Which letter(s) on the heating curve represents a change in kinetic energy? (Select all that apply.)

Select 3 correct answer(s)

D

E

A

B

C

Answer:

The answer is

21.5 L

.

So, start with the balanced chemical equation for the decomposition of hydrochloric acid

2

HCl

→

H

2

+

Cl

2

Notice that you have a

2:1

mole ratio between

HCl

and

Cl

2

, which means that every 2 moles of the former will produce 1 mole of the latter. The number of moles of

HCl

you have is.

Explanation:

I don't know if that is but I try my best just correct me if I'm wrong thank you!!

If the acetic acid being titrated here were replaced by hydrochloric acid, the amount of base needed will not change by changing the acid.

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Student 4 because a Bronsted-Lowry base always accepts a proton from an acid to form a conjugate acid.

Kb = 4x[tex]10^{-4}[/tex]

C 0.01

where C is concentration.

∵[OH-] = [tex]\sqrt{K.c}[/tex]

[oh-] = [tex]\sqrt{√4x10^{-4} D}[/tex]

= [tex]\sqrt{4*10^{-6} }[/tex] = [tex]\sqrt{2*10^{-3} }[/tex]

∴ H(+) = [tex]10^{-14} / 2*10^{-3} = 0.5*10^{-11}[/tex]

ph = - log ([tex]H^{+}[/tex])

= - log [tex](1/2*10^{-11})[/tex]

11 - log (1/2)

= 11 + 0.3010

= 11.3010

(~11-12).

In the Bronsted-Lowry definition of acids and bases, acids are proton H +  donors and bases are proton acceptors. A conjugate base is formed when a Bronsted-Lowry acid loses a proton. Similarly, when a Brønsted-Lowry base gains a proton, a conjugate acid is formed. When a Bronsted acid or just an acid reacts with a Bronsted base or just a base a proton is transferred from the acid to the base. This forms another acid called the conjugate acid and another base called the conjugate base.

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Answer:

The atomic number is the number of protons in the nucleus. The mass number is the total of protons and neutrons. The mass number is always larger than the atomic number.

Explanation:

FYI, when you mention -2, it means that there would be 2 extra electrons which make the element negatively charged. The atomic number and mass are not dependent on the number of electrons.

The classification of acids.

monoprotic acid - HBr ,

diprotic acid - H2SO4 , H2CO3,

triprotic acid - H3PO4.

A monoprotic acid is an acid that can donate the handiest one proton, while polyprotic acid can donate a couple of protons. in addition, a monoprotic base can best accept one proton, at the same time as a polyprotic base can receive multiple protons.

Any acid that consists of just one hydrogen atom in its method is monoprotic, however, a few acids that contain more than one hydrogen atom also are monoprotic. In different phrases, all unmarried-hydrogen acids are monoprotic however not all monoprotic acids comprise the handiest unmarried hydrogen.

A diprotic acid is an acid that yields two H+ ions consistent with acid molecule. Examples of diprotic acids are sulfuric acid, H2SO4, and carbonic acid, H2CO3.

A tricrotic acid is an acid that has 3 dissociable protons that go through stepwise ionization.

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The atomic radius of helium is 28 pm.

What is helium?

Helium is indeed an element in the periodic table with the atomic number 2 and the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first element in the periodic table's noble gas group. It has the lowest boiling and melting points of any element. It is the second most plentiful and second lightest element in the visible universe. Its abundance is comparable to that of the Sun and Jupiter due to helium-4's extremely high nuclear binding energy (per nucleon) in comparison to the next three elements after helium. This helium-4 binding energy is also responsible for its existence as a byproduct of both nuclear fusion and radioactive decay. Helium-4 is the most abundant element in the universe.

The atomic radius of helium is 28x10⁻¹² m.

The atomic radius of helium is 28x10⁻³ nm.

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Helium is an "Inert" gas .the atomic radius of helium in 3.1 × 10^-11 m and atomic radius of helium in7.559 × 10^-14nm.

The atom with the smallest radius is helium, as explained. The valence electrons are kept near to the nucleus because of the trends in the periodic table and the effective nuclear charge. Atomic radius decreases as you move up and down a group and left to right throughout a period.

The second most common element in the universe is helium, which is present everywhere. On Earth, though, it's considerably less typical. It must be extracted from natural gas wells and cannot be manufactured artificially.

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A separation method known as chemical extraction depends on the difference between an element's solubility in an organic solvent and an aqueous solution.

Water in liquid form serves as the solvent in an aqueous solution. In other words, the ions and molecules from the solvent (dissolved) are encircled by and incorporated into the network of connections that make up water particles. Then, the dissolved organisms dispersed throughout the water.

Water, that makes up around 70% of the mass of the human body and is necessary for life, serves as that of the solvent in aqueous solutions. The interaction of molecules of water with dissolved substances is crucial to many of the oxidation processes that maintain humans alive.

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The mass of NaCl is found to be 2.828g by indirect method and the % difference is (x – 2.828) / 2.828 x 100.

Mass is the amount of matter in a physical object.  It is a measure of the body's inertia, or resistance to acceleration whenever a net force is applied. The mass of an item also influences the intensity of its gravitational pull to other things. Mass is a dimensionless quantity that represents the amount of matter in a particle or object.

% difference is the variation in the values between the measured mass and the mass obtained by subtraction. The % difference refers to the difference between the observed mass and the mass obtained by subtraction divided by the mass by subtraction x 100.

Given:

Mass of mixture = 10g

Mass of ammonium chloride = 0.529g

Mass of sand = 6.643g

To find:

Mass of NaCl = ?

% difference = ?

Calculations:

By using the indirect method,

Mass of NaCl = Mass of mixture – (Mass of ammonium chloride + mass of sand)

Mass of NaCl = 10 – (0.529 – 6.643)

Mass of NaCl = 2.828g

% difference = (measured mass – mass by substraction) / mass by substraction x 100

Since we do not know the mass of empty dish,

% difference = (x – 2.828) / 2.828 x 100

Result:

The mass of NaCl is 2.828g and the % difference is (x – 2.828) / 2.828 x 100

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The bond angles of each of the bonds are;

A - 107 degrees

B- 104.5 degrees

C- 120 degrees

D - 109.5 degrees

E - 120 degrees

We define the bond angle as the angle that exists between two atoms that have been bonded together. We must note that the bond angle depends on the nature of the bond between the atoms as well as the kind of the atoms that are bonded.

It should be noted that the presence of lone pairs on any of the atoms that is involved in the bond would tend to decrease the bond able of the bond.

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Possibly Perkins' most well-known pupil was Helen Keller, while her teacher Anne Sullivan came as a close second. The movie "The Miracle Worker" made popular the tale of the young girl who was deafblind and eventually learnt to communicate after her teacher wrote the word "water" into her hand.

Helen Keller was a blind and deaf novelist and educator who was born in Tuscumbia, Alabama, on June 27, 1880, and died in Westport, Connecticut, on June 1, 1968. At the age of 19 months, Keller's disease robbed her of her sight and hearing, and her speech development soon followed.

The early years of Helen Keller, a young woman who become blind and deaf at a young age, are covered in the 1903 book The Story of My Life. The book examines the difficulties she encountered as a disabled child growing up and introduces the incredible people who supported her along the road.

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Answer:

Magnesium

Explanation:

To recognize what element this is, we can simply look at the last orbital (3s2) and go to the periodic table and see what element is in that final orbital.

We go to row 3 (because of the 3s orbital) and then we have 2 electrons in that orbital, meaning that our element in the configuration is Magnesium.

River water stored behind a dam is best described as a form of Potential Energy.

What is Potential energy?

Potential energy is refered to as energy that is stored – or conserved - in an object or substance. This stored energy is based on the position, arrangement or state of the object or substance. There are two types of potential energy namely:

The water or river behind a dam stores gravitational potential energy since it is at a higher level than the water on the other side of the dam.

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If the density of ocean water at a depth of 10,000 m is 1.071 g/ml and if 25.0 g of water at that depth contains an additional 190 mg of KCl,  the molarity of KCl will be 0.109M.

