Help I am not sure how to do this number 8

In a solution, when we have an acid being dissociated, what is actually happening is that the acid is being pulled apart by solvent molecules, becoming two ions, the proton H+ and the conjugated base, this is what causes the solution to be acidic, and this is also how the strength of the acid is measured. Therefore the best answer is letter D

the heat energy required to take it to the melting point is 420J.

The heat capacity, abbreviated Cp, is the amount of heat needed to elevate a mole of a substance's heat content by precisely one degree Celsius.

A material has more thermal energy the hotter it is, says basic thermodynamics. Additionally, when a chemical is present in greater concentrations at a particular temperature, it will have a higher total thermal energy.

Mathematically,

Q = mc∆T

Where,

Q = quantity of heat absorbed by a body

m = mass of the body

∆t = Rise in temperature

C = Specific heat capacity of a substance depends on the nature of the material of the substance.

S.I unit of specific heat is J kg-1 K-1.

Given,

An ice cube of mass = m=25g

initial temperature = T1 = -8°C

final temperature = T2 = 0°C

Heat capacity for solid water = c = 2.1J/g°C

According to heat energy required to take it to the melting point,

Q = mc∆T

Q = 25g×2.1J/g°C × (0+8) °C

Q = (25×2.1×8) J

Q = 420J

Hence, the heat energy required to take it to the melting point is 420J.

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The empirical formula corresponds to the simplest form of expressing a compound, it indicates the proportion of atoms in the molecule.

We have two elements S and F and they give us the mass resulting from the decomposition of the molecule. We can find the moles of each element using the atomic weight of each element as follows:

To find the ratio between the elements we divide the moles of each element by the smallest number of moles found, that is by 0.028 moles.

Therefore the empirical formula of the compound will be:

ANSWER

Energy is created ------ (option C)

EXPLANATION

During the chemical reaction process, reactants need to be converted to form products. To balance such chemical reaction equation, we need to apply the law of conservation of mass

Law of conservation of mass states that matter can neither be created nor destroyed but can be transformed from one form to another.

In the process ofa chemical reaction, bonds are broken are the reactants side, bonds are formed on the products side and mass is conserved

Therefore, the correct answer is Energy is created

Answer:

Explanations:

Given the following parameters

Moles of sulfuric acid = 14 moles

According to the Avogadro's constant;

The number of molecules of 14 moles of sulfuric acid is calculated as:

Hence the molecule of sulfuric acid that is contained in 14moles if sulfuric acid is 2.408 * 10^24 molecules

Since the chemical formula of sulfuric acid is expressed as H₂SO₄. This shows that the compound has 2 atoms of Hydrogen, 1 atom of sulfur, and 4 atoms of oxygen.

Hence the number of atoms of oxygen contained in this sample is 4 atoms

when a bunsen burner is properly adjusted, the flame looks Blue with no gap between the burner and the flame.

A Bunsen burner is a particular kind of gas burner that is frequently utilized as a heat source in lab investigations. The barrel or chimney of the burner is made up of a straight tube that extends vertically from a flat base. At the bottom of the chimney, liquid petroleum gas, such as propane or butane, or natural gas, primarily methane, is delivered.

The base of the chimney on Bunsen burners typically has a hose barb installed so that rubber tubing may supply the gas from a gas nozzle on the lab bench.

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Thermal energy is transferred from a hot body (higher temperature) to a colder body (lower temperature). In these energy exchanges, two types of changes are observed: temperature or physical state. These variations occur both with energy intake and loss. What is being transferred between the two bodies is heat.

Answer: A. Heat.

The pH of the resulting solution  is 10.9 .

given that :

for HClO₄

volume = 25 mL = 0.025 L

M = 0.30 M

no. of moles = 0.025 × 0.30

                     = 0.0075

for CH₃NH₂

no. of moles = 0.35 × 0.06

                    = 0.021

as a resultant no. of moles of CH₃NH₂ that remain in solution

= 0.021-0.0075

= 0.0135

total volume = 0.025 + 0.060

                     = 0.085

the concentration will be :

concentration for HClO₄ = 0.0075 / 0.085

                                         = 0.088 M

concentration for  CH₃NH₂ = 0.0135 / 0.088

                                             = 0.153

kb = 4.4 × 10⁻⁴

pkb = - log kb

pkb = 3.3

the pOH formula is given as :

POH = pKb + log [ acid ] / [ base ]

pOH = 3.3 + log [ 0.088 ] / [ 0.153 ]

pOH = 3.06

pH + pOH = 14

pH = 14 - 3.06

pH = 10.9

Thus, The pH of the resulting solution when 25.0mL of 0.30M HClO₄ is added to 60.0ml of 0.35 M CH₃NH₂. Kb forCH₃NH₂ = 4.4 × 10^-4 . pH is 10.9.

