Chemistry Problems for 9 – 21 – 16

 

Base your answers to questions 1 through 3 on the information below and on your knowledge of chemistry.

When magnesium is ignited in air, the magnesium reacts with oxygen and nitrogen.

The reaction between magnesium and nitrogen is represented by the unbalanced equation below.

Base sus respuestas a las preguntas de la 1 a la 3 en la siguiente información y su conocimiento de química.

Cuando el magnesio es encendido en el aire, el magnesio reacciona con oxígeno y nitrógeno.

La reacción entre magnesio y nitrógeno está representada por la siguiente ecuación desbalanceada.

Mg(s) + N2(g) → Mg3N2(s)

Problem 1

Balance the equation for the reaction between magnesium and nitrogen, using the smallest whole-number coefficients.

Balancee la ecuación para la reacción entre el magnesio y el nitrógeno, usando el número entero de coeficientes más pequeño.

Discussion and Solution:

On the product side, there are three magnesium atoms, hence, we need three magnesium atoms on the reactant side.

When we insert a coefficient of three for the magnesium, the equation is balanced.

3Mg(s) + N2(g) → Mg3N2(s).

 

Problem 2

In the ground state, which noble gas has atoms with the same electron configuration as a magnesium ion?

En estado fundamental, ¿cuál gas noble tiene átomos con la misma configuración de electrón que un ion de magnesio?

Discussion and Solution:

In becoming an ion, a magnesium atom takes on the same electron configuration as Ne or neon.

Problem 3

Explain, in terms of electrons, why an atom of the metal in this reaction forms an ion that has a smaller radius than its atom.

Explique, en términos de electrones, porque un átomo del metal en esta reacción forma un ion que tiene un radio más pequeño que su átomo.

Discussion and Solution:

Acceptable responses would include any of the following, but are not limited to just them:

An atom of magnesium loses its outer shell electrons to form the Mg2+ ion.

The electron configuration of a magnesium atom is 2-8-2, and the electron configuration of the magnesium ion is 2-8.

An atom of the metal loses electrons to form the ion.

Base your answers to questions 4 through 5 on the information below and on your knowledge of chemistry.

The balanced equation below represents a reaction.

Base sus respuestas a las preguntas de la 4 a la 5 en la siguiente información y su conocimiento de química.

La siguiente ecuación balanceada representa una reacción.

O2(g) + energy → O(g) + O(g)

Problem 4

Identify the type of chemical bond in a molecule of the reactant.

Identifique el tipo de enlace químico en una molécula del reactante.

Discussion and Solution:

Acceptable responses would include any of the following, but are not limited to just them:

covalent

double covalent

nonpolar

double

Problem 5

Explain, in terms of bonds, why energy is absorbed during this reaction.

Explique, en términos de enlaces, porque la energía es absorbida durante esta reacción.

Discussion and Solution:

Energy is needed to break the bonds in O2.

 

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