Given data:

Depth= 10000m

Density= 1.071 g/ml

M (water)= 25g

M (KCl) = 190mg

Volume can be determined by using the formula:

Volume= Mass/Density

= 25/1.071 = 23.34ml

It is known that:

No of moles= Mass/ Molar Mass

Molar Mass of KCl= 74.5 g/mol

Now, put the value of mass and molar mass in above formula:

n =  0.190/74.5

  = 0.002550 moles

Molarity of KCl= no of moles/volume(L)

= 0.002550/23.34* 10⁻³

= 0.109 M

Therefore, the molarity of KCl will be 0.109 M.

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Based on the solubility of all the possible cation and anion combinations, the precipitate will be iron(II) carbonate. Based on its molar mass, 11.6 g of it will precipitate.

Generally, all the potassium salts and all the sodium salts (with the exception of sodium bicarbonate) are water soluble, so the precipitate must be the iron(II) salt. Iron(II) bromide is water soluble, but iron(II) carbonate isn't (only ammonium carbonate and alkaline carbonates display high solubility), so that's going to be precipitate.

We have 0.100 L * 1.5 M = 0.15 mol of carbonate ions and 0.100 L * 1.0 M = 0.1 mol of iron(II) ions, so because they react in a 1:1 ratio, we have an excess of carbonate ions and 0.1 mol of iron(II) will precipitate. Now we calculate the mass of the precipitate based on its molar mass:

M = (56 + 12 + 3 * 16) g/mol = 116 g/mol

n = m/M ⇒ m = n*M = 0.1 mol * 116 g/mol = 11.6 g

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The number of moles of CO₂ that can be made from the reaction is 2.5 moles

We'll begin by obtaining the limiting reactant for the reacion. This is given below:

CH₄ + 2O₂ —> CO₂ + 2H₂O

1 mole of CH₄ reacted with 2 moles of O₂

Therefore,

2.8 moles of CH₄ will react with = 2.8 × 2 = 5.6 moles of O₂

From the above, we can see that a higher amount of O₂ is needed to react with 2.8 moles of CH₄. Thus, O₂ is the limiting reactant.

We can determine the moles of CO₂ produced as follow:

From the balanced equation above,

2 moles of O₂ reacted to produce 1 mole of CO₂

Therefore,

5 moles of O₂ will react to produce = 5 / 2 = 2.5 moles of CO₂

Thus, the number of moles of CO₂ produced is 2.5 moles

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The charge on the atoms of the elements when they gain or lose electrons to have 8 valence electrons is:

Valence electrons are the electrons found in the outermost electron shells of an atom.
According to the octet rule, atoms will gain or lose electrons to achieve a stable octet configuration.

Considering the given elements:

Hydrogen will lose one electron to become H⁺

Beryllium will lose two electrons to become Be²⁺

Boron will lose three electrons to become B³⁺

Carbon will gain four electrons to become C⁴⁻

Nitrogen will gain three electrons to become N³⁻

Oxygen will gain two electrons to become O²⁻

Fluorine will gain one electron to become F⁻

Neon will neither gain nor lose electrons as it is stable as Ne⁰.

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Depending on how the changed amino acid performs in the body. A protein's ability to function may be completely lost if another amino acid is substituted, where as substituting one may have no discernible impact.

The fundamental molecule used to create proteins is known as an amino acid. Twenty distinct amino acids are available. A gene encodes the sequence of one or more chains of amino acids (known as polypeptides) that make up a protein. While some amino acids (called essential amino acids) can be produced by the body, others (called non-essential amino acids) cannot and must be received through diet. In marketing for food products, the phrase "amino acid" has crept into everyday speech. Some foods, like eggs or quinoa, have been listed as having "large levels of amino acids." And from this point on, you will recognize those labels as referring to a crucial protein component that is functional rather than static.

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Answer:

Explanation: it was said that work is done upon an object whenever a force acts upon it to cause it to be displaced. Work involves a force acting upon an object to cause a displacement. In all instances in which work is done, there is an object that supplies the force in order to do the work. If a World Civilization book is lifted to the top shelf of a student locker, then the student supplies the force to do the work on the book. If a plow is displaced across a field, then some form of farm equipment (usually a tractor or a horse) supplies the force to do the work on the plow. If a pitcher winds up and accelerates a baseball towards home plate, then the pitcher supplies the force to do the work on the baseball.

This question's correct answer is 1.395 atm. It will exert 1.395 atm of pressure in atmospheres if transferred to a 1.425 litre vessel with a temperature of 25.2 C.

