If two objects are the same size, but one sinks in water and one floats, which of the following statements is TRUE about the two objects?

Which of the following can be separated into its component parts by physical means?

How do chemical properties differ from physical properties?

Every sample of the sugar glucose (no matter where on Earth it comes from) consists of 8 parts (by mass) oxygen, 6 parts carbon, and 1 part hydrogen.  Based on this, how would you classify glucose? 

How many valence electrons does the following atom contain?

What is the name of our most current model of the atom?

How many protons and electrons are in an ion of suflur: S2- ?

This element gains three electrons when forming an ion; it also helps form an essential source of energy for cells.

What is the charge of an ion of gold (Au) if it has 76 electrons?

Which of the following is a physical change?