The chemical equation shown represents photosynthesis. Carbon dioxide + A + light > B + oxygen.

What is the role of substance A in photosynthesis?

A. It stores chemical energy for plants and animals.
B. It traps light energy and converts it into chemical energy.
C. It combines with carbon dioxide and light to form glucose.
D. It combines with carbon dioxide and light to form hydrogen.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Percent ionization for a weak acid (ha) is determined by the following formula: percent ionization=[ha] ionized[ha] initial×100%for strong acids, ionization is nearly complete (100%) at most concentrations. however, for weak acids, the percent ionization changes significantly with concentration. the more diluted the acid is, the greater percent ionization. a certain weak acid, ha, has a ka value of 9.4×10? 7.part acalculate the percent ionization of ha in a 0.10 m solution. part bcalculate the percent ionization of ha in a 0.010 m solution