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Unit 6: Balancing Equations and Simple Stoichiometry
6.06: Stoichiometry Practice Worksheet

This worksheet is worth 10 points. For problems 5-7 make sure to show your work using the factor-label method (Please circle or highlight your answers). Also, please round answers to the correct number of significant figures.

The four situations in which casting is the preferred fabrication technique. the correct option is (4), (6), (1) (2).

The four situations in which casting is the preferred fabrication technique are as follows :

1) For large pieces and/or complicated shapes.

2) when mechanical strength is not an important consideration.

3) For alloys having low ductility's.

4)  when it is the most economical fabrication technique.

The casting is the process in which the liquid is poured in to the mold and  then allowed to solidify. the fabrication is the process of the constructing the products by combining the parts using one or more individual process.

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Magma is frequently a mushy crystal mixture. Not all of a rock's components melt at the same time because various minerals have varying melting points. Magma is slushy as a result of this partial melting.

When atoms or molecules are tightly packed together to form a structure known as a crystal, a solid called a crystal is created through the complicated process of crystallization. Attributes of the emerging crystal depend heavily on parameters like temperature, atmospheric pressure, and within the case of liquid crystals, time of fluid evaporation. The chemical process of crystallisation is where the solid-liquid separation method takes place. A solute is mass transferred during this procedure from a pure solid crystalline phase to a liquid solution.

Crystallization takes place in two main stages.

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The atmosphere is where the majority of the nitrogen on earth is found. 78% nitrogen gas makes it available to living things (N2).

The chemical industry depends on nitrogen. It is employed to create explosives, nylon, nitric acid, fertilizers, and colors. Nitrogen must be combined with hydrogen to create ammonia in order to create these products.

Individuals are killed every year by breathing "air" with insufficient oxygen. Several people believe nitrogen gas is safe since it makes up 78 percent of a air we breathe. Only when nitrogen is combined with the right amount of oxygen is it safe to breathe, though.

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monohalogenated alkane is a haloalkane containing only one halogen atom - correct statement.

what is monohalogenated alkane ?

A halogenation reaction is a chemical reaction that takes place between a material and a halogen in which one or more halogen atoms are integrated into the substance's molecules.

When an alkane is halogenated, a hydrocarbon derivative is formed in which one or more halogen atoms are replaced for hydrogen atoms.

Because they are non-polar and lack functional groups where reactions might occur, alkanes are famously unreactive molecules. As a result, free radical halogenation provides a mechanism for functionalizing alkanes.

The amount of identical C-H bonds found in all but the simplest alkanes, however, is a significant constraint of radical halogenation, making selective reactions difficult to execute.

Monohalogenated alkane: An alkane substituted with one halogen atom instead of a hydrogen atom at any position in the compound. A monohalogenated alkane is a haloalkane containing only one halogen atom - correct statement. A monohalogenated alkane is a haloalkane containing several identical halogen atoms - incorrect statement.

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Prodrugs are designed to be initially inactive until further activated into the active form of the drug.

A prodrug is a chemical that is transformed before it has pharmacological effects. Or in other words, after you take a prodrug, it basically changes in your body before it starts working.

There are two major types of prodrugs. These categories are based on how prodrugs are  generally converted in the body:

1) Type I prodrugs turn into their active forms inside of cells.

2) Type II prodrugs turn into their active forms outside of cells, such as in blood or other fluids.

Before a prodrug can provide its intended effects in your body, it firsts needs to be broken down. A prodrug’s type affects how the medication is transformed or activated that is whether it occurs inside or outside your cells.

Different types of prodrugs can also impact the drug interactions. Certain interactions may prevent a prodrug from becoming active.

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The molecular mass of the given compound using the given mass of element is 40g/mol.

Given            Molar Mass

T                   10g/mol

P                    1 g/mol

L                    2g/mol

Molecular formula → T2P10L5

(i)The Molecular Mass of the given Molecule is: →

= (2x10 g/mol) + (10x1 g/mol) + (5×2g/mol)

= (2 + 10 + 10)g/mol

= 40g/mol

(ii) Mass percent of T = /[tex]\frac{Mass of T in comparing}{Molecular Mass of comperend} *100[/tex]

= 20/40 = 1/2 %The mass percent of T = 1/2 %

(iii) Mass percent of P = 10/40 = 1/4%

(iv) Mass percent of L = 10/40 = 1/4%

(V) When you add up Mass percents = 1/2 + 1/4 + 1/4 = 2+1+1/4 = 4/4 = 1.

The composition percentage indicates what types of atoms are present in the molecule and at what level. Percent composition also tells us about the various elements present in ionic compounds. The composition of a solution can be expressed in mass percent and indicates the mass of solute present in a given mass of solution.

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B) Respiratory rate, 16 breaths/min; tidal volume, 300 mL. Minute ventilation = tidal volume x respiratory rate (normal is 4-6 L/min).

According to Boyle's law, pressure falls as lung volume increases. Based on the pressure differential, the resulting sub-atmospheric intra-alveolar pressure then forces air into the alveoli. A tidal volume of roughly 500 mL is administered when the pressure has equalized.

The concept of dead space will be substantially simplified once the equation is understood. According to the formula, VD is equal to VT times the difference between arterial carbon dioxide partial pressure (PaCO2) and expired carbon dioxide partial pressure (PeCO2) divided by PaCO2.

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The comples has 6 ligands the geometry is Octahedral.

Octahedral is a geometric shape that has eight faces, each of which is an equilateral triangle. The shape has six vertices, and each vertex is connected to four other vertices, creating a three-dimensional structure. Octahedral shapes are commonly found in nature, but they can also be found in architecture and art. They are used as decoration on buildings and as part of sculptures. Octahedral shapes are often used to represent the elements in chemistry and can also be used to represent atoms and molecules. They are also used in mathematics, particularly in group theory, to represent the symmetries of an object.

The One of the Geometry can be Octahedral.

F-1: negative ligand

Central metal vanadium (V), with +3 oxidation state and complex have -3 change.

Based on this information we are going to find number of ligands (F-1)

[VFx]-3

Where,

-3 is the complex charge

V oxidation state is +3

x is the number of ligands.

So,

(+3) + x (-1) = -3

3 – x = 3

x = 6

This means this complex have 6 ligands.

Hence the complex is,

[VF6]-3

And if the comples has 6 ligands the geometry is Octahedral.

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A two-dimensional shape's area, which is expressed in square units, is the total surface area it can occupy. The square meter (m2), a derived measure, serves as the area unit in the SI system.

Why is it important to know which unit to use while measuring?

To make our judgment more trustworthy and accurate, we need a standard unit of measurement. Everyone should use the same measurement to ensure proper dealing. Therefore, measurements ought to be consistent. We require a consistent set of measurement units, also referred to as standard units, in order to maintain uniformity.

What three units of measurement are there?

The International System of Units (SI) units, the British Imperial System, and the US Customary System are the three common systems of measurement. The International System of Units (SI) units are the most widely used of these.

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Over the past 400,000 years. CH4 in the atmosphere is generally greatest when global temperature is greatest. The response is true.

The amount of methane in the atmosphere increased from 722 parts per billion (ppb) in pre-industrial times to 1895 ppb by 2021, a factor of 2.6 increase and the greatest level in at least 800,000 years.

Natural gas's primary component, methane (CH4), is a powerful greenhouse gas (GHG). When greenhouse gases escape into the atmosphere, they function as a blanket insulating the Earth, soaking up energy and reducing the speed at which heat escapes the globe. This energy is remarkably well absorbed in the case of methane.

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Reduction of fluid losses at the kidneys due to the retention of sodium is the action of reduction of fluid losses at the kidneys due to the retention of sodium is the action of aldosterone (option c).

The aldosterone chemical messenger is a hormone whose main function is to reduce the loss of fluid that may lead to dehydration which may be associated with unbalanced levels of sodium that is able to produce liquid retention in the urinary system.

This hormone aldosterone is well known to maintain suitable volumes of liquids, electrolytic homeostatic balance, as well as normal blood pressure conditions.

Therefore, with this data, we can see that the aldosterone chemical messenger is fundamental to controlling the levels of fluids by the urinary system as well as to maintaining suitable blood pressure levels.

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The pressure of the gas if it were behaving ideally is P = (3.220 moles × 8.314 J/mol × K × 298 K)/(8.325 L - 3.220 moles × b) - a(3.220 moles²)/(8.325 L²).

To use the van der Waals equation to determine the pressure of a gas if it were behaving ideally, you will need to first determine the value of the a and b parameters for the gas. These values are specific to each gas and can be found in a table or by using a calculator. Once you have the values of a and b, you can use the van der Waals equation to calculate the pressure:

P = (nRT)/(V-nb) - a(n²)/(V²)

where P is the pressure, n is the number of moles of the gas, R is the ideal gas constant, T is the temperature in kelvins, V is the volume of the container, and a and b are the van der Waals parameters for the gas.

Plugging in the given values, you can calculate the pressure of the gas if it were behaving ideally:

P = (3.220 moles × 8.314 J/mol × K × 298 K)/(8.325 L - 3.220 moles × b) - a(3.220 moles²)/(8.325 L²)

Note that you will need to determine the values of a and b for the gas in order to solve for the pressure.

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The half-reaction for the oxidation of tin can be written as: Sn -> SnO2 + 2e- the reduction that occurs in this reaction is the reverse of the oxidation half-reaction. It can be written as: SnO2 + 2e- -> Sn

In this reaction, tin is being oxidized to form tin dioxide. The half-reaction for the oxidation of tin can be written as:Sn -> SnO2 + 2e- This half-reaction shows that tin is losing two electrons to form tin dioxide. The half-reaction for the reduction that occurs in this reaction is the reverse of the oxidation half-reaction. It can be written as: SnO2 + 2e- -> Sn This half-reaction shows that tin dioxide is gaining two electrons to form tin. To balance the overall reaction, you can combine the two half-reactions by adding them together. The balanced overall reaction is: Sn + SnO2 -> SnO2 + Sn This reaction shows that tin is being oxidized to form tin dioxide, while tin dioxide is being reduced to form tin.

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The correct statement in regards to nuclear fusion are 1) Only in the sun's core does fusion take place because of the necessary temperatures.

2) The three types of neutrinos oscillate one after the other.

3) It takes very high temperatures for nuclei to merge.

The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in a fusion reaction. Because the mass of the resulting single nucleus is smaller than the combined mass of the two initial nuclei, the process produces energy. Remaining mass is converted to energy.

Controlled nuclear fission reactions and chemical reactions like burning coal, oil, or gas each produce roughly four million times as much energy as controlled atom fusion (at equal mass).

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the strongest intermolecular interactions between diethyl ether (ch3ch2och2ch3) molecules arise from Hydrogen bonding.

Interaction involving a hydrogen atom located between two other atoms with a close connection for electron density; one such bond is relatively weak than just an ionic bond or symbolizes but powerful than van der Waals forces. Since hydrogen is connected to a relatively electronegative atom, and this electronegative atom is a hydrogen donor, the hydrogen bond is the dominant type of bond between molecules. A hydrogen atom is smaller in size than other atoms and molecules. As a result, the resulting charge is more powerful.

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The number of moles of Cl₂ gas is equal to 1.83 mol in 130 g of chlorine gas.

A mole can be used to describe a standard unit that is utilized to determine a given count of particles. The particles that can be counted are chemically identical chemical entities, individually distinct.

A mole can be used to calculate quantities such as atoms, molecules, ions, or other particular particles.

Given, the mass of the chlorine gas = 130 g

The mass of one mole of chlorine gas = 71 g/mol

The number of moles of Cl₂ gas = Mass/ molar mass = 130/71 = 1.83 mol

Therefore, the number of moles of chlorine gas is 1.83 mol.

