Question

Two colorless solutions are mixed together in a test tube. A student observes that a bright yellow solid collects at the bottom of the test tube. Is this is physical or chemical change? Cite evidence to support your answer.

Answer 1

It is a chemical reaction , a chemical change.

The colourless solutions can be
`KI`and
`Pb(NO_3)_2`.

When they are mixed , displacement reactiom takes place and Lead iodide is formed which is yellow in colour

Answer 2

It is a chemical change

Step-by-step explanation:

The chemicals are creating a new compound structure