Can someone please help me solve this and walk me through the steps to help my understanding?
A precipitation reaction occurs when 791 mL of 0.765 M Pb(NO3)2 reacts with 549 mL of 0.861 M KI, as shown by the following equation.

Pb(NO3)2(aq)+2KI(aq)⟶PbI2(s)+2KNO3(aq)
Calculate the theoretical yield of PbI2 from the reaction.
Calculate the percent yield of PbI2 if 88.6 g of PbI2 are formed experimentally.

Answer:

Explanation:

Many materials can be used in making textiles. The materials are mainly from animal, plant, mineral and synthetic sources. The examples are as follows;

The percentage by mass of sodium in a 25 g sample of sodium chloride =39.92%

A chemical compound is made up of two or more elements which are chemically combined together.

For example sodium chloride which contains sodium and chloride are chemically combined together to form sodium chloride as a chemical compound.

The first compound of sodium chloride= 5g

The percentage that is sodium= 39.34%

The second compound of sodium chloride= 25g

The percentage that is sodium= x%

That is = 5g = 39.34%

Therefore quality of sodium in grams;

= 39.34/100× 5

= 0.3934× 5

= 1.967g

Therefore if 5g of NaCl contains 1.967g of Na

25g of NaCl will contain xg

Make xg the subject of formula,

= 25×1.978/5

= 49.45/5

= 9.98g of sodium.

To conver 9.98g to %;

=9.98/25 × 100/1

= 0.3992×100/1

= 39.92% of sodium.

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Utilize this chemical equation balancer to balance the Al + HCl = AlCl3 + H2 reaction! ... It's possible that the equation 2Al(s) + 6HCl(aq) = 2AlCl3(aq) + 3H2(g) is ionic.

Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.

Experts disagree that drinking hydrogen water has any hazards. However, they are unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hyponatremia, which can be fatal, can result from excessive water intake.

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Answer:

6186.98

Explanation:

105.4 mol of nickel is 6186.98 nickel

The following factors can affect the solubility of a substance is temperature and pressure

Solubility is the maximum amount of substances that will dissolve in a given amount of solvent at specific temperature and solubility is the characteristics property of specific solute and solvent combination and different substances has greatly different solubility's and there are two direct factor that affect the solubility and they are temperature and pressure and temperature affect solubility of both solid and gases but pressure only affect the solubility of gases

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The change in the total energy of the system is -93.1kJ.

Let us note that the term thermodynamics has to do with the study of heat. Recall that heat is that which leads to the increase in the temperature of a body. From the first la of thermodynamics, we know that heat can neither be created nor destroyed but can be transformed from one form to another as we can see.

We also know from the first law of thermodynamics that;

ΔE = q + w

ΔE  = total internal energy

q = heat absorbed or evolved

w = work done

Let us find the work done as;

w =pΔV

w = 45.0 atm (3 - 8.8)

w = -261  atm L or -26.4 kJ

We have q as  -66.7 kJ  because heat was released

ΔE  = -66.7 kJ - 26.4 kJ

ΔE  = -93.1kJ

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Kinds of intermolecular forces exist between acetone molecules is Hydrogen bond.

A. CH3 -C-CH3.

B. The molecular is nonpolar.

C. Dipole-dipole interactions.

D. CH3-CH₂-OH → 1-proposal if dissolves in water form the strong Hydrogen bonding Acetone with water when Compare with 1-prop and have more strong Hydrogen bonding due to its bending 1-propenal has more boiler point.

Molecules with oxygen atoms nitrogen atoms or ionizable groups -CO2H and -SO3H tend to be polar. A non-polar molecule is a molecule that does not have regions of positive and negative charge. Ethane is an example of a non-polar substance. A bond is considered nonpolar if the electronegativity difference is less than about 0.4.

When things are different at both ends we call them polar. Also, some molecules have positive and negative ends, and when they are present, we call them polar. Otherwise, it is called non-polar. Polar things can attract or repel each other. Opposite charges attract and charges repel.

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Answer:

chicken tenders and egg rolls and butter fingers

Atomic numbers are the numbers possessed by an element in a periodic table. These numbers are used to identify an element and their position in the periodic table.

