When vapors of a flammable or combustible liquid are mixed with air in the proportions in the presence of a source of ignition, rapid combustion or an explosion can occur. the proper proportion is called the a. boiling range b. flammable or explosive range c. flash point

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Classify this reaction: 2al+n2-> aln.

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of