1. which of the following does not indicate that a chemical change may have taken place?
a. fracture formation
b. gas production
c. precipitate formation
d. energy transfer

2. what happens to matter during a chemical reaction?
a. matter is neither destroyed or created.
b. some matter is destroyed
c. some matter is created
d. some matter is destroyed and some is created.

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

What’s the scientific notation for the number 6,840,000,000

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?