Name the three most common states of matter on Earth. Physical properties can be divided into two categories. _______ depend on the amount of matter present, while _______ don't. Match the following properties with the best descriptions of each. a.  Physical change i.  Observable without affecting substance's composition  b.  Chemical change ii.  Must undergo a chemical reaction to observe c.  Physical property iii.  Easily reversible d.  Chemical property iv.  Can only be reversed by a chemical reaction

What area of study in chemistry is concerned with the heat transfers that occur during chemical reactions? b. thermochemistry c. calorimetry a. Stoichiometry The law of conservation of energy states that a. in any chemical or physical change, energy cannot be created or destroyed, only changed in form. b. heat changes occur during chemical and physical changes. c. energy is the capacity to do work or to supply heat d. there are two types of energy, kinetic and potential d. thermodynamics

You have a sample of a pure substance at a high temperature and high pressure. It has a density similar to its liquid phase, but it has a kinetic energy similar to its gas phase. What state of matter would best describe this substance? a. solid b. liquid c. gas d. supercritical fluid

1. When steam condenses, A. A physical change occurs. B. A chemical change occurs. C. Both physical and chemical changes occur. D. H20 molecules increase in number. E. H20 molecules decrease in number.