Through the alveoli, oxygen inhaled through the lungs enter the bloodstream.
What is the definition of the respiratory system?The respiratory system is a biological system consisting of certain organs and structures used for gas exchange in animals and plants. The anatomy and physiology that cause it to vary greatly depending on the size of the organism, the environment in which it lives, and its evolutionary history. In terrestrial animals, the respiratory surface is inserted into the mucous membranes of the lungs. Gas exchange in the lungs takes place in millions of tiny air sacs; in mammals and reptiles, they are called alveoli and in birds atrium. These microscopic air sacs have a very rich circulation, which brings the air into close contact with the blood.
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Reduction can be described as:A. the gain of electrons.B. None of theseC. the gain of an OH group.D. the loss of an OH group.
Answer
A. the gain of electrons.
Explanation
Oxidation and reduction are complementary reactions. Oxidation is the process involving with loss of electrons or an increase in oxidation state by a molecule, atom, or ion while reduction is the process of gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
Hence, the correct answer to your question is option A. the gain of electrons.
7a. What will the triangle H value be if 2 moles of solid carbon react with oxygen?
Solid carbon fuels having a high energy density in volume include coal and biomass. They are widely dispersed throughout the entire world. They are currently the main energy sources used in traditional thermal power plants to produce electricity.
What is Triangle H value ?A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.
It is employed to figure out how much heat a chemical reaction produces. In calorimetry, heat flow is measured using the change in enthalpy. It is measured to assess a Joule-Thomson expansion or throttling process. To determine the minimum power required for a compressor, enthalpy is employed.
What is Solid carbon ?The goal of Solid Carbon is to securely and permanently store carbon dioxide (CO2) in rocks. Direct CO2 extraction from the atmosphere or ocean is the goal.
Injection of carbon dioxide causes gas bubbles to rise up like champagne bubbles from the liquid metal. The gas molecule splits up into flakes of solid carbon in a matter of nanoseconds as the bubbles pass through the liquid metal.
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energy being released like when fireworks are set off are an example of physical or chemical change
Answer:
A chemical change
How does the atomic radius change going down and across the periodic table? (1 point)
Answer:
Larger atomic radius as you go down a column.
Smaller atomic radius as you go across a period.
Explanation:
Going down the periodic table, the atomic radius increases because each new period adds a new energy level/electron shell. New orbitals must be added outside of the pre-existing orbitals, expanding the atomic radius. For instance, the third period introduces the third energy level (3s) versus the fifth period which introduces the fifth energy level (5s).
Going across the periodic table, the atomic radius decreases because the number of protons within the nuclei increases. When there are more positively-charged protons, they have a greater pull on the negatively-charged electrons, thus brining them closer to the nucleus and shrinking the atomic radius. For instance, the atomic radius of chlorine (17 protons) is smaller than the atomic radius of the elements which lie to its left, such as phosphorus (15 protons) and sulfur (16 protons).
4NH3 + 502 = 4NO + 6H2O if 17 moles of 02 are reacted how many grams of NO are produced
INFORMATION:
We have the next balanced equation
[tex]4NH_3+5O_2\rightarrow4NO+6H_2O[/tex]And we must find how many grams of NO are produced if 17 moles of O2 are reacted
STEP BY STEP EXPLANATION:
To find how many grams of NO are produced if 17 moles of 02 are reacted, we must analyze the equation.
We can see in the equation that:
- 1 mole of NH3 (on complete reaction) gives 1 mole NO.
- 5 moles of O2 produce 4 moles of NO, so 1 mol of O2 gives 4/5 = 0.8 mole of NO.
Thus, O2 will be the limiting reactant.
Now, if 17 moles of O2 are reacted, we must calculate the number of moles of NO that will be produce multiplying 0.8 by 17
[tex]Number\text{ }of\text{ }moles\text{ }NO=17*0.8=13.6mol[/tex]Then, using the molecular mass of NO (30.01 g/mol), we can calculate the number of grams that are produced
[tex]Number\text{ }of\text{ }grams\text{ }NO=13.6mol*30.01\frac{grams}{mol}=408.136\text{ grams}[/tex]ANSWER:
408.136 grams of NO are produced if 17 moles of O2 are reacted.
The concentration of cholesterol (C27H46O) in normal blood is approximately 0.005 M.How many grams of cholesterol are in 610 mL of blood?Express your answer to one significant figure and include the appropriate units
Answer
The grams of cholesterol in 610 mL of blood to one significant figure = 1.0 g
Explanation
Given:
The concentration of cholesterol (C27H46O) in normal blood = 0.005 M
The volume of blood = 610 mL = 0.610 L
What to find:
The grams of cholesterol in 610 mL of blood.
Step-by-step solution:
Step 1: Determine the moles of cholesterol.
The number of moles of cholesterol in the blood can be calculated using the molarity formula, which is
[tex]\begin{gathered} Molarity=\frac{Moles}{Volume\text{ }in\text{ }L} \\ \\ Moles=Molarity\times Volume\text{ }in\text{ }L \\ \\ Moles=0.005\text{ }M\times0.610\text{ }L \\ \\ Moles=3.05\times10^{-3}\text{ }mol \end{gathered}[/tex]Step 2: Calculate the molar mass of cholesterol.
Using the atomic masses of (H = 1.00784, C = 12.011, O = 15.999) from the periodic table, the molar mass of cholesterol is calculated as follows:
[tex]\begin{gathered} C_{27}H_{46}O=(27\times12.011)+(46\times1.00784)+15.999 \\ \\ C_{27}H_{46}O=324.297+46.36064+15.999 \\ \\ C_{27}H_{46}O=386.68\text{ }g\text{/}mol \end{gathered}[/tex]Step 3: Determine the grams of Cholesterol.
The grams of cholesterol in 610 mL of blood will be:
[tex]\begin{gathered} Mass=Moles\times Molar\text{ }mass \\ \\ Mass=3.05\times10^{-3}\text{ }mol\times386.68\text{ }g\text{/}mol \\ \\ Mass=1.179\text{ }grams\approx1.0\text{ }gram \end{gathered}[/tex]Hence, the grams of cholesterol in 610 mL of blood to one significant figure is 1.0 g.
Answer the questions based on the diagram.
How many electrons are in the n = 1 shell?
How many electrons are in the n = 2 shell?
How many electrons are needed to complete fluorine's outer shell?
How many electrons are being shared between the two fluorine atoms?
How many bonds exist between the two fluorine atoms?
The correct solution to the task above according to the diagram is given below:
(a) There are 2 electrons in the n = 1 shell(b) There are 7 electrons in the n = 2 shell(c) The number of electrons needed to complete fluorine's outer shell is 1(d) Two electrons are being shared between two different fluorine atoms.(e) The number of bonds which exist between the two fluorine atoms is 1, a single bond.The complete diagram is attached.
What is meant by n = 1 shell?The n = 1 shell simply refers to first shell in the electron orbit of an atom; specifically, shell k. The maximum number of electrons which shell k or n = 1 can accommodate or take is just 2.
So therefore, it can be deduced from above that the shell k is the same as n = 1 .
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what is change in velocity from the time he begin pushing to when he stops pushing
Acceleration is the change in velocity from the time he starts pushing to when he stops.
What is the definition of velocity?Velocity narrates how position changes, acceleration relates to how velocity changes. We can use this formula to answer velocity for the acceleration of the table Aston pushes a table across the floor with a force of 6 N. Assume the table has a mass of 6 kg and he pushes the table for 2 seconds. they may source of motion; they may also slow, stop, or velocity changes the path of an object at a time, and the forces can push or pull in any direction.
So we can conclude that At end velocity, the speed is not changing. If the speed is not changing, there is no force on the stage on the falling object or the forces acting on it are in.
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A 2.85 g sample of an unknown gas at 73 ∘C and 1.00 atm is stored in a 2.75 L flask. What is the density of the gas?
The density of the unknown gas would be 0.0010 g/[tex]cm^3[/tex].
DensityThe density of a substance is a property that measures the level of compactness of the substance. The density of a substance is the ratio of the mass of the substance and its volume.
The density of a substance can be mathematically expressed as:
Density = mass in g/volume in [tex]cm^3[/tex].
In this case, the volume of the gas is given as 2.75 L while the mass is given as 2.85 g.