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According to molar concentration,concentration in molarity  of the solution is 3.77×10[tex]^-7[/tex] M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

In the given problem,mass of benzene =2.91 g  and molar mass of benzene=78.11 g/mole and volume=100-2.91=97.09 ml or 97.09×10[tex]^-3[/tex] L.

Substituting in the formula,molarity=2.91/78.11×1/97.09×10[tex]^-3[/tex]=3.77×10[tex]^-7[/tex] M.

Hence, the molarity of solution is 3.77×10[tex]^-7[/tex] M.

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Answer

Procedure

Considering the following balanced equation.

2CH₃OH + 3O₂ ---> 2CO₂ + 4H₂O

To determine the grams of CO₂ that will be produced, you will first need to get the grams of water produced, then convert the grams of water into moles of water and use the molar proportios to get the moles of CO₂. Lastly, convert the moles of CO₂ into grams.

Additional data:

Dnsity of water = 1 g H₂O=/ of H₂O

CO₂ molar mass = 44.01 g/mol

H₂O molar mass = 18.02 g/mol

Calculations

Convert to mass

Convert to moles

Convert to moles of CO₂ using the relationship

Convert to grams of CO₂

Answer

4Na + O₂ → 2Na₂O

Explanation

Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation:

4Na + O₂ → 2Na₂O.

Hence, the balanced chemical equation for the reaction of sodium and oxygen is:

4Na + O2 to 2Na2O

The balanced equation of the reaction of the metal hydride, KH, and water is given below:

Metal hydrides are compounds that are composed of a reactive metal chemically combined with hydrogen.

The hydrogen atom is less electropositive than the metal and will accept electrons from the metal to form the negative hydride ion.

For example, Group 1A metal hydrides react with water to produce hydroxides and hydrogen gas.

Considering the above property, the given reaction will be:

KH (s) + H₂O(l) ---> KOH + H₂ (g)

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Answer

The moles of water that will be produced = 0.343 mol

Explanation

Given:

Mass of Ca(OH)2 = 29.0 g

Mass of HCl = 12.5 g

We know the reaction : Ca(OH)2 + 2HCI —> CaCI2 + 2H2O

Molar mass of Ca(OH)2 = 74.093 g/mol

Molar mass of HCl = 36.458 g/mol

Molar mass of H2O = 18.015 g/mol

Required: Moles of water that will be formed

Solution:

Use the stoichiometry to find the moles of water using both the reactants.

For Ca(OH)2:

For HCl

HCl will produce less moles of H2O, thus HCl is the limiting reactant/reagent and the moles of water that will be produced = 0.343 mol

to solve this we need to use the ideal gas law:

we need to calculate the number of mols of O2

Now we just have to solve for volume and use the number of mols just calculated and the standard pressure (1 atm) and temperature 273.15K:

Answer:

ammonia

Explanation:

Temperature is a way to measure the kinetic energy of the molecules of gases. The kinetic energy is a kind of energy that a moving body has. it is related to the mass of the body and the speed they are moving. The kinetic energy can be calculated as:

Where Ek is the kinetic energy, m is mass of the molecules and v is the speed of the molecule

Knowing that gasses with the same temperature have same kinetic energy, then gasses with larger mass will move slower and viceversa.

Since the molar mass of those gases are:

He: 4.00 g/mol

SF6: 146.06 g/mol

SO2: 64.066 g/mol and

Ar: 39.948 g/mol

the ligther gasses move faster and the hevier slower, so we just have to order them by increasing mass:

He, Ar, SO2 and SF6

Lithium nitride is an ionic compound and the chemical formula of lithium nitride is Li₃N and the charges on the ions is Li⁺¹N³⁻ 3 valence electron in lithium and 5 valence electron in nitrogen

Ionic compound is the ion compound these ions are atom that gain or lose electron resulting in a net positive and negative charges and lithium nitride is an ionic compound and in that Li⁺¹N³⁻ is the ion and the arrangement of the valency (outer shell) electrons are 3 valence electron in lithium and 5 valence electron in nitrogen

X = 3 electron

O = 7 electron

And that's why lithium nitride has 10 electron

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Usually, scientists will collide a large isotope such as Uranium-235 with a neutron. The collision results in several more nuclear fissions, also known as a chain reaction. This results in a HUGE release of energy!

Nuclear fission is a type of nuclear reaction in which a large isotope such as uranium-235b is split into two or more smaller isotopes with the release of large quantities of energy and radiation.

The process of nuclear fission in large isotopes can be initiated by colliding or bombarding these large isotopes with fast-moving neutrons which splits the nucleus of the atom, releasing energy ad more neutrons that will split more atoms of the large isotope, resulting in a chain reaction.

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The number of moles of nitrogen required to fill the airbag is 1.197 moles.

The mass of sodium azide required to decompose and produce 1.197 moles of nitrogen is 51.87 g.

If the mass used was greater, the airbag could burst, but if the mass used was smaller, the airbag would not inflate properly.

The number of moles of nitrogen required to fill the airbag is calculated from the equation of reaction as follows:

Using the ideal gas equation; PV = nRT

where;

From the data provided:

P = 1.30 atm

V = 58 Liters

n = ?

R = 0.082 atm.L.mol⁻¹K⁻¹

T = 495 °C or ( 273.15 + 495) K = 768.15 K

solving for n;

n = PV/RT

n = (1.3 * 58) / (0.082 * 768.15)

n = 1.197 moles

Equation of reaction: 2 NaN₃ → 2 Na + 3 N₂

moles ratio =  2 moles of sodium azide produce 3 moles of N₂

Moles of azide required = 1.197 * 2/3 = 0.798 moles

molar mass of sodium azide = 65 g/mol

mass of sodium azide = 0.798 * 65

mass of sodium azide required = 51.87 g

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The molecular formula of a compound containing 63.88% Cl and 36.12% Ca that has a molecular mass of 443.92 g/mol is Ca₄Cl₈.

Molecular formula is the notation indicating the number of atoms of each element present in a compound.

To calculate the molecular formula of a compound, the empirical formula must first be calculated as follows:

The approximate empirical ratio of Cl and Ca is 2:1, hence, the empirical formula is CaCl₂.

{CaCl₂}n = 443.92

{(40 + 35.5(2)}n = 443.92

111n = 443.92

n = 4

The molecular formula is Ca₄Cl₈.

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Answer:

Ca4Cl8

Explanation:

Canva

2022

The combination of elements that is the most reactive would be caesium and bromine.

The reactivity series of elements is a table that shows how reactive elements are, usually in descending order.

Elements are classified as metals, non-metals, and metalloids. Metals or non-metals that are at the top of the reactivity series are highly reactive and cannot be displaced in solution by metals below them.

Highly reactive non-metals are also usually at the top of the reactivity series of non-metals. They are able to form compounds with a wide variety of elements.

A typical reactivity series of metals include caesium, rubidium, potassium, sodium, lithium, etc. A reactivity series of non-metals include fluorine, chlorine, oxygen, bromine, iodine, etc.

Thus, bromine is more reactive than iodine and caesium is more reactive than potassium and sodium.

The combination of elements that are the most reactive among the options is, therefore, Caesium and Bromine.

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Both calcium oxide and carbon dioxide are inorganic compounds where calcium oxide is an ionic compound with a positive end at calcium and negative end at oxygen and carbon dioxide is a covalent compound formed by two double bonds between carbon and each oxygen.

Calcium oxide is also called soda lime which is an inorganic compound formed by the ionic bonding of oxygen and calcium. Calcium is a metal and it is electron rich with 2 valence electrons.

Oxygen is electronegative gas, having 6 valence electrons and require two electrons to be stable. Thus calcium donates its two electrons to oxygen making calcium a positive ions and oxygen a negative ion.

In carbon dioxide, carbon have a valency of four thus, it forms 4 bonds with two oxygens. Double bonds are formed with each oxygen as shown in the image. These bonds are formed by electron sharing and is called covalent.

Calcium carbonate is formed by passing carbon dioxide through lime (CaO) in which Ca exists as Ca²⁺ ion and carbonate as an anion with three negative charges residing on 2  oxygens in CO₃.

Therefore, the structure of each of these compounds depends on the type of bonds between the atoms and it is depicted in the uploaded image.

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The planet, known as Proxima b, may be warm enough for liquid water to exist on its surface and hence be suitable for life because it is located within the star's "habitable zone."

Applying Kepler's laws: The sun is at the centre of elliptical planetary orbits, according to the first law. Second Law: The radius vector from the sun to a planet covers the same area in exactly the same amount of time. Third Law: For every planet, there is a constant relationship between the cube of the elliptical semimajor axis and the square of the period of revolution.

Since the angular momentum is changing at a rate of zero, the angular momentum must be constant, which implies that the rate of change of the swept-out area for the celestial body's orbit must also be constant. This leads to Kepler's Second Law, which states that celestial objects in orbit cover equal regions in similar amounts of time.

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Answer: 1 gram

Explanation:

- the equation is 1024(.5)^10

• so 1024g is your initial amount and it’s the amount that is being decayed

• since it’s half-life, the decay factor is 0.5

• the half life is 10.47 minutes, so 10.47 minutes would be considered one round of half life.

-basically, if you were finding the half life after 10.47 minutes you would use the equation 1024(.5)^1.

-as said, it’s raised to the 1st power because 10.47 minutes is one round.

• since you’re looking for the amount after 104.7 minutes, the equation is raised to the 10th power because 104.7 / 10 = 10.47. so 104.7 is 10 rounds of half-life.

