1. the diagram below shows a periscope. mary is using it to look over a wall.

draw the path the light ray would take through the telescope. show the direction of light rays with arrows.

During which time interval does the object travel approximately 10 meters

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

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: