A substance is a base if it has a pH value greater than___
PLEASE ANSWER ASAP

Which is true concerning the products and reactants of photosynthesis and cellular respiration? a. the products of photosynthesis are sugars and the reactants of cellular respiration are starches. b. the products of photosynthesis are reactants in cellular respiration. c. oxygen is needed for photosynthesis and is given off in cellular respiration.

An engineer that designs buildings is a(n) a) civil engineer b) mechanical engineer c) chemical engineer d) aerospace engineer

Select all of the atoms which bear lone electron pairs. gray = c; white = h; red = o; blue = n; dark green = cl; brown = br; light green = f; purple = i; yellow = s; orange = p. double click to select atoms.