Which is not true about pH?
a. pH is representative of the concentration of hydrogen ions
b. pH can indicate the acidity or alkalinity of a substance
c. if the pH of a solution changes from 7 to 6, this indicates a 10 fold increase hydrogen
d. pH 7 is the midpoint of the scale and indicates equal amounts of hydrogen and hydroxide
e. a solution with a pH of 9 is acidic

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 does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?