Calculate ∆Hrxn for the following reaction at 298 K using the ∆Hof values given below. 2 Na(s) + 2 H2O(l) → 2 NaOH(s) + H2(g) Given: ∆Hof (NaOH(s)) = −426.8 kJ/mol ∆Of (H2O(l)) = −285.8 kJ/mol ∆Hof (H2(g)) = 0 kJ/mole ∆Hof (Na(s)) = 0 kJ/mole

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.