Combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. Calculate the empirical formula for fluorene.

The mass in grams of sucrose that should be burned to raise the temperature of the calorimeter and its contents from 23.0°C to 50.0°C is 3753.5 grams.

The total heat absorbed by the calorimeter and its contents is calculated as follows:

Heat absorbed by the water = m*c*Δt

where;

m is mass = 0.600 kg or 600 g

c is the specific heat of water = 4.184 J/g°C

Δt is the temperature change = (50 - 23)°C or 27°C

Heat absorbed by the water  = 600 g * 4.184 * 27

Heat absorbed by the water = 67.78 kJ

Heat absorbed by the calorimeter = c * Δt

where;

c is the heat capacity of the empty calorimeter = 1.23kJ/°C

Δt is the temperature change = (50 - 23)°C or 27°C

Heat absorbed by the calorimeter = 1.23 * 27

Heat absorbed by the calorimeter = 33.21 kJ

Total heat absorbed by the calorimeter and contents = 33.21 kJ +  67.78 kJ

Total heat absorbed by the calorimeter and contents = 100.99 kJ

1 mole of sucrose evolves 5.65 kJ of heat

Moles of sucrose required = 100.99/5.65

Moles of sucrose required = 17.874 moles

Mass of sucrose required = 17.874 moles * 210 g/mol

Mass of sucrose required = 3753.5 grams

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A) Answer- 3-methyl-hex-3-ene, B)Answer- 8-methyl-4-nonene, C)Answer- 9-bromo-2-nonene, D) Answer- 2,4-dimethyl-1-pentene, F) Answer- Pent-2-ene are the names of the compounds.

A chemical compound is a substance made up of two or more different elements chemically bonded together. The elements in a compound are always present in a fixed ratio, and the properties of the compound are different from those of the individual elements. The bond between the atoms in a compound is called a chemical bond.The simplest example of a chemical compound is water (H2O), which is composed of two hydrogen atoms and one oxygen atom. Another example is table salt (NaCl), which is made up of one sodium atom and one chlorine atom. Compounds can be classified into different types, such as organic compounds, inorganic compounds, acids, bases and salts.Chemical compounds can be represented by a chemical formula, which shows the elements present in the compound and their ratio. The chemical formula for water is H2O which means that it is composed of two atoms of hydrogen and one atom of oxygen.

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A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. 640.51 g would a 14.79 cm length of the same iron rod weigh.

First, we know that there are 0.035273 ounces in a gram, so we can convert the weight of the one-inch-long segment of iron from ounces to grams by multiplying by 0.035273.

3.88 ounces * 0.035273 = 137.7 grams

We can use this conversion factor to calculate the weight of the 14.79 cm segment of iron:

137.7 grams * (14.79 cm / 2.54 cm) = 664.6 grams.

The correct answer is c. 640.51 g

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A segment of an iron rod that is one inch long and 3.88 ounces thick has a consistent density. A 14.79 cm length of the identical iron rod would weigh 640.51 g.

First, we can convert the weight of the one-inch-long iron fragment from ounces to grammes by multiplying by 0.035273, as we are aware that there are 0.035273 ounces in a gramme.

3.88 ounces times 0.035273 equals 137.7 grammes.

The weight of the 14.79 cm segment of iron can be determined using the following conversion factor:

(14.79 cm / 2.54 cm) x 137.7 grammes equals 664.6 grammes.

The right response is c. 640.51 g.

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Answer:

Atoms and molecules are matter

Explanation:

Matter is anything that have mass and occupies space

The rate of effusion of nitrogen gas is 0.98[tex]\frac{mol}{min}[/tex].

The rate of effusion of sulphur dioxide gas, which has a mass of 64g, is 0.452; the rate of effusion of nitrogen gas, which has a mass of 14g, has to be determined.

The square root of the molar mass of a gas has an inverse relationship with the rate of effusion of that gas. As a result, the rate of diffusion or effusion of a molecule or mole of molecules is precisely proportional to the rate of movement.

Now, using the relationship between mass and rate of effusion.

[tex]\frac{rate}{rate1} =\sqrt{\frac{MM1}{MM} }[/tex]

rate= 0.452

M.M.=64g

M.M.1=14g

Putting the values of all variable in formula we get,

[tex]\frac{0.452}{rate1}=\sqrt{\frac{14}{64} }[/tex]

On solving we get,

rate1=0.98[tex]\frac{mol}{min}[/tex]

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Answer:

[tex]Na_{2} O[/tex]

Explanation:

To write the correct formula for sodium oxide, we can use the periodic table to see how many valence electrons they will lose/gain. Since sodium will lose one electron and oxygen will gain 2 electrons, you need two sodium for every oxygen ion. Therefore, the formula is [tex]Na_{2} O[/tex].  

