Discuss two properties of the atomic structure of copper that make it a good conductor.

The another name for relative abundance is Percent Composition

So, option A is correct

The relative abundances of all the stable isotopes of an element always add up to 100% since relative abundances are typically reported as percentages. A weighted average of these numbers determines the average atomic mass of an element.

The fraction of an isotope that is present on earth is quantified as its percentage abundance. It provides the amount of that specific isotope. The fraction of an isotope species in relation to all other elements in nature is known as relative abundance.

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The ancestors of modern cyanobacteria performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.

Photosynthesis sustains life on Earth today by releasing oxygen into the atmosphere and providing energy for the food chain. The rise of oxygen-producing photosynthesis enabled the evolution of complex life forms such as animals and land plants about 2.4 billion years ago. An example of photosynthesis is how plants grow by converting sugars and energy from water, air, and sunlight into energy. (biology) The process by which plants and other photoautotrophic plants produce carbohydrates and oxygen from carbon dioxide, water, and light energy.

Photosynthesis is important for plants to produce the glucose needed to manufacture energy and cellular structures. Photosynthesis also produces the oxygen that both plants and animals need for cellular respiration to make ATP, a complex organic chemical that provides energy.

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Answer:

electrolytes

Explanation:

Explanation:

Using the law of the conservation of linear momentum P:

P_i = P_fP

i

=P

f

so:

M_mV_{mi}+M_pV_{pi} = M_sV_sM

m

V

mi

+M

p

V

pi

=M

s

V

s

where M_mM

m

is the mass of the man, V_{mi}V

mi

is the initial velocity of the man, M_pM

p

is the mass of the puck, V_{pi}V

pi

is the initial velocity of the puck, M_sM

s

is the mass of the puck and the man and V_sV

s

is the velocity of both after the collition.

Replacing values, we get:

(80kg)(0m/s)+(0.17kg)(20m/s) = (80kg + 0.17kg)V_s(80kg)(0m/s)+(0.17kg)(20m/s)=(80kg+0.17kg)V

s

Finally, solving for V_sV

s

:

V_sV

s

=0.0424m/s

Mass of potassium chloride (KCl) is 1.7 grams.

M(KCl) = 74.55 g/mol; molar mass of potassium chloride

V(KCl) = 650 ml = 0.65 l; volume of potassium chloride solution

c(KCl) = 35 mM = 0.035 M; concentration of potassium chloride solution

m(KCl) = c(KCl) × V(KCl) × M(KCl)

m(KCl) = 0.035 M × 0.65 l × 74.55 g/mol

m(KCl) = 1.7 g; mass of potassium chloride

Potassium chloride (KCl) is a salt with ionic bond.

Molecular weight is  the sum of the atomic weight values of the atoms in a molecule.

The concentration is the amount of solute that has been dissolved in a given amount solution.

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Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.

The secondary pollutants are the type of pollutants that are formed as a result of combination of two or more primary pollutants in the presence of sunlight.

Examples of secondary pollutants include the following:

Therefore, Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.

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The descending order of carbon-carbon bond length in C₂H₆, C₂H₄, and C₂H₂ is:-

C₂H₆, C₂H₄, C₂H₂

Hydrocarbons are compounds that consist of only hydrogen and carbon.

On the basis of the presence or absence of double bonds/triple bonds, they are of three types- alkanes, alkenes, and alkynes.

The comparison between alkanes, alkenes, and alkynes is given in the adjoining image.

We can see that the bond length in alkanes like C₂H₆ is 1.53 A which is greater than alkenes(C₂H₄) , 1.33 A which is still greater than alkynes(C₂H₂) with a value of 1.18 A.

Thus, The descending order of carbon-carbon bond length in C₂H₆, C₂H₄, and C₂H₂ is:

C₂H₆, C₂H₄, C₂H₂

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The 1 m solutions of C6H1O6 have the highest vapor pressure at a given temperature.

Vapor pressure is defined as the tendency of a liquid to convert into a vapor state. The vapor pressure depends on temperature, surface area, intermolecular forces, and the number of moles of a substance.

