Which part of the electromagnetic spectrum has a lower frequency than visible light?

infrared

x-rays

gamma rays

ultraviolet

What are transitions between a liquid and gas called? identify which way they are transitioning

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

How do you know when a chemical reaction has occurred