Problem 33 - Chemistry Matter and Change

Question

Classify What type of reaction is most likely to occur when barium reacts with fluorine? Write the chemical equation for the reaction.

Step-by-Step Solution

Answer

The reaction is a synthesis reaction: \( \text{Ba} + \text{F}_2 \rightarrow \text{BaF}_2 \).

Step 1: Analyze the Reactants

Barium is an alkaline earth metal, and it typically reacts by losing two electrons to form a cation, Ba\(^{2+}\). Fluorine is a halogen, and it typically gains one electron to form an anion, F\(^-\).

Step 2: Determine Type of Reaction

When barium reacts with fluorine, it is an example of a synthesis or combination reaction, where two elements combine to form a compound.

Step 3: Write the Chemical Equation

The reaction between barium and fluorine can be represented by the chemical equation: \[ \text{Ba} + \text{F}_2 \rightarrow \text{BaF}_2 \]. This shows that one molecule of barium reacts with one molecule of fluorine gas to form barium fluoride.

Key Concepts

Barium Reactions

Barium is a fascinating element with the symbol Ba and atomic number 56. It is part of the alkaline earth metals group in the periodic table. Because of its position in this group, barium is characterized by its tendency to lose two electrons. This means it usually forms a positively charged ion, or cation, denoted as Ba\(^{2+}\). Alkaline earth metals, such as barium, often participate in reactions that lead to the formation of ionic compounds. Barium reactions are notable for their role in various chemical processes. For instance, barium's reaction with oxygen forms barium oxide, a well-known compound. When barium reacts with non-metals such as halogens, it typically undergoes a synthesis reaction. During these reactions, barium donates electrons to the non-metal to create a stable compound. In summary, the chemical nature of barium allows it to easily participate in synthesis reactions, particularly with halogens, to form stable ionic compounds.

Chemical Equations

Chemical equations are shorthand representations of chemical reactions. They show the reactants (starting materials) and products (substances formed) along with their respective quantities. A balanced chemical equation provides key insights into the stoichiometry of a reaction, reflecting the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction.In a chemical equation, reactants are written on the left, while products are written on the right. These are separated by an arrow (\(\rightarrow\)), which signifies the direction of the reaction. An example of a balanced chemical equation is:\[ \text{Ba} + \text{F}_2 \rightarrow \text{BaF}_2 \]This equation shows that one barium atom reacts with one molecule of fluorine gas, composed of two fluorine atoms, to produce one formula unit of barium fluoride. Coupled with subscripts and coefficients, chemical equations help track atoms and molecules through the reaction and ensure that the number of atoms for each element is conserved.

Fluorine Reactions

Fluorine, represented by the symbol F, is a highly reactive halogen. It is the most electronegative element in the periodic table, meaning it has a strong tendency to attract electrons.Due to its reactivity, fluorine readily forms compounds with many elements, especially metals, where it often gains an electron to complete its outer shell and form the anion, \(F^{-}\). As part of a synthesis reaction, fluorine can combine with a metal such as barium to form metal halides.An example of a fluorine reaction with barium is the formation of barium fluoride:\[ \text{Ba} + \text{F}_2 \rightarrow \text{BaF}_2 \]In this reaction, fluorine molecules \((\text{F}_2)\) react with barium to produce barium fluoride \((\text{BaF}_2)\). Each fluorine atom gains one electron from barium, showcasing how fluorine stabilizes by forming an ionic bond with metals during a synthesis reaction. This remarkable reactivity makes fluorine indispensable in various industrial and chemical applications.