A chip is burned beneath an aluminum container holding 28.7 g of water causing the temperature of the water to increase from 11.3 °C to 33.2 °C. How many joules of heat were absorbed by the water? Water’s specific heat is 4.18 J/gºC

Answer:

The pH change will be neutral. I.e pH of 7.

Explanation:

The pH change will be neutral because reaction between hydrochloric acid and sodium hydroxide will result in the formation of sodium chloride salt and water. Sodium chloride salt and water is neutral because reaction between strong acid(pH is acidic) and strong base( pH is basic) will produce neutral salt with pH of 7. This salt does not hydrolyze.

The equilibrium concentrations of fe3 and hscn using eq. 4. report 6 values for each will be 9.26 x 10^-8 M.

To calculate the equilibrium concentrations of Fe3+ and HSCN using equation 4, we first need to know the initial concentrations of Fe3+ and HSCN, as well as the equilibrium constant (Kc) for the reaction Fe3+(aq) + HSCN(aq) ↔ Fe(SCN)2+(aq) + H+(aq). Once we have these values, we can use the equation:

Kc = [Fe(SCN)2+][H+]/[Fe3+][HSCN]

To solve for the equilibrium concentrations of Fe3+ and HSCN.

Assuming the initial concentrations of Fe3+ and HSCN are both 0.1 M, and the value of Kc is 1.2 x 10^5 M^-1, we can solve for the equilibrium concentrations using the following steps:

1. Write out the balanced chemical equation: Fe3+(aq) + HSCN(aq) ↔ Fe(SCN)2+(aq) + H+(aq)

2. Define the initial concentrations of Fe3+ and HSCN: [Fe3+] = 0.1 M, [HSCN] = 0.1 M

3. Use the equation Kc = [Fe(SCN)2+][H+]/[Fe3+][HSCN] to solve for [Fe(SCN)2+] and [H+], since they are the only unknowns in the equation.

4. Plug in the known values and solve for [Fe(SCN)2+] and [H+]:

Kc = [Fe(SCN)2+][H+]/[Fe3+][HSCN]

1.2 x 10^5 = [Fe(SCN)2+][H+]/(0.1 M x 0.1 M)

[Fe(SCN)2+] = (1.2 x 10^5 x 0.01)/(1 + 1.2 x 10^5 x 0.1)

[H+] = [Fe3+] x [HSCN]/[Fe(SCN)2+]

[H+] = (0.1 M x 0.1 M)/[Fe(SCN)2+]

5. Calculate the equilibrium concentrations of Fe3+ and HSCN by subtracting the change in concentration from the initial concentration:

[Fe3+]eq = [Fe3+] - [Fe(SCN)2+]

[HSCN]eq = [HSCN] - [Fe(SCN)2+]

6. Report the equilibrium concentrations of Fe3+ and HSCN, rounded to two decimal places:

[Fe3+]eq = 0.09 M

[HSCN]eq = 0.01 M

[Fe(SCN)2+] = 1.08 x 10^-3 M

[H+] = 9.26 x 10^-8 M

To know more about equilibrium concentrations refer here:

https://brainly.com/question/29136736?#

#SPJ11

The energy levels in which electrons orbit around the nucleus are also called electron shells.

All atoms contain electrons, protons and neutrons. The protons and neutrons are located in the center of the atom called the nucleus. Electrons orbit around the nucleus in electron orbits or shells.

Electron shells or energy levels are the paths followed by electrons as they orbit round the nucleus. The shells are used to determine an atom's electronic configuration and atomic structure.

The shells in an atom are given a number, starting from the innermost shell to the outermost shell, called the principal quantum number, denoted with the letter n. The farther away a shell is from the nucleus, the higher the energy level and the higher the principal quantum number.

Learn more about atoms here:

https://brainly.com/question/12904555

#SPJ4

The elements are

chlorine (Cl) oxygen (O) nitrogen (N)

Lithium (Li) | Li Cl₁ | Li₂ O₁ | Li₃ N₁

Magnesium (Mg) | Mg₁ Cl₂ | Mg O₂ | Mg₃ N₂

Aluminum (Al) | Al₃ Cl₃ | Al₂ O₃ | Al N₃

To obtain an electrically neutral compound, the total positive charge of cations (positively charged ions) in an ionic compound must equal the total negative charge of anions (negatively charged ions).

To balance the total charge, multiply the number of each ion times the charge on the ion by the least common multiple (LCM) of the charges.

In this table, we need to figure out how many positive and negative ions are needed to balance the charges of the specified ionic compounds. Part A of the issue allows us to calculate the charges of the ions.

As shown in the completed table above, we can determine the number of ions needed for the remaining compounds.

learn more about ionic compounds here

https://brainly.com/question/2687188

#SPJ9

The total amount of heat : 225.704 kJ

Heat of vaporization(ΔH vap) : heat needed to vaporize 1 mole of water , units : kJ/mol

For water at boiling point (100 °C) : ΔH vap = 40.66 kj/mol

mole of 100 g water :

\(\tt \dfrac{100}{18.015}=5.551\)

so total Heat :

\(\tt 40.66\times 5.551=225.704~kJ\)

The bottle of catechol for the enzyme kinetics i and ii labs is the source of the catalyst for the reaction.

Enzyme kinetics—what exactly do you mean?

The study of enzyme kinetics examines the maximum catalytic rates that can be reached as well as the preferences of substrates and inhibitors for binding. As highly specialized catalysts for biochemical processes, enzymes each exhibit selectivity for a single reactant or substrate.

A catalyst is something that speeds up a chemical reaction or reduces the temperature or pressure required to initiate one without being consumed by the reaction. The addition of a catalyst to speed up a chemical is called catalysis.

To learn more about catalyst use:

https://brainly.com/question/318426

#SPJ1

a. NH3 (Ammonia): In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted.

b) 1.0L container of CHCl3 at STP, dipole-dipole interactions (along with London dispersion forces) would be present.

a. NH3 (Ammonia):

In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted. Ammonia (NH3) molecules consist of one nitrogen atom bonded to three hydrogen atoms, forming a trigonal pyramidal shape.

Hydrogen bonding is a type of intermolecular force that occurs when a hydrogen atom is covalently bonded to an electronegative atom (in this case, nitrogen) and interacts with another electronegative atom (in this case, the nitrogen atom of a neighboring NH3 molecule).

b. CHCl3 (Chloroform):

In a 1.0L container of CHCl3 (chloroform) at STP, intermolecular forces such as dipole-dipole interactions would be exerted. Chloroform (CHCl3) molecules consist of one carbon atom bonded to three hydrogen atoms and one chlorine atom, forming a tetrahedral shape.

Dipole-dipole interactions arise due to the difference in electronegativity between chlorine and hydrogen atoms. The chlorine atom is more electronegative than hydrogen, resulting in a polar covalent bond.

While dipole-dipole interactions are present in CHCl3, it is worth noting that CHCl3 also exhibits London dispersion forces. These forces occur due to temporary fluctuations in electron distribution, creating temporary dipoles.

London dispersion forces are the weakest type of intermolecular force but still contribute to the overall intermolecular interactions in CHCl3.

For more such questions on Standard Temperature and Pressure visit:

https://brainly.com/question/14820864

#SPJ8

The Moon is able to fully cover the Sun during a solar eclipse because of its current orbit. One million years from now, this will change because the Moon is slowly moving ____________ from the Earth.

\( \\ \)

The Moon is able to fully cover the Sun during a solar eclipse because of its current orbit. One million years from now, this will change because the Moon is slowly moving away from the Earth.

\(__________\)

Because the Moon passes between Earth and the Sun during a solar eclipse, the Sun is fully hidden. Even though the Moon is much smaller than the Sun, it may entirely obscure the Sun's light from Earth's perspective because it is just the appropriate distance away.

The moon is slowly moving away from earth as  due to the effect of gravity of moon on the earth.

The moon is moving away from the earth due to the effect of it's gravity on earth.Tides which rise in the ocean  cause a drag and thus slow down the spin rate of earth.

This results in loss of angular momentum  which is compensated by the moon speeding up and thus moving away  from the sun. Due  to the moon's gravitational pull  there is production of tidal forces due to which earth's surface bulge out and cause rotation of the earth to loose momentum.Earth's rotation cause this tidal bulge  to occur in  a position which is  slightly ahead of moon in it's orbit around the sun.

As the moon moves away the orbital speed increases and earth's rotation slows down .

Learn more about moon ,here:

https://brainly.com/question/14042561

#SPJ2

The fingerprint region is important because different compound produces different pattern of troughs on the spectrum.

a)A  broad peak in the region between 3100 and 3600 cm-1 shows the presence of exchangeable protons from alcohol, amine, amide or carboxylic acid groups.

b)When sample does not absorb any radiation then all the radiation is transmitted and sample has 100% transmittance. Hence, absorptions in the IR spectrum are as downward deflection that is an “upside-down peak.

b)Homonuclear diatomic molecules do not show IR spectra because they  do not have a permanent dipole moment nor the stretching of the atoms about the bond gives any dipole moment

Triggering of molecular vibrations through irradiation with infrared light is called Infrared Spectroscopy. It provides information about the presence or absence of certain functional groups.

The range of IR absorption for covalent bonds is 600 - 4000 cm-1.

An IR -spectrum shows peaks from the range of 3600 to 500 cm-1. IR -frequencies corresponding to the molecular vibrations frequencies.

IR spectra is called fingerprint region because absorption pattern is quite complex but unique for each organic structure. The vibrations for both the carbon-carbon and carbon-oxygen double bonds are identified at 6.1 and 5.8 μm, respectively.

To know more about Infrared Spectroscopy, refer

https://brainly.com/question/28543039

#SPJ4

Answer:

2.5.2 Atomistic Configurations of Oxygen in Silicon Crystals

Oxygen atoms are incorporated in the silicon lattice on an interstitial position (denoted by Oi), where the oxygen atom sits in an almost bond-centered position between two adjacent Si atoms [101]. Several of the local vibration modes are infrared (IR) active. The predominant IR line at 1104/cm (at room temperature) was calibrated with respect to other analytical methods, such as gas fusion and several radioactive techniques, and is used as the standard method for the quantitative determination of the oxygen content in as-grown silicon crystals (as-grown silicon usually contains only a negligible amount of precipitated oxygen).

Answer:

CrO₂ --------------------> Cr⁴⁺ and O²⁻

VCO₃ -------------------> V²⁺ and CO₃²⁻

Cr₂(SO₄)₃ -------------> Cr³⁺ and SO₄²⁻

(NH₄)₂S ----------------> NH₄⁺ and S²⁻

Explanation:

Within ionic compounds, the cation is listed first, followed by the anion. Some of the ions are polyatomic, meaning they are covalently bonded to other elements. Polyatomic ions always have a specific charge.

All of these ionic compounds have an overall charge of 0. As such, the charges of the cations and anions must balance out. In order to do so, there are some compounds which have more than one atom of each ion.

2.) CrO₂

------> Oxygen (O) always forms the anion, O²⁻.

------> Therefore, if there are 2 oxygen anions, the chromium (Cr) must have the cationic form of Cr⁴⁺.

------> +4 + (-2) + (-2) = 0

3.) VCO₃

------> Carbonate (CO₃), a polyatomic ion, always has the state CO₃²⁻.

------> If there is only one atom of each ion, the charges must perfectly balance, making vanadium (V) be the cation V²⁺.

------> +2 + (-2) = 0

4.) Cr₂(SO₄)₃

------> Sulfate (SO₄), a polyatomic ion, always has the state SO₄²⁻.

-------> The only way the charges could balance out is if the chromium (Cr) is in the cationic form Cr³⁺.

------> +3 + 3 + (-2) + (-2) + (-2) = 0

5.) (NH₄)₂S

------> Ammonium (NH₄), a polyatomic ion, always has the state NH₄⁺.

------> Sulfur (S) always forms the anion S²⁻.

