Question

Which of the following is not a clue that a chemical reaction has taken place?

Changing size

changing colour

a gas being formed

formation of a precipitate​

Answer 1

Answer:

a gas being formed.........

Answer 2

Answer:

The correct answer is Changing size.

It is not a clue that a chemical reaction has taken place.

Explanation:

A change in temperature, a change in colour, the emission of gas, and the existence of an odour are four possible indicators that a chemical reaction has occurred.

• Temperature change - Usually, when a reaction occurs, heat is absorbed or released, resulting in a temperature change.
• Change in colour - When a reaction occurs, we sometimes observe a change in colour in the media.
• Emission of gas - when a reaction occurs, a gas can be released into the system. Scent or odour - when certain reactions occur, the production of certain compounds can produce a smell or odour.
• PH Variation
• Reactant dissolution
• Precipitation formation

#SPJ2