The enthalpy changes, δH , for three reactions are given. H2(g)+12o2(g)ca(s)+2h+(aq)cao(s)+2h +(aq)⟶h2o(l)⟶ca2+(aq)+h2(g)⟶ca2+(aq )+h2o(l)δH=−286 kj/molδH=−544 kj/molδH=−193 kj/mol using hess's law, calculate the heat of formation for cao(s) using the reaction shown. Ca(s)+12o2(g)⟶cao(s).

The authors use the word “backbone” in lines 3 and 39 to indicate that

Panthers and leopards prey on deer in an ecosystem. for unknown reasons, the population of leopards increased drastically. what are the likely effects of this change on the species? 1. more food for panthers and more competition for leopards 2. less food and more competition for panthers 3. fewer deer and more competition for panthers 4. more food for deer and less competition for panthers and leopards 5. more food for leopards and less competition for panthers

If the “exact” terms of the listing agreement are met, the listing broker is entitled to a commission, even if the: