1. How much taller is the average person today than the average person 100 years ago?

A. 1 inch

B. 2 inches

C. 5 inches

D. 10 inches​

Answer: The mass number of X is 218.

Explanation:

Alpha decay : When a larger nuclei decays into smaller nuclei by releasing alpha particle. In this process, the mass number and atomic number is reduced by 4 and 2 units respectively.

General representation of an element is given as:   \(_Z^A\textrm{X}\)

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

General representation of alpha decay :

\(_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha\)

\(_{86}^{222}\textrm{Rn}\rightarrow _{84}^{218}\textrm{Po}+_2^4\textrm{He}\)

Answer:

chemical energy is your correct answer mark me brainly

The correct answer is C. -0.76 V. the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

The correct answer is C. -0.76 V.

The standard reduction potential, denoted as E°, is a measure of the tendency of a species to gain electrons and undergo reduction in a redox reaction. It is expressed in volts (V) and represents the potential difference between the reduction half-reaction and the standard hydrogen electrode (SHE), which is assigned a potential of 0 V.

In the given half-reaction:

Mg2+(aq) + 2e- → Mg(s)

The species undergoing reduction is Mg2+(aq), and it is being reduced to Mg(s) by gaining 2 electrons.

To find the standard reduction potential for this half-reaction, we can refer to standard reduction potential tables. These tables provide a reference for various half-reactions with respect to the standard hydrogen electrode.

In the table, the standard reduction potential for the Mg2+(aq) + 2e- → Mg(s) half-reaction is listed as -0.76 V. This means that Mg2+ has a tendency to be reduced, and the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

Therefore, the correct answer is C. -0.76 V.

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Answer: B. The actual mechanical advantage of the ramp.

Explanation:

The professor saying that the ramp SHOULD have a mechanical advantage of 3 indicates that that would be the ideal mechanical advantage. Since Rubia calculated it to be 2.8, that means that it is the acutal mechanical advantage. The actual advantage will be reduced from the ieal due to things like friction.

Answer:

A)strong and concentrated

Explanation:

I think. I haven't done chemistry since high school!

Answer:

Hello! Your answer would be (A)

Explanation: Hope this helped you out!

The nitrate ion's atoms are bonded together in the molecule potassium nitrate (KNO3) by covalent bonding, and the potassium ion and nitrate ion are held together by ionic bonding.

What is covalent bond?

A chemical bond in which atoms share electron pairs is known as a covalent bond, sometimes known as a molecular bond. Bonding pairs/ sharing pairs are the names given to these electron pairs. Between two non-metals, a covalent bond develops.

When one atom transfers one or more electrons to another atom, an ionic bond is created. It is the total transfer of valence electron(s) between atoms with diametrically opposed charges.

According to the given question:

Since both the nitrogen (N) and the oxygen (O) atoms in nitrate ions are non-metals and share electron pairs, the bonding in nitrate ions is covalent.

In potassium nitrate, the valence electron is completely transferred between the oppositely charged atoms (K+) and the nitrate ion, which is a non-metal. Ionic bonding is therefore what holds potassium and nitrate together.

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The final concentration of \(Cu^{2+}\) in the solution is 1 × \(10^{-16} M\).

Given:

Concentration of \(Cu(NO_{3} )_{2}\) = 4.00 × \(10^{-4} M\)

rmen = 1.00 × \(10^{-3}M\)

Moles of \(Cu(NO_{3}) _{2}\) = 0.0004 mol

Moles of ethlenediamine = 0.001 mol

Kf for \(Cu(en)^{2+} _{2}\) = 1 ×\(10^{20}\)

From the fromula \(Cu(en)^{2+} _{2}\):

The mole ratio for \(Cu(NO_{3})_{2} : en = 2:1\)

so, moles of en = 0.0004 × 2 = 0.0008 moles

Now, remaining en moles = 0.001 - 0.0008 = 0.0002 moles

Now, using the formula \(Cu(en)^{2+} _{2}\):

0.0004 moles of \(Cu(NO_{3})_{2}\) reacted to form an equal 0.0004 moles of \(Cu(en)^{2+}_{2}\) as shown by equation below:

\(Cu^{2+} + 2en\) → \(Cu(en)^{2+} _{2}\)

1.0 ×\(10^{20}\) = \(\frac{0.0004}{(Cu^{2+) * (0.0002^{2+} )} }\)

Kf = \(\frac{Cu(en)^{2} _{2} }{(Cu^{2+}) (en^{2}) }\)

\(Cu^{2+} = \frac{0.0004}{(1.0 * 10^{20} * 4 * 10^{-7}) }\)

\(Cu^{2+} = 1 * 10^{-16} M\)

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

Molarity is the sum of the solute's moles. litres of the solution. Since the volume of the solution will be measured in litres and the quantity of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

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The complete question is:

A 1. 00-L solution contains 4. 00*10-4 M Cu(NO3)2 and 1. 00×10-7 Methylenediamine (en). The Kf for Cu(en)22 is 1. 00 x 1020. What is the final concentration of Cu2+ in the solution?

Answer:

Explanation:

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To "fix" hydrogen means to convert it from its gaseous form (H₂) into a chemically usable form or compound.

Fritz Haber's method for fixing hydrogen, known as the Haber-Bosch process, involves combining hydrogen (H₂) with nitrogen (N₂) from the air to produce ammonia (NH₃) through a catalytic reaction. This ammonia can then be used to produce fertilizers, explosives, and other important chemicals.

Fritz Haber's method is considered the most important invention of the twentieth century because it revolutionized agriculture and food production. The production of ammonia-based fertilizers made it possible to significantly increase crop yields, addressing global food shortages and supporting a growing population.

This process had a profound impact on global agriculture and played a crucial role in the Green Revolution, which helped alleviate hunger and improved living standards worldwide.

Additionally, the Haber-Bosch process also enabled the production of synthetic materials, such as plastics and fibers, that have transformed various industries and contributed to technological advancements.

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Answer:

c. alcohol

Explanation:

Alcohol is -OH

Ether is -OR

Ester is O=C-OR

Aldehyde is O=C-H

- Only alcohol fits

Alcohol is the type of organic compound is represented by the structural formula.

This can be defined as the type of organic compound that carries at least one hydroxyl functional group (−OH) bound to a saturated carbon atom.

The hydroxyl group(OH) is attached to a Carbon atom in the diagram which depicts features of an Alcohol.

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Answer:

The answer is A

Explanation:

Answer:I think its C hope this helps

Explanation:

The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.

Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

Therefore,  the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

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The pressure exerted by the water vapor molecules in the air is called the vapor pressure.

The Vapor pressure is the measure of the tendency of the material to change in to the gaseous state or the vapor state, and it will increases with the temperature. The temperature at which the vapor pressure of the surface of the liquid will becomes equal to the pressure that is exerted by the surroundings is called as the boiling point of the liquid.

The pressure exerted by the vapor in the thermodynamic equilibrium with the its condensed phases at the given temperature in the  closed system is termed as the vapor pressure.

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Answer: The respiratory system

Explanation: It includes the nose, mouth, throat, voice box, windpipe, and lungs. Air enters the respiratory system through the nose or the mouth.

Answer:

The rock in a bucket of water analogy is used to describe how air masses interact. When a warm air mass is placed over a cold air mass, it is like a rock being placed in a bucket of water. The warm air mass will initially rise, creating an area of low pressure. The cold air mass will then rush in to fill the area of low pressure, creating a storm. This type of weather causes thunderstorms, heavy rains, and high winds.

In the second energy level, the highest energy subshell is 2p. The subshells are shown by the orbital quantum numbers.

There are four sets of quantum numbers that describe an electron in an atom which are;

The values of the orbital quantum number which shows the energy subshell in which an electron is found must take on values from 0 to (n - 1).

Having said that, for an atom with more than one electron, the highest energy subshell in the second energy level corresponds to l =1 which is the 2p orbital. Remember that s p d f corresponds to 0 1 2 3 .

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It is not possible for two electrons to have the same set of all four quantum numbers in an atom, as it would violate the Pauli exclusion principle.

According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. The four quantum numbers used to describe an electron's state are the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

The principal quantum number (n) determines the energy level of an electron and can have integer values starting from 1. The azimuthal quantum number (l) determines the shape of the electron's orbital and can have values from 0 to (n-1). The magnetic quantum number (m) determines the orientation of the orbital and can range from -l to +l. The spin quantum number (s) describes the spin of the electron and can have two possible values, +1/2 or -1/2.

Since each electron in an atom must occupy a unique set of quantum numbers, they must differ in at least one of the four quantum numbers. This ensures that no two electrons have the exact same quantum state.

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Answer:

because the two are opposite compounds.

Explanation:

When Chlorine is passed through aqueous sodium fluorine then no reaction takes place between these two because of reactivity order of Fluorine and Chlorine

Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength.

The reason for such reactivity is that as we go down the group the number of shells increases so outermost shell is very far away from the nucleus. If any atom from outside coming to this nucleus then this nucleus is unable to attract the electron of that that atom. Reactivity of halogens is directly proportional to the electronegativity power of that element, that is power to attract electron. Reactivity of halogens decreases down the group.

So Chlorine is less reactive than Fluorine so Chlorine can not replace Fluorine from sodium fluoride. Hence no reaction will take place.

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Among the given options, the substances that dissolve in water to yield hydronium ions are HBr, HNO3, and HI. Option B , C  and D

Hydronium ions (\(H_3O\)+) are formed when an acid donates a proton (H+) to water. This process, known as hydration or ionization, results in the formation of the hydronium ion. Let's examine each option:

NaCl (sodium chloride): NaCl is a salt composed of sodium ions (Na+) and chloride ions (Cl-). When NaCl dissolves in water, it dissociates into Na+ and Cl- ions. While the presence of water allows for the formation of hydrated Na+ ions, it does not yield hydronium ions. Therefore, NaCl does not produce hydronium ions.

HBr (hydrobromic acid): HBr is an acid that dissociates in water to yield H+ and Br- ions. The H+ ions react with water molecules to form hydronium ions (\(H_3O\)+). Thus, HBr dissolves in water to yield hydronium ions.

HNO3 (nitric acid): \(HNO_3\)is a strong acid that ionizes completely in water. It dissociates into H+ and NO3- ions. The H+ ions combine with water molecules to form hydronium ions. Therefore, \(HNO_3\)produces hydronium ions when dissolved in water.

HI (hydroiodic acid): HI is another strong acid that ionizes completely in water. It dissociates into H+ and I- ions. The H+ ions interact with water molecules, leading to the formation of hydronium ions. Thus, HI produces hydronium ions when dissolved in water.

Option B, C and D

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When the reaction is balanced, the balanced equation is: Cr₂O₇²⁻(aq) + 6Sn²⁺(aq) + 14H⁺(aq) → 2Cr³⁺(aq) + 6Sn⁴⁺(aq) + 7H₂O(ℓ). The coefficient of Sn²⁺(aq) is 6.

A coefficient is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. For example, two molecules of hydrogen would be written as 2 H2, and two molecules of water would be written 2 H2O. A coefficient is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. For example, two molecules of hydrogen would be written as 2 H2, and two molecules of water would be written as 2 H2O.

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Answer:

101.98 L

Explanation:

Ideal Gas Law    PV = n R T          R = gas constant = .082057 L-atm/mol-K

6.35 (V) = 4 * .082057 * 1973  

  V = 101.98 L

Answer: 19.4

Explanation: Acellus

Answer:

Growing a sunflower that is 10 feet tall is very impressive.

Explanation:

Hope it helps

Functional group can be interconverted into each ther by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound.

A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry.

a. A skeletal chain goes up, down, up, down to C double bonded to O, up to O H is Carboxylic group COOH.

b. A skeletal chain goes up to O, down, up, down, up. A hexagonal ring is single bonded to C l on one corner. this belongs to cyclic substituted compound.

c. N has a pair of electron dots above, and is single bonded to R Superscript 1, wedge bonded to H, and wavy bonded to H. This belongs to primary amine compound.

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Answer:

Coloroplasts I hope it's right ❤️

the mass defect of Li-7 is -0.035279 u and the nuclear binding energy per nucleon is 5.60553 × 10⁻¹² J/nuclide.

Given data:

Atomic mass of Li-7, A = 7.016003

The atomic mass of Li-7 is the sum of the number of protons and neutrons in it. Therefore, the number of neutrons in Li-7 is:

Neutrons = Atomic mass - Protons= 7.016003 - 3= 4.016003The mass of 3 protons and 4.016003 neutrons in Li-7 is: Mass of protons + Mass of neutrons = (3 x 1.007276) + (4.016003 x 1.008665) = 3.021828 + 4.029454 = 7.051282 u

Therefore, the mass defect in Li-7 is:

Mass defect = Actual mass - Calculated mass

= Atomic mass - Mass of protons and neutrons

= 7.016003 - 7.051282

= -0.035279 u

Nuclear Binding Energy per nucleon (BE/A) can be calculated using the formula:

BE/A = [Δm.c² / A]

where Δm is the mass defect and c is the speed of light which is 2.998 × 10⁸ m/s.

Substituting the values in the above formula:

BE/A = [(-0.035279) × (2.998 × 10⁸)² / 7]= 5.60553 × 10⁻¹² J/nuclide

Therefore, the mass defect of Li-7 is -0.035279 u and the nuclear binding energy per nucleon is 5.60553 × 10⁻¹² J/nuclide.

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