what mass of co2 will be produced by the combustion of benzene that releases 1235 joules of heat? (10 points)

Answer:

When no coefficient is written in front of a formula it is assumed to be 1. 4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.

Explanation:

1. Reactants go on the left hand side and products go on the right hand side of a chemical equation. Be sure to write the correct formulas for the reactants and products.

· Remember atoms are conserved in a chemical reaction. ie they are neither created or destroyed. So all the atoms in the reactants must end up somewhere among the products.

2. Count the number of atoms of each element, compound or ion in the reactants and products. If they are not equal proceed further.

3. Balance the atoms one at a time by placing coefficients in front of the formula so that the numbers of atoms of each element are equal on both sides of the equation. Remember atoms may exist in an element, compound or ion.

· It is usually easier to start with the atoms that occur in only one substance on each side of the equation.

· Balance the atoms that occur in compounds before attempting to balance atoms that occur in elemental form. e.g. H2, O2 or Cl2

· To make it easier if a polyatomic ion appears unchanged on both sides of the equation treat it as a whole unit.

· When no coefficient is written in front of a formula it is assumed to be 1.

4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.

· Remember with subscripts, any number to the right of parentheses multiplies each subscript within the parentheses.

eg Fe2(SO4)3 contains 2 Fe atoms, 3 S atoms and 12 O atoms.

5. Finally make sure that all the coefficients are in the smallest possible whole number ratio.

The number which we will never use as a coefficient in any chemical reactions are decimals and fractions.

Coefficients are the numbers which are written before any chemical entity of any chemical reaction.

Coefficients of any reaction will not be:

Coefficients are generally use for balancing the chemical reactions.

So, we will not use decimals and fractions as a coefficient.

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Heating up a reaction increases the speed of a reaction until the enzyme denatures.

Enzyme denaturation occurs when a biological protein catalyst does not work anymore due to a high temperature that alters its tridimensional conformation.

This cellular process (denaturation) is well known to be one of the main causes of enzymatic failure.

In conclusion, heating up a reaction increases the speed of a reaction until the enzyme denatures.

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Answer:percent composition

Explanation:

In the preceding equation, 6.67 moles of boric acid (\(H_3BO_3\)) will react to generate 10 moles of water (\(H_2O\)).

To determine the number of moles of boric acid that react in the equation to produce 10 moles of water, we need to examine the balanced chemical equation and use stoichiometry.

1. Begin by examining the balanced chemical equation for the reaction involving boric acid and water. Let's assume the equation is:

  \(3H_2O\) + \(3H_2O\) -> \(B_2O_3\) + \(6H_2O\)

2. From the balanced equation, we can see that 2 moles of boric acid (H3BO3) react with 3 moles of water (\(H_2O\)) to produce 6 moles of water (\(H_2O\)).

3. Use the given information that 10 moles of water (\(H_2O\)) are produced. Since the stoichiometric ratio between boric acid and water is 2:3, we can set up a proportion to find the number of moles of boric acid:

  2 moles \(H_3BO_3\) / 3 moles \(H_2O\) = x moles \(H_3BO_3\) / 10 moles \(H_2O\)

4. Cross-multiply and solve for x:

  (2 moles \(H_3BO_3\))(10 moles \(H_2O\)) = (3 moles \(H_2O\))(x moles \(H_3BO_3\))

  20 moles \(H_2O\) = 3x moles \(H_3BO_3\)

5. Divide both sides of the equation by 3 to isolate x:

  x moles \(H_3BO_3\) = (20 moles \(H_2O\)) / 3

6. Calculate the value of x:

  x moles \(H_3BO_3\) ≈ 6.67 moles \(H_3BO_3\)

Therefore, approximately 6.67 moles of boric acid (\(H_3BO_3\)) will react to produce 10 moles of water (\(H_2O\)) in the given equation.

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In the given reaction, iron (Fe) is oxidized to form iron(III) oxide (Fe2O3), while oxygen (O2) is reduced to form water (H2O).

Oxidizing agent can be defined as a substance that oxidizes other substance and help carry out oxidation while reducing agent helps to reduce other element or compound present in a reaction. Both these processes, that is oxidation and reduction takes place simultaneously.

The oxidizing agent in this reaction is oxygen (O2), which accepts electrons from iron (Fe). The reducing agent is iron (Fe), which donates electrons to oxygen (O2).

The oxidation half-reaction is:
4Fe(s) → 4Fe3+(aq) + 12e-

The reduction half-reaction is:
3O2(g) + 12e- → 6O2-(aq)

Overall reaction:
4Fe(s) + 3O2(g) → 2Fe2O3(s)

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Answer:

An ion with 11 protons, 11 neutrons, and 10 electrons would have a charge of 1+, also expressed as a charge of positive one or +1.

Answer: Animation: Burning gas makes the air inside the balloon less dense, producing an upward force or lift. 1) A hot air balloon stays on the ground (or descends) when the air inside it is too cool. ... 3) When the air is hotter still, the balloon rises because the lift force is greater than the weight.

