What’s the answer ?For edge

Classify each statement about effective nuclear charge, zeff, as true or false.

Describe the interaction that occurs between two objects with the same electrical charge.

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.