Phosphoric acid can be prepared by the reaction of P4O10 with water as given by the following balanced chemical equation. P4O10(s) + 6H2O(l) → 4H3PO4(aq) When 25.8 g of H3PO4 (98.0 g/mol) is produced, 10.9 kJ of heat is evolved. Calculate ΔH for the overall reaction.

How does chemistry affect our world? a. chemicals makes our world more polluted. b. chemicals keeps us healthy. c. chemicals can or hurt our world. d. chemicals make our world safe to live in.

(1.6 × 10-19)(5.0 × 106) = c × 10d identify the missing numbers below to show the result of multiplying the numbers.

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean