draw the structural formula of 2-bromo-3,3,4,4- Tetra methyl hexane
​

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.

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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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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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:

Answer:

Iceberg

The boat floated higher on water than the iceberg.

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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Answer:

Listed below

Explanation:

COMPOUND

1. It is a pure substance.

2. It can not be separated by a physical method.

3. Element loses their properties in a compound.

4. Its composition is fixed throughout its mass.

5. It has a fixed melting point.

6.In nature they are homogeneous.

MIXTURE

1. It is an impure substance.

2. It can be separated by a physical method.

3. Substances forming mixture retain their properties.

4. It has no fixed composition.

5. It has no sharp melting point.

6. They can be homogeneous as well as heterogeneous in nature.

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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19) [Kr] 5s 4d05p³ is the electron configuration that is not valid and in which the configuration rule has been violated amongst all the options

In both the cases of atomic physics and quantum chemistry, this term electron configuration talks about the distribution of electrons of an atom or molecule in any atomic or molecular orbitals.

The formula for it is [tex]2n^2[/tex], where n is the shell number. The tables below list the shells, n values, and the total number of electrons that can fit.

More than eight electrons can fit into the shell one inside the outermost shell in transition metals. Consider argon (Ar).

Its 18 electrons are arranged in a 2-8-8 pattern. Scandium (Sc) contains 21 electrons and is only 3 places away, however its configuration is 2-8-9-2.

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Weight Doesn't change with location. (will NOT change if you take an object to Mars).

weight DOES change with location. (will change if you take an object to the Moon.

Mass Is a measure of amount of Matter in an object. Is a measure of the pull of Gravity on an object.

Weight Is measured with a scale,

Mass Is measured with a triple beam balance.

Mass Is used to calculate Density.

The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.

The triple beam balance is a typical instrument used to measure the mass of various objects. It consists of three beams, each of which is provided with a single sliding weight that has a size corresponding to the gradations of the notched scale on each beam..

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Engineers do to lower impact forces by increasing  the collision duration.

Any time two objects collide, a collision occurs. Conservation of momentum and conservation of energy are typically used to resolve collision-related problems.

Collisions can occur in two ways:

In elastic collisions, no energy is wasted to other forms and is entirely retained as kinetic energy. It follows that momentum and kinetic energy are both preserved.

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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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B

Matter is anything that can be touched physically. Everything in the universe (except energy) is made of matter, and, so, everything in the universe is made of atoms. An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.

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:

Wave length

Explanation:

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

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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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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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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The concentration of NO is obtained as 3.5 * 10^-3 M.

We can see from the question that the equation of the reaction has been give. We need to recall that the equilibrium constant shows us the extent to which the reactants have been converted into products.

The more the conversion of the reactants to products, the larger the magnitude of the equilibrium constant. We can now use the values as we have them to find [NO]

If Kc = 4.10 * 10^-4

4.10 * 10^-4 =  [NO]^2/[[tex]N_{2}[/tex]] [[tex]O_{2}[/tex]]

[NO] = √4.10 * 10^-4 * 0.2 * 0.15

[NO] = 3.5 * 10^-3 M

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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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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

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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The acceleration for the second part of the race is 0.3m/s².

Acceleration is the amount by which a speed or velocity increases. The acceleration can be calculated by dividing the speed of the object by the time taken as follows:

Acceleration = speed/time

According to this question, Sally is swimming 6 meters every 2 seconds, however, this increase in speed took 10 seconds.

The speed Sally is swimming is 3m/s i.e. 6/2. Hence, the acceleration can be calculated as follows:

Acceleration = 3m/s ÷ 10s

Acceleration = 0.3m/s²

Therefore, 0.3m/s² is the acceleration for the second part of the race.

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7 waters of hydration were attached to the  MgSO4.

1. 547 grams of hydrated mgso4 is heated in a crucible.

molecular weight of mgso4= 120 g/mol

let, x number of water molecule present in this hydrated mgso4

then, molecular weight = 18x +120.

MgSO4.X(H2O)-------> MgSO4 +X( H2O)

IF , n mole of hydrated mgso4 taken in the reactant side then , n mole of

anhydrous MgSO4 produce according to reaction.

n= 1. 547 /18x +120;

which is equal to mole of anhydrous MgSO4 that is

n=  0. 7554 /120;

by equating both equations

we get ,

0. 7554 /120 = 1. 547 /18x +120;

x= 7 (nearly.)

hence, 7 waters of hydration were attached to the  MgSO4.

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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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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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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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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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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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