Explanation:

Common sense

Explanation:

The answer is the Golgi body

Answer:

b is the correct answer

If we triple the temperature and double the volume, The new pressure of the system be 10atm.

The equation of state for a fictitious ideal gas is known as the ideal gas law. Although it has several drawbacks, it is a decent approximation of the behaviour of numerous gases under various circumstances. The formula for the ideal gas equation is

To find pressure we us ideal gas equation:

PV = nRT

Therefore, if we multiply Volume by 2 and Temperature by 3, we get.

hence, by adding.

Given that nR are constant throughout, P (2V)=nR(3T).

then would only consider variables

P = 3T/2V

So p = 1.5 T/V

It can alternatively be expressed as P/1.5=T/V.

Pressure would therefore drop by a factor of 1.5 division.

The new pressure of the system is 10atm.

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The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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The answer is A produces a decrease in the entropy of the system

A)  we know that entropy is the measure of randomness. if randomness increases entropy also increases.

 entropy order of substances  : solid  <  liquid  < gas

here conversion of liquid to solid means randomness decreases . so that entropy decreases

B)  \(liquid \rightarrow gas\: conversion\) . so entropy is increases

C)  dissolution of LiOH. that means  LiOH molecules distributed more randomly in the solution so more disorder and more entropy

D)  ice melting means : solid to liquid so entropy also increases

E) gas mixing means more disturbed in the gases more disturb will leads to more randomness and more entropy

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Answer:

Explanation:Matter is anything that has weight and occupies space

Answer:

inside cells are removed

In the gravimetric method, it is important that you dissolve your sample in exactly 10 mL of water. A quantitative technique called gravimetric analysis uses the material to be measured to be selectively precipitated out of an aqueous solution.

With six-figure precision, it is used to calculate the atomic masses of several elements. It doesn't call for a set of criteria to calculate an unknown and leaves minimal space for instrumental mistake.

Precipitation of either the examined substance's cation or anion is required. The chemical under investigation must have an anion to cation ratio of 1:1. The material under investigation's cation and anion must both be precipitated.

A quantitative technique called gravimetric analysis uses the material to be measured to be selectively precipitated out of an aqueous solution. Filtration is used to remove the precipitate from the residual aqueous solution, and it is then weighed.

Thus, In the gravimetric method, it is important that you dissolve your sample in exactly 10 mL of water.

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Answer:

this would be the .04 it is very simple

Explanation:

To determine the best indicator for a titration, we need to consider the pKa value of the indicator and the pH range over which the indicator changes color. The indicator should change color as close as possible to the equivalence point of the titration.

In this case, the pH at the equivalence point of the titration is 2.54. We want an indicator that changes color around this pH value. Based on the Henderson-Hasselbalch equation, we can estimate the pH range over which the indicator changes color:

pH = pKa + log([A-]/[HA])

If we assume that the concentration of the acid and base are equal at the equivalence point, then [A-]/[HA] = 1, and we can simplify the equation to:

pH = pKa

So, the pH at which the indicator changes color is equal to its pKa value.

We need to choose an indicator with a pKa value close to 2.54. Looking at a table of acid-base indicators and their pKa values, we can see that methyl red has a pKa value of 5.1, which is too high for this titration. However, bromothymol blue has a pKa value of 6.0, which is closer to the pH at the equivalence point. The pH range over which bromothymol blue changes color is 6.0-7.6, which is also close to the pH at the equivalence point.

Therefore, bromothymol blue would be the best choice for determining the end point of this titration.

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In designing models of nuclear changes, the models of nuclei in nuclear fission becomes smaller while that in nuclear fusion becomes larger after the reaction.

Nuclear fission is a type of nuclear reaction in which The nucleus of larger atoms splits into two or more smaller nuclei of atoms of elements.

Nuclear fusion is a type of nuclear reaction in which The nucleus of two smaller atoms fuse to produce nuclei of a larger atom.

Therefore, in the models of nuclear reactions, the models in nuclear fission becomes smaller while that in nuclear fusion becomes larger.

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Answer:

hope this works for u!!!!!!

Explanation:

Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Molar enthalpy is the amount of energy per mole. Enthalpy is a thermodynamic quantity that corresponds to a system's total heat content according to this definition. It is equivalent to the system's internal energy plus the sum of the pressure and volume products. This value's unit of measurement is KJ/mol.

Entropy is assumed to be 1 kB/particle

kB: Boltzmann Constant = 1.3806*10^(23)/JK

Entropy, S = 1.3806*10^(-23) /JK

We are aware that S = Q/T

provided T = 83.85 k

and that Q = S*T = S*83.85k = 1.157*10(-21) J / particle.

Since 1 mole = 6.022x1023 particles of heat energy,

the formula for an is 1.157*10(-21)*6.022*10^23, which is 6.967*102 J/mole.

Argon's molar enthalpy is Q/n,

where n is the number of moles,

and ΔH equals 0.6967 KJ/mole.