2.75 L of gas is equivalent to: 2.75 x 1000
= 2750 [tex]cm^3[/tex]
Thus, the density of the gas = 2.85/2750
= 0.0010 g/[tex]cm^3[/tex]
In other words, the 2.95 g sample of an unknown gas stored in a 2.75 L flask will have a density of 0.0010 g/[tex]cm^3[/tex].
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Burning 1000.00 grams of glucose (C6H12o6) will produce how much carbon dioxide in grams
This is a stoichiometry problem, where we have an initial amount of reactant and we need to find out how much of the product will we end up with, in order to do that we need to:
1. Set up the properly balanced equation,
C6H12O6 + 6 O2 -> 6 CO2 + 6 H2O
2. See how many moles of reactant there are in the given amount of grams, we have 1000 grams, the molar mass of glucose is 180.16g/mol
180.16g = 1 mol
1000g = x moles
180.16x = 1000
x = 1000/180.16
x = 5.55 moles of glucose in 1000 grams
3. Check the molar ratio between the two compounds, as we can see from the balanced equation, the molar ratio is 1:6, 1 mole of glucose to produce 6 moles of CO2, therefore if we have 5.55 moles of glucose:
1 C6H12O6 = 6 CO2
5.55 C6H12O6 = x CO2
x = 33.3 moles of CO2
4. Calculate how many grams will be equal to the number of moles that we found out, the number of moles is 33.3 moles, and the molar mass of CO2 is 44.01g/mol
44.01g = 1 mol
x grams = 33.3 moles of CO2
x = 33.3 * 44.01
x = 1465.5 grams of CO2 are produced
What does the absorption spectrum of an atom show?OA. The amount of energy that is absorbed as the element changesphaseB. The temperature of the phase transitions of the element atdifferent pressuresC. The wavelengths of light that an atom gives off when electrons falback to lower energy levelsOD. The wavelengths of light that cause the electrons in the atom tomove to higher energy levels
The absorption spectrum of an atom is widely used to determine specific elements in different places, like different planets for example, and as the name suggests, this spectrum is the opposite of the emission spectrum and it is related to the absorption of energy in form of light. Therefore the best explanation for absorption spectrum is the electron moving to a higher energy level, since it is absorbing energy. Letter D is the best option, since letter c
Why does zinc only form a 2+ ion?
Answer:
this is almost true based on its electronic structure zinc only forms a 2+ ion
Explanation:
Particle X has 16 protons, 17 neutrons and 18 electrons. Particle X
a. an atom of a metal
b. an atom of a noble gas
c. an anion
d. a cation
Particle X has 16 protons, 17 neutrons and 18 electrons. Particle X will be an anion.
As we know that for an atom the atomic number is equal to the number of protons and the number of electrons present in that atom.
And for this given atom, the number of protons are 16 while the number of electrons are 18. This is only possible when the atom has gained some electrons which made it an anion.
Anions are ions that are negatively charged. Ions are charged atoms or molecules. If a balanced atom gains one or more electrons, it will become a negatively charged anion.
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What quantity in moles of Li₂S will be required to completely react with 45.0 mL of 0.100 M Fe(NO₃)₃?
3 Li₂S(aq) + 2 Fe(NO₃)₃(aq) → Fe₂S₃(s) + 6 LiNO₃(aq)
Moles of Li₂S will be required to completely react with 45.0 mL of 0.100 M Fe(NO₃)₃ is 0.00675 moles.
The reaction is as follows :
3 Li₂S(aq) + 2 Fe(NO₃)₃(aq) → Fe₂S₃(s) + 6 LiNO₃(aq)
Molarity = mol / V in L
Molarity = 0.100 M
Volume = 45.0 mL = 0.045 L
now , putting the values in formula :
M = mol / V
mol = M × V
moles = 0.100 × 0.045
moles = 0.0045 moles of Fe(NO₃)₃
from the equation it is clear that :
2 moles of Fe(NO₃)₃ react with 3 moles of Li₂S
therefore, 0.0045 moles of Fe(NO₃)₃ react with = (3 × 0.0045 ) / 2
= 0.00675 moles of Li₂S
Thus, Moles of Li₂S will be required to completely react with 45.0 mL of 0.100 M Fe(NO₃)₃ is 0.00675 moles.
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Scenario: You are an employee of the Dupont Chemical Industry working with a team off 3-4 chemists. The laboratory division for which you work for focuses on the synthesis of ammonia (NH3) from hydrogen and nitrogen. (This reaction is commonly referred to as the Haber Process) Your supervisor has informed your group that he needs you to produce at least 125 grams of ammonia by the end of the day or else your division will be shut down. When checking your supplies you realize that you have exactly 100 grams of nitrogen and 30 grams of hydrogen gas. Will your group still be employed at the end of the day? Show all dimensional analysis steps that are necessary to this problem. What is the maximum amount of ammonia that can be made given your supplies?
Firstly, we need to write the equation for the process.
We start with hydrogen gas, H₂, and nitrpgen gas, N₂, and end with NH₃, so the unbalanced reaction is:
[tex]H_2+N_2=NH_3[/tex]To balance it, we can add a coefficient of 2 to NH₃ so that N gets balanced and then we will need to add a coefficient of 3 to H₂ so H gets balanced:
[tex]3H_2+N_2=2NH_3[/tex]With the balanced reaction, we will need the molar mass of each component, which we can calculate using the molar masses of the atoms H and N:
[tex]\begin{gathered} M_{H_2}=2\cdot M_H=2\cdot1.00794g\/mol=2.01588g\/mol \\ M_{N_2}=2\cdot M_N=2\cdot14.0067g\/mol=28.0134g\/mol \\ M_{NH_3}=1\cdot M_N+3\cdot M_H=1\cdot14.0067g\/mol+3\cdot1.00794g\/mol=17.03052g\/mol \end{gathered}[/tex]Now, we need to convert the masses of nitrogen gas and hydrogen gas to number of moles:
[tex]\begin{gathered} M_{H_{2}}=\frac{m_{H_2}}{n_{H_{2}}} \\ n_{H_2}=\frac{m_{H_2}}{M_{H_{2}}}=\frac{30g}{2.01588g\/mol}=14.8818\ldots mol \end{gathered}[/tex][tex]\begin{gathered} M_{N_{2}}=\frac{m_{N_2}}{n_{N_{2}}} \\ n_{N_2}=\frac{m_{N_2}}{M_{N_{2}}}=\frac{100g}{28.0134g\/mol}=3.5697\ldots mol \end{gathered}[/tex]Now, we need to find which of the two is the limiting reactant, that is, which we have less considering the ratio they react.
Each 1 mol of N₂ that react will need 3 mol of H₂, so if all the 3.5697... mol of N₂ react, than we will need
[tex]3\cdot3.5697\ldots mol=10.7091\ldots mol[/tex]10.7091... mol of H₂. Since we have 14.8818 mol of H₂, we have excess of H₂, which means that N₂ is the limiting reactant.
Since H₂ is the limiting reactant, the most that we can produce of NH₃ is the corresponding of 3.5697... mol of reacting N₂.
From the equation again, we can see that each mol of N₂ that reacts will produce 2 mol of NH₃, so if all the limiting 3.5697... mol react, we will get:
[tex]2\cdot3.5697\ldots mol=7.1394\ldots mol[/tex]7.1397... mol of NH₃, so this is the maximum number of moles we can get of NH₃:
[tex]n_{NH_{3}}[/tex]Using the molar mass of NH₃, we can convert this to mass:
[tex]\begin{gathered} M_{NH_{3}}=\frac{m_{NH_3}}{n_{NH_{3}}} \\ m_{NH_3}=n_{NH_3}\cdot M_{NH_3}=7.1394\ldots mol\cdot17.03052g\/mol=121.58\ldots g\approx121g \end{gathered}[/tex]So, the maximum mass of NH₃ you can produce with the given masses of reactant is 121 grams, which is not enough for whats has been asked.
Two compounds that have different structures ( and thus different condensed formulas) but the same molecular formula are known as:Group of answer choicesAllotropesIsomersIonsFunctional groups
Explanation:
Isomers are molecules of organic substances that have the same molecular formula but have different properties and structural characteristics.
Answer: Isomers
Complete and balance each of the following equations. If no reaction occurs, enter NOREACTION.
Answer
Part A:
Given equation:
[tex]KI_{(aq)}+BaS_{(aq)}\rightarrow[/tex]The above equation is an example of a double replacement reaction. A double replacement (or double displacement) reaction is a reaction in which the positive and negative ions of two ionic compounds exchange.
Note: The oxidation number of:
K = +1
I = -1
Ba = +2
S = -2
So, the complete chemical equation including phases of the given reaction is:
[tex]2KI_{(aq)}+BaS_{(aq)}\rightarrow BaI_{2(aq)}+K_2S_{(s)}[/tex]Part B:
Given equation:
[tex]KCl_{(aq)}+CaS_{(aq)}\rightarrow[/tex]Also, the equation is an example of a double replacement reaction.
Note: The oxidation number of:
K = +1
Cl = -1
Ca = +2
S = -2
The complete chemical equation including phases of the given reaction is:
[tex]2KCl_{(aq)}+CaS_{(aq)}\rightarrow K_2S_{(s)}+CaCl_{2(aq)}[/tex]
What is the average speed of a car that traveled 300.0 miles in 5.5 hours?
Answer:
51 mph
Explanation:
Given that Fe (iron) has a specific heat capacity
of 0.4490 J/g.°C, what is the heat energy (in J)
needed to raise the temperature of a 30.00 g Fe
cube from 40.0 °C to 100.0 °C?
808.2J heat energy needed to raise the temperature of a 30g Fe cube from 40°C to 100°C .
Given,
Fe (iron) has a specific heat capacity
= c = 0.4490 J/g°C
mass of iron = m = 30g
initial temperature = T1 = 40°C
final temperature = T2 = 100°C
thus, temperature change = ∆T = (100-40 )°C= 60°C
According to the formula of heat energy(Q) ,
Q = mc∆T
Q = 30g × 0.449J/g°C × 60°C = 808.2 J
Hence, 808.2J heat energy needed to raise the temperature of a 30g Fe cube from 40°C to 100°C .
What is Specific heat capacity ?The amount of energy needed to raise a material's heat content by precisely 1°C per gramme is known as specific heat, or Csp.
mathematically,
c = Q /m×∆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
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what happens when the mass of an atom is different than the one on the periodic table.
Answer: They form molecules
Explanation:
Which of these forces are acting within a nucleus? Check all that apply
The forces that are acting within a nucleus is electrostatic forces of attraction.
What is electrostatic forces?Electrostatic forces can be described as the non-contact force and these forces can be seen as one that involves the pulling or pushing on objects without touching them.
It should be noted that the force can be generated through the activities that involves the Rubbing of some materials together and a a result of this the charge can be gotten.
In conclusion, the nucleus which can be described as the membrane-enclosed organelle that i been found in the cell of the organism that help to support live in the organism and it do contains the chromosomes, however in this nucleus the content is been held together as a result of the electrostatic forces of attraction and this attraction help the elements which are the biological element to function very well in the nucleus of the cell.
Therefore, second option is correct.
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Check the missing options:
strong nuclear force
electrostatic forces of attraction
electrostatic forces of repulsion
9. In what use-case would you choose to use a pure
metal over an alloy?
a.
b.
C.
d.
When making intricate jewelry.
When building a skyscraper
When making a baseball bat.
When making a kitchen knife.
Option C. When making intricate jewelry. we choose to use a pure
metal over an alloy.
Pure metals are those metals that have not been alloyed with other metal elements; commercially natural metals are 99% natural minimal. metalmen distribute a wide range of natural metals for all your software requirements.
An alloy is an aggregate of chemical elements of which as a minimum one is a steal. in contrast to chemical substances with metallic bases, an alloy will keep all of the residences of steel within the ensuing fabric.
Alloy steel is steel that includes about five% alloying factors in its composition. these alloying elements can encompass manganese, chromium, vanadium, nickel, and tungsten. The addition of alloying factors will increase basic machinability and corrosion resistance.
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About 33% of the hair's strength is due to the millions of what bonds in its
structure?
Hair is made of proteins called keratin. The protein structure includes ionic bonds, hydrogen bonds and disulfide bonds and these make the hair strong.
What is hair protein?Hair is made of a protein called keratin. Proteins are biomolecules made of large number of amino acids.
Proteins make the body strong since it plays an essential structural function. There are different types of proteins which are made of different number of amino acids and have different structures.
