Multiple Choice
What is the correct sequence of coefficients when the equation CS2(l) + O2(g) → CO2(g) + SO2(g) is balanced?
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3. Chemical Reactions
Balancing Chemical Equations
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Which of the following is the balanced chemical equation for the reaction of solid strontium with iodine gas?
A
Sr + 2I → SrI2
B
2Sr + 2I2 → 2SrI2
C
2Sr + I2 → 2SrI
D
Sr + I2 → SrI2
Verified step by step guidance1
Identify the reactants and products in the chemical reaction. Here, the reactants are solid strontium (Sr) and iodine gas (I2), and the product is strontium iodide (SrI2).
Write the unbalanced chemical equation using the chemical symbols: Sr + I2 → SrI2.
Count the number of each type of atom on both sides of the equation. On the reactant side, there is 1 Sr atom and 2 I atoms. On the product side, there is 1 Sr atom and 2 I atoms.
Check if the number of each type of atom is the same on both sides of the equation. In this case, both sides have 1 Sr atom and 2 I atoms, indicating that the equation is already balanced.
Conclude that the balanced chemical equation for the reaction of solid strontium with iodine gas is Sr + I2 → SrI2.
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