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The statement that would best explain the observation of no liquid being evident in the sealed bottle is: b. Liquid and vapor are at equilibrium in the bottle.

When liquid and vapor are at equilibrium in a closed system, it means that the rate of condensation (liquid turning into vapor) is equal to the rate of vaporization (vapor turning into liquid). In this case, it appears that all the liquid has vaporized, and no liquid is evident. This suggests that the liquid and vapor have reached a state of equilibrium, where the amount of liquid remaining is negligible compared to the amount of vapor present.

The vapor state is favored when equilibrium is established because the pressure exerted by the vapor phase reaches a point where it equals the vapor pressure of the liquid at that temperature. At this equilibrium point, no further net condensation or vaporization occurs, resulting in the absence of visible liquid in the sealed bottle.


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Unsaturated solution: a solution in which more solute can be dissolved.

Explanation:

Salt dissolved in water or even sugar dissolved in water is an unsaturated solution if the quantity of dissolved salt/sugar is below the saturation point.

unsaturated solution: a solution in which more solute can be dissolved.

Explanation:

A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.

Answer:

Plant cells and animal cells are both eukaryotic cells. They both have a nucleus, Golgi complex, endoplasmic reticulum, ribosomes, mitochondria, cytoskeleton and cell membrane. Only plants cells have a vacuole, cell wall and chloroplast, while animal cells have cilia, centrioles and lysosomes which plant cells don't usually have. Because of their cell walls plant cells are in rigid rectangular shapes while animal cells have looser round shapes. The main difference in their functions is that animals don't produce their own food while plan cells do.

Answer:

Lawrencium (Lr)

Explanation:

The element with the given electron configuration is Lawrencium (Lr), which has an atomic number of 103.

Answer:

A precipitate is formed as a result of a double displacement reaction. Explanation: When two substances (can be aqueous or liquids) in solution ...

(a) The melting of ice cubes at 10°C and 1 atm pressure, (c) alignment of iron filings in a magnetic field, and (d) the reaction of sodium metal with chlorine gas to form sodium chloride are spontaneous processes.

(a) The melting of ice cubes at 10°C and 1 atm pressure is a spontaneous process because it occurs naturally without any external influence. As the temperature increases, the ice gains energy, and the intermolecular forces holding the solid together weaken. This allows the ice molecules to overcome the forces and transition into the liquid state.

(b) The separation of a mixture of N₂ and O₂ into pure N₂ and pure O₂ samples is not a spontaneous process. It requires external energy input, such as fractional distillation or selective adsorption, to achieve the separation. The gases do not naturally separate on their own.

(c) The alignment of iron filings in a magnetic field is a spontaneous process. Iron filings are composed of small magnetic domains with randomly oriented magnetic moments. When exposed to a magnetic field, the field exerts a torque on the magnetic moments, aligning them in the same direction as the field. This alignment occurs spontaneously without any external intervention.

(d) The reaction of sodium metal with chlorine gas to form sodium chloride is a spontaneous process. Sodium has a strong tendency to lose an electron, while chlorine has a strong tendency to gain an electron. When sodium and chlorine come into contact, a chemical reaction takes place spontaneously, resulting in the formation of sodium chloride.

(e) The dissolution of HCl(g) in water to form concentrated hydrochloric acid is not a spontaneous process. It requires the input of energy, typically in the form of heat, to break the intermolecular forces between HCl molecules and enable their dispersion in water.

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The bond angles in SF₅⁺ are expected to be 90°, 120°, and 180°.

The correct option is E.

Bond angles refer to the angles between the bond linking the atoms of elements in a compound or ion.

The bond angles exist as a result of either electrical repulsion between the electrons in the bonds.

The ion SF₅⁺ contains one atom of sulfur and five atoms of fluorine linked together by covalent bonds. The shape of the ion or the molecular geometry is square pyramidal. Hence, the bond angles are 90°, 120°, and 180°.

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A common method used in chemistry is to measure the mass of the reactants before the reaction and the mass of the products after the reaction. By comparing the two masses, one can determine if all the KHCO3 has reacted. If the mass of the product matches the mass of the reactant, it can be assumed that all the KHCO3 has reacted.

To ensure that all the KHCO3 (potassium hydrogen carbonate) was reacted in an experiment, several methods can be employed.

One common method is to perform a visual inspection of the reaction mixture after the reaction time has elapsed. In this case, if there is no visible presence of the KHCO3 solid in the mixture, it can be assumed that all the KHCO3 has reacted. However, this method is not always reliable, as it is possible that some of the KHCO3 may have dissolved and become transparent, making it difficult to visually detect.

Another method is to measure the pH of the reaction mixture before and after the reaction. Since KHCO3 is an acid salt, it reacts with water to form carbonic acid, which is unstable and breaks down into water and carbon dioxide gas. This reaction results in a decrease in pH. Therefore, by measuring the pH of the reaction mixture before and after the reaction, one can determine if all the KHCO3 has reacted. If the pH has decreased significantly, it can be assumed that all the KHCO3 has reacted.

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