12. When a 120 g sample of aluminum is placed in 250 g of water the temperature increases from 25°C to 115°C. Find the energy per gram of aluminum. A. Find the percent efficiency per gram if the theoretical yield was 8500 J/g.

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland