In physical science lab, Ben and Jerry added small pieces of magnesium to hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared. What is a sign that a chemical reaction has taken place in this experiment? A) odor B) gas is produced C) magnesium disappeared D) decrease in temperature
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B is the answer
as the reaction to took place hydrogen gas is formed as a biproduct
as the reaction to took place hydrogen gas is formed as a biproduct
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6
Answer: Option (B) is the correct answer.
Explanation:
A chemical reaction is a reaction which brings change in chemical composition of a substance.
For example, when magnesium is added to HCl then bubbles formed due to evolution of a gas.
This means a chemical change has occurred that has caused formation of gas.
Thus, we can conclude that gas is produced is a sign that a chemical reaction has taken place in the given experiment.
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