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3 years ago

What is not represented by a balanced chemical equation?

Chemistry

2 answers:

Vladimir [108]3 years ago

7 0

The correct answer is:

B) The same subscripts are on each side of the equation.

katrin [286]3 years ago

3 0

Answer: The correct answer is Option B.

Explanation:

A balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This means that total mass on the reactant side is equal to the total mass on the product side.

This also means that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.

For Example: Reaction of hydrochloric acid with sodium hydroxide, the equation follows:

$HCl+NaOH\rightarrow NaCl+H_2O$

From the above chemical equation, the chemical formula for the substances are written correctly on both the sides of the reaction. But the subscript of hydrogen on the reactant side is 1 and on the product side is 2.

Thus, the correct answer is Option B.

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3 years ago

HURRY What is the volume of a cube with an edge length of 0.843

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Answer:

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4 years ago

Read 2 more answers

Đốt cháy hoàn toàn 0,1 mol axit đơn chức cần V lít O2 ở đktc. Thu được 0,3 mol CO2 và 0,2 mol h20 vậy giá trị V là

maria [59]

Answer:

Complete combustion of 0.1mol of monocarboxylic acid requires V litres of O2 at dtc. and the reaction produces 0.3mol of CO2 and 0.2mol of H2O.

What is the value of V?

Explanation:

The balanced chemical equation of the reaction is

$HCOOH+O_2 -> 2CO_2+2H_2O\\$

1mol. of acid reacts with 1mol of $O_2$ and produce 2mol. of CO2 and 2mol. of H2O.

Given,

0.1mol of acid requires how many litres of oxygen at STP?

0.1mol of acid requires 0.1mol of oxygen.

Since, 1mol of oxygen at STP occupies 22.4L of volume.

Hence, the volume occupied by 0.1mol of oxygen is -- 2.24L

Answer is:

The value of V is 2.24L.

3 0

3 years ago

what is the difference between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminum

igomit [66]

Answer:

The atomic number of Selenium is 34. This means that Selenium possesses 34 electrons.

The atomic number of Aluminium is 13. This means that Aluminium has 13 electrons.

Hence, there is a difference of 21 between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminium.

Selenium has 6 electrons in it's outer most shell whereas aluminium has 3 electrons in its outer most shell. As a result, aluminium will have a greater tendency to lose one of its outer most electrons to become stable.

7 0

3 years ago

The lattice energy of a salt is 350 kJ/mol and the solvation energies of its ions add up to 320 kJ/mol for the preparation of a

4vir4ik [10]

Answer:

It would get colder

Explanation:

The lattice energy is the energy involved in the disruption of interactions between the ions of the salt. In this case, we have: ΔHlat = 350 kJ/mol > 0, so it is an endothermic process (the energy is absorbed).

The solvation energy is the energy involved in forming interactions between water molecules and the ions of the salt. In this case, we have: ΔHsolv = 320 kJ/mol > 0, so it is an endothermic process (the energy is absorbed).

The dissolution process involve both processes: the disruption of ion-ion interactions of the salt and the solvation process. Thus, the enthalphy change (ΔHsol) in the preparation of the solution is calculated as the addition of the lattice energy and solvation energy:

ΔHsol= ΔHlat + ΔHsolv = 350 kJ/mol + 320 kJ/mol = 370 kJ/mol

370 kJ/mol > 0 ⇒ endothermic process

Since the preparation of the solution is an endothermic process, it will absorb energy from the surroundings, so the solution would get colder.

3 0

3 years ago