains or loses in order to form a chemical bond with another atom.

The loss of negatively charged electrons causes an increase in oxidation number, whereas the addition of electrons causes a decrease in oxidation number. The oxidized element or ion's oxidation number increases as a result.

Oxygen's oxidation number, O = - 2.

Use:

4 x oxidation number (O) + 1 x oxidation number (S) = net charge

4 x (-2) + 1 x (S) = - 2

- 8 + S = - 2

S = + 6

So, oxidation number of S in [tex]SO_4^{2-}[/tex] = + 6

Oxygen's oxidation number, O = - 2.

Use:

4 x oxidation number (O) + 2 x oxidation number (C) = net charge

4 x (-2) + 2 x (C) = - 2

- 8 + 2C = - 2

2C = + 6

C = + 3

So, the oxidation number of C in [tex]C_2O_4^{2-}[/tex] = + 3

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The number of electrons in each shell of an N-14 atom in the ground state is 7.

The N-14 atom is nitrogen isotope. It has seven protons and seven neutrons. N-14 is a neutral atom having seven electrons. An atom's first shell has only two electrons which occupies an s orbital.

The total number of neutrons which are present in the nucleus are equal to the difference among the atomic number and mass number of an atom.

The nitrogen-14 isotope is having mass number as 14 and an atomic number as 7.

Nitrogen-14 is one of two stable isotopes of nitrogen which are non-radioactive. It makes about 99.63% of nitrogen which is naturally present. Nitrogen-14 is stable nuclides which have both an number of seven protons and seven neutrons. It is the only one which forms up more than half of its element.

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The Pressure of the new volume of nitrogen gas, P₂= 312.5 kPa.

In a sample of nitrogen gas, given  Pressure P₁= 625kPa and Volume V₁ = 40 cm³

In final conditions, V₂ is doubled = 80 cm³

Let Final pressure be P₂.

Since, temperature remains constant consistent with the Boyle's Law that states the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain constant.

Hence, P₁V₁ = P₂V₂

∴ 625 ×40 = P₂ ×80

[tex]P_{2} = \frac{625*40}{80}[/tex]

P₂ = 321.5 kPa

Hence, The final pressure obtained of nitrogen gas when volume is doubled at constant temperature is 312.5 kPa.

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Jess set up an experiment to test the outcomes of different potting soils protected with paper mulch on bean plants: An test changed into set up to test the hypothesis that every one plants will develop faster in a "first rate soil" versus ordinary potting soil. A based variable is a variable being examined in a scientific test.

An experiment is a manner executed to support or refute a speculation or determine the efficacy or likelihood of something previously untried. Experiments offer insight into cause-and-impact by way of demonstrating what final results take place when a specific element is manipulated.

An experiment is an investigation in which speculation is scientifically tested. The test manipulates a biasing variable (motive) and measures a fixed variable (effect). All external variables are controlled. The bonus is that the experiment should be the goal. Experiments can provide clues about the form or mathematical form of a principle, as well as provide evidence about the lifestyle of the individuals considered in our theory.

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Based on the number of electrons required and the strength of the electric current, we can calculate that the time needed to recharge the battery will be 1 hour, 9 minutes, and 23 seconds.

First, we calculate the number of moles of lead oxidized to lead(II) sulfate.

n = m/M = 0.63 g / 207.2 g/mol = 0.00304 mol

Then, we calculate the number of electrons needed to reduce this amount of lead(II) back into the elemental lead (each lead(II) ion requires two electrons):

[tex]N = 2 electrons * 0.00304 mol * 6.02 *10^{23} mol^{-1} = 36.6 * 10^{20} electrons[/tex]

Now that we know the number of electrons required, we can divide that amount by the strength of the electric current used to calculate the time required to recharge the battery:

[tex]t = N / I = 36.6*10^{20} electrons / 0.140 A = 36.6*10^{20} electrons / 0.140 * (6.28*10^{18} electrons/s) = 4163 s[/tex]

Because 1 hour has 3600 seconds, and a minute has 60 s, the time required will be 1 hour, 9 minutes, and 23 seconds.

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Answer:

A piece of rough sandpaper

Explanation:

Since sandpaper is rough, it exerts more friction, whereas the other options are smooth so they exert less/no friction.

Since the water increased by 7 degrees for the peanut and 3 degrees for the chip, the conclusion would be that the peanut has more energy than the chip.

Calorimetry is the science of measuring the quantity of energy, usually in the form of heat, that is released during a reaction.

In this case, the energy released by the peanut and the chip were measured using calorimetry. The energy released was captured by the water and helps raise the temperature of the water.

The more energy released by the substances, the more the temperature of the water is raised.

Thus, since the peanut raised the temperature of the water by 7 degrees while the chip was only able to raise it by just 3 degrees, one can effectively conclude that the peanut has more energy than the chip.

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In the experiment in which a scientist is testing if caffeine helps mice run games faster;

An experiment is a scientific test or study which is performed in order to prove or disprove a hypothesis.

Experiments can also be undertaken in order to further establish or improve upon already established.

Variables are those factors that are studied in an experiment.

In a scientific experiment, the following variables are present:

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Answer:

Wave length

Explanation:

Is the distance between each wave of and wider it is apart the less energy the wavelength contains.

Answer:

the eclipse shown in the diagran Lunar Eclipse

Explanation:

Because the moon is reflecting from the sun which is seen on the earth

Answer:

The Moon's surface gravity is about 1/6th as powerful or about 1.6 meters per second per second. The Moon's surface gravity is weaker because it is far less massive than Earth. A body's surface gravity is proportional to its mass, but inversely proportional to the square of its radius.

Explanation:

forward direction will the equilibrium shift .

2no₂(g) ⇌ n₂o₄(g)

∆h° for this reaction is < 0. if the volume of the container is decreased by ½ while the temperature is kept constant.

then,

k equivalent is inversely proportional to volume.

k eq ∝ 1/v in this reaction  (from coefficient of reactants and products)

if the volume of the container is decreased by ½ .

then, k eq increase 2 times.

k equivalent is greater than 1

this shows that equillibrium shift will take place in forward direction.

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Around 0.3 is a good r f value in order to ensure that a compound will elute over a reasonable timeframe and is denoted as option E.

This is referred to as retar-dation factor and it is commonly used in chromatography. It is the ratio of the solute's distance traveled to the solvent's distance traveled.

The rf value which shows that a compound will elute over a reasonable timeframe is 0.3 which is because if it is too low, the compound won't elute and if it is too high then it will run through the column too quickly.

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Answer:

Between genuine solutions and suspensions, colloids solutions and suspensions represent a middle ground. The colloid solution's solvent-dispersed particles' diameters range from 10 to 2000 A. Milk and butter are examples

Answer: The highest-level numbers are 1 through 7, so the electrons in the atom respond to the row inside the periodic table so where the atoms are supposed to belong.

Explanation:

The organic compound, carboxylic acid will be found in ethyl acetate.

Organic compounds are those compounds that are obtained naturally from living matter.

Organic compounds are mostly composed of carbon, hydrogen, and oxygen.

Organic compounds are generally covalent compounds. Hence, they are usually non-polar compounds.

Based on the principle of like dissolves like, organic compounds are usually soluble in non-polar organic solvents and insoluble in polar inorganic solvents like water.

Carboxylic acid is an organic compound.

Ethyl acetate is an organic compound.

Aqueous NaHCO₃ is an inorganic compound.

Hence, carboxylic acid will dissolve in Ethyl acetate.

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The number of positive ions in 2g boric acid = 5.78 × 10²² ions

The negative ions in 2g boric acid = 5.78 × 10²² ions

Boric acid, greater specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formulation B(OH)₃. It is able to additionally be referred to as hydrogen borate or boracic acid. it also includes encountered as colorless crystals or a white powder.

Boric acid = H₃BO₃

into ions = 3OH⁻ + 3B⁺

mass of boron = 11

              H = 3×1 = 3

               O = 3×16 = 48

The molar mass of boron = 11 + 3 + 48

                                  = 62 g

A mole of boric acid = 2/62

                                   = 0.032 mole

1-mole positive ions contains  = 3 ions

1-mole negative ions contains  = 3 ions

0.032-mole positive ions = 3 × 0.032 = 0.096

0.032-mole negative ions = 3 × 0.032 = 0.096

1 mole contains = 6.022 × 10²³

0.096 mole = 6.022 × 10²³ ×0.096 ions

                   = 5.78 × 10²² ions.

positive ions in 2g boric acid = 5.78 × 10²² ions

negative ions in 2g boric acid = 5.78 × 10²² ions

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Answer:

moscovium

Explanation:

The IUPAC requires an independent confirmation of the discovery of an element because with the help of IUPAC name we can easily determine the chemical name of the elements.

IUPAC name is defined as a nomenclature based on designating the longest single-bond-connected chain of carbons in a molecule, whether it is a continuous chain or a ring. The official naming guidelines are used to give organic compounds a standardized name known as the IUPAC nomenclature. Contrarily, common names are older, unofficial names given to organic compounds; yet, they are occasionally employed.

The names' suffixes reflect and uphold historical and chemical consistency as well: "-ium" for elements 113 and 115, as well as for all newly discovered elements in groups 1 to 16, "-ine" for element 117, which belongs to group 17, and "-on" for element 118, which is a member of group 18. The half-life of the most stable isotope of Moscovium, Moscovium-289, is around 220 milliseconds.

Thus, the IUPAC requires an independent confirmation of the discovery of an element because with the help of IUPAC name we can easily determine the chemical name of the elements.

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The correct statement among the options is that

Gina should put “rubber tires” under “Synthetic.”

Gina should put “starch” under “Natural.”

A polymer is a natural polymer if the polymer is only composed of the compounds that occur in nature. We know that there are several polymers that occur in nature and a lot of these naturally occurring polymers are also known to have biological origin and can even be found in the body of organisms as it were.

We know that a polymer is composed of small molecules that come together. These small molecules that come together are what we call the monomers that compose the polymer.

A polymer is synthetic if it is composed of the compounds that do no occur in nature. These are the polymers that are compose of the monomers that may be produced in the laboratory or are the products of other industrial process.

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Answer:

C & D

Explanation:

Gina should put “rubber tires” under “Synthetic.”

Gina should put “starch” under “Natural.”

Answer:

Iceberg

The boat floated higher on water than the iceberg.

The number of neutrons in the most abundant isotope of krypton according to the mass spectrum is 48.

The neutron is a subatomic particle with the sign n or n0, a neutral charge, and slightly more mass than a proton. Atoms' nuclei are made up of protons and neutrons. Except for basic hydrogen, every atom's nucleus contains a neutron, a subatomic particle. The name of the particle comes from the fact that it is electrically neutral and devoid of charge. The densest particles are neutrons.

A category of a subatomic particle having a positive charge is the proton. The strong nuclear force holds the protons together in the atom's nucleus. A subatomic particle with no charge is called a neutron (they are neutral)

You can find out how many protons, neutrons, and Z an isotope has in its nucleus by looking at its mass number A. Z is determined by the atomic number.

A = Z + number of atoms

krypton-84 So

A = 84

Number of neutrons

A - Z

= 48

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