A student places a piece of a potato into a container of hydrogen peroxide. One observation the

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Label a-f based on the table using c for concentrated and d for dilute

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.