If molten sodium chloride is split by electrolysis, which reaction occurs at the anode? 2Cl2 (g) →2Cl− (l) + 2e−

2Cl− (l) →Cl2 (g) + 2e−

2Na (l) →2Na+ (l) + 2e−

2Na+ (l) + 2e−→2Na (l)

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains