How does the hydrogen concentration of a solution change when pH shifts from 6 to 2? 1. The hydrogen concentration has decreased by four times. 2. The hydrogen concentration has increased by four times. 3. The hydrogen concentration has decreased by 10,000 times. 4. The hydrogen concentration has increased by 10,000 times.

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

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration of 250 mm and a ph of 5. what concentrations of acetic acid and sodium acetate should you use