How many moles are in 13 grams of NaOH

What is the mass of each element in a 324.8 sample of co2

What effect might melting sea ice have for people who live in coastal areas?

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.