Which of the following groups of elements are in the main group?

A. Alkali metals
B. Halogens
C. Nonmetals
D. Transition elements

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?