- so 1024(.5)^10 = 1

so the half-life of 1024g of Cobalt-60 after 104.7 minutes is 1

hope this helps :)

According to the Planck's equation which is E= hc/λ the total energy  of 9.4×10¹⁶ photons is 43.446×10[tex]^-17[/tex] J.

Max Planck  discovered the theory which stated that energy is transferred in the form of discrete packs which are called quanta  and thus proposed an equation called the Planck's equation which relates energy and frequency of a photon and is given as, E=hcυ or in terms of wavelength it is ,E=hc/λ.

The equation makes use of a constant which is called the Planck's constant and it's value is 6.626×10[tex]^-34[/tex] Js.

Substituting the given value of wavelength of  one photon  in the above formula containing wavelength,E=6.626×10[tex]^-34[/tex]×3×10⁸/4.3×10⁷=4.622×10[tex]^-33[/tex] J.

Now, for energy of 9.4×10¹⁶ photons =4.622×10[tex]^-33[/tex]×9.4×10¹⁶=43.446×10[tex]^-17[/tex] J.

Thus, the energy of 9.4×10¹⁶ photons is 43.446×10[tex]-17[/tex] J.

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From the calculations, the molarity of the iodine solution is 0.025 M and the mass of the arsenic oxide solution is 0.066 g.

Let us recall that the molarity is defined as the ratio of the number of moles to the volume of the solution. It is a measure of the amount of substance present. Ley us now try to use what we know to obtain the molarity of the solution in each of the cases of the questions.

a) Using;

CAVA/CBVB = NA/NB

CA = Amount of thiosuphate

CB = Amount of iodine

VA = volume of thiosuphate

VB = volume of iodine

NA = number of moles of thisulphate

NB = Number of moles of iodine

Hence;

0.1047 M * 18.59 mL/CB * 38.62 mL = 2/1

0.1047 M * 18.59 mL * 1 = CB * 38.62 mL * 2

CB = 0.1047 M * 18.59 mL * 1 /38.62 mL * 2

CB = 1.946/77.2

CB = 0.025 M

b) Using the formula;

Number of moles = concentration * volume

Number of moles = 0.025 M * 26.64 /1000 L

= 6.66 * 10^-4 moles

Again;

1 mole of the arsenic oxide reacts with 2 moles of iodine solution

x moles of the arsenic oxide reacts with 6.66 * 10^-4 moles of iodine

x = 1 mole *  6.66 * 10^-4 moles/ 2 moles

x = 3.33  * 10^-4 moles

Mass of the arsenic oxide = 3.33  * 10^-4 moles * 197.8 g/mol

= 0.066 g

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Answer:

In the early 1900's, Paul Drüde came up with the "sea of electrons" metallic bonding

To solve such type of question we must be knowing the concept behind the ideal gas equation. The final pressure of the gas mixture after the addition of the Ar gas is 2.25 atm

Ideal gas equation is the mathematical expression that relates pressure volume, temperature and number of moles of gas

Mathematically,

PV=nRT

according to question T and V is constant

P ∝ n

P₁/n₁= P₂/n₂

Where

P₁ = initial pressure= 0.75atm

P₂ = Final pressure=?

n₁= number of moles of gas initially present=n

n₂ = Final moles of gas present=2n

Substituting into the given equation

P₂= P₁n₂/n₁

P₂ = 0.75atm ×2n/n

P₂ = 1.5 atm

The total pressure of the gas=partial pressure of N2 +  partial pressure after addition of Ar = 0.75 atm + 1.5 atm = 2.25 atm

The final pressure of the gas mixture after the addition of the Ar gas is 2.25 atm

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The arrangement of electrons in orbitals around an atomic nucleus is known as electronic configuration. It is also known as electronic structure or electron configuration. It follows Aufbau's principle, Hund's rule and Pauli's exclusion principle, to fill the electrons in various orbitals according to the energy of the orbitals.

Calcium has 20 electrons, that is, the atomic number of Ca = 20

Hence its electronic configuration will be, 1[tex]s^{2}[/tex] 2[tex]s^{2}[/tex] 2[tex]p^{6}[/tex] 3[tex]s^{2}[/tex] 3[tex]p^{6}[/tex] 4[tex]s^{2}[/tex]

Now, since Argon has 18 electrons, that is, the atomic number of Ar = 18, its electronic configuration will be,

                             Ar =   1[tex]s^{2}[/tex] 2[tex]s^{2}[/tex] 2[tex]p^{6}[/tex] 3[tex]s^{2}[/tex] 3[tex]p^{6}[/tex]

Thus , the simplified electronic configuration of Calcium is,

                                 Ca = [Ar]4[tex]s^{2}[/tex]

Thus, option d)  [Ar]4[tex]s^{2}[/tex] is the correct answer.

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