These species are molecules

A molecule is a group of atoms held together by chemical bonds. Molecules are the smallest particles of a substance that retain its chemical properties, and they can be made up of single atoms, or multiple atoms of different elements. Molecules can range in size from single atoms up to complex structures containing hundreds of atoms.

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An invalid set of quantum number is n = 3 l = 3 ml = 2 ms = –½ (A+)

Several rules apply here:

n≥1 in integer increments.

l≥0 And has a ranger from 0 to n-1 in integer increments.

ml= (-l........+l)

ms = ± 1/2

The first three inputs n, l, and ml—define the specific orbital of interest, and the fourth input—ms—defines the number of electrons that can occupy that orbital.

For the format

(n,l,ml,ms)

n = 3 l = 3 ml = 2 ms = –½ is invalid because n=l (The principal quantum number (n) can not have a value of zero. Therefore, the permitted values for n are 1, 2, 3, 4, and so forth. Any integer between 0 and n – 1 can serve as the angular quantum number (l). For instance, if n = 3, l can only be one of 0, 1, or 2, but not three.)

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D) fertilizers from agricultural fields is one of the major pollutants of groundwater.

Fertilizers contain nutrients that plants need to grow, such as nitrogen and phosphorus, however, if not used or applied properly, it can run off into nearby bodies of water or seep into the groundwater. The excess nutrients can lead to algal blooms and eutrophication, which can harm aquatic life and make the water unsafe for human use.

While all of the options you provided can have negative effects on the environment, but fertilizers are specifically known to contribute to groundwater pollution.

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CH2O

Observe the numbers 8, 16 and 8.

The highest common factor of the three numbers is 8.

Hence, dividing the respective numbers by the highest common factor, it is 1, 2 and 1 respectively.

Therefore, the empirical formula is CH2O.

An aldehyde forms a carboxylic acid by E. Oxidation.

An aldehyde is a type of organic compound that contains a carbonyl group (-CO-) attached to a carbon atom that is also bonded to at least one hydrogen atom (H).

An aldehyde can be oxidized to a carboxylic acid by the addition of an oxygen atom to the carbon atom adjacent to the carbonyl group, this process is known as oxidation.

This is usually done with the help of reagents such as Chromium (VI) oxide (CrO3) or PCC (pyridinium chlorochromate). However, it should be noted that not all aldehydes can be oxidized to form carboxylic acids as some aldehydes are not stable enough to undergo oxidation.

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The corresponding ratio is 146/200, or 73% of the model is shaded. The comparable decimal is 0.73.

Part of a whole is represented by a fraction.

Given, a grid of one hundred squares. Shaded squares total 73.

We must determine what proportion of the model is darkened.

100 grids total, 73 of which are shaded.

The model is partially tinted (73%).

Find the comparable ratio of 73/100 now.

2 times both the numerator and denominator

73/100×2/2 146/200 The comparable ratio is 146/200.

This is the comparable decimal: 73/100=0.73.

The comparable fraction is 146/200.

Therefore, 146/200 is the corresponding ratio and 73% of the model is shaded. The analogous decimal is 0.73, and the equivalent fraction is 146/200.

It can be challenging to select the best modeling strategy when the dependant variable in a regression model is a proportion or percentage. Ordinary linear regression has a major flaw in that it can predict values that aren't feasible, such as values below 0 or above 1.

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False, If a hydrogen atom electron jumps from the n=2 orbit to the n=6 orbit, energy is released.

The energy of an electron in an orbit of the hydrogen atom depends on the principal quantum number (n). The energy increases with increasing the value of n. Here electron jumps from orbit with n=2 (lower energy) to an orbit with n=6 (higher energy). So energy has to absorb for this electron jump. So energy release is false.

The concentration of lithium sulfate is 0.513M if the total ion concentration is 1.54 M.

Lithium sulphate can dissociate into ions by the reaction

                       [tex]Li_{2}SO_{4}[/tex]     [tex]\rightarrow[/tex]    2[tex]Li^{+}[/tex]      +    [tex]SO_{4}^{2-}[/tex]              

Let us consider Lithium sulphate concentration is x mole/L.

So,                  x mole               2x mole       x mole      

Total ion concentration = (2x+x) = 1.54 M    (provided)

so, 3x  = 1.54 M and  x= 0.513 M

[tex]Li_{2}SO_{4}[/tex] concentration is 0.0513 M.

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The Lewis dot structure for Al3+, Mg2+, Se2-, N3- are attached.

It has a charge of 3+ because it is missing three electrons from its normal configuration, which makes its outer shell the same as that of neon. As a result, its outer shell is filled, giving it the appearance of having eight dots.

