Question

Perform an activity to show that a chemical reaction has taken place (evolution of a gas and change of temperature).​

Answer 1

${ \bold { \underline{\large{Activity : - }}}} \:$

Perform an activity to show that a chemical reaction has taken place (evolution of a gas and change of temperature).

${ \bold { \underline{\large{Materials \: Required : - }}}} \:$

Conical flask(250mL), cork, glass tube, zinc granules, dilute sulphuric acid.

${ \bold { \underline{\large{Procedure : - }}}} \:$

1. Set up the Apparatus as shown in figure above.

2. Remove the cork and glass tube place some dilute sulphuric acid into it.

3. Add a few small granules of zinc and immediately close the flask with the cork.

4. We observed that hydrogen gas is evolved which is indicated by the bubbles.

5. On touching the flask we find that it is hotter now than before.

${ \bold { \underline{\large{Note : - }}}} \:$ Figure of this activity is attached above.

Answer 2

Answer:

Explanation:

We are now going to look at what happens when we get chemical changes in substances. ... We can tell if a chemical reaction has taken place when one or more of the ... Usually we know a gas has formed when we can see bubbles. ... In the eggshell activity the calcium carbonate in the eggshell reacted with acetic acid .