How many kilojoules of heat are released when 32.0 g of naoh are dissolved in water? (the molar heat of solution of naoh is –445.1 kj/mol.)
–556 kj
–356 kj
–142 kj
–618 kj

An engineering team designs a new rocket that is faster and lighter than any other model being produced. however, the materials end up being so expensive that no company can afford to buy them. which step of the engineering process should have addressed this problem? a. know the background. b. evaluate the results. c. identify a need. d. do the work.

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.