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.

It is a chemical reaction , a chemical change.

The colourless solutions can beand .

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

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."