Are the following changes exothermic or endothermic? Explain your answer. i) 2Al(s) + Fe2O2(s) = Al2O3(s) + 2Fe(s)
ii) HCl(aq) + NaOH(aq) = NaCl(aq) + H2O(l)
iii) H2O(s) = H2O(l)

Which of the following is most likely true about water in chemical solutions?

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.

The molar mass of iron(fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?