The higher the number of moles of particles in solute, the lower the vapor pressure and vice versa.

C6H12O6 has the highest vapor pressure among the given options because it has the lowest number of moles or particles in the solute. The remaining options have more moles of particles in the solute.

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Water has more structure than other liquids because of its ability to form hydrogen bonds. Because of this phenomenon, water expresses a relatively high density, which allows it to cushion and protect the body’s structures.

Water is a chemical element consisting of hydrogen and oxygen and exists in gaseous, liquid, and solid states. It is one of the most abundant and important compounds. It is a tasteless, odorless liquid at room temperature and has the significant ability to dissolve many other substances.

You may be surprised to learn that most of Liverpool's drinking water comes from two beautiful lakes, Llyn Celyn and Vyrnwy, 80km south of Wales. Both lakes supply millions of gallons of water to the city each day. In humans, it functions as both a solvent and transport mechanism, dissolving essential vitamins and nutrients from food and delivering them to cells. Our bodies also use water to flush out toxins, regulate body temperature, and support metabolism.

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Yes, I have tried eating delicious delicacies served in the school canteen during recess time.

The combination of these components in food produces different end products like vitamins, minerals, and many other nutrients which are beneficial for a healthy body.

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Answer:1,430,880 feet.

Explanation: You would multiply 271*5280 because there are 5280 feet in one mile. This equals 1,430,880 feet.

The answer of the the percentage of zinc in the alloy is 33.33%.

Mass percent is the mass of the element or solute divided by the mass of the emulsion or solute. The result is multiplied by 100 to give a percent. The formula for the quantum of an element in a emulsion is mass percent = (mass of element in 1 operative  of emulsion / mass of 1 operative of emulsion) *100.

An alloy, metallic substance comprised of two or more elements, as either a compound or a solution. For example: Brass is an alloy of two metals: copper and zinc.

According to question,

Mass of pure Gold = 64g

Mass of pure zinc = 32 g

Now,

Total weight of alloy is = 64 + 32 = 96 gram

32 g of which is zinc

So percentage (%) of zinc in the alloy is 32/96*100 =  33.33 %

Hence, the percentage of zinc in the alloy is 33.33%.

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20gm of hydrogen will have highest number of hydrogen atoms.

We know that 1 mole of substance contains atoms equal to Avogadro number i.e.  [tex]6.022*10^{23}[/tex]

As molar mass of hydrogen is 1gm there 1 mole of hydrogen contains 1gm of hydrogen and [tex]6.022*10^{23}[/tex] hydrogen atoms

If we take 1020 hydrogen atoms then it is very less than [tex]6.022*10^{23}[/tex] hydrogen atoms.

In 100gm of substance if hydrogen is 2% by mass i.e. we have 2gm of hydrogen atom  which means 2 mole of hydrogen atoms

Mass of 1 mole of water is 18gm

Thus 100 gm of water have 5.55 moles of water

In 1 mole of water we have 2 grams of hydrogen

Therefore 5.55 moles of water contains 11.11gm of water i.e. 11.11 mole of water

11.11gm of water = [tex]11.11* 6.022 * 10^{23}[/tex] atoms

In 20gm of hydrogen we have 20 mole of hydrogen

               i.e. [tex]20* 6.022 * 10^{23}[/tex]

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Answer:

Explanation:

To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.

3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g

8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g

1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g

The mass of fuel the airplane taken on is 1.81 × 10⁵ g or 1.81 × 10² kg.

V(fuel) = 221 l

V(fuel) = 221 l × 1000 ml/l

V(fuel) = 221 000 ml = 2.21 × 10⁵ ml; volume of the fuel

d(fuel) = 0.821 g/ml; density of the fuel

m(fuel) = V(fuel) × V(fuel)

m(fuel) = 2.21 × 10⁵ ml × 0.821 g/ml

m(fuel) = 1.81 × 10⁵ g; mass of the fuel

m(fuel) = 1.81 × 10⁵ g × 10⁻³ kg/g

m(fuel) = 1.81 × 10² kg

Density is a measure of mass per unit of volume (in this example grams per milliliter).

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Process in which co2, is released as a by-product of oxidation-reduction reactions is known as krebs cycle.

In the mitochondrial matrix, acetyl-CoA is converted to carbon dioxide by the citric acid cycle, which also involves the reduction of coenzymes to produce ATP for the electron transport chain.

The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.

Each glucose molecule produces two acetyl-CoA molecules so, the Krebs cycle must be completed twice to produce the four CO2, six NADH, two FADH2, and two ATPs.

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The conversion of each of the measurements given to the new unit stated using the factor label method is as follows:

1 Foot = 30.48 cm.

∴ 26 cm = 26/30.48 = 0.853 foot.

1lb = 453.59 g.

16 lb = 453.59 × 16 = 7257.48 g.

1 year = 365 days; 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 sec.

1 year = 365 × 24× 60× 60 = 31,536,000 seconds.

1 mile = 1.60 km.

3.5 mile = 3.5 × 1.60 = 5.63 km.

The factor label method may be defined as a type of technique that is significantly utilized in order to convert one unit of measurement into the other with the utilization of the conversion factor.

Therefore, the conversion of each of the measurements given to the new unit stated using the factor label method is well-described above.

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Mobile water supply operations, such as water shuttles or relay pumping, must be performed In rural areas without public water distribution systems

A distribution systems includes all of the centers and devices connecting a transmission device to the customer's device. A traditional distribution device can consist of: Substations. Distribution Feeder Circuits. Switches.

Distribution systems, additionally referred to as dispensed computing, is a device with more than one additive placed on extraordinary machines that speak and coordinate movements so that it will seem like an unmarried coherent device to the end-user.

A dispensed device is computing surrounding wherein diverse additives unfold throughout more than one computer (or different computing gadgets) on a network. These gadgets cut up the work, coordinating their efforts to finish the task extra effectively than if an unmarried tool were accountable for the task.

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The planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune (option B).

A scale model is a three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original.

In the solar system, there are nine planets. These nine planets in a decreasing order of their size (diameter) are as follows:

Based on the original diameters of the planets, it can be said that the planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune.

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Answer:

neptune

Explanation:

Hydrofluoric acid, HF in an aqueous form having molecular weight of 20.01 have concentration of 48-50% w/w in aqueous solution/water with a pH of 5.89.

HF in an aqueous solution ionizes like the other acids. It is extremely corrosive. It dissociates in water as -

                                        HF + H₂O ⇆ H₃O⁺ + F⁻  

Hydrofluoric acid is much stronger when concentrated. If concentration increases and approach to 100%, the acidity of acid increases and the base forms a bond.

                                        3HF ⇆ H₂F⁺ + HF₂⁻

The presence of hydrogen ion in an aqueous solution makes the HF acidic. HF is soluble with boiling point 19.5°C and melting point 0f -83.6°C

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Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, there would be no net movement of glucose

The given declaration is wrong. Glucose answers aren't electrolytes and consequently do now no longer behavior power. Is sodium chloride an awesome conductor of power? Simply with the aid of using dissolving or dissolving it in water, it can not behavior power as a solid.

Saline includes Na+ and Cl- ions. If ions are gifted withinside the answer, those ions can pass thru the answer and convey an electric-powered current. Pure water and sugar answers do now no longer include widespread ions. glucose molecules do now no longer smash down into ions whilst dissolved.

When glucose is introduced to water, it dissolves without difficulty however now no longer dissociates into ions. Therefore, a glucose answer isn't an electrolyte and isn't a conductor of power.

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Answer:

Carboxylic acid group

Explanation:

Carboxylic acid and amine groups form the basis of an amino acid.  One group reacts with the other group on a neighboring amino acid to form the peptide bond, with the release of a water molecule.

Answer:

1. there are 29,000 grams present in 29 kilograms

2. there are 2000 millimeters present in 2 meters.

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A lead ball added to a graduated cylinder containing 30.8 ml of water, causing the level of the water to increase to 89.9 ml, has a volume of 59.1 ml.