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The thing that is likely to accumulate in drusen is C. HDL.

Age-related macular degeneration is characterized by the drusen sign (ARMD). When yellow drusen are visible on color retinal photographs, it means that dry macular degeneration is still in its early stages (left). When the condition reaches the advanced stage (right), the macula's light-sensitive cells may disappear from the eye.

Drusen are tiny yellow deposits made up of fatty proteins (lipids), including HDL. These deposits build up between the bruch membrane and the retunal pigmented epithelium. The other options are incorrect because drusen do not accumulate cholesterol, mevalonate, or HMG-CoA Reductase.

The right choice is (c).

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Complete question

Age-related macular degeneration (ARMD) within the eye is a disease that is closely related to atherosclerosis. In ARMD, drusen are formed, which is similar to an atherosclerotic plaque, and ultimately vision is distorted. Given the close relationship between atherosclerosis and ARMD, what is likely to accumulate in drusen?

cholesterol

mevalonate

HDL

HMG- CoA Reductase

The oxidation number for iron is on the right side of the reaction arrow,

X = 2

Electron Transport Chain or Oxidative phosphorylation is a series of reductions and oxidation reactions to yield ATP, high energy molecules.

The enzyme, which plays a crucial role in creating proton gradient is ATP synthase. The conversion of ADP to ATP releases energy.

In the given chain, coenzyme Q couples with Cytochrome C for the conversion of ADP to ATP.

The species FADH₂ has oxidized and lost the protons to coenzyme Q. The FADH₂ will be converted to FAD.

FADH₂ + Q  FAD + QH₂

In the reaction, the enzyme has gained electrons, therefore undergone reduction.

As we know, cytochrome C is the iron-containing enzyme, which is represented as Fe ³⁺. It is present on the reactant side, such that:

The coefficient of Fe ³⁺ is 2. The reaction is given as now:

QH₂ + 2 cyt c (Fe ³⁺) - Q + 2 cyt c (Feˣ ) + 2H⁺

Charge present on the reactant side = 2 x 3 =+6

Also, the species on the product side and the reactant side should have an equal number of charges.

Now, following the law of conservation of mass:

QH₂ + 2 cyt c (Fe ³⁺) - Q + 2 cyt c (Feˣ ) + 2H⁺

From the law, the charge on the product side = Charge on the reactant side

2 x + (+2) = +6

x = 6 - 4

x = 2

Thus, the equation becomes:

QH₂ + 2 cyt c (Fe ³⁺) - Q + 2 cyt c (Fe²⁺ ) + 2H⁺

Therefore, the iron ions have a total of +4 charges and the +2 charges have been contributed by the hydrogen ions on the product side.

The stoichiometric coefficient determines the number of iron ions on the product side is 2, thus, the value of x = +2.

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The base protonation constant K_b of ammonia (NH_3) is 1.8 times 10^-5. the pH of a 0.43M solution of ammonia at 25 degree is 2.56.

pH = 1/2 (pkb-loge),pkb =-log (1-8x10¹³) 10= 4.74, Poh = (4.74-logo-43) = 2.56. The pH scale can be considered as a measure of free acidity. pH is defined more exactly as the deleterious record of the hydrogen ion concentration. A pH of 7 is considered neutral even though water has a pH of exactly 7. The pH value of water appears to indicate how acidic or basic

pHs or less 7 indicate acidity, while pHs greater than seven indicate baseness. The pH of water is a measure of the amount of free hydrogen and hydroxyl ions. The pH of a solution is an essential parameter that takes into account its chemical conditions.

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If Iron(III) oxide reacts with nitric acid to produce iron(III) nitrate and water. when 87.3 g of iron(III) oxide reacts with 126.5 g of nitric acid to produce 140.1 g of iron(III) nitrate. The percent yield of the reaction should be 82.5 %.

