CHEMISTRY HIGH SCHOOL

The coefficients in a chemical equation represent the

Answers

Answer 1
Answer:

Answer:

  • The coefficients in a chemical equation represent the relative number of moles of each reactant and product that interven in the chemical reaction.

Explanation:

The coefficients are the numbers that you put in front of each chemical formula that represents the reactants and products in the chemical equation. They indicate the mole ratio in which the elements or compounds react to form the products, as per the chemical equation.

See an example:

  • Word equation: hydrogen and oxygen produce water

  • Chemical (skeleton) equation: H₂ (g) + O₂(g) → H₂O (g)

      This equation is not balanced: the  number of atoms of oxygenin the reactant side is 2 while the number of atoms of oxygen isn the product side is 1. In order to balance the equation you need to add some coefficients.

When no coefficients are shown it is understood that the coefficient is 1.

  • Balanced chemical equation: 2H₂ (g) + O₂(g) → 2H₂O (g)

The coefficients 2 in front of H₂ and 1 (understood) in front of O₂, in the reactant side, and 2 in front of H₂O, in the product side, balance the equation.

Those coefficients mean that the 2 molecules (or mole of molecules) of H₂ react with 1 molecule (or mole of molecules) of O₂ to form 2 molecules (or moles) of H₂O (product side).

That is the mole ratio: 2 H₂ : 1 O₂ : 2 H₂O.

Notice that, in spite of the aboslute numbers may change, the mole ratio is unique for any chemical reaction.  For example 4 : 2 : 4 is the same ratio that 2 : 1 : 2, or 8 : 4 : 8, but the most common practice is to use the most simple form of the ratio, i.e. 2: 1: 2.

Answer 2
Answer:

The representation that coefficients that are found in a chemical equation provide, is :  number of moles that is present in the reactants as well as products.

  • The coefficients of the equation helps to know the  number of moles that is present in reactants as well as  products in a balanced equation.

  • If the equation is not balanced, then it needs to be balanced first, with information of the  coefficients, it is possible to calculate components of reactants as well as the products that is taking part in the chemical reaction.

Learn more at:

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Related Questions

MIDDLE SCHOOL

9. If we start with 12 moles of diesel (C16H34), how many moles of water and carbon dioxide will be produced in a complete combustion reaction?​

Answers

Answer:

204 moles of water and 192 moles of carbon dioxide.

Explanation:
  • The complete combustion of hydrocarbons results to the formation of water and carbon dioxide as the products.
  • Diesel is an example of a hydrocarbon whose combustion will yield water and carbon dioxide.
  • The equation for the combustion of diesel is given by;

2C₁₆H₃₄ + 49O₂ → 32CO₂ + 34H₂O

We are given 12 moles of diesel

Required to determine the number of moles of water and carbon dioxide.

  • From the equation;

2 moles of diesel reacts to generate 32 moles of carbon dioxide and 34 moles of water.

Therefore;

Moles of water = moles of diesel × 34/2

                        = 12 moles × 34/2

                        = 204 moles

Moles of Carbon dioxide = Moles of diesel × 32/2

                                          = 12 moles × 32/2

                                          = 192 moles

Therefore, the combustion of 12 moles of diesel yields 204 moles of water and 192 moles of carbon dioxide.

MIDDLE SCHOOL

How many moles are in 250 grams of carbon dioxide gas

Answers

Answer:

                        5.68 mol of CO₂

Explanation:

                    Mole is a chemical unit used to determine the amount of a substance also referred as chemical amount.  Also, it represents 6.022 × 10²³ of an entity. For example, 1 mole of Magnesium metals contains 6.022 × 10²³ atoms.

Mole is given as,

                                         Moles = Mass / M.Mass

This equation shows that when the mass of a substance is given then one can calculate its moles by dividing its mass by M.Mass or Atomic Mass.

As we know the M.Mass of CO₂ is 44.01 g/mol therefore, the moles are calculated as,

Moles  =  250 g / 44.01 g/mol

Moles  =  5.68 mol of CO₂

HIGH SCHOOL

What allows a gas to fill a container? A. the shape of the particles in a gas
B. the size of the particles in a gas
C. the constant motion of the particles in a gas

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that particles of a gas are held by weak Vander waal forces, therefore, there is no force of attraction between gas molecules.

As a result, these particles are in random motion.

Thus, we can conclude that out of the given options, the constant motion of the particles in a gas allows a gas to fill a container.

MIDDLE SCHOOL

What is the KE of 750 kg car moving at 25 m/s?

Answers

Answer: 234,375 J=234.375 kJ

Explanation:

K= m*V²/2

K=750kg*625m²/s²/2=234375 J

HIGH SCHOOL

Cost of production reports can also be used to compare the materials output quantity to the a.administrative staff input quantity. b.materials input quantity. c.conversion output quantity. d.total conversion for the period.

Answers

Answer:

b.materials input quantity

Explanation:

A cost of production report shows the following:

  • total and unit costs transferred from preceding department
  • materials, labor , factory Overhead added by the department
  • unit costs added by the department
  • total and unit costs accumulated to the end of operations
  • the cost of beginning and ending work in process inventories
  • the cost transferred to the next department

A cost of production report determines periodic total and unit costs.

Either in the cost of production report or in the supporting schedule each item of material used is listed, every labor operation is shown separately,factory overhead components are noted individually, and a unit cost is derived for each item.

A Quantity Schedule Of Cost of Production report  shows the following

  • units started in process
  • units transferred to next department
  • units still in process
  • units lost in process

HIGH SCHOOL

Rank the following in terms of decreasing miscibility in C₈H₁₈ (octane), a major component of gasoline: C₂H₅Cl (chloroethane),
H₂O (water),
C₂H₅F (fluoroethane), and
C₉H₂₀ (nonane).

Answers

Answer:

In order of decreasing miscibility

C₉H₂₀ (nonane)→C₂H₅F (fluoroethane)→C₂H₅Cl (chloroethane)→H₂O (water)

Explanation:

The solubility of a solid is a measure of its ability to dissolve in a liquid while for liquids,  the miscibility is a measure of thhe liquid to mix with anoyjer liquid resulting in a soltion which can hold any amount of either liquids. Immiscible liquids are those that are not soluble or have very limited solibility with each other.

C₉H₂₀ (nonane)→C₂H₅F (fluoroethane)→C₂H₅Cl (chloroethane)→H₂O (water)

In the order of decreasing miscibility as like dissolve like, ability to dissociate and polar and organic characteristics are considered

MIDDLE SCHOOL

When a pure substance melts does its particles get larger

Answers

I think so ( for solids ) because you know when you melt chocolate it turns into a liquid and liquids allways move around together and it can't get smaller either so, I think you are right.
HIGH SCHOOL

Which particles make up the nucleus of an atom? protons and electrons
electrons and neutrons
neutrons and protons
protons, neutrons, and electrons

Answers

Protons and neutrons
electrons just revolve around it
Protons and neutrons
HIGH SCHOOL

181 mL of an unknown HCl solution was neutralized in a titration with 36.2 mL of 0.250 M NaOH. What is the molarity of the unknown HCl solution

Answers

Answer: The molarity of the unknown HCl solution is 0.05 M

Explanation:

To calculate the molarity of acid, we use the equation given by neutralization reaction:

where,

are the n-factor, molarity and volume of acid which is

are the n-factor, molarity and volume of base which is NaOH.

We are given:

Putting values in above equation, we get:

Thus the molarity of the unknown HCl solution is 0.05 M

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