Classify the following as element, compound, homogeneous mixture, heterogeneous mixture: aluminum. Mercury, table salt, water, brass, bronze, “moth ball”, 'gasohol', ‘dry ice’, baking soda,

vinegar, silicon chip, vitamin C, hydrogen peroxide, brewed coffee, sea water, bubbly champagne, blood, “pencil

lead”, neon gas

The clouds are grey and ground is wet. a quantitative b qualitative

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?