 The molecules in a test tube filled with cold water move more slowly than the molecules in a large tank of warm water. What is responsible for this difference in molecule speed?  A. Pressure  B. volume  C. weight  D. heat

 Particles that make up matter are in a state of:  A. constant motion  B. flux  C. ionization  D. constant combination

 As temperature heats up, particle motion in a solid start to:  A. slow down and pack closely together  B. speed up and start to spread out  C. motion stops altogether  D. particles move really fast and disappear

 A student lights a candle and the wax begins to melt.  Which statement describes the movement of the particles as the solid candle melts to a liquid?  A The particles move faster and farther apart.  B The particles move slower and farther apart.  C The particles move faster and closer together.  D The particles move slower and closer together

 You can always tell when particles are in a liquid because:  A. There is enough room for the particles to expand and disappear.  B. There is enough room for particles to crowd together.  C. There is enough room for particles to slide past each other.  D. There is not enough room for anything to happen.