The concept of bond angle cannot be seen in the case of Mg2+ since no bonds are formed with any other atoms. Mg2+ ion hence lacks a bond angle.

Lewis dot structure of azide ion, N 3-, has a total of 3 * 5 + 1 valence electrons, which translates to a total of 16 electrons that can be distributed between its three centers.

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Option C: Sugar is most likely to dissolve in greater quantities in cold water.

Because of the energy released during intermolecular interactions between the polar water molecules and the slightly polar sucrose molecules, sugar dissolves in water. The energy required to destabilize the structure of both the pure solute and solvent is made up for by the weak bonds that develop between the solute and the solvent.

Because hot water has more energy than cold water, sugar dissolves more quickly in hot water. As water is heated, the molecules gain energy and move farther. As they move more quickly, they come into contact with the sugar more frequently, causing it to melt more quickly.

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Complete question is:

Which substance is most likely to dissolve in greater quantities in cold water?

a) potassium chloride

b) sodium chloride

c) sugar

d) oxygen

The number of wavelengths of a given element typically increases with the orbital number of the shell.

Wavelengths are measures of distance between successive wave crests (the peak of a wave) or troughs (the lowest point of a wave). They are commonly used to measure the size of electromagnetic radiation, such as radio waves, microwaves and light. Wavelengths are denoted by the letter lambda (λ) and are typically measured in meters

This is because each orbital has a different energy level, which allows for additional possible wavelengths of the element. As the orbital number of the shell increases, the number of possible wavelengths of the given element also increases.

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A compound is 42% sodium, 19% phosphorus, and 39% oxygen by mass. The empirical formula of this compound is Na₃PO₄. The correct answer is A.

The simplest whole number ratio of each atom in a compound is an empirical formula.

The mentioned percentages of all the elements could be taken as their grams if we assume that the compound weighs 100 grams.

To obtain the moles of each element, we first divide the grams of each by its atomic mass.

Moles Na = mass/ mass molar= 42/23 =1.83 moles Na

Moles P = mass/ mass molar= 19/31 =0.63 moles P

Moles O = mass/ mass molar= 39/216 =2.44 moles O

The next step is to calculate the mol ratio, which is done by multiplying each component's moles by the least one of them.

If we examine the moles of each, at least one of them will be P moles, which equals 0.613. Decide to divide each mole by 0.613.

Na = 1.83 / 0.613 = 3

P = 0.63/ 0.63 = 1

O = 2.44/ 0.63 = 4

Therefore, the empirical formula of this compound is Na₃PO₄.

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Yes, scientists can be more or less certain of their claims depending on the evidence they have.

This is because scientific claims are based on evidence and are subject to testing and evaluation. Scientists use various methods, such as experiments, observations, and data analysis, to gather evidence and test their claims. The more evidence a scientist has to support a claim, the more certain they can be of its validity.

However, even with strong evidence, scientific claims are always subject to revision or modification as new evidence becomes available. This is because scientific knowledge is constantly evolving and improving as new discoveries are made and old theories are revised or refined.

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The energy needed to decompose 10.8 grams of N₂O5 is 110 kJ.

It takes 110 kJ of energy to decompose 2 moles of N₂O5 (the molecular weight of N₂O5 is 108 g/mol). Since 10.8 grams of N₂O5 is equal to 0.1 moles, it takes 110 kJ of energy to decompose 0.1 moles of N₂O5, which is the same as decomposing 10.8 grams of N₂O5.

The moles of Al³+ are there in 3 moles of Al₂(SO4)3 is 0.14 mole.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.

The mole, which is denoted by the symbol "mol," is the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilogrammes of carbon 12.

No. of moles = mass / molecular mass

Given, mass of Al2(SO 4) 3 = 60g

Molecular mass of Al2(SO 4) 3

= 2 × 27 +3 ( 32 + 4 × 16 )

= 342g

moles of Al³+ = 60 /   342

= 0.14 mole

Thus, The moles of Al³+ are there in 3 moles of Al₂(SO4)3 is 0.14 mole.

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The scientist used Nitrogen (capitalized) in her experiment.

What is Nitrogen?

Nitrogen is a chemical element with symbol N and atomic number 7. It is a colorless, odorless, and tasteless gas that makes up 78% of Earth's atmosphere. It is in gaseous form and also the major constituent of the atmosphere. Nitrogen is an important component of proteins and DNA. Nitrogen is found in all living things, and it is used in the production of proteins, nucleic acids, and other important molecules. It is also used to make fertilizers, explosives, and other industrial products. Nitrogen is an essential element for plant growth, and it is used to produce ammonia, nitric acid, and other compounds.

In general, when referring to elements or other scientific terms it should be spelled with a capital letter, as that is standard for elements. So, it should be capitalized, so the correct answer is Nitrogen.