------> +1 + 1 + (-2) = 0

The balanced chemical equation for the reaction between sodium and oxygen to form sodium oxide is: 4Na + O2 → 2Na2O According to the balanced equation, 4 moles of sodium react with 1 mole of oxygen to produce 2 moles of sodium oxide.

Therefore, the stoichiometric ratio is 4:1:2 (sodium:oxygen:sodium oxide). If you have 8 moles of sodium, you can use the stoichiometry to determine the amount of sodium oxide produced. Since the ratio of sodium to sodium oxide is 4:2, you would expect to produce half the number of moles of sodium oxide compared to the moles of sodium. Therefore, with 8 moles of sodium, you would expect to produce 4 moles of sodium oxide.

Learn more about stoichiometric ratio here: brainly.com/question/29093629

#SPJ11

Answer:

Displacement reaction

Explanation:

:)

The reaction in which a more reactive metal displaces a less reactive metal from its salt solution is called a single displacement reaction.

The reaction you are referring to is called a "displacement reaction" or "single displacement reaction." In this type of reaction, a more reactive metal displaces a less reactive metal from its salt solution. This reaction occurs because metals have different reactivity levels, and more reactive metals have a greater tendency to lose electrons and form positive ions.

The displacement reaction can be represented by the general equation:

A + BC → AC + B

Where A is a more reactive metal, BC is the salt solution of a less reactive metal, AC is the salt solution of the more reactive metal, and B is the less reactive metal that is displaced.

For example, in the reaction between zinc (more reactive) and copper sulfate solution (less reactive), zinc displaces copper from the copper sulfate solution:

Zn + CuSO₄ → ZnSO₄ + Cu

Here, zinc (Zn) displaces copper (Cu) from copper sulfate (CuSO₄) to form zinc sulfate (ZnSO₄) and copper.

Hence, the reaction is known as a single displacement reaction.

Learn more about displacement reaction here:

https://brainly.com/question/29740109

#SPJ 5

The net redox reactions and labels involving the two types of electron carriers in acetyl CoA formation and the citric acid cycle are:

Acetyl CoA Formation: (b) NADH and (a) CO2

Citric Acid Cycle: (b) NADH, (d) FADH2, and (a) CO2

The metabolic process of acetyl CoA formation and the citric acid cycle is a key pathway for energy production in cells.

Pyruvate, the end product of glycolysis, is completely oxidized during this process, and the electrons produced from this oxidation are passed on to two types of electron acceptors: NAD+ and FAD. NAD+ is reduced to NADH, while FAD is reduced to FADH2.

These electron carriers play a critical role in the production of ATP, which is the primary energy currency of cells. The NADH and FADH2 produced during these reactions are then used in the electron transport chain to generate a proton gradient, which drives the synthesis of ATP.

Acetyl CoA Formation:

Pyruvate + CoA + NAD+ -> Acetyl-CoA + CO2 + NADH

Citric Acid Cycle:

Acetyl-CoA + 3NAD+ + FAD + GDP + Pi -> 2CO2 + 3NADH + FADH2 + GTP + CoA

So the labels would be:

Acetyl CoA Formation: (b) NADH and (a) CO2

Citric Acid Cycle: (b) NADH, (d) FADH2, and (a) CO2

for more such question on redox reactions

https://brainly.com/question/459488

#SPJ11

The practical interpretation is that f(2, 3) represents the concentration of a 2 mg dose in the blood 3 hours after injection.

To evaluate the expression f(2, 3) using the provided function \(84e^-12\), we substitute x = 2 and t = 3 into the function.

\(f(2, 3) = 28(3)e^-(6-2)(3)\)

         \(= 84e^-12\)

Practical interpretation: f(2, 3) represents the concentration of a 2 mg dose in the blood 3 hours after injection.

The given function \(f(x, t) = 28te^-(6-x)t\) provides the concentration of a drug in the blood based on the amount of drug given (x) and the time since injection (t). In this case, x is the dose of the drug in milligrams, and t is the time in hours.

So, when we evaluate f(2, 3), it means we are finding the concentration of a 2 mg dose in the blood 3 hours after injection. By substituting x = 2 and t = 3 into the function, we calculate the result as \(84e^-12\).

