Which statement best describes the formula equation [tex]Cl _2(g)+2 KBr ( aq ) \rightarrow 2 KCl ( aq )+ Br _2( I )[/tex] ?
A. Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine.
B. Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas.
C. Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas.
D. Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
Answer (2)
The chemical equation represents the reaction between chlorine gas and potassium bromide.
Analyze each statement to determine which accurately describes the reaction.
Statement 1 is incorrect because it mentions carbon iodide instead of chlorine.
Statement 2 describes the reverse reaction.
Statement 3 incorrectly states the phases of the reactants.
Statement 4 correctly describes the reaction: Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
The best description of the reaction is: C h l or in e g a s re a c t s w i t h p o t a ss i u m b ro mi d e t o f or m p o t a ss i u m c h l or i d e in so l u t i o n an d l i q u i d b ro min e .
Explanation
Understanding the Chemical Equation We are given a chemical equation and asked to choose the statement that best describes it. The equation is:
C l 2 ( g ) + 2 K B r ( a q ) → 2 K Cl ( a q ) + B r 2 ( I )
This equation tells us that chlorine gas ( C l 2 ) reacts with potassium bromide ( K B r ) in an aqueous solution to produce potassium chloride ( K Cl ) in an aqueous solution and liquid bromine ( B r 2 ).
Analyzing the Statements Let's analyze each statement:
Statement 1: "Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine." This is incorrect because the reactant is chlorine, not carbon iodide.
Statement 2: "Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas." This describes the reverse reaction, not the given reaction.
Statement 3: "Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas." This is incorrect because potassium bromide is in an aqueous solution, not a gas, and chlorine is a gas, not a liquid.
Statement 4: "Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine." This statement accurately describes the given chemical equation.
Conclusion Therefore, the best statement that describes the formula equation is:
Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
Examples
Understanding chemical reactions is crucial in many real-world applications. For example, in water purification, chlorine gas is used to react with and eliminate harmful bacteria and other contaminants. This process is similar to the given equation, where chlorine reacts with another substance to form different products. In the pharmaceutical industry, chemists use their knowledge of chemical reactions to synthesize new drugs and medications. Similarly, in agriculture, understanding how different chemicals react with each other helps in developing effective fertilizers and pesticides.
The correct description of the reaction represented by the equation is that chlorine gas reacts with potassium bromide to produce potassium chloride in solution and liquid bromine. The correct answer is D . This matches the provided chemical equation accurately, highlighting both reactants and products correctly.
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