) none of the above 8) A balanced chemical equation used to prepare ammonium carbonate, (NH4)2CO3 .is:
2NH3.02.20 - (NH4)2003
Which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate
being formed?
A) React 2 moles NH3 . I mole CO2. and I mole H20
B) React 2 moles NH3.8 moles CO2 and 8 moles H20
React 4 moles NH3,1 mole CO2, and 2 moles H20
D) React 4 moles NH3 . 2 moles CO2 and 2 moles H20
E) none of the above

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

Compare and contrast the bohr model and the electron cloud models of the atom.

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.