Questions: What type of chemical reaction is illustrated in the following example? Zn(s) + HCl(aq) -> ZnCl2(aq) + H2(g) A) combination reaction B) decomposition reaction C) single-replacement reaction D) double-replacement reaction What is the predicted product from the following combination reaction? Sr(s) + Br2(l) A) SrBr B) Sr2Br C) SrBr2 D) Sr2Br3

What type of chemical reaction is illustrated in the following example? Zn(s) + HCl(aq) -> ZnCl2(aq) + H2(g) A) combination reaction B) decomposition reaction C) single-replacement reaction D) double-replacement reaction What is the predicted product from the following combination reaction? Sr(s) + Br2(l) A) SrBr B) Sr2Br C) SrBr2 D) Sr2Br3
Transcript text: 21 Multiple Choice 1.5 points What type of chemical reaction is illustrated in the following example? \[ \mathrm{Zn}(s)+\mathrm{HCl}(a q) \rightarrow \mathrm{ZnCl}_{2}(a q)+\mathrm{H}_{2}(g) \] A) combination reaction B) decomposition reaction C) single-replacement reaction D) double-replacement reaction 22 Multiple Choice 1.5 points What is the predicted product from the following combination reaction? \[ \mathrm{Sr}(s)+\mathrm{Br} 2(l) \] A) SrBr B) $\mathrm{Sr}_{2} \mathrm{Br}$ C) $\mathrm{SrBr}_{2}$ D) $\mathrm{Sr}_{2} \mathrm{Br}_{3}$
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Solution

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Solution Steps

Step 1: Identify the Type of Reaction
  • Examine the given chemical equation: \(\mathrm{Zn}(s) + \mathrm{HCl}(aq) \rightarrow \mathrm{ZnCl}_{2}(aq) + \mathrm{H}_{2}(g)\).
  • Recognize that zinc (\(\mathrm{Zn}\)) is replacing hydrogen (\(\mathrm{H}\)) in hydrochloric acid (\(\mathrm{HCl}\)).
  • This is characteristic of a single-replacement reaction, where one element replaces another in a compound.
Step 2: Predict the Product of a Combination Reaction
  • Analyze the given reactants: \(\mathrm{Sr}(s) + \mathrm{Br}_{2}(l)\).
  • In a combination reaction, two or more substances combine to form a single product.
  • Strontium (\(\mathrm{Sr}\)) and bromine (\(\mathrm{Br}_{2}\)) will combine to form strontium bromide.
  • The correct chemical formula for strontium bromide, considering the charges of \(\mathrm{Sr}^{2+}\) and \(\mathrm{Br}^{-}\), is \(\mathrm{SrBr}_{2}\).
Step 3: Choose the Correct Answer for Each Question
  • For the first question, the correct answer is C) single-replacement reaction.
  • For the second question, the correct answer is B) \(\mathrm{SrBr}_{2}\).

Final Answer

For question 21: The correct answer is C) single-replacement reaction.
For question 22: The correct answer is B) \(\mathrm{SrBr}_{2}\).

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