The bonds in proteins are mainly disulfide bonds, hydrogen bonds and ionic as well as covalent bonds. These bonds make the protein chain well adhered and strong.
In keratin protein, the structure is twisted and helical alpha structure with hydrogen bonds, ionic bonds and disulphide bonds which therefore, make the hair strong.
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Calculate the internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass = 176.124 g mol-1) if the combustion inside a bomb calorimeter, Ccal = 8.31 kJ °C-1, causes a temperature change from 21.5 °C to 68.3 °C.
The internal energy change, ΔrU, for the combustion of 29.3 g of vitamin C (C6H8O6, molar mass is given as
-2.33810^3 kJ/mal
This is further explained below.
What is internal energy change,?Generally, The total of heat transmitted and work performed represents the change in the internal energy of a system. The change in the system's internal energy plus the PV work completed equals the heat flow.
Given
Mass of Vitamin C=29.3g
Molar mass of Vitamin C=176.124g/mol
C cal =8.31 KJJ^0
[tex]\Delta T &=68.3-21.5[/tex]
=46.8^0
Bomb Calorimeter is a fixed volume, [tex]\Delta u=q+\omega=q[/tex]
hence, heat generated by a reaction, denoted by released, equals heat generated by a calorimeter, denoted by again.
qreleased=-gained
[tex]=-C_{\text {cal }} \Delta T \\[/tex]
Where
q= heat
T is temp
=-8.31* 468^o
=-388.908KJ
[tex]$\begin{aligned} \text { No. of moles of Vitamin } C &=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}} \\ &=0.1663 \mathrm{moles} \end{aligned}$[/tex]
No. of moles of Vitamin [tex]=\frac{29.3 \mathrm{~g}}{176.124 \mathrm{~g} / \mathrm{mol}}[/tex]
=0.1663moles
On combustion of 29* 3 =0.1663 moles of Vitamin C,
[tex]$\Delta u[/tex]=-388.908KJs
Therefore Permole of Vitamin C,
[tex]\Delta u=\frac{-388.908}{0.1663}[/tex]
=-2338.592
=-2.338 *10^3 KJ/mal
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Calculate the number of grams of solute in 1.000 L of 0.943 M potassium iodate
The number of grams of solute in 1.000 L of 0.943 M potassium iodate is 201.803g
0.943M means, 1L contains 0.943 moles KIO3.
Amount in g = no of moles× molar mass.
Molar mass of KIO3 = 214 g/mol.
So, mass of KIO3 present= 214×0.943 g = 201.803g
What are solute?A substance dissolved in a solution is called a solute. In liquid solutions, the amount of solvent is greater than the amount of solute. One of the best examples of a solute in our daily activities is salt and water. Salt dissolves in water and therefore salt is a solute.
The major types of solute are:
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Consider the reaction. 2Al(s)+Fe2O3(s)−→−heatAl2O3(s)+2Fe(l) If 20.4 kg Al reacts with an excess of Fe2O3, how many kilograms of Al2O3 will be produced?
Considering the reaction. 2Al(s)+Fe2O3(s)−→−heatAl2O3(s)+2Fe(l) the noles of Al₂O₃. will be produced 49.31 kilograms of Al₂O₃.
What is the chemical reaction?Generally, the equation for the chemical reaction is mathematically given as
[tex]$$2 \mathrm{Al}(\mathrm{s})+\mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s}) \rightarrow \text { heat }+\mathrm{Al}_2 \mathrm{O}_3(\mathrm{~s})+2 \mathrm{Fe} \text { (l) (1) }$$[/tex]
To find the mass of [tex]$\mathrm{Al}_2 \mathrm{O}_3$[/tex] produced, we need to find the number of moles of Al since it is the limiting reactant Fe_2 O_9 is in excess).
[tex]n_{A l}=\frac{m_{A l}}{A_{A i}} \quad \text { (2) }[/tex]
Where:
m_{{Al: }} is the mass of Al [tex]$=26.1 \mathrm{~kg}=26100 \mathrm{~g}$[/tex]
A_{A l} is the atomic mass of [tex]$\mathrm{Al}=26.982 \mathrm{~g} / \mathrm{mol}$[/tex]
The number of moles of Al
[tex]n_{A l}=\frac{m_{A l}}{A_{A l}}=\frac{26100 g}{26.982 g / m d i}=967.31$ moles[/tex]
Two moles of aluminum react with one mole of iron oxide to generate one mole of aluminum oxide (Al2O3), as shown in Equation (1).
[tex]$n_{\mathrm{Al}_2 \mathrm{O}_3}=\frac{1 \text { mol } \mathrm{Al}_2 \mathrm{O}_3}{2 \text { moles } \mathrm{Al}} * 967.31$ moles $\mathrm{Al}=483.66$ moles[/tex]
Finally, the mass of Al_2 O_3 in kilograms is:
[tex]m=n_{A l_2 \mathrm{O}_3} * M M \\\\=483.66 \mathrm{moles} * 101.96 \mathrm{~g} / \mathrm{mol} \\\\=49313.5 \mathrm{~g}\\\\=49.31 \mathrm{~kg}$$[/tex]
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When 38.0 mL of 0.1250 M H2SO4 is added to 100 mL of a solution of PbI2, a
precipitate of PbSO4 forms. The PbSO4 is then filtered from the solution, dried, and
weighed. If the recovered PbSO4 is found to have a mass of 0.0471 g, what was the
concentration of iodide ions in the original solution?
The concentration of the iodide ions is obtained as 4.75 * 10^-4 M.
What is the concentration of iodide ions in the original solution?We know that the concentration has to do with the amount of substance that is in the solution. In this case, we have been told that n 38.0 mL of 0.1250 M sulfuric acid is added to 100 mL of a solution of lead II iodide a lead II sulfate precipitate is formed and when filtered we obtain 0.0471 g of the filtrate and we want to find the concentration of the iodide ions in the original solution.
We must look to the balanced reaction equation as well as the stoichiometry of the reaction as we know it in this case.
Number of moles = volume * concentration of solution
Number of moles of sulfuric acid = 38/1000 L * 0.1250 M
= 4.75 * 10^-5 moles
Now we know that the reaction is 1:1 so;
Number of moles = volume * concentration of solution
concentration of solution = Number of moles/ volume
= 4.75 * 10^-5 moles/100 * 10^-3 L
= 4.75 * 10^-4 M
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Lesson 8 Chemical Compounds
Write an expository essay and explain the following essential content points.
*The difference between ionic, covalent, and metallic bonds
*how electrons are involved in each type of bond
The difference between ionic, covalent and metallic bonds are
Ionic bond is formed by the transfer of valence electron from one atom to another. It is also called as electrovalent bond. example given as follows
Na⁺ + Cl⁻ ----> NaCl
Covalent bond is formed when two atoms share their valence electron or we can say that by mutual sharing of one or more electrons between atoms.
H + H ----> H₂
Metallic bond is formed when collective sharing of valence electrons between several positively charged metal ions in metal lattice.
the images are attached at the end related to ionic bond , covalent bond and metallic bond.
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In the chemical equation Cu + 2AgNO3 = 2Ag +Cu(NO3)2, why is Cu(NO3)2 that and not CuNO3? Can Copper (i) Nitrate exist? Why or why not?
NO. One displacement reaction has occurred here. One element can substitute for another.
The majority of precipitates are created by twofold displacement processes, in which reactant ions swap locations to create new products, one of which will precipitate out of the solution.
What does displacement response refer to?A displacement reaction occurs when an atom or group of atoms in a molecule are replaced by another atom. For instance, when iron is introduced to a solution of copper sulphate, the copper metal is replaced. A-C-B = A + B-C. When A is more reactive than B, the preceding equation holds.
There are two displacement reactions as examples: iron sulphate is the result of the interaction between iron and copper sulphate. Iron replaces copper in this situation because it is more reactive than copper. the process by which zinc reacts with iron sulphate to produce zinc sulphate as a byproduct.
Displacement reactions come in two varieties: single displacement reactions and double displacement reactions.
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How many moles of each element are present in CH4?
To calculate the moles of each element in methane:
We will use the avogadros number.
For C:
1 mole = 6.022x10^23 atoms
in CH4 there is only 1 carbon.
Which is 1 x 6.022x10^23 atoms = 1 mole
There is 1 moles of carbon.
For H:
For hydrogen its 4 x 6.022x10^23 atoms = 4 moles
therefore there are 4 moles of hydrogen.
