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Questions and Answers
What is the purpose of adding HCl to Zn granules?
What evidence would indicate a chemical change when HCl is added to Zn granules?
What would be the expected observation after adding HCl to Zn granules?
Study Notes
Adding HCl to Zn Granules
- The purpose of adding HCl to Zn granules is to initiate a single replacement reaction, where hydrogen gas is produced, and zinc chloride is formed.
- Evidence of a chemical change includes the production of hydrogen gas, which can be identified by the presence of bubbles and a popping sound when a flame is applied.
Observations
- When HCl is added to Zn granules, the expected observation is the production of hydrogen gas, which manifests as bubbles forming on the surface of the zinc granules.
- As the reaction progresses, the zinc granules will start to dissolve, and the solution will turn cloudy or opaque due to the formation of zinc chloride.
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Description
This quiz discusses how to prove that a chemical change has occurred when dilute hydrochloric acid is added to zinc granules, with two supporting arguments. It tests your understanding of chemical reactions.
