Activity 1.3 NCERT Class 10 Science, Chemical Reactions and Equations

• Take a few zinc granules in a conical flask or a test tube.
• Add dilute hydrochloric acid or sulphuric acid to this
• (Fig. 1.2).
• CAUTION: Handle the acid with care.
• Do you observe anything happening around the zinc granules?
• Touch the conical flask or test tube. Is there any change in its temperature?

Observations:

Any of the following observations helps us to determine whether a chemical reaction has taken place –

• change in state
• change in colour
• evolution of a gas
• change in temperature.