The atomic number of an element is equal to its proton and electron number but not its neutron

Hence we can conclude that the correct information about the atomic number of an element includes:

• The number of protons

• The element position on the periodic table

Will Argon, Neon, and Krypton react same

Noble gases only helium and neon are truly inert and the other noble gases will react on a limited scale under very specific conditions and krypton will form a solid with fluorine, and xenon will form a variety of compounds with oxygen and fluorine and the name comes from the fact that these elements are virtually unreactive towards other elements or compounds and they do not react with other element

Neon is a colorless, odorless, unreactive gas and argon is a colorless, odorless, unreactive gas and krypton is a colorless, odorless, unreactive gas

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A certain gas is present in a container obeys Boyles law.

The Boyles law stated that if the temperature and amount of gas remain constant within a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it fills.

Boyles law can be expressed as

P1V1 = P2V2

As per Boyles law P= k / V

So, Pi = ki / Vi

Ki = Pi Vi

   = 2.0 x 11.0 = 22.0 atm-L

Thus for Kf

Kf = Pf Vf

   = 4.0 x 5.5 = 22.0 atm-L

Thus Ki = Kf

This signify that it obeys Boyles law.

Thus, a certain gas is present in a container obeys Boyles law.

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Answer:

proton= 17

neutron=18

electron=16

Answer:

6. Al
7. 3

Explanation:

When looking at ionization energies to find the number of valence electrons, look for big jumps in ionization energy. The jump from first to second is big, but it's only about 1200 kj/mole (which is considered to be a medium small jump). This means that the first electron and second electrons are both likely valence electrons (since the energy needed to remove them is relatively small). From second to third, the change in ionization energy is less than 1000 kj/mole. Since the third ionization energy is also quite small, the third electron is also likely to be a valence electron. However, looking at the change in ionization energy from the third to the fourth, the jump/difference in ionization energy is nearly 9000 kj/mole! That's 7 to 9 times the amount of the previous jumps. From this, we can reasonably assume that this is a core electron, which takes lots of energy to remove from an atom. Therefore, the fourth electron is a core electron, and this atom only has 3 valence electrons. Now, we can answer question 7. It is C. From this, look at number 6. Na only has 1 valence electron, Mg only has 2 valence electrons, Si has 4 valence electrons, and only Al has 3 valence electrons. Since this mystery element X has 3 valence electrons and Al also has 3 electrons, Al is the most fit for the data given. So the answer to number 6 is C) Al

tl;dr there is a jump of ionization energy from the 3rd ionization energy to the 4th ionization energy so that means that the 4th electron is a core electron, and the element only has 3 valence electrons. Al has 3 valence electrons

The maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.

The formula for the the limiting reagent is H₂

The amount of excess reagent that remains after the reaction is 3.86 g.

The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.

The limiting reagent is determined by balancing the chemical equation as follows;

H₂ + C₂H₄  --------> C₂H₆

From the reaction above;

1 mole of hydrogen gas = 1 mole of ethylene = 1 mole of ethane

2 g of hydrogen gas (H₂)  = 30 g of ethane (C₂H₆)

0.61 g of H₂ = ? of C₂H₆

= (0.61 x 30)/2

= 9.15 g of C₂H₆

Thus, the maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.

The formula for the the limiting reagent is H₂ because it will be completely used up.

2 g of H₂ = 28 g of C₂H₄  -

0.61  of H₂ = ?

= (0.61 x 28)/2

= 8.54 g

Excess mass of the ethylene that remains = 12.4 g - 8.54 g = 3.86 g

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The equation representing the heat of reaction in letters is ΔH = q = [tex]cp_{sp}[/tex] x m x (ΔT)

Heat of reaction is also known as Enthalpy of the reaction. It is a measurement used in thermodynamics energy that was produced or released in a reaction. ΔH represents change in heat or enthalpy

Heat of reaction, ΔH = q = [tex]cp_{sp}[/tex] x m x (ΔT)

where,

ΔH and q represents heat of reaction

m represents the mass of the reaction medium

[tex]cp_{sp}[/tex] represents the specific heat capacity

ΔT represents the difference in temperature of the medium

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The correct formula of  the dicarbon tribromide molecule is shown as [tex]C_{2} Br_{3}[/tex].

The chemical formula is the representation of a compound on paper. It is the way by means we are able show the way that atoms of a compound are connected to each other. We often use this method to show the representation of a compound in way that is somewhat intelligible to someone who needs to understand it.

We are now going to try to see how we could be able to find the correct formula of the compound knowing all the subscripts required in the process.

Now, most importantly, the formula must show the number of atoms of each of the elements that are in the compound. Looking at what we have, we are asked to find the formula of the compound dicarbon tribromide. We already know that there would be two atoms of carbon and three atoms of bromine in the compound.

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The statement that is true if the ΔEsys = -100 J is that the system looses 100J  of energy which is gained by the surroundings.

Note that the study of energy is what we call thermodynamics. We should note that according to the laws of thermodynamics, energy can not be created nor destroyed but can be converted from one form to another.

This implies that the energy that is lost by the system must be gained by the surroundings since there can never be energy that goes to waste in the system.

Recall that the universe is composed of the system and the surroundings and the energy that is lost by the system must be gained by the surroundings and vice versa. This would now be our guide in deciding which statement is right above from what we have in the question here.

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The group that accounts for the difference among the various amino acids is the side chain (option B).

Amino acids are any chemical molecule that has both an amino and a carboxylic acid functional group.

The antecedents or building blocks of protein molecules are known as amino acids. Ingredients that make up amino acids include:

The R group, a particular side chain, is also joined to the carbon in each of the 20 amino acids. The shapes, sizes and charges of the R groups vary. As a result, amino acids can be categorized based on the characteristics of their side chains.

All amino acids have the same amino and carboxyl groups; the R group, however, differs for each amino acid.

In nature, there are 20 different amino acids, each of which has an amino and carboxyl group. However, what sets them apart from one another is that they each have a unique R (side) chain.

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Condensation is a chemical reaction of synthesis and represents two organic molecules producing one organic molecule.

Condensation reaction is a reaction of two substances with the simultaneous loss of water or other small molecule.

Condensation reaction is a chemical reaction that synthesizes larger molecules from two or more smaller molecules with the release of water.

An example of condensation reaction is the synthesis of dipeptide (protein) from amino acids building blocks.

Therefore, it can be said that condensation synthesizes larger organic molecules from two smaller ones.

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An object’s displacement is the distance and direction of the object’s change in position.

Displacement in physics is the quantity which denotes distance with a directional component.

Displacement and distance are two inter-related terminologies that are often misused, however, they differ being that displacement is a vector quantity while distance is a scalar quantity.

This means that displacement has direction and magnitude, hence, can be defined as the distance and direction of an object’s change in position.

Displacement is denoted by ∆x and is calculated by dividing the change in position by time taken.

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The unknown elements based on their physical properties are as follows:

Element 1 is Krypton

Element 2 is Strontium

Element 3 is Lead

Element 4 is Bromine

Element 6 is Francium

Some of the physical properties of elements used to identify the elements include:

Considering the properties of the given elements from the periodic table:

Element 1 = Krypton

Element 2 = Strontium

Element 3 = Lead

Element 4 = Bromine

Element 5 = Copper

Element 6 = Francium

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The bonds do not have energy, the atoms release heat.

change: unmarried alternative AB + C → AC + B

exchange: Double alternative AB + CD → ad + CB

mixture (Synthesis) A + B → AB

Decomposition AB → A + B

A chemical reaction is a method that ends in the chemical transformation of one set of chemical substances to some other.

A procedure that includes rearrangement of the molecular or ionic shape of a substance, in preference to a exchange in bodily form or a nuclear reaction.

A chemical response is a technique in reactants react chemically and convert into products via chemical transformation. as an example, breathing – we inhale oxygen which reacts with glucose and produces carbon dioxide, water and strength. The response is given below. C6H12O6 + 6O2 → 6CO2 + 6H2O + power.

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Water has a molar mass of 18 g/mol while propane has a molar mass of 44 g/mol.

As a result, 44.0 g (1 mole) of propane will burn in order to produce 4 moles of water.

Mass of water obtained =4×18=72.0 g.

Propane undergoes burning with hydrocarbons to release its chemical energy. An animation of hydrocarbon combustion is shown here to demonstrate the overall process that happens when oxygen and propane mix. One instance of an exothermic process is the hydrocarbon combustion reaction, which produces heat energy.

A fuel and an oxidant, often atmospheric oxygen, engage in a high-temperature exothermic (heat-releasing) redox (oxygen-adding) chemical reaction during combustion that results in oxidised, frequently gaseous products in a mixture known as smoke.

The balanced chemical equation for the total combustion of propane states .

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Covalent bonds and ionic bonds differ as follows: ionic bonds form by the transfer of electrons. Covalent bonds form by sharing electrons. In ionic bonding, electrons are completely transferred from one atom to

another. In the process of either losing or gaining negatively charged electrons, the

reacting atoms form ions. Ions that have a positive charge are called cations and the ones that have a negative charge are called anions. On the other hand, covalent bonds can be formed by any equal or unequal sharing of electrons. The substances formed by ionic bonds are called compounds and those formed by covalent bonds are referred to as molecules (option 2).

Ionic bonds are a type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.

On the other hand, a covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

Ionic bonds occur between metals, which lose electrons, and nonmetals, which gain electrons. Ions with opposite charges will attract one another creating an ionic bond.

Also, covalent bonds form when two atoms of similar charges share electron pairs.

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The number of breadths supplied by the 200 atm scuba tanks, found using Boyle's law, taking the air as an ideal gas are as follows;

First tank with 14.2 L volume delivers 1,893.[tex]\overline 3[/tex] breadths of air

The second tank with 11.4 L volume, delivers 1,520 breadths of air

An ideal gas is a gas that is not subject to particle to particle interactions, and consists of many particles

The given parameters are;

Pressure air in the two scuba tanks, P₁ = 200 atm

Volume of air in the first tank, V₁₁ = 14.2 L

Volume of air in the second scuba tank, V₁₂ = 11.4 L

Volume of air delivered for each breadth, Vₐ = 1.5 L

Pressure of air delivered by the tank regulator, P₂ = 1 atm.

According to Boyle's law, at constant temperature, the pressure  of a given mass of gas is inversely proportional to its volume

Mathematically, we have;

P ∝ V

P₁·V₁ = P₂·V₂

The volume occupied by a given number of breadths, n, Vₙ = Vₐ × n

According to Boyle's law, the number of breadths supplied by the first tank is therefore;

P₁·V₁₁ = P₂·Vₐ·n

Which gives;

[tex]n = \dfrac{P_1\cdot V_{11}}{P_2 \cdot V_a}[/tex]

Therefore;

[tex]n = \dfrac{200\times 14.2}{1 \times 1.5}\approx 1893.\overline 3[/tex]

The number of breadths supplied by the first tank is 1,893.[tex]\overline 3[/tex] breadths

Similarly, the number of breadths supplied by the second tank is given by the formula;

P₁·V₁₂ = P₂·Vₐ·n

[tex]n = \dfrac{P_1\cdot V_{12}}{P_2 \cdot V_a}[/tex]

[tex]n = \dfrac{200\times 11.4}{1 \times 1.5}\approx 1893.\overline 3 = 1,520[/tex]

The number of breadths supplied by the second tank is 1,520 breadths

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Answer:

A. True

Explanation:

The molecular weight of oxygen gas is 32 grams per mole, and we calculate the weight of the atmosphere based on this estimate.

Solution:

PV = nRT

6.30 x 1.95 = n x 12.285 x 290

n = 0.6226 moles.

The molar weight of oxygen gas is 32 grams, mol on which to estimate the atmospheric weight. Irregular Edges Edges are often jagged chipped or blurred. The pigment can spread to the surrounding skin. Uneven Colors Black brown and tan shades may be present. White, gray red, pink, or blue areas can also be seen.

If the mole is larger than other moles has dirty or uneven edges is uneven in color, or is slightly pink see a doctor for an examination. please give me. Bruises that appear in adulthood should be checked. However, the most worrying sign is the change in the mole. Experts believe that genetic factors, hormonal changes, and sun damage can cause new moles to suddenly appear, but no one knows for sure.

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The pairs that are likely to form an ionic bond are;

Let us recall that a compound is formed if we are able to join the atoms of two elements together. There are basically three kinds of bonds that we can have in a substance and these are;

If the two elements are now bonded in the compound the properties of each of the atoms is now modified and what we now have is the singular properties of the compound.

We can see a list of several compounds and we  are to find out if the bond that the atoms have between them is an ionic or not. This has been done in the section above and we can see there the compounds that are most likely to have an ionic bond.

Note that in the ionic bond, there is a transfer of electrons from one atom to the other. This can be shown by the use of an arrow. The transfer would always occur from the atom of a metal to the atom of a non metal.

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