How do earthquakes happen ? a. because of a release of pressure from plate movement b. only because of a volcanic eruption c. because of motion of ocean waves d. only because of a lack of pressure between plates

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

Which statement is true about ionic compounds?

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?