Volume is defined as the amount of space that matter occupies. There are three different ways to find the volume:

1) Volume by Space - by measuring its physical dimensions

2) Volume by Density and Mass - by dividing its weight by its density

3) Volume by Displacement - by measuring the volume displaced when immersed in a liquid or gas

To solve for the volume of the lead ball, we can use the displacement method by subtracting the initial volume from the final volume.

If the level of the water increased from 30.8 ml to 89.9 ml upon adding the lead ball, the displaced volume is:

volume = final volume - initial volume

volume = 89.9 - 30.8

volume = 59.1 ml

Hence, the volume of the lead ball, using displacement method, is 59.1 ml.

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Answer: 59.1 mL

Explanation: In order to find the volume of the lead ball, you will simply take the difference between the volume of the water before and after the ball was submerged.

Answer:

D. Some positive particles bounced back in the direction they came from

0.125 mg of cesium-137 would remain.

For calibrating radiation-detection tools like Geiger-Mueller counters, modest amounts of cs-137 are utilized. Cs-137 is employed in higher concentrations in medical radiation therapy equipment for the treatment of cancer, in industrial gauges that monitor liquid flow through pipelines, and in other industrial equipment to gauge the thickness of materials including paper, photographic film, and metal sheets.

In nuclear reactors and during the testing of nuclear weapons, one of the consequences of nuclear fission is cs-137. Due to nuclear reactor mishaps, such as the 1986 Chernobyl power plant accident, which spread Cs-137 to numerous European nations, and nuclear weapons testing that took place in the 1950s and 1960s, small amounts of Cs-137 can be discovered in the environment.

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Empirical formula for the hydrocarbon is C₅H₂

Moles of C=6.43CO2 x 1 mol CO₂/44 g x 1 mol C/mol CO₂=0.14 moles of C

Moles of H=2.19 H₂O x 1 mol H₂O/18 g x 2 mol H/mol H₂O=0.12moles of H

Dividing both by 0.14

1 mol C=0.8571mol H

Multiplying both by 3

5 mol C

2 mol H

Empirical formula =C₅H₂

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The density of water at room temperature is 1.0 g/ml.

Density is defined as the mass per unit volume. It gives the denseness of a given substance in a specific space. Different substances have different densities.

The formula to calculate the density is:

                                        ρ =m/v

where,

ρ is the density, m is the mass of the object and V is the volume of the object. The SI unit of density is kg/m³, but we use g/ml for our convenience.

For example, the density of water is 1000 kg/m3 but we convert it into 1.0 g/ml.

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The protons neutrons and electrons are there in a neutral atom

In a neutral atom of ⁶⁰Co (cobalt-60), there are 27 protons, 27 electrons, and 33 neutrons.

We have to find the number of protons, neutrons, and electrons in a neutral atom of ⁶⁰Co (cobalt-60).

The number of protons = The atomic number.

The atomic number of cobalt is = 27

Therefore, the protons are 27

As protons and electrons are equal. Then, the number of electrons is 27.

The number of Neutrons = Atomic number - Number of protons.

Neutrons = 60 - 27

Or, neutrons = 33

Hence, the number of neutrons is 33, electrons are 27, and protons are 27 in a neutral (cobalt-60).

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The molar absorptivity of the solute that absorbs 86% wavelength of light when the beam passes through a 1.0cm cell containing a 0.16M solution is 5.375 mol L⁻¹ cm⁻¹

According to Beer-Lambert law,

"The concentration of a solution may be determined by measuring its absorbance since there is a linear relationship between the concentration and the absorbance of the solution."

A = εbC ......(i)

Where A ⇒ Absorbance

ε ⇒  Molar absorptivity

b ⇒ Length of the light path

c ⇒ Concentration

Now, A = 86%

b = 1.0cm

C = 0.16M

From (i)

A = εbC

0.86 = ε × 1 × 0.16

0.86 = ε × 0.16

ε = [tex]\frac{0.86}{0.16}[/tex] mol L⁻¹ cm⁻¹

ε = 5.375 mol L⁻¹ cm⁻¹

Therefore, the molar absorptivity of the solute is 5.375 mol L⁻¹ cm⁻¹

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