9. The iris may dilate to make the pupil bigger or constrict to make the pupil smaller. This allows more or less light into the eye. Which of the following would cause the iris to do
this?
a. Change in pressure
b. Change in light
c. Disease in the eye

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

What is the value of the standard enthalpy of formation of an element in its most stable form?