The balanced reaction is :

Fe₂O₃ + 6HNO₃ → 2Fe(NO₃)₃ + 3H₂O

Moles of Fe₂O₃ taken = (87.3 g) / (160 g/mol)

                                    = 0.545 mol

Moles of HNO₃ taken = (126.5 g) / (63.0 g/mol)

                                    = 2.01 mol

 0.545 mol Fe₂O₃ → 6 × 0.545 mol HNO₃

                          = 3.27 mol HNO₃

But we have only 2.01 mol HNO₃, so HNO₃ is the limiting reagent.

Theoretical moles of Fe(NO₃)₃ formed = [tex]\frac{2}{6}[/tex] × 2.01 mol

                                                          = 0.67 mol

Theoretical yield of Fe(NO₃)₃ = 0.67 mol × 242 g/mol

                                                 = 162.1 g

Percentage yield = (Actual yield / Theoretical yield) × 100

                             = [tex]\frac{133.7 g}{162.1 g}[/tex] × 100

                             = 82.5 %

So, the percentage yield of the reaction is 82.5 %.

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The statement "An example of measurement replication would be measuring the temperature of boiling water at home and measuring the temperature of boiling water in Martin Hall" is a TRUE statement.

Measurement replication is the ability to replicate a recorded measurement using the same measurement parameters or rules, the same research designs, and using the original sample of the same population. It's an important aspect of study research, both in qualitative and quantitative studies.

The example in the statement above is a measurement replication. Assuming that the researcher is using the overall same source of water (or both home and Martin Hall are in the same place/town), then it's an act of measurement replication in different places and should yield the overall same result.

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The standard enthalpy of formation of CO (g) is -114.15 kJ/mol (approx)

In thermodynamics, the standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.

S(s,rhombic) + 2CO (g) ===>>SO2(g) + 2 C (s,graphite)

The standard enthalpy change of the Reaction is given by:

ΔH°rxn = nΣ ΔHf°(products) - nΣ ΔHf° (reactants)

=> ΔHf°rxn = [1mole* ΔHf°SO2(g) + 2mole* ΔHf°C(s,graphite)] - [1mole * ΔHf°S(s, rhombic) + 2mole * ΔHf°CO(g) ]

=> -67.8 kJ = [1mole * (-296.1kJ/mol) + 2mole *( 0kJ/mol)] - [1mole* (0 kJ/mol) + 2mole * ΔHf°CO(g) ]

=> -67.8 kJ = -296.1 kJ - [ 2 mole * ΔHf° CO(g) ]

=> -67.8 kJ + 296.1 kJ = - 2 mole * ΔHf°CO(g)

=> 228.3 kJ = -2 mole * ΔHf°CO(g)

=>ΔHf° CO(g) = -114.15 kJ/mol

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The specific heat capacity of the material is obtained as 0.15 J/g°C.

We know that the term specific heat capacity has to do with the heat that is able to cause the temperature of 1 Kg of a material to rise by 1K. We know that there are some materials that are able to rise in temperature much more than other substances when they are heated.

We are told that the heat that is absorbed by the material is 143 cal or 598 J

Thus;

H = mcdT

m = mass of the object

c = specific heat capacity of the material

dT = temperature change

Then;

598 = 111.4 * c * (65.6 -  29.5)

c = 598/111.4 * (65.6 -  29.5)

c = 0.15 J/g°C

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Two chiral C atoms make up L-ascorbic acid. In the image, they are indicated with an asterisk.

1st structure: Top chirality center:0

Other chirality center:0

2nd structure: Top chirality center: R

Other chirality center: S

What are chiral centers and chirality?

Chiral centre: A chiral centre is an atom that has four distinct groups linked to it in a way that prevents a superimposable mirror image.

Chirality: Chirality is the quality of objects that prevents them from being superimposed on their mirror images.

A set of hands is an illustration of chirality.

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One of the major difference between Lithium and Magnesium is that Lithium is more metallic in nature than Magnesium. and also Magnesium is determined to be a more reducible metal than “lithium”.

