Grinding quartz crystals down to produce sand is an example of a
a.
change of state.
c.
chemical reaction.
b.
chemical change.
d.
physical change.

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Find the mass, in grams, of 5.00*10^23 molecules of f2