Therefore, the practical interpretation is that f(2, 3) represents the concentration of a 2 mg dose in the blood 3 hours after injection.

learn more about concentration on:

https://brainly.com/question/17206790

#SPJ11

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

Learn more about NaCl

https://brainly.com/question/32275922?

#SPJ11

Answer:

An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.

The rate of chemical reaction in the body is controlled by enzymes

Chemicals go into the body. They enter the body through the mouth, the throat, or (less frequently) the skin. Several are essential to the procedures mentioned above. Some can cause illness or disease because they are "foreign" to the body.

Chemical substances go through typical chemical reactions within the body, including neutralization, hydrolysis, oxidation, and reduction. But they are not random.

Each, however, is a component of a metabolic process. Anabolism, in which the body builds molecules via anabolic pathways, and catabolism, in which the body breaks down molecules through catabolic pathways, are two different types of metabolism.

All are regulated by an assembly of proteins known as enzymes. Biochemical catalysts are called enzymes to change the rate at which reactions occur. But unlike the majority of chemical catalysts, enzymes are extremely selective, promoting just certain responses.

To learn more about Oxidation,

https://brainly.com/question/25886015

The three alkenes using systematic names are ethene, propene, and butene.

1. Ethene: It is the simplest alkene with the molecular formula \(C_{2}H_{4}\). Its systematic name is derived from the prefix "eth-" (2 carbon atoms) and the suffix "-ene" (indicating a carbon-carbon double bond).
2. Propene: It has the molecular formula \(C_{3}H_{6}\), consisting of 3 carbon atoms and a double bond. The systematic name comes from the prefix "prop-" (3 carbon atoms) and the suffix "-ene".
3. Butene: It has the molecular formula \(C_{4}H_{8}\), containing 4 carbon atoms and a double bond. Its systematic name is derived from the prefix "but-" (4 carbon atoms) and the suffix "-ene".
Ethene, propene, and butene are the systematic names of three alkenes, each having different numbers of carbon atoms and a carbon-carbon double bond.

For more information on alkene kindly visit to

https://brainly.com/question/29972041

#SPJ11

Answer:

121 million joules energy is released

Explain :

As there are 500 moles of hydrogen gas in a kilogram, this means that burning a kilogram of hydrogen gas releases 500 times as much energy or 121 million joules .

Answer:

142.218

Explanation:

The ideal gas law is PV=nRT

P= pressure in kpa

V= volume

n= number of moles

R= always equals 8.31

T= temperature in kelvins

P= (1.25)(101.3)= 126.625kPa

V= 14L

n= 1.50 mol

R= 8.31

T= ?

Multiply (126.625)(14) then divide that by (1.5)(8.31) to get your temperature in kelvins

Answer:

See below

Explanation:

From periodic table

mole weight of Fe   is   55.845  gm / mole

76.15 gm  /  55.845 gm/mol   *  6.022 x 10^23  atoms/mole =

                8.212 x 10^23   atoms    ( four signif. digits)

Z is the solvent, Y is soluble in water while X is insoluble in water.

Filtration is a method of separation of substances based on particle size. Only a particular particle size can pass through the filter. The substance that remains in the filter is the residue while the substances that passes through the filter is called the filtrate.

From the observation in the question Z is the solvent, Y is soluble in water while X is insoluble in water.

Learn more about separation of mixtures: https://brainly.com/question/863988

The dissolution of ammonium nitrate is an endothermic process and The solubility will be greater in warmer water.

Temperature is a bodily quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured by using a thermometer. Thermometers are calibrated in diverse temperature scales that historically have trusted various reference points and thermometric materials for definition.

Temperature plays a vital role in hospital treatment (each people and animal), food, drinks, and agriculture. Our typical health is often reliant upon the temperature in many methods as properly. Preserving the right temperature degrees in medical cold garage areas is crucial.

The SI unit of temperature as in line with the international machine of units is Kelvin that's represented by the symbol K.

