Calculate the moles of cu in 7.4×1021 atoms of cu.

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?

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.