8. Approximately how many hours a day are spent in school and doing homework? A. 7 hours
B. 8.5 hours
C. 9 hours
D. 8 hours

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

The mantle is made up of which structural zones?