Learn more about temperature here:-https://brainly.com/question/2339046

#SPJ4

Both phosphorus and chlorine are non-polar because the four atoms of phosphorus (P4) cancel each other out and remain non-polar, while the two atoms of chlorine (Cl2) exert equal but opposite forces on one another and cancel each other out.

All four phosphorus atoms are connected to one another in the tetraphosphorus molecule shown below. Each phosphorus atom shares the same properties, which results in an identical electronegativity. Tetraphosphorus is hence nonpolar since each phosphorus atom's electron attraction in the two opposite directions is the same, canceling out one another.

The shared pair of electrons in a chlorine molecule (Cl2) is equally attracted by the two chlorine atoms, resulting in a nonpolar bond. as a result, chlorine is non-polar molecule.

To know more about polarity visit here ; https://brainly.com/question/15207647?referrer=searchResults

#SPJ4

A negative exponent in scientific notation tells us that the number is a very small number, closer to zero than one.

A negative exponent means that the number is being divided by a power of ten. For example, 1.2 x 10^-3 means 1.2 divided by 1,000. To explain further, the negative exponent tells us the number of decimal places the decimal point needs to be moved to the left to get the actual value of the number. In other words, the exponent indicates the number of zeros in the denominator of the fraction. The negative exponent signifies that the number is expressed in a smaller unit, which means it is a fraction of the original number. For instance, if we have 0.003 in scientific notation, it means that the number is a fraction of 1,000, which is why we divide by 10 to the power of 3, and move the decimal point three places to the left.

A negative exponent in scientific notation indicates that the number is a small decimal value, less than 1. It tells us that we need to move the decimal point to the left to obtain the actual number. The negative exponent shows how many places to move the decimal point.

To know more about scientific notation, visit:

https://brainly.com/question/16936662

#SPJ11

The value of b in the equation \(\( f(t) = 85 \cdot b^t \)\) represents the decay factor of the radioactive substance. To determine the value of \( b \), we can use the information that the half-life of the substance is 21 years.

The half-life of a radioactive substance is the time it takes for half of the substance to decay. In this case, the half-life is 21 years, which means that after 21 years, the amount of the substance remaining will be half of the initial amount.

We can use this information to set up an equation:

\(\(\frac{1}{2} = b^{21}\)\)

To solve for b, we need to take the 21st root of both sides of the equation:

\(\(b = \left(\frac{1}{2}\right)^{\frac{1}{21}}\)\)

Using a calculator, we can evaluate this expression:

\(\(b \approx 0.965\)\)

Therefore, the value of b in the equation \(\( f(t) = 85 \cdot b^t \)\) is approximately 0.965.

Learn more about radioactive from this link:

https://brainly.com/question/1770619

#SPJ11

Answer:

The statements that correctly describe chemical reactions are

A. If the reactants include 5 atoms of Fe, then the products must include 5 atoms of Fe.

C. If the reactants include an aluminum atom, then the products must include an aluminum atom.

E. If there are a total of 15 atoms in the reactants, there must be a total of 15 atoms in the product.

Explanation:

In a chemical reaction, reactants are the elements or compounds that react to give a particular product(s). The reactants are the substances that start the chemical reaction and they are found at the left hand side of the chemical equation. While the products are found at the right hand side of the chemical equation and they are seen at the end of the reaction.

In chemical reaction, the number of atoms that starts the reaction remains the same. That is the same number of atoms is seen in the products. This follows the law of conservation of matter - which postulates that matter cannot be created or destroyed.

But in a chemical reaction, number of molecules are not conserved.

The statements that correctly describe chemical reactions are:

A. If the reactants include 5 atoms of Fe, then the products must include 5 atoms of Fe.

C. If the reactants include an aluminum atom, then the products must include an aluminum atom.

E. If there are a total of 15 atoms in the reactants, there must be a total of 15 atoms in the product.

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same.

Thus, the statements that are true for a chemical reactions are A, C and E.

Find more information about Chemical reaction here: brainly.com/question/26018275

Answer:

The method which is used to separate a mixture of oil and vinegar is separation by density. Density is defined as the ratio of mass to the amount of matter i.e. volume.

Explanation: