The difference between a hypothesis and a theory is that a hypothesis is
a. never true whereas a theory is always true.
b. true whereas a theory is not true.
c. an isolated fact whereas a theory is a huge collections of facts.
d. never true whereas a theory is sometimes true.
e. an educated guess whereas a theory has been tested successfully many times in many ways.

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

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

What material does not melt at any temperature