Dr. Ecksplor discovers a strangely colored orchid in Brazil. Professor Seeker find an orchid of the same color in Ecuador. The two scientist wonder whether the two flowers contain the same pigment. They feel sure that the pigment does not dissolve in water. (a) why do they feel sure that the pigment does not dissolve in water?
(b) Describe an experiment which they could do to find out whether the two orchids contain the same pigment.

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

What is the standard unit of measure for acceleration?

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?