Therefore, Nitrogen (capitalized) is the correct answer.

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Approximately work done for the reaction  will be done 5 KJ.

CH4 (g) + 202 (g) CO2 (g) + 2H20 (0)

∆ng = 1-3 = -2

Work (W) = -∆ ng RT

W = - (-2) x 8.314 x 300/ 1000

W = 5 KJ

Work being done on the system is a good sign. If the system is doing the work, it has a negative sign. Consequently, there is a good sign in the energy coming into the elephant's front legs. When there are more moles of gaseous products than there are gaseous reactants in a chemical reaction, the system is said to have exerted work on the environment. I

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At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.

The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. The pH of a 0.10 M NaOH solution at 35°C is 12.68. The pH of a solution is related to the ionic product of water (Kw), which is defined as the product of the concentrations of the hydrogen (H+) and hydroxide (OH-) ions in the solution. At 35°C, the value of Kw is 1.16 x 10^-14.

At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.

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The Lewis Structures For The Formation Of CaS From The Calcium And Sulfur Atoms is attached.

The Lewis dot structure is a means to depict the valence electron of an element as a dot-shaped representation of the electron. Understanding the chemical formula of a covalent molecule is the primary benefit of having this information.

Calcium exists in CaS as the ion Ca2+, whereas sulfur exists as the ion S2. Sulfur receives two electrons from the calcium's outermost shell in exchange for those electrons.

Ca2+S2 is the Lewis structure that represents the production of CaS from the atoms of calcium and sulfur since this is the combination that results in the formation of CaS.

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The species N3- and O3 have the same molecular geometry.

N3- is a trigonal planar molecule with three bond pairs and no lone pairs of electrons on the central atom, which gives it a molecular geometry of trigonal planar.

O3, also known as ozone, is a bent molecule with two bond pairs and one lone pair of electrons on the central atom, which gives it a molecular geometry of bent.

CO2 is a linear molecule with two bond pairs and no lone pair of electrons on the central atom, which gives it a molecular geometry of linear.

Therefore, N3- and O3 have the same molecular geometry as they are both trigonal planar.

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Automobile exhaust emission of co2 (milligrams per mile) is a measure of a car's exhaust emission of carbon dioxide, which is measured in milligrams per mile. This is an example of quantitative data, as it is a numerical measure of the amount of carbon dioxide emitted.

Automobile exhaust emission of co2 (milligrams per mile) is a measure of a car's exhaust emission of carbon dioxide. This is an example of quantitative data, as it is numerical in nature, measured in milligrams per mile. Quantitative data appears in many forms, such as measurements, counts, or rankings. It is numerical in nature, and can be used to analyze and compare trends, or to generate statistical inferences. In this case, the quantitative data of co2 emission is used to calculate a car's environmental impact, and to compare emissions from different vehicles. This data can also be used to inform decisions about purchasing or maintaining a vehicle, and to identify areas where emissions can be reduced.

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The Lewis structure of [tex]IF2^{-1}[/tex] can be represented as, it contains one Iodine atom in the middle position and the two fluorine atom in the surrounding position.

The Lewis dot structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms. The ion involves a central iodine atom bonded to two fluorine atoms. The central iodine atom has two bonding groups and three nonbonding lone pairs of electrons, so the geometry of the molecule would be linear. Molecular geometry is the three-dimensional arrangement of the atoms that constitute a molecule. It includes the general shape of the molecule as well as bond lengths, bond angles.

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Answer: We would know whether an animal undergoes sexual reproduction if two parents are involved.

4350 sec long will it take to electroplate the utensil

Step1 Mass of gold = Surface areax Thickness x Density = 736 x .0025 x 19.3= 35.512 g

Step2 Au +3 + 3e ----> Au

Step3  (196.97/3) g of  Au is deposited by = 96500 coulombs

          35.512 g will be deposited by         =96500 x3x 35.512/196.97  = 52194.36 coulombs

Step4 Time taken   = 52194.36/12   = 4349.53 s = 4350 s

intend to electroplate a metal object with a surface area of 736 cm2 with gold, giving the surface an average thickness of 0.025 mm. Using an excess Au3 solution as a base and a 14 A continuous current,

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Salt (sodium lactate), water, or carbon dioxide gases are the products of a reaction that happens when hydrogen peroxide (sodium bicarbonate) or vinegar (acetic anhydride) are mixed.

One or more chemicals, also referred to as reactants, are transformed into one or more other substances, often referred to as products, in a chemical reaction. Substances are constructed up of chemical components or chemical elements. A chemical reaction occurs once a or more chemicals change into one or several other substances. An illustration of this is when iron and gas mix to produce rust. Vinegar and soda soda together result in the production of water, carbon dioxide, and sodium acetate.

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