Classify as element, compound, or mixture: a. Lump of copper, Cu b. gravel, and sand
c. stick of margarine (water + oil) d. lump of sugar C12, H22, O11
e. an oil slick on water f. ozone, O3

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

What is the volume in liters of 7500 g of helium atoms. assume stp conditions.