Lithium ions were discovered to be attracted to ATP-magnesium to form an ATP-magnesium-lithium complex at concentrations corresponding to typical dose levels. According to the researchers, this compound may have an impact on how ATP works in the brain and other parts of the body.

Magnesium and lithium are both metals with a diagonal connection and are classified in separate metallic classes.

To ensure you are taking the proper dosage of lithium and to monitor your blood levels on a regular basis. They will first be examined every week or two weeks.

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The diagram shows half of the atoms shifted downwards; positive ions are next to positive ions and negative ions are next to negative ions. The correct option to this question is A.

Hard crystals of ions exist. They melt at a high temperature. Ions are arranged in a specific way within the crystal lattice of ionic crystals. Ionic crystals can transport ions in a molten state. Ionic crystals function well as an electrical conductor when they are in a molten state.

The simplest collision displacements are the most direct means of ion displacement in an ionic lattice when the lattice is exposed to ionizing radiation. As a result, it is reasonable to expect that high-energy electrons will cause displacements by a straightforward "billiard-ball" collision; conversely, -rays may cause displacements by Compton scattering, either directly by the ions recoiling or by the production of high-energy electrons that will then collide with and displace ions.

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The pH of the solution can be obtained as 8.8.

We know that the pH tells us the amount of the hydrogen ions that we can be able to find in the solution. We now have the following that can be obtained from the reaction.

Number of moles of the NaOH = 30/1000 * 0.4

= 0.012 moles

Number of moles of HF = 25/1000 * 0.48

= 0.012 moles

Total volume present = 25 mL + 30 mL = 55 mL or 0.055 L

Molarity of NaF = 0.012 moles/0.055 L

= 0.22 M

Kb = 1 * 10^-14/Ka

Kb =  1 * 10^-14/ 6.76×10^−4

Kb = 1.5 * 10^-10

Then we have;

Kb = [HF][OH-] / [F-]

= (x)(x) / 0.22

1.5 * 10^-10 = x^2/0.22

x =  1.5 * 10^-10 * 0.22

x = √ 1.5 * 10^-10 * 0.22

x = 5.7 * 10^-6 M

pOH = - log( 5.7 * 10^-6 )

= 5.2

pH = 14 - 5.2

= 8.8

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KBr

Explanation:

lmk if ya need explanation

Answer: KBr

Explanation:

In an ionic compound, the positively charged ions (cations) are written first, followed by the negatively charged ions (anions). The formula for an ionic compound is written using the symbols for the elements involved and the correct subscripts to indicate the ratio of ions in the compound.

In this case, the potassium ion is K+, and the bromine ion is Br-. The potassium ion has a charge of +1, and the bromine ion has a charge of -1. To balance the charges, the formula for the compound must include one potassium ion and one bromine ion. Therefore, the formula for the compound is KBr.

Note that this is the empirical formula for the compound, which represents the simplest whole-number ratio of atoms in the compound. The molecular formula, which represents the actual number of atoms in the molecule, may be different.

Example of rock weathering can be categorized as either physical weathering or chemical weathering, categorized are shown below:

The breakdown or dissolution of rocks and minerals on the surface of the Earth is known as weathering. Once a rock has been disintegrated, the minerals and rock fragments are carried away by a process known as erosion. Weathering and erosion are caused by water, acids, salt, plants, animals, and temperature changes.

Because it breaks down rocks and minerals, weathering is a crucial process that aids in the formation of soil. Plants require soil to flourish in order to give animals and people food and oxygen. Land forms including mountains, valleys, canyons, and plateaus are also produced through weathering.

Physical Weathering:

Chemical Weathering:

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The complete question is as follows:

Each example of rock weathering can be categorized as either physical weathering or chemical weathering. drag each item to the correct location.

Answer:

C2= 0.126M

Explanation:

C1*V1=C2*V2

C1= 0.630M

C2=?

V1= 100.0ML

V2= 500.0ML

0.630*100 = C2*500

C2= 0.630*100÷500

C2= 63÷500

C2= 0.126M