by giving at least two eg describe evolution of gas in a chemical reaction?
Answers
Answer:
Have you ever had an upset stomach, or indigestion? One cure for indigestion is Alka-Seltzer, an over the counter medication that helps to settle the stomach. When you drop an Alka-Seltzer tablet into water, it immediately starts to bubble and fizz. Why does this happen? What you're observing when you make an Alka-Seltzer drink is an example of a gas evolution reaction. In this type of chemical reaction one of the products is a gas, which can be seen as bubbles in an aqueous solution.
Gas evolution reactions are one example of double displacement reactions, where two ionic compounds mix. The negatively charged ions, or anions, essentially switch partners, forming new chemical compounds in the product. To picture this, imagine having two Lego structures, each made of two colors. During the reaction, you take one color from each structure and swap it out to the other one. This is how a double displacement reaction works.
Answer:
What you're observing when you make an Alka-Seltzer drink is an example of a gas evolution reaction.