Boyle's Law: The relationship between Pressure and Volume, The volume of a gas decreases as the pressure on it increases because the gas particles are forced closer together. In contrast, as a gas's pressure decreases, its volume increases because the gas particles can now move farther apart.

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Frequency for red is  [tex]4.61\times 10^{14} s^{-1}[/tex].

wavelength for orange is  [tex]590\times 10^{-9} m[/tex] .

wavelength for green is [tex]510\times10^{-9} m[/tex].

frequency for blue is  [tex]6.31\times 10^{14} s^{-1}[/tex].

frequency for indigo is  [tex]6.74\times 10^{14} s^{-1}[/tex].

wavelength for violet is [tex]4\times 10^{-9}/m[/tex].

For red :  [tex]c = 3.00 x 10^{8} m/s[/tex]

               λ = [tex]650\times 10^{-9}[/tex]

              f = c/ λ

              f =  [tex]\frac{3.00\times 10^{8} }{650\times10^{-9} }[/tex]

             f = [tex]4.61\times 10^{14} s^{-1}[/tex]

For orange : [tex]c = 3.00 x 10^{8} m/s[/tex]

                     f = [tex]5..08\times 10^{14}/s[/tex]

                     λ =  [tex]\frac{c}{f}[/tex]

                    λ  = [tex]\frac{3.00\times 10^{8} }{5.08\times10^{14} }[/tex]

                    λ = [tex]590\times 10^{-9} m[/tex]

For green :  [tex]c = 3.00 x 10^{8} m/s[/tex]

                   λ =   [tex]5..88\times 10^{14}/s[/tex]

                   λ =  [tex]\frac{3.00\times 10^{8} }{5.88\times10^{14} }[/tex]

                   λ = [tex]510\times10^{-9} m[/tex]

For blue : [tex]c = 3.00 x 10^{8} m/s[/tex]

                 λ = [tex]475\times 10^{-9}/m[/tex]

                f = c/ λ

                f = [tex]\frac{3.00\times 10^{8} }{475\times10^{-9} }[/tex]

                f = [tex]6.31\times 10^{14} s^{-1}[/tex]

For indigo :  [tex]c = 3.00 x 10^{8} m/s[/tex]

                    λ = [tex]445\times 10^{-9}/m[/tex]

                      f = c/ λ

                      f = [tex]\frac{3.00\times 10^{8} }{445\times10^{-9} }[/tex]

                     f = [tex]6.74\times 10^{14} s^{-1}[/tex]

For violet : [tex]c = 3.00 x 10^{8} m/s[/tex]

                   f = [tex]750\times 10^{14} s^{-1}[/tex]

                   λ =  [tex]\frac{c}{f}[/tex]

                  λ = [tex]\frac{3.00\times 10^{8} }{750\times10^{14} }[/tex]

                  λ =  [tex]4\times 10^{-9}/m[/tex]

Wavelength can be defined as the distance between the crests or troughs of two successive waves. It is measured in the direction of the wave.

Wavelength is the distance  of a wave (which can be an electromagnetic wave, a sound wave or any other wave) from one crest to another or from one base to another. A crest is the highest point of a wave, while a trough is the lowest. Since wavelength is a distance/length, it is measured in units of length such as meters, centimetres, millimetres, nanometres, etc.

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The table showing composition of four atoms has different number of protons, electrons, and neutrons. On the basis of the information given in the table, Mystery atom 1! 15! 15! 15! and the mystery atom 2! 17! 16! 15!  are of the same element because they have same number of neutrons.

Atoms do not always contain same number of electrons and protons, but the number of neutrons in an atom is always same unless there is possibility of an isotope.

When number of electrons and protons is same in an atom, it do not carry charge and is called as a neutral atom. When number of electrons is more, atom carries a negative charge and when number of protons is more, the atom carries a positive charge.

Electrons have negative charge, protons have a positive and neutrons do not carry any charge. As opposite charges attract, electrons and protons attract each other. Addition or removal of neutrons from the nucleus does not bring the change in the electrical charge of the nucleus.

In atom 1 and 2, number of neutrons is same and electrons are more in atom 2. Therefore, it carries negative charge and it is a charged atom of same element as atom 1.

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The volume of the air occupied in the tank at 742 torr is found to be 1147.54L by using Boyle’s law.

Boyle's law is an experimental gas law that specifies how the pressure of a gas decreases as the volume or capacity of the container increases.

According to Boyle’s law, if the temperature and quantity of gas stay constant within a closed system, the absolute pressure applied by a given mass of an ideal gas is inversely related to the volume it fills.

Given:

V1 = 8L

P1 = 1.4 x [tex]10^2[/tex] = 140atm

P2 = 742 torr = 0.976atm

To find:

V2 = ?

Formula:

P1V1 = P2V2

Calculations:

V2 = P1V1 / P2

V2 = 140 x 8 / 0.976

V2 = 1147.54L

Result:

The volume of the air occupied in the tank at 742 torr is found to be 1147.54L

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Answer:

The Model T’s substance changed phase because the attraction of the molecules was able to overcome their slower movement. Its molecules now move in place.

The trend which depicts the reactivity of most nonmetals show in a periodic table, excluding the noble gases is that increases from left to right across the periodic table and is denoted as option C.

This is referred to as the tabular arrangement of elements into groups and periods according to their similar features such as reactivity, conductivity, valence electrons etc.

In the table, the reactivity of most nonmetals such as nitrogen decreases top down within groups and increases from left to right across period which is therefore the reason why it was chosen as the most appropriate choice.

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Answer:

its B! :)

Explanation:

c was not true ❕

The volume of the nitrous oxide gas is 1729.3 Liters

The number of moles of gas present in 3.40 kg of nitrous oxide is determined from the formula below:

Numbers of moles = mass/molar mass

the mass of nitrous oxide = 3.40 kg or 3400 g

the molar mass of nitrous oxide = 44.013 g/mol

Moles of gas = 3400 / 44.013

Moles of gas = 77.25 moles

Using the ideal gas equation to determine the volume of the gas:

PV= nRT

V = nRT/P

where;

V = 77.25 * 0.082 * 273 / 1

The volume of the gas = 1729.3 Liters

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Answer:

it's A

Explanation:

Synthetic polymers are lightweight

The loss of the sixth e- will be followed by the biggest ionization jump. Because you are now attempting to remove the 2s2 electrons from a full valence shell, the 7th IE has the largest number.

The amount of energy needed to remove an electron from an isolated atom or molecule is known as ionization energy, also known as ionization potential, in chemistry and physics. The first (most loosely held) electron's associated ionization energy is the one that is most frequently used, though there is an ionization energy for each subsequent electron removed.

An electric discharge tube is typically used to measure the ionization  energy of chemical elements, which is expressed in joules or electron volts. In this device, a fast-moving electron produced by an electric current collides with an element's gaseous atom, causing it to eject one of its electrons.

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The no. of moles present in 955.7g of Topaz is found to be 4.30 moles.

The no. of moles of a material equals the ratio of its given mass to the mass of one mole of that material in a chemical reaction.

We can calculate the no. of moles of a chemical whose mass is known. To calculate the amount of moles in a sample, just weigh it and divide the mass by the molecular mass. The quotient obtained in this case is equal to the no. of moles.

Topaz is an aluminum and fluorine silicate mineral that is used in jewellery as a gemstone and in other adornments. Topaz is colourless in its normal condition, but trace element impurities can turn it light blue, golden brown, or yellow orange.

Given:

Mass = 955.7g

Chemical formula of Topaz = [tex]Al_2SiO_4F_4[/tex]

To find:

No. of moles = ?

Formula:

No. of moles = Mass / Molar mass

Calculations:

Molar mass = (2 x 26.98) + 28.08 + (4 x 16) + (4 x 18.99)

Molar mass = 222g/mol

No. of moles = 955.7 / 222

No. of moles = 4.30 moles

Result:

4.30 moles is present in 955.7g of Topaz.

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If one electron is removed from sodium during a reaction energy level becomes the valence shell is outermost shell

Electrons are the smallest of the particles that make up an atom, and they carry a negative charge a neutral sodium atom is likely to achieve an octet in its outermost shell by loosing its one valence electron the cation produce in this way is Na⁺ is called as sodium ion distinguish it from element and the outermost shell of sodium ion is the second electron shell which has eight electrons in it

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