CAN SOMEONE HELP WITH THIS QUESTION?✨

The balanced chemical equation for the given reaction is given as,

Fe₂S₃ + 6HCl → 2FeCl₃ + 3H₂S

A balanced chemical equation is defined as an equation where the number of atoms of each type in the reaction is the same on both reactants and product sides. Generally, the mass, as well as the change, are equal in a balanced chemical equation.

Basically chemical equation is said to be unbalanced if the number of atoms of each element on the left-hand side is not equal to the number of atoms present on the right-hand side. The balanced chemical equation remains always in accordance with the Law of Conservation of Mass.

The coefficient of the HCl is 6.

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The number of moles is 0.06 moles while the mass is 6.66 g

The mole is a unit of measurement used in chemistry to express amounts of a substance. One mole of a substance is defined as the amount of that substance that contains as many entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12, which is a common isotope of carbon.

Number of moles = 1.2 * 0.05

= 0.06 moles

Mass of the CaCl2 =  0.06 moles * 111 g

= 6.66 g

The mole is used to make it easier to compare the amounts of different substances in chemical reactions, and to calculate the amounts of reactants needed to produce a certain amount of product.

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Answer:

Mg3N2

Explanation:

When LiCl dissolves in water, the Li+ and Cl- ions become hydrated by water molecules, and these hydration interactions are the main contributors to the dissolution process being exothermic.

Specifically, the exothermicity arises due to the attractive electrostatic interactions between the ions and water molecules, which release energy as heat when the ions become surrounded by the solvent molecules.

In addition, the water molecules also form hydrogen bonds with each other and with the ions, further stabilizing the hydrated complex and contributing to the overall exothermicity of the process.

Therefore, the dissolution of LiCl in water is exothermic due to the particle-particle interactions between the ions and water molecules, including electrostatic interactions and hydrogen bonding.

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A)17,300 L liters of CH3OH (FM 32.04, density = 0.791 g/mL) are required by Reaction 1 for 2.9 million liters of aquarium water.

B)192L liters of CH3OH are required by the net reaction for 2.9 million liters of aquarium water with a nitrate concentration of 8 100 uM.

C)The total volume of methanol required to denitrify 2.9 million liters of aquarium water is 22,496 L.

(a) To calculate the amount of CH3OH required for Reaction 1, we need to first determine the amount of O2 in 2.9 million liters of aquarium water.

Concentration of O2 in seawater = 220 mM

Volume of aquarium water = 2.9 million L

Amount of O2 in aquarium water = concentration x volume = 220 mM x 2.9 million L = 6.38 x 10^8 mmol

From the balanced chemical equation for Reaction 1, we see that 3 moles of O2 react with 2 moles of CH3OH. Therefore, the number of moles of CH3OH required is:

(2/3) x (6.38 x 10^8 mmol O2) = 4.25 x 10^8 mmol CH3OH

To convert this to volume, we need to use the density of CH3OH:

density = 0.791 g/mL

molar mass of CH3OH = 32.04 g/mol

volume of CH3OH = (4.25 x 10^8 mmol) x (32.04 g/mol) / (0.791 g/mL) = 1.73 x 10^7 mL = 17,300 L

(b) The net reaction for denitrification is:

5NO3- + CH3OH + 4H+ → N2 + 3CO2 + 7H2O

From the balanced chemical equation, we see that 1 mole of CH3OH is required for every 5 moles of NO3-. The concentration of nitrate in the aquarium water is 8,100 uM, which is equivalent to 8.1 mM.

Number of moles of nitrate in aquarium water = concentration x volume = 8.1 mM x 2.9 million L = 2.35 x 10^7 mmol

Number of moles of CH3OH required = (1/5) x (2.35 x 10^7 mmol) = 4.7 x 10^6 mmol

To convert this to volume, we use the same calculation as in part (a):

volume of CH3OH = (4.7 x 10^6 mmol) x (32.04 g/mol) / (0.791 g/mL) = 1.92 x 10^5 mL = 192 L

(c) The bacteria require 30% more methanol for their own growth, which means we need to add an additional 30% of the methanol required for Reactions 1-3.

Total volume of methanol required = volume from part (a) + volume from part (b) + 0.3 x (volume from part (b))

Total volume of methanol required = 17,300 L + 192 L + 0.3 x 192 L = 22,496 L

Therefore, the total volume of methanol required to denitrify 2.9 million liters of aquarium water is 22,496 L.

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The percent error to 2 significant figures is 11%.

What is Titration?

Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a standard solution of known concentration. The process involves adding the standard solution to the solution of unknown concentration until the reaction is complete, at which point the amount of standard solution needed to reach the endpoint is used to calculate the concentration of the unknown solution.

The relationship between pKa and Ka is given by:

pKa = -log(Ka)

Rearranging this equation, we get:

Ka = 10^(-pKa)

Substituting the given value of pKa = 4.06, we get:

Ka = 10^(-4.06) = 7.01 x 10^(-5)

The experimental Ka for benzoic acid is 7.01 x 10^(-5).

To calculate the percent error, we use the formula:

percent error = (|experimental value - accepted value| / accepted value) x 100%

Substituting the given values, we get:

percent error = (|7.01 x 10^(-5) - 6.3 x 10^(-5)| / 6.3 x 10^(-5)) x 100%

percent error = 11.19%

The percent error to 2 significant figures is 11%.

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In compounds, nitrogen and phosphorus frequently form covalent bonds to produce bonds. The valence electrons on nitrogen and phosphorus atoms determine how many total covalent bonds they typically form. While phosphorus can make three or five covalent bonds, nitrogen normally only forms three.

Nitrogen (N), a nonmetallic element belonging to Periodic Table Group 15 [Va]. It is a colorless, flavorless, and odorless gas that makes up the majority of the atmosphere on Earth and is a component of all living things. Nitrogen is a chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest element in the pnictogens, group 15 of the periodic table. It is a common element in the universe and is thought to be the eighth most abundant element overall in the Milky Way and the Solar System.

The primary source of nitrogen for atmospheric deposition is the combustion on fossil fuels like coal and oil. Nitrogen may be deposited in the atmosphere as dry particulates, gases, or droplets or as a wet form such as rainfall, snow, hail, fog, or freezing rain. Nitrogen primarily comes from the atmosphere. It is made comprised of this harmless, colorless gas in 78 percent of its composition.

N2: triple bond; three covalent bonds are being formed by nitrogen.

NH3: three single bonds, three covalent bonds being formed by nitrogen.

NH2Cl: nitrogen is making three covalent bonds, two of which are single bonds and one is a double bond.

NO: Nitrogen is making two covalent bonds, one single bond and one double bond.

HNO: nitrogen is making two covalent bonds, one single and one double.

HCN: three covalent bonds are being formed by nitrogen, including one single bond and one triple bond.

HPS: phosphorus is making three covalent bonds, one single bond, two double bonds, and one single bond.

PH3: phosphorus is creating three covalent bonds from three single bonds.

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The mass of chromium in 100 g of the first sample is 17.82 g. Then, the mass of bromine in 100 g of the sample is 82.18 g. Therefore, there will be 0.21 g per 1 g of bromine.

The mass percent of an element or group in a mixture or compound is the indicating how much gram of the element is present in 100 g of the sample.

Thus it is the ratio of its mass to the total mass of the sample multiplied by 100.

Given that the first sample of chromium bromide contains 17.82% of chromium. Hence, 17.82 g of Cr is present in 100 g of the sample.

Then, mass percent of Br = 100 - 17.82 g = 82.18 g.

Thus, for 82.18 g of Br, there is 17.82 g of Cr.

Then, for 1 g of Br:

17.82/82.18 = 0.216 g of Cr is present.

Therefore, mass of chromium per 1 g of bromide is 021 g.

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Answer:

8?

Explanation:

molar mass of KNO3 = 39.1 g/mol (K) + 14.0 g/mol (N) + 3x16.0 g/mol (O)

                                  = 101.1 g/mol

moles of KNO3 = 70.5 g / 101.1 g/mol

                          = 0.697 mol

mass of solution = mass of KNO3 + mass of water

                            = 70.5 g + (1.97 L x 1.05 g/mL)

                              = 70.5 g + 2.067 g = 72.567 g

volume of solution = 72.567 g / 1.05 g/mL

                               = 69.105 L

Molarity = 0.697 mol / 69.105 L

             = 0.0101 M

mass of solvent = mass of solution - mass of solute = 72.567 g - 70.5 g

                              = 2.067 g

mass of solvent = 2.067 g / 1000 g/kg

                           = 0.002067 kg

Molality = 0.697 mol / 0.002067 kg

                = 337.2 mol/kg

Mass percent = (70.5 g / 72.567 g) x 100%

                        = 97.16%

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Identifying the molecule with the most intense C-C signal in an IR spectrum in the following manner.

Infrared spectroscopy (IR) detects the vibrations of covalent bonds in a molecule. The C-C bond typically absorbs in the mid-infrared (MIR) region, between 1200-800 cm^-1. The intensity of the C-C signal depends on the strength of the bond, the symmetry of the molecule, and the number of C-C bonds present.

Changing Ha and Hb to Br: This substitution will not necessarily increase the strength of the C-C bond or the number of C-C bonds, and may not affect the symmetry of the molecule. Therefore, this change is unlikely to produce a molecule with the most intense C-C signal.

Changing Ha to F and Hc to Br: This substitution will create a fluorine atom on one of the carbons and a bromine atom on another carbon. The electronegativity of fluorine is greater than that of carbon, which may result in a stronger C-C bond. Additionally, the molecule will have two different halogen atoms, which could increase the intensity of the signal due to increased symmetry. Therefore, this change could potentially create a molecule with a more intense C-C signal.

Changing Ha to F and Hd to Br: Similar to the above, this substitution will create a fluorine atom on one of the carbons and a bromine atom on another carbon. The molecule will also have two different halogen atoms, which could increase the symmetry of the molecule and the intensity of the signal. Therefore, this change could potentially create a molecule with a more intense C-C signal.

Changing Ha to F: This substitution will not necessarily increase the strength of the C-C bond or the number of C-C bonds, and may not affect the symmetry of the molecule. Therefore, this change is unlikely to produce a molecule with the most intense C-C signal.

Changing Ha to F and Hb to Br: This substitution will create a fluorine atom on one of the carbons and a bromine atom on another carbon. The molecule will have two different halogen atoms, which could increase the symmetry of the molecule and the intensity of the signal. However, it may not necessarily increase the strength of the C-C bond or the number of C-C bonds. Therefore, this change is less likely to create a molecule with the most intense C-C signal compared to the previous two changes.

Overall, changing Ha to F and Hc or Hd to Br may potentially create a molecule with the most intense C-C signal in an IR spectrum. However, it's important to note that other factors could also impact the intensity of the signal, and that the specific molecule in question needs to be examined to make an accurate prediction.

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36.47% of the mass of iron (II) sulfide is sulfur. If 87.91 g of iron sulfide is produced by reacting iron with sulfur, the amount of iron that was reacted is 87.91 g Fe(II) sulfur multiplied by 63.53% Fe (II) equals 55.85 g Fe (II)

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The final product is 1-butanol.

The given reaction is the addition of a Grignard reagent, CH₃CH₂MgBr, to a carbonyl compound.

The mechanism for the reaction is a nucleophilic addition. The mechanism can be broken down into three main steps:

Step 1: Nucleophilic attack

The carbon atom in the carbonyl group has a partial positive charge, making it an electrophile. The carbon atom in the Grignard reagent has a partial negative charge, making it a nucleophile. The nucleophilic carbon attacks the electrophilic carbon of the carbonyl group, forming a tetrahedral intermediate.

             H

             |

  H₃C     C      O

             |

             CH₃

               -

               |

        CH₃CH₂MgBr

Step 2: Protonation

The tetrahedral intermediate is unstable and collapses. In this step, an acid, such as H₃O⁺, protonates the oxygen atom, which forms an alcohol.

             H

             |

  H₃C     C      OH

             |

             CH₃

               -

               |

        CH3CH2MgBr + H3O+

Step 3: Deprotonation

In the final step, a base, such as water, removes a proton from the protonated alcohol to form the final product, which is a neutral alcohol.

             H

             |

  H₃C     C      OH

             |

             CH₃

                  |

                  H

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For principal quantum number n = 1, l = 0 and m = 0.

For n = 2, l= 0, 1 and m = -1,0,1.

For n = 3, l = 0,1,2 and m = -2,-1,0,1,2

The magnetic quantum number (m) is one of the four quantum numbers used to describe the unique state of an electron in an atom. It goes from -l to +l.

a. For n=1 and l=0, the only allowable magnetic quantum number is 0.

b. For n=2 and l=0, the only allowable magnetic quantum number is 0.

c. For n=2 and l=1, the allowable magnetic quantum numbers are -1, 0, and 1.

d. For n=3 and l=0, the only allowable magnetic quantum number is 0.

e. For n=3 and l=1, the allowable magnetic quantum numbers are -1, 0, and 1.

f. For n=3 and l=2, the allowable magnetic quantum numbers are -2, -1, 0, 1, and 2.

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--The complete question is, Enter all allowable magnetic quantum numbers for each of the principal and angular momentum quantum number combinations given below.

a. n= 1, l =0

b. n =2 , l = 0

c. n =2, l =1

d. n =3, l =0

e. n =3, l =1

f. n =3, l =2--

The products of the reaction are  PbSO4(s) + KNO3(aq)

A precipitate is a solid that forms and separates out of a solution as the result of a chemical reaction. Precipitation reactions occur when two solutions containing ions are mixed together and the resulting mixture is no longer able to hold the ions in solution, causing them to form an insoluble solid.

In order to predict whether a precipitate will form or not, the solubility rules can be used to determine if a compound is soluble or insoluble in a particular solution. If the resulting compound is insoluble, a precipitate will form.

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Answer:

(a) The electron configuration 1s22s32p3 is not possible because it violates the Pauli exclusion principle, which states that no two electrons in an atom can have the same set of four quantum numbers. The 2p sublevel can hold a maximum of six electrons, with two electrons in each of the three orbitals. Therefore, the 2p sublevel cannot accommodate five electrons as in the given configuration.

(b) The electron configuration 1s22s22p33s6 is not possible because it violates the Aufbau principle, which states that electrons fill orbitals in order of increasing energy, starting from the lowest energy level. The 3s sublevel has a lower energy than the 3p sublevel, so it should be filled before the 3p sublevel. Therefore, the configuration should be 1s22s22p63s2 instead.

(c) The electron configuration 1s22s22p73s23p8 is not possible because it violates the Pauli exclusion principle. The 3p sublevel can hold a maximum of six electrons, with two electrons in each of the three orbitals. Therefore, the 3p sublevel cannot accommodate eight electrons as in the given configuration.

(d) The electron configuration 1s22s22p63s23p14s23d14 is not possible because it violates the Hund's rule, which states that electrons fill orbitals of the same energy level singly, with parallel spins, before they pair up. In the 3d sublevel, the five d orbitals are degenerate (have the same energy). Therefore, the electrons should first fill each of the five d orbitals singly, before pairing up. The correct configuration for this atom should be 1s22s22p63s23p63d54s2 instead.

Explanation:

The ground state electron configuration of an atom is the arrangement of electrons in the lowest energy levels available, according to the rules of the Aufbau principle, Pauli exclusion principle, and Hund's rule.

(a) The electron configuration 1s22s32p3 is not possible because it violates the Pauli exclusion principle, which states that no two electrons in an atom can have the same set of four quantum numbers. The 2p sublevel can hold a maximum of six electrons, with two electrons in each of the three orbitals. Therefore, the 2p sublevel cannot accommodate five electrons as in the given configuration.

(b) The electron configuration 1s22s22p33s6 is not possible because it violates the Aufbau principle, which states that electrons fill orbitals in order of increasing energy, starting from the lowest energy level. The 3s sublevel has a lower energy than the 3p sublevel, so it should be filled before the 3p sublevel. Therefore, the configuration should be 1s22s22p63s2 instead.

(c) The electron configuration 1s22s22p73s23p8 is not possible because it violates the Pauli exclusion principle. The 3p sublevel can hold a maximum of six electrons, with two electrons in each of the three orbitals. Therefore, the 3p sublevel cannot accommodate eight electrons as in the given configuration.

(d) The electron configuration 1s22s22p63s23p14s23d14 is not possible because it violates the Hund's rule, which states that electrons fill orbitals of the same energy level singly, with parallel spins, before they pair up. In the 3d sublevel, the five d orbitals are degenerate (have the same energy). Therefore, the electrons should first fill each of the five d orbitals singly, before pairing up. The correct configuration for this atom should be 1s22s22p63s23p63d54s2 instead.

54.58g of Medicine would be usual dose for a 18 month old weighing 19 pounds.

Here, given that usual dose  for children of use between 6 month to 2 year  fever, is 5 mg per kg body weight.

1 kg body weight require 5 mg dose of medicine. and are have to find out how much dose of medicine

Required for 18 month children whose weighing is 24 pounds.

So, first are convert all the data in milligram because answer is required in mg. we know that

1 pound = 0.454K2

1 kg= 100 mg

.: 24 pounds = 24X0. 454 x 100 mg

[ 1 pound = 0.454 K2 then 24 pound = 24×0.454k2. and 24x0.454g = 24×0.454 × 100 mg

Now, 10 mg body weight remise dose is 5 mg then 24x054xlos my body.

required dose of children of 18 month and weighing is 24X0.454x100 mg is = 24x0.454x100 x 5 106 = 54.48 mg.

Answer: 54.48 mg.

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bonds are the only primary bonds that are directionally dependent. Materials whose constituent particles are bound by bonding are generally expected to have the lowest melting temperatures

The correct options to fill in the blanks are is a)covalent bond.

• Bonding is similar to covalent bonding, except there are no high-electronegativity atoms present to accept any electrons that the present atoms are willing to donate.

• Covalent bonds are responsible for binding atoms together within a molecule of propane, whereas van der Waals bonds bind separate propane molecules together in a condensed state (liquid or crystal).

• Covalent bonds are the only primary bonds that are directionally dependent.

• Materials whose constituent particles are bound by metallic bonding are generally expected to have the lowest melting temperatures.

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The diagram B  represents electromagnetic energy with the longest wavelength.

What is wavelength ?

The Greek letter lambda (λ), which represents wavelength, is frequently used. When describing modulated waves, their sinusoidal envelopes, or waves created by the interference of several sinusoids, the term wavelength is also occasionally used.

What is electromagnetic energy ?

Radiant energy called electromagnetic energy moves in waves at the speed of light. It can also be referred to as radiant energy, light, electromagnetic waves, electromagnetic radiation, or the motion of electromagnetic waves. Heat can be transferred through electromagnetic radiation.

Therefore, The diagram B  represents electromagnetic energy with the longest wavelength.

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All the compounds given are soluble in water. The compounds that behave as nonelectrolyte(s) in solution are glucose and glycerol.

Nonelectrolytes are compounds that do not dissociate into ions in water and therefore do not conduct electricity.

Glucose (I) and glycerol (III) are both examples of nonelectrolytes. They are soluble in water but do not dissociate into ions, so they do not conduct electricity.

Potassium nitrate (II), acetic acid (IV), and ammonium carbonate (V) are all electrolytes, meaning they dissociate into ions in water and conduct electricity.

Therefore, the compounds that would behave as nonelectrolytes in solution are glucose (I) and glycerol (III) and all the given compounds are soluble in water.

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The biodegradation reaction rate coefficient (d-1) must be achieved  for the required concentration of exit stream is 0.003456 /day.

The term biodegradation is defined as the degradation of the materials into environmentally acceptable products such as water, carbon dioxide, and biomass by the action of naturally available microorganisms under normal environmental conditions.

Suppose C₀ represent the initial concentration of the biodegradable organic material = 100 g/L = 100 g/m³

Then,C be the concentration of biodegradable organic material that leaves the lagoon = 20 mg/L = 20 g/m³

Now, the rate constant be k

Let V be the volume of the lagoon

= 10 hectares × 1 m

= 100000 × 1

= 100000 m³

F₀ be the flow rate of in fluent into the first lagoon = 8640 m³/day

(kC₀V/F₀) = (C₀ - C)/C

(k×100×100000/8640)

= (100-20)/20

k = (4×8640)/(100×100000)

= 0.003456 /day

Thus, The biodegradation reaction rate coefficient (d-1) must be achieved  for the required concentration of exit stream is 0.003456 /day.

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The rate law expression for the destruction of O3 based on the proposed two-step mechanism is: rate = k[O3][NO]

This expression is derived from the proposed mechanism by identifying the rate-determining step (the slow step) and using the concentrations of the reactants involved in that step.

In this case, the slow step is the reaction between O3 and NO to form NO2 and O2. Therefore, the rate law expression is based on the concentrations of O3 and NO, and the rate constant k.

It is important to note that the rate law expression does not include the concentrations of the other reactants or products involved in the mechanism, as they are not involved in the rate-determining step.

Overall, the rate law expression for the destruction of O3 in the upper atmosphere based on the proposed two-step mechanism is rate = k[O3][NO].

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The birth outcomes are possible as a result of prenatal exposure to airborne polycyclic aromatic hydrocarbons is the correct option is e) All of the above.

The birth outcomes that are possible as the  result of the  prenatal exposure to the  airborne polycyclic aromatic hydrocarbons are :

a) Reduced birth length

b) Reduced birth weight

c) Smaller head circumference

d) Shortened gestation

The Prenatal exposure to the PAHs has been connected with the  ADHD that is the  symptoms of the anxiety, the depression and the inattention, and also the behavioral disorders, that are all thought to the related to the deficits in the self - regulation.

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This question is incomplete, the complete question is :

which of the following birth outcomes are possible as a result of prenatal exposure to airborne polycyclic aromatic hydrocarbons (PAHs)? select all that are true.

a) Reduced birth length

b) Reduced birth weight

c) Smaller head circumference

d) Shortened gestation

e) All of the above

The symmetry operations are, E (identity operation), C2 (rotation by 180 degrees about the carbon-carbon double bond), C2' (rotation by 180 degrees about the axis passing through both chlorine atoms), sigma_v (reflection through a plane perpendicular to the carbon-carbon double bond), sigma_v' (reflection through a plane perpendicular to the axis passing through both chlorine atoms), i (inversion through a point at the midpoint of the carbon-carbon double bond).

The molecule 1,3-dichloropropadiene has the chemical formula C3H2Cl2.

There are four atoms in the molecule, and each atom has a set of valence electrons that can be used to form chemical bonds. We can identify two C2 axes that pass through the carbon-carbon double bond, and one C2 axis that passes through both chlorine atoms. There are also two perpendicular planes of symmetry that bisect the molecule, one containing the carbon-carbon double bond and the other containing the two chlorine atoms.

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Answer:

The balanced equation is

2NaCl + F2 ---> 2NaF + Cl2

A hydrate of sodium carbonate, Na[tex]_2[/tex]CO[tex]_3[/tex] has a mass of 4.31 g before heating. After heating, the mass of the anhydrous compound is found to be 3.22 g.  Therefore, The mass of water in the original sample is 1.09g.

Sodium carbonate is an inorganic compound with the formula Na[tex]_2[/tex]CO[tex]_3[/tex], where x may range from 0 and 10. All forms are water-soluble, white, unscented salts that generate alkaline water solutions. It was historically made first from ash of plants grown in sodium-rich soil.

Before heating, a hydrates of sodium carbonate, Na[tex]_2[/tex]CO[tex]_3[/tex], does have a mass of 4.31 g. The weight of the anhydrous salt after heating is determined to be 3.22 g. The original sample contains 4.31-3.22 =1.09g of water.

Therefore, the mass of water in the original sample is 1.09g.

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Both staining methods rely on heat and the use of different types of stains to differentiate between different structures within bacterial cells.

The Ziehl-Neelsen acid-fast staining method and the Schaeffer-Fulton endospore staining method are both types of differential staining methods used in microbiology. They are used to identify specific structures or components within bacterial cells.

One thing that the two staining methods have in common is that they both involve heat in the staining process. The Ziehl-Neelsen acid-fast staining method involves heating the slide containing the bacterial sample with a solution of carbol fuchsin, which helps to penetrate the waxy cell wall of acid-fast bacteria.

Both staining methods also involve the use of different types of stains to selectively color different structures within bacterial cells. In the Ziehl-Neelsen acid-fast staining method, acid-fast bacteria retain the carbol fuchsin stain, while non-acid-fast bacteria are decolorized and counterstained with a contrasting color.

In the Schaeffer-Fulton endospore staining method, endospores are stained with a primary stain (malachite green), and then counterstained with a contrasting color (safranin).

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The statement that best explains why the chemical equation provided for combustion of methane supports law of conservation of mass is as follows: There is same number of each kind of atom before and after the chemical reaction and the total mass remains the same (option D).

The law of conservation of mass is a conservation law that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

The law of conservation of mass further explains that in a chemical reaction, the amount of each atom on both sides of the equation is the same.

According to this question, methane gets combusted in air. To fulfill the law of conservation of mass, the same number of each kind of atom before and after the chemical reaction and the total mass remains the same.

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Answer:

B. Cornstarch

Explanation:

Iodine reacts with some substances and changes color as a result of the reaction. Out of the items listed:

B. Cornstarch will react with iodine and produce a blue-black color. This reaction is due to the presence of starch, which reacts with iodine to form a complex molecule called iodine starch.

A. Baking soda, also known as sodium bicarbonate, does not react with iodine and will not cause a color change.

C. Salt, also known as sodium chloride, does not react with iodine and will not cause a color change.

D. Powdered sugar, also known as sucrose, does not react with iodine and will not cause a color change.

5m is the amplitude of Wave A.

What is amplitude ?

A wave's amplitude is the separation between its starting point and its maximum displacement. Frequency is the quantity of waves traveling by a certain place each second. Period is the amount of time it takes for one wave cycle to finish.

What is wave ?

An energy-conducting disturbance in a medium known as a wave is one that does not involve any net particle motion. It could manifest as elasto-deformation, a shift in pressure, electric or magnetic intensity, electric potential, or temperature.

Therefore, 5m is the amplitude of Wave A.

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